├── imgui.ini
├── src
    ├── parser
    │   ├── operator.h
    │   ├── operator.cpp
    │   ├── modulator.h
    │   ├── equation.h
    │   ├── unit.h
    │   ├── modulator.cpp
    │   ├── equation.cpp
    │   └── unit.cpp
    ├── renderer
    │   ├── shader.h
    │   ├── grid.h
    │   ├── line.h
    │   ├── imgui
    │   │   ├── LICENSE.txt
    │   │   ├── imgui_impl_sdl.h
    │   │   ├── imgui_impl_opengl3.h
    │   │   ├── imconfig.h
    │   │   ├── imgui_impl_sdl.cpp
    │   │   ├── imstb_rectpack.h
    │   │   └── imgui_impl_opengl3.cpp
    │   ├── line.cpp
    │   ├── renderer.h
    │   ├── shader.cpp
    │   ├── grid.cpp
    │   └── renderer.cpp
    └── main.cpp
├── .gitignore
├── makefile
├── README.md
└── LICENSE


/imgui.ini:
--------------------------------------------------------------------------------
 1 | [Window][Debug##Default]
 2 | Pos=60,60
 3 | Size=400,400
 4 | Collapsed=0
 5 | 
 6 | [Window][Grapher]
 7 | Pos=4,7
 8 | Size=309,302
 9 | Collapsed=0
10 | 
11 | 


--------------------------------------------------------------------------------
/src/parser/operator.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | class Operator {
 4 | public:
 5 |   Operator(char c);
 6 |   ~Operator();
 7 | 
 8 |   // get the type of the operator
 9 |   char getOp() { return op; }
10 | 
11 |   // evaluate an operator expression
12 |   double evalOp(double lhs, double rhs);
13 | 
14 | private:
15 |   // operator type
16 |   char op;
17 | };
18 | 


--------------------------------------------------------------------------------
/src/renderer/shader.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <GL/glew.h>
 4 | 
 5 | class Shader {
 6 | public:
 7 |   Shader();
 8 |   ~Shader();
 9 | 
10 |   void useProgram();
11 |   void setUniform3f(const char *name, float one, float two, float three);
12 |   void setUniform1f(const char *name, float val);
13 | 
14 | private:
15 |   GLuint shaderProgram;
16 | };
17 | 


--------------------------------------------------------------------------------
/src/renderer/grid.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include "line.h"
 4 | #include "shader.h"
 5 | 
 6 | class Grid {
 7 | public:
 8 |   Grid();
 9 |   ~Grid();
10 | 
11 |   void updateGrid(double xOffset, double yOffset, double scale);
12 |   void renderGrid(Shader *s);
13 | 
14 | private:
15 |   std::vector<Line *> vertLines;
16 |   std::vector<Line *> horizLines;
17 |   Line *yAxis;
18 |   Line *xAxis;
19 |   bool xAct, yAct;
20 | };
21 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # Prerequisites
 2 | *.d
 3 | 
 4 | # Compiled Object files
 5 | *.slo
 6 | *.lo
 7 | *.o
 8 | *.obj
 9 | 
10 | # Precompiled Headers
11 | *.gch
12 | *.pch
13 | 
14 | # Compiled Dynamic libraries
15 | *.so
16 | *.dylib
17 | *.dll
18 | 
19 | # Fortran module files
20 | *.mod
21 | *.smod
22 | 
23 | # Compiled Static libraries
24 | *.lai
25 | *.la
26 | *.a
27 | *.lib
28 | 
29 | # Executables
30 | *.exe
31 | *.out
32 | *.app
33 | glGraph
34 | 
35 | #ide stuff
36 | .vscode
37 | vgcore.*
38 | *.swp
39 | 


--------------------------------------------------------------------------------
/src/parser/operator.cpp:
--------------------------------------------------------------------------------
 1 | #include "operator.h"
 2 | 
 3 | #include <cmath>
 4 | 
 5 | Operator::Operator(char c) { op = c; }
 6 | 
 7 | Operator::~Operator() {}
 8 | 
 9 | // evaluate the operator
10 | double Operator::evalOp(double lhs, double rhs) {
11 |   switch (op) {
12 |   case '+':
13 |     return lhs + rhs;
14 |   case '-':
15 |     return lhs - rhs;
16 |   case '/':
17 |     return lhs / rhs;
18 |   case '*':
19 |     return lhs * rhs;
20 |   case '^':
21 |     return std::pow(lhs, rhs);
22 |   default:
23 |     return lhs + rhs;
24 |   }
25 | }
26 | 


--------------------------------------------------------------------------------
/makefile:
--------------------------------------------------------------------------------
 1 | PNAME := glGraph
 2 | 
 3 | PCXXSRC := $(wildcard src/*.cpp)
 4 | PCXXSRC += $(wildcard src/parser/*.cpp)
 5 | PCXXSRC += $(wildcard src/renderer/*.cpp)
 6 | PCXXSRC += $(wildcard src/renderer/imgui/*.cpp)
 7 | 
 8 | POBJS := $(PCXXSRC:.cpp=.o)
 9 | 
10 | CXXFLAGS += -std=c++17
11 | 
12 | LDLIBS += -lSDL2 -lGLEW -lGL
13 | 
14 | .SILENT: all $(POBJS)
15 | .PHONY: all
16 | 
17 | all: $(PNAME)
18 | 
19 | $(PNAME): $(POBJS)
20 | 	@-$(LINK.cc) $(POBJS) -o $(PNAME) $(LDLIBS)
21 | 	@-$(RM) $(POBJS)
22 | 
23 | clean:
24 | 	@- $(RM) $(PNAME)
25 | 	@- $(RM) $(POBJS)
26 | 


--------------------------------------------------------------------------------
/src/parser/modulator.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <iostream>
 4 | 
 5 | enum class mod { NONE = 0, SIN = 1, COS = 2, TAN = 3, SQRT = 4 };
 6 | 
 7 | class Modulator {
 8 | public:
 9 |   Modulator();
10 |   ~Modulator();
11 | 
12 |   // get and set type
13 |   mod getM() const { return m; }
14 |   void setM(mod modulator) { m = modulator; }
15 | 
16 |   // apply the function
17 |   double applyMod(double x);
18 | 
19 |   // allow printing of the modulator (mostly for debug purposes)
20 |   friend std::ostream &operator<<(std::ostream &os, const Modulator &m);
21 | 
22 | private:
23 |   // type of modulator
24 |   mod m;
25 | };
26 | 


--------------------------------------------------------------------------------
/src/renderer/line.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <GL/glew.h>
 4 | 
 5 | #include <vector>
 6 | 
 7 | class Line {
 8 | public:
 9 |   Line(std::vector<double> verts);
10 |   Line(double *verts, int numVerts);
11 |   ~Line();
12 | 
13 |   void draw();
14 | 
15 |   float getColorR() { return color[0]; }
16 |   float getColorG() { return color[1]; }
17 |   float getColorB() { return color[2]; }
18 | 
19 |   void setColor(float r, float g, float b);
20 | 
21 |   bool isSelected() { return selected; }
22 |   void setSelected(bool val) { selected = val; }
23 | 
24 | private:
25 |   void init();
26 | 
27 |   GLuint VAO, VBO;
28 |   std::vector<double> vertices;
29 |   float color[3];
30 |   bool selected;
31 | };
32 | 


--------------------------------------------------------------------------------
/src/parser/equation.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <map>
 4 | #include <string>
 5 | 
 6 | #include "unit.h"
 7 | 
 8 | class Equation {
 9 | public:
10 |   Equation(std::string eq);
11 |   ~Equation();
12 | 
13 |   // evaluate at a single x-value
14 |   double evalAtX(double x, bool useDeg);
15 | 
16 |   // evaluate over a range of x-values
17 |   std::map<double, double> exportRange(double xPos, double dist,
18 |                                        double resolution, bool scaleRes,
19 |                                        bool useDeg);
20 | 
21 | private:
22 |   std::string origEq;
23 |   Unit *baseUnit;
24 | 
25 |   std::string processEq(std::string eq);
26 | 
27 |   bool isModStart(char c);
28 |   bool isModulator(std::string t);
29 |   bool isOperator(char c);
30 | };
31 | 


--------------------------------------------------------------------------------
/src/parser/unit.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <string>
 4 | #include <utility>
 5 | #include <variant>
 6 | #include <vector>
 7 | 
 8 | #include "modulator.h"
 9 | #include "operator.h"
10 | 
11 | class Unit {
12 | public:
13 |   Unit(std::string eq);
14 |   ~Unit();
15 | 
16 |   // evaluate the unit at an x-value
17 |   // and choose whether or not to use degrees (for trigonometric functions)
18 |   double evalUnit(double x, bool useDeg);
19 | 
20 |   std::string getEqStr() { return eqStr; }
21 | 
22 | private:
23 |   std::string eqStr;
24 |   bool hasVar;
25 |   double noVarValDeg;
26 |   double noVarValRad;
27 | 
28 |   bool modExp;
29 |   Modulator m;
30 |   std::pair<Modulator, Unit *> modUnit;
31 | 
32 |   bool isOperator(char c);
33 |   std::vector<std::variant<double, Operator, Unit>> exp;
34 | 
35 |   // evaluate operator expressions
36 |   double evalOps(std::vector<std::variant<double, Operator>> opVec);
37 | };
38 | 


--------------------------------------------------------------------------------
/src/parser/modulator.cpp:
--------------------------------------------------------------------------------
 1 | #include "modulator.h"
 2 | 
 3 | #include <cmath>
 4 | #include <string>
 5 | 
 6 | Modulator::Modulator() { m = mod::NONE; }
 7 | 
 8 | Modulator::~Modulator(){};
 9 | 
10 | // apply the function
11 | double Modulator::applyMod(double x) {
12 |   switch (m) {
13 |   case mod::SIN:
14 |     return std::sin(x);
15 |   case mod::COS:
16 |     return std::cos(x);
17 |   case mod::TAN:
18 |     return std::tan(x);
19 |   case mod::SQRT:
20 |     return std::sqrt(x);
21 |   case mod::NONE:
22 |     return x;
23 |   default:
24 |     return x;
25 |   }
26 | }
27 | 
28 | // print the modulator type (used for debug)
29 | std::ostream &operator<<(std::ostream &os, const Modulator &m) {
30 |   std::string ret = "";
31 |   switch (m.getM()) {
32 |   case mod::SIN:
33 |     ret = "sin";
34 |     break;
35 |   case mod::COS:
36 |     ret = "cos";
37 |     break;
38 |   case mod::TAN:
39 |     ret = "tan";
40 |     break;
41 |   case mod::SQRT:
42 |     ret = "sqrt";
43 |     break;
44 |   case mod::NONE:
45 |     break;
46 |   default:
47 |     break;
48 |   }
49 |   return os << ret;
50 | }
51 | 


--------------------------------------------------------------------------------
/src/renderer/imgui/LICENSE.txt:
--------------------------------------------------------------------------------
 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2014-2021 Omar Cornut
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/src/renderer/line.cpp:
--------------------------------------------------------------------------------
 1 | #include "line.h"
 2 | 
 3 | #include <iostream>
 4 | 
 5 | Line::Line(std::vector<double> verts) {
 6 |   vertices = verts;
 7 |   init();
 8 | }
 9 | 
10 | Line::Line(double *verts, int numVerts) {
11 |   for (int i = 0; i < numVerts; i++) {
12 |     vertices.push_back(verts[i]);
13 |   }
14 |   init();
15 | }
16 | 
17 | void Line::init() {
18 |   color[0] = 1.0f;
19 |   color[1] = 0.0f;
20 |   color[2] = 0.0f;
21 | 
22 |   selected = false;
23 |   glGenVertexArrays(1, &VAO);
24 |   glGenBuffers(1, &VBO);
25 |   glBindVertexArray(VAO);
26 |   glBindBuffer(GL_ARRAY_BUFFER, VBO);
27 |   glVertexAttribPointer(0, 3, GL_DOUBLE, GL_FALSE, 0, (void *)0);
28 |   glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(double),
29 |                vertices.data(), GL_DYNAMIC_DRAW);
30 |   glEnableVertexAttribArray(0);
31 | }
32 | 
33 | Line::~Line() {
34 |   glDeleteVertexArrays(1, &VAO);
35 |   glDeleteBuffers(1, &VBO);
36 | }
37 | 
38 | void Line::draw() {
39 |   glBindVertexArray(VAO);
40 |   glDrawArrays(GL_LINE_STRIP, 0, vertices.size() / 3);
41 | }
42 | 
43 | void Line::setColor(float r, float g, float b) {
44 |   color[0] = r;
45 |   color[1] = g;
46 |   color[2] = b;
47 | }
48 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # glGraph
 2 | 
 3 | A 2d Graphing Calculator using Modern OpenGL
 4 | 
 5 | ## Demo
 6 | https://user-images.githubusercontent.com/5031736/122145371-1c5d8400-ce23-11eb-9e6e-e537469c06df.mp4
 7 | 
 8 | ## Information
 9 | 
10 | - This has only been tested on Fedora 34, it should work on other OS's but I make no guarantees.  
11 | - This uses C++17 features.
12 | - Controls: WASD to move around, QE to zoom
13 | 
14 | ## What can it do so far?
15 | 
16 | - Basic operations (+, -, *, /, ^)
17 | - Order of operations (parentheses, etc)
18 | - Functions: sin, cos, tan, sqrt
19 | - Switch between radians and degrees
20 | - Multiple lines, ability to change line color, and ability to remove lines
21 | - Live equation updating (not shown in example)
22 | 
23 | ## Known issues
24 | 
25 | - floating point precision errors
26 | - functions with undefined values (e.g. divides by 0 or goes to infinity) sometimes display strange behavior
27 | - glLineWidth may not work on some (maybe all) versions of macOS because of limited GL_LINE_WIDTH_RANGE  
28 | - invalid character sequences may cause program to crash
29 | 
30 | ## Dependencies  
31 | 
32 | - OpenGL 3.3 core
33 | - SDL2
34 | - GLEW
35 | - Dear ImGui  
36 | 


--------------------------------------------------------------------------------
/src/renderer/renderer.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <GL/glew.h>
 4 | 
 5 | #define SDL_MAIN_HANDLED
 6 | #include <SDL2/SDL.h>
 7 | #include <map>
 8 | #include <string>
 9 | #include <vector>
10 | 
11 | #include "imgui/imgui.h"
12 | #include "imgui/imgui_impl_opengl3.h"
13 | #include "imgui/imgui_impl_sdl.h"
14 | 
15 | #include "grid.h"
16 | #include "line.h"
17 | #include "shader.h"
18 | 
19 | class Renderer {
20 | public:
21 |   Renderer();
22 |   ~Renderer();
23 | 
24 |   bool isRunning() { return running; }
25 | 
26 |   void clear();
27 |   void update(double *xPos, double *scale, std::vector<std::string> *equs,
28 |               double *resolution, bool *scaleRes, bool *updateEq,
29 |               bool *updatePos, bool *useDeg);
30 | 
31 |   void graphPoint(double x, double y);
32 |   void graphLine(std::map<double, double> points, int index, double scale);
33 | 
34 | private:
35 |   bool running;
36 |   int screenWidth = 1024;
37 |   int screenHeight = 600;
38 | 
39 |   bool eqUpdate;
40 |   std::vector<char *> eqBuf;
41 | 
42 |   double yOffset;
43 |   double xOffset;
44 | 
45 |   int mouseX, mouseY;
46 |   bool showMouse;
47 | 
48 |   SDL_Window *gWindow;
49 |   SDL_GLContext gContext;
50 | 
51 |   Shader *s;
52 |   std::vector<Line *> lines;
53 |   bool lineAct;
54 |   int numLines;
55 |   float newColor[3];
56 |   int lInd;
57 |   int currSel;
58 | 
59 |   Grid *g;
60 | };
61 | 


--------------------------------------------------------------------------------
/src/renderer/imgui/imgui_impl_sdl.h:
--------------------------------------------------------------------------------
 1 | // dear imgui: Platform Backend for SDL2
 2 | // This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
 3 | // (Info: SDL2 is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc.)
 4 | 
 5 | // Implemented features:
 6 | //  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
 7 | //  [X] Platform: Clipboard support.
 8 | //  [X] Platform: Keyboard arrays indexed using SDL_SCANCODE_* codes, e.g. ImGui::IsKeyPressed(SDL_SCANCODE_SPACE).
 9 | //  [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
10 | // Missing features:
11 | //  [ ] Platform: SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME.
12 | 
13 | // You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
14 | // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
15 | // Read online: https://github.com/ocornut/imgui/tree/master/docs
16 | 
17 | #pragma once
18 | #include "imgui.h"      // IMGUI_IMPL_API
19 | 
20 | struct SDL_Window;
21 | typedef union SDL_Event SDL_Event;
22 | 
23 | IMGUI_IMPL_API bool     ImGui_ImplSDL2_InitForOpenGL(SDL_Window* window, void* sdl_gl_context);
24 | IMGUI_IMPL_API bool     ImGui_ImplSDL2_InitForVulkan(SDL_Window* window);
25 | IMGUI_IMPL_API bool     ImGui_ImplSDL2_InitForD3D(SDL_Window* window);
26 | IMGUI_IMPL_API bool     ImGui_ImplSDL2_InitForMetal(SDL_Window* window);
27 | IMGUI_IMPL_API void     ImGui_ImplSDL2_Shutdown();
28 | IMGUI_IMPL_API void     ImGui_ImplSDL2_NewFrame(SDL_Window* window);
29 | IMGUI_IMPL_API bool     ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event);
30 | 


--------------------------------------------------------------------------------
/src/main.cpp:
--------------------------------------------------------------------------------
 1 | #include <iostream>
 2 | 
 3 | #include "parser/equation.h"
 4 | #include "renderer/renderer.h"
 5 | 
 6 | int main(int argc, char *argv[]) {
 7 | 
 8 |   std::vector<std::string> currEqs = {""};
 9 |   std::vector<Equation *> eqs = {new Equation("")};
10 |   Renderer r;
11 | 
12 |   // viewport controls
13 |   double xPos = 0.0f;
14 |   double resolution = 0.1f;
15 |   double scale = 1.0f;
16 |   bool scaleRes = true;
17 | 
18 |   // misc calculator controls
19 |   bool useDeg = false;
20 | 
21 |   while (r.isRunning()) {
22 |     r.clear();
23 | 
24 |     bool updateEq = false;
25 |     bool updatePos = false;
26 | 
27 |     r.update(&xPos, &scale, &currEqs, &resolution, &scaleRes, &updateEq,
28 |              &updatePos, &useDeg);
29 | 
30 |     // update changed equations
31 |     if (updateEq) {
32 |       for (int i = 0; i < std::min(currEqs.size(), eqs.size()); i++) {
33 |         delete eqs.at(i);
34 |         eqs.at(i) = new Equation(currEqs.at(i));
35 |       }
36 |       // if an equation should be removed, remove it
37 |       if (currEqs.size() < eqs.size()) {
38 |         delete eqs.at(eqs.size() - 1);
39 |         eqs.erase(eqs.end() - 1);
40 |       }
41 |       // if an equation should be added, add it
42 |       if (currEqs.size() > eqs.size()) {
43 |         eqs.push_back(new Equation(currEqs.at(currEqs.size() - 1)));
44 |       }
45 |     }
46 | 
47 |     // redraw the equations when the camera position updates
48 |     if (updatePos) {
49 |       int index = 0;
50 |       for (auto s : currEqs) {
51 |         if (s != "") {
52 |           std::map<double, double> map = eqs.at(index)->exportRange(
53 |               xPos, scale, resolution, scaleRes, useDeg);
54 |           r.graphLine(map, index, scale);
55 |           /*for (auto [x, y] : map) {
56 |             std::cout << "x=" << x << " "
57 |                       << "y=" << y << std::endl;
58 |           }*/
59 |         }
60 |         index++;
61 |       }
62 |     }
63 |   }
64 | 
65 |   for (int i = 0; i < eqs.size(); i++)
66 |     delete eqs.at(i);
67 | 
68 |   return 0;
69 | }
70 | 


