├── .gitignore
├── .gitmodules
├── .npmignore
├── .nvmrc
├── Makefile.common
├── Makefile.gambatte
├── Makefile.vbanext
├── README.md
├── dist
    ├── archjs-gambatte.js
    └── archjs-vbanext.js
├── example
    ├── index.html
    ├── main.js
    └── vendors
    │   ├── CoreJs-0.9.6.min.js
    │   └── FpsMeter-0.3.1.min.js
├── includes
    └── libretro.h
├── package.json
└── sources
    ├── bridge_retro.c
    ├── bridge_retro.h
    ├── bridge_virtjs.c
    ├── bridge_virtjs.h
    ├── bridge_virtjs.js
    ├── epilogue.js
    ├── frontend.c
    ├── frontend.h
    ├── input_formats.c
    ├── input_formats.h
    ├── main.c
    └── prologue.js


/.gitignore:
--------------------------------------------------------------------------------
 1 | /dist/archjs-gambatte
 2 | /dist/archjs-vbanext
 3 | 
 4 | .#*
 5 | *.o
 6 | *.tmp
 7 | 
 8 | *.a
 9 | *.bc
10 | 
11 | *.gb
12 | *.gbc
13 | *.gba
14 | *.sav
15 | 


--------------------------------------------------------------------------------
/.gitmodules:
--------------------------------------------------------------------------------
1 | [submodule "example/virtjs"]
2 | 	path = example/virtjs
3 | 	url = https://github.com/arcanis/virtjs.git
4 | [submodule "example/taisel"]
5 | 	path = example/taisel
6 | 	url = https://github.com/start9/taisel.git
7 | 


--------------------------------------------------------------------------------
/.npmignore:
--------------------------------------------------------------------------------
1 | /example/
2 | /includes/
3 | /sources/
4 | /systems/
5 | 
6 | /Makefile.*
7 | 


--------------------------------------------------------------------------------
/.nvmrc:
--------------------------------------------------------------------------------
1 | node
2 | 


--------------------------------------------------------------------------------
/Makefile.common:
--------------------------------------------------------------------------------
  1 | ifndef ENGINE_NAME
  2 |   $(error "You need to define the engine architecture")
  3 | endif
  4 | 
  5 | ifndef ENGINE_ROM_NAME
  6 |   $(error "You need to define the engine default rom name")
  7 | endif
  8 | 
  9 | SHELL = bash
 10 | 
 11 | CFLAGS = -std=c99
 12 | 
 13 | CPPFLAGS += -W -Wall -Werror -Wno-unused-parameter
 14 | CPPFLAGS += -I $(shell pwd)/includes
 15 | 
 16 | ifdef EMMAKEN_COMPILER
 17 | 
 18 |     MEMORY = $$((64*1024*1024))
 19 | 
 20 |     TARGET = dist/archjs-$(ENGINE_NAME).js
 21 | 
 22 |     SOURCES = \
 23 |       systems/libretro-$(ENGINE_NAME).bc \
 24 |       sources/bridge_retro.c.o \
 25 |       sources/bridge_virtjs.js \
 26 |       sources/frontend.c.o \
 27 |       sources/input_formats.c.o \
 28 |       sources/main.c.o
 29 | 
 30 |     EXTRA_SOURCES = \
 31 |       sources/prologue.js \
 32 |       sources/epilogue.js \
 33 |       Makefile.$(ENGINE_NAME) \
 34 |       Makefile.common
 35 | 
 36 |     LDFLAGS += --memory-init-file 0
 37 |     LDFLAGS += -s NO_EXIT_RUNTIME=1 -s INVOKE_RUN=0 -s TOTAL_MEMORY=$(MEMORY)
 38 | 
 39 | else
 40 | 
 41 |     TARGET = dist/archjs-$(ENGINE_NAME)
 42 | 
 43 |     SOURCES = \
 44 |       sources/bridge_retro.c.o \
 45 |       sources/bridge_virtjs.c.o \
 46 |       sources/frontend.c.o \
 47 |       sources/input_formats.c.o \
 48 |       sources/main.c.o
 49 | 
 50 |     EXTRA_SOURCES = \
 51 |       systems/libretro-$(ENGINE_NAME).so \
 52 |       Makefile.$(ENGINE_NAME) \
 53 |       Makefile.common
 54 | 
 55 |     CPPFLAGS += $(shell pkg-config --cflags sdl2)
 56 | 
 57 |     LDFLAGS += -L systems -lretro-$(ENGINE_NAME)
 58 |     LDFLAGS += $(shell pkg-config --libs sdl2)
 59 | 
 60 | endif
 61 | 
 62 | ifdef DEBUG
 63 | 
 64 |     CPPFLAGS += -g
 65 | 
 66 | else
 67 | 
 68 |     CPPFLAGS += -O3
 69 |     LDFLAGS += -O3
 70 | 
 71 |     ifdef EMMAKEN_COMPILER
 72 |         LDFLAGS += --llvm-lto 3 -s OUTLINING_LIMIT=50000 -s PRECISE_F32=2
 73 |     endif
 74 | 
 75 | endif
 76 | 
 77 | all: $(TARGET)
 78 | 
 79 | $(TARGET): $(SOURCES) $(EXTRA_SOURCES)
 80 | 	$(CXX) -o $(TARGET) $(filter-out %.js, $(SOURCES)) $(addprefix --js-library , $(filter %.js, $(SOURCES))) $(LDFLAGS)
 81 | ifdef EMMAKEN_COMPILER
 82 | 	cat sources/prologue.js | sed -e 's/@(ENGINE_NAME)/$(ENGINE_NAME)/g' -e 's/@(ENGINE_ROM_NAME)/$(ENGINE_ROM_NAME)/' > $(TARGET).tmp
 83 | 	cat $(TARGET) >> $(TARGET).tmp
 84 | 	cat sources/epilogue.js | sed -e 's/@(ENGINE_NAME)/$(ENGINE_NAME)/g' -e 's/@(ENGINE_ROM_NAME)/$(ENGINE_ROM_NAME)/' >> $(TARGET).tmp
 85 | 	mv $(TARGET).tmp $(TARGET)
 86 | endif
 87 | 
 88 | %.c.o: %.c Makefile.$(ENGINE_NAME) Makefile.common
 89 | 	$(CC) -c -o $(@) $(<) $(CFLAGS) $(CPPFLAGS)
 90 | 
 91 | clean:
 92 | 	@$(RM) -f **/*.o
 93 | 	@$(RM) -f **/*.tmp
 94 | 
 95 | fclean: clean
 96 | 	@$(RM) -f $(TARGET)
 97 | 
 98 | re: clean all
 99 | 
100 | .PHONY: all clean re
101 | 


--------------------------------------------------------------------------------
/Makefile.gambatte:
--------------------------------------------------------------------------------
1 | ENGINE_NAME=gambatte
2 | ENGINE_ROM_NAME=game.gb
3 | 
4 | include Makefile.common
5 | 


--------------------------------------------------------------------------------
/Makefile.vbanext:
--------------------------------------------------------------------------------
1 | ENGINE_NAME=vbanext
2 | ENGINE_ROM_NAME=game.gba
3 | 
4 | include Makefile.common
5 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Archjs
 2 | 
 3 | Archjs is a [Libretro](http://www.libretro.com/) frontend dedicated to one specific purpose : being easily compiled to Javascript using [Emscripten](http://kripken.github.io/emscripten-site/).
 4 | 
 5 | Once compiled to Javascript, the scripts export [Virtjs](http://virtjs.com/) engines (available in the `Archjs` global), which can then be instanciated just like any other engine ([documentation here](http://virtjs.com/documentation/instanciating-an-emulator/)).
 6 | 
 7 | ## Supported cores
 8 | 
 9 | Since we're only a libretro frontend, we should work with most emscripten-compatible libretro cores. However, it is not so common, so you should check each one to see if they support it. The following cores have been tested with Archjs:
10 | 
11 |   - [Gambatte](https://github.com/libretro/gambatte-libretro)
12 |   - [VBA-Next](https://github.com/libretro/vba-next)
13 | 
14 | ## Multi-format cores
15 | 
16 | Some cores may support multiple kinds of games. In such event, you may use the file name option of the `loadArrayBuffer()` method to tell the emulator about the actual file name (since they often rely on the file extension to select the right emulator). However, each core also has a main extension (such as `.gb` for Gambatte, or `.gba` for VBA-Next) which will be used if you omit to specify the arraybuffer file name.
17 | 
18 | ## SDL frontend
19 | 
20 | In order to be easily debugged, Archjs ships with a small SDL frontend, mimicking Virtjs devices.
21 | 
22 | **Note** This frontend is only used when `make` is called without using emscripten, and is not present in the dist Javascript builds, which does not use the SDL at all (we instead except you to plug whatever device you want to usexs).
23 | 
24 | ## License
25 | 
26 | Archjs is supported and maintained by the [Start9](https://github.com/start9/) organization. The frontend is available under the [GPL v3 license](https://www.gnu.org/copyleft/gpl.html).
27 | 
28 | ## Contributing
29 | 
30 | If you notice a bug or want to suggest a feature, feel free to open an issue or pull request on the repository. However, keep in mind that the focus of Archjs is to remain simple (in order to be both easily compiled and heavily optimized by Emscripten).
31 | 
32 | We also hang out on the #start9-dev irc network on Freenode, so feel free to join us there.
33 | 


--------------------------------------------------------------------------------
/example/index.html:
--------------------------------------------------------------------------------
 1 | <!doctype html>
 2 | <html>
 3 | 
 4 |     <head>
 5 |         <script>var Module = { noInitialRun : true }</script>
 6 |         <style>html, body, #screen, #selector { display: block; margin: 0; padding: 0; width: 100%; height: 100%; }</style>
 7 |         <style>#selector, #overlay { position: absolute; left: 0; right: 0; top: 0; bottom: 0; }</style>
 8 |         <style>#overlay { pointer-events: none; background: #FFFFFF; }</style>
 9 |     </head>
10 | 
11 |     <body>
12 |         <canvas id="screen"></canvas>
13 |         <input id="selector" type="file" />
14 |         <div id="overlay">Click to select a file</div>
15 |     </body>
16 | 
17 |     <script>var ENGINE = location.hash.substring(1, location.hash.indexOf(':') !== -1 ? location.hash.indexOf(':') : undefined)</script>
18 |     <script>var GAMEPATH = location.hash.indexOf(':') !== -1 ? location.hash.substr(location.hash.indexOf(':') + 1) : undefined</script>
19 | 
20 |     <script>document.write('<script src="../dist/archjs-'+ENGINE+'.js"></'+'script>')</script>
21 | 
22 |     <script src="https://cdnjs.cloudflare.com/ajax/libs/fpsmeter/0.3.1/fpsmeter.min.js"></script>
23 | 
24 |     <script src="https://unpkg.com/virtjs@0.3.4/build/main.js"></script>
25 |     <script src="https://unpkg.com/audiojs@0.1.0/build/main.js"></script>
26 | 
27 |     <script src="./main.js"></script>
28 | 
29 | </html>
30 | 


--------------------------------------------------------------------------------
/example/main.js:
--------------------------------------------------------------------------------
 1 | var AudiojsAudio        = Audiojs.extra.AudiojsAudio;
 2 | var KeyboardInput       = Virtjs.devices.inputs.KeyboardInput;
 3 | var WebGLScreen         = Virtjs.devices.screens.WebGLScreen;
 4 | var AnimationFrameTimer = Virtjs.devices.timers.AnimationFrameTimer;
 5 | var fetchArrayBuffer    = Virtjs.utils.DataUtils.fetchArrayBuffer;
 6 | 
 7 | function listenShortcuts(engine) {
 8 | 
 9 |     var state = null;
10 | 
11 |     window.addEventListener('keydown', function (e) {
12 | 
13 |         if (e.keyCode !== 112 && e.keyCode !== 113)
14 |             return ;
15 | 
16 |         e.preventDefault();
17 | 
18 |         if (e.keyCode === 112) {
19 |             state = engine.getState();
20 |         } else if (e.keyCode === 113) {
21 |             state && engine.setState(state);
22 |         }
23 | 
24 |     });
25 | 
26 | }
27 | 
28 | function run(arrayBuffer, { fileName }) {
29 | 
30 |     var meter = new FPSMeter({ });
31 |     var Engine = Archjs.byName[ENGINE];
32 | 
33 |     var canvas = document.querySelector('#screen');
34 | 
35 |     var screen = new WebGLScreen({ canvas });
36 |     screen.setOutputSize(canvas.width, canvas.height);
37 | 
38 |     var input = new KeyboardInput({ codeMap: Engine.codeMap });
39 | 
40 |     var timer = new AnimationFrameTimer();
41 | 
42 |     timer.start(function () {
43 |         meter.tickStart();
44 |     }, function () {
45 |         meter.tick();
46 |     });
47 | 
48 |     var audio = new AudiojsAudio();
49 | 
50 |     var engine = new Engine({ devices: {
51 |         screen, timer, input, audio
52 |     } });
53 | 
54 |     engine.loadArrayBuffer(arrayBuffer, { fileName });
55 | 
56 |     listenShortcuts(engine);
57 | 
58 | }
59 | 
60 | function load(what, fileName) {
61 | 
62 |     return fetchArrayBuffer(what).then(function (arrayBuffer) {
63 | 
64 |         document.querySelector('#selector').style.display = 'none';
65 |         document.querySelector('#overlay').style.display = 'none';
66 | 
67 |         return run(arrayBuffer, fileName);
68 | 
69 |     });
70 | 
71 | }
72 | 
73 | if (GAMEPATH) {
74 | 
75 |     load(GAMEPATH, GAMEPATH.substr(GAMEPATH.lastIndexOf('/') + 1));
76 | 
77 | } else {
78 | 
79 |     var selector = document.querySelector('#selector');
80 | 
81 |     selector.addEventListener('change', function () {
82 |         load(selector.files[0], selector.files[0].name);
83 |     });
84 | 
85 | }
86 | 


--------------------------------------------------------------------------------
/example/vendors/CoreJs-0.9.6.min.js:
--------------------------------------------------------------------------------
 1 | /**
 2 |  * Core.js 0.9.6
 3 |  * https://github.com/zloirock/core-js
 4 |  * License: http://rock.mit-license.org
 5 |  * © 2015 Denis Pushkarev
 6 |  */
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10 | //# sourceMappingURL=shim.min.js.map


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/example/vendors/FpsMeter-0.3.1.min.js:
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 1 | /*! FPSMeter 0.3.1 - 9th May 2013 | https://github.com/Darsain/fpsmeter */
 2 | (function(m,j){function s(a,e){for(var g in e)try{a.style[g]=e[g]}catch(j){}return a}function H(a){return null==a?String(a):"object"===typeof a||"function"===typeof a?Object.prototype.toString.call(a).match(/\s([a-z]+)/i)[1].toLowerCase()||"object":typeof a}function R(a,e){if("array"!==H(e))return-1;if(e.indexOf)return e.indexOf(a);for(var g=0,j=e.length;g<j;g++)if(e[g]===a)return g;return-1}function I(){var a=arguments,e;for(e in a[1])if(a[1].hasOwnProperty(e))switch(H(a[1][e])){case "object":a[0][e]=
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 7 | v=g-n,v*=l*k,0===n||6===n?(n=l,k=t+v,l=t):1===n?(n=l-v,k=l,l=t):2===n?(n=t,k=l,l=t+v):3===n?(n=t,k=l-v):4===n?(n=t+v,k=t):(n=l,k=t,l-=v),g="#"+N(n)+N(k)+N(l));b[e]=g}}h.compiledHeatmaps=y}f.container=s(document.createElement("div"),h.container);f.count=f.container.appendChild(s(document.createElement("div"),h.count));f.legend=f.container.appendChild(s(document.createElement("div"),h.legend));f.graph=d.graph?f.container.appendChild(s(document.createElement("div"),h.graph)):0;w.length=0;for(var q in f)f[q]&&
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10 | C(x),C(P),x=P=0);return b};b.resume=function(){x||(b.isPaused=0,k());return b};b.set=function(a,c){d[a]=c;q="fps"===d.show;-1!==R(a,X)&&V();-1!==R(a,Y)&&s(f.container,d);return b};b.showDuration=function(){b.set("show","ms");return b};b.showFps=function(){b.set("show","fps");return b};b.toggle=function(){b.set("show",q?"ms":"fps");return b};b.hide=function(){b.pause();f.container.style.display="none";return b};b.show=function(){b.resume();f.container.style.display="block";return b};b.destroy=function(){b.pause();
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13 | textAlign:"left",zIndex:2},graph:{heatOn:null,heatmap:null,position:"relative",boxSizing:"padding-box",MozBoxSizing:"padding-box",height:"100%",zIndex:1},column:{width:4,spacing:1,heatOn:null,heatmap:null}};j.theme.dark=j.extend({},s,{heatmaps:[{saturation:0.8,lightness:0.8}],container:{background:"#222",color:"#fff",border:"1px solid #1a1a1a",textShadow:"1px 1px 0 #222"},count:{heatOn:"color"},column:{background:"#3f3f3f"}});j.theme.light=j.extend({},s,{heatmaps:[{saturation:0.5,lightness:0.5}],
14 | container:{color:"#666",background:"#fff",textShadow:"1px 1px 0 rgba(255,255,255,.5), -1px -1px 0 rgba(255,255,255,.5)",boxShadow:"0 0 0 1px rgba(0,0,0,.1)"},count:{heatOn:"color"},column:{background:"#eaeaea"}});j.theme.colorful=j.extend({},s,{heatmaps:[{saturation:0.5,lightness:0.6}],container:{heatOn:"backgroundColor",background:"#888",color:"#fff",textShadow:"1px 1px 0 rgba(0,0,0,.2)",boxShadow:"0 0 0 1px rgba(0,0,0,.1)"},column:{background:"#777",backgroundColor:"rgba(0,0,0,.2)"}});j.theme.transparent=
15 | j.extend({},s,{heatmaps:[{saturation:0.8,lightness:0.5}],container:{padding:0,color:"#fff",textShadow:"1px 1px 0 rgba(0,0,0,.5)"},count:{padding:"0 5px",height:"40px",lineHeight:"40px"},legend:{padding:"0 5px",height:"40px",lineHeight:"42px"},graph:{height:"40px"},column:{width:5,background:"#999",heatOn:"backgroundColor",opacity:0.5}})})(window,FPSMeter);
16 | 


