├── emscripten.bash ├── README.md ├── javascript.html ├── shader.html ├── javascript.js ├── shader.js ├── emscripten.cpp ├── emscripten.html └── LICENSE /emscripten.bash: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | ~/emscripten/emsdk activate latest 4 | 5 | source ~/emscripten/emsdk_env.sh 6 | 7 | emcc -O2 --memory-init-file 0 -s WASM=0 --bind -s MODULARIZE=1 -s EXPORT_NAME="'Assembly'" -s EXTRA_EXPORTED_RUNTIME_METHODS="['cwrap', '_render', '_uniform1i', '_uniform1f', '_uniform3fv']" emscripten.cpp -o emscripten-asm.js 8 | emcc -O2 --memory-init-file 0 -s WASM=1 --bind -s MODULARIZE=1 -s EXPORT_NAME="'Webassembly'" -s EXTRA_EXPORTED_RUNTIME_METHODS="['cwrap', '_render', '_uniform1i', '_uniform1f', '_uniform3fv']" emscripten.cpp -o emscripten-wasm.js -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # wasm-raytracer 2 | While teaching a web development class, I wanted to present some benchmarks that show the performance benefits of asm.js as well as WebAssembly. I was unfortunately not able to find a suitable reference. Therefore, I implemented a simplistic raytracer in JavaScript as well as in C++ with a similar code structure while utilizing Emscripten to compile the C++ raytracer to asm.js as well as WebAssembly. For fun, I also translated the code to GLSL and am utilizing WebGL to leverage GPU computing. 3 | 4 |

Screenshot

5 | 6 | For a live demo, please see: https://sniklaus.com/wasmray 7 |
8 | For a discussion, see Reddit: https://www.reddit.com/r/programming/comments/7k4v5t/ 9 | 10 | ## benchmark 11 | Unsurprisingly, the version using GLSL / Shader is significantly faster than the others, showing that it is always important to use the right technology for the right purpose. However, this was not the point of this experiment. Instead, it shows how WebAssembly can potentially be used for an improved performance. To accelerate WebAssembly further, [threads](https://github.com/WebAssembly/threads) could be leveraged. Of course, one could make the argument that a different task could have shown the performance advantages of WebAssembly better. However, I also simply wanted to implement a raytracer. 12 | 13 | |Browser|JavaScript|asm.js|WebAssembly|GLSL / Shader| 14 | |---|---:|---:|---:|---:| 15 | |Firefox 57|~407.3 ms|~112.3 ms|~87.4 ms|~1.9 ms| 16 | |Firefox 58|~358.9 ms|~103.2 ms|~82.7 ms|~1.9 ms| 17 | |Chrome 62|~191.7 ms|~167.2 ms|~115.7 ms|~2.1 ms| 18 | |Chrome 63|~181.4 ms|~154.2 ms|~120.7 ms|~2.2 ms| 19 | 20 | Note that the JavaScript performance of Firefox 57 is significantly affected by a [bug](https://bugzilla.mozilla.org/show_bug.cgi?id=1425687) that has since been fixed. One might also wonder why asm.js in Chrome is slower than JavaScript, which is due to Chrome not having accelerated support for asm.js in the first place. 21 | 22 | ## license 23 | Please refer to the appropriate file within this repository. -------------------------------------------------------------------------------- /javascript.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 62 | 63 | 64 | 65 | 88 | 89 | 90 | -------------------------------------------------------------------------------- /shader.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 62 | 63 | 64 | 65 | 105 | 106 | 107 | -------------------------------------------------------------------------------- /javascript.js: -------------------------------------------------------------------------------- 1 | var Javascript = (function() { 2 | function dot(vecA, vecB) { 3 | return (vecA[0] * vecB[0]) + (vecA[1] * vecB[1]) + (vecA[2] * vecB[2]); 4 | } 5 | 6 | function length(vecA) { 7 | return Math.sqrt(dot(vecA, vecA)); 8 | } 9 | 10 | function normalize(vecA) { 11 | var fltLength = Math.max(0.00001, length(vecA)); 12 | 13 | vecA[0] /= fltLength; 14 | vecA[1] /= fltLength; 15 | vecA[2] /= fltLength; 16 | } 17 | 18 | function cross(vecA, vecB, vecC) { 19 | vecA[0] = (vecB[1] * vecC[2]) - (vecB[2] * vecC[1]); 20 | vecA[1] = (vecB[2] * vecC[0]) - (vecB[0] * vecC[2]); 21 | vecA[2] = (vecB[0] * vecC[1]) - (vecB[1] * vecC[0]); 22 | } 23 | 24 | function intersection(objIntersection, vecOrigin, vecDirection, fltMin, fltMax, boolPeek) { 25 | var fltIntersection = Infinity; 26 | 27 | normalize(vecDirection); 28 | 29 | for (var intPlane = 0; intPlane < objPlanes.length; intPlane += 1) { 30 | var vecDifference = [ 0.0, 0.0, 0.0 ]; 31 | 32 | vecDifference[0] = objPlanes[intPlane].vecLocation[0] - vecOrigin[0]; 33 | vecDifference[1] = objPlanes[intPlane].vecLocation[1] - vecOrigin[1]; 34 | vecDifference[2] = objPlanes[intPlane].vecLocation[2] - vecOrigin[2]; 35 | 36 | var fltDenominator = dot(vecDirection, objPlanes[intPlane].vecNormal); 37 | 38 | if (Math.abs(fltDenominator) < 0.01) { 39 | continue; 40 | } 41 | 42 | var fltDistance = dot(vecDifference, objPlanes[intPlane].vecNormal) / fltDenominator; 43 | 44 | if (fltDistance < fltMin) { 45 | continue; 46 | 47 | } else if (fltDistance > fltMax) { 48 | continue; 49 | 50 | } else if (fltDistance > fltIntersection) { 51 | continue; 52 | 53 | } 54 | 55 | if (boolPeek == true) { 56 | return fltDistance; 57 | } 58 | 59 | fltIntersection = fltDistance; 60 | 61 | objIntersection.fltDistance = fltDistance; 62 | 63 | objIntersection.vecLocation = [ 0.0, 0.0, 0.0 ]; 64 | objIntersection.vecLocation[0] = vecOrigin[0] + (fltDistance * vecDirection[0]); 65 | objIntersection.vecLocation[1] = vecOrigin[1] + (fltDistance * vecDirection[1]); 66 | objIntersection.vecLocation[2] = vecOrigin[2] + (fltDistance * vecDirection[2]); 67 | 68 | objIntersection.vecNormal = [ 0.0, 0.0, 0.0 ]; 69 | objIntersection.vecNormal[0] = objPlanes[intPlane].vecNormal[0]; 70 | objIntersection.vecNormal[1] = objPlanes[intPlane].vecNormal[1]; 71 | objIntersection.vecNormal[2] = objPlanes[intPlane].vecNormal[2]; 72 | 73 | objIntersection.vecColor = [ 0.0, 0.0, 0.0 ]; 74 | objIntersection.vecColor[0] = objPlanes[intPlane].vecColor[0]; 75 | objIntersection.vecColor[1] = objPlanes[intPlane].vecColor[1]; 76 | objIntersection.vecColor[2] = objPlanes[intPlane].vecColor[2]; 77 | 78 | objIntersection.fltSpecular = objPlanes[intPlane].fltSpecular; 79 | 80 | objIntersection.fltReflect = objPlanes[intPlane].fltReflect; 81 | 82 | var fltCheckerboard = Math.abs(Math.floor(objIntersection.vecLocation[0]) + Math.floor(objIntersection.vecLocation[2])) % 2.0; 83 | 84 | objIntersection.vecColor[0] *= 0.5 + (0.5 * fltCheckerboard); 85 | objIntersection.vecColor[1] *= 0.5 + (0.5 * fltCheckerboard); 86 | objIntersection.vecColor[2] *= 0.5 + (0.5 * fltCheckerboard); 87 | } 88 | 89 | for (var intSphere = 0; intSphere < objSpheres.length; intSphere += 1) { 90 | var vecDifference = [ 0.0, 0.0, 0.0 ]; 91 | 92 | vecDifference[0] = vecOrigin[0] - objSpheres[intSphere].vecLocation[0]; 93 | vecDifference[1] = vecOrigin[1] - objSpheres[intSphere].vecLocation[1]; 94 | vecDifference[2] = vecOrigin[2] - objSpheres[intSphere].vecLocation[2]; 95 | 96 | var fltAlpha = dot(vecDirection, vecDifference); 97 | var fltDiscriminant = (fltAlpha * fltAlpha) - dot(vecDifference, vecDifference) + (objSpheres[intSphere].fltRadius * objSpheres[intSphere].fltRadius); 98 | 99 | if (fltDiscriminant < 0.01) { 100 | continue; 101 | } 102 | 103 | var fltFirst = (-1.0 * fltAlpha) - Math.sqrt(fltDiscriminant); 104 | var fltSecond = (-1.0 * fltAlpha) + Math.sqrt(fltDiscriminant); 105 | var fltDistance = Infinity; 106 | 107 | if (fltFirst > fltMin) { 108 | if (fltFirst < fltMax) { 109 | fltDistance = Math.min(fltDistance, fltFirst); 110 | } 111 | } 112 | 113 | if (fltSecond > fltMin) { 114 | if (fltSecond < fltMax) { 115 | fltDistance = Math.min(fltDistance, fltSecond); 116 | } 117 | } 118 | 119 | if (fltDistance == Infinity) { 120 | continue; 121 | 122 | } else if (fltDistance > fltIntersection) { 123 | continue; 124 | 125 | } 126 | 127 | if (boolPeek == true) { 128 | return fltDistance; 129 | } 130 | 131 | fltIntersection = fltDistance; 132 | 133 | objIntersection.fltDistance = fltDistance; 134 | 135 | objIntersection.vecLocation = [ 0.0, 0.0, 0.0 ]; 136 | objIntersection.vecLocation[0] = vecOrigin[0] + (fltDistance * vecDirection[0]); 137 | objIntersection.vecLocation[1] = vecOrigin[1] + (fltDistance * vecDirection[1]); 138 | objIntersection.vecLocation[2] = vecOrigin[2] + (fltDistance * vecDirection[2]); 139 | 140 | objIntersection.vecNormal = [ 0.0, 0.0, 0.0 ]; 141 | objIntersection.vecNormal[0] = objIntersection.vecLocation[0] - objSpheres[intSphere].vecLocation[0]; 142 | objIntersection.vecNormal[1] = objIntersection.vecLocation[1] - objSpheres[intSphere].vecLocation[1]; 143 | objIntersection.vecNormal[2] = objIntersection.vecLocation[2] - objSpheres[intSphere].vecLocation[2]; 144 | 145 | objIntersection.vecColor = [ 0.0, 0.0, 0.0 ]; 146 | objIntersection.vecColor[0] = objSpheres[intSphere].vecColor[0]; 147 | objIntersection.vecColor[1] = objSpheres[intSphere].vecColor[1]; 148 | objIntersection.vecColor[2] = objSpheres[intSphere].vecColor[2]; 149 | 150 | objIntersection.fltSpecular = objSpheres[intSphere].fltSpecular; 151 | 152 | objIntersection.fltReflect = objSpheres[intSphere].fltReflect; 153 | } 154 | 155 | if (boolPeek != true) { 156 | if (fltIntersection < fltMax) { 157 | normalize(objIntersection.vecNormal); 158 | } 159 | } 160 | 161 | return fltIntersection; 162 | } 163 | 164 | function raytrace(vecColor, vecOrigin, vecDirection, fltMin, fltMax) { 165 | vecColor[0] = 0.0; 166 | vecColor[1] = 0.0; 167 | vecColor[2] = 0.0; 168 | 169 | var fltReflect = 1.0; 170 | 171 | for (var intRecurse = 0; intRecurse < 8; intRecurse += 1) { 172 | var objIntersection = {}; 173 | 174 | if (intersection(objIntersection, vecOrigin, vecDirection, fltMin, fltMax, false) > 10000.0) { 175 | return; 176 | } 177 | 178 | var fltAngle = Math.abs(dot(vecDirection, objIntersection.vecNormal)); 179 | 180 | var fltSchlick = (1.0 - objIntersection.fltReflect) + (objIntersection.fltReflect * Math.pow(1.0 - fltAngle, 5.0)); 181 | 182 | for (var intLight = 0; intLight < objLights.length; intLight += 1) { 183 | var vecLight = [ 0.0, 0.0, 0.0 ]; 184 | 185 | vecLight[0] = objLights[intLight].vecLocation[0] - objIntersection.vecLocation[0]; 186 | vecLight[1] = objLights[intLight].vecLocation[1] - objIntersection.vecLocation[1]; 187 | vecLight[2] = objLights[intLight].vecLocation[2] - objIntersection.vecLocation[2]; 188 | 189 | if (intersection(objIntersection, objIntersection.vecLocation, vecLight, 0.01, 10000.0, true) < 10000.0) { 190 | continue; 191 | } 192 | 193 | var fltDiffuse = dot(vecLight, objIntersection.vecNormal); 194 | 195 | var vecSpecular = [ 0.0, 0.0, 0.0 ]; 196 | 197 | vecSpecular[0] = vecLight[0] - (2.0 * fltDiffuse * objIntersection.vecNormal[0]); 198 | vecSpecular[1] = vecLight[1] - (2.0 * fltDiffuse * objIntersection.vecNormal[1]); 199 | vecSpecular[2] = vecLight[2] - (2.0 * fltDiffuse * objIntersection.vecNormal[2]); 200 | 201 | var fltSpecular = Math.max(0.01, Math.pow(dot(vecDirection, vecSpecular), objIntersection.fltSpecular)); 202 | 203 | vecColor[0] += fltReflect * fltSchlick * (fltDiffuse + fltSpecular) * objIntersection.vecColor[0] * objLights[intLight].vecIntensity[0]; 204 | vecColor[1] += fltReflect * fltSchlick * (fltDiffuse + fltSpecular) * objIntersection.vecColor[1] * objLights[intLight].vecIntensity[1]; 205 | vecColor[2] += fltReflect * fltSchlick * (fltDiffuse + fltSpecular) * objIntersection.vecColor[2] * objLights[intLight].vecIntensity[2]; 206 | } 207 | 208 | vecColor[0] += fltReflect * fltSchlick * objIntersection.vecColor[0] * vecAmbient[0]; 209 | vecColor[1] += fltReflect * fltSchlick * objIntersection.vecColor[1] * vecAmbient[1]; 210 | vecColor[2] += fltReflect * fltSchlick * objIntersection.vecColor[2] * vecAmbient[2]; 211 | 212 | fltReflect *= 1.0 - fltSchlick; 213 | 214 | if (fltReflect < 0.01) { 215 | break; 216 | } 217 | 218 | var fltReflection = dot(vecDirection, objIntersection.vecNormal); 219 | 220 | vecOrigin[0] = objIntersection.vecLocation[0]; 221 | vecOrigin[1] = objIntersection.vecLocation[1]; 222 | vecOrigin[2] = objIntersection.vecLocation[2]; 223 | 224 | vecDirection[0] = vecDirection[0] - (2.0 * fltReflection * objIntersection.vecNormal[0]); 225 | vecDirection[1] = vecDirection[1] - (2.0 * fltReflection * objIntersection.vecNormal[1]); 226 | vecDirection[2] = vecDirection[2] - (2.0 * fltReflection * objIntersection.vecNormal[2]); 227 | 228 | fltMin = 0.01; 229 | 230 | fltMax = 10000.0; 231 | } 232 | } 233 | 234 | function render(charPixels) { 235 | for (var intY = 0; intY < intHeight; intY += 1) { 236 | for (var intX = 0; intX < intWidth; intX += 1) { 237 | var fltX = (intX / intWidth) - 0.5; 238 | var fltY = 0.5 - (intY / intHeight); 239 | 240 | var vecColor = [ 0.0, 0.0, 0.0 ]; 241 | var vecOrigin = [ 6.0 * Math.cos(fltTime), 5.0, 6.0 * Math.sin(fltTime) ]; 242 | var vecDirection = [ 0.0 - vecOrigin[0], 1.0 - vecOrigin[1], 0.0 - vecOrigin[2] ]; 243 | 244 | normalize(vecDirection); 245 | 246 | var vecRight = [ 0.0, 0.0, 0.0 ]; 247 | var vecUp = [ 0.0, 1.0, 0.0 ]; 248 | 249 | cross(vecRight, vecDirection, vecUp); 250 | cross(vecUp, vecRight, vecDirection); 251 | 252 | vecDirection[0] += (fltX * vecRight[0]) + (fltY * vecUp[0]); 253 | vecDirection[1] += (fltX * vecRight[1]) + (fltY * vecUp[1]); 254 | vecDirection[2] += (fltX * vecRight[2]) + (fltY * vecUp[2]); 255 | 256 | raytrace(vecColor, vecOrigin, vecDirection, 1.0, 10000.0); 257 | 258 | charPixels[(intY * intWidth * 4) + (intX * 4) + 0] = Math.min(255.0, 255.0 * vecColor[0]); 259 | charPixels[(intY * intWidth * 4) + (intX * 4) + 1] = Math.min(255.0, 255.0 * vecColor[1]); 260 | charPixels[(intY * intWidth * 4) + (intX * 4) + 2] = Math.min(255.0, 255.0 * vecColor[2]); 261 | charPixels[(intY * intWidth * 4) + (intX * 4) + 3] = 255; 262 | } 263 | } 264 | } 265 | 266 | return { 267 | 'render': render 268 | } 269 | })(); 270 | -------------------------------------------------------------------------------- /shader.js: -------------------------------------------------------------------------------- 1 | var Shader = (function() { 2 | var strVertex = ` 3 | attribute vec2 vecPosition; 4 | 5 | void main() { 6 | gl_Position = vec4(vecPosition, 0.0, 1.0); 7 | } 8 | `; 9 | 10 | var strFragment = ` 11 | precision highp float; 12 | 13 | #define Infinity 100000000000.0 14 | 15 | struct Plane { 16 | vec3 vecLocation; 17 | vec3 vecNormal; 18 | vec3 vecColor; 19 | float fltSpecular; 20 | float fltReflect; 21 | }; 22 | 23 | struct Sphere { 24 | vec3 vecLocation; 25 | float fltRadius; 26 | vec3 vecColor; 27 | float fltSpecular; 28 | float fltReflect; 29 | }; 30 | 31 | struct Light { 32 | vec3 vecLocation; 33 | vec3 vecIntensity; 34 | }; 35 | 36 | struct Intersection { 37 | float fltDistance; 38 | vec3 vecLocation; 39 | vec3 vecNormal; 40 | vec3 vecColor; 41 | float fltSpecular; 42 | float fltReflect; 43 | }; 44 | 45 | uniform int intWidth; 46 | uniform int intHeight; 47 | 48 | uniform int objPlanes_length; 49 | uniform Plane objPlanes[16]; 50 | 51 | uniform int objSpheres_length; 52 | uniform Sphere objSpheres[16]; 53 | 54 | uniform int objLights_length; 55 | uniform Light objLights[16]; 56 | 57 | uniform vec3 vecAmbient; 58 | 59 | uniform float fltTime; 60 | 61 | float intersection(inout Intersection objIntersection, inout vec3 vecOrigin, inout vec3 vecDirection, float fltMin, float fltMax, bool boolPeek) { 62 | float fltIntersection = Infinity; 63 | 64 | vecDirection = normalize(vecDirection); 65 | 66 | for (int intPlane = 0; intPlane < 16; intPlane += 1) { 67 | if (intPlane == objPlanes_length) { 68 | break; 69 | } 70 | 71 | vec3 vecDifference = objPlanes[intPlane].vecLocation - vecOrigin; 72 | 73 | float fltDenominator = dot(vecDirection, objPlanes[intPlane].vecNormal); 74 | 75 | if (abs(fltDenominator) < 0.01) { 76 | continue; 77 | } 78 | 79 | float fltDistance = dot(vecDifference, objPlanes[intPlane].vecNormal) / fltDenominator; 80 | 81 | if (fltDistance < fltMin) { 82 | continue; 83 | 84 | } else if (fltDistance > fltMax) { 85 | continue; 86 | 87 | } else if (fltDistance > fltIntersection) { 88 | continue; 89 | 90 | } 91 | 92 | if (boolPeek == true) { 93 | return fltDistance; 94 | } 95 | 96 | fltIntersection = fltDistance; 97 | 98 | objIntersection.fltDistance = fltDistance; 99 | objIntersection.vecLocation = vecOrigin + (fltDistance * vecDirection); 100 | objIntersection.vecNormal = objPlanes[intPlane].vecNormal; 101 | objIntersection.vecColor = objPlanes[intPlane].vecColor; 102 | objIntersection.fltSpecular = objPlanes[intPlane].fltSpecular; 103 | objIntersection.fltReflect = objPlanes[intPlane].fltReflect; 104 | 105 | float fltCheckerboard = mod(abs(floor(objIntersection.vecLocation.x) + floor(objIntersection.vecLocation.z)), 2.0); 106 | 107 | objIntersection.vecColor *= 0.5 + (0.5 * fltCheckerboard); 108 | } 109 | 110 | for (int intSphere = 0; intSphere < 16; intSphere += 1) { 111 | if (intSphere == objSpheres_length) { 112 | break; 113 | } 114 | 115 | vec3 vecDifference = vecOrigin - objSpheres[intSphere].vecLocation; 116 | 117 | float fltAlpha = dot(vecDirection, vecDifference); 118 | float fltDiscriminant = (fltAlpha * fltAlpha) - dot(vecDifference, vecDifference) + (objSpheres[intSphere].fltRadius * objSpheres[intSphere].fltRadius); 119 | 120 | if (fltDiscriminant < 0.01) { 121 | continue; 122 | } 123 | 124 | float fltFirst = (-1.0 * fltAlpha) - sqrt(fltDiscriminant); 125 | float fltSecond = (-1.0 * fltAlpha) + sqrt(fltDiscriminant); 126 | float fltDistance = Infinity; 127 | 128 | if (fltFirst > fltMin) { 129 | if (fltFirst < fltMax) { 130 | fltDistance = min(fltDistance, fltFirst); 131 | } 132 | } 133 | 134 | if (fltSecond > fltMin) { 135 | if (fltSecond < fltMax) { 136 | fltDistance = min(fltDistance, fltSecond); 137 | } 138 | } 139 | 140 | if (fltDistance == Infinity) { 141 | continue; 142 | 143 | } else if (fltDistance > fltIntersection) { 144 | continue; 145 | 146 | } 147 | 148 | if (boolPeek == true) { 149 | return fltDistance; 150 | } 151 | 152 | fltIntersection = fltDistance; 153 | 154 | objIntersection.fltDistance = fltDistance; 155 | objIntersection.vecLocation = vecOrigin + (fltDistance * vecDirection); 156 | objIntersection.vecNormal = objIntersection.vecLocation - objSpheres[intSphere].vecLocation; 157 | objIntersection.vecColor = objSpheres[intSphere].vecColor; 158 | objIntersection.fltSpecular = objSpheres[intSphere].fltSpecular; 159 | objIntersection.fltReflect = objSpheres[intSphere].fltReflect; 160 | } 161 | 162 | if (boolPeek != true) { 163 | if (fltIntersection < fltMax) { 164 | objIntersection.vecNormal = normalize(objIntersection.vecNormal); 165 | } 166 | } 167 | 168 | return fltIntersection; 169 | } 170 | 171 | void raytrace(inout vec3 vecColor, vec3 vecOrigin, vec3 vecDirection, float fltMin, float fltMax) { 172 | vecColor = vec3(0.0, 0.0, 0.0); 173 | 174 | float fltReflect = 1.0; 175 | 176 | for (int intRecurse = 0; intRecurse < 8; intRecurse += 1) { 177 | Intersection objIntersection = Intersection(0.0, vec3(0.0, 0.0, 0.0), vec3(0.0, 0.0, 0.0), vec3(0.0, 0.0, 0.0), 0.0, 0.0); 178 | 179 | if (intersection(objIntersection, vecOrigin, vecDirection, fltMin, fltMax, false) > 10000.0) { 180 | break; 181 | } 182 | 183 | float fltAngle = abs(dot(vecDirection, objIntersection.vecNormal)); 184 | 185 | float fltSchlick = (1.0 - objIntersection.fltReflect) + (objIntersection.fltReflect * pow(1.0 - fltAngle, 5.0)); 186 | 187 | for (int intLight = 0; intLight < 16; intLight += 1) { 188 | if (intLight == objLights_length) { 189 | break; 190 | } 191 | 192 | vec3 vecLight = objLights[intLight].vecLocation - objIntersection.vecLocation; 193 | 194 | if (intersection(objIntersection, objIntersection.vecLocation, vecLight, 0.01, 10000.0, true) < 10000.0) { 195 | continue; 196 | } 197 | 198 | float fltDiffuse = dot(vecLight, objIntersection.vecNormal); 199 | 200 | vec3 vecSpecular = vecLight - (2.0 * fltDiffuse * objIntersection.vecNormal); 201 | 202 | float fltSpecular = max(0.01, pow(dot(vecDirection, vecSpecular), objIntersection.fltSpecular)); 203 | 204 | vecColor += fltReflect * fltSchlick * (fltDiffuse + fltSpecular) * objIntersection.vecColor * objLights[intLight].vecIntensity; 205 | } 206 | 207 | vecColor += fltReflect * fltSchlick * objIntersection.vecColor * vecAmbient; 208 | 209 | fltReflect *= 1.0 - fltSchlick; 210 | 211 | if (fltReflect < 0.01) { 212 | break; 213 | } 214 | 215 | vecOrigin = objIntersection.vecLocation; 216 | vecDirection = vecDirection - (2.0 * dot(vecDirection, objIntersection.vecNormal) * objIntersection.vecNormal); 217 | fltMin = 0.01; 218 | fltMax = 10000.0; 219 | } 220 | } 221 | 222 | void main() { 223 | float fltX = (gl_FragCoord.x / float(intWidth)) - 0.5; 224 | float fltY = (gl_FragCoord.y / float(intHeight)) - 0.5; 225 | 226 | vec3 vecColor = vec3(0.0, 0.0, 0.0); 227 | vec3 vecOrigin = vec3(6.0 * cos(fltTime), 5.0, 6.0 * sin(fltTime)); 228 | vec3 vecDirection = vec3(0.0, 1.0, 0.0) - vecOrigin; 229 | 230 | vecDirection = normalize(vecDirection); 231 | 232 | vec3 vecRight = vec3(0.0, 0.0, 0.0); 233 | vec3 vecUp = vec3(0.0, 1.0, 0.0); 234 | 235 | vecRight = cross(vecDirection, vecUp); 236 | vecUp = cross(vecRight, vecDirection); 237 | 238 | vecDirection += (fltX * vecRight) + (fltY * vecUp); 239 | 240 | raytrace(vecColor, vecOrigin, vecDirection, 1.0, 10000.0); 241 | 242 | gl_FragColor = vec4(vecColor, 1.0); 243 | } 244 | `; 245 | 246 | var objProgram = null; 247 | 248 | function init(objContext) { 249 | objProgram = objContext.createProgram(); 250 | 251 | var objVertexshader = objContext.createShader(objContext.VERTEX_SHADER); 252 | objContext.shaderSource(objVertexshader, strVertex); 253 | objContext.compileShader(objVertexshader); 254 | objContext.attachShader(objProgram, objVertexshader); 255 | if (objContext.getShaderInfoLog(objVertexshader).length > 0) { 256 | throw objContext.getShaderInfoLog(objVertexshader); 257 | } 258 | 259 | var objFragmentshader = objContext.createShader(objContext.FRAGMENT_SHADER); 260 | objContext.shaderSource(objFragmentshader, strFragment); 