--------------------------------------------------------------------------------
/src/renderer/shader.cpp:
--------------------------------------------------------------------------------
 1 | #include "shader.h"
 2 | 
 3 | #include <iostream>
 4 | 
 5 | Shader::Shader() {
 6 |   const char *vertSrc = R""(
 7 |         #version 330 core
 8 |         in vec3 fPos;
 9 |         void main(){
10 |             gl_Position = vec4(fPos, 1.0);
11 |         }
12 |     )"";
13 | 
14 |   const char *fragSrc = R""(
15 |         #version 330 core
16 |         out vec4 outColor;
17 | 	uniform vec3 color;
18 | 	uniform float opacity;
19 |         void main(){
20 |             outColor = vec4(color, opacity);
21 |         }
22 |     )"";
23 | 
24 |   int success;
25 |   char infoLog[512];
26 | 
27 |   GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
28 |   glShaderSource(vertexShader, 1, &vertSrc, NULL);
29 |   glCompileShader(vertexShader);
30 |   glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
31 |   if (!success) {
32 |     glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
33 |     std::cout << "Vertex: " << infoLog << std::endl;
34 |   }
35 | 
36 |   GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
37 |   glShaderSource(fragmentShader, 1, &fragSrc, NULL);
38 |   glCompileShader(fragmentShader);
39 |   glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
40 |   if (!success) {
41 |     glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
42 |     std::cout << "Fragment: " << infoLog << std::endl;
43 |   }
44 | 
45 |   shaderProgram = glCreateProgram();
46 |   glAttachShader(shaderProgram, vertexShader);
47 |   glAttachShader(shaderProgram, fragmentShader);
48 |   glLinkProgram(shaderProgram);
49 |   glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
50 |   if (!success) {
51 |     glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
52 |     std::cout << "Program: " << infoLog << std::endl;
53 |   }
54 | 
55 |   glDeleteShader(vertexShader);
56 |   glDeleteShader(fragmentShader);
57 | }
58 | 
59 | Shader::~Shader() { glDeleteProgram(shaderProgram); }
60 | 
61 | void Shader::useProgram() { glUseProgram(shaderProgram); }
62 | 
63 | void Shader::setUniform3f(const char *name, float one, float two, float three) {
64 |   GLuint loc = glGetUniformLocation(shaderProgram, name);
65 |   glUniform3f(loc, one, two, three);
66 | }
67 | 
68 | void Shader::setUniform1f(const char *name, float val) {
69 |   GLuint loc = glGetUniformLocation(shaderProgram, name);
70 |   glUniform1f(loc, val);
71 | }
72 | 


--------------------------------------------------------------------------------
/src/renderer/grid.cpp:
--------------------------------------------------------------------------------
 1 | #include "grid.h"
 2 | 
 3 | #include <cmath>
 4 | #include <iostream>
 5 | 
 6 | Grid::Grid() {
 7 |   xAct = false;
 8 |   yAct = false;
 9 |   updateGrid(0.0f, 0.0f, 1.0f);
10 | }
11 | 
12 | Grid::~Grid() {
13 |   delete yAxis;
14 |   delete xAxis;
15 |   for (int i = 0; i < horizLines.size(); i++) {
16 |     delete horizLines.at(i);
17 |   }
18 |   for (int i = 0; i < vertLines.size(); i++) {
19 |     delete vertLines.at(i);
20 |   }
21 | }
22 | 
23 | void Grid::updateGrid(double xOffset, double yOffset, double scale) {
24 |   for (int i = 0; i < horizLines.size(); i++) {
25 |     delete horizLines.at(i);
26 |   }
27 |   horizLines.clear();
28 |   for (float i = yOffset; i <= scale + yOffset; i += 1.0f / scale) {
29 |     std::vector<double> tVerts = {-1.0f, i, 0.0f, 1.0f, i, 0.0f};
30 |     horizLines.push_back(new Line(tVerts));
31 |   }
32 | 
33 |   for (float i = yOffset; i >= -1.0f * scale + yOffset; i -= 1.0f / scale) {
34 |     std::vector<double> tVerts = {-1.0f, i, 0.0f, 1.0f, i, 0.0f};
35 |     horizLines.push_back(new Line(tVerts));
36 |   }
37 | 
38 |   if (xAct)
39 |     delete xAxis;
40 |   double x = (0.0f + xOffset) / scale;
41 |   double v[] = {x, 1.0f, 0.0f, x, -1.0f, 0.0f};
42 |   xAxis = new Line(v, 6);
43 |   xAct = true;
44 | 
45 |   for (int i = 0; i < vertLines.size(); i++) {
46 |     delete vertLines.at(i);
47 |   }
48 |   vertLines.clear();
49 | 
50 |   for (float i = xOffset / scale; i <= scale + xOffset; i += 1.0f / scale) {
51 |     std::vector<double> tVerts = {i, -1.0f, 0.0f, i, 1.0f, 0.0f};
52 |     vertLines.push_back(new Line(tVerts));
53 |   }
54 |   for (float i = xOffset / scale; i >= -1.0 * scale + xOffset;
55 |        i -= 1.0f / scale) {
56 |     std::vector<double> tVerts = {i, -1.0f, 0.0f, i, 1.0f, 0.0f};
57 |     vertLines.push_back(new Line(tVerts));
58 |   }
59 | 
60 |   if (yAct)
61 |     delete yAxis;
62 |   double y = (0.0f + yOffset);
63 |   double vy[] = {-1.0f, y, 0.0f, 1.0f, y, 0.0f};
64 |   yAxis = new Line(vy, 6);
65 |   yAct = true;
66 | }
67 | 
68 | void Grid::renderGrid(Shader *s) {
69 |   s->setUniform3f("color", 0.5f, 0.5f, 0.5f);
70 |   glLineWidth(1.0f);
71 |   for (auto l : vertLines) {
72 |     l->draw();
73 |   }
74 |   for (auto l : horizLines) {
75 |     l->draw();
76 |   }
77 | 
78 |   glLineWidth(4.0f);
79 |   s->setUniform3f("color", 0.0f, 0.0f, 0.0f);
80 |   yAxis->draw();
81 |   xAxis->draw();
82 | }
83 | 


--------------------------------------------------------------------------------
/src/renderer/imgui/imgui_impl_opengl3.h:
--------------------------------------------------------------------------------
 1 | // dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline
 2 | // - Desktop GL: 2.x 3.x 4.x
 3 | // - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
 4 | // This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
 5 | 
 6 | // Implemented features:
 7 | //  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
 8 | //  [x] Renderer: Desktop GL only: Support for large meshes (64k+ vertices) with 16-bit indices.
 9 | 
10 | // You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
11 | // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
12 | // Read online: https://github.com/ocornut/imgui/tree/master/docs
13 | 
14 | // About Desktop OpenGL function loaders:
15 | //  Modern Desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
16 | //  Helper libraries are often used for this purpose! Here we are supporting a few common ones (gl3w, glew, glad).
17 | //  You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
18 | 
19 | // About GLSL version:
20 | //  The 'glsl_version' initialization parameter should be NULL (default) or a "#version XXX" string.
21 | //  On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es"
22 | //  Only override if your GL version doesn't handle this GLSL version. See GLSL version table at the top of imgui_impl_opengl3.cpp.
23 | 
24 | #pragma once
25 | #include "imgui.h"      // IMGUI_IMPL_API
26 | 
27 | // Backend API
28 | IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = NULL);
29 | IMGUI_IMPL_API void     ImGui_ImplOpenGL3_Shutdown();
30 | IMGUI_IMPL_API void     ImGui_ImplOpenGL3_NewFrame();
31 | IMGUI_IMPL_API void     ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data);
32 | 
33 | // (Optional) Called by Init/NewFrame/Shutdown
34 | IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateFontsTexture();
35 | IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyFontsTexture();
36 | IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateDeviceObjects();
37 | IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyDeviceObjects();
38 | 
39 | // Specific OpenGL ES versions
40 | //#define IMGUI_IMPL_OPENGL_ES2     // Auto-detected on Emscripten
41 | //#define IMGUI_IMPL_OPENGL_ES3     // Auto-detected on iOS/Android
42 | 
43 | // Attempt to auto-detect the default Desktop GL loader based on available header files.
44 | // If auto-detection fails or doesn't select the same GL loader file as used by your application,
45 | // you are likely to get a crash in ImGui_ImplOpenGL3_Init().
46 | // You can explicitly select a loader by using one of the '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
47 | #if !defined(IMGUI_IMPL_OPENGL_ES2) \
48 |  && !defined(IMGUI_IMPL_OPENGL_ES3) \
49 |  && !defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) \
50 |  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLEW) \
51 |  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD) \
52 |  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2) \
53 |  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2) \
54 |  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3) \
55 |  && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
56 | 
57 | // Try to detect GLES on matching platforms
58 | #if defined(__APPLE__)
59 | #include "TargetConditionals.h"
60 | #endif
61 | #if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) || (defined(__ANDROID__))
62 | #define IMGUI_IMPL_OPENGL_ES3               // iOS, Android  -> GL ES 3, "#version 300 es"
63 | #elif defined(__EMSCRIPTEN__)
64 | #define IMGUI_IMPL_OPENGL_ES2               // Emscripten    -> GL ES 2, "#version 100"
65 | 
66 | // Otherwise try to detect supported Desktop OpenGL loaders..
67 | #elif defined(__has_include)
68 | #if __has_include(<GL/glew.h>)
69 |     #define IMGUI_IMPL_OPENGL_LOADER_GLEW
70 | #elif __has_include(<glad/glad.h>)
71 |     #define IMGUI_IMPL_OPENGL_LOADER_GLAD
72 | #elif __has_include(<glad/gl.h>)
73 |     #define IMGUI_IMPL_OPENGL_LOADER_GLAD2
74 | #elif __has_include(<GL/gl3w.h>)
75 |     #define IMGUI_IMPL_OPENGL_LOADER_GL3W
76 | #elif __has_include(<glbinding/glbinding.h>)
77 |     #define IMGUI_IMPL_OPENGL_LOADER_GLBINDING3
78 | #elif __has_include(<glbinding/Binding.h>)
79 |     #define IMGUI_IMPL_OPENGL_LOADER_GLBINDING2
80 | #else
81 |     #error "Cannot detect OpenGL loader!"
82 | #endif
83 | #else
84 |     #define IMGUI_IMPL_OPENGL_LOADER_GL3W   // Default to GL3W embedded in our repository
85 | #endif
86 | 
87 | #endif
88 | 


--------------------------------------------------------------------------------
/src/parser/equation.cpp:
--------------------------------------------------------------------------------
  1 | #include "equation.h"
  2 | 
  3 | #include <algorithm>
  4 | #include <cmath>
  5 | #include <iostream>
  6 | 
  7 | Equation::Equation(std::string eq) {
  8 |   // std::cout << "Original: " << eq << std::endl;
  9 |   origEq = processEq(eq);
 10 |   // std::cout << "Processed: " << origEq << std::endl;
 11 | 
 12 |   baseUnit = new Unit(origEq);
 13 | }
 14 | 
 15 | Equation::~Equation() { delete baseUnit; }
 16 | 
 17 | // is the char the start of a function (sqrt, sin, cos, tan)
 18 | bool Equation::isModStart(char c) {
 19 |   switch (c) {
 20 |   case 's':
 21 |   case 'c':
 22 |   case 't':
 23 |     return true;
 24 |   default:
 25 |     return false;
 26 |   }
 27 | }
 28 | 
 29 | // is the string a function (sqrt, sin, cos, tan)
 30 | bool Equation::isModulator(std::string t) {
 31 |   if (t.length() == 3) {
 32 |     if (t.compare("sin") == 0 || t.compare("cos") == 0 ||
 33 |         t.compare("tan") == 0) {
 34 |       return true;
 35 |     }
 36 |   } else if (t.length() == 4) {
 37 |     if (t.compare("sqrt") == 0) {
 38 |       return true;
 39 |     }
 40 |   }
 41 |   return false;
 42 | }
 43 | 
 44 | // is the char an operator (space is counted as an operator here because spaces
 45 | // have not been removed yet when this function is used
 46 | bool Equation::isOperator(char c) {
 47 |   switch (c) {
 48 |   case '+':
 49 |   case '-':
 50 |   case '/':
 51 |   case '*':
 52 |   case '^':
 53 |   case ' ':
 54 |     return true;
 55 |   default:
 56 |     return false;
 57 |   }
 58 | }
 59 | 
 60 | // process the equation into something that the computer can understand
 61 | std::string Equation::processEq(std::string eq) {
 62 |   // split equation into units and surround with parentheses
 63 |   // what is a unit?
 64 |   //	number: 3.5, 5
 65 |   //	variable: x, y
 66 |   //	modulator expression: sin(x), sin(x+2), cos(3)
 67 |   std::string stepOneOut = "";
 68 |   std::string curr = "";
 69 |   std::vector<int> exitDepths;
 70 |   bool inMod = false;
 71 |   int parenDepth = 0;
 72 |   for (auto it = eq.begin(); it < eq.end(); it++) {
 73 |     if (isOperator(*it)) {
 74 |       if (curr != "") {
 75 |         stepOneOut += "(" + curr + ")";
 76 |         curr = "";
 77 |       }
 78 |       stepOneOut += *it;
 79 |     } else if (isModStart(*it)) {
 80 |       std::string test = "";
 81 |       test += *it;
 82 |       test += *(it + 1);
 83 |       test += *(it + 2);
 84 |       if (isModulator(test)) {
 85 |         if (curr != "") {
 86 |           stepOneOut += "(" + curr + ")";
 87 |           curr = "";
 88 |         }
 89 |         stepOneOut += "(" + test + "(";
 90 |         exitDepths.push_back(parenDepth);
 91 |         inMod = true;
 92 |         it += 2;
 93 |       } else {
 94 |         test += *(it + 3);
 95 |         if (isModulator(test)) {
 96 |           if (curr != "") {
 97 |             stepOneOut += "(" + curr + ")";
 98 |             curr = "";
 99 |           }
100 | 
101 |           stepOneOut += "(" + test;
102 |           exitDepths.push_back(parenDepth);
103 |           inMod = true;
104 |           it += 3;
105 |         } else {
106 |           return "";
107 |         }
108 |       }
109 |     } else if (*it == 'x' || *it == 'y') {
110 |       if (curr != "") {
111 |         stepOneOut += "(" + curr + ")";
112 |         curr = "";
113 |       }
114 |       stepOneOut += "(";
115 |       stepOneOut += *it;
116 |       stepOneOut += ")";
117 |     } else if (*it == '(') {
118 |       parenDepth++;
119 |       if (curr != "") {
120 |         curr += "(";
121 |       } else {
122 |         stepOneOut += "(";
123 |       }
124 |     } else if (*it == ')') {
125 |       parenDepth--;
126 |       if (curr != "") {
127 |         curr += ")";
128 |       } else {
129 |         stepOneOut += ")";
130 |       }
131 |     } else {
132 |       curr += *it;
133 |     }
134 | 
135 |     // deal with units inside of a modulator
136 |     if (inMod && exitDepths.size() > 0 && *(it + 1) != '(') {
137 |       auto f = std::find(exitDepths.begin(), exitDepths.end(), parenDepth);
138 |       if (f != exitDepths.end()) {
139 |         if (curr != "") {
140 |           stepOneOut += "(" + curr + ")";
141 |           curr = "";
142 |         }
143 |         stepOneOut += "))";
144 |         exitDepths.erase(f);
145 |         inMod = false;
146 |       }
147 |     }
148 |   }
149 |   if (curr != "") {
150 |     stepOneOut += "(" + curr + ")";
151 |     curr = "";
152 |   }
153 | 
154 |   // bad hack to fix issue with parentheses not adding up
155 |   int numEnd = 0;
156 |   int numBegin = 0;
157 |   for (auto c : stepOneOut) {
158 |     if (c == ')')
159 |       numEnd++;
160 |     if (c == '(')
161 |       numBegin++;
162 |   }
163 | 
164 |   if (numBegin > numEnd) {
165 |     for (int i = 0; i < numBegin - numEnd; i++) {
166 |       stepOneOut += ")";
167 |     }
168 |   }
169 | 
170 |   // remove spaces
171 |   std::string stepTwoOut = "";
172 |   for (auto c : stepOneOut) {
173 |     if (c != ' ') {
174 |       stepTwoOut += c;
175 |     }
176 |   }
177 | 
178 |   // add implied multiplication and subtraction
179 |   // implied multiplication is when 3x = (3)*(x)
180 |   // implied subtraction is when -2 = (0) - (2)
181 |   std::string stepThreeOut = "";
182 |   for (auto it = stepTwoOut.begin(); it < stepTwoOut.end(); it++) {
183 |     if (*it == '-') {
184 |       if (it == stepTwoOut.begin()) {
185 |         stepThreeOut += "(0)-";
186 |       } else if (isOperator(*(it - 1))) {
187 |         stepThreeOut += "(0)-";
188 |       } else {
189 |         stepThreeOut += "-";
190 |       }
191 |     } else if (*it == '(') {
192 |       if (it != stepTwoOut.begin() && *(it - 1) == ')') {
193 |         stepThreeOut += "*(";
194 |       } else {
195 |         stepThreeOut += "(";
196 |       }
197 |     } else {
198 |       stepThreeOut += *it;
199 |     }
200 |   }
201 | 
202 |   return stepThreeOut;
203 | }
204 | 
205 | // evaluate at a single x-value
206 | double Equation::evalAtX(double x, bool useDeg) {
207 |   double ret = 0;
208 |   ret = baseUnit->evalUnit(x, useDeg);
209 |   return ret;
210 | }
211 | 
212 | // evaluate over a range of x-values
213 | std::map<double, double> Equation::exportRange(double xPos, double dist,
214 |                                                double resolution, bool scaleRes,
215 |                                                bool useDeg) {
216 |   std::map<double, double> ret;
217 | 
218 |   if (resolution == 0.0f)
219 |     resolution = 0.1f;
220 | 
221 |   // scale the resolution based upon the zoom of the camera
222 |   if (scaleRes)
223 |     resolution = resolution * pow(dist, 0.5f);
224 | 
225 |   double startX = xPos - dist;
226 | 
227 |   for (double i = 0; i <= dist * 2 + resolution; i += resolution) {
228 |     ret[startX + i] = evalAtX(startX + i, useDeg);
229 |   }
230 | 
231 |   return ret;
232 | }
233 | 


