dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/shader-with-too-many-uniforms.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>WebGL GLSL Conformance Tests</title>
  12 <link rel="stylesheet" href="../../../resources/js-test-style.css"/>
  13 <link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/>
  14 <script src="../../../js/js-test-pre.js"></script>
  15 <script src="../../../js/webgl-test-utils.js"></script>
  16 <script src="../../../js/glsl-conformance-test.js"></script>
  17 </head>
  18 <body>
  19 <div id="description"></div>
  20 <div id="console"></div>
  21 <script id="vshader" type="x-shader/x-vertex">
  22 attribute vec4 a_position;
  23 void main()
  24 {
  25     gl_Position = a_position;
  26 }
  27 </script>
  28 <script id="vshader-max" type="x-shader/x-vertex">
  29 attribute vec4 a_position;
  30 uniform vec4 u_color[$(maxUniformVectors)];
  31 void main()
  32 {
  33     vec4 v = vec4(0, 0, 0, 0);
  34     for (int i = 0; i < $(maxUniformVectors); ++i) {
  35         v = v + vec4(u_color[i]);
  36     }
  37     gl_Position = a_position + v;
  38 }
  39 </script>
  40 <script id="fshader" type="x-shader/x-fragment">
  41 precision mediump float;
  42 void main()
  43 {
  44     gl_FragColor = vec4(0, 1, 0, 1);
  45 }
  46 </script>
  47 <script id="fshader-max" type="x-shader/x-fragment">
  48 precision mediump float;
  49 uniform vec4 u_color[$(maxUniformVectors)];
  50 void main()
  51 {
  52     vec4 v = vec4(0, 0, 0, 0);
  53     for (int i = 0; i < $(maxUniformVectors); ++i) {
  54         v = v + vec4(u_color[i]);
  55     }
  56     gl_FragColor = v;
  57 }
  58 </script>
  59 <script>
  60 "use strict";
  61 description("checks shader with too many uniforms fails");
  62
  63 var wtu = WebGLTestUtils;
  64 var gl = wtu.create3DContext();
  65 var maxFragmentUniformVectors = gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_VECTORS);
  66 var maxVertexUniformVectors = gl.getParameter(gl.MAX_VERTEX_UNIFORM_VECTORS);
  67
  68 // Up to 2 uniform vector registers may be spent for literal constants in
  69 // vshader-max or fshader-max code. One vector row is used for the vec4, and
  70 // another may be used for integer constants that are allowed to be treated
  71 // internally as floats and are packable to the space of one row. This is
  72 // according to the GLSL ES variable packing algorithm detailed in Section 7 of
  73 // Appendix A of the GLSL ES Specification 10.0.17.
  74 var maxVectorStorageUsedForLiterals = 2;
  75
  76 var tests = [
  77  { desc: "using all uniforms in vertex shader should succeed",
  78    maxUniformVectors: maxVertexUniformVectors - maxVectorStorageUsedForLiterals,
  79    vShader: "vshader-max",
  80    fShader: "fshader",
  81    success: true,
  82  },
  83  { desc: "using too many uniforms in vertex shader should fail",
  84    maxUniformVectors: maxVertexUniformVectors + 1,
  85    vShader: "vshader-max",
  86    fShader: "fshader",
  87    color: [0, 1, 0, 1],
  88    success: false,
  89  },
  90  { desc: "using all uniforms in fragment shader should succeed",
  91    maxUniformVectors: maxFragmentUniformVectors - maxVectorStorageUsedForLiterals,
  92    vShader: "vshader",
  93    fShader: "fshader-max",
  94    success: true,
  95  },
  96  { desc: "using too many uniforms in fragment shader should fail",
  97    maxUniformVectors: maxFragmentUniformVectors + 1,
  98    vShader: "vshader",
  99    fShader: "fshader-max",
 100    color: [0, 1, 0, 1],
 101    success: false,
 102  },
 103 ];
 104
 105 var glslTests = [];
 106
 107 for (var ii = 0; ii < tests.length; ++ii) {
 108   var test = tests[ii];
 109   var vSrc = wtu.replaceParams(wtu.getScript(test.vShader), test);
 110   var fSrc = wtu.replaceParams(wtu.getScript(test.fShader), test);
 111   glslTests.push({
 112     vShaderSource: vSrc,
 113     fShaderSource: fSrc,
 114     linkSuccess: test.success,
 115     passMsg: 'shader ' + test.desc,
 116   });
 117 }
 118
 119 GLSLConformanceTester.runTests(glslTests);
 120 var successfullyParsed = true;
 121 </script>
 122 </body>
 123 </html>