dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/vector-dynamic-indexing-nv-driver-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 dynamic vector and matrix indexing test</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 <script src="../../js/glsl-conformance-test.js"></script>
  16 </head>
  17 <body>
  18 <div id="description"></div>
  19 <div id="console"></div>
  20 <script id="fshaderLValueVectorBeingIndexedHasSideEffects" type="x-shader/x-fragment">#version 300 es
  21 precision mediump float;
  22
  23 out vec4 my_FragColor;
  24
  25 uniform int u_zero;
  26
  27 int sideEffectCounter = 0;
  28
  29 int funcWithSideEffects() {
  30     sideEffectCounter++;
  31     return 1;
  32 }
  33
  34 void main() {
  35     vec4 V[2];
  36     V[0] = vec4(1.0, 2.0, 3.0, 4.0);
  37     V[1] = vec4(5.0, 6.0, 7.0, 8.0);
  38     // In case this is broken down to two expressions where one reads V[funcWithSideEffects()]
  39     // and another writes it, it needs to be made sure that funcWithSideEffects() only gets called once.
  40     V[funcWithSideEffects()][u_zero + 1]++;
  41     vec4 expectedV0 = vec4(1.0, 2.0, 3.0, 4.0);
  42     vec4 expectedV1 = vec4(5.0, 7.0, 7.0, 8.0);
  43     float f = 1.0 - distance(V[0], expectedV0) - distance(V[1], expectedV1);
  44     if (sideEffectCounter != 1) {
  45         f = 0.0;
  46     }
  47     my_FragColor = vec4(1.0 - f, f, 0.0, 1.0);
  48 }
  49 </script>
  50 <script type="application/javascript">
  51 "use strict";
  52 description("Dynamic indexing of vectors and matrices should work.");
  53
  54 debug("This test exposes a NVidia driver bug on Linux");
  55
  56 GLSLConformanceTester.runRenderTests([
  57 {
  58   fShaderId: 'fshaderLValueVectorBeingIndexedHasSideEffects',
  59   fShaderSuccess: true,
  60   linkSuccess: true,
  61   passMsg: 'Index a vector expression that itself has side effects, in an l-value'
  62 },
  63 ], 2);
  64 </script>
  65 </body>
  66 </html>
  67