--------------------------------------------------------------------------------
/src/parser/unit.cpp:
--------------------------------------------------------------------------------
  1 | #include "unit.h"
  2 | 
  3 | #include <algorithm>
  4 | #include <iostream>
  5 | #include <regex>
  6 | 
  7 | // is a character an operator expression
  8 | bool Unit::isOperator(char c) {
  9 |   switch (c) {
 10 |   case '+':
 11 |   case '-':
 12 |   case '/':
 13 |   case '*':
 14 |   case '^':
 15 |     return true;
 16 |   default:
 17 |     return false;
 18 |   }
 19 | }
 20 | 
 21 | // create the unit expression
 22 | Unit::Unit(std::string eq) {
 23 |   eqStr = eq;
 24 |   modExp = false;
 25 | 
 26 |   // deal with empty unit
 27 |   if (eq == "()") {
 28 |     hasVar = false;
 29 |     noVarValDeg = 0;
 30 |     noVarValRad = 0;
 31 |     return;
 32 |   }
 33 | 
 34 |   // check if the expression has a function
 35 |   if (eq.size() >= 3) {
 36 |     if (eq.at(0) == 's' || eq.at(0) == 't' || eq.at(0) == 'c') {
 37 |       modExp = true;
 38 |     }
 39 |   }
 40 | 
 41 |   // process the expression if it has a function
 42 |   if (modExp) {
 43 |     mod t = mod::NONE;
 44 |     int subPos = 3;
 45 |     switch (eq.at(1)) {
 46 |     case 'q':
 47 |       t = mod::SQRT;
 48 |       subPos = 4;
 49 |       break;
 50 |     case 'i':
 51 |       t = mod::SIN;
 52 |       break;
 53 |     case 'o':
 54 |       t = mod::COS;
 55 |       break;
 56 |     case 'a':
 57 |       t = mod::TAN;
 58 |       break;
 59 |     }
 60 |     Modulator temp;
 61 |     temp.setM(t);
 62 |     modUnit =
 63 |         std::make_pair(temp, new Unit(eq.substr(subPos, eq.length() - subPos)));
 64 |   } else {
 65 |     // process the expression if it doesn't have a function
 66 |     int parenDepth = 0;
 67 |     std::string curr = "";
 68 |     for (auto c : eq) {
 69 |       if (c == '(') {
 70 |         parenDepth++;
 71 |       } else if (c == ')') {
 72 |         parenDepth--;
 73 |       }
 74 |       if (parenDepth == 0) {
 75 |         if (curr != "") {
 76 |           Unit temp(curr);
 77 |           exp.push_back(temp);
 78 |           curr = "";
 79 |         }
 80 |         if (isOperator(c)) {
 81 |           Operator o(c);
 82 |           exp.push_back(o);
 83 |         }
 84 |       } else {
 85 |         if (!(parenDepth == 1 && c == '(')) {
 86 |           curr += c;
 87 |         }
 88 |       }
 89 |     }
 90 |   }
 91 | 
 92 |   // detect if the expression has a variable
 93 |   // if it does have a variable, then we let it be
 94 |   // otherwise, we evaluate it so we don't have to re-evaluate it every time
 95 |   bool tempHV = false;
 96 |   for (auto c : eqStr) {
 97 |     if (c == 'x' || c == 'y') {
 98 |       tempHV = true;
 99 |       break;
100 |     }
101 |   }
102 | 
103 |   if (!tempHV) {
104 |     hasVar = true;
105 |     noVarValDeg = this->evalUnit(0, true);
106 |     noVarValRad = this->evalUnit(0, false);
107 |   }
108 |   hasVar = tempHV;
109 | }
110 | 
111 | Unit::~Unit() {}
112 | 
113 | double Unit::evalUnit(double x, bool useDeg) {
114 |   // if the expression does not have a variable, then it will be the same
115 |   // every time and we can just return that value
116 |   if (!hasVar) {
117 |     return useDeg ? noVarValDeg : noVarValRad;
118 |   }
119 |   // std::cout << eqStr << std::endl;
120 | 
121 |   // evaluate expression if it has a function
122 |   if (modExp) {
123 | 
124 |     double val = modUnit.second->evalUnit(x, useDeg);
125 |     if (useDeg) {
126 |       const double pi = 3.14159f;
127 |       val = val * pi;
128 |       val = val / 180.0f;
129 |     }
130 | 
131 |     return modUnit.first.applyMod(val);
132 |   } else {
133 |     // evaluate expression if it does not have a function
134 |     // return if its just x
135 |     if (eqStr == "x") {
136 |       return x;
137 |     }
138 |     // return if its just a number
139 |     // regex matches anything that follows the patterns d.d, .d, d., and d where
140 |     // d is any number of digits 0-9
141 |     std::smatch match;
142 |     std::regex isNum("^(\\d*)(.?)(\\d*)$");
143 |     if (std::regex_match(eqStr, match, isNum)) {
144 |       return atof(match[0].str().c_str());
145 |     }
146 |     // otherwise evaluate expression
147 |     std::vector<std::variant<double, Operator>> opVec;
148 |     for (auto i : exp) {
149 |       if (std::holds_alternative<Unit>(i)) {
150 |         opVec.push_back(std::get<Unit>(i).evalUnit(x, useDeg));
151 |       } else if (std::holds_alternative<Operator>(i)) {
152 |         opVec.push_back(std::get<Operator>(i));
153 |       } else if (std::holds_alternative<double>(i)) {
154 |         opVec.push_back(std::get<double>(i));
155 |       }
156 |     }
157 | 
158 |     return evalOps(opVec);
159 |   }
160 |   return x;
161 | }
162 | 
163 | // evaluate any operator expressions inside the unit
164 | double Unit::evalOps(std::vector<std::variant<double, Operator>> opVec) {
165 |   // handle invalid expressions
166 |   for (auto it = opVec.begin(); it < opVec.end(); it++) {
167 |     if (std::holds_alternative<Operator>(*it)) {
168 |       if (it == opVec.end() - 1) {
169 |         return 0;
170 |       }
171 |       if (!std::holds_alternative<double>(*(it - 1))) {
172 |         return 0;
173 |       }
174 |       if (!std::holds_alternative<double>(*(it + 1))) {
175 |         return 0;
176 |       }
177 |     }
178 |   }
179 |   // order of operations: exponents, multiplication and division, addition and
180 |   // subtraction
181 |   //
182 |   // exponents:
183 |   for (auto it = opVec.begin(); it < opVec.end(); it++) {
184 |     if (std::holds_alternative<Operator>(*it)) {
185 |       Operator o = std::get<Operator>(*it);
186 |       if (o.getOp() == '^') {
187 |         double lhs, rhs;
188 |         lhs = std::get<double>(*(it - 1));
189 |         rhs = std::get<double>(*(it + 1));
190 |         auto er = (it - 1);
191 |         opVec.erase(er);
192 |         opVec.erase(er);
193 |         opVec.erase(er);
194 |         opVec.insert(er, o.evalOp(lhs, rhs));
195 |       }
196 |     }
197 |   }
198 | 
199 |   // multiplication and division:
200 |   for (auto it = opVec.begin(); it < opVec.end(); it++) {
201 |     if (std::holds_alternative<Operator>(*it)) {
202 |       Operator o = std::get<Operator>(*it);
203 |       if (o.getOp() == '*' || o.getOp() == '/') {
204 |         double lhs, rhs;
205 |         lhs = std::get<double>(*(it - 1));
206 |         rhs = std::get<double>(*(it + 1));
207 |         auto er = (it - 1);
208 |         opVec.erase(er);
209 |         opVec.erase(er);
210 |         opVec.erase(er);
211 |         opVec.insert(er, o.evalOp(lhs, rhs));
212 |       }
213 |     }
214 |   }
215 | 
216 |   // addition and subtraction:
217 |   for (auto it = opVec.begin(); it < opVec.end(); it++) {
218 |     if (std::holds_alternative<Operator>(*it)) {
219 |       Operator o = std::get<Operator>(*it);
220 |       if (o.getOp() == '+' || o.getOp() == '-') {
221 |         double lhs, rhs;
222 |         lhs = std::get<double>(*(it - 1));
223 |         rhs = std::get<double>(*(it + 1));
224 |         auto er = (it - 1);
225 |         opVec.erase(er);
226 |         opVec.erase(er);
227 |         opVec.erase(er);
228 |         opVec.insert(er, o.evalOp(lhs, rhs));
229 |       }
230 |     }
231 |   }
232 | 
233 |   // if there is only one number left in the expression, return that number
234 |   if (opVec.size() == 1 && std::holds_alternative<double>(*opVec.begin())) {
235 |     return std::get<double>(*opVec.begin());
236 |   } else {
237 |     if (opVec.size() == 1) {
238 |       std::cout << "lonely operator!" << std::endl;
239 |       return 0;
240 |     }
241 |     // if there are still operators left after processing, re-process them until
242 |     // there is one number left
243 |     return evalOps(opVec);
244 |   }
245 | }
246 | 


--------------------------------------------------------------------------------
/src/renderer/renderer.cpp:
--------------------------------------------------------------------------------
  1 | #include "renderer.h"
  2 | #include "imgui/imgui.h"
  3 | 
  4 | #include <iostream>
  5 | 
  6 | Renderer::Renderer() {
  7 |   running = true;
  8 |   lineAct = false;
  9 | 
 10 |   eqUpdate = false;
 11 | 	
 12 |   //fixes problem on Windows where SDL already defines a main function
 13 |   SDL_SetMainReady();
 14 | 
 15 |   SDL_Init(SDL_INIT_VIDEO);
 16 | 
 17 |   SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
 18 |   SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
 19 |   SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
 20 |   SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
 21 | 
 22 |   gWindow = SDL_CreateWindow("glGraph", SDL_WINDOWPOS_CENTERED,
 23 |                              SDL_WINDOWPOS_CENTERED, screenWidth, screenHeight,
 24 |                              SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
 25 |   gContext = SDL_GL_CreateContext(gWindow);
 26 |   SDL_GL_MakeCurrent(gWindow, gContext);
 27 | 
 28 |   glewExperimental = true;
 29 |   glewInit();
 30 | 
 31 |   // Imgui stuff
 32 |   IMGUI_CHECKVERSION();
 33 |   ImGui::CreateContext();
 34 |   ImGuiIO &io = ImGui::GetIO();
 35 |   (void)io;
 36 | 
 37 |   ImGui::StyleColorsDark();
 38 | 
 39 |   ImGui_ImplSDL2_InitForOpenGL(gWindow, gContext);
 40 |   ImGui_ImplOpenGL3_Init();
 41 | 
 42 |   s = new Shader();
 43 |   g = new Grid();
 44 | 
 45 |   numLines = 1;
 46 |   eqBuf.push_back(new char[512]);
 47 |   for (int i = 0; i < 512; i++) {
 48 |     *(eqBuf.at(0) + i) = 0;
 49 |   }
 50 |   yOffset = 0.0f;
 51 |   xOffset = 0.0f;
 52 | 
 53 |   newColor[0] = 0;
 54 |   newColor[1] = 0;
 55 |   newColor[2] = 0;
 56 |   lInd = 0;
 57 |   currSel = -1;
 58 | 
 59 |   showMouse = false;
 60 | 
 61 |   glLineWidth(4.0f);
 62 | }
 63 | 
 64 | Renderer::~Renderer() {
 65 |   delete s;
 66 |   delete g;
 67 |   if (lineAct) {
 68 |     for (int i = 0; i < lines.size(); i++) {
 69 |       delete lines.at(i);
 70 |     }
 71 |   }
 72 |   for (int i = 0; i < eqBuf.size(); i++) {
 73 |     delete[] eqBuf.at(i);
 74 |   }
 75 |   ImGui_ImplOpenGL3_Shutdown();
 76 |   ImGui_ImplSDL2_Shutdown();
 77 |   ImGui::DestroyContext();
 78 | 
 79 |   SDL_GL_DeleteContext(gContext);
 80 |   SDL_DestroyWindow(gWindow);
 81 |   SDL_Quit();
 82 | }
 83 | 
 84 | void Renderer::clear() {
 85 |   glClearColor(0.75f, 0.75f, 0.75f, 1.0f);
 86 |   glClear(GL_COLOR_BUFFER_BIT);
 87 | }
 88 | 
 89 | void Renderer::update(double *xPos, double *scale,
 90 |                       std::vector<std::string> *equs, double *resolution,
 91 |                       bool *scaleRes, bool *updateEq, bool *updatePos,
 92 |                       bool *useDeg) {
 93 |   std::vector<std::string> oldEqBuf;
 94 |   for (auto e : eqBuf) {
 95 |     oldEqBuf.push_back(std::string(e));
 96 |   }
 97 | 
 98 |   s->useProgram();
 99 |   g->renderGrid(s);
100 |   if (lineAct) {
101 |     for (auto l : lines) {
102 |       if (l->isSelected()) {
103 |         s->setUniform3f("color", 1.0f, 1.0f, 0.0f);
104 |         glLineWidth(8.0f);
105 |         l->draw();
106 |         glLineWidth(4.0f);
107 |       }
108 |       s->setUniform3f("color", l->getColorR(), l->getColorG(), l->getColorB());
109 |       l->draw();
110 |     }
111 |   }
112 |   SDL_GetMouseState(&mouseX, &mouseY);
113 | 
114 |   ImGui_ImplOpenGL3_NewFrame();
115 |   ImGui_ImplSDL2_NewFrame(gWindow);
116 |   ImGui::NewFrame();
117 | 
118 |   ImGui::Begin("Grapher");
119 |   ImGui::Text("Resolution: ");
120 |   ImGui::SameLine();
121 |   ImGui::InputDouble("res", resolution);
122 |   ImGui::Checkbox("Scale Resolution", scaleRes);
123 |   ImGui::Checkbox("Use Degrees", useDeg);
124 |   ImGui::Text("Enter equations: ");
125 |   int lToR = -1;
126 |   for (int i = 0; i < numLines; i++) {
127 |     ImGui::InputTextWithHint(std::to_string(i).c_str(), "equation", eqBuf.at(i),
128 |                              512);
129 |     if (ImGui::Button(std::string("Remove " + std::to_string(i)).c_str())) {
130 |       lToR = i;
131 |     }
132 |   }
133 | 
134 |   if (lToR != -1 && lToR < lines.size()) {
135 |     numLines--;
136 |     lines.erase(lines.begin() + lToR);
137 |     eqBuf.erase(eqBuf.begin() + lToR);
138 |     equs->erase(equs->begin() + lToR);
139 |     *updateEq = true;
140 |     *updatePos = true;
141 |   }
142 |   if (ImGui::Button("Add line")) {
143 |     eqBuf.push_back(new char[512]);
144 |     for (int i = 0; i < 512; i++) {
145 |       *(eqBuf.at(eqBuf.size() - 1) + i) = 0;
146 |     }
147 |     equs->push_back("");
148 |     numLines++;
149 |     *updateEq = true;
150 |     *updatePos = true;
151 |   }
152 |   /*ImGui::SameLine();
153 |   if (ImGui::Button("Graph")) {
154 |     for (int i = 0; i < eqBuf.size(); i++) {
155 |       equs->at(i) = std::string(eqBuf.at(i));
156 |     }
157 |     *updateEq = true;
158 |     *updatePos = true;
159 |   }*/
160 |   // on-the-fly equation handling
161 |   for (int i = 0; i < eqBuf.size(); i++) {
162 |     if (i >= oldEqBuf.size() ||
163 |         std::string(eqBuf.at(i)).compare(oldEqBuf.at(i))) {
164 |       equs->at(i) = std::string(eqBuf.at(i));
165 |       *updateEq = true;
166 |       *updatePos = true;
167 |     }
168 |   }
169 |   ImGui::Text("Line index:");
170 |   ImGui::SameLine();
171 |   ImGui::InputInt("", &lInd);
172 |   if (lInd < 0)
173 |     lInd = lines.size() - 1;
174 |   if (lInd >= lines.size())
175 |     lInd = 0;
176 |   if (lines.size() > 0) {
177 |     if (currSel != -1)
178 |       lines.at(currSel)->setSelected(false);
179 |     currSel = lInd;
180 |     lines.at(currSel)->setSelected(true);
181 |   }
182 |   ImGui::Text("Input line color:");
183 |   ImGui::InputFloat3("rgb", newColor);
184 |   if (ImGui::Button("Update line color")) {
185 |     lines.at(lInd)->setColor(newColor[0], newColor[1], newColor[2]);
186 |   }
187 |   ImGui::Checkbox("Show stats", &showMouse);
188 |   if (showMouse) {
189 |     ImGui::Text("Camera Y: %f", -1.0f * yOffset);
190 |     ImGui::Text("Camera X: %f", -1.0f * xOffset);
191 |     ImGui::Text("Scale: %f", *scale);
192 | 
193 |     ImGui::Text("Mouse: (%f, %f)",
194 |                 double(mouseX / double(screenWidth / 2.0f) - 1.0f) - xOffset,
195 |                 double(-1.0f * (mouseY) / double(screenHeight / 2.0f) + 1.0f) -
196 |                     yOffset);
197 |   }
198 |   ImGui::End();
199 | 
200 |   ImGui::Render();
201 |   ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
202 |   SDL_GL_SwapWindow(gWindow);
203 | 
204 |   SDL_Event e;
205 |   while (SDL_PollEvent(&e)) {
206 |     ImGui_ImplSDL2_ProcessEvent(&e);
207 |     if (e.type == SDL_QUIT) {
208 |       running = false;
209 |     } else if (e.type == SDL_KEYDOWN) {
210 |       if (e.key.keysym.scancode == SDL_SCANCODE_ESCAPE) {
211 |         running = false;
212 |       } else {
213 |         double mSpeed = 0.05f * (*scale);
214 |         switch (e.key.keysym.scancode) {
215 |         case SDL_SCANCODE_W:
216 |           *updatePos = true;
217 |           yOffset -= mSpeed;
218 |           break;
219 |         case SDL_SCANCODE_S:
220 |           *updatePos = true;
221 |           yOffset += mSpeed;
222 |           break;
223 |         case SDL_SCANCODE_A:
224 |           *updatePos = true;
225 |           *xPos -= mSpeed;
226 |           xOffset += mSpeed;
227 |           break;
228 |         case SDL_SCANCODE_D:
229 |           *updatePos = true;
230 |           *xPos += mSpeed;
231 |           xOffset -= mSpeed;
232 |           break;
233 |         case SDL_SCANCODE_Q:
234 |           *updatePos = true;
235 |           *scale *= 1.1f;
236 |           break;
237 |         case SDL_SCANCODE_E:
238 |           *updatePos = true;
239 |           *scale /= 1.1f;
240 |           break;
241 |         default:
242 |           break;
243 |         }
244 |       }
245 |     }
246 |   }
247 |   if (*scale <= 0.0f) {
248 |     *scale = 0.1f;
249 |   }
250 |   if (*updatePos) {
251 |     g->updateGrid(xOffset, yOffset, *scale);
252 |   }
253 | }
254 | 
255 | void Renderer::graphPoint(double x, double y) {}
256 | 
257 | void Renderer::graphLine(std::map<double, double> points, int index,
258 |                          double scale) {
259 |   // make sure line color and selection status persists between line updates
260 |   bool select = false;
261 |   float color[3] = {1.0f, 0.0f, 0.0f};
262 |   if (lineAct && index < lines.size()) {
263 |     select = lines.at(index)->isSelected();
264 |     color[0] = lines.at(index)->getColorR();
265 |     color[1] = lines.at(index)->getColorG();
266 |     color[2] = lines.at(index)->getColorB();
267 |     delete lines.at(index);
268 |   }
269 |   lineAct = true;
270 | 
271 |   // add the vertices that make up the line
272 |   std::vector<double> verts;
273 | 
274 |   // int numPoints = points.size();
275 |   // double step = 2.0f / (numPoints - 2);
276 | 
277 |   // int i = 0;
278 |   for (auto [x, y] : points) {
279 |     verts.push_back((x + xOffset) / scale);
280 |     // verts.push_back(i * step - 1.0);
281 |     verts.push_back(y / scale + yOffset);
282 |     verts.push_back(0.0f);
283 |     // i++;
284 |   }
285 | 
286 |   // either update the line or create a new one
287 |   if (index < lines.size()) {
288 |     lines.at(index) = new Line(verts);
289 |     lines.at(index)->setSelected(select);
290 |     lines.at(index)->setColor(color[0], color[1], color[2]);
291 |   } else {
292 |     lines.push_back(new Line(verts));
293 |     lines.at(lines.size() - 1)->setColor(color[0], color[1], color[2]);
294 |   }
295 | }
296 | 