--------------------------------------------------------------------------------
/includes/libretro.h:
--------------------------------------------------------------------------------
   1 | /* Copyright (C) 2010-2015 The RetroArch team
   2 |  *
   3 |  * ---------------------------------------------------------------------------------------
   4 |  * The following license statement only applies to this libretro API header (libretro.h).
   5 |  * ---------------------------------------------------------------------------------------
   6 |  *
   7 |  * Permission is hereby granted, free of charge,
   8 |  * to any person obtaining a copy of this software and associated documentation files (the "Software"),
   9 |  * to deal in the Software without restriction, including without limitation the rights to
  10 |  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
  11 |  * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
  12 |  *
  13 |  * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
  14 |  *
  15 |  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
  16 |  * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 |  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18 |  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  19 |  * 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 SOFTWARE.
  21 |  */
  22 | 
  23 | #ifndef LIBRETRO_H__
  24 | #define LIBRETRO_H__
  25 | 
  26 | #include <stdint.h>
  27 | #include <stddef.h>
  28 | #include <limits.h>
  29 | 
  30 | #ifdef __cplusplus
  31 | extern "C" {
  32 | #endif
  33 | 
  34 | #ifndef __cplusplus
  35 | #if defined(_MSC_VER) && !defined(SN_TARGET_PS3)
  36 | /* Hack applied for MSVC when compiling in C89 mode
  37 |  * as it isn't C99-compliant. */
  38 | #define bool unsigned char
  39 | #define true 1
  40 | #define false 0
  41 | #else
  42 | #include <stdbool.h>
  43 | #endif
  44 | #endif
  45 | 
  46 | /* Used for checking API/ABI mismatches that can break libretro 
  47 |  * implementations.
  48 |  * It is not incremented for compatible changes to the API.
  49 |  */
  50 | #define RETRO_API_VERSION         1
  51 | 
  52 | /*
  53 |  * Libretro's fundamental device abstractions.
  54 |  *
  55 |  * Libretro's input system consists of some standardized device types,
  56 |  * such as a joypad (with/without analog), mouse, keyboard, lightgun 
  57 |  * and a pointer.
  58 |  *
  59 |  * The functionality of these devices are fixed, and individual cores 
  60 |  * map their own concept of a controller to libretro's abstractions.
  61 |  * This makes it possible for frontends to map the abstract types to a 
  62 |  * real input device, and not having to worry about binding input 
  63 |  * correctly to arbitrary controller layouts.
  64 |  */
  65 | 
  66 | #define RETRO_DEVICE_TYPE_SHIFT         8
  67 | #define RETRO_DEVICE_MASK               ((1 << RETRO_DEVICE_TYPE_SHIFT) - 1)
  68 | #define RETRO_DEVICE_SUBCLASS(base, id) (((id + 1) << RETRO_DEVICE_TYPE_SHIFT) | base)
  69 | 
  70 | /* Input disabled. */
  71 | #define RETRO_DEVICE_NONE         0
  72 | 
  73 | /* The JOYPAD is called RetroPad. It is essentially a Super Nintendo 
  74 |  * controller, but with additional L2/R2/L3/R3 buttons, similar to a 
  75 |  * PS1 DualShock. */
  76 | #define RETRO_DEVICE_JOYPAD       1
  77 | 
  78 | /* The mouse is a simple mouse, similar to Super Nintendo's mouse.
  79 |  * X and Y coordinates are reported relatively to last poll (poll callback).
  80 |  * It is up to the libretro implementation to keep track of where the mouse 
  81 |  * pointer is supposed to be on the screen.
  82 |  * The frontend must make sure not to interfere with its own hardware 
  83 |  * mouse pointer.
  84 |  */
  85 | #define RETRO_DEVICE_MOUSE        2
  86 | 
  87 | /* KEYBOARD device lets one poll for raw key pressed.
  88 |  * It is poll based, so input callback will return with the current 
  89 |  * pressed state.
  90 |  * For event/text based keyboard input, see
  91 |  * RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK.
  92 |  */
  93 | #define RETRO_DEVICE_KEYBOARD     3
  94 | 
  95 | /* Lightgun X/Y coordinates are reported relatively to last poll,
  96 |  * similar to mouse. */
  97 | #define RETRO_DEVICE_LIGHTGUN     4
  98 | 
  99 | /* The ANALOG device is an extension to JOYPAD (RetroPad).
 100 |  * Similar to DualShock it adds two analog sticks.
 101 |  * This is treated as a separate device type as it returns values in the 
 102 |  * full analog range of [-0x8000, 0x7fff]. Positive X axis is right.
 103 |  * Positive Y axis is down.
 104 |  * Only use ANALOG type when polling for analog values of the axes.
 105 |  */
 106 | #define RETRO_DEVICE_ANALOG       5
 107 | 
 108 | /* Abstracts the concept of a pointing mechanism, e.g. touch.
 109 |  * This allows libretro to query in absolute coordinates where on the 
 110 |  * screen a mouse (or something similar) is being placed.
 111 |  * For a touch centric device, coordinates reported are the coordinates
 112 |  * of the press.
 113 |  *
 114 |  * Coordinates in X and Y are reported as:
 115 |  * [-0x7fff, 0x7fff]: -0x7fff corresponds to the far left/top of the screen,
 116 |  * and 0x7fff corresponds to the far right/bottom of the screen.
 117 |  * The "screen" is here defined as area that is passed to the frontend and 
 118 |  * later displayed on the monitor.
 119 |  *
 120 |  * The frontend is free to scale/resize this screen as it sees fit, however,
 121 |  * (X, Y) = (-0x7fff, -0x7fff) will correspond to the top-left pixel of the 
 122 |  * game image, etc.
 123 |  *
 124 |  * To check if the pointer coordinates are valid (e.g. a touch display 
 125 |  * actually being touched), PRESSED returns 1 or 0.
 126 |  *
 127 |  * If using a mouse on a desktop, PRESSED will usually correspond to the 
 128 |  * left mouse button, but this is a frontend decision.
 129 |  * PRESSED will only return 1 if the pointer is inside the game screen.
 130 |  *
 131 |  * For multi-touch, the index variable can be used to successively query 
 132 |  * more presses.
 133 |  * If index = 0 returns true for _PRESSED, coordinates can be extracted
 134 |  * with _X, _Y for index = 0. One can then query _PRESSED, _X, _Y with 
 135 |  * index = 1, and so on.
 136 |  * Eventually _PRESSED will return false for an index. No further presses 
 137 |  * are registered at this point. */
 138 | #define RETRO_DEVICE_POINTER      6
 139 | 
 140 | /* Buttons for the RetroPad (JOYPAD).
 141 |  * The placement of these is equivalent to placements on the 
 142 |  * Super Nintendo controller.
 143 |  * L2/R2/L3/R3 buttons correspond to the PS1 DualShock. */
 144 | #define RETRO_DEVICE_ID_JOYPAD_B        0
 145 | #define RETRO_DEVICE_ID_JOYPAD_Y        1
 146 | #define RETRO_DEVICE_ID_JOYPAD_SELECT   2
 147 | #define RETRO_DEVICE_ID_JOYPAD_START    3
 148 | #define RETRO_DEVICE_ID_JOYPAD_UP       4
 149 | #define RETRO_DEVICE_ID_JOYPAD_DOWN     5
 150 | #define RETRO_DEVICE_ID_JOYPAD_LEFT     6
 151 | #define RETRO_DEVICE_ID_JOYPAD_RIGHT    7
 152 | #define RETRO_DEVICE_ID_JOYPAD_A        8
 153 | #define RETRO_DEVICE_ID_JOYPAD_X        9
 154 | #define RETRO_DEVICE_ID_JOYPAD_L       10
 155 | #define RETRO_DEVICE_ID_JOYPAD_R       11
 156 | #define RETRO_DEVICE_ID_JOYPAD_L2      12
 157 | #define RETRO_DEVICE_ID_JOYPAD_R2      13
 158 | #define RETRO_DEVICE_ID_JOYPAD_L3      14
 159 | #define RETRO_DEVICE_ID_JOYPAD_R3      15
 160 | 
 161 | /* Index / Id values for ANALOG device. */
 162 | #define RETRO_DEVICE_INDEX_ANALOG_LEFT   0
 163 | #define RETRO_DEVICE_INDEX_ANALOG_RIGHT  1
 164 | #define RETRO_DEVICE_ID_ANALOG_X         0
 165 | #define RETRO_DEVICE_ID_ANALOG_Y         1
 166 | 
 167 | /* Id values for MOUSE. */
 168 | #define RETRO_DEVICE_ID_MOUSE_X          0
 169 | #define RETRO_DEVICE_ID_MOUSE_Y          1
 170 | #define RETRO_DEVICE_ID_MOUSE_LEFT       2
 171 | #define RETRO_DEVICE_ID_MOUSE_RIGHT      3
 172 | #define RETRO_DEVICE_ID_MOUSE_WHEELUP    4
 173 | #define RETRO_DEVICE_ID_MOUSE_WHEELDOWN  5
 174 | #define RETRO_DEVICE_ID_MOUSE_MIDDLE     6
 175 | 
 176 | /* Id values for LIGHTGUN types. */
 177 | #define RETRO_DEVICE_ID_LIGHTGUN_X        0
 178 | #define RETRO_DEVICE_ID_LIGHTGUN_Y        1
 179 | #define RETRO_DEVICE_ID_LIGHTGUN_TRIGGER  2
 180 | #define RETRO_DEVICE_ID_LIGHTGUN_CURSOR   3
 181 | #define RETRO_DEVICE_ID_LIGHTGUN_TURBO    4
 182 | #define RETRO_DEVICE_ID_LIGHTGUN_PAUSE    5
 183 | #define RETRO_DEVICE_ID_LIGHTGUN_START    6
 184 | 
 185 | /* Id values for POINTER. */
 186 | #define RETRO_DEVICE_ID_POINTER_X         0
 187 | #define RETRO_DEVICE_ID_POINTER_Y         1
 188 | #define RETRO_DEVICE_ID_POINTER_PRESSED   2
 189 | 
 190 | /* Returned from retro_get_region(). */
 191 | #define RETRO_REGION_NTSC  0
 192 | #define RETRO_REGION_PAL   1
 193 | 
 194 | /* Id values for LANGUAGE */
 195 | enum retro_language
 196 | {
 197 |    RETRO_LANGUAGE_ENGLISH             =  0,
 198 |    RETRO_LANGUAGE_JAPANESE            =  1,
 199 |    RETRO_LANGUAGE_FRENCH              =  2,
 200 |    RETRO_LANGUAGE_SPANISH             =  3,
 201 |    RETRO_LANGUAGE_GERMAN              =  4,
 202 |    RETRO_LANGUAGE_ITALIAN             =  5,
 203 |    RETRO_LANGUAGE_DUTCH               =  6,
 204 |    RETRO_LANGUAGE_PORTUGUESE          =  7,
 205 |    RETRO_LANGUAGE_RUSSIAN             =  8,
 206 |    RETRO_LANGUAGE_KOREAN              =  9,
 207 |    RETRO_LANGUAGE_CHINESE_TRADITIONAL = 10,
 208 |    RETRO_LANGUAGE_CHINESE_SIMPLIFIED  = 11,
 209 |    RETRO_LANGUAGE_LAST,
 210 | 
 211 |    /* Ensure sizeof(enum) == sizeof(int) */
 212 |    RETRO_LANGUAGE_DUMMY          = INT_MAX 
 213 | };
 214 | 
 215 | /* Passed to retro_get_memory_data/size().
 216 |  * If the memory type doesn't apply to the 
 217 |  * implementation NULL/0 can be returned.
 218 |  */
 219 | #define RETRO_MEMORY_MASK        0xff
 220 | 
 221 | /* Regular save RAM. This RAM is usually found on a game cartridge,
 222 |  * backed up by a battery.
 223 |  * If save game data is too complex for a single memory buffer,
 224 |  * the SAVE_DIRECTORY (preferably) or SYSTEM_DIRECTORY environment
 225 |  * callback can be used. */
 226 | #define RETRO_MEMORY_SAVE_RAM    0
 227 | 
 228 | /* Some games have a built-in clock to keep track of time.
 229 |  * This memory is usually just a couple of bytes to keep track of time.
 230 |  */
 231 | #define RETRO_MEMORY_RTC         1
 232 | 
 233 | /* System ram lets a frontend peek into a game systems main RAM. */
 234 | #define RETRO_MEMORY_SYSTEM_RAM  2
 235 | 
 236 | /* Video ram lets a frontend peek into a game systems video RAM (VRAM). */
 237 | #define RETRO_MEMORY_VIDEO_RAM   3
 238 | 
 239 | /* Keysyms used for ID in input state callback when polling RETRO_KEYBOARD. */
 240 | enum retro_key
 241 | {
 242 |    RETROK_UNKNOWN        = 0,
 243 |    RETROK_FIRST          = 0,
 244 |    RETROK_BACKSPACE      = 8,
 245 |    RETROK_TAB            = 9,
 246 |    RETROK_CLEAR          = 12,
 247 |    RETROK_RETURN         = 13,
 248 |    RETROK_PAUSE          = 19,
 249 |    RETROK_ESCAPE         = 27,
 250 |    RETROK_SPACE          = 32,
 251 |    RETROK_EXCLAIM        = 33,
 252 |    RETROK_QUOTEDBL       = 34,
 253 |    RETROK_HASH           = 35,
 254 |    RETROK_DOLLAR         = 36,
 255 |    RETROK_AMPERSAND      = 38,
 256 |    RETROK_QUOTE          = 39,
 257 |    RETROK_LEFTPAREN      = 40,
 258 |    RETROK_RIGHTPAREN     = 41,
 259 |    RETROK_ASTERISK       = 42,
 260 |    RETROK_PLUS           = 43,
 261 |    RETROK_COMMA          = 44,
 262 |    RETROK_MINUS          = 45,
 263 |    RETROK_PERIOD         = 46,
 264 |    RETROK_SLASH          = 47,
 265 |    RETROK_0              = 48,
 266 |    RETROK_1              = 49,
 267 |    RETROK_2              = 50,
 268 |    RETROK_3              = 51,
 269 |    RETROK_4              = 52,
 270 |    RETROK_5              = 53,
 271 |    RETROK_6              = 54,
 272 |    RETROK_7              = 55,
 273 |    RETROK_8              = 56,
 274 |    RETROK_9              = 57,
 275 |    RETROK_COLON          = 58,
 276 |    RETROK_SEMICOLON      = 59,
 277 |    RETROK_LESS           = 60,
 278 |    RETROK_EQUALS         = 61,
 279 |    RETROK_GREATER        = 62,
 280 |    RETROK_QUESTION       = 63,
 281 |    RETROK_AT             = 64,
 282 |    RETROK_LEFTBRACKET    = 91,
 283 |    RETROK_BACKSLASH      = 92,
 284 |    RETROK_RIGHTBRACKET   = 93,
 285 |    RETROK_CARET          = 94,
 286 |    RETROK_UNDERSCORE     = 95,
 287 |    RETROK_BACKQUOTE      = 96,
 288 |    RETROK_a              = 97,
 289 |    RETROK_b              = 98,
 290 |    RETROK_c              = 99,
 291 |    RETROK_d              = 100,
 292 |    RETROK_e              = 101,
 293 |    RETROK_f              = 102,
 294 |    RETROK_g              = 103,
 295 |    RETROK_h              = 104,
 296 |    RETROK_i              = 105,
 297 |    RETROK_j              = 106,
 298 |    RETROK_k              = 107,
 299 |    RETROK_l              = 108,
 300 |    RETROK_m              = 109,
 301 |    RETROK_n              = 110,
 302 |    RETROK_o              = 111,
 303 |    RETROK_p              = 112,
 304 |    RETROK_q              = 113,
 305 |    RETROK_r              = 114,
 306 |    RETROK_s              = 115,
 307 |    RETROK_t              = 116,
 308 |    RETROK_u              = 117,
 309 |    RETROK_v              = 118,
 310 |    RETROK_w              = 119,
 311 |    RETROK_x              = 120,
 312 |    RETROK_y              = 121,
 313 |    RETROK_z              = 122,
 314 |    RETROK_DELETE         = 127,
 315 | 
 316 |    RETROK_KP0            = 256,
 317 |    RETROK_KP1            = 257,
 318 |    RETROK_KP2            = 258,
 319 |    RETROK_KP3            = 259,
 320 |    RETROK_KP4            = 260,
 321 |    RETROK_KP5            = 261,
 322 |    RETROK_KP6            = 262,
 323 |    RETROK_KP7            = 263,
 324 |    RETROK_KP8            = 264,
 325 |    RETROK_KP9            = 265,
 326 |    RETROK_KP_PERIOD      = 266,
 327 |    RETROK_KP_DIVIDE      = 267,
 328 |    RETROK_KP_MULTIPLY    = 268,
 329 |    RETROK_KP_MINUS       = 269,
 330 |    RETROK_KP_PLUS        = 270,
 331 |    RETROK_KP_ENTER       = 271,
 332 |    RETROK_KP_EQUALS      = 272,
 333 | 
 334 |    RETROK_UP             = 273,
 335 |    RETROK_DOWN           = 274,
 336 |    RETROK_RIGHT          = 275,
 337 |    RETROK_LEFT           = 276,
 338 |    RETROK_INSERT         = 277,
 339 |    RETROK_HOME           = 278,
 340 |    RETROK_END            = 279,
 341 |    RETROK_PAGEUP         = 280,
 342 |    RETROK_PAGEDOWN       = 281,
 343 | 
 344 |    RETROK_F1             = 282,
 345 |    RETROK_F2             = 283,
 346 |    RETROK_F3             = 284,
 347 |    RETROK_F4             = 285,
 348 |    RETROK_F5             = 286,
 349 |    RETROK_F6             = 287,
 350 |    RETROK_F7             = 288,
 351 |    RETROK_F8             = 289,
 352 |    RETROK_F9             = 290,
 353 |    RETROK_F10            = 291,
 354 |    RETROK_F11            = 292,
 355 |    RETROK_F12            = 293,
 356 |    RETROK_F13            = 294,
 357 |    RETROK_F14            = 295,
 358 |    RETROK_F15            = 296,
 359 | 
 360 |    RETROK_NUMLOCK        = 300,
 361 |    RETROK_CAPSLOCK       = 301,
 362 |    RETROK_SCROLLOCK      = 302,
 363 |    RETROK_RSHIFT         = 303,
 364 |    RETROK_LSHIFT         = 304,
 365 |    RETROK_RCTRL          = 305,
 366 |    RETROK_LCTRL          = 306,
 367 |    RETROK_RALT           = 307,
 368 |    RETROK_LALT           = 308,
 369 |    RETROK_RMETA          = 309,
 370 |    RETROK_LMETA          = 310,
 371 |    RETROK_LSUPER         = 311,
 372 |    RETROK_RSUPER         = 312,
 373 |    RETROK_MODE           = 313,
 374 |    RETROK_COMPOSE        = 314,
 375 | 
 376 |    RETROK_HELP           = 315,
 377 |    RETROK_PRINT          = 316,
 378 |    RETROK_SYSREQ         = 317,
 379 |    RETROK_BREAK          = 318,
 380 |    RETROK_MENU           = 319,
 381 |    RETROK_POWER          = 320,
 382 |    RETROK_EURO           = 321,
 383 |    RETROK_UNDO           = 322,
 384 | 
 385 |    RETROK_LAST,
 386 | 
 387 |    RETROK_DUMMY          = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
 388 | };
 389 | 
 390 | enum retro_mod
 391 | {
 392 |    RETROKMOD_NONE       = 0x0000,
 393 | 
 394 |    RETROKMOD_SHIFT      = 0x01,
 395 |    RETROKMOD_CTRL       = 0x02,
 396 |    RETROKMOD_ALT        = 0x04,
 397 |    RETROKMOD_META       = 0x08,
 398 | 
 399 |    RETROKMOD_NUMLOCK    = 0x10,
 400 |    RETROKMOD_CAPSLOCK   = 0x20,
 401 |    RETROKMOD_SCROLLOCK  = 0x40,
 402 | 
 403 |    RETROKMOD_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
 404 | };
 405 | 
 406 | /* If set, this call is not part of the public libretro API yet. It can 
 407 |  * change or be removed at any time. */
 408 | #define RETRO_ENVIRONMENT_EXPERIMENTAL 0x10000
 409 | /* Environment callback to be used internally in frontend. */
 410 | #define RETRO_ENVIRONMENT_PRIVATE 0x20000
 411 | 
 412 | /* Environment commands. */
 413 | #define RETRO_ENVIRONMENT_SET_ROTATION  1  /* const unsigned * --
 414 |                                             * Sets screen rotation of graphics.
 415 |                                             * Is only implemented if rotation can be accelerated by hardware.
 416 |                                             * Valid values are 0, 1, 2, 3, which rotates screen by 0, 90, 180, 
 417 |                                             * 270 degrees counter-clockwise respectively.
 418 |                                             */
 419 | #define RETRO_ENVIRONMENT_GET_OVERSCAN  2  /* bool * --
 420 |                                             * Boolean value whether or not the implementation should use overscan, 
 421 |                                             * or crop away overscan.
 422 |                                             */
 423 | #define RETRO_ENVIRONMENT_GET_CAN_DUPE  3  /* bool * --
 424 |                                             * Boolean value whether or not frontend supports frame duping,
 425 |                                             * passing NULL to video frame callback.
 426 |                                             */
 427 | 
 428 |                                            /* Environ 4, 5 are no longer supported (GET_VARIABLE / SET_VARIABLES), 
 429 |                                             * and reserved to avoid possible ABI clash.
 430 |                                             */
 431 | 
 432 | #define RETRO_ENVIRONMENT_SET_MESSAGE   6  /* const struct retro_message * --
 433 |                                             * Sets a message to be displayed in implementation-specific manner 
 434 |                                             * for a certain amount of 'frames'.
 435 |                                             * Should not be used for trivial messages, which should simply be 
 436 |                                             * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a 
 437 |                                             * fallback, stderr).
 438 |                                             */
 439 | #define RETRO_ENVIRONMENT_SHUTDOWN      7  /* N/A (NULL) --
 440 |                                             * Requests the frontend to shutdown.
 441 |                                             * Should only be used if game has a specific
 442 |                                             * way to shutdown the game from a menu item or similar.
 443 |                                             */
 444 | #define RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL 8
 445 |                                            /* const unsigned * --
 446 |                                             * Gives a hint to the frontend how demanding this implementation
 447 |                                             * is on a system. E.g. reporting a level of 2 means
 448 |                                             * this implementation should run decently on all frontends
 449 |                                             * of level 2 and up.
 450 |                                             *
 451 |                                             * It can be used by the frontend to potentially warn
 452 |                                             * about too demanding implementations.
 453 |                                             *
 454 |                                             * The levels are "floating".
 455 |                                             *
 456 |                                             * This function can be called on a per-game basis,
 457 |                                             * as certain games an implementation can play might be
 458 |                                             * particularly demanding.
 459 |                                             * If called, it should be called in retro_load_game().
 460 |                                             */
 461 | #define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9
 462 |                                            /* const char ** --
 463 |                                             * Returns the "system" directory of the frontend.
 464 |                                             * This directory can be used to store system specific 
 465 |                                             * content such as BIOSes, configuration data, etc.
 466 |                                             * The returned value can be NULL.
 467 |                                             * If so, no such directory is defined,
 468 |                                             * and it's up to the implementation to find a suitable directory.
 469 |                                             *
 470 |                                             * NOTE: Some cores used this folder also for "save" data such as 
 471 |                                             * memory cards, etc, for lack of a better place to put it.
 472 |                                             * This is now discouraged, and if possible, cores should try to 
 473 |                                             * use the new GET_SAVE_DIRECTORY.
 474 |                                             */
 475 | #define RETRO_ENVIRONMENT_SET_PIXEL_FORMAT 10
 476 |                                            /* const enum retro_pixel_format * --
 477 |                                             * Sets the internal pixel format used by the implementation.
 478 |                                             * The default pixel format is RETRO_PIXEL_FORMAT_0RGB1555.
 479 |                                             * This pixel format however, is deprecated (see enum retro_pixel_format).
 480 |                                             * If the call returns false, the frontend does not support this pixel 
 481 |                                             * format.
 482 |                                             *
 483 |                                             * This function should be called inside retro_load_game() or 
 484 |                                             * retro_get_system_av_info().
 485 |                                             */
 486 | #define RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS 11
 487 |                                            /* const struct retro_input_descriptor * --
 488 |                                             * Sets an array of retro_input_descriptors.
 489 |                                             * It is up to the frontend to present this in a usable way.
 490 |                                             * The array is terminated by retro_input_descriptor::description 
 491 |                                             * being set to NULL.
 492 |                                             * This function can be called at any time, but it is recommended 
 493 |                                             * to call it as early as possible.
 494 |                                             */
 495 | #define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12
 496 |                                            /* const struct retro_keyboard_callback * --
 497 |                                             * Sets a callback function used to notify core about keyboard events.
 498 |                                             */
 499 | #define RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE 13
 500 |                                            /* const struct retro_disk_control_callback * --
 501 |                                             * Sets an interface which frontend can use to eject and insert 
 502 |                                             * disk images.
 503 |                                             * This is used for games which consist of multiple images and 
 504 |                                             * must be manually swapped out by the user (e.g. PSX).
 505 |                                             */
 506 | #define RETRO_ENVIRONMENT_SET_HW_RENDER 14
 507 |                                            /* struct retro_hw_render_callback * --
 508 |                                             * Sets an interface to let a libretro core render with 
 509 |                                             * hardware acceleration.
 510 |                                             * Should be called in retro_load_game().
 511 |                                             * If successful, libretro cores will be able to render to a 
 512 |                                             * frontend-provided framebuffer.
 513 |                                             * The size of this framebuffer will be at least as large as 
 514 |                                             * max_width/max_height provided in get_av_info().
 515 |                                             * If HW rendering is used, pass only RETRO_HW_FRAME_BUFFER_VALID or 
 516 |                                             * NULL to retro_video_refresh_t.
 517 |                                             */
 518 | #define RETRO_ENVIRONMENT_GET_VARIABLE 15
 519 |                                            /* struct retro_variable * --
 520 |                                             * Interface to acquire user-defined information from environment
 521 |                                             * that cannot feasibly be supported in a multi-system way.
 522 |                                             * 'key' should be set to a key which has already been set by 
 523 |                                             * SET_VARIABLES.
 524 |                                             * 'data' will be set to a value or NULL.
 525 |                                             */
 526 | #define RETRO_ENVIRONMENT_SET_VARIABLES 16
 527 |                                            /* const struct retro_variable * --
 528 |                                             * Allows an implementation to signal the environment
 529 |                                             * which variables it might want to check for later using 
 530 |                                             * GET_VARIABLE.
 531 |                                             * This allows the frontend to present these variables to 
 532 |                                             * a user dynamically.
 533 |                                             * This should be called as early as possible (ideally in 
 534 |                                             * retro_set_environment).
 535 |                                             *
 536 |                                             * 'data' points to an array of retro_variable structs 
 537 |                                             * terminated by a { NULL, NULL } element.
 538 |                                             * retro_variable::key should be namespaced to not collide 
 539 |                                             * with other implementations' keys. E.g. A core called 
 540 |                                             * 'foo' should use keys named as 'foo_option'.
 541 |                                             * retro_variable::value should contain a human readable 
 542 |                                             * description of the key as well as a '|' delimited list 
 543 |                                             * of expected values.
 544 |                                             *
 545 |                                             * The number of possible options should be very limited, 
 546 |                                             * i.e. it should be feasible to cycle through options 
 547 |                                             * without a keyboard.
 548 |                                             *
 549 |                                             * First entry should be treated as a default.
 550 |                                             *
 551 |                                             * Example entry:
 552 |                                             * { "foo_option", "Speed hack coprocessor X; false|true" }
 553 |                                             *
 554 |                                             * Text before first ';' is description. This ';' must be 
 555 |                                             * followed by a space, and followed by a list of possible 
 556 |                                             * values split up with '|'.
 557 |                                             *
 558 |                                             * Only strings are operated on. The possible values will 
 559 |                                             * generally be displayed and stored as-is by the frontend.
 560 |                                             */
 561 | #define RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE 17
 562 |                                            /* bool * --
 563 |                                             * Result is set to true if some variables are updated by
 564 |                                             * frontend since last call to RETRO_ENVIRONMENT_GET_VARIABLE.
 565 |                                             * Variables should be queried with GET_VARIABLE.
 566 |                                             */
 567 | #define RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME 18
 568 |                                            /* const bool * --
 569 |                                             * If true, the libretro implementation supports calls to 
 570 |                                             * retro_load_game() with NULL as argument.
 571 |                                             * Used by cores which can run without particular game data.
 572 |                                             * This should be called within retro_set_environment() only.
 573 |                                             */
 574 | #define RETRO_ENVIRONMENT_GET_LIBRETRO_PATH 19
 575 |                                            /* const char ** --
 576 |                                             * Retrieves the absolute path from where this libretro 
 577 |                                             * implementation was loaded.
 578 |                                             * NULL is returned if the libretro was loaded statically 
 579 |                                             * (i.e. linked statically to frontend), or if the path cannot be 
 580 |                                             * determined.
 581 |                                             * Mostly useful in cooperation with SET_SUPPORT_NO_GAME as assets can 
 582 |                                             * be loaded without ugly hacks.
 583 |                                             */
 584 |                                            
 585 |                                            /* Environment 20 was an obsolete version of SET_AUDIO_CALLBACK. 
 586 |                                             * It was not used by any known core at the time,
 587 |                                             * and was removed from the API. */
 588 | #define RETRO_ENVIRONMENT_SET_AUDIO_CALLBACK 22
 589 |                                            /* const struct retro_audio_callback * --
 590 |                                             * Sets an interface which is used to notify a libretro core about audio 
 591 |                                             * being available for writing.
 592 |                                             * The callback can be called from any thread, so a core using this must 
 593 |                                             * have a thread safe audio implementation.
 594 |                                             * It is intended for games where audio and video are completely 
 595 |                                             * asynchronous and audio can be generated on the fly.
 596 |                                             * This interface is not recommended for use with emulators which have 
 597 |                                             * highly synchronous audio.
 598 |                                             *
 599 |                                             * The callback only notifies about writability; the libretro core still 
 600 |                                             * has to call the normal audio callbacks
 601 |                                             * to write audio. The audio callbacks must be called from within the 
 602 |                                             * notification callback.
 603 |                                             * The amount of audio data to write is up to the implementation.
 604 |                                             * Generally, the audio callback will be called continously in a loop.
 605 |                                             *
 606 |                                             * Due to thread safety guarantees and lack of sync between audio and 
 607 |                                             * video, a frontend  can selectively disallow this interface based on 
 608 |                                             * internal configuration. A core using this interface must also 
 609 |                                             * implement the "normal" audio interface.
 610 |                                             *
 611 |                                             * A libretro core using SET_AUDIO_CALLBACK should also make use of 
 612 |                                             * SET_FRAME_TIME_CALLBACK.
 613 |                                             */
 614 | #define RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK 21
 615 |                                            /* const struct retro_frame_time_callback * --
 616 |                                             * Lets the core know how much time has passed since last 
 617 |                                             * invocation of retro_run().
 618 |                                             * The frontend can tamper with the timing to fake fast-forward, 
 619 |                                             * slow-motion, frame stepping, etc.
 620 |                                             * In this case the delta time will use the reference value 
 621 |                                             * in frame_time_callback..
 622 |                                             */
 623 | #define RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE 23
 624 |                                            /* struct retro_rumble_interface * --
 625 |                                             * Gets an interface which is used by a libretro core to set 
 626 |                                             * state of rumble motors in controllers.
 627 |                                             * A strong and weak motor is supported, and they can be 
 628 |                                             * controlled indepedently.
 629 |                                             */
 630 | #define RETRO_ENVIRONMENT_GET_INPUT_DEVICE_CAPABILITIES 24
 631 |                                            /* uint64_t * --
 632 |                                             * Gets a bitmask telling which device type are expected to be 
 633 |                                             * handled properly in a call to retro_input_state_t.
 634 |                                             * Devices which are not handled or recognized always return 
 635 |                                             * 0 in retro_input_state_t.
 636 |                                             * Example bitmask: caps = (1 << RETRO_DEVICE_JOYPAD) | (1 << RETRO_DEVICE_ANALOG).
 637 |                                             * Should only be called in retro_run().
 638 |                                             */
 639 | #define RETRO_ENVIRONMENT_GET_SENSOR_INTERFACE (25 | RETRO_ENVIRONMENT_EXPERIMENTAL)
 640 |                                            /* struct retro_sensor_interface * --
 641 |                                             * Gets access to the sensor interface.
 642 |                                             * The purpose of this interface is to allow
 643 |                                             * setting state related to sensors such as polling rate, 
 644 |                                             * enabling/disable it entirely, etc.
 645 |                                             * Reading sensor state is done via the normal 
 646 |                                             * input_state_callback API.
 647 |                                             */
 648 | #define RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE (26 | RETRO_ENVIRONMENT_EXPERIMENTAL)
 649 |                                            /* struct retro_camera_callback * --
 650 |                                             * Gets an interface to a video camera driver.
 651 |                                             * A libretro core can use this interface to get access to a 
 652 |                                             * video camera.
 653 |                                             * New video frames are delivered in a callback in same 
 654 |                                             * thread as retro_run().
 655 |                                             *
 656 |                                             * GET_CAMERA_INTERFACE should be called in retro_load_game().
 657 |                                             *
 658 |                                             * Depending on the camera implementation used, camera frames 
 659 |                                             * will be delivered as a raw framebuffer,
 660 |                                             * or as an OpenGL texture directly.
 661 |                                             *
 662 |                                             * The core has to tell the frontend here which types of 
 663 |                                             * buffers can be handled properly.
 664 |                                             * An OpenGL texture can only be handled when using a 
 665 |                                             * libretro GL core (SET_HW_RENDER).
 666 |                                             * It is recommended to use a libretro GL core when 
 667 |                                             * using camera interface.
 668 |                                             *
 669 |                                             * The camera is not started automatically. The retrieved start/stop 
 670 |                                             * functions must be used to explicitly
 671 |                                             * start and stop the camera driver.
 672 |                                             */
 673 | #define RETRO_ENVIRONMENT_GET_LOG_INTERFACE 27
 674 |                                            /* struct retro_log_callback * --
 675 |                                             * Gets an interface for logging. This is useful for 
 676 |                                             * logging in a cross-platform way
 677 |                                             * as certain platforms cannot use use stderr for logging. 
 678 |                                             * It also allows the frontend to
 679 |                                             * show logging information in a more suitable way.
 680 |                                             * If this interface is not used, libretro cores should 
 681 |                                             * log to stderr as desired.
 682 |                                             */
 683 | #define RETRO_ENVIRONMENT_GET_PERF_INTERFACE 28
 684 |                                            /* struct retro_perf_callback * --
 685 |                                             * Gets an interface for performance counters. This is useful 
 686 |                                             * for performance logging in a cross-platform way and for detecting 
 687 |                                             * architecture-specific features, such as SIMD support.
 688 |                                             */
 689 | #define RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE 29
 690 |                                            /* struct retro_location_callback * --
 691 |                                             * Gets access to the location interface.
 692 |                                             * The purpose of this interface is to be able to retrieve 
 693 |                                             * location-based information from the host device,
 694 |                                             * such as current latitude / longitude.
 695 |                                             */
 696 | #define RETRO_ENVIRONMENT_GET_CONTENT_DIRECTORY 30
 697 |                                            /* const char ** --
 698 |                                             * Returns the "content" directory of the frontend.
 699 |                                             * This directory can be used to store specific assets that the 
 700 |                                             * core relies upon, such as art assets,
 701 |                                             * input data, etc etc.
 702 |                                             * The returned value can be NULL.
 703 |                                             * If so, no such directory is defined,
 704 |                                             * and it's up to the implementation to find a suitable directory.
 705 |                                             */
 706 | #define RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY 31
 707 |                                            /* const char ** --
 708 |                                             * Returns the "save" directory of the frontend.
 709 |                                             * This directory can be used to store SRAM, memory cards, 
 710 |                                             * high scores, etc, if the libretro core
 711 |                                             * cannot use the regular memory interface (retro_get_memory_data()).
 712 |                                             *
 713 |                                             * NOTE: libretro cores used to check GET_SYSTEM_DIRECTORY for 
 714 |                                             * similar things before.
 715 |                                             * They should still check GET_SYSTEM_DIRECTORY if they want to 
 716 |                                             * be backwards compatible.
 717 |                                             * The path here can be NULL. It should only be non-NULL if the 
 718 |                                             * frontend user has set a specific save path.
 719 |                                             */
 720 | #define RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO 32
 721 |                                            /* const struct retro_system_av_info * --
 722 |                                             * Sets a new av_info structure. This can only be called from 
 723 |                                             * within retro_run().
 724 |                                             * This should *only* be used if the core is completely altering the 
 725 |                                             * internal resolutions, aspect ratios, timings, sampling rate, etc.
 726 |                                             * Calling this can require a full reinitialization of video/audio 
 727 |                                             * drivers in the frontend,
 728 |                                             *
 729 |                                             * so it is important to call it very sparingly, and usually only with 
 730 |                                             * the users explicit consent.
 731 |                                             * An eventual driver reinitialize will happen so that video and 
 732 |                                             * audio callbacks
 733 |                                             * happening after this call within the same retro_run() call will 
 734 |                                             * target the newly initialized driver.
 735 |                                             *
 736 |                                             * This callback makes it possible to support configurable resolutions 
 737 |                                             * in games, which can be useful to
 738 |                                             * avoid setting the "worst case" in max_width/max_height.
 739 |                                             *
 740 |                                             * ***HIGHLY RECOMMENDED*** Do not call this callback every time 
 741 |                                             * resolution changes in an emulator core if it's
 742 |                                             * expected to be a temporary change, for the reasons of possible 
 743 |                                             * driver reinitialization.
 744 |                                             * This call is not a free pass for not trying to provide 
 745 |                                             * correct values in retro_get_system_av_info(). If you need to change 
 746 |                                             * things like aspect ratio or nominal width/height, 
 747 |                                             * use RETRO_ENVIRONMENT_SET_GEOMETRY, which is a softer variant 
 748 |                                             * of SET_SYSTEM_AV_INFO.
 749 |                                             *
 750 |                                             * If this returns false, the frontend does not acknowledge a 
 751 |                                             * changed av_info struct.
 752 |                                             */
 753 | #define RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK 33
 754 |                                            /* const struct retro_get_proc_address_interface * --
 755 |                                             * Allows a libretro core to announce support for the 
 756 |                                             * get_proc_address() interface.
 757 |                                             * This interface allows for a standard way to extend libretro where 
 758 |                                             * use of environment calls are too indirect,
 759 |                                             * e.g. for cases where the frontend wants to call directly into the core.
 760 |                                             *
 761 |                                             * If a core wants to expose this interface, SET_PROC_ADDRESS_CALLBACK 
 762 |                                             * **MUST** be called from within retro_set_environment().
 763 |                                             */
 764 | #define RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO 34
 765 |                                            /* const struct retro_subsystem_info * --
 766 |                                             * This environment call introduces the concept of libretro "subsystems".
 767 |                                             * A subsystem is a variant of a libretro core which supports 
 768 |                                             * different kinds of games.
 769 |                                             * The purpose of this is to support e.g. emulators which might 
 770 |                                             * have special needs, e.g. Super Nintendo's Super GameBoy, Sufami Turbo.
 771 |                                             * It can also be used to pick among subsystems in an explicit way 
 772 |                                             * if the libretro implementation is a multi-system emulator itself.
 773 |                                             *
 774 |                                             * Loading a game via a subsystem is done with retro_load_game_special(),
 775 |                                             * and this environment call allows a libretro core to expose which 
 776 |                                             * subsystems are supported for use with retro_load_game_special().
 777 |                                             * A core passes an array of retro_game_special_info which is terminated 
 778 |                                             * with a zeroed out retro_game_special_info struct.
 779 |                                             *
 780 |                                             * If a core wants to use this functionality, SET_SUBSYSTEM_INFO
 781 |                                             * **MUST** be called from within retro_set_environment().
 782 |                                             */
 783 | #define RETRO_ENVIRONMENT_SET_CONTROLLER_INFO 35
 784 |                                            /* const struct retro_controller_info * --
 785 |                                             * This environment call lets a libretro core tell the frontend 
 786 |                                             * which controller types are recognized in calls to 
 787 |                                             * retro_set_controller_port_device().
 788 |                                             *
 789 |                                             * Some emulators such as Super Nintendo
 790 |                                             * support multiple lightgun types which must be specifically 
 791 |                                             * selected from.
 792 |                                             * It is therefore sometimes necessary for a frontend to be able 
 793 |                                             * to tell the core about a special kind of input device which is 
 794 |                                             * not covered by the libretro input API.
 795 |                                             *
 796 |                                             * In order for a frontend to understand the workings of an input device,
 797 |                                             * it must be a specialized type
 798 |                                             * of the generic device types already defined in the libretro API.
 799 |                                             *
 800 |                                             * Which devices are supported can vary per input port.
 801 |                                             * The core must pass an array of const struct retro_controller_info which 
 802 |                                             * is terminated with a blanked out struct. Each element of the struct 
 803 |                                             * corresponds to an ascending port index to 
 804 |                                             * retro_set_controller_port_device().
 805 |                                             * Even if special device types are set in the libretro core, 
