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// WebGLWorker client code
function assert(x) {
if (!x) throw 'failed assert';
}
function WebGLClient() {
var objects = {};
function fixArgs(command, args) {
switch (command) {
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 'bindBuffer': args[1] = objects[args[1]]; 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 command = buffer[i++];
assert(typeof command === 'string')
var numArgs = buffer[i++];
//dump('issue ' + [command, numArgs, 'peek:' + buffer.slice(i, i+5)] + '\n');
if (numArgs === 0) {
//dump('issue: ' + command + '\n');
ctx[command]();
} else if (numArgs > 0) {
var args = fixArgs(command, buffer.slice(i, i+numArgs));
i += numArgs;
//dump('issue+: ' + command + '(' + args + '), ' + numArgs + '\n');
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);
}
assert(i <= len);
}
}
this.onmessage = function(msg) {
dump('client GL got ' + JSON.stringify(msg) + '\n');
switch(msg.op) {
case 'render': {
renderCommands(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'].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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