--------------------------------------------------------------------------------
/src/renderer/imgui/imconfig.h:
--------------------------------------------------------------------------------
  1 | //-----------------------------------------------------------------------------
  2 | // COMPILE-TIME OPTIONS FOR DEAR IMGUI
  3 | // Runtime options (clipboard callbacks, enabling various features, etc.) can generally be set via the ImGuiIO structure.
  4 | // You can use ImGui::SetAllocatorFunctions() before calling ImGui::CreateContext() to rewire memory allocation functions.
  5 | //-----------------------------------------------------------------------------
  6 | // A) You may edit imconfig.h (and not overwrite it when updating Dear ImGui, or maintain a patch/rebased branch with your modifications to it)
  7 | // B) or '#define IMGUI_USER_CONFIG "my_imgui_config.h"' in your project and then add directives in your own file without touching this template.
  8 | //-----------------------------------------------------------------------------
  9 | // You need to make sure that configuration settings are defined consistently _everywhere_ Dear ImGui is used, which include the imgui*.cpp
 10 | // files but also _any_ of your code that uses Dear ImGui. This is because some compile-time options have an affect on data structures.
 11 | // Defining those options in imconfig.h will ensure every compilation unit gets to see the same data structure layouts.
 12 | // Call IMGUI_CHECKVERSION() from your .cpp files to verify that the data structures your files are using are matching the ones imgui.cpp is using.
 13 | //-----------------------------------------------------------------------------
 14 | 
 15 | #pragma once
 16 | 
 17 | //---- Define assertion handler. Defaults to calling assert().
 18 | // If your macro uses multiple statements, make sure is enclosed in a 'do { .. } while (0)' block so it can be used as a single statement.
 19 | //#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
 20 | //#define IM_ASSERT(_EXPR)  ((void)(_EXPR))     // Disable asserts
 21 | 
 22 | //---- Define attributes of all API symbols declarations, e.g. for DLL under Windows
 23 | // Using Dear ImGui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
 24 | // DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
 25 | // for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
 26 | //#define IMGUI_API __declspec( dllexport )
 27 | //#define IMGUI_API __declspec( dllimport )
 28 | 
 29 | //---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to avoid using soon-to-be obsolete function/names.
 30 | //#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
 31 | 
 32 | //---- Disable all of Dear ImGui or don't implement standard windows.
 33 | // It is very strongly recommended to NOT disable the demo windows during development. Please read comments in imgui_demo.cpp.
 34 | //#define IMGUI_DISABLE                                     // Disable everything: all headers and source files will be empty.
 35 | //#define IMGUI_DISABLE_DEMO_WINDOWS                        // Disable demo windows: ShowDemoWindow()/ShowStyleEditor() will be empty. Not recommended.
 36 | //#define IMGUI_DISABLE_METRICS_WINDOW                      // Disable metrics/debugger window: ShowMetricsWindow() will be empty.
 37 | 
 38 | //---- Don't implement some functions to reduce linkage requirements.
 39 | //#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS   // [Win32] Don't implement default clipboard handler. Won't use and link with OpenClipboard/GetClipboardData/CloseClipboard etc. (user32.lib/.a, kernel32.lib/.a)
 40 | //#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS         // [Win32] Don't implement default IME handler. Won't use and link with ImmGetContext/ImmSetCompositionWindow. (imm32.lib/.a)
 41 | //#define IMGUI_DISABLE_WIN32_FUNCTIONS                     // [Win32] Won't use and link with any Win32 function (clipboard, ime).
 42 | //#define IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS      // [OSX] Implement default OSX clipboard handler (need to link with '-framework ApplicationServices', this is why this is not the default).
 43 | //#define IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS            // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself (e.g. if you don't want to link with vsnprintf)
 44 | //#define IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS              // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 so you can implement them yourself.
 45 | //#define IMGUI_DISABLE_FILE_FUNCTIONS                      // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle at all (replace them with dummies)
 46 | //#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
 47 | //#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free() to avoid linking with them. You will need to call ImGui::SetAllocatorFunctions().
 48 | 
 49 | //---- Include imgui_user.h at the end of imgui.h as a convenience
 50 | //#define IMGUI_INCLUDE_IMGUI_USER_H
 51 | 
 52 | //---- Pack colors to BGRA8 instead of RGBA8 (to avoid converting from one to another)
 53 | //#define IMGUI_USE_BGRA_PACKED_COLOR
 54 | 
 55 | //---- Use 32-bit for ImWchar (default is 16-bit) to support unicode planes 1-16. (e.g. point beyond 0xFFFF like emoticons, dingbats, symbols, shapes, ancient languages, etc...)
 56 | //#define IMGUI_USE_WCHAR32
 57 | 
 58 | //---- Avoid multiple STB libraries implementations, or redefine path/filenames to prioritize another version
 59 | // By default the embedded implementations are declared static and not available outside of Dear ImGui sources files.
 60 | //#define IMGUI_STB_TRUETYPE_FILENAME   "my_folder/stb_truetype.h"
 61 | //#define IMGUI_STB_RECT_PACK_FILENAME  "my_folder/stb_rect_pack.h"
 62 | //#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
 63 | //#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
 64 | 
 65 | //---- Use stb_printf's faster implementation of vsnprintf instead of the one from libc (unless IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS is defined)
 66 | // Requires 'stb_sprintf.h' to be available in the include path. Compatibility checks of arguments and formats done by clang and GCC will be disabled in order to support the extra formats provided by STB sprintf.
 67 | // #define IMGUI_USE_STB_SPRINTF
 68 | 
 69 | //---- Use FreeType to build and rasterize the font atlas (instead of stb_truetype which is embedded by default in Dear ImGui)
 70 | // Requires FreeType headers to be available in the include path. Requires program to be compiled with 'misc/freetype/imgui_freetype.cpp' (in this repository) + the FreeType library (not provided).
 71 | // On Windows you may use vcpkg with 'vcpkg install freetype' + 'vcpkg integrate install'.
 72 | //#define IMGUI_ENABLE_FREETYPE
 73 | 
 74 | //---- Use stb_truetype to build and rasterize the font atlas (default)
 75 | // The only purpose of this define is if you want force compilation of the stb_truetype backend ALONG with the FreeType backend.
 76 | //#define IMGUI_ENABLE_STB_TRUETYPE
 77 | 
 78 | //---- Define constructor and implicit cast operators to convert back<>forth between your math types and ImVec2/ImVec4.
 79 | // This will be inlined as part of ImVec2 and ImVec4 class declarations.
 80 | /*
 81 | #define IM_VEC2_CLASS_EXTRA                                                 \
 82 |         ImVec2(const MyVec2& f) { x = f.x; y = f.y; }                       \
 83 |         operator MyVec2() const { return MyVec2(x,y); }
 84 | 
 85 | #define IM_VEC4_CLASS_EXTRA                                                 \
 86 |         ImVec4(const MyVec4& f) { x = f.x; y = f.y; z = f.z; w = f.w; }     \
 87 |         operator MyVec4() const { return MyVec4(x,y,z,w); }
 88 | */
 89 | 
 90 | //---- Use 32-bit vertex indices (default is 16-bit) is one way to allow large meshes with more than 64K vertices.
 91 | // Your renderer backend will need to support it (most example renderer backends support both 16/32-bit indices).
 92 | // Another way to allow large meshes while keeping 16-bit indices is to handle ImDrawCmd::VtxOffset in your renderer.
 93 | // Read about ImGuiBackendFlags_RendererHasVtxOffset for details.
 94 | //#define ImDrawIdx unsigned int
 95 | 
 96 | //---- Override ImDrawCallback signature (will need to modify renderer backends accordingly)
 97 | //struct ImDrawList;
 98 | //struct ImDrawCmd;
 99 | //typedef void (*MyImDrawCallback)(const ImDrawList* draw_list, const ImDrawCmd* cmd, void* my_renderer_user_data);
100 | //#define ImDrawCallback MyImDrawCallback
101 | 
102 | //---- Debug Tools: Macro to break in Debugger
103 | // (use 'Metrics->Tools->Item Picker' to pick widgets with the mouse and break into them for easy debugging.)
104 | //#define IM_DEBUG_BREAK  IM_ASSERT(0)
105 | //#define IM_DEBUG_BREAK  __debugbreak()
106 | 
107 | //---- Debug Tools: Have the Item Picker break in the ItemAdd() function instead of ItemHoverable(),
108 | // (which comes earlier in the code, will catch a few extra items, allow picking items other than Hovered one.)
109 | // This adds a small runtime cost which is why it is not enabled by default.
110 | //#define IMGUI_DEBUG_TOOL_ITEM_PICKER_EX
111 | 
112 | //---- Debug Tools: Enable slower asserts
113 | //#define IMGUI_DEBUG_PARANOID
114 | 
115 | //---- Tip: You can add extra functions within the ImGui:: namespace, here or in your own headers files.
116 | /*
117 | namespace ImGui
118 | {
119 |     void MyFunction(const char* name, const MyMatrix44& v);
120 | }
121 | */
122 | 


--------------------------------------------------------------------------------
/src/renderer/imgui/imgui_impl_sdl.cpp:
--------------------------------------------------------------------------------
  1 | // dear imgui: Platform Backend for SDL2
  2 | // This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
  3 | // (Info: SDL2 is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc.)
  4 | // (Requires: SDL 2.0. Prefer SDL 2.0.4+ for full feature support.)
  5 | 
  6 | // Implemented features:
  7 | //  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
  8 | //  [X] Platform: Clipboard support.
  9 | //  [X] Platform: Keyboard arrays indexed using SDL_SCANCODE_* codes, e.g. ImGui::IsKeyPressed(SDL_SCANCODE_SPACE).
 10 | //  [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
 11 | // Missing features:
 12 | //  [ ] Platform: SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME.
 13 | 
 14 | // You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 15 | // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
 16 | // Read online: https://github.com/ocornut/imgui/tree/master/docs
 17 | 
 18 | // CHANGELOG
 19 | // (minor and older changes stripped away, please see git history for details)
 20 | //  2021-03-22: Rework global mouse pos availability check listing supported platforms explicitly, effectively fixing mouse access on Raspberry Pi. (#2837, #3950)
 21 | //  2020-05-25: Misc: Report a zero display-size when window is minimized, to be consistent with other backends.
 22 | //  2020-02-20: Inputs: Fixed mapping for ImGuiKey_KeyPadEnter (using SDL_SCANCODE_KP_ENTER instead of SDL_SCANCODE_RETURN2).
 23 | //  2019-12-17: Inputs: On Wayland, use SDL_GetMouseState (because there is no global mouse state).
 24 | //  2019-12-05: Inputs: Added support for ImGuiMouseCursor_NotAllowed mouse cursor.
 25 | //  2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
 26 | //  2019-04-23: Inputs: Added support for SDL_GameController (if ImGuiConfigFlags_NavEnableGamepad is set by user application).
 27 | //  2019-03-12: Misc: Preserve DisplayFramebufferScale when main window is minimized.
 28 | //  2018-12-21: Inputs: Workaround for Android/iOS which don't seem to handle focus related calls.
 29 | //  2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window.
 30 | //  2018-11-14: Changed the signature of ImGui_ImplSDL2_ProcessEvent() to take a 'const SDL_Event*'.
 31 | //  2018-08-01: Inputs: Workaround for Emscripten which doesn't seem to handle focus related calls.
 32 | //  2018-06-29: Inputs: Added support for the ImGuiMouseCursor_Hand cursor.
 33 | //  2018-06-08: Misc: Extracted imgui_impl_sdl.cpp/.h away from the old combined SDL2+OpenGL/Vulkan examples.
 34 | //  2018-06-08: Misc: ImGui_ImplSDL2_InitForOpenGL() now takes a SDL_GLContext parameter.
 35 | //  2018-05-09: Misc: Fixed clipboard paste memory leak (we didn't call SDL_FreeMemory on the data returned by SDL_GetClipboardText).
 36 | //  2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
 37 | //  2018-02-16: Inputs: Added support for mouse cursors, honoring ImGui::GetMouseCursor() value.
 38 | //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
 39 | //  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
 40 | //  2018-02-05: Misc: Using SDL_GetPerformanceCounter() instead of SDL_GetTicks() to be able to handle very high framerate (1000+ FPS).
 41 | //  2018-02-05: Inputs: Keyboard mapping is using scancodes everywhere instead of a confusing mixture of keycodes and scancodes.
 42 | //  2018-01-20: Inputs: Added Horizontal Mouse Wheel support.
 43 | //  2018-01-19: Inputs: When available (SDL 2.0.4+) using SDL_CaptureMouse() to retrieve coordinates outside of client area when dragging. Otherwise (SDL 2.0.3 and before) testing for SDL_WINDOW_INPUT_FOCUS instead of SDL_WINDOW_MOUSE_FOCUS.
 44 | //  2018-01-18: Inputs: Added mapping for ImGuiKey_Insert.
 45 | //  2017-08-25: Inputs: MousePos set to -FLT_MAX,-FLT_MAX when mouse is unavailable/missing (instead of -1,-1).
 46 | //  2016-10-15: Misc: Added a void* user_data parameter to Clipboard function handlers.
 47 | 
 48 | #include "imgui.h"
 49 | #include "imgui_impl_sdl.h"
 50 | 
 51 | // SDL
 52 | #include <SDL2/SDL.h>
 53 | #include <SDL2/SDL_syswm.h>
 54 | #if defined(__APPLE__)
 55 | #include "TargetConditionals.h"
 56 | #endif
 57 | 
 58 | #define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE    SDL_VERSION_ATLEAST(2,0,4)
 59 | #define SDL_HAS_VULKAN                      SDL_VERSION_ATLEAST(2,0,6)
 60 | 
 61 | // Data
 62 | static SDL_Window*  g_Window = NULL;
 63 | static Uint64       g_Time = 0;
 64 | static bool         g_MousePressed[3] = { false, false, false };
 65 | static SDL_Cursor*  g_MouseCursors[ImGuiMouseCursor_COUNT] = {};
 66 | static char*        g_ClipboardTextData = NULL;
 67 | static bool         g_MouseCanUseGlobalState = true;
 68 | 
 69 | static const char* ImGui_ImplSDL2_GetClipboardText(void*)
 70 | {
 71 |     if (g_ClipboardTextData)
 72 |         SDL_free(g_ClipboardTextData);
 73 |     g_ClipboardTextData = SDL_GetClipboardText();
 74 |     return g_ClipboardTextData;
 75 | }
 76 | 
 77 | static void ImGui_ImplSDL2_SetClipboardText(void*, const char* text)
 78 | {
 79 |     SDL_SetClipboardText(text);
 80 | }
 81 | 
 82 | // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
 83 | // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
 84 | // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
 85 | // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
 86 | // If you have multiple SDL events and some of them are not meant to be used by dear imgui, you may need to filter events based on their windowID field.
 87 | bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
 88 | {
 89 |     ImGuiIO& io = ImGui::GetIO();
 90 |     switch (event->type)
 91 |     {
 92 |     case SDL_MOUSEWHEEL:
 93 |         {
 94 |             if (event->wheel.x > 0) io.MouseWheelH += 1;
 95 |             if (event->wheel.x < 0) io.MouseWheelH -= 1;
 96 |             if (event->wheel.y > 0) io.MouseWheel += 1;
 97 |             if (event->wheel.y < 0) io.MouseWheel -= 1;
 98 |             return true;
 99 |         }
100 |     case SDL_MOUSEBUTTONDOWN:
101 |         {
102 |             if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true;
103 |             if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true;
104 |             if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true;
105 |             return true;
106 |         }
107 |     case SDL_TEXTINPUT:
108 |         {
109 |             io.AddInputCharactersUTF8(event->text.text);
110 |             return true;
111 |         }
112 |     case SDL_KEYDOWN:
113 |     case SDL_KEYUP:
114 |         {
115 |             int key = event->key.keysym.scancode;
116 |             IM_ASSERT(key >= 0 && key < IM_ARRAYSIZE(io.KeysDown));
117 |             io.KeysDown[key] = (event->type == SDL_KEYDOWN);
118 |             io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0);
119 |             io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0);
120 |             io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0);
121 | #ifdef _WIN32
122 |             io.KeySuper = false;
123 | #else
124 |             io.KeySuper = ((SDL_GetModState() & KMOD_GUI) != 0);
125 | #endif
126 |             return true;
127 |         }
128 |     }
129 |     return false;
130 | }
131 | 
132 | static bool ImGui_ImplSDL2_Init(SDL_Window* window)
133 | {
134 |     g_Window = window;
135 | 
136 |     // Setup backend capabilities flags
137 |     ImGuiIO& io = ImGui::GetIO();
138 |     io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;       // We can honor GetMouseCursor() values (optional)
139 |     io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;        // We can honor io.WantSetMousePos requests (optional, rarely used)
140 |     io.BackendPlatformName = "imgui_impl_sdl";
141 | 
142 |     // Keyboard mapping. Dear ImGui will use those indices to peek into the io.KeysDown[] array.
143 |     io.KeyMap[ImGuiKey_Tab] = SDL_SCANCODE_TAB;
144 |     io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT;
145 |     io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT;
146 |     io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP;
147 |     io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN;
148 |     io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP;
149 |     io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN;
150 |     io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME;
151 |     io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END;
152 |     io.KeyMap[ImGuiKey_Insert] = SDL_SCANCODE_INSERT;
153 |     io.KeyMap[ImGuiKey_Delete] = SDL_SCANCODE_DELETE;
154 |     io.KeyMap[ImGuiKey_Backspace] = SDL_SCANCODE_BACKSPACE;
155 |     io.KeyMap[ImGuiKey_Space] = SDL_SCANCODE_SPACE;
156 |     io.KeyMap[ImGuiKey_Enter] = SDL_SCANCODE_RETURN;
157 |     io.KeyMap[ImGuiKey_Escape] = SDL_SCANCODE_ESCAPE;
158 |     io.KeyMap[ImGuiKey_KeyPadEnter] = SDL_SCANCODE_KP_ENTER;
159 |     io.KeyMap[ImGuiKey_A] = SDL_SCANCODE_A;
160 |     io.KeyMap[ImGuiKey_C] = SDL_SCANCODE_C;
161 |     io.KeyMap[ImGuiKey_V] = SDL_SCANCODE_V;
162 |     io.KeyMap[ImGuiKey_X] = SDL_SCANCODE_X;
163 |     io.KeyMap[ImGuiKey_Y] = SDL_SCANCODE_Y;
164 |     io.KeyMap[ImGuiKey_Z] = SDL_SCANCODE_Z;
165 | 
166 |     io.SetClipboardTextFn = ImGui_ImplSDL2_SetClipboardText;
167 |     io.GetClipboardTextFn = ImGui_ImplSDL2_GetClipboardText;
168 |     io.ClipboardUserData = NULL;
169 | 
170 |     // Load mouse cursors
171 |     g_MouseCursors[ImGuiMouseCursor_Arrow] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
172 |     g_MouseCursors[ImGuiMouseCursor_TextInput] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_IBEAM);
173 |     g_MouseCursors[ImGuiMouseCursor_ResizeAll] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEALL);
174 |     g_MouseCursors[ImGuiMouseCursor_ResizeNS] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENS);
175 |     g_MouseCursors[ImGuiMouseCursor_ResizeEW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEWE);
176 |     g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENESW);
177 |     g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENWSE);
178 |     g_MouseCursors[ImGuiMouseCursor_Hand] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
179 |     g_MouseCursors[ImGuiMouseCursor_NotAllowed] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NO);
180 | 
181 |     // Check and store if we are on a SDL backend that supports global mouse position
182 |     // ("wayland" and "rpi" don't support it, but we chose to use a white-list instead of a black-list)
183 |     const char* sdl_backend = SDL_GetCurrentVideoDriver();
184 |     const char* global_mouse_whitelist[] = { "windows", "cocoa", "x11", "DIVE", "VMAN" };
185 |     g_MouseCanUseGlobalState = false;
186 |     for (int n = 0; n < IM_ARRAYSIZE(global_mouse_whitelist); n++)
187 |         if (strncmp(sdl_backend, global_mouse_whitelist[n], strlen(global_mouse_whitelist[n])) == 0)
188 |             g_MouseCanUseGlobalState = true;
189 | 
190 | #ifdef _WIN32
191 |     SDL_SysWMinfo wmInfo;
192 |     SDL_VERSION(&wmInfo.version);
193 |     SDL_GetWindowWMInfo(window, &wmInfo);
194 |     io.ImeWindowHandle = wmInfo.info.win.window;
195 | #else
196 |     (void)window;
197 | #endif
198 | 
199 |     return true;
200 | }
201 | 
202 | bool ImGui_ImplSDL2_InitForOpenGL(SDL_Window* window, void* sdl_gl_context)
203 | {
204 |     (void)sdl_gl_context; // Viewport branch will need this.
205 |     return ImGui_ImplSDL2_Init(window);
206 | }
207 | 
208 | bool ImGui_ImplSDL2_InitForVulkan(SDL_Window* window)
209 | {
210 | #if !SDL_HAS_VULKAN
211 |     IM_ASSERT(0 && "Unsupported");
212 | #endif
213 |     return ImGui_ImplSDL2_Init(window);
214 | }
215 | 
216 | bool ImGui_ImplSDL2_InitForD3D(SDL_Window* window)
217 | {
218 | #if !defined(_WIN32)
219 |     IM_ASSERT(0 && "Unsupported");
220 | #endif
221 |     return ImGui_ImplSDL2_Init(window);
222 | }
223 | 
224 | bool ImGui_ImplSDL2_InitForMetal(SDL_Window* window)
225 | {
226 |     return ImGui_ImplSDL2_Init(window);
227 | }
228 | 
229 | void ImGui_ImplSDL2_Shutdown()
230 | {
231 |     g_Window = NULL;
232 | 
233 |     // Destroy last known clipboard data
234 |     if (g_ClipboardTextData)
235 |         SDL_free(g_ClipboardTextData);
236 |     g_ClipboardTextData = NULL;
237 | 
238 |     // Destroy SDL mouse cursors
239 |     for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
240 |         SDL_FreeCursor(g_MouseCursors[cursor_n]);
241 |     memset(g_MouseCursors, 0, sizeof(g_MouseCursors));
242 | }
243 | 
244 | static void ImGui_ImplSDL2_UpdateMousePosAndButtons()
245 | {
246 |     ImGuiIO& io = ImGui::GetIO();
247 | 
248 |     // Set OS mouse position if requested (rarely used, only when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
249 |     if (io.WantSetMousePos)
250 |         SDL_WarpMouseInWindow(g_Window, (int)io.MousePos.x, (int)io.MousePos.y);
251 |     else
252 |         io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
253 | 
254 |     int mx, my;
255 |     Uint32 mouse_buttons = SDL_GetMouseState(&mx, &my);
256 |     io.MouseDown[0] = g_MousePressed[0] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0;  // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
257 |     io.MouseDown[1] = g_MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
258 |     io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
259 |     g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
260 | 
261 | #if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__) && !(defined(__APPLE__) && TARGET_OS_IOS)
262 |     SDL_Window* focused_window = SDL_GetKeyboardFocus();
263 |     if (g_Window == focused_window)
264 |     {
265 |         if (g_MouseCanUseGlobalState)
266 |         {
267 |             // SDL_GetMouseState() gives mouse position seemingly based on the last window entered/focused(?)
268 |             // The creation of a new windows at runtime and SDL_CaptureMouse both seems to severely mess up with that, so we retrieve that position globally.
269 |             // Won't use this workaround on SDL backends that have no global mouse position, like Wayland or RPI
270 |             int wx, wy;
271 |             SDL_GetWindowPosition(focused_window, &wx, &wy);
272 |             SDL_GetGlobalMouseState(&mx, &my);
273 |             mx -= wx;
274 |             my -= wy;
275 |         }
276 |         io.MousePos = ImVec2((float)mx, (float)my);
277 |     }
278 | 
279 |     // SDL_CaptureMouse() let the OS know e.g. that our imgui drag outside the SDL window boundaries shouldn't e.g. trigger the OS window resize cursor.
280 |     // The function is only supported from SDL 2.0.4 (released Jan 2016)
281 |     bool any_mouse_button_down = ImGui::IsAnyMouseDown();
282 |     SDL_CaptureMouse(any_mouse_button_down ? SDL_TRUE : SDL_FALSE);
283 | #else
284 |     if (SDL_GetWindowFlags(g_Window) & SDL_WINDOW_INPUT_FOCUS)
285 |         io.MousePos = ImVec2((float)mx, (float)my);
286 | #endif
287 | }
288 | 
289 | static void ImGui_ImplSDL2_UpdateMouseCursor()
290 | {
291 |     ImGuiIO& io = ImGui::GetIO();
292 |     if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
293 |         return;
294 | 
295 |     ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
296 |     if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None)
297 |     {
298 |         // Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
299 |         SDL_ShowCursor(SDL_FALSE);
300 |     }
301 |     else
302 |     {
303 |         // Show OS mouse cursor
304 |         SDL_SetCursor(g_MouseCursors[imgui_cursor] ? g_MouseCursors[imgui_cursor] : g_MouseCursors[ImGuiMouseCursor_Arrow]);
305 |         SDL_ShowCursor(SDL_TRUE);
306 |     }
307 | }
308 | 
309 | static void ImGui_ImplSDL2_UpdateGamepads()
310 | {
311 |     ImGuiIO& io = ImGui::GetIO();
312 |     memset(io.NavInputs, 0, sizeof(io.NavInputs));
313 |     if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0)
314 |         return;
315 | 
316 |     // Get gamepad
317 |     SDL_GameController* game_controller = SDL_GameControllerOpen(0);
318 |     if (!game_controller)
319 |     {
320 |         io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
321 |         return;
322 |     }
323 | 
324 |     // Update gamepad inputs
325 |     #define MAP_BUTTON(NAV_NO, BUTTON_NO)       { io.NavInputs[NAV_NO] = (SDL_GameControllerGetButton(game_controller, BUTTON_NO) != 0) ? 1.0f : 0.0f; }
326 |     #define MAP_ANALOG(NAV_NO, AXIS_NO, V0, V1) { float vn = (float)(SDL_GameControllerGetAxis(game_controller, AXIS_NO) - V0) / (float)(V1 - V0); if (vn > 1.0f) vn = 1.0f; if (vn > 0.0f && io.NavInputs[NAV_NO] < vn) io.NavInputs[NAV_NO] = vn; }
327 |     const int thumb_dead_zone = 8000;           // SDL_gamecontroller.h suggests using this value.
328 |     MAP_BUTTON(ImGuiNavInput_Activate,      SDL_CONTROLLER_BUTTON_A);               // Cross / A
329 |     MAP_BUTTON(ImGuiNavInput_Cancel,        SDL_CONTROLLER_BUTTON_B);               // Circle / B
330 |     MAP_BUTTON(ImGuiNavInput_Menu,          SDL_CONTROLLER_BUTTON_X);               // Square / X
331 |     MAP_BUTTON(ImGuiNavInput_Input,         SDL_CONTROLLER_BUTTON_Y);               // Triangle / Y
332 |     MAP_BUTTON(ImGuiNavInput_DpadLeft,      SDL_CONTROLLER_BUTTON_DPAD_LEFT);       // D-Pad Left
333 |     MAP_BUTTON(ImGuiNavInput_DpadRight,     SDL_CONTROLLER_BUTTON_DPAD_RIGHT);      // D-Pad Right
334 |     MAP_BUTTON(ImGuiNavInput_DpadUp,        SDL_CONTROLLER_BUTTON_DPAD_UP);         // D-Pad Up
335 |     MAP_BUTTON(ImGuiNavInput_DpadDown,      SDL_CONTROLLER_BUTTON_DPAD_DOWN);       // D-Pad Down
336 |     MAP_BUTTON(ImGuiNavInput_FocusPrev,     SDL_CONTROLLER_BUTTON_LEFTSHOULDER);    // L1 / LB
337 |     MAP_BUTTON(ImGuiNavInput_FocusNext,     SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);   // R1 / RB
338 |     MAP_BUTTON(ImGuiNavInput_TweakSlow,     SDL_CONTROLLER_BUTTON_LEFTSHOULDER);    // L1 / LB
339 |     MAP_BUTTON(ImGuiNavInput_TweakFast,     SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);   // R1 / RB
340 |     MAP_ANALOG(ImGuiNavInput_LStickLeft,    SDL_CONTROLLER_AXIS_LEFTX, -thumb_dead_zone, -32768);
341 |     MAP_ANALOG(ImGuiNavInput_LStickRight,   SDL_CONTROLLER_AXIS_LEFTX, +thumb_dead_zone, +32767);
342 |     MAP_ANALOG(ImGuiNavInput_LStickUp,      SDL_CONTROLLER_AXIS_LEFTY, -thumb_dead_zone, -32767);
343 |     MAP_ANALOG(ImGuiNavInput_LStickDown,    SDL_CONTROLLER_AXIS_LEFTY, +thumb_dead_zone, +32767);
344 | 
345 |     io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
346 |     #undef MAP_BUTTON
347 |     #undef MAP_ANALOG
348 | }
349 | 
350 | void ImGui_ImplSDL2_NewFrame(SDL_Window* window)
351 | {
352 |     ImGuiIO& io = ImGui::GetIO();
353 |     IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer backend. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
354 | 
355 |     // Setup display size (every frame to accommodate for window resizing)
356 |     int w, h;
357 |     int display_w, display_h;
358 |     SDL_GetWindowSize(window, &w, &h);
359 |     if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
360 |         w = h = 0;
361 |     SDL_GL_GetDrawableSize(window, &display_w, &display_h);
362 |     io.DisplaySize = ImVec2((float)w, (float)h);
363 |     if (w > 0 && h > 0)
364 |         io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h);
365 | 
366 |     // Setup time step (we don't use SDL_GetTicks() because it is using millisecond resolution)
367 |     static Uint64 frequency = SDL_GetPerformanceFrequency();
368 |     Uint64 current_time = SDL_GetPerformanceCounter();
369 |     io.DeltaTime = g_Time > 0 ? (float)((double)(current_time - g_Time) / frequency) : (float)(1.0f / 60.0f);
370 |     g_Time = current_time;
371 | 
372 |     ImGui_ImplSDL2_UpdateMousePosAndButtons();
373 |     ImGui_ImplSDL2_UpdateMouseCursor();
374 | 
375 |     // Update game controllers (if enabled and available)
376 |     ImGui_ImplSDL2_UpdateGamepads();
377 | }
378 | 


