dom/canvas/test/webgl-conf/checkout/conformance/uniforms/gl-uniform-unused-array-elements-get-truncated.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 uniform unused array elements get truncated Conformance 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 </head>
  16 <body>
  17 <div id="description"></div>
  18 <div id="console"></div>
  19 <canvas id="example" width="2" height="2"> </canvas>
  20 <script id="vshader" type="x-shader/x-vertex">
  21     attribute vec4 a_position;
  22     void main()
  23     {
  24         gl_Position = a_position;
  25     }
  26 </script>
  27 <script id="fshader-max" type="x-shader/x-fragment">
  28     precision mediump float;
  29     uniform vec4 colora[$(numUniformVectors)];
  30     void main()
  31     {
  32         gl_FragColor = vec4(colora[$(usedUniformVector)]);
  33     }
  34 </script>
  35 <script>
  36 "use strict";
  37 description();
  38 debug("");
  39 var wtu = WebGLTestUtils;
  40 var gl = wtu.create3DContext("example");
  41 var vSrc = wtu.getScript("vshader");
  42 var uniforms;
  43 // This test is to test drivers the have bugs related to optimizing
  44 // an array of uniforms when only 1 of those uniforms is used.
  45 debug("");
  46 var maxUniformVectors = gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_VECTORS);
  47 var tests = [
  48  { desc: "using 5th element",
  49    maxUniformVectors: maxUniformVectors,
  50    numUniformVectors: maxUniformVectors * 2,
  51    usedUniformVector: 5,
  52    shader: "fshader-max",
  53    color: [0, 1, 0, 1],
  54    arrayName: "colora",
  55  },
  56 ];
  57
  58 // According to the spec unused array elements must be truncated.
  59 var requiredUniformLocationsExist;
  60 function testUniformIssues(testIndex) {
  61   var test = tests[testIndex];
  62   debug("");
  63   debug(test.desc);
  64   var fSrc = test.source;
  65   if (!fSrc) {
  66     fSrc = wtu.replaceParams(wtu.getScript(test.shader), test);
  67   }
  68
  69   var consoleElem = document.getElementById("console");
  70   wtu.addShaderSource(
  71       consoleElem, "vertex shader", vSrc);
  72   wtu.addShaderSource(
  73       consoleElem, "fragment shader", fSrc);
  74
  75   var program = wtu.loadProgram(gl, vSrc, fSrc);
  76   gl.useProgram(program);
  77   uniforms = wtu.getUniformMap(gl, program);
  78   shouldBe('uniforms["' + test.arrayName + '[0]"].size', (test.usedUniformVector + 1).toString());
  79
  80   requiredUniformLocationsExist = true;
  81   for (var ii = 0; ii <= test.usedUniformVector + 1; ++ii) {
  82     var name = test.arrayName + "[" + ii + "]";
  83     var colorLocation = gl.getUniformLocation(program, name);
  84     if (ii <= test.usedUniformVector) {
  85       if (!colorLocation) {
  86         requiredUniformLocationsExist = false
  87       }
  88     } else {
  89       if (colorLocation) {
  90         testFailed("uniform array was not truncated as specified in OpenGL ES 2.0.25 section 2.10.4");
  91       }
  92     }
  93   }
  94   shouldBeTrue("requiredUniformLocationsExist");
  95 }
  96
  97 var testIndex = 0;
  98 function runNextTest() {
  99   testUniformIssues(testIndex++);
 100   if (testIndex < tests.length) {
 101     setTimeout(runNextTest, 0);
 102   } else {
 103     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
 104     debug("");
 105     finishTest();
 106   }
 107 }
 108 runNextTest();
 109
 110 var successfullyParsed = true;
 111
 112 </script>
 113 </body>
 114 </html>