dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/fragcoord-linking-bug.html

   1 <!--
   2 Copyright (c) 2019 The Khronos Group Inc.
   3 Use of this source code is governed by an MIT-style license that can be
   4 found in the LICENSE.txt file.
   5 -->
   6
   7 <!DOCTYPE html>
   8 <html>
   9 <head>
  10 <meta charset="utf-8">
  11 <title>GLSL compiler bug referencing gl_FragCoord</title>
  12 <link rel="stylesheet" href="../../../resources/js-test-style.css"/>
  13 <script src="../../../js/js-test-pre.js"></script>
  14 <script src="../../../js/webgl-test-utils.js"></script>
  15 </head>
  16 <body>
  17 <!-- These shaders were extracted from Skia's GPU accelerated backend "Ganesh". -->
  18 <script id="shader-vs" type="x-shader/x-vertex">
  19 uniform mat3 uViewM;
  20 uniform mat3 uStageMatrix_Stage1;
  21 uniform vec4 urtAdjustment;
  22 attribute vec2 aPosition;
  23 attribute vec4 aColor;
  24 varying vec4 vColor;
  25 varying vec2 vMatrixCoord_Stage1;
  26 void main() {
  27     vec3 pos3 = uViewM * vec3(aPosition, 1);
  28     vColor = aColor;
  29     { // Stage 0: XferEffect
  30     }
  31     vMatrixCoord_Stage1 = (uStageMatrix_Stage1 * vec3(aPosition, 1)).xy;
  32     { // Stage 1: Texture
  33     }
  34     gl_Position = vec4(dot(pos3.xz, urtAdjustment.xy), dot(pos3.yz, urtAdjustment.zw), 0, pos3.z);
  35 }
  36 </script>
  37
  38 <script id="shader-fs" type="x-shader/x-fragment">
  39 precision mediump float;
  40 uniform sampler2D uDstCopySampler;
  41 uniform vec2 uDstCopyUpperLeft;
  42 uniform vec2 uDstCopyCoordScale;
  43 uniform float uRTHeight;
  44 uniform sampler2D uSampler0_Stage1;
  45 varying vec4 vColor;
  46 varying vec2 vMatrixCoord_Stage1;
  47 void main() {
  48     vec4 fragCoordYDown = vec4(gl_FragCoord.x, uRTHeight - gl_FragCoord.y, gl_FragCoord.zw);
  49     // Read color from copy of the destination.
  50     vec2 _dstTexCoord = (fragCoordYDown.xy - uDstCopyUpperLeft) * uDstCopyCoordScale;
  51     _dstTexCoord.y = 1.0 - _dstTexCoord.y;
  52     vec4 _dstColor = texture2D(uDstCopySampler, _dstTexCoord);
  53
  54     vec4 output_Stage0;
  55     { // Stage 0: XferEffect
  56         // SkXfermode::Mode: Multiply
  57         output_Stage0.a = vColor.a + (1.0 - vColor.a) * _dstColor.a;
  58         output_Stage0.rgb = (1.0 - vColor.a) * _dstColor.rgb + (1.0 - _dstColor.a) * vColor.rgb + vColor.rgb * _dstColor.rgb;
  59     }
  60     vec4 output_Stage1;
  61     { // Stage 1: Texture
  62     output_Stage1 = texture2D(uSampler0_Stage1, vMatrixCoord_Stage1);
  63     }
  64     gl_FragColor = ((output_Stage0 * output_Stage1) + ((vec4(1) - output_Stage1) * _dstColor));
  65 }
  66 </script>
  67 <div id="description"></div>
  68 <div id="console"></div>
  69 <script>
  70 "use strict";
  71
  72 description();
  73 debug("");
  74 debug('Verify shaders using gl_FragCoord z and w components compile and link correctly');
  75 debug('Regression test for Qualcomm bug ID CR649654');
  76 var wtu = WebGLTestUtils;
  77 var gl = wtu.create3DContext();
  78 if (!gl) {
  79   testFailed("context does not exist");
  80 } else {
  81   var program = wtu.setupProgram(gl, ["shader-vs", "shader-fs"], null, null, true);
  82   if (program) {
  83     testPassed("Program compiled and linked successfully");
  84   } else {
  85     testFailed("Program failed to compile and link");
  86   }
  87 }
  88
  89 var successfullyParsed = true;
  90 </script>
  91 <script src="../../../js/js-test-post.js"></script>
  92 </body>
  93 </html>