 806 |                                             * libretro should only poll input based on the base input device types.
 807 |                                             */
 808 | #define RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL)
 809 |                                            /* const struct retro_memory_map * --
 810 |                                             * This environment call lets a libretro core tell the frontend 
 811 |                                             * about the memory maps this core emulates.
 812 |                                             * This can be used to implement, for example, cheats in a core-agnostic way.
 813 |                                             *
 814 |                                             * Should only be used by emulators; it doesn't make much sense for 
 815 |                                             * anything else.
 816 |                                             * It is recommended to expose all relevant pointers through 
 817 |                                             * retro_get_memory_* as well.
 818 |                                             *
 819 |                                             * Can be called from retro_init and retro_load_game.
 820 |                                             */
 821 | #define RETRO_ENVIRONMENT_SET_GEOMETRY 37
 822 |                                            /* const struct retro_game_geometry * --
 823 |                                             * This environment call is similar to SET_SYSTEM_AV_INFO for changing 
 824 |                                             * video parameters, but provides a guarantee that drivers will not be 
 825 |                                             * reinitialized.
 826 |                                             * This can only be called from within retro_run().
 827 |                                             *
 828 |                                             * The purpose of this call is to allow a core to alter nominal 
 829 |                                             * width/heights as well as aspect ratios on-the-fly, which can be 
 830 |                                             * useful for some emulators to change in run-time.
 831 |                                             *
 832 |                                             * max_width/max_height arguments are ignored and cannot be changed
 833 |                                             * with this call as this could potentially require a reinitialization or a 
 834 |                                             * non-constant time operation.
 835 |                                             * If max_width/max_height are to be changed, SET_SYSTEM_AV_INFO is required.
 836 |                                             *
 837 |                                             * A frontend must guarantee that this environment call completes in 
 838 |                                             * constant time.
 839 |                                             */
 840 | #define RETRO_ENVIRONMENT_GET_USERNAME 38 
 841 |                                            /* const char **
 842 |                                             * Returns the specified username of the frontend, if specified by the user.
 843 |                                             * This username can be used as a nickname for a core that has online facilities 
 844 |                                             * or any other mode where personalization of the user is desirable.
 845 |                                             * The returned value can be NULL.
 846 |                                             * If this environ callback is used by a core that requires a valid username, 
 847 |                                             * a default username should be specified by the core.
 848 |                                             */
 849 | #define RETRO_ENVIRONMENT_GET_LANGUAGE 39
 850 |                                            /* unsigned * --
 851 |                                             * Returns the specified language of the frontend, if specified by the user.
 852 |                                             * It can be used by the core for localization purposes.
 853 |                                             */
 854 | 
 855 | #define RETRO_ENVIRONMENT_MAKE_CURRENT_CONTEXT (40 | RETRO_ENVIRONMENT_EXPERIMENTAL)
 856 |                                            /* struct retro_hw_make_current_context_callback *
 857 |                                             */
 858 | 
 859 | #define RETRO_MEMDESC_CONST     (1 << 0)   /* The frontend will never change this memory area once retro_load_game has returned. */
 860 | #define RETRO_MEMDESC_BIGENDIAN (1 << 1)   /* The memory area contains big endian data. Default is little endian. */
 861 | #define RETRO_MEMDESC_ALIGN_2   (1 << 16)  /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */
 862 | #define RETRO_MEMDESC_ALIGN_4   (2 << 16)
 863 | #define RETRO_MEMDESC_ALIGN_8   (3 << 16)
 864 | #define RETRO_MEMDESC_MINSIZE_2 (1 << 24)  /* All memory in this region is accessed at least 2 bytes at the time. */
 865 | #define RETRO_MEMDESC_MINSIZE_4 (2 << 24)
 866 | #define RETRO_MEMDESC_MINSIZE_8 (3 << 24)
 867 | struct retro_memory_descriptor
 868 | {
 869 |    uint64_t flags;
 870 | 
 871 |    /* Pointer to the start of the relevant ROM or RAM chip.
 872 |     * It's strongly recommended to use 'offset' if possible, rather than 
 873 |     * doing math on the pointer.
 874 |     *
 875 |     * If the same byte is mapped my multiple descriptors, their descriptors 
 876 |     * must have the same pointer.
 877 |     * If 'start' does not point to the first byte in the pointer, put the 
 878 |     * difference in 'offset' instead.
 879 |     *
 880 |     * May be NULL if there's nothing usable here (e.g. hardware registers and 
 881 |     * open bus). No flags should be set if the pointer is NULL.
 882 |     * It's recommended to minimize the number of descriptors if possible,
 883 |     * but not mandatory. */
 884 |    void *ptr;
 885 |    size_t offset;
 886 | 
 887 |    /* This is the location in the emulated address space 
 888 |     * where the mapping starts. */
 889 |    size_t start;
 890 | 
 891 |    /* Which bits must be same as in 'start' for this mapping to apply.
 892 |     * The first memory descriptor to claim a certain byte is the one 
 893 |     * that applies.
 894 |     * A bit which is set in 'start' must also be set in this.
 895 |     * Can be zero, in which case each byte is assumed mapped exactly once. 
 896 |     * In this case, 'len' must be a power of two. */
 897 |    size_t select;
 898 | 
 899 |    /* If this is nonzero, the set bits are assumed not connected to the 
 900 |     * memory chip's address pins. */
 901 |    size_t disconnect;
 902 | 
 903 |    /* This one tells the size of the current memory area.
 904 |     * If, after start+disconnect are applied, the address is higher than 
 905 |     * this, the highest bit of the address is cleared.
 906 |     *
 907 |     * If the address is still too high, the next highest bit is cleared.
 908 |     * Can be zero, in which case it's assumed to be infinite (as limited 
 909 |     * by 'select' and 'disconnect'). */
 910 |    size_t len;
 911 | 
 912 |    /* To go from emulated address to physical address, the following 
 913 |     * order applies:
 914 |     * Subtract 'start', pick off 'disconnect', apply 'len', add 'offset'.
 915 |     *
 916 |     * The address space name must consist of only a-zA-Z0-9_-, 
 917 |     * should be as short as feasible (maximum length is 8 plus the NUL),
 918 |     * and may not be any other address space plus one or more 0-9A-F 
 919 |     * at the end.
 920 |     * However, multiple memory descriptors for the same address space is 
 921 |     * allowed, and the address space name can be empty. NULL is treated 
 922 |     * as empty.
 923 |     *
 924 |     * Address space names are case sensitive, but avoid lowercase if possible.
 925 |     * The same pointer may exist in multiple address spaces.
 926 |     *
 927 |     * Examples:
 928 |     * blank+blank - valid (multiple things may be mapped in the same namespace)
 929 |     * 'Sp'+'Sp' - valid (multiple things may be mapped in the same namespace)
 930 |     * 'A'+'B' - valid (neither is a prefix of each other)
 931 |     * 'S'+blank - valid ('S' is not in 0-9A-F)
 932 |     * 'a'+blank - valid ('a' is not in 0-9A-F)
 933 |     * 'a'+'A' - valid (neither is a prefix of each other)
 934 |     * 'AR'+blank - valid ('R' is not in 0-9A-F)
 935 |     * 'ARB'+blank - valid (the B can't be part of the address either, because 
 936 |     * there is no namespace 'AR')
 937 |     * blank+'B' - not valid, because it's ambigous which address space B1234 
 938 |     * would refer to.
 939 |     * The length can't be used for that purpose; the frontend may want 
 940 |     * to append arbitrary data to an address, without a separator. */
 941 |    const char *addrspace;
 942 | };
 943 | 
 944 | /* The frontend may use the largest value of 'start'+'select' in a 
 945 |  * certain namespace to infer the size of the address space.
 946 |  *
 947 |  * If the address space is larger than that, a mapping with .ptr=NULL 
 948 |  * should be at the end of the array, with .select set to all ones for 
 949 |  * as long as the address space is big.
 950 |  *
 951 |  * Sample descriptors (minus .ptr, and RETRO_MEMFLAG_ on the flags):
 952 |  * SNES WRAM:
 953 |  * .start=0x7E0000, .len=0x20000
 954 |  * (Note that this must be mapped before the ROM in most cases; some of the 
 955 |  * ROM mappers 
 956 |  * try to claim $7E0000, or at least $7E8000.)
 957 |  * SNES SPC700 RAM:
 958 |  * .addrspace="S", .len=0x10000
 959 |  * SNES WRAM mirrors:
 960 |  * .flags=MIRROR, .start=0x000000, .select=0xC0E000, .len=0x2000
 961 |  * .flags=MIRROR, .start=0x800000, .select=0xC0E000, .len=0x2000
 962 |  * SNES WRAM mirrors, alternate equivalent descriptor:
 963 |  * .flags=MIRROR, .select=0x40E000, .disconnect=~0x1FFF
 964 |  * (Various similar constructions can be created by combining parts of 
 965 |  * the above two.)
 966 |  * SNES LoROM (512KB, mirrored a couple of times):
 967 |  * .flags=CONST, .start=0x008000, .select=0x408000, .disconnect=0x8000, .len=512*1024
 968 |  * .flags=CONST, .start=0x400000, .select=0x400000, .disconnect=0x8000, .len=512*1024
 969 |  * SNES HiROM (4MB):
 970 |  * .flags=CONST,                 .start=0x400000, .select=0x400000, .len=4*1024*1024
 971 |  * .flags=CONST, .offset=0x8000, .start=0x008000, .select=0x408000, .len=4*1024*1024
 972 |  * SNES ExHiROM (8MB):
 973 |  * .flags=CONST, .offset=0,                  .start=0xC00000, .select=0xC00000, .len=4*1024*1024
 974 |  * .flags=CONST, .offset=4*1024*1024,        .start=0x400000, .select=0xC00000, .len=4*1024*1024
 975 |  * .flags=CONST, .offset=0x8000,             .start=0x808000, .select=0xC08000, .len=4*1024*1024
 976 |  * .flags=CONST, .offset=4*1024*1024+0x8000, .start=0x008000, .select=0xC08000, .len=4*1024*1024
 977 |  * Clarify the size of the address space:
 978 |  * .ptr=NULL, .select=0xFFFFFF
 979 |  * .len can be implied by .select in many of them, but was included for clarity.
 980 |  */
 981 | 
 982 | struct retro_memory_map
 983 | {
 984 |    const struct retro_memory_descriptor *descriptors;
 985 |    unsigned num_descriptors;
 986 | };
 987 | 
 988 | struct retro_controller_description
 989 | {
 990 |    /* Human-readable description of the controller. Even if using a generic 
 991 |     * input device type, this can be set to the particular device type the 
 992 |     * core uses. */
 993 |    const char *desc;
 994 | 
 995 |    /* Device type passed to retro_set_controller_port_device(). If the device 
 996 |     * type is a sub-class of a generic input device type, use the 
 997 |     * RETRO_DEVICE_SUBCLASS macro to create an ID.
 998 |     *
 999 |     * E.g. RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1). */
1000 |    unsigned id;
1001 | };
1002 | 
1003 | struct retro_controller_info
1004 | {
1005 |    const struct retro_controller_description *types;
1006 |    unsigned num_types;
1007 | };
1008 | 
1009 | struct retro_subsystem_memory_info
1010 | {
1011 |    /* The extension associated with a memory type, e.g. "psram". */
1012 |    const char *extension;
1013 | 
1014 |    /* The memory type for retro_get_memory(). This should be at 
1015 |     * least 0x100 to avoid conflict with standardized 
1016 |     * libretro memory types. */
1017 |    unsigned type;
1018 | };
1019 | 
1020 | struct retro_subsystem_rom_info
1021 | {
1022 |    /* Describes what the content is (SGB BIOS, GB ROM, etc). */
1023 |    const char *desc;
1024 | 
1025 |    /* Same definition as retro_get_system_info(). */
1026 |    const char *valid_extensions;
1027 | 
1028 |    /* Same definition as retro_get_system_info(). */
1029 |    bool need_fullpath;
1030 | 
1031 |    /* Same definition as retro_get_system_info(). */
1032 |    bool block_extract;
1033 | 
1034 |    /* This is set if the content is required to load a game. 
1035 |     * If this is set to false, a zeroed-out retro_game_info can be passed. */
1036 |    bool required;
1037 | 
1038 |    /* Content can have multiple associated persistent 
1039 |     * memory types (retro_get_memory()). */
1040 |    const struct retro_subsystem_memory_info *memory;
1041 |    unsigned num_memory;
1042 | };
1043 | 
1044 | struct retro_subsystem_info
1045 | {
1046 |    /* Human-readable string of the subsystem type, e.g. "Super GameBoy" */
1047 |    const char *desc;
1048 | 
1049 |    /* A computer friendly short string identifier for the subsystem type.
1050 |     * This name must be [a-z].
1051 |     * E.g. if desc is "Super GameBoy", this can be "sgb".
1052 |     * This identifier can be used for command-line interfaces, etc.
1053 |     */
1054 |    const char *ident;
1055 | 
1056 |    /* Infos for each content file. The first entry is assumed to be the 
1057 |     * "most significant" content for frontend purposes.
1058 |     * E.g. with Super GameBoy, the first content should be the GameBoy ROM, 
1059 |     * as it is the most "significant" content to a user.
1060 |     * If a frontend creates new file paths based on the content used 
1061 |     * (e.g. savestates), it should use the path for the first ROM to do so. */
1062 |    const struct retro_subsystem_rom_info *roms;
1063 | 
1064 |    /* Number of content files associated with a subsystem. */
1065 |    unsigned num_roms;
1066 |    
1067 |    /* The type passed to retro_load_game_special(). */
1068 |    unsigned id;
1069 | };
1070 | 
1071 | typedef void (*retro_proc_address_t)(void);
1072 | 
1073 | /* libretro API extension functions:
1074 |  * (None here so far).
1075 |  *
1076 |  * Get a symbol from a libretro core.
1077 |  * Cores should only return symbols which are actual 
1078 |  * extensions to the libretro API.
1079 |  *
1080 |  * Frontends should not use this to obtain symbols to standard 
1081 |  * libretro entry points (static linking or dlsym).
1082 |  *
1083 |  * The symbol name must be equal to the function name, 
1084 |  * e.g. if void retro_foo(void); exists, the symbol must be called "retro_foo".
1085 |  * The returned function pointer must be cast to the corresponding type.
1086 |  */
1087 | typedef retro_proc_address_t (*retro_get_proc_address_t)(const char *sym);
1088 | 
1089 | struct retro_get_proc_address_interface
1090 | {
1091 |    retro_get_proc_address_t get_proc_address;
1092 | };
1093 | 
1094 | enum retro_log_level
1095 | {
1096 |    RETRO_LOG_DEBUG = 0,
1097 |    RETRO_LOG_INFO,
1098 |    RETRO_LOG_WARN,
1099 |    RETRO_LOG_ERROR,
1100 | 
1101 |    RETRO_LOG_DUMMY = INT_MAX
1102 | };
1103 | 
1104 | /* Logging function. Takes log level argument as well. */
1105 | typedef void (*retro_log_printf_t)(enum retro_log_level level,
1106 |       const char *fmt, ...);
1107 | 
1108 | struct retro_log_callback
1109 | {
1110 |    retro_log_printf_t log;
1111 | };
1112 | 
1113 | /* Performance related functions */
1114 | 
1115 | /* ID values for SIMD CPU features */
1116 | #define RETRO_SIMD_SSE      (1 << 0)
1117 | #define RETRO_SIMD_SSE2     (1 << 1)
1118 | #define RETRO_SIMD_VMX      (1 << 2)
1119 | #define RETRO_SIMD_VMX128   (1 << 3)
1120 | #define RETRO_SIMD_AVX      (1 << 4)
1121 | #define RETRO_SIMD_NEON     (1 << 5)
1122 | #define RETRO_SIMD_SSE3     (1 << 6)
1123 | #define RETRO_SIMD_SSSE3    (1 << 7)
1124 | #define RETRO_SIMD_MMX      (1 << 8)
1125 | #define RETRO_SIMD_MMXEXT   (1 << 9)
1126 | #define RETRO_SIMD_SSE4     (1 << 10)
1127 | #define RETRO_SIMD_SSE42    (1 << 11)
1128 | #define RETRO_SIMD_AVX2     (1 << 12)
1129 | #define RETRO_SIMD_VFPU     (1 << 13)
1130 | #define RETRO_SIMD_PS       (1 << 14)
1131 | #define RETRO_SIMD_AES      (1 << 15)
1132 | 
1133 | typedef uint64_t retro_perf_tick_t;
1134 | typedef int64_t retro_time_t;
1135 | 
1136 | struct retro_perf_counter
1137 | {
1138 |    const char *ident;
1139 |    retro_perf_tick_t start;
1140 |    retro_perf_tick_t total;
1141 |    retro_perf_tick_t call_cnt;
1142 | 
1143 |    bool registered;
1144 | };
1145 | 
1146 | /* Returns current time in microseconds.
1147 |  * Tries to use the most accurate timer available.
1148 |  */
1149 | typedef retro_time_t (*retro_perf_get_time_usec_t)(void);
1150 | 
1151 | /* A simple counter. Usually nanoseconds, but can also be CPU cycles.
1152 |  * Can be used directly if desired (when creating a more sophisticated 
1153 |  * performance counter system).
1154 |  * */
1155 | typedef retro_perf_tick_t (*retro_perf_get_counter_t)(void);
1156 | 
1157 | /* Returns a bit-mask of detected CPU features (RETRO_SIMD_*). */
1158 | typedef uint64_t (*retro_get_cpu_features_t)(void);
1159 | 
1160 | /* Asks frontend to log and/or display the state of performance counters.
1161 |  * Performance counters can always be poked into manually as well.
1162 |  */
1163 | typedef void (*retro_perf_log_t)(void);
1164 | 
1165 | /* Register a performance counter.
1166 |  * ident field must be set with a discrete value and other values in 
1167 |  * retro_perf_counter must be 0.
1168 |  * Registering can be called multiple times. To avoid calling to 
1169 |  * frontend redundantly, you can check registered field first. */
1170 | typedef void (*retro_perf_register_t)(struct retro_perf_counter *counter);
1171 | 
1172 | /* Starts a registered counter. */
1173 | typedef void (*retro_perf_start_t)(struct retro_perf_counter *counter);
1174 | 
1175 | /* Stops a registered counter. */
1176 | typedef void (*retro_perf_stop_t)(struct retro_perf_counter *counter);
1177 | 
1178 | /* For convenience it can be useful to wrap register, start and stop in macros.
1179 |  * E.g.:
1180 |  * #ifdef LOG_PERFORMANCE
1181 |  * #define RETRO_PERFORMANCE_INIT(perf_cb, name) static struct retro_perf_counter name = {#name}; if (!name.registered) perf_cb.perf_register(&(name))
1182 |  * #define RETRO_PERFORMANCE_START(perf_cb, name) perf_cb.perf_start(&(name))
1183 |  * #define RETRO_PERFORMANCE_STOP(perf_cb, name) perf_cb.perf_stop(&(name))
1184 |  * #else
1185 |  * ... Blank macros ...
1186 |  * #endif
1187 |  *
1188 |  * These can then be used mid-functions around code snippets.
1189 |  *
1190 |  * extern struct retro_perf_callback perf_cb;  * Somewhere in the core.
1191 |  *
1192 |  * void do_some_heavy_work(void)
1193 |  * {
1194 |  *    RETRO_PERFORMANCE_INIT(cb, work_1;
1195 |  *    RETRO_PERFORMANCE_START(cb, work_1);
1196 |  *    heavy_work_1();
1197 |  *    RETRO_PERFORMANCE_STOP(cb, work_1);
1198 |  *
1199 |  *    RETRO_PERFORMANCE_INIT(cb, work_2);
1200 |  *    RETRO_PERFORMANCE_START(cb, work_2);
1201 |  *    heavy_work_2();
1202 |  *    RETRO_PERFORMANCE_STOP(cb, work_2);
1203 |  * }
1204 |  *
1205 |  * void retro_deinit(void)
1206 |  * {
1207 |  *    perf_cb.perf_log();  * Log all perf counters here for example.
1208 |  * }
1209 |  */
1210 | 
1211 | struct retro_perf_callback
1212 | {
1213 |    retro_perf_get_time_usec_t    get_time_usec;
1214 |    retro_get_cpu_features_t      get_cpu_features;
1215 | 
1216 |    retro_perf_get_counter_t      get_perf_counter;
1217 |    retro_perf_register_t         perf_register;
1218 |    retro_perf_start_t            perf_start;
1219 |    retro_perf_stop_t             perf_stop;
1220 |    retro_perf_log_t              perf_log;
1221 | };
1222 | 
1223 | /* FIXME: Document the sensor API and work out behavior.
1224 |  * It will be marked as experimental until then.
1225 |  */
1226 | enum retro_sensor_action
1227 | {
1228 |    RETRO_SENSOR_ACCELEROMETER_ENABLE = 0,
1229 |    RETRO_SENSOR_ACCELEROMETER_DISABLE,
1230 | 
1231 |    RETRO_SENSOR_DUMMY = INT_MAX
1232 | };
1233 | 
1234 | /* Id values for SENSOR types. */
1235 | #define RETRO_SENSOR_ACCELEROMETER_X 0
1236 | #define RETRO_SENSOR_ACCELEROMETER_Y 1
1237 | #define RETRO_SENSOR_ACCELEROMETER_Z 2
1238 | 
1239 | typedef bool (*retro_set_sensor_state_t)(unsigned port, 
1240 |       enum retro_sensor_action action, unsigned rate);
1241 | 
1242 | typedef float (*retro_sensor_get_input_t)(unsigned port, unsigned id);
1243 | 
1244 | struct retro_sensor_interface
1245 | {
1246 |    retro_set_sensor_state_t set_sensor_state;
1247 |    retro_sensor_get_input_t get_sensor_input;
1248 | };
1249 | 
1250 | enum retro_camera_buffer
1251 | {
1252 |    RETRO_CAMERA_BUFFER_OPENGL_TEXTURE = 0,
1253 |    RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER,
1254 | 
1255 |    RETRO_CAMERA_BUFFER_DUMMY = INT_MAX
1256 | };
1257 | 
1258 | /* Starts the camera driver. Can only be called in retro_run(). */
1259 | typedef bool (*retro_camera_start_t)(void);
1260 | 
1261 | /* Stops the camera driver. Can only be called in retro_run(). */
1262 | typedef void (*retro_camera_stop_t)(void);
1263 | 
1264 | /* Callback which signals when the camera driver is initialized 
1265 |  * and/or deinitialized.
1266 |  * retro_camera_start_t can be called in initialized callback.
1267 |  */
1268 | typedef void (*retro_camera_lifetime_status_t)(void);
1269 | 
1270 | /* A callback for raw framebuffer data. buffer points to an XRGB8888 buffer.
1271 |  * Width, height and pitch are similar to retro_video_refresh_t.
1272 |  * First pixel is top-left origin.
1273 |  */
1274 | typedef void (*retro_camera_frame_raw_framebuffer_t)(const uint32_t *buffer, 
1275 |       unsigned width, unsigned height, size_t pitch);
1276 | 
1277 | /* A callback for when OpenGL textures are used.
1278 |  *
1279 |  * texture_id is a texture owned by camera driver.
1280 |  * Its state or content should be considered immutable, except for things like 
1281 |  * texture filtering and clamping.
1282 |  *
1283 |  * texture_target is the texture target for the GL texture.
1284 |  * These can include e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE, and possibly 
1285 |  * more depending on extensions.
1286 |  *
1287 |  * affine points to a packed 3x3 column-major matrix used to apply an affine 
1288 |  * transform to texture coordinates. (affine_matrix * vec3(coord_x, coord_y, 1.0))
1289 |  * After transform, normalized texture coord (0, 0) should be bottom-left 
1290 |  * and (1, 1) should be top-right (or (width, height) for RECTANGLE).
1291 |  *
1292 |  * GL-specific typedefs are avoided here to avoid relying on gl.h in 
1293 |  * the API definition.
1294 |  */
1295 | typedef void (*retro_camera_frame_opengl_texture_t)(unsigned texture_id, 
1296 |       unsigned texture_target, const float *affine);
1297 | 
1298 | struct retro_camera_callback
1299 | {
1300 |    /* Set by libretro core. 
1301 |     * Example bitmask: caps = (1 << RETRO_CAMERA_BUFFER_OPENGL_TEXTURE) | (1 << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER).
1302 |     */
1303 |    uint64_t caps; 
1304 | 
1305 |    unsigned width; /* Desired resolution for camera. Is only used as a hint. */
1306 |    unsigned height;
1307 |    retro_camera_start_t start; /* Set by frontend. */
1308 |    retro_camera_stop_t stop; /* Set by frontend. */
1309 | 
1310 |    /* Set by libretro core if raw framebuffer callbacks will be used. */
1311 |    retro_camera_frame_raw_framebuffer_t frame_raw_framebuffer;
1312 |    /* Set by libretro core if OpenGL texture callbacks will be used. */
1313 |    retro_camera_frame_opengl_texture_t frame_opengl_texture; 
1314 | 
1315 |    /* Set by libretro core. Called after camera driver is initialized and 
1316 |     * ready to be started.
1317 |     * Can be NULL, in which this callback is not called.
1318 |     */
1319 |    retro_camera_lifetime_status_t initialized;
1320 | 
1321 |    /* Set by libretro core. Called right before camera driver is 
1322 |     * deinitialized.
1323 |     * Can be NULL, in which this callback is not called.
1324 |     */
1325 |    retro_camera_lifetime_status_t deinitialized;
1326 | };
1327 | 
1328 | /* Sets the interval of time and/or distance at which to update/poll 
1329 |  * location-based data.
1330 |  *
1331 |  * To ensure compatibility with all location-based implementations,
1332 |  * values for both interval_ms and interval_distance should be provided.
1333 |  *
1334 |  * interval_ms is the interval expressed in milliseconds.
1335 |  * interval_distance is the distance interval expressed in meters.
1336 |  */
1337 | typedef void (*retro_location_set_interval_t)(unsigned interval_ms,
1338 |       unsigned interval_distance);
1339 | 
1340 | /* Start location services. The device will start listening for changes to the
1341 |  * current location at regular intervals (which are defined with 
1342 |  * retro_location_set_interval_t). */
1343 | typedef bool (*retro_location_start_t)(void);
1344 | 
1345 | /* Stop location services. The device will stop listening for changes 
1346 |  * to the current location. */
1347 | typedef void (*retro_location_stop_t)(void);
1348 | 
1349 | /* Get the position of the current location. Will set parameters to 
1350 |  * 0 if no new  location update has happened since the last time. */
1351 | typedef bool (*retro_location_get_position_t)(double *lat, double *lon,
1352 |       double *horiz_accuracy, double *vert_accuracy);
1353 | 
1354 | /* Callback which signals when the location driver is initialized 
1355 |  * and/or deinitialized.
1356 |  * retro_location_start_t can be called in initialized callback.
1357 |  */
1358 | typedef void (*retro_location_lifetime_status_t)(void);
1359 | 
1360 | struct retro_location_callback
1361 | {
1362 |    retro_location_start_t         start;
1363 |    retro_location_stop_t          stop;
1364 |    retro_location_get_position_t  get_position;
1365 |    retro_location_set_interval_t  set_interval;
1366 | 
1367 |    retro_location_lifetime_status_t initialized;
1368 |    retro_location_lifetime_status_t deinitialized;
1369 | };
1370 | 
1371 | enum retro_rumble_effect
1372 | {
1373 |    RETRO_RUMBLE_STRONG = 0,
1374 |    RETRO_RUMBLE_WEAK = 1,
1375 | 
1376 |    RETRO_RUMBLE_DUMMY = INT_MAX
1377 | };
1378 | 
1379 | /* Sets rumble state for joypad plugged in port 'port'. 
1380 |  * Rumble effects are controlled independently,
1381 |  * and setting e.g. strong rumble does not override weak rumble.
1382 |  * Strength has a range of [0, 0xffff].
1383 |  *
1384 |  * Returns true if rumble state request was honored. 
1385 |  * Calling this before first retro_run() is likely to return false. */
1386 | typedef bool (*retro_set_rumble_state_t)(unsigned port, 
1387 |       enum retro_rumble_effect effect, uint16_t strength);
1388 | 
1389 | struct retro_rumble_interface
1390 | {
1391 |    retro_set_rumble_state_t set_rumble_state;
1392 | };
1393 | 
1394 | /* Notifies libretro that audio data should be written. */
1395 | typedef void (*retro_audio_callback_t)(void);
1396 | 
1397 | /* True: Audio driver in frontend is active, and callback is 
1398 |  * expected to be called regularily.
1399 |  * False: Audio driver in frontend is paused or inactive. 
1400 |  * Audio callback will not be called until set_state has been 
1401 |  * called with true.
1402 |  * Initial state is false (inactive).
1403 |  */
1404 | typedef void (*retro_audio_set_state_callback_t)(bool enabled);
1405 | 
1406 | struct retro_audio_callback
1407 | {
1408 |    retro_audio_callback_t callback;
1409 |    retro_audio_set_state_callback_t set_state;
1410 | };
1411 | 
1412 | /* Notifies a libretro core of time spent since last invocation 
1413 |  * of retro_run() in microseconds.
1414 |  *
1415 |  * It will be called right before retro_run() every frame.
1416 |  * The frontend can tamper with timing to support cases like 
1417 |  * fast-forward, slow-motion and framestepping.
1418 |  *
1419 |  * In those scenarios the reference frame time value will be used. */
1420 | typedef int64_t retro_usec_t;
1421 | typedef void (*retro_frame_time_callback_t)(retro_usec_t usec);
1422 | struct retro_frame_time_callback
1423 | {
1424 |    retro_frame_time_callback_t callback;
1425 |    /* Represents the time of one frame. It is computed as 
1426 |     * 1000000 / fps, but the implementation will resolve the 
1427 |     * rounding to ensure that framestepping, etc is exact. */
1428 |    retro_usec_t reference;
1429 | };
1430 | 
1431 | /* Pass this to retro_video_refresh_t if rendering to hardware.
1432 |  * Passing NULL to retro_video_refresh_t is still a frame dupe as normal.
1433 |  * */
1434 | #define RETRO_HW_FRAME_BUFFER_VALID ((void*)-1)
1435 | 
1436 | /* Invalidates the current HW context.
1437 |  * Any GL state is lost, and must not be deinitialized explicitly.
1438 |  * If explicit deinitialization is desired by the libretro core,
1439 |  * it should implement context_destroy callback.
1440 |  * If called, all GPU resources must be reinitialized.
1441 |  * Usually called when frontend reinits video driver.
1442 |  * Also called first time video driver is initialized, 
1443 |  * allowing libretro core to initialize resources.
1444 |  */
1445 | typedef void (*retro_hw_context_reset_t)(void);
1446 | 
1447 | /* Gets current framebuffer which is to be rendered to.
1448 |  * Could change every frame potentially.
1449 |  */
1450 | typedef uintptr_t (*retro_hw_get_current_framebuffer_t)(void);
1451 | 
1452 | /* Get a symbol from HW context. */
1453 | typedef retro_proc_address_t (*retro_hw_get_proc_address_t)(const char *sym);
1454 | 
1455 | enum retro_hw_context_type
1456 | {
1457 |    RETRO_HW_CONTEXT_NONE             = 0,
1458 |    /* OpenGL 2.x. Driver can choose to use latest compatibility context. */
1459 |    RETRO_HW_CONTEXT_OPENGL           = 1, 
1460 |    /* OpenGL ES 2.0. */
1461 |    RETRO_HW_CONTEXT_OPENGLES2        = 2,
1462 |    /* Modern desktop core GL context. Use version_major/
1463 |     * version_minor fields to set GL version. */
1464 |    RETRO_HW_CONTEXT_OPENGL_CORE      = 3,
1465 |    /* OpenGL ES 3.0 */
1466 |    RETRO_HW_CONTEXT_OPENGLES3        = 4,
1467 |    /* OpenGL ES 3.1+. Set version_major/version_minor. For GLES2 and GLES3,
1468 |     * use the corresponding enums directly. */
1469 |    RETRO_HW_CONTEXT_OPENGLES_VERSION = 5,
1470 | 
1471 |    RETRO_HW_CONTEXT_DUMMY = INT_MAX
1472 | };
1473 | 
1474 | /* Call video context driver's 'make current context' function */
1475 | typedef void (*retro_hw_make_current_context)(void);
1476 | 
1477 | struct retro_hw_make_current_context_callback
1478 | {
1479 |    /* Set by frontend. */
1480 |    retro_hw_make_current_context make_current_context;
1481 | };
1482 | 
1483 | struct retro_hw_render_callback
1484 | {
1485 |    /* Which API to use. Set by libretro core. */
1486 |    enum retro_hw_context_type context_type;
1487 | 
1488 |    /* Called when a context has been created or when it has been reset.
1489 |     * An OpenGL context is only valid after context_reset() has been called.
1490 |     *
1491 |     * When context_reset is called, OpenGL resources in the libretro 
1492 |     * implementation are guaranteed to be invalid.
1493 |     *
1494 |     * It is possible that context_reset is called multiple times during an 
1495 |     * application lifecycle.
1496 |     * If context_reset is called without any notification (context_destroy),
1497 |     * the OpenGL context was lost and resources should just be recreated
1498 |     * without any attempt to "free" old resources.
1499 |     */
1500 |    retro_hw_context_reset_t context_reset;
1501 | 
1502 |    /* Set by frontend. */
1503 |    retro_hw_get_current_framebuffer_t get_current_framebuffer;
1504 | 
1505 |    /* Set by frontend. */
1506 |    retro_hw_get_proc_address_t get_proc_address;
1507 | 
1508 |    /* Set if render buffers should have depth component attached. */
1509 |    bool depth;
1510 | 
1511 |    /* Set if stencil buffers should be attached. */
1512 |    bool stencil;
1513 | 
1514 |    /* If depth and stencil are true, a packed 24/8 buffer will be added. 
1515 |     * Only attaching stencil is invalid and will be ignored. */
1516 | 
1517 |    /* Use conventional bottom-left origin convention. If false, 
1518 |     * standard libretro top-left origin semantics are used. */
1519 |    bool bottom_left_origin;
1520 |    
1521 |    /* Major version number for core GL context or GLES 3.1+. */
1522 |    unsigned version_major;
1523 | 
1524 |    /* Minor version number for core GL context or GLES 3.1+. */
1525 |    unsigned version_minor;
1526 | 
1527 |    /* If this is true, the frontend will go very far to avoid 
1528 |     * resetting context in scenarios like toggling fullscreen, etc.
1529 |     */
1530 |    bool cache_context;
1531 | 
1532 |    /* The reset callback might still be called in extreme situations 
1533 |     * such as if the context is lost beyond recovery.
1534 |     *
1535 |     * For optimal stability, set this to false, and allow context to be 
1536 |     * reset at any time.
1537 |     */
1538 |    
1539 |    /* A callback to be called before the context is destroyed in a 
1540 |     * controlled way by the frontend. */
1541 |    retro_hw_context_reset_t context_destroy;
1542 | 
1543 |    /* OpenGL resources can be deinitialized cleanly at this step.
1544 |     * context_destroy can be set to NULL, in which resources will 
1545 |     * just be destroyed without any notification.
1546 |     *
1547 |     * Even when context_destroy is non-NULL, it is possible that 
1548 |     * context_reset is called without any destroy notification.
1549 |     * This happens if context is lost by external factors (such as 
1550 |     * notified by GL_ARB_robustness).
1551 |     *
1552 |     * In this case, the context is assumed to be already dead,
1553 |     * and the libretro implementation must not try to free any OpenGL 
1554 |     * resources in the subsequent context_reset.
1555 |     */
1556 | 
1557 |    /* Creates a debug context. */
1558 |    bool debug_context;
1559 | };
1560 | 
1561 | /* Callback type passed in RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK. 
1562 |  * Called by the frontend in response to keyboard events.
1563 |  * down is set if the key is being pressed, or false if it is being released.
1564 |  * keycode is the RETROK value of the char.
1565 |  * character is the text character of the pressed key. (UTF-32).
1566 |  * key_modifiers is a set of RETROKMOD values or'ed together.
1567 |  *
1568 |  * The pressed/keycode state can be indepedent of the character.
1569 |  * It is also possible that multiple characters are generated from a 
1570 |  * single keypress.
1571 |  * Keycode events should be treated separately from character events.
1572 |  * However, when possible, the frontend should try to synchronize these.
1573 |  * If only a character is posted, keycode should be RETROK_UNKNOWN.
1574 |  *
1575 |  * Similarily if only a keycode event is generated with no corresponding 
1576 |  * character, character should be 0.
1577 |  */
1578 | typedef void (*retro_keyboard_event_t)(bool down, unsigned keycode, 
1579 |       uint32_t character, uint16_t key_modifiers);
1580 | 
1581 | struct retro_keyboard_callback
1582 | {
1583 |    retro_keyboard_event_t callback;
1584 | };
1585 | 
1586 | /* Callbacks for RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE.
1587 |  * Should be set for implementations which can swap out multiple disk 
1588 |  * images in runtime.
1589 |  *
1590 |  * If the implementation can do this automatically, it should strive to do so.
1591 |  * However, there are cases where the user must manually do so.
1592 |  *
1593 |  * Overview: To swap a disk image, eject the disk image with 
1594 |  * set_eject_state(true).
1595 |  * Set the disk index with set_image_index(index). Insert the disk again 
1596 |  * with set_eject_state(false).
1597 |  */
1598 | 
1599 | /* If ejected is true, "ejects" the virtual disk tray.
1600 |  * When ejected, the disk image index can be set.
1601 |  */
1602 | typedef bool (*retro_set_eject_state_t)(bool ejected);
1603 | 
1604 | /* Gets current eject state. The initial state is 'not ejected'. */
1605 | typedef bool (*retro_get_eject_state_t)(void);
1606 | 
1607 | /* Gets current disk index. First disk is index 0.
1608 |  * If return value is >= get_num_images(), no disk is currently inserted.
1609 |  */
1610 | typedef unsigned (*retro_get_image_index_t)(void);
1611 | 
1612 | /* Sets image index. Can only be called when disk is ejected.
1613 |  * The implementation supports setting "no disk" by using an 
1614 |  * index >= get_num_images().
1615 |  */
1616 | typedef bool (*retro_set_image_index_t)(unsigned index);
1617 | 
1618 | /* Gets total number of images which are available to use. */
1619 | typedef unsigned (*retro_get_num_images_t)(void);
1620 | 
1621 | struct retro_game_info;
1622 | 
1623 | /* Replaces the disk image associated with index.
1624 |  * Arguments to pass in info have same requirements as retro_load_game().
1625 |  * Virtual disk tray must be ejected when calling this.
1626 |  *
1627 |  * Replacing a disk image with info = NULL will remove the disk image 
1628 |  * from the internal list.
1629 |  * As a result, calls to get_image_index() can change.
1630 |  *
1631 |  * E.g. replace_image_index(1, NULL), and previous get_image_index() 
1632 |  * returned 4 before.
1633 |  * Index 1 will be removed, and the new index is 3.
1634 |  */
1635 | typedef bool (*retro_replace_image_index_t)(unsigned index,
1636 |       const struct retro_game_info *info);
1637 | 
1638 | /* Adds a new valid index (get_num_images()) to the internal disk list.
1639 |  * This will increment subsequent return values from get_num_images() by 1.
1640 |  * This image index cannot be used until a disk image has been set 
1641 |  * with replace_image_index. */
1642 | typedef bool (*retro_add_image_index_t)(void);
1643 | 
1644 | struct retro_disk_control_callback
1645 | {
1646 |    retro_set_eject_state_t set_eject_state;
1647 |    retro_get_eject_state_t get_eject_state;
1648 | 
1649 |    retro_get_image_index_t get_image_index;
1650 |    retro_set_image_index_t set_image_index;
1651 |    retro_get_num_images_t  get_num_images;
1652 | 
1653 |    retro_replace_image_index_t replace_image_index;
1654 |    retro_add_image_index_t add_image_index;
1655 | };
1656 | 
1657 | enum retro_pixel_format
1658 | {
1659 |    /* 0RGB1555, native endian.
1660 |     * 0 bit must be set to 0.
1661 |     * This pixel format is default for compatibility concerns only.
1662 |     * If a 15/16-bit pixel format is desired, consider using RGB565. */
1663 |    RETRO_PIXEL_FORMAT_0RGB1555 = 0,
1664 | 
1665 |    /* XRGB8888, native endian.
1666 |     * X bits are ignored. */
1667 |    RETRO_PIXEL_FORMAT_XRGB8888 = 1,
1668 | 
1669 |    /* RGB565, native endian.
1670 |     * This pixel format is the recommended format to use if a 15/16-bit
1671 |     * format is desired as it is the pixel format that is typically 
1672 |     * available on a wide range of low-power devices.
1673 |     *
1674 |     * It is also natively supported in APIs like OpenGL ES. */
1675 |    RETRO_PIXEL_FORMAT_RGB565   = 2,
1676 | 
1677 |    /* Ensure sizeof() == sizeof(int). */
1678 |    RETRO_PIXEL_FORMAT_UNKNOWN  = INT_MAX
1679 | };
1680 | 
1681 | struct retro_message
1682 | {
1683 |    const char *msg;        /* Message to be displayed. */
1684 |    unsigned    frames;     /* Duration in frames of message. */
1685 | };
1686 | 
1687 | /* Describes how the libretro implementation maps a libretro input bind
1688 |  * to its internal input system through a human readable string.
1689 |  * This string can be used to better let a user configure input. */
1690 | struct retro_input_descriptor
1691 | {
1692 |    /* Associates given parameters with a description. */
1693 |    unsigned port;
1694 |    unsigned device;
1695 |    unsigned index;
1696 |    unsigned id;
1697 | 
1698 |    /* Human readable description for parameters.
1699 |     * The pointer must remain valid until
1700 |     * retro_unload_game() is called. */
1701 |    const char *description; 
1702 | };
1703 | 
1704 | struct retro_system_info
1705 | {
1706 |    /* All pointers are owned by libretro implementation, and pointers must 
1707 |     * remain valid until retro_deinit() is called. */
1708 | 
1709 |    const char *library_name;      /* Descriptive name of library. Should not 
1710 |                                    * contain any version numbers, etc. */
1711 |    const char *library_version;   /* Descriptive version of core. */
1712 | 
1713 |    const char *valid_extensions;  /* A string listing probably content 
1714 |                                    * extensions the core will be able to 
1715 |                                    * load, separated with pipe.
1716 |                                    * I.e. "bin|rom|iso".
1717 |                                    * Typically used for a GUI to filter 
1718 |                                    * out extensions. */
1719 | 
1720 |    /* If true, retro_load_game() is guaranteed to provide a valid pathname 
1721 |     * in retro_game_info::path.
1722 |     * ::data and ::size are both invalid.
1723 |     *
1724 |     * If false, ::data and ::size are guaranteed to be valid, but ::path 
1725 |     * might not be valid.
1726 |     *
1727 |     * This is typically set to true for libretro implementations that must 
1728 |     * load from file.
1729 |     * Implementations should strive for setting this to false, as it allows 
1730 |     * the frontend to perform patching, etc. */
1731 |    bool        need_fullpath;                                       
1732 | 
1733 |    /* If true, the frontend is not allowed to extract any archives before 
1734 |     * loading the real content.
1735 |     * Necessary for certain libretro implementations that load games 
1736 |     * from zipped archives. */
1737 |    bool        block_extract;     
1738 | };
1739 | 
1740 | struct retro_game_geometry
1741 | {
1742 |    unsigned base_width;    /* Nominal video width of game. */
1743 |    unsigned base_height;   /* Nominal video height of game. */
1744 |    unsigned max_width;     /* Maximum possible width of game. */
1745 |    unsigned max_height;    /* Maximum possible height of game. */
1746 | 
1747 |    float    aspect_ratio;  /* Nominal aspect ratio of game. If
1748 |                             * aspect_ratio is <= 0.0, an aspect ratio
1749 |                             * of base_width / base_height is assumed.
1750 |                             * A frontend could override this setting,
1751 |                             * if desired. */
1752 | };
1753 | 
1754 | struct retro_system_timing
1755 | {
1756 |    double fps;             /* FPS of video content. */
1757 |    double sample_rate;     /* Sampling rate of audio. */
1758 | };
1759 | 
1760 | struct retro_system_av_info
1761 | {
1762 |    struct retro_game_geometry geometry;
1763 |    struct retro_system_timing timing;
1764 | };
1765 | 
1766 | struct retro_variable
1767 | {
1768 |    /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE.
1769 |     * If NULL, obtains the complete environment string if more 
1770 |     * complex parsing is necessary.
1771 |     * The environment string is formatted as key-value pairs 
1772 |     * delimited by semicolons as so:
1773 |     * "key1=value1;key2=value2;..."
1774 |     */
1775 |    const char *key;
1776 |    
1777 |    /* Value to be obtained. If key does not exist, it is set to NULL. */
1778 |    const char *value;
1779 | };
1780 | 
1781 | struct retro_game_info
1782 | {
1783 |    const char *path;       /* Path to game, UTF-8 encoded.
1784 |                             * Usually used as a reference.
1785 |                             * May be NULL if rom was loaded from stdin
1786 |                             * or similar. 
1787 |                             * retro_system_info::need_fullpath guaranteed 
1788 |                             * that this path is valid. */
1789 |    const void *data;       /* Memory buffer of loaded game. Will be NULL 
1790 |                             * if need_fullpath was set. */
1791 |    size_t      size;       /* Size of memory buffer. */
1792 |    const char *meta;       /* String of implementation specific meta-data. */
1793 | };
1794 | 
1795 | /* Callbacks */
1796 | 
1797 | /* Environment callback. Gives implementations a way of performing 
1798 |  * uncommon tasks. Extensible. */
1799 | typedef bool (*retro_environment_t)(unsigned cmd, void *data);
1800 | 
1801 | /* Render a frame. Pixel format is 15-bit 0RGB1555 native endian 
1802 |  * unless changed (see RETRO_ENVIRONMENT_SET_PIXEL_FORMAT).
1803 |  *
1804 |  * Width and height specify dimensions of buffer.
1805 |  * Pitch specifices length in bytes between two lines in buffer.
1806 |  *
1807 |  * For performance reasons, it is highly recommended to have a frame 
1808 |  * that is packed in memory, i.e. pitch == width * byte_per_pixel.
1809 |  * Certain graphic APIs, such as OpenGL ES, do not like textures 
1810 |  * that are not packed in memory.
1811 |  */
1812 | typedef void (*retro_video_refresh_t)(const void *data, unsigned width,
1813 |       unsigned height, size_t pitch);
1814 | 
1815 | /* Renders a single audio frame. Should only be used if implementation 
1816 |  * generates a single sample at a time.
1817 |  * Format is signed 16-bit native endian.
1818 |  */
1819 | typedef void (*retro_audio_sample_t)(int16_t left, int16_t right);
1820 | 
1821 | /* Renders multiple audio frames in one go.
1822 |  *
1823 |  * One frame is defined as a sample of left and right channels, interleaved.
1824 |  * I.e. int16_t buf[4] = { l, r, l, r }; would be 2 frames.
1825 |  * Only one of the audio callbacks must ever be used.
1826 |  */
1827 | typedef size_t (*retro_audio_sample_batch_t)(const int16_t *data,
1828 |       size_t frames);
1829 | 
1830 | /* Polls input. */
1831 | typedef void (*retro_input_poll_t)(void);
1832 | 
1833 | /* Queries for input for player 'port'. device will be masked with 
1834 |  * RETRO_DEVICE_MASK.
1835 |  *
1836 |  * Specialization of devices such as RETRO_DEVICE_JOYPAD_MULTITAP that 
1837 |  * have been set with retro_set_controller_port_device()
1838 |  * will still use the higher level RETRO_DEVICE_JOYPAD to request input.
1839 |  */
1840 | typedef int16_t (*retro_input_state_t)(unsigned port, unsigned device, 
1841 |       unsigned index, unsigned id);
1842 | 
1843 | /* Sets callbacks. retro_set_environment() is guaranteed to be called 
1844 |  * before retro_init().
1845 |  *
1846 |  * The rest of the set_* functions are guaranteed to have been called 
1847 |  * before the first call to retro_run() is made. */
1848 | void retro_set_environment(retro_environment_t);
1849 | void retro_set_video_refresh(retro_video_refresh_t);
1850 | void retro_set_audio_sample(retro_audio_sample_t);
1851 | void retro_set_audio_sample_batch(retro_audio_sample_batch_t);
1852 | void retro_set_input_poll(retro_input_poll_t);
1853 | void retro_set_input_state(retro_input_state_t);
1854 | 
1855 | /* Library global initialization/deinitialization. */
1856 | void retro_init(void);
1857 | void retro_deinit(void);
1858 | 
1859 | /* Must return RETRO_API_VERSION. Used to validate ABI compatibility
1860 |  * when the API is revised. */
1861 | unsigned retro_api_version(void);
1862 | 
1863 | /* Gets statically known system info. Pointers provided in *info 
1864 |  * must be statically allocated.
1865 |  * Can be called at any time, even before retro_init(). */
1866 | void retro_get_system_info(struct retro_system_info *info);
1867 | 
1868 | /* Gets information about system audio/video timings and geometry.
1869 |  * Can be called only after retro_load_game() has successfully completed.
1870 |  * NOTE: The implementation of this function might not initialize every 
1871 |  * variable if needed.
1872 |  * E.g. geom.aspect_ratio might not be initialized if core doesn't 
1873 |  * desire a particular aspect ratio. */
1874 | void retro_get_system_av_info(struct retro_system_av_info *info);
1875 | 
1876 | /* Sets device to be used for player 'port'.
1877 |  * By default, RETRO_DEVICE_JOYPAD is assumed to be plugged into all 
1878 |  * available ports.
1879 |  * Setting a particular device type is not a guarantee that libretro cores 
1880 |  * will only poll input based on that particular device type. It is only a 
1881 |  * hint to the libretro core when a core cannot automatically detect the 
1882 |  * appropriate input device type on its own. It is also relevant when a 
1883 |  * core can change its behavior depending on device type. */
1884 | void retro_set_controller_port_device(unsigned port, unsigned device);
1885 | 
1886 | /* Resets the current game. */
1887 | void retro_reset(void);
1888 | 
1889 | /* Runs the game for one video frame.
1890 |  * During retro_run(), input_poll callback must be called at least once.
1891 |  * 
1892 |  * If a frame is not rendered for reasons where a game "dropped" a frame,
1893 |  * this still counts as a frame, and retro_run() should explicitly dupe 
1894 |  * a frame if GET_CAN_DUPE returns true.
1895 |  * In this case, the video callback can take a NULL argument for data.
1896 |  */
1897 | void retro_run(void);
1898 | 
1899 | /* Returns the amount of data the implementation requires to serialize 
1900 |  * internal state (save states).
1901 |  * Between calls to retro_load_game() and retro_unload_game(), the 
1902 |  * returned size is never allowed to be larger than a previous returned 
1903 |  * value, to ensure that the frontend can allocate a save state buffer once.
1904 |  */
1905 | size_t retro_serialize_size(void);
1906 | 
1907 | /* Serializes internal state. If failed, or size is lower than
1908 |  * retro_serialize_size(), it should return false, true otherwise. */
1909 | bool retro_serialize(void *data, size_t size);
1910 | bool retro_unserialize(const void *data, size_t size);
1911 | 
1912 | void retro_cheat_reset(void);
1913 | void retro_cheat_set(unsigned index, bool enabled, const char *code);
1914 | 
1915 | /* Loads a game. */
1916 | bool retro_load_game(const struct retro_game_info *game);
1917 | 
1918 | /* Loads a "special" kind of game. Should not be used,
1919 |  * except in extreme cases. */
1920 | bool retro_load_game_special(
1921 |   unsigned game_type,
1922 |   const struct retro_game_info *info, size_t num_info
1923 | );
1924 | 
1925 | /* Unloads a currently loaded game. */
1926 | void retro_unload_game(void);
1927 | 
1928 | /* Gets region of game. */
1929 | unsigned retro_get_region(void);
1930 | 
1931 | /* Gets region of memory. */
1932 | void *retro_get_memory_data(unsigned id);
1933 | size_t retro_get_memory_size(unsigned id);
1934 | 
1935 | #ifdef __cplusplus
1936 | }
1937 | #endif
1938 | 
1939 | #endif
1940 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "arch.js",
 3 |   "description": "Emscripten + Libretro = ♥",
 4 |   "version": "1.1.0",
 5 |   "scripts": {
 6 |     "build": "find . \\( -name 'Makefile.*' -a -not -name 'Makefile.common' \\) -exec emmake make -f {} \\;",
 7 |     "prepublish": "npm run build",
 8 |     "gh-pages": "(git checkout gh-pages && git reset --hard master && npm run build && git add -f build && git commit -m gh-pages && git push -f --set-upstream origin gh-pages && git checkout -)"
 9 |   },
10 |   "peerDependencies": {
11 |     "virtjs": "^0.3.4"
12 |   }
13 | }
14 | 


