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webgl-matmul-rgba.js
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webgl-matmul-rgba.js
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function createFromRGBAProgram(gl, width, height) {
const fragmentShaderSource = `#version 300 es
precision highp float;
in vec2 TexCoord;
out vec4 TexelValue;
// Texture samplers
uniform sampler2D A;
void main()
{
int x = int(TexCoord.s * ${width}.0); // rescale
int y = int(TexCoord.t * ${height}.0); // rescale
int srcX = x / 4;
int channel = x - srcX * 4;
vec4 value = texelFetch(A, ivec2(srcX, y), 0);
if(channel == 0) {
TexelValue = vec4(value.r);
} else if(channel == 1) {
TexelValue = vec4(value.g);
} else if(channel == 2) {
TexelValue = vec4(value.b);
} else {
TexelValue = vec4(value.a);
}
}`;
const program = createProgram(
gl, getDefaultVertexShader(gl),
compileShader(gl, fragmentShaderSource, gl.FRAGMENT_SHADER));
return program;
}
function fromRGBA(gl, texSrc, texDest, width, height) {
const fromRGBAKey =
`fromRGBA-${width}-${height}`;
let program = getProgram(fromRGBAKey);
if (!program) {
program = createFromRGBAProgram(gl, width, height);
cacheProgram(fromRGBAKey, program);
}
const handleA = gl.getUniformLocation(program, 'A');
gl.useProgram(program);
// Create and bind a framebuffer
attachOutputTexture(gl, texDest);
gl.viewport(0, 0, width, height);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texSrc);
gl.uniform1i(handleA, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
gl.flush();
}
function createToRGBAProgram(gl, width, height, srcWidth, srcHeight, axis) {
const remainderLine = axis ===0 ? `int remainder = ${srcWidth} - x;` : `int remainder = ${srcHeight} - y;`;
const ivecPlus1 = axis ===0 ? `ivec2 up1 = ivec2(1,0);` : `ivec2 up1 = ivec2(0,1);`;
const ivecPlus2 = axis ===0 ? `ivec2 up2 = ivec2(2,0);` : `ivec2 up2 = ivec2(0,2);`;
const ivecPlus3 = axis ===0 ? `ivec2 up3 = ivec2(3,0);` : `ivec2 up3 = ivec2(0,3);`;
const fragmentShaderSource = `#version 300 es
precision highp float;
in vec2 TexCoord;
out vec4 TexelValue;
// Texture samplers
uniform sampler2D A;
void main()
{
int x = int(TexCoord.s * ${width}.0); // rescale
int y = int(TexCoord.t * ${height}.0); // rescale
${remainderLine}
${ivecPlus1}
${ivecPlus2}
${ivecPlus3}
ivec2 xy = ivec2(x,y);
if(remainder >= 4) {
TexelValue = vec4(
texelFetch(A, xy, 0).r,
texelFetch(A, xy + up1, 0).r,
texelFetch(A, xy + up2, 0).r,
texelFetch(A, xy + up3, 0).r);
} else if(remainder == 3) {
TexelValue = vec4(
texelFetch(A, xy, 0).r,
texelFetch(A, xy + up1, 0).r,
texelFetch(A, xy + up2, 0).r,
0.0);
} else if(remainder == 2) {
TexelValue = vec4(
texelFetch(A, xy, 0).r,
texelFetch(A, xy + up1, 0).r,
0.0,
0.0);
} else {
TexelValue = vec4(
texelFetch(A, xy, 0).r,
0.0,
0.0,
0.0);
}
}`;
const program = createProgram(
gl, getDefaultVertexShader(gl),
compileShader(gl, fragmentShaderSource, gl.FRAGMENT_SHADER));
return program;
}
function toRGBA(gl, texSrc, texDest, width, height, srcWidth, srcHeight, axis) {
const toRGBAKey =
`toRGBA-${width}-${height}-${srcWidth}-${srcHeight}-${axis}`;
let program = getProgram(toRGBAKey);
if (!program) {
program = createToRGBAProgram(gl, width, height, srcWidth, srcHeight, axis);
cacheProgram(toRGBAKey, program);
}
const handleA = gl.getUniformLocation(program, 'A');
gl.useProgram(program);
// Create and bind a framebuffer
attachOutputTexture(gl, texDest);
gl.viewport(0, 0, width, height);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texSrc);
gl.uniform1i(handleA, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
gl.flush();
}
function createMatMulProgram(gl, width, height, sharedDim) {
const adjustedSharedDim = Math.ceil(sharedDim / 4);
const fragmentShaderSource = `#version 300 es
precision highp float;
in vec2 TexCoord;
out vec4 TexelValue;
// Texture samplers
uniform sampler2D A;
uniform sampler2D B;
void main()
{
float value = 0.0;
int x = int(TexCoord.s * ${width}.0); // rescale
int y = int(TexCoord.t * ${height}.0); // rescale