--------------------------------------------------------------------------------
/src/renderer/imgui/imstb_rectpack.h:
--------------------------------------------------------------------------------
  1 | // [DEAR IMGUI]
  2 | // This is a slightly modified version of stb_rect_pack.h 1.00.
  3 | // Those changes would need to be pushed into nothings/stb:
  4 | // - Added STBRP__CDECL
  5 | // Grep for [DEAR IMGUI] to find the changes.
  6 | 
  7 | // stb_rect_pack.h - v1.00 - public domain - rectangle packing
  8 | // Sean Barrett 2014
  9 | //
 10 | // Useful for e.g. packing rectangular textures into an atlas.
 11 | // Does not do rotation.
 12 | //
 13 | // Not necessarily the awesomest packing method, but better than
 14 | // the totally naive one in stb_truetype (which is primarily what
 15 | // this is meant to replace).
 16 | //
 17 | // Has only had a few tests run, may have issues.
 18 | //
 19 | // More docs to come.
 20 | //
 21 | // No memory allocations; uses qsort() and assert() from stdlib.
 22 | // Can override those by defining STBRP_SORT and STBRP_ASSERT.
 23 | //
 24 | // This library currently uses the Skyline Bottom-Left algorithm.
 25 | //
 26 | // Please note: better rectangle packers are welcome! Please
 27 | // implement them to the same API, but with a different init
 28 | // function.
 29 | //
 30 | // Credits
 31 | //
 32 | //  Library
 33 | //    Sean Barrett
 34 | //  Minor features
 35 | //    Martins Mozeiko
 36 | //    github:IntellectualKitty
 37 | //    
 38 | //  Bugfixes / warning fixes
 39 | //    Jeremy Jaussaud
 40 | //    Fabian Giesen
 41 | //
 42 | // Version history:
 43 | //
 44 | //     1.00  (2019-02-25)  avoid small space waste; gracefully fail too-wide rectangles
 45 | //     0.99  (2019-02-07)  warning fixes
 46 | //     0.11  (2017-03-03)  return packing success/fail result
 47 | //     0.10  (2016-10-25)  remove cast-away-const to avoid warnings
 48 | //     0.09  (2016-08-27)  fix compiler warnings
 49 | //     0.08  (2015-09-13)  really fix bug with empty rects (w=0 or h=0)
 50 | //     0.07  (2015-09-13)  fix bug with empty rects (w=0 or h=0)
 51 | //     0.06  (2015-04-15)  added STBRP_SORT to allow replacing qsort
 52 | //     0.05:  added STBRP_ASSERT to allow replacing assert
 53 | //     0.04:  fixed minor bug in STBRP_LARGE_RECTS support
 54 | //     0.01:  initial release
 55 | //
 56 | // LICENSE
 57 | //
 58 | //   See end of file for license information.
 59 | 
 60 | //////////////////////////////////////////////////////////////////////////////
 61 | //
 62 | //       INCLUDE SECTION
 63 | //
 64 | 
 65 | #ifndef STB_INCLUDE_STB_RECT_PACK_H
 66 | #define STB_INCLUDE_STB_RECT_PACK_H
 67 | 
 68 | #define STB_RECT_PACK_VERSION  1
 69 | 
 70 | #ifdef STBRP_STATIC
 71 | #define STBRP_DEF static
 72 | #else
 73 | #define STBRP_DEF extern
 74 | #endif
 75 | 
 76 | #ifdef __cplusplus
 77 | extern "C" {
 78 | #endif
 79 | 
 80 | typedef struct stbrp_context stbrp_context;
 81 | typedef struct stbrp_node    stbrp_node;
 82 | typedef struct stbrp_rect    stbrp_rect;
 83 | 
 84 | #ifdef STBRP_LARGE_RECTS
 85 | typedef int            stbrp_coord;
 86 | #else
 87 | typedef unsigned short stbrp_coord;
 88 | #endif
 89 | 
 90 | STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
 91 | // Assign packed locations to rectangles. The rectangles are of type
 92 | // 'stbrp_rect' defined below, stored in the array 'rects', and there
 93 | // are 'num_rects' many of them.
 94 | //
 95 | // Rectangles which are successfully packed have the 'was_packed' flag
 96 | // set to a non-zero value and 'x' and 'y' store the minimum location
 97 | // on each axis (i.e. bottom-left in cartesian coordinates, top-left
 98 | // if you imagine y increasing downwards). Rectangles which do not fit
 99 | // have the 'was_packed' flag set to 0.
100 | //
101 | // You should not try to access the 'rects' array from another thread
102 | // while this function is running, as the function temporarily reorders
103 | // the array while it executes.
104 | //
105 | // To pack into another rectangle, you need to call stbrp_init_target
106 | // again. To continue packing into the same rectangle, you can call
107 | // this function again. Calling this multiple times with multiple rect
108 | // arrays will probably produce worse packing results than calling it
109 | // a single time with the full rectangle array, but the option is
110 | // available.
111 | //
112 | // The function returns 1 if all of the rectangles were successfully
113 | // packed and 0 otherwise.
114 | 
115 | struct stbrp_rect
116 | {
117 |    // reserved for your use:
118 |    int            id;
119 | 
120 |    // input:
121 |    stbrp_coord    w, h;
122 | 
123 |    // output:
124 |    stbrp_coord    x, y;
125 |    int            was_packed;  // non-zero if valid packing
126 | 
127 | }; // 16 bytes, nominally
128 | 
129 | 
130 | STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
131 | // Initialize a rectangle packer to:
132 | //    pack a rectangle that is 'width' by 'height' in dimensions
133 | //    using temporary storage provided by the array 'nodes', which is 'num_nodes' long
134 | //
135 | // You must call this function every time you start packing into a new target.
136 | //
137 | // There is no "shutdown" function. The 'nodes' memory must stay valid for
138 | // the following stbrp_pack_rects() call (or calls), but can be freed after
139 | // the call (or calls) finish.
140 | //
141 | // Note: to guarantee best results, either:
142 | //       1. make sure 'num_nodes' >= 'width'
143 | //   or  2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
144 | //
145 | // If you don't do either of the above things, widths will be quantized to multiples
146 | // of small integers to guarantee the algorithm doesn't run out of temporary storage.
147 | //
148 | // If you do #2, then the non-quantized algorithm will be used, but the algorithm
149 | // may run out of temporary storage and be unable to pack some rectangles.
150 | 
151 | STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
152 | // Optionally call this function after init but before doing any packing to
153 | // change the handling of the out-of-temp-memory scenario, described above.
154 | // If you call init again, this will be reset to the default (false).
155 | 
156 | 
157 | STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
158 | // Optionally select which packing heuristic the library should use. Different
159 | // heuristics will produce better/worse results for different data sets.
160 | // If you call init again, this will be reset to the default.
161 | 
162 | enum
163 | {
164 |    STBRP_HEURISTIC_Skyline_default=0,
165 |    STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
166 |    STBRP_HEURISTIC_Skyline_BF_sortHeight
167 | };
168 | 
169 | 
170 | //////////////////////////////////////////////////////////////////////////////
171 | //
172 | // the details of the following structures don't matter to you, but they must
173 | // be visible so you can handle the memory allocations for them
174 | 
175 | struct stbrp_node
176 | {
177 |    stbrp_coord  x,y;
178 |    stbrp_node  *next;
179 | };
180 | 
181 | struct stbrp_context
182 | {
183 |    int width;
184 |    int height;
185 |    int align;
186 |    int init_mode;
187 |    int heuristic;
188 |    int num_nodes;
189 |    stbrp_node *active_head;
190 |    stbrp_node *free_head;
191 |    stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
192 | };
193 | 
194 | #ifdef __cplusplus
195 | }
196 | #endif
197 | 
198 | #endif
199 | 
200 | //////////////////////////////////////////////////////////////////////////////
201 | //
202 | //     IMPLEMENTATION SECTION
203 | //
204 | 
205 | #ifdef STB_RECT_PACK_IMPLEMENTATION
206 | #ifndef STBRP_SORT
207 | #include <stdlib.h>
208 | #define STBRP_SORT qsort
209 | #endif
210 | 
211 | #ifndef STBRP_ASSERT
212 | #include <assert.h>
213 | #define STBRP_ASSERT assert
214 | #endif
215 | 
216 | // [DEAR IMGUI] Added STBRP__CDECL
217 | #ifdef _MSC_VER
218 | #define STBRP__NOTUSED(v)  (void)(v)
219 | #define STBRP__CDECL __cdecl
220 | #else
221 | #define STBRP__NOTUSED(v)  (void)sizeof(v)
222 | #define STBRP__CDECL
223 | #endif
224 | 
225 | enum
226 | {
227 |    STBRP__INIT_skyline = 1
228 | };
229 | 
230 | STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
231 | {
232 |    switch (context->init_mode) {
233 |       case STBRP__INIT_skyline:
234 |          STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
235 |          context->heuristic = heuristic;
236 |          break;
237 |       default:
238 |          STBRP_ASSERT(0);
239 |    }
240 | }
241 | 
242 | STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
243 | {
244 |    if (allow_out_of_mem)
245 |       // if it's ok to run out of memory, then don't bother aligning them;
246 |       // this gives better packing, but may fail due to OOM (even though
247 |       // the rectangles easily fit). @TODO a smarter approach would be to only
248 |       // quantize once we've hit OOM, then we could get rid of this parameter.
249 |       context->align = 1;
250 |    else {
251 |       // if it's not ok to run out of memory, then quantize the widths
252 |       // so that num_nodes is always enough nodes.
253 |       //
254 |       // I.e. num_nodes * align >= width
255 |       //                  align >= width / num_nodes
256 |       //                  align = ceil(width/num_nodes)
257 | 
258 |       context->align = (context->width + context->num_nodes-1) / context->num_nodes;
259 |    }
260 | }
261 | 
262 | STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
263 | {
264 |    int i;
265 | #ifndef STBRP_LARGE_RECTS
266 |    STBRP_ASSERT(width <= 0xffff && height <= 0xffff);
267 | #endif
268 | 
269 |    for (i=0; i < num_nodes-1; ++i)
270 |       nodes[i].next = &nodes[i+1];
271 |    nodes[i].next = NULL;
272 |    context->init_mode = STBRP__INIT_skyline;
273 |    context->heuristic = STBRP_HEURISTIC_Skyline_default;
274 |    context->free_head = &nodes[0];
275 |    context->active_head = &context->extra[0];
276 |    context->width = width;
277 |    context->height = height;
278 |    context->num_nodes = num_nodes;
279 |    stbrp_setup_allow_out_of_mem(context, 0);
280 | 
281 |    // node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
282 |    context->extra[0].x = 0;
283 |    context->extra[0].y = 0;
284 |    context->extra[0].next = &context->extra[1];
285 |    context->extra[1].x = (stbrp_coord) width;
286 | #ifdef STBRP_LARGE_RECTS
287 |    context->extra[1].y = (1<<30);
288 | #else
289 |    context->extra[1].y = 65535;
290 | #endif
291 |    context->extra[1].next = NULL;
292 | }
293 | 
294 | // find minimum y position if it starts at x1
295 | static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
296 | {
297 |    stbrp_node *node = first;
298 |    int x1 = x0 + width;
299 |    int min_y, visited_width, waste_area;
300 | 
301 |    STBRP__NOTUSED(c);
302 | 
303 |    STBRP_ASSERT(first->x <= x0);
304 | 
305 |    #if 0
306 |    // skip in case we're past the node
307 |    while (node->next->x <= x0)
308 |       ++node;
309 |    #else
310 |    STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
311 |    #endif
312 | 
313 |    STBRP_ASSERT(node->x <= x0);
314 | 
315 |    min_y = 0;
316 |    waste_area = 0;
317 |    visited_width = 0;
318 |    while (node->x < x1) {
319 |       if (node->y > min_y) {
320 |          // raise min_y higher.
321 |          // we've accounted for all waste up to min_y,
322 |          // but we'll now add more waste for everything we've visted
323 |          waste_area += visited_width * (node->y - min_y);
324 |          min_y = node->y;
325 |          // the first time through, visited_width might be reduced
326 |          if (node->x < x0)
327 |             visited_width += node->next->x - x0;
328 |          else
329 |             visited_width += node->next->x - node->x;
330 |       } else {
331 |          // add waste area
332 |          int under_width = node->next->x - node->x;
333 |          if (under_width + visited_width > width)
334 |             under_width = width - visited_width;
335 |          waste_area += under_width * (min_y - node->y);
336 |          visited_width += under_width;
337 |       }
338 |       node = node->next;
339 |    }
340 | 
341 |    *pwaste = waste_area;
342 |    return min_y;
343 | }
344 | 
345 | typedef struct
346 | {
347 |    int x,y;
348 |    stbrp_node **prev_link;
349 | } stbrp__findresult;
350 | 
351 | static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
352 | {
353 |    int best_waste = (1<<30), best_x, best_y = (1 << 30);
354 |    stbrp__findresult fr;
355 |    stbrp_node **prev, *node, *tail, **best = NULL;
356 | 
357 |    // align to multiple of c->align
358 |    width = (width + c->align - 1);
359 |    width -= width % c->align;
360 |    STBRP_ASSERT(width % c->align == 0);
361 | 
362 |    // if it can't possibly fit, bail immediately
363 |    if (width > c->width || height > c->height) {
364 |       fr.prev_link = NULL;
365 |       fr.x = fr.y = 0;
366 |       return fr;
367 |    }
368 | 
369 |    node = c->active_head;
370 |    prev = &c->active_head;
371 |    while (node->x + width <= c->width) {
372 |       int y,waste;
373 |       y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
374 |       if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
375 |          // bottom left
376 |          if (y < best_y) {
377 |             best_y = y;
378 |             best = prev;
379 |          }
380 |       } else {
381 |          // best-fit
382 |          if (y + height <= c->height) {
383 |             // can only use it if it first vertically
384 |             if (y < best_y || (y == best_y && waste < best_waste)) {
385 |                best_y = y;
386 |                best_waste = waste;
387 |                best = prev;
388 |             }
389 |          }
390 |       }
391 |       prev = &node->next;
392 |       node = node->next;
393 |    }
394 | 
395 |    best_x = (best == NULL) ? 0 : (*best)->x;
396 | 
397 |    // if doing best-fit (BF), we also have to try aligning right edge to each node position
398 |    //
399 |    // e.g, if fitting
400 |    //
401 |    //     ____________________
402 |    //    |____________________|
403 |    //
404 |    //            into
405 |    //
406 |    //   |                         |
407 |    //   |             ____________|
408 |    //   |____________|
409 |    //
410 |    // then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
411 |    //
412 |    // This makes BF take about 2x the time
413 | 
414 |    if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
415 |       tail = c->active_head;
416 |       node = c->active_head;
417 |       prev = &c->active_head;
418 |       // find first node that's admissible
419 |       while (tail->x < width)
420 |          tail = tail->next;
421 |       while (tail) {
422 |          int xpos = tail->x - width;
423 |          int y,waste;
424 |          STBRP_ASSERT(xpos >= 0);
425 |          // find the left position that matches this
426 |          while (node->next->x <= xpos) {
427 |             prev = &node->next;
428 |             node = node->next;
429 |          }
430 |          STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
431 |          y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
432 |          if (y + height <= c->height) {
433 |             if (y <= best_y) {
434 |                if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
435 |                   best_x = xpos;
436 |                   STBRP_ASSERT(y <= best_y);
437 |                   best_y = y;
438 |                   best_waste = waste;
439 |                   best = prev;
440 |                }
441 |             }
442 |          }
443 |          tail = tail->next;
444 |       }         
445 |    }
446 | 
447 |    fr.prev_link = best;
448 |    fr.x = best_x;
449 |    fr.y = best_y;
450 |    return fr;
451 | }
452 | 
453 | static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
454 | {
455 |    // find best position according to heuristic
456 |    stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
457 |    stbrp_node *node, *cur;
458 | 
459 |    // bail if:
460 |    //    1. it failed
461 |    //    2. the best node doesn't fit (we don't always check this)
462 |    //    3. we're out of memory
463 |    if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
464 |       res.prev_link = NULL;
465 |       return res;
466 |    }
467 | 
468 |    // on success, create new node
469 |    node = context->free_head;
470 |    node->x = (stbrp_coord) res.x;
471 |    node->y = (stbrp_coord) (res.y + height);
472 | 
473 |    context->free_head = node->next;
474 | 
475 |    // insert the new node into the right starting point, and
476 |    // let 'cur' point to the remaining nodes needing to be
477 |    // stiched back in
478 | 
479 |    cur = *res.prev_link;
480 |    if (cur->x < res.x) {
481 |       // preserve the existing one, so start testing with the next one
482 |       stbrp_node *next = cur->next;
483 |       cur->next = node;
484 |       cur = next;
485 |    } else {
486 |       *res.prev_link = node;
487 |    }
488 | 
489 |    // from here, traverse cur and free the nodes, until we get to one
490 |    // that shouldn't be freed
491 |    while (cur->next && cur->next->x <= res.x + width) {
492 |       stbrp_node *next = cur->next;
493 |       // move the current node to the free list
494 |       cur->next = context->free_head;
495 |       context->free_head = cur;
496 |       cur = next;
497 |    }
498 | 
499 |    // stitch the list back in
500 |    node->next = cur;
501 | 
502 |    if (cur->x < res.x + width)
503 |       cur->x = (stbrp_coord) (res.x + width);
504 | 
505 | #ifdef _DEBUG
506 |    cur = context->active_head;
507 |    while (cur->x < context->width) {
508 |       STBRP_ASSERT(cur->x < cur->next->x);
509 |       cur = cur->next;
510 |    }
511 |    STBRP_ASSERT(cur->next == NULL);
512 | 
513 |    {
514 |       int count=0;
515 |       cur = context->active_head;
516 |       while (cur) {
517 |          cur = cur->next;
518 |          ++count;
519 |       }
520 |       cur = context->free_head;
521 |       while (cur) {
522 |          cur = cur->next;
523 |          ++count;
524 |       }
525 |       STBRP_ASSERT(count == context->num_nodes+2);
526 |    }
527 | #endif
528 | 
529 |    return res;
530 | }
531 | 
532 | // [DEAR IMGUI] Added STBRP__CDECL
533 | static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
534 | {
535 |    const stbrp_rect *p = (const stbrp_rect *) a;
536 |    const stbrp_rect *q = (const stbrp_rect *) b;
537 |    if (p->h > q->h)
538 |       return -1;
539 |    if (p->h < q->h)
540 |       return  1;
541 |    return (p->w > q->w) ? -1 : (p->w < q->w);
542 | }
543 | 
544 | // [DEAR IMGUI] Added STBRP__CDECL
545 | static int STBRP__CDECL rect_original_order(const void *a, const void *b)
546 | {
547 |    const stbrp_rect *p = (const stbrp_rect *) a;
548 |    const stbrp_rect *q = (const stbrp_rect *) b;
549 |    return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
550 | }
551 | 
552 | #ifdef STBRP_LARGE_RECTS
553 | #define STBRP__MAXVAL  0xffffffff
554 | #else
555 | #define STBRP__MAXVAL  0xffff
556 | #endif
557 | 
558 | STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
559 | {
560 |    int i, all_rects_packed = 1;
561 | 
562 |    // we use the 'was_packed' field internally to allow sorting/unsorting
563 |    for (i=0; i < num_rects; ++i) {
564 |       rects[i].was_packed = i;
565 |    }
566 | 
567 |    // sort according to heuristic
568 |    STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
569 | 
570 |    for (i=0; i < num_rects; ++i) {
571 |       if (rects[i].w == 0 || rects[i].h == 0) {
572 |          rects[i].x = rects[i].y = 0;  // empty rect needs no space
573 |       } else {
574 |          stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
575 |          if (fr.prev_link) {
576 |             rects[i].x = (stbrp_coord) fr.x;
577 |             rects[i].y = (stbrp_coord) fr.y;
578 |          } else {
579 |             rects[i].x = rects[i].y = STBRP__MAXVAL;
580 |          }
581 |       }
582 |    }
583 | 
584 |    // unsort
585 |    STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
586 | 
587 |    // set was_packed flags and all_rects_packed status
588 |    for (i=0; i < num_rects; ++i) {
589 |       rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
590 |       if (!rects[i].was_packed)
591 |          all_rects_packed = 0;
592 |    }
593 | 
594 |    // return the all_rects_packed status
595 |    return all_rects_packed;
596 | }
597 | #endif
598 | 
599 | /*
600 | ------------------------------------------------------------------------------
601 | This software is available under 2 licenses -- choose whichever you prefer.
602 | ------------------------------------------------------------------------------
603 | ALTERNATIVE A - MIT License
604 | Copyright (c) 2017 Sean Barrett
605 | Permission is hereby granted, free of charge, to any person obtaining a copy of 
606 | this software and associated documentation files (the "Software"), to deal in 
607 | the Software without restriction, including without limitation the rights to 
608 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 
609 | of the Software, and to permit persons to whom the Software is furnished to do 
610 | so, subject to the following conditions:
611 | The above copyright notice and this permission notice shall be included in all 
612 | copies or substantial portions of the Software.
613 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
614 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
615 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
616 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
617 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
618 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
619 | SOFTWARE.
620 | ------------------------------------------------------------------------------
621 | ALTERNATIVE B - Public Domain (www.unlicense.org)
622 | This is free and unencumbered software released into the public domain.
623 | Anyone is free to copy, modify, publish, use, compile, sell, or distribute this 
624 | software, either in source code form or as a compiled binary, for any purpose, 
625 | commercial or non-commercial, and by any means.
626 | In jurisdictions that recognize copyright laws, the author or authors of this 
627 | software dedicate any and all copyright interest in the software to the public 
628 | domain. We make this dedication for the benefit of the public at large and to 
629 | the detriment of our heirs and successors. We intend this dedication to be an 
630 | overt act of relinquishment in perpetuity of all present and future rights to 
631 | this software under copyright law.
632 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
633 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
634 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
635 | AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
636 | ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
637 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
638 | ------------------------------------------------------------------------------
639 | */
640 | 