261 | objContext.compileShader(objFragmentshader); 262 | objContext.attachShader(objProgram, objFragmentshader); 263 | if (objContext.getShaderInfoLog(objFragmentshader).length > 0) { 264 | throw objContext.getShaderInfoLog(objFragmentshader); 265 | } 266 | 267 | objContext.linkProgram(objProgram); 268 | objContext.useProgram(objProgram); 269 | 270 | objContext.enableVertexAttribArray(objContext.getAttribLocation(objProgram, 'vecPosition')); 271 | objContext.bindBuffer(objContext.ARRAY_BUFFER, objContext.createBuffer()); 272 | objContext.bufferData(objContext.ARRAY_BUFFER, new Float32Array([ -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0 ]), objContext.STATIC_DRAW); 273 | objContext.vertexAttribPointer(objContext.getAttribLocation(objProgram, 'vecPosition'), 2, objContext.FLOAT, false, 0, 0); 274 | 275 | objContext.uniform1i(objContext.getUniformLocation(objProgram, 'intWidth'), intWidth); 276 | objContext.uniform1i(objContext.getUniformLocation(objProgram, 'intHeight'), intHeight); 277 | 278 | objContext.uniform1i(objContext.getUniformLocation(objProgram, 'objPlanes_length'), objPlanes.length); 279 | for (var intPlane = 0; intPlane < objPlanes.length; intPlane += 1) { 280 | objContext.uniform3fv(objContext.getUniformLocation(objProgram, 'objPlanes[' + intPlane + '].vecLocation'), objPlanes[intPlane].vecLocation); 281 | objContext.uniform3fv(objContext.getUniformLocation(objProgram, 'objPlanes[' + intPlane + '].vecNormal'), objPlanes[intPlane].vecNormal); 282 | objContext.uniform3fv(objContext.getUniformLocation(objProgram, 'objPlanes[' + intPlane + '].vecColor'), objPlanes[intPlane].vecColor); 283 | objContext.uniform1f(objContext.getUniformLocation(objProgram, 'objPlanes[' + intPlane + '].fltSpecular'), objPlanes[intPlane].fltSpecular); 284 | objContext.uniform1f(objContext.getUniformLocation(objProgram, 'objPlanes[' + intPlane + '].fltReflect'), objPlanes[intPlane].fltReflect); 285 | } 286 | 287 | objContext.uniform1i(objContext.getUniformLocation(objProgram, 'objSpheres_length'), objSpheres.length); 288 | for (var intSphere = 0; intSphere < objSpheres.length; intSphere += 1) { 289 | objContext.uniform3fv(objContext.getUniformLocation(objProgram, 'objSpheres[' + intSphere + '].vecLocation'), objSpheres[intSphere].vecLocation); 290 | objContext.uniform1f(objContext.getUniformLocation(objProgram, 'objSpheres[' + intSphere + '].fltRadius'), objSpheres[intSphere].fltRadius); 291 | objContext.uniform3fv(objContext.getUniformLocation(objProgram, 'objSpheres[' + intSphere + '].vecColor'), objSpheres[intSphere].vecColor); 292 | objContext.uniform1f(objContext.getUniformLocation(objProgram, 'objSpheres[' + intSphere + '].fltSpecular'), objSpheres[intSphere].fltSpecular); 293 | objContext.uniform1f(objContext.getUniformLocation(objProgram, 'objSpheres[' + intSphere + '].fltReflect'), objSpheres[intSphere].fltReflect); 294 | } 295 | 296 | objContext.uniform1i(objContext.getUniformLocation(objProgram, 'objLights_length'), objLights.length); 297 | for (var intLight = 0; intLight < objLights.length; intLight += 1) { 298 | objContext.uniform3fv(objContext.getUniformLocation(objProgram, 'objLights[' + intLight + '].vecLocation'), objLights[intLight].vecLocation); 299 | objContext.uniform3fv(objContext.getUniformLocation(objProgram, 'objLights[' + intLight + '].vecIntensity'), objLights[intLight].vecIntensity); 300 | } 301 | 302 | objContext.uniform3fv(objContext.getUniformLocation(objProgram, 'vecAmbient'), vecAmbient); 303 | } 304 | 305 | function render(objContext) { 306 | if (objProgram === null) { 307 | init(objContext); 308 | } 309 | 310 | objContext.uniform1f(objContext.getUniformLocation(objProgram, 'fltTime'), fltTime); 311 | 312 | objContext.clearColor(0.0, 0.0, 0.0, 1.0); 313 | objContext.clear(objContext.COLOR_BUFFER_BIT); 314 | objContext.drawArrays(objContext.TRIANGLES, 0, 6); 315 | } 316 | 317 | return { 318 | 'render': render 319 | } 320 | })(); 321 | -------------------------------------------------------------------------------- /emscripten.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | 13 | #define minimum(intA, intB) (intA < intB) ? (intA) : (intB) 14 | #define maximum(intA, intB) (intA > intB) ? (intA) : (intB) 15 | 16 | static inline unsigned long long milliseconds() { 17 | timespec objTimespec = { }; 18 | 19 | clock_gettime(CLOCK_MONOTONIC, &objTimespec); 20 | 21 | return (objTimespec.tv_sec * 1000) + (objTimespec.tv_nsec / 1000000); 22 | } 23 | 24 | static inline unsigned long long microseconds() { 25 | timespec objTimespec = { }; 26 | 27 | clock_gettime(CLOCK_MONOTONIC, &objTimespec); 28 | 29 | return (objTimespec.tv_sec * 1000000) + (objTimespec.tv_nsec / 1000); 30 | } 31 | 32 | #include "emscripten.h" 33 | 34 | // ---------------------------------------------------------- 35 | 36 | #define Infinity 100000000000.0 37 | 38 | struct Plane { 39 | float vecLocation[3]; 40 | float vecNormal[3]; 41 | float vecColor[3]; 42 | float fltSpecular; 43 | float fltReflect; 44 | }; 45 | 46 | struct Sphere { 47 | float vecLocation[3]; 48 | float fltRadius; 49 | float vecColor[3]; 50 | float fltSpecular; 51 | float fltReflect; 52 | }; 53 | 54 | struct Light { 55 | float vecLocation[3]; 56 | float vecIntensity[3]; 57 | }; 58 | 59 | struct Intersection { 60 | float fltDistance; 61 | float vecLocation[3]; 62 | float vecNormal[3]; 63 | float vecColor[3]; 64 | float fltSpecular; 65 | float fltReflect; 66 | }; 67 | 68 | int intWidth = 0; 69 | int intHeight = 0; 70 | 71 | int