dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/uniform-location-length-limits.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <meta charset="utf-8">
   5 <!--
   6 Copyright (c) 2019 The Khronos Group Inc.
   7 Use of this source code is governed by an MIT-style license that can be
   8 found in the LICENSE.txt file.
   9 -->
  10 <title>WebGL uniform location length 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 </head>
  16 <body>
  17 <canvas id="example" width="50" height="50">
  18 There is supposed to be an example drawing here, but it's not important.
  19 </canvas>
  20 <div id="description">Verify limits on the lengths of uniform locations per WebGL spec, "Maximum Uniform and Attribute Location Lengths".</div>
  21 <div id="console"></div>
  22 <script id="goodVertexShader" type="x-shader/x-vertex">
  23 // A vertex shader where the needed uniform location is exactly 256 characters.
  24 struct Nesting2 {
  25     vec4 identifier62CharactersLong_01234567890123456789012345678901234;
  26 };
  27
  28 struct Nesting1 {
  29     Nesting2 identifier64CharactersLong_0123456789012345678901234567890123456;
  30 };
  31
  32 uniform Nesting1 identifier128CharactersLong_0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789;
  33
  34 void main() {
  35     gl_Position = identifier128CharactersLong_0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.identifier64CharactersLong_0123456789012345678901234567890123456.identifier62CharactersLong_01234567890123456789012345678901234;
  36 }
  37 </script>
  38 <script id="badVertexShader" type="x-shader/x-vertex">
  39 // A vertex shader where the needed uniform location is 257 characters.
  40 struct Nesting2 {
  41     vec4 identifier63CharactersLong_012345678901234567890123456789012345;
  42 };
  43
  44 struct Nesting1 {
  45     Nesting2 identifier64CharactersLong_0123456789012345678901234567890123456;
  46 };
  47
  48 uniform Nesting1 identifier128CharactersLong_0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789;
  49
  50 void main() {
  51     Nesting2 temp = identifier128CharactersLong_0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.identifier64CharactersLong_0123456789012345678901234567890123456;
  52     gl_Position = temp.identifier63CharactersLong_012345678901234567890123456789012345;
  53 }
  54 </script>
  55 <script id="fragmentShader" type="x-shader/x-fragment">
  56 precision mediump float;
  57
  58 void main() {
  59     gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
  60 }
  61 </script>
  62 <script>
  63 "use strict";
  64 var wtu = WebGLTestUtils;
  65 var gl = wtu.create3DContext("example");
  66
  67 debug("Test uniform location underneath the length limit");
  68 var program = wtu.loadProgramFromScript(gl, "goodVertexShader", "fragmentShader");
  69 shouldBe('gl.getProgramParameter(program, gl.LINK_STATUS)', 'true');
  70 var uniformLoc = gl.getUniformLocation(program, "identifier128CharactersLong_0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.identifier64CharactersLong_0123456789012345678901234567890123456.identifier62CharactersLong_01234567890123456789012345678901234");
  71 shouldBeNonNull('uniformLoc');
  72 wtu.glErrorShouldBe(gl, gl.NONE);
  73
  74 debug("Test uniform location over the length limit");
  75 program = wtu.loadProgramFromScript(gl, "badVertexShader", "fragmentShader");
  76 wtu.glErrorShouldBe(gl, gl.NONE);
  77 shouldBe('gl.getProgramParameter(program, gl.LINK_STATUS)', 'true');
  78 var uniformLoc = gl.getUniformLocation(program, "identifier128CharactersLong_0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.identifier64CharactersLong_0123456789012345678901234567890123456.identifier63CharactersLong_012345678901234567890123456789012345");
  79 wtu.glErrorShouldBe(gl, gl.INVALID_VALUE);
  80 shouldBeNull('uniformLoc');
  81
  82 var successfullyParsed = true;
  83 </script>
  84 <script src="../../../js/js-test-post.js"></script>
  85 </body>
  86 </html>