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WebGLUtil = (function() {
// ---------------------------------------------------------------------------
// Error handling (for obvious failures, such as invalid element ids)
function defaultErrorFunc(str) {
console.log('Error: ' + str);
}
var gErrorFunc = defaultErrorFunc;
function setErrorFunc(func) {
gErrorFunc = func;
}
function error(str) {
gErrorFunc(str);
}
// ---------------------------------------------------------------------------
// Warning handling (for failures that may be intentional)
function defaultWarningFunc(str) {
console.log('Warning: ' + str);
}
var gWarningFunc = defaultWarningFunc;
function setWarningFunc(func) {
gWarningFunc = func;
}
function warning(str) {
gWarningFunc(str);
}
// ---------------------------------------------------------------------------
// WebGL helpers
function getWebGL(canvasId, requireConformant, attributes) {
// `requireConformant` will default to falsey if it is not supplied.
var canvas = document.getElementById(canvasId);
var gl = null;
try {
gl = canvas.getContext('webgl', attributes);
} catch(e) {}
if (!gl && !requireConformant) {
try {
gl = canvas.getContext('experimental-webgl', attributes);
} catch(e) {}
}
if (!gl) {
error('WebGL context could not be retrieved from \'' + canvasId + '\'.');
return null;
}
return gl;
}
function withWebGL2(canvasId, callback, onFinished) {
var run = function() {
var canvas = document.getElementById(canvasId);
var gl = null;
try {
gl = canvas.getContext('webgl2');
} catch(e) {}
if (!gl) {
todo(false, 'WebGL2 is not supported');
onFinished();
return;
}
function errorFunc(str) {
ok(false, 'Error: ' + str);
}
setErrorFunc(errorFunc);
setWarningFunc(errorFunc);
callback(gl);
onFinished();
};
try {
var prefArrArr = [
['webgl.force-enabled', true],
['webgl.enable-webgl2', true],
];
var prefEnv = {'set': prefArrArr};
SpecialPowers.pushPrefEnv(prefEnv, run);
} catch (e) {
warning('No SpecialPowers, but trying WebGL2 anyway...');
run();
}
}
function getContentFromElem(elem) {
var str = "";
var k = elem.firstChild;
while (k) {
if (k.nodeType == 3)
str += k.textContent;
k = k.nextSibling;
}
return str;
}
// Returns a valid shader, or null on errors.
function createShaderById(gl, id) {
var elem = document.getElementById(id);
if (!elem) {
error('Failed to create shader from non-existent id \'' + id + '\'.');
return null;
}
var src = getContentFromElem(elem);
var shader;
if (elem.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
} else if (elem.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
} else {
error('Bad MIME type for shader \'' + id + '\': ' + elem.type + '.');
return null;
}
gl.shaderSource(shader, src);
gl.compileShader(shader);
return shader;
}
function createProgramByIds(gl, vsId, fsId) {
var vs = createShaderById(gl, vsId);
var fs = createShaderById(gl, fsId);
if (!vs || !fs)
return null;
var prog = gl.createProgram();
gl.attachShader(prog, vs);
gl.attachShader(prog, fs);
gl.linkProgram(prog);
if (!gl.getProgramParameter(prog, gl.LINK_STATUS)) {
var str = "Shader program linking failed:";
str += "\nShader program info log:\n" + gl.getProgramInfoLog(prog);
str += "\n\nVert shader log:\n" + gl.getShaderInfoLog(vs);
str += "\n\nFrag shader log:\n" + gl.getShaderInfoLog(fs);
warning(str);
return null;
}
return prog;
}
return {
setErrorFunc: setErrorFunc,
setWarningFunc: setWarningFunc,
getWebGL: getWebGL,
withWebGL2: withWebGL2,
createShaderById: createShaderById,
createProgramByIds: createProgramByIds,
};
})();
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