--------------------------------------------------------------------------------
/sources/bridge_retro.c:
--------------------------------------------------------------------------------
 1 | #include <stdarg.h>
 2 | #include <stdint.h>
 3 | #include <stdio.h>
 4 | 
 5 | #include <libretro.h>
 6 | 
 7 | #include "./bridge_retro.h"
 8 | #include "./bridge_virtjs.h"
 9 | #include "./input_formats.h"
10 | 
11 | void bridge_retro_log(enum retro_log_level level, char const * format, ...)
12 | {
13 |     va_list args;
14 |     va_start(args, format);
15 |     vfprintf(stderr, format, args);
16 |     va_end(args);
17 | }
18 | 
19 | bool bridge_retro_environment(unsigned command, void * data)
20 | {
21 |     switch (command) {
22 | 
23 |     default:
24 |         return false;
25 | 
26 |     case RETRO_ENVIRONMENT_GET_LOG_INTERFACE: {
27 | 
28 |         ((struct retro_log_callback *) data)->log = bridge_retro_log;
29 | 
30 |         return true;
31 | 
32 |     } break ;
33 | 
34 |     case RETRO_ENVIRONMENT_GET_CAN_DUPE: {
35 | 
36 |         *(bool*) data = true;
37 | 
38 |         return true;
39 | 
40 |     } break ;
41 | 
42 |     case RETRO_ENVIRONMENT_SET_PIXEL_FORMAT: {
43 | 
44 |         enum retro_pixel_format const * retro_pixel_format = (enum retro_pixel_format *) data;
45 |         struct input_format const * input_format = get_input_format(*retro_pixel_format);
46 | 
47 |         if (!input_format || !bridge_virtjs_screen_validate_input_format(input_format->depth, input_format->r_mask, input_format->g_mask, input_format->b_mask, input_format->a_mask))
48 |             return false;
49 | 
50 |         bridge_virtjs_screen_set_input_format(input_format->depth, input_format->r_mask, input_format->g_mask, input_format->b_mask, input_format->a_mask);
51 |         return true;
52 | 
53 |     } break ;
54 | 
55 |     }
56 | }
57 | 
58 | void bridge_retro_video_refresh(void const * data, unsigned width, unsigned height, size_t pitch)
59 | {
60 |     bridge_virtjs_screen_set_input_size(width, height, pitch);
61 |     bridge_virtjs_screen_set_input_data(data);
62 | }
63 | 
64 | void bridge_retro_input_poll(void)
65 | {
66 |     bridge_virtjs_input_poll_inputs();
67 | }
68 | 
69 | int16_t bridge_retro_input_state(unsigned port, unsigned device, unsigned index, unsigned id)
70 | {
71 |     if (device != RETRO_DEVICE_JOYPAD || index != 0)
72 |         return 0;
73 | 
74 |     return bridge_virtjs_input_get_state(port, id);
75 | }
76 | 
77 | void bridge_retro_audio_sample(int16_t left, int16_t right)
78 | {
79 |     int16_t sample[] = { left, right };
80 | 
81 |     bridge_virtjs_audio_push_sample_batch(sample, 1);
82 | }
83 | 
84 | size_t bridge_retro_audio_sample_batch(int16_t const * samples, size_t count)
85 | {
86 |     bridge_virtjs_audio_push_sample_batch(samples, count);
87 | 
88 |     return count;
89 | }
90 | 