--------------------------------------------------------------------------------
/src/renderer/imgui/imgui_impl_opengl3.cpp:
--------------------------------------------------------------------------------
  1 | // dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline
  2 | // - Desktop GL: 2.x 3.x 4.x
  3 | // - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
  4 | // This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
  5 | 
  6 | // Implemented features:
  7 | //  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
  8 | //  [x] Renderer: Desktop GL only: Support for large meshes (64k+ vertices) with 16-bit indices.
  9 | 
 10 | // You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 11 | // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
 12 | // Read online: https://github.com/ocornut/imgui/tree/master/docs
 13 | 
 14 | // CHANGELOG
 15 | // (minor and older changes stripped away, please see git history for details)
 16 | //  2021-05-19: OpenGL: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
 17 | //  2021-04-06: OpenGL: Don't try to read GL_CLIP_ORIGIN unless we're OpenGL 4.5 or greater.
 18 | //  2021-02-18: OpenGL: Change blending equation to preserve alpha in output buffer.
 19 | //  2021-01-03: OpenGL: Backup, setup and restore GL_STENCIL_TEST state.
 20 | //  2020-10-23: OpenGL: Backup, setup and restore GL_PRIMITIVE_RESTART state.
 21 | //  2020-10-15: OpenGL: Use glGetString(GL_VERSION) instead of glGetIntegerv(GL_MAJOR_VERSION, ...) when the later returns zero (e.g. Desktop GL 2.x)
 22 | //  2020-09-17: OpenGL: Fix to avoid compiling/calling glBindSampler() on ES or pre 3.3 context which have the defines set by a loader.
 23 | //  2020-07-10: OpenGL: Added support for glad2 OpenGL loader.
 24 | //  2020-05-08: OpenGL: Made default GLSL version 150 (instead of 130) on OSX.
 25 | //  2020-04-21: OpenGL: Fixed handling of glClipControl(GL_UPPER_LEFT) by inverting projection matrix.
 26 | //  2020-04-12: OpenGL: Fixed context version check mistakenly testing for 4.0+ instead of 3.2+ to enable ImGuiBackendFlags_RendererHasVtxOffset.
 27 | //  2020-03-24: OpenGL: Added support for glbinding 2.x OpenGL loader.
 28 | //  2020-01-07: OpenGL: Added support for glbinding 3.x OpenGL loader.
 29 | //  2019-10-25: OpenGL: Using a combination of GL define and runtime GL version to decide whether to use glDrawElementsBaseVertex(). Fix building with pre-3.2 GL loaders.
 30 | //  2019-09-22: OpenGL: Detect default GL loader using __has_include compiler facility.
 31 | //  2019-09-16: OpenGL: Tweak initialization code to allow application calling ImGui_ImplOpenGL3_CreateFontsTexture() before the first NewFrame() call.
 32 | //  2019-05-29: OpenGL: Desktop GL only: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 33 | //  2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 34 | //  2019-03-29: OpenGL: Not calling glBindBuffer more than necessary in the render loop.
 35 | //  2019-03-15: OpenGL: Added a GL call + comments in ImGui_ImplOpenGL3_Init() to detect uninitialized GL function loaders early.
 36 | //  2019-03-03: OpenGL: Fix support for ES 2.0 (WebGL 1.0).
 37 | //  2019-02-20: OpenGL: Fix for OSX not supporting OpenGL 4.5, we don't try to read GL_CLIP_ORIGIN even if defined by the headers/loader.
 38 | //  2019-02-11: OpenGL: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display.
 39 | //  2019-02-01: OpenGL: Using GLSL 410 shaders for any version over 410 (e.g. 430, 450).
 40 | //  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
 41 | //  2018-11-13: OpenGL: Support for GL 4.5's glClipControl(GL_UPPER_LEFT) / GL_CLIP_ORIGIN.
 42 | //  2018-08-29: OpenGL: Added support for more OpenGL loaders: glew and glad, with comments indicative that any loader can be used.
 43 | //  2018-08-09: OpenGL: Default to OpenGL ES 3 on iOS and Android. GLSL version default to "#version 300 ES".
 44 | //  2018-07-30: OpenGL: Support for GLSL 300 ES and 410 core. Fixes for Emscripten compilation.
 45 | //  2018-07-10: OpenGL: Support for more GLSL versions (based on the GLSL version string). Added error output when shaders fail to compile/link.
 46 | //  2018-06-08: Misc: Extracted imgui_impl_opengl3.cpp/.h away from the old combined GLFW/SDL+OpenGL3 examples.
 47 | //  2018-06-08: OpenGL: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
 48 | //  2018-05-25: OpenGL: Removed unnecessary backup/restore of GL_ELEMENT_ARRAY_BUFFER_BINDING since this is part of the VAO state.
 49 | //  2018-05-14: OpenGL: Making the call to glBindSampler() optional so 3.2 context won't fail if the function is a NULL pointer.
 50 | //  2018-03-06: OpenGL: Added const char* glsl_version parameter to ImGui_ImplOpenGL3_Init() so user can override the GLSL version e.g. "#version 150".
 51 | //  2018-02-23: OpenGL: Create the VAO in the render function so the setup can more easily be used with multiple shared GL context.
 52 | //  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplSdlGL3_RenderDrawData() in the .h file so you can call it yourself.
 53 | //  2018-01-07: OpenGL: Changed GLSL shader version from 330 to 150.
 54 | //  2017-09-01: OpenGL: Save and restore current bound sampler. Save and restore current polygon mode.
 55 | //  2017-05-01: OpenGL: Fixed save and restore of current blend func state.
 56 | //  2017-05-01: OpenGL: Fixed save and restore of current GL_ACTIVE_TEXTURE.
 57 | //  2016-09-05: OpenGL: Fixed save and restore of current scissor rectangle.
 58 | //  2016-07-29: OpenGL: Explicitly setting GL_UNPACK_ROW_LENGTH to reduce issues because SDL changes it. (#752)
 59 | 
 60 | //----------------------------------------
 61 | // OpenGL    GLSL      GLSL
 62 | // version   version   string
 63 | //----------------------------------------
 64 | //  2.0       110       "#version 110"
 65 | //  2.1       120       "#version 120"
 66 | //  3.0       130       "#version 130"
 67 | //  3.1       140       "#version 140"
 68 | //  3.2       150       "#version 150"
 69 | //  3.3       330       "#version 330 core"
 70 | //  4.0       400       "#version 400 core"
 71 | //  4.1       410       "#version 410 core"
 72 | //  4.2       420       "#version 410 core"
 73 | //  4.3       430       "#version 430 core"
 74 | //  ES 2.0    100       "#version 100"      = WebGL 1.0
 75 | //  ES 3.0    300       "#version 300 es"   = WebGL 2.0
 76 | //----------------------------------------
 77 | 
 78 | #if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
 79 | #define _CRT_SECURE_NO_WARNINGS
 80 | #endif
 81 | 
 82 | #include "imgui.h"
 83 | #include "imgui_impl_opengl3.h"
 84 | #include <stdio.h>
 85 | #if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier
 86 | #include <stddef.h>     // intptr_t
 87 | #else
 88 | #include <stdint.h>     // intptr_t
 89 | #endif
 90 | 
 91 | // GL includes
 92 | #if defined(IMGUI_IMPL_OPENGL_ES2)
 93 | #include <GLES2/gl2.h>
 94 | #elif defined(IMGUI_IMPL_OPENGL_ES3)
 95 | #if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV))
 96 | #include <OpenGLES/ES3/gl.h>    // Use GL ES 3
 97 | #else
 98 | #include <GLES3/gl3.h>          // Use GL ES 3
 99 | #endif
100 | #else
101 | // About Desktop OpenGL function loaders:
102 | //  Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
103 | //  Helper libraries are often used for this purpose! Here we are supporting a few common ones (gl3w, glew, glad).
104 | //  You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
105 | #if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
106 | #include <GL/gl3w.h>            // Needs to be initialized with gl3wInit() in user's code
107 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
108 | #include <GL/glew.h>            // Needs to be initialized with glewInit() in user's code.
109 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
110 | #include <glad/glad.h>          // Needs to be initialized with gladLoadGL() in user's code.
111 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
112 | #include <glad/gl.h>            // Needs to be initialized with gladLoadGL(...) or gladLoaderLoadGL() in user's code.
113 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
114 | #ifndef GLFW_INCLUDE_NONE
115 | #define GLFW_INCLUDE_NONE       // GLFW including OpenGL headers causes ambiguity or multiple definition errors.
116 | #endif
117 | #include <glbinding/Binding.h>  // Needs to be initialized with glbinding::Binding::initialize() in user's code.
118 | #include <glbinding/gl/gl.h>
119 | using namespace gl;
120 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
121 | #ifndef GLFW_INCLUDE_NONE
122 | #define GLFW_INCLUDE_NONE       // GLFW including OpenGL headers causes ambiguity or multiple definition errors.
123 | #endif
124 | #include <glbinding/glbinding.h>// Needs to be initialized with glbinding::initialize() in user's code.
125 | #include <glbinding/gl/gl.h>
126 | using namespace gl;
127 | #else
128 | #include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
129 | #endif
130 | #endif
131 | 
132 | // Desktop GL 3.2+ has glDrawElementsBaseVertex() which GL ES and WebGL don't have.
133 | #if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_2)
134 | #define IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
135 | #endif
136 | 
137 | // Desktop GL 3.3+ has glBindSampler()
138 | #if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_3)
139 | #define IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
140 | #endif
141 | 
142 | // Desktop GL 3.1+ has GL_PRIMITIVE_RESTART state
143 | #if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_1)
144 | #define IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
145 | #endif
146 | 
147 | // OpenGL Data
148 | static GLuint       g_GlVersion = 0;                // Extracted at runtime using GL_MAJOR_VERSION, GL_MINOR_VERSION queries (e.g. 320 for GL 3.2)
149 | static char         g_GlslVersionString[32] = "";   // Specified by user or detected based on compile time GL settings.
150 | static GLuint       g_FontTexture = 0;
151 | static GLuint       g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
152 | static GLint        g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0;                                // Uniforms location
153 | static GLuint       g_AttribLocationVtxPos = 0, g_AttribLocationVtxUV = 0, g_AttribLocationVtxColor = 0; // Vertex attributes location
154 | static unsigned int g_VboHandle = 0, g_ElementsHandle = 0;
155 | 
156 | // Functions
157 | bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
158 | {
159 |     // Query for GL version (e.g. 320 for GL 3.2)
160 | #if !defined(IMGUI_IMPL_OPENGL_ES2)
161 |     GLint major = 0;
162 |     GLint minor = 0;
163 |     glGetIntegerv(GL_MAJOR_VERSION, &major);
164 |     glGetIntegerv(GL_MINOR_VERSION, &minor);
165 |     if (major == 0 && minor == 0)
166 |     {
167 |         // Query GL_VERSION in desktop GL 2.x, the string will start with "<major>.<minor>"
168 |         const char* gl_version = (const char*)glGetString(GL_VERSION);
169 |         sscanf(gl_version, "%d.%d", &major, &minor);
170 |     }
171 |     g_GlVersion = (GLuint)(major * 100 + minor * 10);
172 | #else
173 |     g_GlVersion = 200; // GLES 2
174 | #endif
175 | 
176 |     // Setup backend capabilities flags
177 |     ImGuiIO& io = ImGui::GetIO();
178 |     io.BackendRendererName = "imgui_impl_opengl3";
179 | #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
180 |     if (g_GlVersion >= 320)
181 |         io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
182 | #endif
183 | 
184 |     // Store GLSL version string so we can refer to it later in case we recreate shaders.
185 |     // Note: GLSL version is NOT the same as GL version. Leave this to NULL if unsure.
186 | #if defined(IMGUI_IMPL_OPENGL_ES2)
187 |     if (glsl_version == NULL)
188 |         glsl_version = "#version 100";
189 | #elif defined(IMGUI_IMPL_OPENGL_ES3)
190 |     if (glsl_version == NULL)
191 |         glsl_version = "#version 300 es";
192 | #elif defined(__APPLE__)
193 |     if (glsl_version == NULL)
194 |         glsl_version = "#version 150";
195 | #else
196 |     if (glsl_version == NULL)
197 |         glsl_version = "#version 130";
198 | #endif
199 |     IM_ASSERT((int)strlen(glsl_version) + 2 < IM_ARRAYSIZE(g_GlslVersionString));
200 |     strcpy(g_GlslVersionString, glsl_version);
201 |     strcat(g_GlslVersionString, "\n");
202 | 
203 |     // Debugging construct to make it easily visible in the IDE and debugger which GL loader has been selected.
204 |     // The code actually never uses the 'gl_loader' variable! It is only here so you can read it!
205 |     // If auto-detection fails or doesn't select the same GL loader file as used by your application,
206 |     // you are likely to get a crash below.
207 |     // You can explicitly select a loader by using '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
208 |     const char* gl_loader = "Unknown";
209 |     IM_UNUSED(gl_loader);
210 | #if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
211 |     gl_loader = "GL3W";
212 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
213 |     gl_loader = "GLEW";
214 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
215 |     gl_loader = "GLAD";
216 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
217 |     gl_loader = "GLAD2";
218 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
219 |     gl_loader = "glbinding2";
220 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
221 |     gl_loader = "glbinding3";
222 | #elif defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
223 |     gl_loader = "custom";
224 | #else
225 |     gl_loader = "none";
226 | #endif
227 | 
228 |     // Make an arbitrary GL call (we don't actually need the result)
229 |     // IF YOU GET A CRASH HERE: it probably means that you haven't initialized the OpenGL function loader used by this code.
230 |     // Desktop OpenGL 3/4 need a function loader. See the IMGUI_IMPL_OPENGL_LOADER_xxx explanation above.
231 |     GLint current_texture;
232 |     glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_texture);
233 | 
234 |     return true;
235 | }
236 | 
237 | void    ImGui_ImplOpenGL3_Shutdown()
238 | {
239 |     ImGui_ImplOpenGL3_DestroyDeviceObjects();
240 | }
241 | 
242 | void    ImGui_ImplOpenGL3_NewFrame()
243 | {
244 |     if (!g_ShaderHandle)
245 |         ImGui_ImplOpenGL3_CreateDeviceObjects();
246 | }
247 | 
248 | static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height, GLuint vertex_array_object)
249 | {
250 |     // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, polygon fill
251 |     glEnable(GL_BLEND);
252 |     glBlendEquation(GL_FUNC_ADD);
253 |     glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
254 |     glDisable(GL_CULL_FACE);
255 |     glDisable(GL_DEPTH_TEST);
256 |     glDisable(GL_STENCIL_TEST);
257 |     glEnable(GL_SCISSOR_TEST);
258 | #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
259 |     if (g_GlVersion >= 310)
260 |         glDisable(GL_PRIMITIVE_RESTART);
261 | #endif
262 | #ifdef GL_POLYGON_MODE
263 |     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
264 | #endif
265 | 
266 |     // Support for GL 4.5 rarely used glClipControl(GL_UPPER_LEFT)
267 | #if defined(GL_CLIP_ORIGIN)
268 |     bool clip_origin_lower_left = true;
269 |     if (g_GlVersion >= 450)
270 |     {
271 |         GLenum current_clip_origin = 0; glGetIntegerv(GL_CLIP_ORIGIN, (GLint*)&current_clip_origin);
272 |         if (current_clip_origin == GL_UPPER_LEFT)
273 |             clip_origin_lower_left = false;
274 |     }
275 | #endif
276 | 
277 |     // Setup viewport, orthographic projection matrix
278 |     // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
279 |     glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height);
280 |     float L = draw_data->DisplayPos.x;
281 |     float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
282 |     float T = draw_data->DisplayPos.y;
283 |     float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
284 | #if defined(GL_CLIP_ORIGIN)
285 |     if (!clip_origin_lower_left) { float tmp = T; T = B; B = tmp; } // Swap top and bottom if origin is upper left
286 | #endif
287 |     const float ortho_projection[4][4] =
288 |     {
289 |         { 2.0f/(R-L),   0.0f,         0.0f,   0.0f },
290 |         { 0.0f,         2.0f/(T-B),   0.0f,   0.0f },
291 |         { 0.0f,         0.0f,        -1.0f,   0.0f },
292 |         { (R+L)/(L-R),  (T+B)/(B-T),  0.0f,   1.0f },
293 |     };
294 |     glUseProgram(g_ShaderHandle);
295 |     glUniform1i(g_AttribLocationTex, 0);
296 |     glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]);
297 | 
298 | #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
299 |     if (g_GlVersion >= 330)
300 |         glBindSampler(0, 0); // We use combined texture/sampler state. Applications using GL 3.3 may set that otherwise.
301 | #endif
302 | 
303 |     (void)vertex_array_object;
304 | #ifndef IMGUI_IMPL_OPENGL_ES2
305 |     glBindVertexArray(vertex_array_object);
306 | #endif
307 | 
308 |     // Bind vertex/index buffers and setup attributes for ImDrawVert
309 |     glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle);
310 |     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle);
311 |     glEnableVertexAttribArray(g_AttribLocationVtxPos);
312 |     glEnableVertexAttribArray(g_AttribLocationVtxUV);
313 |     glEnableVertexAttribArray(g_AttribLocationVtxColor);
314 |     glVertexAttribPointer(g_AttribLocationVtxPos,   2, GL_FLOAT,         GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, pos));
315 |     glVertexAttribPointer(g_AttribLocationVtxUV,    2, GL_FLOAT,         GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, uv));
316 |     glVertexAttribPointer(g_AttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, GL_TRUE,  sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, col));
317 | }
318 | 
319 | // OpenGL3 Render function.
320 | // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly.
321 | // This is in order to be able to run within an OpenGL engine that doesn't do so.
322 | void    ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
323 | {
324 |     // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
325 |     int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
326 |     int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
327 |     if (fb_width <= 0 || fb_height <= 0)
328 |         return;
329 | 
330 |     // Backup GL state
331 |     GLenum last_active_texture; glGetIntegerv(GL_ACTIVE_TEXTURE, (GLint*)&last_active_texture);
332 |     glActiveTexture(GL_TEXTURE0);
333 |     GLuint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, (GLint*)&last_program);
334 |     GLuint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, (GLint*)&last_texture);
335 | #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
336 |     GLuint last_sampler; if (g_GlVersion >= 330) { glGetIntegerv(GL_SAMPLER_BINDING, (GLint*)&last_sampler); } else { last_sampler = 0; }
337 | #endif
338 |     GLuint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, (GLint*)&last_array_buffer);
339 | #ifndef IMGUI_IMPL_OPENGL_ES2
340 |     GLuint last_vertex_array_object; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, (GLint*)&last_vertex_array_object);
341 | #endif
342 | #ifdef GL_POLYGON_MODE
343 |     GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
344 | #endif
345 |     GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
346 |     GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
347 |     GLenum last_blend_src_rgb; glGetIntegerv(GL_BLEND_SRC_RGB, (GLint*)&last_blend_src_rgb);
348 |     GLenum last_blend_dst_rgb; glGetIntegerv(GL_BLEND_DST_RGB, (GLint*)&last_blend_dst_rgb);
349 |     GLenum last_blend_src_alpha; glGetIntegerv(GL_BLEND_SRC_ALPHA, (GLint*)&last_blend_src_alpha);
350 |     GLenum last_blend_dst_alpha; glGetIntegerv(GL_BLEND_DST_ALPHA, (GLint*)&last_blend_dst_alpha);
351 |     GLenum last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, (GLint*)&last_blend_equation_rgb);
