1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/canvas/test/webgl-conformance/extra/slow-shader-example.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,116 @@
1.4 +<!--
1.5 +Copyright (c) 2009 The Chromium Authors. All rights reserved.
1.6 +Use of this source code is governed by a BSD-style license that can be
1.7 +found in the LICENSE file.
1.8 + -->
1.9 +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
1.10 + "http://www.w3.org/TR/html4/loose.dtd">
1.11 +<html>
1.12 +<head>
1.13 +<meta charset="utf-8">
1.14 +<title>WebGL Slow Shader example.</title>
1.15 +<link rel="stylesheet" href="../resources/js-test-style.css"/>
1.16 +<script src="../resources/js-test-pre.js"></script>
1.17 +<script src="../conformance/resources/webgl-test-utils.js"> </script>
1.18 +</head>
1.19 +<body>
1.20 +<canvas id="example" width="1024" height="1024" style="width: 40px; height: 40px;">
1.21 +</canvas>
1.22 +<div id="description"></div>
1.23 +<div id="console"></div>
1.24 +<script id="slow" type="text/something-not-javascript">
1.25 +precision mediump float;
1.26 +uniform sampler2D tex;
1.27 +varying vec2 texCoord;
1.28 +void main() {
1.29 + gl_FragColor = texture2D(tex, texture2D(tex, texture2D(tex, texCoord).xy).xy);
1.30 +}
1.31 +</script>
1.32 +<script>
1.33 +window.onload = main;
1.34 +
1.35 +debug("Tests drawing a very slow shader.");
1.36 +var wtu = WebGLTestUtils;
1.37 +var canvas = document.getElementById("example");
1.38 +canvas.addEventListener("webglcontextlost", function(e) { e.preventDefault(); }, false);
1.39 +canvas.addEventListener("webglcontextrestored", function(e) { }, false);
1.40 +var gl = wtu.create3DContext(canvas);
1.41 +var maxTexSize = gl.getParameter(gl.MAX_TEXTURE_SIZE);
1.42 +var texSize = Math.min(maxTexSize, 4096);
1.43 +debug("Max Texture size: " + maxTexSize);
1.44 +debug("Texture size: " + texSize);
1.45 +var shaderSource =
1.46 + document.getElementById("slow").text.replace(/\$size/g, texSize + ".0");
1.47 +wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after getting a context");
1.48 +var vs = wtu.setupSimpleTextureVertexShader(gl);
1.49 +var fs = wtu.loadShader(
1.50 + gl,
1.51 + shaderSource,
1.52 + gl.FRAGMENT_SHADER)
1.53 +var program = wtu.setupProgram(
1.54 + gl,
1.55 + [vs, fs],
1.56 + ['vPosition', 'texCoord0'],
1.57 + [0, 1]);
1.58 +wtu.setupUnitQuad(gl, 0, 1);
1.59 +wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after program setup");
1.60 +var tex = gl.createTexture();
1.61 +gl.enable(gl.BLEND);
1.62 +gl.disable(gl.DEPTH_TEST);
1.63 +
1.64 +wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating texture");
1.65 +debug("preparing...");
1.66 +var numBytes = texSize * texSize * 4;
1.67 +var pixelBuf = new ArrayBuffer(numBytes);
1.68 +var pixels = new Uint8Array(pixelBuf);
1.69 +for (var ii = 0; ii < numBytes; ++ii) {
1.70 + pixels[ii] = Math.random() * 255;
1.71 +}
1.72 +gl.bindTexture(gl.TEXTURE_2D, tex);
1.73 +gl.texImage2D(
1.74 + gl.TEXTURE_2D, 0, gl.RGBA, texSize, texSize, 0,
1.75 + gl.RGBA, gl.UNSIGNED_BYTE, pixels);
1.76 +wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture setup");
1.77 +
1.78 +gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
1.79 +gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
1.80 +gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
1.81 +gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
1.82 +wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture param setting");
1.83 +
1.84 +var loc = gl.getUniformLocation(program, "tex");
1.85 +wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after getting tex location");
1.86 +gl.uniform1i(loc, 0);
1.87 +wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting tex uniform");
1.88 +
1.89 +var numQuads = 1000;
1.90 +var indexBuf = new ArrayBuffer(numQuads * 6);
1.91 +var indices = new Uint8Array(indexBuf);
1.92 +for (var ii = 0; ii < numQuads; ++ii) {
1.93 + var offset = ii * 6;
1.94 + indices[offset + 0] = 0;
1.95 + indices[offset + 1] = 1;
1.96 + indices[offset + 2] = 2;
1.97 + indices[offset + 3] = 3;
1.98 + indices[offset + 4] = 4;
1.99 + indices[offset + 5] = 5;
1.100 +}
1.101 +var indexBuffer = gl.createBuffer();
1.102 +gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
1.103 +gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
1.104 +wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting up indices");
1.105 +
1.106 +function main () {
1.107 + if (confirm(
1.108 + "after clicking ok your machine may be come unresponsive or crash")) {
1.109 + gl.drawElements(gl.TRIANGLES, numQuads * 6, gl.UNSIGNED_BYTE, 0);
1.110 + wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
1.111 + } else {
1.112 + debug("cancelled");
1.113 + }
1.114 +}
1.115 +
1.116 +successfullyParsed = true;
1.117 +</script>
1.118 +</body>
1.119 +</html>