--------------------------------------------------------------------------------
/sources/bridge_retro.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <stdint.h>
 4 | 
 5 | #include <libretro.h>
 6 | 
 7 | void bridge_retro_log(enum retro_log_level level, char const * format, ...);
 8 | 
 9 | bool bridge_retro_environment(unsigned command, void * data);
10 | 
11 | void bridge_retro_video_refresh(void const * data, unsigned width, unsigned height, size_t pitch);
12 | 
13 | void bridge_retro_input_poll(void);
14 | 
15 | int16_t bridge_retro_input_state(unsigned port, unsigned device, unsigned index, unsigned id);
16 | 
17 | void bridge_retro_audio_sample(int16_t left, int16_t right);
18 | 
19 | size_t bridge_retro_audio_sample_batch(int16_t const * samples, size_t count);
20 | 


--------------------------------------------------------------------------------
/sources/bridge_virtjs.c:
--------------------------------------------------------------------------------
  1 | #include <assert.h>
  2 | #include <stdlib.h>
  3 | #include <string.h>
  4 | 
  5 | #include <SDL2/SDL.h>
  6 | #include <libretro.h>
  7 | 
  8 | #include "./bridge_virtjs.h"
  9 | #include "./frontend.h"
 10 | #include "./input_formats.h"
 11 | 
 12 | static void (*g_timer_callback)(void) = NULL;
 13 | static bool g_timer_is_running = false;
 14 | static bool g_timer_has_parent = false;
 15 | 
 16 | static SDL_Window * g_window = NULL;
 17 | static SDL_Surface * g_screen = NULL;
 18 | static SDL_Surface * g_pending = NULL;
 19 | 
 20 | static int16_t * g_audio_samples = NULL;
 21 | static size_t g_audio_sample_count = 0;
 22 | 
 23 | static unsigned g_input_width = 0;
 24 | static unsigned g_input_height = 0;
 25 | static unsigned g_input_pitch = 0;
 26 | 
 27 | struct input_format const * g_input_format = NULL;
 28 | 
 29 | static bool g_input_state[ 16 ] = { 0 };
 30 | 
 31 | static unsigned g_input_bindings[ ][ 2 ] = {
 32 | 
 33 |     { SDL_SCANCODE_RETURN, RETRO_DEVICE_ID_JOYPAD_START },
 34 | 
 35 |     { SDL_SCANCODE_A, RETRO_DEVICE_ID_JOYPAD_A },
 36 |     { SDL_SCANCODE_Q, RETRO_DEVICE_ID_JOYPAD_A },
 37 |     { SDL_SCANCODE_Z, RETRO_DEVICE_ID_JOYPAD_B },
 38 |     { SDL_SCANCODE_W, RETRO_DEVICE_ID_JOYPAD_B },
 39 | 
 40 |     { SDL_SCANCODE_LEFT, RETRO_DEVICE_ID_JOYPAD_LEFT },
 41 |     { SDL_SCANCODE_RIGHT, RETRO_DEVICE_ID_JOYPAD_RIGHT },
 42 |     { SDL_SCANCODE_UP, RETRO_DEVICE_ID_JOYPAD_UP },
 43 |     { SDL_SCANCODE_DOWN, RETRO_DEVICE_ID_JOYPAD_DOWN }
 44 | 
 45 | };
 46 | 
 47 | static void timer_iterate(void)
 48 | {
 49 |     Uint32 lastTime = SDL_GetTicks();
 50 | 
 51 |     void (*timer_callback)(void) = g_timer_callback;
 52 |     g_timer_callback = NULL;
 53 | 
 54 |     SDL_Event event;
 55 | 
 56 |     if (SDL_PollEvent(&event)) {
 57 |         if (event.type == SDL_QUIT) {
 58 |             bridge_virtjs_timer_stop(); return;
 59 |         } else if (event.type == SDL_KEYDOWN) switch (event.key.keysym.scancode) {
 60 |             case SDL_SCANCODE_ESCAPE: bridge_virtjs_timer_stop(); return;
 61 |             case SDL_SCANCODE_F1: if (frontend_save_state() < 0) fprintf(stderr, "Save failed\n"); break;
 62 |             case SDL_SCANCODE_F2: if (frontend_load_state() < 0) fprintf(stderr, "Load failed\n"); break;
 63 |             default: break;
 64 |         }
 65 |     }
 66 | 
 67 |     timer_callback();
 68 | 
 69 |     Uint32 currentTime = SDL_GetTicks();
 70 | 
 71 |     Uint32 obtained = currentTime - lastTime;
 72 |     Uint32 expected = 1000 / 60;
 73 | 
 74 |     if (obtained < expected) {
 75 |         SDL_Delay(expected - obtained);
 76 |     }
 77 | }
 78 | 
 79 | static void audio_write(int16_t const * samples, size_t count)
 80 | {
 81 |     SDL_LockAudio();
 82 | 
 83 |     int16_t * previous_samples = g_audio_samples;
 84 |     size_t previous_count = g_audio_sample_count;
 85 | 
 86 |     g_audio_sample_count = previous_count + count;
 87 |     g_audio_samples = calloc(g_audio_sample_count * 2, sizeof(int16_t));
 88 | 
 89 |     for (size_t index = 0; index < previous_count * 2; ++ index)
 90 |         g_audio_samples[ index ] = previous_samples[ index ];
 91 | 
 92 |     for (size_t index = 0; index < count * 2; ++ index)
 93 |         g_audio_samples[ previous_count * 2 + index ] = samples[ index ];
 94 | 
 95 |     free(previous_samples);
 96 | 
 97 |     SDL_UnlockAudio();
 98 | }
 99 | 
100 | static void audio_callback(void * userdata, Uint8 * stream, int length)
101 | {
102 |     int16_t * available_samples = g_audio_samples;
103 |     size_t available_sample_count = g_audio_sample_count;
104 | 
105 |     size_t requested_sample_count = length / 2 / 2;
106 |     size_t requested_byte_length = requested_sample_count * 2 * 2;
107 | 
108 |     size_t providen_sample_count = requested_sample_count < available_sample_count ? requested_sample_count : available_sample_count;
109 |     size_t providen_byte_length = providen_sample_count * 2 * 2;
110 | 
111 |     memcpy(stream, available_samples, providen_byte_length);
112 |     memset(stream + providen_byte_length, 0, requested_byte_length - providen_byte_length);
113 | 
114 |     g_audio_samples = NULL;
115 |     g_audio_sample_count = 0;
116 | 
117 |     if (providen_sample_count < available_sample_count)
118 |         audio_write(available_samples + providen_sample_count * 2, available_sample_count - providen_sample_count);
119 | 
120 |     free(available_samples);
121 | }
122 | 
123 | void bridge_virtjs_input_poll_inputs(void)
124 | {
125 |     uint8_t const * keyboard_state = SDL_GetKeyboardState(NULL);
126 | 
127 |     for (size_t t = 0, T = sizeof(g_input_bindings) / sizeof(*g_input_bindings); t < T; ++ t) {
128 | 
129 |         unsigned sdl_key_code = g_input_bindings[ t ][ 0 ];
130 |         unsigned retro_key_code = g_input_bindings[ t ][ 1 ];
131 | 
132 |         g_input_state[ retro_key_code ] = keyboard_state[ sdl_key_code ];
133 | 
134 |     }
135 | }
136 | 
137 | bool bridge_virtjs_input_get_state(unsigned port, unsigned key)
138 | {
139 |     if (port != 0)
140 |         return 0;
141 | 
142 |     return g_input_state[ key ];
143 | }
144 | 
145 | int bridge_virtjs_timer_next_tick(void (*callback)(void))
146 | {
147 |     assert(g_timer_callback == NULL);
148 | 
149 |     g_timer_callback = callback;
150 | 
151 |     return 1;
152 | }
153 | 
154 | void bridge_virtjs_timer_cancel_tick(int identifier)
155 | {
156 |     if (identifier != 1)
157 |         return ;
158 | 
159 |     g_timer_callback = NULL;
160 | }
161 | 
162 | void bridge_virtjs_timer_start(void)
163 | {
164 |     g_timer_is_running = true;
165 | 
166 |     if (g_timer_has_parent)
167 |         return ;
168 | 
169 |     g_timer_has_parent = true;
170 | 
171 |     while (g_timer_is_running)
172 |         timer_iterate();
173 | 
174 |     g_timer_has_parent = false;
175 | }
176 | 
177 | void bridge_virtjs_timer_stop(void)
178 | {
179 |     g_timer_is_running = false;
180 | }
181 | 
182 | bool bridge_virtjs_screen_validate_input_format(unsigned depth, uint32_t r_mask, uint32_t g_mask, uint32_t b_mask, uint32_t a_mask)
183 | {
184 |     return true;
185 | }
186 | 
187 | void bridge_virtjs_screen_set_input_format(unsigned depth, uint32_t r_mask, uint32_t g_mask, uint32_t b_mask, uint32_t a_mask)
188 | {
189 |     static struct input_format input_format;
190 |     g_input_format = &input_format;
191 | 
192 |     input_format.depth = depth;
193 | 
194 |     input_format.r_mask = r_mask;
195 |     input_format.g_mask = g_mask;
196 |     input_format.b_mask = b_mask;
197 |     input_format.a_mask = a_mask;
198 | }
199 | 
200 | void bridge_virtjs_screen_set_input_size(unsigned width, unsigned height, unsigned pitch)
201 | {
202 |     if (g_window && g_input_width == width && g_input_height == height && g_input_pitch == pitch)
203 |         return ;
204 | 
205 |     g_input_width = width;
206 |     g_input_height = height;
207 |     g_input_pitch = pitch;
208 | 
209 |     if (! g_window) {
210 | 
211 |         SDL_InitSubSystem(SDL_INIT_VIDEO);
212 |         SDL_ClearError();
213 | 
214 |         g_window = SDL_CreateWindow("archjs", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, g_input_width, g_input_height, SDL_WINDOW_SHOWN);
215 |         g_screen = SDL_GetWindowSurface(g_window);
216 | 
217 |     } else {
218 | 
219 |         SDL_SetWindowSize(g_window, g_input_width, g_input_height);
220 | 
221 |     }
222 | }
223 | 
224 | void bridge_virtjs_screen_set_input_data(void const * data)
225 | {
226 |     if (! data)
227 |         return ;
228 | 
229 |     g_pending = SDL_CreateRGBSurfaceFrom((void*) data, g_input_width, g_input_height, g_input_format->depth, g_input_pitch, g_input_format->r_mask, g_input_format->g_mask, g_input_format->b_mask, 0);
230 | }
231 | 
232 | void bridge_virtjs_screen_flush_screen(void)
233 | {
234 |     if (! g_pending)
235 |         return ;
236 | 
237 |     SDL_BlitSurface(g_pending, NULL, g_screen, NULL);
238 |     SDL_UpdateWindowSurface(g_window);
239 | 
240 |     SDL_FreeSurface(g_pending);
241 |     g_pending = NULL;
242 | }
243 | 
244 | bool bridge_virtjs_audio_validate_input_format(unsigned sample_rate)
245 | {
246 |     return true;
247 | }
248 | 
249 | void bridge_virtjs_audio_set_input_format(unsigned sample_rate)
250 | {
251 |     SDL_InitSubSystem(SDL_INIT_AUDIO);
252 | 
253 |     SDL_AudioSpec desired_spec;
254 |     SDL_AudioSpec obtained_spec;
255 | 
256 |     desired_spec.freq = sample_rate;
257 |     desired_spec.format = AUDIO_S16SYS;
258 |     desired_spec.channels = 2;
259 |     desired_spec.samples = 1024;
260 |     desired_spec.callback = audio_callback;
261 |     desired_spec.userdata = NULL;
262 | 
263 |     SDL_OpenAudio(&desired_spec, &obtained_spec);
264 | 
265 |     SDL_PauseAudio(0);
266 | 
267 | }
268 | 
269 | void bridge_virtjs_audio_push_sample_batch(int16_t const * samples, unsigned count)
270 | {
271 |     audio_write(samples, count);
272 | }
273 | 