352 |     GLenum last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, (GLint*)&last_blend_equation_alpha);
353 |     GLboolean last_enable_blend = glIsEnabled(GL_BLEND);
354 |     GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE);
355 |     GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST);
356 |     GLboolean last_enable_stencil_test = glIsEnabled(GL_STENCIL_TEST);
357 |     GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST);
358 | #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
359 |     GLboolean last_enable_primitive_restart = (g_GlVersion >= 310) ? glIsEnabled(GL_PRIMITIVE_RESTART) : GL_FALSE;
360 | #endif
361 | 
362 |     // Setup desired GL state
363 |     // Recreate the VAO every time (this is to easily allow multiple GL contexts to be rendered to. VAO are not shared among GL contexts)
364 |     // The renderer would actually work without any VAO bound, but then our VertexAttrib calls would overwrite the default one currently bound.
365 |     GLuint vertex_array_object = 0;
366 | #ifndef IMGUI_IMPL_OPENGL_ES2
367 |     glGenVertexArrays(1, &vertex_array_object);
368 | #endif
369 |     ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
370 | 
371 |     // Will project scissor/clipping rectangles into framebuffer space
372 |     ImVec2 clip_off = draw_data->DisplayPos;         // (0,0) unless using multi-viewports
373 |     ImVec2 clip_scale = draw_data->FramebufferScale; // (1,1) unless using retina display which are often (2,2)
374 | 
375 |     // Render command lists
376 |     for (int n = 0; n < draw_data->CmdListsCount; n++)
377 |     {
378 |         const ImDrawList* cmd_list = draw_data->CmdLists[n];
379 | 
380 |         // Upload vertex/index buffers
381 |         glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.Size * (int)sizeof(ImDrawVert), (const GLvoid*)cmd_list->VtxBuffer.Data, GL_STREAM_DRAW);
382 |         glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.Size * (int)sizeof(ImDrawIdx), (const GLvoid*)cmd_list->IdxBuffer.Data, GL_STREAM_DRAW);
383 | 
384 |         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
385 |         {
386 |             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
387 |             if (pcmd->UserCallback != NULL)
388 |             {
389 |                 // User callback, registered via ImDrawList::AddCallback()
390 |                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
391 |                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
392 |                     ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
393 |                 else
394 |                     pcmd->UserCallback(cmd_list, pcmd);
395 |             }
396 |             else
397 |             {
398 |                 // Project scissor/clipping rectangles into framebuffer space
399 |                 ImVec4 clip_rect;
400 |                 clip_rect.x = (pcmd->ClipRect.x - clip_off.x) * clip_scale.x;
401 |                 clip_rect.y = (pcmd->ClipRect.y - clip_off.y) * clip_scale.y;
402 |                 clip_rect.z = (pcmd->ClipRect.z - clip_off.x) * clip_scale.x;
403 |                 clip_rect.w = (pcmd->ClipRect.w - clip_off.y) * clip_scale.y;
404 | 
405 |                 if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0f && clip_rect.w >= 0.0f)
406 |                 {
407 |                     // Apply scissor/clipping rectangle
408 |                     glScissor((int)clip_rect.x, (int)(fb_height - clip_rect.w), (int)(clip_rect.z - clip_rect.x), (int)(clip_rect.w - clip_rect.y));
409 | 
410 |                     // Bind texture, Draw
411 |                     glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->GetTexID());
412 | #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
413 |                     if (g_GlVersion >= 320)
414 |                         glDrawElementsBaseVertex(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)), (GLint)pcmd->VtxOffset);
415 |                     else
416 | #endif
417 |                     glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)));
418 |                 }
419 |             }
420 |         }
421 |     }
422 | 
423 |     // Destroy the temporary VAO
424 | #ifndef IMGUI_IMPL_OPENGL_ES2
425 |     glDeleteVertexArrays(1, &vertex_array_object);
426 | #endif
427 | 
428 |     // Restore modified GL state
429 |     glUseProgram(last_program);
430 |     glBindTexture(GL_TEXTURE_2D, last_texture);
431 | #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
432 |     if (g_GlVersion >= 330)
433 |         glBindSampler(0, last_sampler);
434 | #endif
435 |     glActiveTexture(last_active_texture);
436 | #ifndef IMGUI_IMPL_OPENGL_ES2
437 |     glBindVertexArray(last_vertex_array_object);
438 | #endif
439 |     glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
440 |     glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha);
441 |     glBlendFuncSeparate(last_blend_src_rgb, last_blend_dst_rgb, last_blend_src_alpha, last_blend_dst_alpha);
442 |     if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND);
443 |     if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE);
444 |     if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST);
445 |     if (last_enable_stencil_test) glEnable(GL_STENCIL_TEST); else glDisable(GL_STENCIL_TEST);
446 |     if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST);
447 | #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
448 |     if (g_GlVersion >= 310) { if (last_enable_primitive_restart) glEnable(GL_PRIMITIVE_RESTART); else glDisable(GL_PRIMITIVE_RESTART); }
449 | #endif
450 | 
451 | #ifdef GL_POLYGON_MODE
452 |     glPolygonMode(GL_FRONT_AND_BACK, (GLenum)last_polygon_mode[0]);
453 | #endif
454 |     glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
455 |     glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]);
456 | }
457 | 
458 | bool ImGui_ImplOpenGL3_CreateFontsTexture()
459 | {
460 |     // Build texture atlas
461 |     ImGuiIO& io = ImGui::GetIO();
462 |     unsigned char* pixels;
463 |     int width, height;
464 |     io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);   // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
465 | 
466 |     // Upload texture to graphics system
467 |     GLint last_texture;
468 |     glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
469 |     glGenTextures(1, &g_FontTexture);
470 |     glBindTexture(GL_TEXTURE_2D, g_FontTexture);
471 |     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
472 |     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
473 | #ifdef GL_UNPACK_ROW_LENGTH
474 |     glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
475 | #endif
476 |     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
477 | 
478 |     // Store our identifier
479 |     io.Fonts->SetTexID((ImTextureID)(intptr_t)g_FontTexture);
480 | 
481 |     // Restore state
482 |     glBindTexture(GL_TEXTURE_2D, last_texture);
483 | 
484 |     return true;
485 | }
486 | 
487 | void ImGui_ImplOpenGL3_DestroyFontsTexture()
488 | {
489 |     if (g_FontTexture)
490 |     {
491 |         ImGuiIO& io = ImGui::GetIO();
492 |         glDeleteTextures(1, &g_FontTexture);
493 |         io.Fonts->SetTexID(0);
494 |         g_FontTexture = 0;
495 |     }
496 | }
497 | 
498 | // If you get an error please report on github. You may try different GL context version or GLSL version. See GL<>GLSL version table at the top of this file.
499 | static bool CheckShader(GLuint handle, const char* desc)
500 | {
501 |     GLint status = 0, log_length = 0;
502 |     glGetShaderiv(handle, GL_COMPILE_STATUS, &status);
503 |     glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &log_length);
504 |     if ((GLboolean)status == GL_FALSE)
505 |         fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to compile %s!\n", desc);
506 |     if (log_length > 1)
507 |     {
508 |         ImVector<char> buf;
509 |         buf.resize((int)(log_length + 1));
510 |         glGetShaderInfoLog(handle, log_length, NULL, (GLchar*)buf.begin());
511 |         fprintf(stderr, "%s\n", buf.begin());
512 |     }
513 |     return (GLboolean)status == GL_TRUE;
514 | }
515 | 
516 | // If you get an error please report on GitHub. You may try different GL context version or GLSL version.
517 | static bool CheckProgram(GLuint handle, const char* desc)
518 | {
519 |     GLint status = 0, log_length = 0;
520 |     glGetProgramiv(handle, GL_LINK_STATUS, &status);
521 |     glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &log_length);
522 |     if ((GLboolean)status == GL_FALSE)
523 |         fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link %s! (with GLSL '%s')\n", desc, g_GlslVersionString);
524 |     if (log_length > 1)
525 |     {
526 |         ImVector<char> buf;
527 |         buf.resize((int)(log_length + 1));
528 |         glGetProgramInfoLog(handle, log_length, NULL, (GLchar*)buf.begin());
529 |         fprintf(stderr, "%s\n", buf.begin());
530 |     }
531 |     return (GLboolean)status == GL_TRUE;
532 | }
533 | 
534 | bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
535 | {
536 |     // Backup GL state
537 |     GLint last_texture, last_array_buffer;
538 |     glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
539 |     glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
540 | #ifndef IMGUI_IMPL_OPENGL_ES2
541 |     GLint last_vertex_array;
542 |     glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array);
543 | #endif
544 | 
545 |     // Parse GLSL version string
546 |     int glsl_version = 130;
547 |     sscanf(g_GlslVersionString, "#version %d", &glsl_version);
548 | 
549 |     const GLchar* vertex_shader_glsl_120 =
550 |         "uniform mat4 ProjMtx;\n"
551 |         "attribute vec2 Position;\n"
552 |         "attribute vec2 UV;\n"
553 |         "attribute vec4 Color;\n"
554 |         "varying vec2 Frag_UV;\n"
555 |         "varying vec4 Frag_Color;\n"
556 |         "void main()\n"
557 |         "{\n"
558 |         "    Frag_UV = UV;\n"
559 |         "    Frag_Color = Color;\n"
560 |         "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
561 |         "}\n";
562 | 
563 |     const GLchar* vertex_shader_glsl_130 =
564 |         "uniform mat4 ProjMtx;\n"
565 |         "in vec2 Position;\n"
566 |         "in vec2 UV;\n"
567 |         "in vec4 Color;\n"
568 |         "out vec2 Frag_UV;\n"
569 |         "out vec4 Frag_Color;\n"
570 |         "void main()\n"
571 |         "{\n"
572 |         "    Frag_UV = UV;\n"
573 |         "    Frag_Color = Color;\n"
574 |         "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
575 |         "}\n";
576 | 
577 |     const GLchar* vertex_shader_glsl_300_es =
578 |         "precision mediump float;\n"
579 |         "layout (location = 0) in vec2 Position;\n"
580 |         "layout (location = 1) in vec2 UV;\n"
581 |         "layout (location = 2) in vec4 Color;\n"
582 |         "uniform mat4 ProjMtx;\n"
583 |         "out vec2 Frag_UV;\n"
584 |         "out vec4 Frag_Color;\n"
585 |         "void main()\n"
586 |         "{\n"
587 |         "    Frag_UV = UV;\n"
588 |         "    Frag_Color = Color;\n"
589 |         "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
590 |         "}\n";
591 | 
592 |     const GLchar* vertex_shader_glsl_410_core =
593 |         "layout (location = 0) in vec2 Position;\n"
594 |         "layout (location = 1) in vec2 UV;\n"
595 |         "layout (location = 2) in vec4 Color;\n"
596 |         "uniform mat4 ProjMtx;\n"
597 |         "out vec2 Frag_UV;\n"
598 |         "out vec4 Frag_Color;\n"
599 |         "void main()\n"
600 |         "{\n"
601 |         "    Frag_UV = UV;\n"
602 |         "    Frag_Color = Color;\n"
603 |         "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
604 |         "}\n";
605 | 
606 |     const GLchar* fragment_shader_glsl_120 =
607 |         "#ifdef GL_ES\n"
608 |         "    precision mediump float;\n"
609 |         "#endif\n"
610 |         "uniform sampler2D Texture;\n"
611 |         "varying vec2 Frag_UV;\n"
612 |         "varying vec4 Frag_Color;\n"
613 |         "void main()\n"
614 |         "{\n"
615 |         "    gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st);\n"
616 |         "}\n";
617 | 
618 |     const GLchar* fragment_shader_glsl_130 =
619 |         "uniform sampler2D Texture;\n"
620 |         "in vec2 Frag_UV;\n"
621 |         "in vec4 Frag_Color;\n"
622 |         "out vec4 Out_Color;\n"
623 |         "void main()\n"
624 |         "{\n"
625 |         "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
626 |         "}\n";
627 | 
628 |     const GLchar* fragment_shader_glsl_300_es =
629 |         "precision mediump float;\n"
630 |         "uniform sampler2D Texture;\n"
631 |         "in vec2 Frag_UV;\n"
632 |         "in vec4 Frag_Color;\n"
633 |         "layout (location = 0) out vec4 Out_Color;\n"
634 |         "void main()\n"
635 |         "{\n"
636 |         "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
637 |         "}\n";
638 | 
639 |     const GLchar* fragment_shader_glsl_410_core =
640 |         "in vec2 Frag_UV;\n"
641 |         "in vec4 Frag_Color;\n"
642 |         "uniform sampler2D Texture;\n"
643 |         "layout (location = 0) out vec4 Out_Color;\n"
644 |         "void main()\n"
645 |         "{\n"
646 |         "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
647 |         "}\n";
648 | 
649 |     // Select shaders matching our GLSL versions
650 |     const GLchar* vertex_shader = NULL;
651 |     const GLchar* fragment_shader = NULL;
652 |     if (glsl_version < 130)
653 |     {
654 |         vertex_shader = vertex_shader_glsl_120;
655 |         fragment_shader = fragment_shader_glsl_120;
656 |     }
657 |     else if (glsl_version >= 410)
658 |     {
659 |         vertex_shader = vertex_shader_glsl_410_core;
660 |         fragment_shader = fragment_shader_glsl_410_core;
661 |     }
662 |     else if (glsl_version == 300)
663 |     {
664 |         vertex_shader = vertex_shader_glsl_300_es;
665 |         fragment_shader = fragment_shader_glsl_300_es;
666 |     }
667 |     else
668 |     {
669 |         vertex_shader = vertex_shader_glsl_130;
670 |         fragment_shader = fragment_shader_glsl_130;
671 |     }
672 | 
673 |     // Create shaders
674 |     const GLchar* vertex_shader_with_version[2] = { g_GlslVersionString, vertex_shader };
675 |     g_VertHandle = glCreateShader(GL_VERTEX_SHADER);
676 |     glShaderSource(g_VertHandle, 2, vertex_shader_with_version, NULL);
677 |     glCompileShader(g_VertHandle);
678 |     CheckShader(g_VertHandle, "vertex shader");
679 | 
680 |     const GLchar* fragment_shader_with_version[2] = { g_GlslVersionString, fragment_shader };
681 |     g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER);
682 |     glShaderSource(g_FragHandle, 2, fragment_shader_with_version, NULL);
683 |     glCompileShader(g_FragHandle);
684 |     CheckShader(g_FragHandle, "fragment shader");
685 | 
686 |     g_ShaderHandle = glCreateProgram();
687 |     glAttachShader(g_ShaderHandle, g_VertHandle);
688 |     glAttachShader(g_ShaderHandle, g_FragHandle);
689 |     glLinkProgram(g_ShaderHandle);
690 |     CheckProgram(g_ShaderHandle, "shader program");
691 | 
692 |     g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture");
693 |     g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx");
694 |     g_AttribLocationVtxPos = (GLuint)glGetAttribLocation(g_ShaderHandle, "Position");
695 |     g_AttribLocationVtxUV = (GLuint)glGetAttribLocation(g_ShaderHandle, "UV");
696 |     g_AttribLocationVtxColor = (GLuint)glGetAttribLocation(g_ShaderHandle, "Color");
697 | 
698 |     // Create buffers
699 |     glGenBuffers(1, &g_VboHandle);
700 |     glGenBuffers(1, &g_ElementsHandle);
701 | 
702 |     ImGui_ImplOpenGL3_CreateFontsTexture();
703 | 
704 |     // Restore modified GL state
705 |     glBindTexture(GL_TEXTURE_2D, last_texture);
706 |     glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
707 | #ifndef IMGUI_IMPL_OPENGL_ES2
708 |     glBindVertexArray(last_vertex_array);
709 | #endif
710 | 
711 |     return true;
712 | }
713 | 
714 | void    ImGui_ImplOpenGL3_DestroyDeviceObjects()
715 | {
716 |     if (g_VboHandle)        { glDeleteBuffers(1, &g_VboHandle); g_VboHandle = 0; }
717 |     if (g_ElementsHandle)   { glDeleteBuffers(1, &g_ElementsHandle); g_ElementsHandle = 0; }
718 |     if (g_ShaderHandle && g_VertHandle) { glDetachShader(g_ShaderHandle, g_VertHandle); }
719 |     if (g_ShaderHandle && g_FragHandle) { glDetachShader(g_ShaderHandle, g_FragHandle); }
720 |     if (g_VertHandle)       { glDeleteShader(g_VertHandle); g_VertHandle = 0; }
721 |     if (g_FragHandle)       { glDeleteShader(g_FragHandle); g_FragHandle = 0; }
722 |     if (g_ShaderHandle)     { glDeleteProgram(g_ShaderHandle); g_ShaderHandle = 0; }
723 | 
724 |     ImGui_ImplOpenGL3_DestroyFontsTexture();
725 | }
726 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
  1 |                     GNU GENERAL PUBLIC LICENSE
  2 |                        Version 3, 29 June 2007
  3 | 
  4 |  Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  5 |  Everyone is permitted to copy and distribute verbatim copies
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243 | parts of the aggregate.
244 | 
245 |   6. Conveying Non-Source Forms.
246 | 
247 |   You may convey a covered work in object code form under the terms
248 | of sections 4 and 5, provided that you also convey the
249 | machine-readable Corresponding Source under the terms of this License,
250 | in one of these ways:
251 | 
252 |     a) Convey the object code in, or embodied in, a physical product
253 |     (including a physical distribution medium), accompanied by the
254 |     Corresponding Source fixed on a durable physical medium
255 |     customarily used for software interchange.
256 | 
257 |     b) Convey the object code in, or embodied in, a physical product
258 |     (including a physical distribution medium), accompanied by a
259 |     written offer, valid for at least three years and valid for as
260 |     long as you offer spare parts or customer support for that product
261 |     model, to give anyone who possesses the object code either (1) a
262 |     copy of the Corresponding Source for all the software in the
263 |     product that is covered by this License, on a durable physical
264 |     medium customarily used for software interchange, for a price no
265 |     more than your reasonable cost of physically performing this
266 |     conveying of source, or (2) access to copy the
267 |     Corresponding Source from a network server at no charge.
268 | 
269 |     c) Convey individual copies of the object code with a copy of the
270 |     written offer to provide the Corresponding Source.  This
271 |     alternative is allowed only occasionally and noncommercially, and
272 |     only if you received the object code with such an offer, in accord
273 |     with subsection 6b.
274 | 
275 |     d) Convey the object code by offering access from a designated
276 |     place (gratis or for a charge), and offer equivalent access to the
277 |     Corresponding Source in the same way through the same place at no
278 |     further charge.  You need not require recipients to copy the
279 |     Corresponding Source along with the object code.  If the place to
280 |     copy the object code is a network server, the Corresponding Source
281 |     may be on a different server (operated by you or a third party)
282 |     that supports equivalent copying facilities, provided you maintain
283 |     clear directions next to the object code saying where to find the
284 |     Corresponding Source.  Regardless of what server hosts the
285 |     Corresponding Source, you remain obligated to ensure that it is
286 |     available for as long as needed to satisfy these requirements.
287 | 
288 |     e) Convey the object code using peer-to-peer transmission, provided
289 |     you inform other peers where the object code and Corresponding
