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// WebGLWorker client code
function assert(x) {
if (!x) throw 'failed assert';
}
function WebGLClient() {
var objects = {};
var calls = {
0: { name: 'NULL', args: 0 },
1: { name: 'getExtension', args: 1 },
2: { name: 'enable', args: 1 },
3: { name: 'disable', args: 1 },
4: { name: 'clear', args: 1 },
5: { name: 'clearColor', args: 4 },
6: { name: 'createShader', args: -2 },
7: { name: 'deleteShader', args: 1 },
8: { name: 'shaderSource', args: 2 },
9: { name: 'compileShader', args: 1 },
10: { name: 'createProgram', args: -1 },
11: { name: 'deleteProgram', args: 1 },
12: { name: 'attachShader', args: 2 },
13: { name: 'bindAttribLocation', args: 3 },
14: { name: 'linkProgram', args: 1 },
15: { name: 'getProgramParameter', args: 2 },
16: { name: 'getUniformLocation', args: -3 },
17: { name: 'useProgram', args: 1 },
18: { name: 'uniform1i', args: 2 },
19: { name: 'uniform1f', args: 2 },
20: { name: 'uniform3fv', args: 2 },
21: { name: 'uniform4fv', args: 2 },
22: { name: 'uniformMatrix4fv', args: 3 },
23: { name: 'vertexAttrib4fv', args: 2 },
24: { name: 'createBuffer', args: -1 },
25: { name: 'deleteBuffer', args: 1 },
26: { name: 'bindBuffer', args: 2 },
27: { name: 'bufferData', args: 3 },
28: { name: 'bufferSubData', args: 3 },
29: { name: 'viewport', args: 4 },
30: { name: 'vertexAttribPointer', args: 6 },
31: { name: 'enableVertexAttribArray', args: 1 },
32: { name: 'disableVertexAttribArray', args: 1 },
33: { name: 'drawArrays', args: 3 },
34: { name: 'drawElements', args: 4 },
35: { name: 'getError', args: 0 },
36: { name: 'createTexture', args: -1 },
37: { name: 'deleteTexture', args: 1 },
38: { name: 'bindTexture', args: 2 },
39: { name: 'texParameteri', args: 3 },
40: { name: 'texImage2D', args: 9 },
41: { name: 'compressedTexImage2D', args: 7 },
42: { name: 'activeTexture', args: 1 },
43: { name: 'getShaderParameter', args: 2 },
44: { name: 'clearDepth', args: 1 },
45: { name: 'depthFunc', args: 1 },
46: { name: 'frontFace', args: 1 },
47: { name: 'cullFace', args: 1 },
48: { name: 'pixelStorei', args: 2 },
49: { name: 'depthMask', args: 1 },
50: { name: 'depthRange', args: 2 },
51: { name: 'blendFunc', args: 2 },
52: { name: 'scissor', args: 4 },
53: { name: 'colorMask', args: 4 },
54: { name: 'lineWidth', args: 1 },
55: { name: 'createFramebuffer', args: -1 },
56: { name: 'deleteFramebuffer', args: 1 },
57: { name: 'bindFramebuffer', args: 2 },
58: { name: 'framebufferTexture2D', args: 5 },
59: { name: 'createRenderbuffer', args: -1 },
60: { name: 'deleteRenderbuffer', args: 1 },
61: { name: 'bindRenderbuffer', args: 2 },
62: { name: 'renderbufferStorage', args: 4 },
63: { name: 'framebufferRenderbuffer', args: 4 },
64: { name: 'debugPrint', args: 1 },
};
function fixArgs(command, args) {
switch (command) {
case 'deleteFramebuffer':
case 'deleteRenderbuffer':
case 'deleteBuffer':
case 'deleteShader':
case 'deleteProgram':
case 'deleteTexture': {
var id = args[0];
args[0] = objects[id];
objects[id] = null; // stop holding on to the object globally
break;
}
case 'getProgramParameter':
case 'getShaderParameter':
case 'uniform1i':
case 'uniform1f':
case 'uniform3fv':
case 'uniform4fv':
case 'uniformMatrix4fv':
case 'getUniformLocation':
case 'useProgram':
case 'linkProgram':
case 'bindAttribLocation':
case 'compileShader':
case 'shaderSource': args[0] = objects[args[0]]; break;
