1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/canvas/test/webgl-conformance/conformance/glsl/misc/glsl-vertex-branch.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,130 @@
1.4 +<!--
1.5 +Copyright (c) 2011 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>
1.10 +<html>
1.11 +<head>
1.12 +<meta charset="utf-8">
1.13 +<title>GLSL function nodes Test</title>
1.14 +<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
1.15 +<link rel="stylesheet" href="../../resources/glsl-feature-tests.css"/>
1.16 +<script src="../../../resources/js-test-pre.js"></script>
1.17 +<script src="../../resources/webgl-test.js"> </script>
1.18 +<script src="../../resources/webgl-test-utils.js"> </script>
1.19 +
1.20 +<script id="vshaderNoBranch", type="x-shader/x-vertex">
1.21 +attribute vec3 aPosition;
1.22 +uniform float redIntensity;
1.23 +
1.24 +varying vec4 vColor;
1.25 +
1.26 +float MADBug(float paramValue) {
1.27 + float localVar = 1.0;
1.28 + return 0.25 * ceil(localVar) + paramValue;
1.29 +}
1.30 +
1.31 +void main(void) {
1.32 + gl_Position = vec4(aPosition, 1.0);
1.33 + vColor = vec4(MADBug(redIntensity), 0., 0., 1.);
1.34 +}
1.35 +</script>
1.36 +
1.37 +<script id="vshaderBranch", type="x-shader/x-vertex">
1.38 +attribute vec3 aPosition;
1.39 +uniform float redIntensity;
1.40 +
1.41 +varying vec4 vColor;
1.42 +
1.43 +float MADBug(float paramValue) {
1.44 + float localVar = 1.0;
1.45 + return 0.25 * ceil(localVar) + paramValue;
1.46 +}
1.47 +
1.48 +void main(void) {
1.49 + float condition = 42.;
1.50 + if (condition == 0.) {}
1.51 + gl_Position = vec4(aPosition, 1.0);
1.52 + vColor = vec4(MADBug(redIntensity), 0., 0., 1.);
1.53 +}
1.54 +</script>
1.55 +
1.56 +<script id="fshader", type="x-shader/x-fragment">
1.57 +#if defined(GL_ES)
1.58 +precision mediump float;
1.59 +#endif
1.60 +varying vec4 vColor;
1.61 +void main()
1.62 +{
1.63 + gl_FragColor = vColor;
1.64 +}
1.65 +</script>
1.66 +</head>
1.67 +<body>
1.68 +<canvas id="canvasNoBranch" width="50" height="50"></canvas>
1.69 +<canvas id="canvasBranch" width="50" height="50"></canvas>
1.70 +<div id="description">This tests against a Mac driver bug related to branches
1.71 + inside of Vertex Shaders.</div>
1.72 +<div id="console"></div>
1.73 +<script>
1.74 +var width = 50;
1.75 +var height = 50;
1.76 +
1.77 +function drawAndRead(canvasID, vshaderID, buffer)
1.78 +{
1.79 + var gl = initWebGL(canvasID, vshaderID, "fshader", ["aPosition"], [0, 0, 0, 1], 1);
1.80 + var vertexObject = gl.createBuffer();
1.81 + gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
1.82 + gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -1,-1,0, 1,-1,0 ]), gl.STATIC_DRAW);
1.83 + gl.enableVertexAttribArray(0);
1.84 + gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
1.85 +
1.86 + var loc = gl.getUniformLocation(gl.program, "redIntensity");
1.87 + gl.uniform1f(loc, 0.75);
1.88 + gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
1.89 + gl.drawArrays(gl.TRIANGLES, 0, 3);
1.90 + gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buffer);
1.91 + if (gl.getError() != gl.NO_ERROR)
1.92 + return false;
1.93 + return true;
1.94 +}
1.95 +
1.96 +function compareRendering(buffer1, buffer2, tol)
1.97 +{
1.98 + for (var i = 0; i < width * height * 4; ++i) {
1.99 + if (Math.abs(buffer1[i] - buffer2[i]) > tol)
1.100 + return false;
1.101 + }
1.102 + return true;
1.103 +}
1.104 +
1.105 +function init()
1.106 +{
1.107 + if (window.initNonKhronosFramework) {
1.108 + window.initNonKhronosFramework(false);
1.109 + }
1.110 +
1.111 + description("tests vertex shader with branch");
1.112 +
1.113 + var bufBranch = new Uint8Array(width * height * 4);
1.114 + var bufNoBranch = new Uint8Array(width * height * 4);
1.115 +
1.116 + if (drawAndRead("canvasBranch", "vshaderBranch", bufBranch) == false ||
1.117 + drawAndRead("canvasNoBranch", "vshaderNoBranch", bufNoBranch) == false) {
1.118 + testFailed("Setup failed");
1.119 + } else {
1.120 + if (compareRendering(bufBranch, bufNoBranch, 4) == false)
1.121 + testFailed("Rendering results are different");
1.122 + else
1.123 + testPassed("Rendering results are the same");
1.124 + }
1.125 +}
1.126 +
1.127 +init();
1.128 +successfullyParsed = true;
1.129 +</script>
1.130 +<script>finishTest();</script>
1.131 +</body>
1.132 +</html>
1.133 +