// loop over the shared dim
for(int k=0; k < ${adjustedSharedDim}; ++k) {
vec4 a = texelFetch(A, ivec2(k, x), 0);
vec4 b = texelFetch(B, ivec2(y, k), 0);
value += dot(a, b);
}
TexelValue = vec4(value);
}`;
const program = createProgram(gl, getDefaultVertexShader(gl),
compileShader(gl, fragmentShaderSource, gl.FRAGMENT_SHADER));
return program;
}
function runMatMul(gl, texA, texB, width, height, texC, sharedDim) {
const matmulKey =
`matmul-matmul-RGBA-${width}-${height}-${sharedDim}`;
let program = getProgram(matmulKey);
if (!program) {
program = createMatMulProgram(gl, width, height, sharedDim);
cacheProgram(matmulKey, program);
}
const handleA = gl.getUniformLocation(program, 'A');
const handleB = gl.getUniformLocation(program, 'B');
gl.useProgram(program);
attachOutputTexture(gl, texC);
gl.viewport(0, 0, width, height);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texA);
gl.uniform1i(handleA, 0);
gl.activeTexture(gl.TEXTURE1);
gl.bindTexture(gl.TEXTURE_2D, texB);
gl.uniform1i(handleB, 1);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
gl.flush();
};
// CPU Equivalent for result comparison only
function cpuMatMul(a, shapeA, b, shapeB, c) {
let offset = 0;
for (let i = 0; i < shapeA[0]; i++) {
for (let j = 0; j < shapeB[1]; j++) {
let sum = 0;
for (let k = 0; k < shapeA[1]; k++) {
sum += a[i * shapeA[1] + k] * b[k * shapeB[1] + j];
}
c[offset] = sum;
offset++;
}
}
}
//
// Main
//
function main() {
const canvas = createCanvas(1, 1);
const gl = getContext(canvas);
setupVBO(gl);
createFrameBuffer(gl);
//for (let dim0 = 200; dim0 < 2000; dim0 += 500) {
// const sharedDim = dim0 - 100;
// const shapeA = [dim0, sharedDim];
// const shapeB = [sharedDim, dim0 + 100];
const sharedDim = 3;
const shapeA = [2, sharedDim];
const shapeB = [sharedDim, 2];
console.info(
`Running matmul for [${shapeA.toString()}]-[${shapeB.toString()}]`);
const width = shapeB[1];
const height = shapeA[0];
// const a = new Float32Array(new Array(shapeA[0] * shapeA[1])
// .fill(0)
// .map(v => Math.floor(Math.random() * 10)));
const a = new Float32Array([1,2,2,1,1,2]);
const texA =
createTexture(gl, gl.R32F, gl.RED, gl.FLOAT, shapeA[1], shapeA[0], a);
const texAPrime =
createTexture(gl, gl.RGBA32F, gl.RGBA, gl.FLOAT, Math.ceil(shapeA[1]/4), shapeA[0], null);
// const b = new Float32Array(new Array(shapeB[0] * shapeB[1])
// .fill(0)
// .map(v => Math.floor(Math.random() * 10)));
const b = new Float32Array([1,2,3,3,2,1]);
const texB =
createTexture(gl, gl.R32F, gl.RED, gl.FLOAT, shapeB[1], shapeB[0], b);
const texBPrime =
createTexture(gl, gl.RGBA32F, gl.RGBA, gl.FLOAT, shapeB[1], Math.ceil(shapeB[0]/4), null);
const c = new Float32Array(width * height);
// const texCPrime =
// createTexture(gl, gl.RGBA32F, gl.RGBA, gl.FLOAT, Math.ceil(width/4), height, null);
const texC =
createTexture(gl, gl.R32F, gl.RED, gl.FLOAT, width, height, null);
const count = 1;
const compare = true;
for (let i = 0; i < count; ++i) {
console.time('matmul-RGBA');
toRGBA(gl, texA, texAPrime, Math.ceil(shapeA[1]/4), shapeA[0], shapeA[1], shapeA[0], 0);
debugPrintTexture(gl, texAPrime, Math.ceil(shapeA[1]/4), shapeA[0], gl.RGBA, gl.FLOAT);
toRGBA(gl, texB, texBPrime, shapeB[1], Math.ceil(shapeB[0]/4), shapeB[1], shapeB[0], 1);
debugPrintTexture(gl, texBPrime, shapeB[1], Math.ceil(shapeB[0]/4), gl.RGBA, gl.FLOAT);
runMatMul(gl, texAPrime, texBPrime, width, height, texC, sharedDim);
//debugPrintTexture(gl, texC, width, height, gl.RED, gl.FLOAT);
//fromRGBA(gl, texCPrime, texC, width, height);
readOutput(gl, width, height, gl.RED, gl.FLOAT, c);
console.timeEnd('matmul-RGBA');
if (i === 0 && compare) {
const expected = new Float32Array(width * height);
cpuMatMul(a, shapeA, b, shapeB, expected);
if (!compareOutputs(c, expected, 0.1)) {
console.error('Expected and Actual did not match');
console.log(c);
console.log(expected)
} else {
console.info('Actual and expected matched!')
}
}
}
gl.deleteTexture(texA);
gl.deleteTexture(texB);
gl.deleteTexture(texC);
//}
}
main();