case 'attachShader': args[0] = objects[args[0]]; args[1] = objects[args[1]]; break;
case 'bindRenderbuffer':
case 'bindFramebuffer':
case 'bindTexture':
case 'bindBuffer': args[1] = args[1] ? objects[args[1]] : null; break;
case 'framebufferRenderbuffer':
case 'framebufferTexture2D': args[3] = args[3] ? objects[args[3]] : null; break;
}
return args;
}
function renderCommands(buffer) {
var ctx = Module.ctx;
var i = 0;
var len = buffer.length;
//dump('issuing commands, buffer len: ' + len + '\n');
while (i < len) {
var info = calls[buffer[i++]];
var command = info.name;
assert(typeof command === 'string')
var numArgs = info.args;
assert(typeof numArgs === 'number', command);
//dump('issue ' + [command, numArgs, 'peek:' + buffer.slice(i, i+5)] + '\n');
if (numArgs === 0) {
//dump('issue: ' + command + '\n');
if (command === 'getError') {
assert(ctx.getError() === ctx.NO_ERROR, 'we cannot handle errors, we are async proxied WebGL');
} else {
ctx[command]();
}
} else if (numArgs > 0) {
var args = fixArgs(command, buffer.slice(i, i+numArgs));
i += numArgs;
//dump('issue+: ' + command + '(' + args + '), ' + numArgs + '\n');
if (command === 'getShaderParameter' || command === 'getProgramParameter') {
assert(ctx[command](args[0], args[1]), 'we cannot handle errors, we are async proxied WebGL');
//} else if (command === 'debugPrint') {
// dump(args[0] + '\n');
} else {
ctx[command].apply(ctx, args);
}
} else {
// negative means a constructor, last argument is the id to save as
numArgs = -numArgs - 1;
var args = fixArgs(command, buffer.slice(i, i+numArgs));
i += numArgs;
var id = buffer[i++];
//dump('issue-: ' + command + '(' + args + '), ' + numArgs + '\n');
objects[id] = ctx[command].apply(ctx, args);
}
//var err;
//while ((err = ctx.getError()) !== ctx.NO_ERROR) {
// dump('warning: GL error ' + err + ', after ' + [command, numArgs] + '\n');
//}
assert(i <= len);
}
}
var commandBuffers = [];
function renderAllCommands() {
// TODO: we can avoid running commands from buffers that are not the last, if they
// have no side effects, as each buffer is from a different frame
//if (commandBuffers.length > 1) dump('extra buffs: ' + (commandBuffers.length-1) + '\n');
for (var i = 0; i < commandBuffers.length; i++) {
renderCommands(commandBuffers[i]);
}
commandBuffers.length = 0;
}
this.onmessage = function(msg) {
//dump('client GL got ' + JSON.stringify(msg) + '\n');
switch(msg.op) {
case 'render': {
if (commandBuffers.length === 0) {
// requestion a new frame, we will clear the buffers after rendering them
window.requestAnimationFrame(renderAllCommands);
}
commandBuffers.push(msg.commandBuffer);
break;
}
default: throw 'weird gl onmessage ' + JSON.stringify(msg);
}
};
}
WebGLClient.prefetch = function() {
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('webgl-experimental') || canvas.getContext('webgl');
if (!ctx) return;
var parameters = {};
['MAX_VERTEX_ATTRIBS', 'MAX_TEXTURE_IMAGE_UNITS', 'MAX_TEXTURE_SIZE', 'MAX_CUBE_MAP_TEXTURE_SIZE', 'MAX_VERTEX_UNIFORM_VECTORS', 'MAX_FRAGMENT_UNIFORM_VECTORS', 'MAX_VARYING_VECTORS', 'MAX_COMBINED_TEXTURE_IMAGE_UNITS', 'VENDOR', 'RENDERER', 'VERSION'].forEach(function(name) {
parameters[ctx[name]] = ctx.getParameter(ctx[name]);
});
worker.postMessage({ target: 'gl', op: 'setPrefetched', parameters: parameters, extensions: ctx.getSupportedExtensions() });
};
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