--------------------------------------------------------------------------------
/sources/bridge_virtjs.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <stdint.h>
 4 | 
 5 | #include "./input_formats.h"
 6 | 
 7 | #ifdef __cplusplus
 8 | extern "C" {
 9 | #endif
10 | 
11 | void bridge_virtjs_input_poll_inputs(void);
12 | bool bridge_virtjs_input_get_state(unsigned device, unsigned code);
13 | 
14 | void bridge_virtjs_timer_start(void);
15 | void bridge_virtjs_timer_stop(void);
16 | int  bridge_virtjs_timer_next_tick(void (*callback)(void));
17 | void bridge_virtjs_timer_cancel_tick(int);
18 | 
19 | bool bridge_virtjs_screen_validate_input_format(unsigned depth, uint32_t r_mask, uint32_t g_mask, uint32_t b_mask, uint32_t a_mask);
20 | void bridge_virtjs_screen_set_input_format(unsigned depth, uint32_t r_mask, uint32_t g_mask, uint32_t b_mask, uint32_t a_mask);
21 | void bridge_virtjs_screen_set_input_size(unsigned width, unsigned height, unsigned pitch);
22 | void bridge_virtjs_screen_set_input_data(void const * data);
23 | void bridge_virtjs_screen_flush_screen(void);
24 | 
25 | bool bridge_virtjs_audio_validate_input_format(unsigned input_sample_rate);
26 | void bridge_virtjs_audio_set_input_format(unsigned input_sample_rate);
27 | void bridge_virtjs_audio_push_sample_batch(int16_t const * samples, unsigned count);
28 | 
29 | #ifdef __cplusplus
30 | }
31 | #endif
32 | 