objPlanes_length = 0; 72 | Plane objPlanes[16] = {}; 73 | 74 | int objSpheres_length = 0; 75 | Sphere objSpheres[16] = {}; 76 | 77 | int objLights_length = 0; 78 | Light objLights[16] = {}; 79 | 80 | float vecAmbient[3] = { 0.0, 0.0, 0.0 }; 81 | 82 | float fltTime = 0.0; 83 | 84 | static inline float dot(float vecA[3], float vecB[3]) { 85 | return (vecA[0] * vecB[0]) + (vecA[1] * vecB[1]) + (vecA[2] * vecB[2]); 86 | } 87 | 88 | static inline float length(float vecA[3]) { 89 | return sqrt(dot(vecA, vecA)); 90 | } 91 | 92 | static inline void normalize(float vecA[3]) { 93 | float fltLength = fmax(0.00001, length(vecA)); 94 | 95 | vecA[0] /= fltLength; 96 | vecA[1] /= fltLength; 97 | vecA[2] /= fltLength; 98 | } 99 | 100 | static inline void cross(float vecA[3], float vecB[3], float vecC[3]) { 101 | vecA[0] = (vecB[1] * vecC[2]) - (vecB[2] * vecC[1]); 102 | vecA[1] = (vecB[2] * vecC[0]) - (vecB[0] * vecC[2]); 103 | vecA[2] = (vecB[0] * vecC[1]) - (vecB[1] * vecC[0]); 104 | } 105 | 106 | static inline float intersection(Intersection* objIntersection, float* vecOrigin, float* vecDirection, float fltMin, float fltMax, bool boolPeek) { 107 | float fltIntersection = Infinity; 108 | 109 | normalize(vecDirection); 110 | 111 | for (int intPlane = 0; intPlane < objPlanes_length; intPlane += 1) { 112 | float vecDifference[3] = { 0.0, 0.0, 0.0 }; 113 | 114 | vecDifference[0] = objPlanes[intPlane].vecLocation[0] - vecOrigin[0]; 115 | vecDifference[1] = objPlanes[intPlane].vecLocation[1] - vecOrigin[1]; 116 | vecDifference[2] = objPlanes[intPlane].vecLocation[2] - vecOrigin[2]; 117 | 118 | float fltDenominator = dot(vecDirection, objPlanes[intPlane].vecNormal); 119 | 120 | if (fabs(fltDenominator) < 0.01) { 121 | continue; 122 | } 123 | 124 | float fltDistance = dot(vecDifference, objPlanes[intPlane].vecNormal) / fltDenominator; 125 | 126 | if (fltDistance < fltMin) { 127 | continue; 128 | 129 | } else if (fltDistance > fltMax) { 130 | continue; 131 | 132 | } else if (fltDistance > fltIntersection) { 133 | continue; 134 | 135 | } 136 | 137 | if (boolPeek == true) { 138 | return fltDistance; 139 | } 140 | 141 | fltIntersection = fltDistance; 142 | 143 | objIntersection->fltDistance = fltDistance; 144 | 145 | objIntersection->vecLocation[0] = vecOrigin[0] + (fltDistance * vecDirection[0]); 146 | objIntersection->vecLocation[1] = vecOrigin[1] + (fltDistance * vecDirection[1]); 147 | objIntersection->vecLocation[2] = vecOrigin[2] + (fltDistance * vecDirection[2]); 148 | 149 | objIntersection->vecNormal[0] = objPlanes[intPlane].vecNormal[0]; 150 | objIntersection->vecNormal[1] = objPlanes[intPlane].vecNormal[1]; 151 | objIntersection->vecNormal[2] = objPlanes[intPlane].vecNormal[2]; 152 | 153 | objIntersection->vecColor[0] = objPlanes[intPlane].vecColor[0]; 154 | objIntersection->vecColor[1] = objPlanes[intPlane].vecColor[1]; 155 | objIntersection->vecColor[2] = objPlanes[intPlane].vecColor[2]; 156 | 157 | objIntersection->fltSpecular = objPlanes[intPlane].fltSpecular; 158 | 159 | objIntersection->fltReflect = objPlanes[intPlane].fltReflect; 160 | 161 | float fltCheckerboard = fmod(fabs(floor(objIntersection->vecLocation[0]) + floor(objIntersection->vecLocation[2])), 2.0); 162 | 163 | objIntersection->vecColor[0] *= 0.5 + (0.5 * fltCheckerboard); 164 | objIntersection->vecColor[1] *= 0.5 + (0.5 * fltCheckerboard); 165 | objIntersection->vecColor[2] *= 0.5 + (0.5 * fltCheckerboard); 166 | } 167 | 168 | for (int intSphere = 0; intSphere < objSpheres_length; intSphere += 1) { 169 | float vecDifference[3] = { 0.0, 0.0, 0.0 }; 170 | 171 | vecDifference[0] = vecOrigin[0] - objSpheres[intSphere].vecLocation[0]; 172 | vecDifference[1] = vecOrigin[1] - objSpheres[intSphere].vecLocation[1]; 173 | vecDifference[2] = vecOrigin[2] - objSpheres[intSphere].vecLocation[2]; 174 | 175 | float fltAlpha = dot(vecDirection, vecDifference); 176 | float fltDiscriminant = (fltAlpha * fltAlpha) - dot(vecDifference, vecDifference) + (objSpheres[intSphere].fltRadius * objSpheres[intSphere].fltRadius); 177 | 178 | if (fltDiscriminant < 0.01) { 179 | continue; 180 | } 181 | 182 | float fltFirst = (-1.0 * fltAlpha) - sqrt(fltDiscriminant); 183 | float fltSecond = (-1.0 * fltAlpha) + sqrt(fltDiscriminant); 184 | float fltDistance = Infinity; 185 | 186 | if (fltFirst > fltMin) { 187 | if (fltFirst < fltMax) { 188 | fltDistance = fmin(fltDistance, fltFirst); 189 | } 190 | } 191 | 192 | if (fltSecond > fltMin) { 193 | if (fltSecond < fltMax) { 194 | fltDistance = fmin(fltDistance, fltSecond); 195 | } 196 | } 197 | 198 | if (fltIntersection < fltDistance) { 199 | continue; 200 | } 201 | 202 | if (fltDistance == Infinity) { 203 | continue; 204 | 205 | } else if (fltDistance > fltIntersection) { 206 | continue; 207 | 208 | } 209 | 210 | if (boolPeek == true) { 211 | return fltDistance; 212 | } 213 | 214 | fltIntersection = fltDistance; 215 | 216 | objIntersection->fltDistance = fltDistance; 217 | 218 | objIntersection->vecLocation[0] = vecOrigin[0] + (fltDistance * vecDirection[0]); 219 | objIntersection->vecLocation[1] = vecOrigin[1] + (fltDistance * vecDirection[1]); 220 | objIntersection->vecLocation[2] = vecOrigin[2] + (fltDistance * vecDirection[2]); 221 | 222 | objIntersection->vecNormal[0] = objIntersection->vecLocation[0] - objSpheres[intSphere].vecLocation[0]; 223 | objIntersection->vecNormal[1] = objIntersection->vecLocation[1] - objSpheres[intSphere].vecLocation[1]; 224 | objIntersection->vecNormal[2] = objIntersection->vecLocation[2] - objSpheres[intSphere].vecLocation[2]; 225 | 226 | objIntersection->vecColor[0] = objSpheres[intSphere].vecColor[0]; 227 | objIntersection->vecColor[1] = objSpheres[intSphere].vecColor[1]; 228 | objIntersection->vecColor[2] = objSpheres[intSphere].vecColor[2]; 229 | 230 | objIntersection->fltSpecular = objSpheres[intSphere].fltSpecular; 231 | 232 | objIntersection->fltReflect = objSpheres[intSphere].fltReflect; 233 | } 234 | 235 | if (boolPeek != true) { 236 | if (fltIntersection < fltMax) { 237 | normalize(objIntersection->vecNormal); 238 | } 239 | } 240 | 241 | return fltIntersection; 242 | } 243 | 244 | void raytrace(float* vecColor, float* vecOrigin, float* vecDirection, float fltMin, float fltMax) { 245 | vecColor[0] = 0.0; 246 | vecColor[1] = 0.0; 247 | vecColor[2] = 0.0; 248 | 249 | float fltReflect = 1.0; 250 | 251 | for (int intRecurse = 0; intRecurse < 8; intRecurse += 1) { 252 | Intersection objIntersection = {}; 253 | 254 | if (intersection(&objIntersection, vecOrigin, vecDirection, fltMin, fltMax, false) > 10000.0) { 255 | return; 256 | } 257 | 258 | float fltAngle = fabs(dot(vecDirection, objIntersection.vecNormal)); 259 | 260 | float fltSchlick = (1.0 - objIntersection.fltReflect) + (objIntersection.fltReflect * pow(1.0 - fltAngle, 5.0)); 261 | 262 | for (int intLight = 0; intLight < objLights_length; intLight += 1) { 263 | float vecLight[3] = { 0.0, 0.0, 0.0 }; 264 | 265 | vecLight[0] = objLights[intLight].vecLocation[0] - objIntersection.vecLocation[0]; 266 | vecLight[1] = objLights[intLight].vecLocation[1] - objIntersection.vecLocation[1]; 267 | vecLight[2] = objLights[intLight].vecLocation[2] - objIntersection.vecLocation[2]; 268 | 269 | if (intersection(&objIntersection, objIntersection.vecLocation, vecLight, 0.01, 10000.0, true) < 10000.0) { 270 | continue; 271 | } 272 | 273 | float fltDiffuse = dot(vecLight, objIntersection.vecNormal); 274 | 275 | float vecSpecular[3] = { 0.0, 0.0, 0.0 }; 276 | 277 | vecSpecular[0] = vecLight[0] - (2.0 * fltDiffuse * objIntersection.vecNormal[0]); 278 | vecSpecular[1] = vecLight[1] - (2.0 * fltDiffuse * objIntersection.vecNormal[1]); 279 | vecSpecular[2] = vecLight[2] - (2.0 * fltDiffuse * objIntersection.vecNormal[2]); 280 | 281 | float fltSpecular = fmax(0.01, pow(dot(vecDirection, vecSpecular), objIntersection.fltSpecular)); 282 | 283 | vecColor[0] += fltReflect * fltSchlick * (fltDiffuse + fltSpecular) * objIntersection.vecColor[0] * objLights[intLight].vecIntensity[0]; 284 | vecColor[1] += fltReflect * fltSchlick * (fltDiffuse + fltSpecular) * objIntersection.vecColor[1] * objLights[intLight].vecIntensity[1]; 285 | vecColor[2] += fltReflect * fltSchlick * (fltDiffuse + fltSpecular) * objIntersection.vecColor[2] * objLights[intLight].vecIntensity[2]; 286 | } 287 | 288 | vecColor[0] += fltReflect * fltSchlick * objIntersection.vecColor[0] * vecAmbient[0]; 289 | vecColor[1] += fltReflect * fltSchlick * objIntersection.vecColor[1] * vecAmbient[1]; 290 | vecColor[2] += fltReflect * fltSchlick * objIntersection.vecColor[2] * vecAmbient[2]; 291 | 292 | fltReflect *= 1.0 - fltSchlick; 293 | 294 | if (fltReflect < 0.01) { 295 | break; 296 | } 297 | 298 | float fltReflection = dot(vecDirection, objIntersection.vecNormal); 299 | 300 | vecOrigin[0] = objIntersection.vecLocation[0]; 301 | vecOrigin[1] = objIntersection.vecLocation[1]; 302 | vecOrigin[2] = objIntersection.vecLocation[2]; 303 | 304 | vecDirection[0] = vecDirection[0] - (2.0 * fltReflection * objIntersection.vecNormal[0]); 305 | vecDirection[1] = vecDirection[1] - (2.0 * fltReflection * objIntersection.vecNormal[1]); 306 | vecDirection[2] = vecDirection[2] - (2.0 * fltReflection * objIntersection.vecNormal[2]); 307 | 308 | fltMin = 0.01; 309 | 310 | fltMax = 10000.0; 311 | } 312 | } 313 | 314 | extern "C" void EMSCRIPTEN_KEEPALIVE render(unsigned char* charPixels) { 315 | for (int intY = 0; intY < intHeight; intY += 1) { 316 | for (int intX = 0; intX < intWidth; intX += 1) { 317 | float fltX = (1.0 * intX / intWidth) - 0.5; 318 | float fltY = 0.5 - (1.0 * intY / intHeight); 319 | 320 | float vecColor[3] = { 0.0f, 0.0f, 0.0f }; 321 | float vecOrigin[3] = { 6.0f * cos(fltTime), 5.0f, 6.0f * sin(fltTime) }; 322 | float vecDirection[3] = { 0.0f - vecOrigin[0], 1.0f - vecOrigin[1], 0.0f - vecOrigin[2] }; 323 | 324 | normalize(vecDirection); 325 | 326 | float vecRight[3] = { 0.0, 0.0, 0.0 }; 327 | float vecUp[3] = { 0.0, 1.0, 0.0 }; 328 | 329 | cross(vecRight, vecDirection, vecUp); 330 | cross(vecUp, vecRight, vecDirection); 331 | 332 | vecDirection[0] += (fltX * vecRight[0]) + (fltY * vecUp[0]); 333 | vecDirection[1] += (fltX * vecRight[1]) + (fltY * vecUp[1]); 334 | vecDirection[2] += (fltX * vecRight[2]) + (fltY * vecUp[2]); 335 | 336 | raytrace(vecColor, vecOrigin, vecDirection, 1.0, 10000.0); 337 | 338 | charPixels[(intY * intWidth * 4) + (intX * 4) + 0] = fmin(255.0, 255.0 * vecColor[0]); 339 | charPixels[(intY * intWidth * 4) + (intX * 4) + 1] = fmin(255.0, 255.0 * vecColor[1]); 340 | charPixels[(intY * intWidth * 4) + (intX * 4) + 2] = fmin(255.0, 255.0 * vecColor[2]); 341 | charPixels[(intY * intWidth * 4) + (intX * 4) + 3] = 255; 342 | } 343 | } 344 | } 345 | 346 | // ---------------------------------------------------------- 347 | 348 | extern "C" void EMSCRIPTEN_KEEPALIVE uniform1i(char* charVariable, int intIndex, int intValue) { 349 | if (strcmp(charVariable, "intWidth") == 0) { 350 | intWidth = intValue; 351 | 352 | } else if (strcmp(charVariable, "intHeight") == 0) { 353 | intHeight = intValue; 354 | 355 | } else if (strcmp(charVariable, "objPlanes_length") == 0) { 356 | objPlanes_length = intValue; 357 | 358 | } else if (strcmp(charVariable, "objSpheres_length") == 0) { 359 | objSpheres_length = intValue; 360 | 361 | } else if (strcmp(charVariable, "objLights_length") == 0) { 362 | objLights_length = intValue; 363 | 364 | } 365 | } 366 | 367 | extern "C" void EMSCRIPTEN_KEEPALIVE uniform1f(char* charVariable, int intIndex, float fltValue) { 368 | if (strcmp(charVariable, "objPlanes[].fltSpecular") == 0) { 369 | objPlanes[intIndex].fltSpecular = fltValue; 370 | 371 | } else if (strcmp(charVariable, "objPlanes[].fltReflect") == 0) { 372 | objPlanes[intIndex].fltReflect = fltValue; 373 | 374 | } else if (strcmp(charVariable, "objSpheres[].fltRadius") == 0) { 375 | objSpheres[intIndex].fltRadius = fltValue; 376 | 377 | } else if (strcmp(charVariable, "objSpheres[].fltSpecular") == 0) { 378 | objSpheres[intIndex].fltSpecular = fltValue; 379 | 380 | } else if (strcmp(charVariable, "objSpheres[].fltReflect") == 0) { 381 | objSpheres[intIndex].fltReflect = fltValue; 382 | 383 | } else if (strcmp(charVariable, "fltTime") == 0) { 384 | fltTime = fltValue; 385 | 386 | } 387 | } 388 | 389 | extern "C" void EMSCRIPTEN_KEEPALIVE uniform3fv(char* charVariable, int intIndex, float fltValue_0, float fltValue_1, float fltValue_2) { 390 | if (strcmp(charVariable, "objPlanes[].vecLocation") == 0) { 391 | objPlanes[intIndex].vecLocation[0] = fltValue_0; 392 | objPlanes[intIndex].vecLocation[1] = fltValue_1; 393 | objPlanes[intIndex].vecLocation[2] = fltValue_2; 394 | 395 | } else if (strcmp(charVariable, "objPlanes[].vecNormal") == 0) { 396 | objPlanes[intIndex].vecNormal[0] = fltValue_0; 397 | objPlanes[intIndex].vecNormal[1] = fltValue_1; 398 | objPlanes[intIndex].vecNormal[2] = fltValue_2; 399 | 400 | } else if (strcmp(charVariable, "objPlanes[].vecColor") == 0) { 401 | objPlanes[intIndex].vecColor[0] = fltValue_0; 402 | objPlanes[intIndex].vecColor[1] = fltValue_1; 403 | objPlanes[intIndex].vecColor[2] = fltValue_2; 404 | 405 | } else if (strcmp(charVariable, "objSpheres[].vecLocation") == 0) { 406 | objSpheres[intIndex].vecLocation[0] = fltValue_0; 407 | objSpheres[intIndex].vecLocation[1] = fltValue_1; 408 | objSpheres[intIndex].vecLocation[2] = fltValue_2; 409 | 410 | } else if (strcmp(charVariable, "objSpheres[].vecColor") == 0) { 411 | objSpheres[intIndex].vecColor[0] = fltValue_0; 412 | objSpheres[intIndex].vecColor[1] = fltValue_1; 413 | objSpheres[intIndex].vecColor[2] = fltValue_2; 414 | 415 | } else if (strcmp(charVariable, "objLights[].vecLocation") == 0) { 416 | objLights[intIndex].vecLocation[0] = fltValue_0; 417 | objLights[intIndex].vecLocation[1] = fltValue_1; 418 | objLights[intIndex].vecLocation[2] = fltValue_2; 419 | 420 | } else if (strcmp(charVariable, "objLights[].vecIntensity") == 0) { 421 | objLights[intIndex].vecIntensity[0] = fltValue_0; 422 | objLights[intIndex].vecIntensity[1] = fltValue_1; 423 | objLights[intIndex].vecIntensity[2] = fltValue_2; 424 | 425 | } else if (strcmp(charVariable, "vecAmbient") == 0) { 426 | vecAmbient[0] = fltValue_0; 427 | vecAmbient[1] = fltValue_1; 428 | vecAmbient[2] = fltValue_2; 429 | 430 | } 431 | } 432 | -------------------------------------------------------------------------------- /emscripten.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
18 | 19 |
20 | Class 21 | 22 | 23 | 24 |
25 | Reddit 26 | 27 | 28 | 29 |
30 | GitHub 31 | 32 |
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36 | WASM Raytracer 37 |
38 | 39 |
40 |

While teaching a web development class, I wanted to present some benchmarks that show the performance benefits of asm.js as well as WebAssembly. I was unfortunately not able to find a suitable reference. Therefore, I implemented a simplistic raytracer in JavaScript as well as in C++ with a similar code structure while utilizing Emscripten to compile the C++ raytracer to asm.js as well as WebAssembly. For fun, I also translated the code to GLSL and am utilizing WebGL to leverage GPU computing.

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50 | 51 | JavaScript 52 | 53 | 54 | asm.js 55 | 56 | 57 | WebAssembly 58 | 59 | 60 | Shader 61 | 62 |
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79 | 80 | 126 | 127 | 180 | 181 | 182 | 195 | 196 | 197 | 249 | 250 | 251 | 303 | 304 | 305 | 323 | 324 | 425 | 426 | 427 | 428 | 429 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. We, the Free Software Foundation, use the 18 | GNU General Public License for most of our software; it applies also to 19 | any other work released this way by its authors. You can apply it to 20 | your programs, too. 21 | 22 | When we speak of free software, we are referring to freedom, not 23 | price. Our General Public Licenses are designed to make sure that you 24 | have the freedom to distribute copies of free software (and charge for 25 | them if you wish), that you receive source code or can get it if you 26 | want it, that you can change the software or use pieces of it in new 27 | free programs, and that you know you can do these things. 28 | 29 | To protect your rights, we need to prevent others from denying you 30 | these rights or asking you to surrender the rights. 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Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . --------------------------------------------------------------------------------