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shaders-with-constant-expression-loop-conditions.html (3792B)

      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 <!DOCTYPE html>
      7 <html>
      8 <head>
      9 <meta charset="utf-8">
     10 <title>WebGL GLSL Conformance Tests</title>
     11 <link rel="stylesheet" href="../../../resources/js-test-style.css" />
     12 <link rel="stylesheet" href="../../../resources/glsl-feature-tests.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="vertexShaderLiteralLoopCondition" type="text/something-not-javascript">
     21 attribute vec4 a_position;
     22 void main()
     23 {
     24    for (int i = 0; i < 5 + 5; i++) { }
     25    gl_Position = a_position;
     26 }
     27 </script>
     28 <script id="fragmentShaderLiteralLoopCondition" type="text/something-not-javascript">
     29 void main()
     30 {
     31    for (int i = 0; i < 5 + 5; i++) { }
     32    gl_FragColor = vec4(1.0);
     33 }
     34 </script>
     35 <script id="vertexShaderConstVarLoopCondition" type="text/something-not-javascript">
     36 attribute vec4 a_position;
     37 void main()
     38 {
     39    // Explicitly constant variables can be part of a constant expression
     40    const int constVar = 5;
     41    for (int i = 0; i < 5 + constVar; i++) { }
     42    gl_Position = a_position;
     43 }
     44 </script>
     45 <script id="fragmentShaderConstVarLoopCondition" type="text/something-not-javascript">
     46 void main()
     47 {
     48    // Explicitly constant variables can be part of a constant expression
     49    const int constVar = 5;
     50    for (int i = 0; i < constVar + 5; i++) { }
     51    gl_FragColor = vec4(1.0);
     52 }
     53 </script>
     54 <script id="vertexShaderNonConstVarLoopCondition" type="text/something-not-javascript">
     55 attribute vec4 a_position;
     56 void main()
     57 {
     58    // Despite assigning a constant and not modifying it, nonConstVar is not semantically a constant expression
     59    int nonConstVar = 10;
     60    for (int i = 0; i < nonConstVar; i++) { }
     61    gl_Position = a_position;
     62 }
     63 </script>
     64 <script id="fragmentShaderNonConstVarLoopCondition" type="text/something-not-javascript">
     65 void main()
     66 {
     67    // Despite assigning a constant and not modifying it, nonConstVar is not semantically a constant expression
     68    int nonConstVar = 10;
     69    for (int i = 0; i < nonConstVar; i++) { }
     70    gl_FragColor = vec4(1.0);
     71 }
     72 </script>
     73 <script>
     74 "use strict";
     75 var wtu = WebGLTestUtils;
     76 
     77 var tests = [];
     78 tests.push({
     79    vShaderSource: wtu.getScript("vertexShaderLiteralLoopCondition"),
     80    vShaderSuccess: true,
     81    fShaderSource: wtu.getScript("fragmentShaderLiteralLoopCondition"),
     82    fShaderSuccess: true,
     83    linkSuccess: true,
     84    passMsg: "Shaders with literals in the loop condition should compile and link.",
     85 });
     86 tests.push({
     87    vShaderSource: wtu.getScript("vertexShaderConstVarLoopCondition"),
     88    vShaderSuccess: true,
     89    fShaderSource: wtu.getScript("fragmentShaderConstVarLoopCondition"),
     90    fShaderSuccess: true,
     91    linkSuccess: true,
     92    passMsg: "Shaders with constant variables in the loop condition should compile and link.",
     93 });
     94 tests.push({
     95    vShaderSource: wtu.getScript("vertexShaderNonConstVarLoopCondition"),
     96    vShaderSuccess: false,
     97    fShaderSource: wtu.getScript("fragmentShaderLiteralLoopCondition"),
     98    fShaderSuccess: true,
     99    linkSuccess: false,
    100    passMsg: "Vertex shader with non-const variable in the loop condition should fail.",
    101 });
    102 tests.push({
    103    vShaderSource: wtu.getScript("vertexShaderLiteralLoopCondition"),
    104    vShaderSuccess: true,
    105    fShaderSource: wtu.getScript("fragmentShaderNonConstVarLoopCondition"),
    106    fShaderSuccess: false,
    107    linkSuccess: false,
    108    passMsg: "Fragment shader with non-const variable in the loop condition should fail.",
    109 });
    110 
    111 GLSLConformanceTester.runTests(tests);
    112 var successfullyParsed = true;
    113 </script>
    114 </body>
    115 </html>