dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/forward-declaration.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.
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   6
   7 <!DOCTYPE html>
   8 <html>
   9 <head>
  10 <meta charset="utf-8">
  11 <title>GLSL 3.00 forward declaration 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="vertexShaderForwardDecl" type="x-shader/x-vertex">#version 300 es
  21 precision mediump float;
  22
  23 // Forward declaration. Breaks on Pixel C due to flattening of
  24 // precision qualifiers. It seems the GLSL compiler can't handle the
  25 // precision qualifier on the return value.
  26 float identity(float val);
  27
  28 float identity(float val) {
  29   return val;
  30 }
  31
  32 void main(void) {
  33     gl_Position = vec4(identity(1.0), 0.0, 0.0, 1.0);
  34 }
  35 </script>
  36 <script id="vertexShader" type="x-shader/x-vertex">#version 300 es
  37 void main(void) {
  38     gl_Position = vec4(1.0, 0.0, 0.0, 1.0);
  39 }
  40 </script>
  41 <script id="fragmentShader" type="x-shader/x-fragment">#version 300 es
  42 precision mediump float;
  43
  44 out vec4 my_FragColor;
  45 void main(void) {
  46   my_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
  47 }
  48 </script>
  49 <script id="fragmentShaderForwardDecl" type="x-shader/x-fragment">#version 300 es
  50 precision mediump float;
  51
  52 // Forward declaration. Breaks on Pixel C due to flattening of
  53 // precision qualifiers. It seems the GLSL compiler can't handle the
  54 // precision qualifier on the return value.
  55 float identity(float val);
  56
  57 float identity(float val) {
  58   return val;
  59 }
  60
  61 out vec4 my_FragColor;
  62 void main(void) {
  63   my_FragColor = vec4(0.0, identity(1.0), 0.0, 1.0);
  64 }
  65 </script>
  66 <script type="application/javascript">
  67 "use strict";
  68 description("Forward declarations of functions should succeed.");
  69
  70 GLSLConformanceTester.runTests([
  71   {
  72     vShaderId: "vertexShaderForwardDecl",
  73     vShaderSuccess: true,
  74     fShaderId: "fragmentShader",
  75     fShaderSuccess: true,
  76     linkSuccess: true,
  77     passMsg: "vertex shader with forward declaration must pass",
  78   },
  79   {
  80     vShaderId: "vertexShader",
  81     vShaderSuccess: true,
  82     fShaderId: "fragmentShaderForwardDecl",
  83     fShaderSuccess: true,
  84     linkSuccess: true,
  85     passMsg: "fragment shader with forward declaration must pass",
  86   },
  87 ], 2);
  88 </script>
  89 </body>
  90 </html>