--------------------------------------------------------------------------------
/sources/bridge_virtjs.js:
--------------------------------------------------------------------------------
  1 | mergeInto(LibraryManager.library, {
  2 | 
  3 |     $VirtjsBridge: {
  4 | 
  5 |         audioFormat: function (n) {
  6 | 
  7 |             return n / 0x8000;
  8 | 
  9 |         },
 10 | 
 11 |         getHeapFromDepth: function (depth) { switch (depth) {
 12 | 
 13 |             default: throw new Error('Invalid depth (' + depth + ')');
 14 | 
 15 |             case  8: return HEAPU8;
 16 |             case 16: return HEAPU16;
 17 |             case 32: return HEAPU32;
 18 | 
 19 |         } },
 20 | 
 21 |         castPointerToData: function (pointer, heap, count) {
 22 | 
 23 |             var bytesPerElement = heap.BYTES_PER_ELEMENT;
 24 | 
 25 |             var start = pointer / heap.BYTES_PER_ELEMENT;
 26 |             var end = start + count;
 27 | 
 28 |             return heap.subarray(start, end);
 29 | 
 30 |         }
 31 | 
 32 |     },
 33 | 
 34 |     bridge_virtjs_input_poll_inputs: function () {
 35 | 
 36 |         Module.input.pollInputs();
 37 | 
 38 |     },
 39 | 
 40 |     bridge_virtjs_input_get_state: function (port, inputCode) {
 41 | 
 42 |         return Module.input.getState(port, inputCode);
 43 | 
 44 |     },
 45 | 
 46 |     bridge_virtjs_timer_start: function () {
 47 | 
 48 |         Module.timer.start();
 49 | 
 50 |     },
 51 | 
 52 |     bridge_virtjs_timer_stop: function () {
 53 | 
 54 |         Module.timer.stop();
 55 | 
 56 |     },
 57 | 
 58 |     bridge_virtjs_timer_next_tick: function (pointer) {
 59 | 
 60 |         return Module.timer.nextTick(function () {
 61 |             Runtime.dynCall('v', pointer, []);
 62 |         });
 63 | 
 64 |     },
 65 | 
 66 |     bridge_virtjs_timer_cancel_tick: function (nextTickId) {
 67 | 
 68 |         Module.timer.cancelTick(nextTickId);
 69 | 
 70 |     },
 71 | 
 72 |     bridge_virtjs_screen_set_input_size: function (width, height, pitch) {
 73 | 
 74 |         Module.screen.setInputSize(width, height, pitch);
 75 | 
 76 |     },
 77 | 
 78 |     bridge_virtjs_screen_validate_input_format: function (depth, rMask, gMask, bMask, aMask) {
 79 | 
 80 |         return Module.screen.validateInputFormat({ depth: depth, rMask: rMask, gMask: gMask, bMask: bMask, aMask: aMask });
 81 | 
 82 |     },
 83 | 
 84 |     bridge_virtjs_screen_set_input_format: function (depth, rMask, gMask, bMask, aMask) {
 85 | 
 86 |         Module.screen.setInputFormat({ depth: depth, rMask: rMask, gMask: gMask, bMask: bMask, aMask: aMask });
 87 | 
 88 |     },
 89 | 
 90 |     bridge_virtjs_screen_set_input_data__deps: [ '$VirtjsBridge' ],
 91 |     bridge_virtjs_screen_set_input_data: function (dataPointer) {
 92 | 
 93 |         var heap = VirtjsBridge.getHeapFromDepth(Module.screen.inputFormat.depth);
 94 | 
 95 |         Module.screen.setInputData(VirtjsBridge.castPointerToData(dataPointer, heap, Module.screen.inputHeight * Module.screen.inputPitch));
 96 | 
 97 |     },
 98 | 
 99 |     bridge_virtjs_screen_flush_screen: function () {
100 | 
101 |         Module.screen.flushScreen();
102 | 
103 |     },
104 | 
105 |     bridge_virtjs_screen_set_input_data__deps: [ '$VirtjsBridge' ],
106 |     bridge_virtjs_audio_validate_input_format: function (sampleRate) {
107 | 
108 |         return Module.audio.validateInputFormat({ sampleRate: sampleRate, channelCount: 2, formatCallback: VirtjsBridge.audioFormat });
109 | 
110 |     },
111 | 
112 |     bridge_virtjs_screen_set_input_data__deps: [ '$VirtjsBridge' ],
113 |     bridge_virtjs_audio_set_input_format: function (sampleRate) {
114 | 
115 |         Module.audio.setInputFormat({ sampleRate: sampleRate, channelCount: 2, formatCallback: VirtjsBridge.audioFormat });
116 | 
117 |     },
118 | 
119 |     bridge_virtjs_audio_push_sample_batch: function (samplesPointer, count) {
120 | 
121 |         Module.audio.pushSampleBatch(VirtjsBridge.castPointerToData(samplesPointer, HEAP16, count * 2));
122 | 
123 |     }
124 | 
125 | });
126 | 


