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WebGLUtil = (function () {
// ---------------------------------------------------------------------------
// WebGL helpers
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;
}
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();
}
}
// Returns a valid shader, or null on errors.
function createShaderById(gl, id) {
var elem = document.getElementById(id);
if (!elem) {
throw new Error(
"Failed to create shader from non-existent id '" + id + "'."
);
}
var src = elem.innerHTML.trim();
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 {
throw new Error(
"Bad MIME type for shader '" + id + "': " + elem.type + "."
);
}
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);
console.error(str);
return null;
}
return prog;
}
return {
withWebGL2,
createShaderById,
createProgramByIds,
linkProgramByIds(gl, vertSrcElem, fragSrcElem) {
const prog = gl.createProgram();
function attachShaderById(type, srcElem) {
const shader = gl.createShader(type);
gl.shaderSource(shader, srcElem.innerHTML.trim() + "\n");
gl.compileShader(shader);
gl.attachShader(prog, shader);
prog[type] = shader;
}
attachShaderById(gl.VERTEX_SHADER, vertSrcElem);
attachShaderById(gl.FRAGMENT_SHADER, fragSrcElem);
gl.linkProgram(prog);
const success = gl.getProgramParameter(prog, gl.LINK_STATUS);
if (!success) {
console.error("Error linking program:");
console.error("\nLink log: " + gl.getProgramInfoLog(prog));
console.error(
"\nVert shader log: " + gl.getShaderInfoLog(prog[gl.VERTEX_SHADER])
);
console.error(
"\nFrag shader log: " + gl.getShaderInfoLog(prog[gl.FRAGMENT_SHADER])
);
return null;
}
gl.deleteShader(prog[gl.VERTEX_SHADER]);
gl.deleteShader(prog[gl.FRAGMENT_SHADER]);
let count = gl.getProgramParameter(prog, gl.ACTIVE_ATTRIBUTES);
for (let i = 0; i < count; i++) {
const info = gl.getActiveAttrib(prog, i);
prog[info.name] = gl.getAttribLocation(prog, info.name);
}
count = gl.getProgramParameter(prog, gl.ACTIVE_UNIFORMS);
for (let i = 0; i < count; i++) {
const info = gl.getActiveUniform(prog, i);
prog[info.name] = gl.getUniformLocation(prog, info.name);
}
return prog;
},
};
})();
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