290 |     Source of the work are being offered to the general public at no
291 |     charge under subsection 6d.
292 | 
293 |   A separable portion of the object code, whose source code is excluded
294 | from the Corresponding Source as a System Library, need not be
295 | included in conveying the object code work.
296 | 
297 |   A "User Product" is either (1) a "consumer product", which means any
298 | tangible personal property which is normally used for personal, family,
299 | or household purposes, or (2) anything designed or sold for incorporation
300 | into a dwelling.  In determining whether a product is a consumer product,
301 | doubtful cases shall be resolved in favor of coverage.  For a particular
302 | product received by a particular user, "normally used" refers to a
303 | typical or common use of that class of product, regardless of the status
304 | of the particular user or of the way in which the particular user
305 | actually uses, or expects or is expected to use, the product.  A product
306 | is a consumer product regardless of whether the product has substantial
307 | commercial, industrial or non-consumer uses, unless such uses represent
308 | the only significant mode of use of the product.
309 | 
310 |   "Installation Information" for a User Product means any methods,
311 | procedures, authorization keys, or other information required to install
312 | and execute modified versions of a covered work in that User Product from
313 | a modified version of its Corresponding Source.  The information must
314 | suffice to ensure that the continued functioning of the modified object
315 | code is in no case prevented or interfered with solely because
316 | modification has been made.
317 | 
318 |   If you convey an object code work under this section in, or with, or
319 | specifically for use in, a User Product, and the conveying occurs as
320 | part of a transaction in which the right of possession and use of the
321 | User Product is transferred to the recipient in perpetuity or for a
322 | fixed term (regardless of how the transaction is characterized), the
323 | Corresponding Source conveyed under this section must be accompanied
324 | by the Installation Information.  But this requirement does not apply
325 | if neither you nor any third party retains the ability to install
326 | modified object code on the User Product (for example, the work has
327 | been installed in ROM).
328 | 
329 |   The requirement to provide Installation Information does not include a
330 | requirement to continue to provide support service, warranty, or updates
331 | for a work that has been modified or installed by the recipient, or for
332 | the User Product in which it has been modified or installed.  Access to a
333 | network may be denied when the modification itself materially and
334 | adversely affects the operation of the network or violates the rules and
335 | protocols for communication across the network.
336 | 
337 |   Corresponding Source conveyed, and Installation Information provided,
338 | in accord with this section must be in a format that is publicly
339 | documented (and with an implementation available to the public in
340 | source code form), and must require no special password or key for
341 | unpacking, reading or copying.
342 | 
343 |   7. Additional Terms.
344 | 
345 |   "Additional permissions" are terms that supplement the terms of this
346 | License by making exceptions from one or more of its conditions.
347 | Additional permissions that are applicable to the entire Program shall
348 | be treated as though they were included in this License, to the extent
349 | that they are valid under applicable law.  If additional permissions
350 | apply only to part of the Program, that part may be used separately
351 | under those permissions, but the entire Program remains governed by
352 | this License without regard to the additional permissions.
353 | 
354 |   When you convey a copy of a covered work, you may at your option
355 | remove any additional permissions from that copy, or from any part of
356 | it.  (Additional permissions may be written to require their own
357 | removal in certain cases when you modify the work.)  You may place
358 | additional permissions on material, added by you to a covered work,
359 | for which you have or can give appropriate copyright permission.
360 | 
361 |   Notwithstanding any other provision of this License, for material you
362 | add to a covered work, you may (if authorized by the copyright holders of
363 | that material) supplement the terms of this License with terms:
364 | 
365 |     a) Disclaiming warranty or limiting liability differently from the
366 |     terms of sections 15 and 16 of this License; or
367 | 
368 |     b) Requiring preservation of specified reasonable legal notices or
369 |     author attributions in that material or in the Appropriate Legal
370 |     Notices displayed by works containing it; or
371 | 
372 |     c) Prohibiting misrepresentation of the origin of that material, or
373 |     requiring that modified versions of such material be marked in
374 |     reasonable ways as different from the original version; or
375 | 
376 |     d) Limiting the use for publicity purposes of names of licensors or
377 |     authors of the material; or
378 | 
379 |     e) Declining to grant rights under trademark law for use of some
380 |     trade names, trademarks, or service marks; or
381 | 
382 |     f) Requiring indemnification of licensors and authors of that
383 |     material by anyone who conveys the material (or modified versions of
384 |     it) with contractual assumptions of liability to the recipient, for
385 |     any liability that these contractual assumptions directly impose on
386 |     those licensors and authors.
387 | 
388 |   All other non-permissive additional terms are considered "further
389 | restrictions" within the meaning of section 10.  If the Program as you
390 | received it, or any part of it, contains a notice stating that it is
391 | governed by this License along with a term that is a further
392 | restriction, you may remove that term.  If a license document contains
393 | a further restriction but permits relicensing or conveying under this
394 | License, you may add to a covered work material governed by the terms
395 | of that license document, provided that the further restriction does
396 | not survive such relicensing or conveying.
397 | 
398 |   If you add terms to a covered work in accord with this section, you
399 | must place, in the relevant source files, a statement of the
400 | additional terms that apply to those files, or a notice indicating
401 | where to find the applicable terms.
402 | 
403 |   Additional terms, permissive or non-permissive, may be stated in the
404 | form of a separately written license, or stated as exceptions;
405 | the above requirements apply either way.
406 | 
407 |   8. Termination.
408 | 
409 |   You may not propagate or modify a covered work except as expressly
410 | provided under this License.  Any attempt otherwise to propagate or
411 | modify it is void, and will automatically terminate your rights under
412 | this License (including any patent licenses granted under the third
413 | paragraph of section 11).
414 | 
415 |   However, if you cease all violation of this License, then your
416 | license from a particular copyright holder is reinstated (a)
417 | provisionally, unless and until the copyright holder explicitly and
418 | finally terminates your license, and (b) permanently, if the copyright
419 | holder fails to notify you of the violation by some reasonable means
420 | prior to 60 days after the cessation.
421 | 
422 |   Moreover, your license from a particular copyright holder is
423 | reinstated permanently if the copyright holder notifies you of the
424 | violation by some reasonable means, this is the first time you have
425 | received notice of violation of this License (for any work) from that
426 | copyright holder, and you cure the violation prior to 30 days after
427 | your receipt of the notice.
428 | 
429 |   Termination of your rights under this section does not terminate the
430 | licenses of parties who have received copies or rights from you under
431 | this License.  If your rights have been terminated and not permanently
432 | reinstated, you do not qualify to receive new licenses for the same
433 | material under section 10.
434 | 
435 |   9. Acceptance Not Required for Having Copies.
436 | 
437 |   You are not required to accept this License in order to receive or
438 | run a copy of the Program.  Ancillary propagation of a covered work
439 | occurring solely as a consequence of using peer-to-peer transmission
440 | to receive a copy likewise does not require acceptance.  However,
441 | nothing other than this License grants you permission to propagate or
442 | modify any covered work.  These actions infringe copyright if you do
443 | not accept this License.  Therefore, by modifying or propagating a
444 | covered work, you indicate your acceptance of this License to do so.
445 | 
446 |   10. Automatic Licensing of Downstream Recipients.
447 | 
448 |   Each time you convey a covered work, the recipient automatically
449 | receives a license from the original licensors, to run, modify and
450 | propagate that work, subject to this License.  You are not responsible
451 | for enforcing compliance by third parties with this License.
452 | 
453 |   An "entity transaction" is a transaction transferring control of an
454 | organization, or substantially all assets of one, or subdividing an
455 | organization, or merging organizations.  If propagation of a covered
456 | work results from an entity transaction, each party to that
457 | transaction who receives a copy of the work also receives whatever
458 | licenses to the work the party's predecessor in interest had or could
459 | give under the previous paragraph, plus a right to possession of the
460 | Corresponding Source of the work from the predecessor in interest, if
461 | the predecessor has it or can get it with reasonable efforts.
462 | 
463 |   You may not impose any further restrictions on the exercise of the
464 | rights granted or affirmed under this License.  For example, you may
465 | not impose a license fee, royalty, or other charge for exercise of
466 | rights granted under this License, and you may not initiate litigation
467 | (including a cross-claim or counterclaim in a lawsuit) alleging that
468 | any patent claim is infringed by making, using, selling, offering for
469 | sale, or importing the Program or any portion of it.
470 | 
471 |   11. Patents.
472 | 
473 |   A "contributor" is a copyright holder who authorizes use under this
474 | License of the Program or a work on which the Program is based.  The
475 | work thus licensed is called the contributor's "contributor version".
476 | 
477 |   A contributor's "essential patent claims" are all patent claims
478 | owned or controlled by the contributor, whether already acquired or
479 | hereafter acquired, that would be infringed by some manner, permitted
480 | by this License, of making, using, or selling its contributor version,
481 | but do not include claims that would be infringed only as a
482 | consequence of further modification of the contributor version.  For
483 | purposes of this definition, "control" includes the right to grant
484 | patent sublicenses in a manner consistent with the requirements of
485 | this License.
486 | 
487 |   Each contributor grants you a non-exclusive, worldwide, royalty-free
488 | patent license under the contributor's essential patent claims, to
489 | make, use, sell, offer for sale, import and otherwise run, modify and
490 | propagate the contents of its contributor version.
491 | 
492 |   In the following three paragraphs, a "patent license" is any express
493 | agreement or commitment, however denominated, not to enforce a patent
494 | (such as an express permission to practice a patent or covenant not to
495 | sue for patent infringement).  To "grant" such a patent license to a
496 | party means to make such an agreement or commitment not to enforce a
497 | patent against the party.
498 | 
499 |   If you convey a covered work, knowingly relying on a patent license,
500 | and the Corresponding Source of the work is not available for anyone
501 | to copy, free of charge and under the terms of this License, through a
502 | publicly available network server or other readily accessible means,
503 | then you must either (1) cause the Corresponding Source to be so
504 | available, or (2) arrange to deprive yourself of the benefit of the
505 | patent license for this particular work, or (3) arrange, in a manner
506 | consistent with the requirements of this License, to extend the patent
507 | license to downstream recipients.  "Knowingly relying" means you have
508 | actual knowledge that, but for the patent license, your conveying the
509 | covered work in a country, or your recipient's use of the covered work
510 | in a country, would infringe one or more identifiable patents in that
511 | country that you have reason to believe are valid.
512 | 
513 |   If, pursuant to or in connection with a single transaction or
514 | arrangement, you convey, or propagate by procuring conveyance of, a
515 | covered work, and grant a patent license to some of the parties
516 | receiving the covered work authorizing them to use, propagate, modify
517 | or convey a specific copy of the covered work, then the patent license
518 | you grant is automatically extended to all recipients of the covered
519 | work and works based on it.
520 | 
521 |   A patent license is "discriminatory" if it does not include within
522 | the scope of its coverage, prohibits the exercise of, or is
523 | conditioned on the non-exercise of one or more of the rights that are
524 | specifically granted under this License.  You may not convey a covered
525 | work if you are a party to an arrangement with a third party that is
526 | in the business of distributing software, under which you make payment
527 | to the third party based on the extent of your activity of conveying
528 | the work, and under which the third party grants, to any of the
529 | parties who would receive the covered work from you, a discriminatory
530 | patent license (a) in connection with copies of the covered work
531 | conveyed by you (or copies made from those copies), or (b) primarily
532 | for and in connection with specific products or compilations that
533 | contain the covered work, unless you entered into that arrangement,
534 | or that patent license was granted, prior to 28 March 2007.
535 | 
536 |   Nothing in this License shall be construed as excluding or limiting
537 | any implied license or other defenses to infringement that may
538 | otherwise be available to you under applicable patent law.
539 | 
540 |   12. No Surrender of Others' Freedom.
541 | 
542 |   If conditions are imposed on you (whether by court order, agreement or
543 | otherwise) that contradict the conditions of this License, they do not
544 | excuse you from the conditions of this License.  If you cannot convey a
545 | covered work so as to satisfy simultaneously your obligations under this
546 | License and any other pertinent obligations, then as a consequence you may
547 | not convey it at all.  For example, if you agree to terms that obligate you
548 | to collect a royalty for further conveying from those to whom you convey
549 | the Program, the only way you could satisfy both those terms and this
550 | License would be to refrain entirely from conveying the Program.
551 | 
552 |   13. Use with the GNU Affero General Public License.
553 | 
554 |   Notwithstanding any other provision of this License, you have
555 | permission to link or combine any covered work with a work licensed
556 | under version 3 of the GNU Affero General Public License into a single
557 | combined work, and to convey the resulting work.  The terms of this
558 | License will continue to apply to the part which is the covered work,
559 | but the special requirements of the GNU Affero General Public License,
560 | section 13, concerning interaction through a network will apply to the
561 | combination as such.
562 | 
563 |   14. Revised Versions of this License.
564 | 
565 |   The Free Software Foundation may publish revised and/or new versions of
566 | the GNU General Public License from time to time.  Such new versions will
567 | be similar in spirit to the present version, but may differ in detail to
568 | address new problems or concerns.
569 | 
570 |   Each version is given a distinguishing version number.  If the
571 | Program specifies that a certain numbered version of the GNU General
572 | Public License "or any later version" applies to it, you have the
573 | option of following the terms and conditions either of that numbered
574 | version or of any later version published by the Free Software
575 | Foundation.  If the Program does not specify a version number of the
576 | GNU General Public License, you may choose any version ever published
577 | by the Free Software Foundation.
578 | 
579 |   If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 | 
584 |   Later license versions may give you additional or different
585 | permissions.  However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 | 
589 |   15. Disclaimer of Warranty.
590 | 
591 |   THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 | 
600 |   16. Limitation of Liability.
601 | 
602 |   IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 | 
612 |   17. Interpretation of Sections 15 and 16.
613 | 
614 |   If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 | 
621 |                      END OF TERMS AND CONDITIONS
622 | 
623 |             How to Apply These Terms to Your New Programs
624 | 
625 |   If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 | 
629 |   To do so, attach the following notices to the program.  It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 | 
634 |     <one line to give the program's name and a brief idea of what it does.>
635 |     Copyright (C) <year>  <name of author>
636 | 
637 |     This program is free software: you can redistribute it and/or modify
638 |     it under the terms of the GNU General Public License as published by
639 |     the Free Software Foundation, either version 3 of the License, or
640 |     (at your option) any later version.
641 | 
642 |     This program is distributed in the hope that it will be useful,
643 |     but WITHOUT ANY WARRANTY; without even the implied warranty of
644 |     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
645 |     GNU General Public License for more details.
646 | 
647 |     You should have received a copy of the GNU General Public License
648 |     along with this program.  If not, see <https://www.gnu.org/licenses/>.
649 | 
650 | Also add information on how to contact you by electronic and paper mail.
651 | 
652 |   If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 | 
655 |     <program>  Copyright (C) <year>  <name of author>
656 |     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 |     This is free software, and you are welcome to redistribute it
658 |     under certain conditions; type `show c' for details.
659 | 
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License.  Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 | 
664 |   You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | <https://www.gnu.org/licenses/>.
668 | 
669 |   The GNU General Public License does not permit incorporating your program
670 | into proprietary programs.  If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library.  If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License.  But first, please read
674 | <https://www.gnu.org/licenses/why-not-lgpl.html>.
675 | 


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