103 lines
3.1 KiB
JavaScript
103 lines
3.1 KiB
JavaScript
(function(){
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"use strict";
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function getParameters(context){
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const parameters = [];
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for (let name in context){
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if (name.toUpperCase() === name){
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const value = context.getParameter(context[name]);
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if (value !== null){
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parameters.push({name: name, value: value});
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}
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}
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}
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const debugExtension = context.getExtension("WEBGL_debug_renderer_info");
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for (let name in debugExtension){
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if (name.toUpperCase() === name){
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const value = context.getParameter(debugExtension[name]);
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if (value !== null){
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parameters.push({name: name, value: value});
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}
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}
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}
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const frontParameters = ["VENDOR", "RENDERER", "UNMASKED_VENDOR_WEBGL", "UNMASKED_RENDERER_WEBGL"];
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parameters.sort(function(a, b){
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const frontA = frontParameters.indexOf(a.name);
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const frontB = frontParameters.indexOf(b.name);
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if (frontA !== -1){
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if (frontB !== -1){
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return frontA - frontB;
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}
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else {
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return -1;
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}
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}
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else {
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if (frontB !== -1){
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return 1;
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}
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else {
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return a.name < b.name? -1: 1;
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}
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}
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});
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return parameters;
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}
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["webgl", "webgl2"].forEach(async function(context, index){
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const output = document.createElement("div");
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document.getElementById("output").appendChild(output);
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try {
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const canvas = document.createElement("canvas");
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canvas.width = 11;
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canvas.height = 13;
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const gl = canvas.getContext(context) || canvas.getContext("experimental-" + context);
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// paint it completely black
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gl.clearColor(index * 0.25, index * 0.25, index * 0.25, 1);
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gl.clear(gl.COLOR_BUFFER_BIT);
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const pixels = new Uint8Array(gl.drawingBufferWidth * gl.drawingBufferHeight * 4);
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gl.readPixels(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
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const values = {};
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let max = 0;
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for (let i = 0; i < pixels.length; i += 1){
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values[pixels[i]] = (values[pixels[i]] || 0) + 1;
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max = Math.max(max, values[pixels[i]]);
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}
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const parameters = getParameters(gl);
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if (context === "webgl2"){
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const parameterOutput = document.createElement("table");
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document.getElementById("parameters").appendChild(parameterOutput);
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parameters.forEach(function(parameter){
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const parameterRow = document.createElement("tr");
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parameterRow.innerHTML = "<td>" + parameter.name + "</td><td>" + parameter.value + "</td>";
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parameterOutput.appendChild(parameterRow);
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});
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}
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const hashBytes = await crypto.subtle.digest("SHA-256", new TextEncoder("utf-8")
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.encode(parameters.map(function(parameter){
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return parameter.name + ": " + parameter.value;
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}).join(",")));
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const chunks = [];
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(new Uint32Array(hashBytes)).forEach(function(num){
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chunks.push(num.toString(16));
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});
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const hash = chunks.map(function(chunk){
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return "0".repeat(8 - chunk.length) + chunk;
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}).join("");
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output.textContent = context + ": " +
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(max !== 3 * values[255]? "": "not ") + "supported " +
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"(parameter hash: " + hash + ")";
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output.title = JSON.stringify(values);
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}
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catch (error){
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output.textContent = context + ": ERROR";
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output.title = error;
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}
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});
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}()); |