--------------------------------------------------------------------------------
/sources/epilogue.js:
--------------------------------------------------------------------------------
  1 | 
  2 |         return { Module: Module, FS: FS, Runtime: Runtime };
  3 | 
  4 |     });
  5 | 
  6 |     var Engine = function (options) {
  7 | 
  8 |         var devices = options.devices;
  9 | 
 10 |         this.defaultFileName = options.defaultFileName || '@(ENGINE_ROM_NAME)';
 11 | 
 12 |         this.emscripten = instanciateEmscripten();
 13 | 
 14 |         this.emscripten.print = function (message) { console.log(message); };
 15 |         this.emscripten.printErr = function (message) { console.error(message); };
 16 | 
 17 |         this.screen = this.emscripten.Module.screen = devices.screen;
 18 |         this.timer = this.emscripten.Module.timer = devices.timer;
 19 |         this.input = this.emscripten.Module.input = devices.input;
 20 |         this.audio = this.emscripten.Module.audio = devices.audio;
 21 | 
 22 |         this.lastCreatedFile = null;
 23 | 
 24 |         this.frontendStart = this.emscripten.Module.cwrap('frontend_start', null, []);
 25 |         this.frontendStatus = this.emscripten.Module.cwrap('frontend_status', 'number', []);
 26 |         this.frontendStop = this.emscripten.Module.cwrap('frontend_stop', null, []);
 27 | 
 28 |         this.frontendLoadGame = this.emscripten.Module.cwrap('frontend_load_game', 'number', [ 'number' ]);
 29 |         this.frontendUnloadGame = this.emscripten.Module.cwrap('frontend_unload_game', 'number', []);
 30 | 
 31 |         this.frontendGetState = this.emscripten.Module.cwrap('frontend_get_state', 'number', [ 'number', 'number' ]);
 32 |         this.frontendSetState = this.emscripten.Module.cwrap('frontend_set_state', 'number', [ 'number', 'number' ]);
 33 |         this.frontendResetState = this.emscripten.Module.cwrap('frontend_reset_state', 'number', []);
 34 | 
 35 |         this.emscripten.Module.callMain([]);
 36 | 
 37 |     };
 38 | 
 39 |     Engine.codeMap = { };
 40 | 
 41 |     // These values come from the libretro header
 42 | 
 43 |     Engine.codeMap.LEFT = 6;
 44 |     Engine.codeMap.RIGHT = 7;
 45 |     Engine.codeMap.UP = 4;
 46 |     Engine.codeMap.DOWN = 5;
 47 | 
 48 |     Engine.codeMap.A = 8;
 49 |     Engine.codeMap.B = 0;
 50 | 
 51 |     Engine.codeMap.L = 10;
 52 |     Engine.codeMap.R = 11;
 53 | 
 54 |     Engine.codeMap.SELECT = 2;
 55 |     Engine.codeMap.START = 3;
 56 | 
 57 |     Engine.prototype.loadArrayBuffer = function (arrayBuffer, options) {
 58 | 
 59 |         if (!this.stop())
 60 |             throw new Error('Cannot stop the engine to load a new game');
 61 | 
 62 |         if (typeof options === 'undefined')
 63 |             options = { };
 64 | 
 65 |         var autoStart = options.autoStart;
 66 |         var initialState = options.initialState;
 67 | 
 68 |         if (typeof autoStart === 'undefined')
 69 |             autoStart = true;
 70 | 
 71 |         if (this.lastCreatedFile) {
 72 |             this.frontendUnloadGame();
 73 |             this.emscripten.FS.unlink(this.lastCreatedFile);
 74 |         }
 75 | 
 76 |         this.lastCreatedFile = '/' + (options.fileName || this.defaultFileName);
 77 | 
 78 |         var stackPointer = this.emscripten.Runtime.stackSave();
 79 | 
 80 |         var gamePathPointer = this.emscripten.Module.allocate(this.emscripten.Module.intArrayFromString(this.lastCreatedFile), 'i8', this.emscripten.Module.ALLOC_STACK);
 81 |         this.emscripten.FS.writeFile(this.lastCreatedFile, new Uint8Array(arrayBuffer), { encoding : 'binary' });
 82 | 
 83 |         var result = this.frontendLoadGame(gamePathPointer);
 84 | 
 85 |         this.emscripten.Runtime.stackRestore(stackPointer);
 86 | 
 87 |         if (result < 0)
 88 |             throw new Error('Game load failed - the emulator returned ' + result);
 89 | 
 90 |         if (initialState)
 91 |             this.setState(initialState);
 92 | 
 93 |         if (autoStart) {
 94 |             this.start();
 95 |         }
 96 | 
 97 |     };
 98 | 
 99 |     Engine.prototype.resetState = function () {
100 | 
101 |         var result = this.frontendResetState();
102 | 
103 |         if (result < 0)
104 |             throw new Error('Cannot reset state at this time - the emulator returned ' + result);
105 | 
106 |         return this;
107 | 
108 |     };
109 | 
110 |     Engine.prototype.setState = function (arrayBuffer) {
111 | 
112 |         if (!arrayBuffer)
113 |             return this.resetState();
114 | 
115 |         var stackPointer = this.emscripten.Runtime.stackSave();
116 | 
117 |         var emdata = this.emscripten.Module.allocate(new Uint8Array(arrayBuffer), 'i8', this.emscripten.Module.ALLOC_STACK);
118 |         var result = this.frontendSetState(emdata, arrayBuffer.byteLength);
119 | 
120 |         this.emscripten.Runtime.stackRestore(stackPointer);
121 | 
122 |         if (result < 0)
123 |             throw new Error('Cannot set state at this time - the emulator returned ' + result);
124 | 
125 |         return this;
126 | 
127 |     };
128 | 
129 |     Engine.prototype.getState = function () {
130 | 
131 |         var stackPointer = this.emscripten.Runtime.stackSave();
132 | 
133 |         var emDataPtr = this.emscripten.Module.allocate([ 0 ], '*', this.emscripten.Module.ALLOC_STACK);
134 |         var emSizePtr = this.emscripten.Module.allocate([ 0 ], 'i32', this.emscripten.Module.ALLOC_STACK);
135 | 
136 |         var result = this.frontendGetState(emDataPtr, emSizePtr);
137 | 
138 |         var emdata = this.emscripten.Module.getValue(emDataPtr, '*');
139 |         var emsize = this.emscripten.Module.getValue(emSizePtr, 'i32');
140 | 
141 |         this.emscripten.Runtime.stackRestore(stackPointer);
142 | 
143 |         if (result < 0)
144 |             throw new Error('Cannot get state at this time - the emulator returned ' + result);
145 | 
146 |         return this.emscripten.Module.HEAPU8.buffer.slice(emdata, emdata + emsize);
147 | 
148 |     };
149 | 
150 |     Engine.prototype.start = function () {
151 | 
152 |         this.frontendStart();
153 | 
154 |         return this;
155 | 
156 |     };
157 | 
158 |     Engine.prototype.isRunning = function () {
159 | 
160 |         return Boolean(this.frontendStatus());
161 | 
162 |     };
163 | 
164 |     Engine.prototype.stop = function () {
165 | 
166 |         this.frontendStop();
167 | 
168 |         return this;
169 | 
170 |     };
171 | 
172 |     return Engine;
173 | 
174 | }));
175 | 


--------------------------------------------------------------------------------
/sources/frontend.c:
--------------------------------------------------------------------------------
  1 | #include <errno.h>
  2 | #include <stdio.h>
  3 | #include <stdlib.h>
  4 | #include <string.h>
  5 | 
  6 | #include <libretro.h>
  7 | 
  8 | #ifdef EMSCRIPTEN
  9 | # include <emscripten.h>
 10 | #endif
 11 | 
 12 | #include "./bridge_retro.h"
 13 | #include "./bridge_virtjs.h"
 14 | #include "./frontend.h"
 15 | 
 16 | #ifndef EMSCRIPTEN_KEEPALIVE
 17 | # define EMSCRIPTEN_KEEPALIVE
 18 | #endif
 19 | 
 20 | static int g_next_tick_id = 0;
 21 | 
 22 | static char const * g_state_path = NULL;
 23 | 
 24 | static void * g_state = NULL;
 25 | static size_t g_state_size = 0;
 26 | 
 27 | static int read_file(char const * path, void ** data, size_t * size)
 28 | {
 29 |     FILE * file = fopen(path, "rb");
 30 | 
 31 |     if (! file)
 32 |         return fprintf(stderr, "Cannot open file %s (%s)\n", path, strerror(errno)), fclose(file), -1;
 33 | 
 34 |     fseek(file, 0, SEEK_END);
 35 | 
 36 |     *size = ftell(file);
 37 |     *data = malloc(*size);
 38 | 
 39 |     fseek(file, 0, SEEK_SET);
 40 | 
 41 |     if (fread(*data, *size, 1, file) != 1)
 42 |         return fprintf(stderr, "Cannot read file %s (%s)\n", path, strerror(ferror(file))), fclose(file), -2;
 43 | 
 44 |     return fclose(file), 0;
 45 | }
 46 | 
 47 | static int write_file(char const * path, void const * data, size_t size)
 48 | {
 49 |     FILE * file = fopen(path, "wb+");
 50 | 
 51 |     if (! file)
 52 |         return fprintf(stderr, "Cannot open file %s (%s)\n", path, strerror(errno)), fclose(file), -1;
 53 | 
 54 |     if (fwrite(data, size, 1, file) != 1)
 55 |         return fprintf(stderr, "Cannot write file %s (%s)\n", path, strerror(ferror(file))), fclose(file), -2;
 56 | 
 57 |     return fclose(file), 0;
 58 | }
 59 | 
 60 | static void iterate(void)
 61 | {
 62 |     g_next_tick_id = bridge_virtjs_timer_next_tick(iterate);
 63 | 
 64 |     retro_run();
 65 |     bridge_virtjs_screen_flush_screen();
 66 | }
 67 | 
 68 | void EMSCRIPTEN_KEEPALIVE frontend_start(void)
 69 | {
 70 |     g_next_tick_id = bridge_virtjs_timer_next_tick(iterate);
 71 | }
 72 | 
 73 | bool EMSCRIPTEN_KEEPALIVE frontend_status(void)
 74 | {
 75 |     return g_next_tick_id != 0;
 76 | }
 77 | 
 78 | void EMSCRIPTEN_KEEPALIVE frontend_stop(void)
 79 | {
 80 |     bridge_virtjs_timer_cancel_tick(g_next_tick_id);
 81 |     g_next_tick_id = 0;
 82 | }
 83 | 
 84 | int EMSCRIPTEN_KEEPALIVE frontend_load_game(char const * path)
 85 | {
 86 |     struct retro_system_info system_info;
 87 |     retro_get_system_info(&system_info);
 88 | 
 89 |     void * data = NULL;
 90 |     size_t size = 0;
 91 | 
 92 |     if (! system_info.need_fullpath)
 93 |         if (read_file(path, &data, &size) < 0)
 94 |             return fprintf(stderr, "Cannot launch game %s\n", path), -1;
 95 | 
 96 |     struct retro_game_info game_info = { .path = path, .data = data, .size = size };
 97 | 
 98 |     if (!retro_load_game(&game_info))
 99 |         return fprintf(stderr, "Retroarch refused to launch game %s\n", path), -2;
100 | 
101 |     g_state_size = retro_serialize_size();
102 |     g_state = malloc(g_state_size);
103 | 
104 |     struct retro_system_av_info system_av_info;
105 |     retro_get_system_av_info(&system_av_info);
106 | 
107 |     if (bridge_virtjs_audio_validate_input_format(system_av_info.timing.sample_rate))
108 |         bridge_virtjs_audio_set_input_format(system_av_info.timing.sample_rate);
109 | 
110 |     return 0;
111 | }
112 | 
113 | int EMSCRIPTEN_KEEPALIVE frontend_unload_game(void)
114 | {
115 |     retro_unload_game();
116 | 
117 |     return 0;
118 | }
119 | 
120 | void EMSCRIPTEN_KEEPALIVE frontend_set_state_path(char const * path)
121 | {
122 |     g_state_path = path;
123 | }
124 | 
125 | int EMSCRIPTEN_KEEPALIVE frontend_load_state(void)
126 | {
127 |     if (!g_state_path)
128 |         return fprintf(stderr, "Cannot load state - no path specified\n"), -1;
129 | 
130 |     void * data = NULL;
131 |     size_t size = 0;
132 | 
133 |     if (read_file(g_state_path, &data, &size) < 0)
134 |         return free(data), -2;
135 | 
136 |     if (frontend_set_state(data, size) < 0)
137 |         return free(data), -3;
138 | 
139 |     return free(data), 0;
140 | }
141 | 
142 | int EMSCRIPTEN_KEEPALIVE frontend_save_state(void)
143 | {
144 |     if (!g_state_path)
145 |         return fprintf(stderr, "Cannot save state - no path specified\n"), -1;
146 | 
147 |     void const * data = NULL;
148 |     size_t size = 0;
149 | 
150 |     if (frontend_get_state(&data, &size) < 0)
151 |         return -2;
152 | 
153 |     if (write_file(g_state_path, data, size) < 0)
154 |         return -3;
155 | 
156 |     return 0;
157 | }
158 | 
159 | int EMSCRIPTEN_KEEPALIVE frontend_set_state(void const * state, size_t size)
160 | {
161 |     if (!retro_unserialize(state, size))
162 |         return -1;
163 | 
164 |     return 0;
165 | }
166 | 
167 | int EMSCRIPTEN_KEEPALIVE frontend_get_state(void const ** state, size_t * size)
168 | {
169 |     if (!retro_serialize(g_state, g_state_size))
170 |         return -1;
171 | 
172 |     *state = g_state;
173 |     *size = g_state_size;
174 | 
175 |     return 0;
176 | }
177 | 
178 | int EMSCRIPTEN_KEEPALIVE frontend_reset_state(void)
179 | {
180 |     retro_reset();
181 | 
182 |     return 0;
183 | }
184 | 


--------------------------------------------------------------------------------
/sources/frontend.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <stdbool.h>
 4 | #include <stddef.h>
 5 | 
 6 | #ifdef __cplusplus
 7 | extern "C" {
 8 | #endif
 9 | 
10 | void frontend_start(void);
11 | bool frontend_status(void);
12 | void frontend_stop(void);
13 | 
14 | int frontend_load_game(char const * path);
15 | int frontend_unload_game(void);
16 | 
17 | void frontend_set_state_path(char const * path);
18 | 
19 | int frontend_load_state(void);
20 | int frontend_save_state(void);
21 | 
22 | int frontend_set_state(void const * state, size_t size);
23 | int frontend_get_state(void const ** state, size_t * size);
24 | int frontend_reset_state(void);
25 | 
26 | #ifdef __cplusplus
27 | }
28 | #endif
29 | 


--------------------------------------------------------------------------------
/sources/input_formats.c:
--------------------------------------------------------------------------------
 1 | #include <stdlib.h>
 2 | 
 3 | #include <libretro.h>
 4 | 
 5 | #include "./input_formats.h"
 6 | 
 7 | struct input_format format_0rgb1555 = {
 8 |     .depth = 16,
 9 |     .r_mask = 0b0111110000000000,
10 |     .g_mask = 0b0000001111100000,
11 |     .b_mask = 0b0000000000011111,
12 |     .a_mask = 0b0000000000000000
13 | };
14 | 
15 | struct input_format format_rgb565 = {
16 |     .depth = 16,
17 |     .r_mask = 0b1111100000000000,
18 |     .g_mask = 0b0000011111100000,
19 |     .b_mask = 0b0000000000011111,
20 |     .a_mask = 0b0000000000000000
21 | };
22 | 
23 | struct input_format format_xrgb8888 = {
24 |     .depth = 32,
25 |     .r_mask = 0x00FF0000,
26 |     .g_mask = 0x0000FF00,
27 |     .b_mask = 0x000000FF,
28 |     .a_mask = 0x00000000
29 | };
30 | 
31 | struct input_format const * get_input_format(enum retro_pixel_format input_format)
32 | {
33 |     switch (input_format) {
34 |     case RETRO_PIXEL_FORMAT_0RGB1555 : return &format_0rgb1555;
35 |     case RETRO_PIXEL_FORMAT_XRGB8888 : return &format_xrgb8888;
36 |     case RETRO_PIXEL_FORMAT_RGB565 : return &format_rgb565;
37 |     default : return NULL;
38 |     }
39 | }
40 | 


--------------------------------------------------------------------------------
/sources/input_formats.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <stdlib.h>
 4 | 
 5 | #include <libretro.h>
 6 | 
 7 | struct input_format {
 8 | 
 9 |     unsigned depth;
10 | 
11 |     uint32_t r_mask;
12 |     uint32_t g_mask;
13 |     uint32_t b_mask;
14 |     uint32_t a_mask;
15 | 
16 | };
17 | 
18 | struct input_format const * get_input_format(enum retro_pixel_format pixel_format);
19 | 


--------------------------------------------------------------------------------
/sources/main.c:
--------------------------------------------------------------------------------
 1 | #include <stdio.h>
 2 | #include <unistd.h>
 3 | 
 4 | #include <libretro.h>
 5 | 
 6 | #include "./bridge_retro.h"
 7 | #include "./bridge_virtjs.h"
 8 | #include "./frontend.h"
 9 | 
10 | static void initialize(void)
11 | {
12 |     retro_set_environment(bridge_retro_environment);
13 |     retro_set_video_refresh(bridge_retro_video_refresh);
14 |     retro_set_input_poll(bridge_retro_input_poll);
15 |     retro_set_input_state(bridge_retro_input_state);
16 |     retro_set_audio_sample(bridge_retro_audio_sample);
17 |     retro_set_audio_sample_batch(bridge_retro_audio_sample_batch);
18 | 
19 |     retro_init();
20 | }
21 | 
22 | #if !defined(EMSCRIPTEN)
23 | 
24 | int main(int argc, char const ** argv)
25 | {
26 |     if (argc < 2)
27 |         return fprintf(stderr, "Usage: %s <rom> [<state>]\n", argv[0]);
28 | 
29 |     initialize();
30 | 
31 |     if (frontend_load_game(argv[1]) < 0)
32 |         return fprintf(stderr, "Game load failed\n"), -1;
33 | 
34 |     if (argc >= 3) {
35 |         frontend_set_state_path(argv[2]);
36 |         if (access(argv[2], F_OK) == 0 && frontend_load_state() < 0) {
37 |             return fprintf(stderr, "Initial state load failed\n"), -1;
38 |         }
39 |     }
40 | 
41 |     frontend_start();
42 |     bridge_virtjs_timer_start();
43 | 
44 |     return 0;
45 | }
46 | 
47 | #else
48 | 
49 | int main(void)
50 | {
51 |     initialize();
52 | 
53 |     return 0;
54 | }
55 | 
56 | #endif
57 | 


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/sources/prologue.js:
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 1 | (function (root, factory) {
 2 | 
 3 |     if (typeof define === 'function' && define.amd) {
 4 | 
 5 |         define([], factory);
 6 | 
 7 |     } else if (typeof exports === 'object') {
 8 | 
 9 |         module.exports = factory();
10 | 
11 |     } else {
12 | 
13 |         if (!root.Archjs)
14 |             root.Archjs = { byName: {} };
15 | 
16 |         root.Archjs.byName['@(ENGINE_NAME)'] = factory(root.$, root._);
17 | 
18 |     }
19 | 
20 | }(this, function () {
21 | 
22 |     var instanciateEmscripten = (function (Module) {
23 | 


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