dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/attrib-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 attrib 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 attribute 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 attrib location is exactly 256 characters.
  24 attribute vec4 vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456;
  25
  26 void main()
  27 {
  28     gl_Position = vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456;
  29 }
  30 </script>
  31 <script id="badVertexShader" type="x-shader/x-vertex">
  32 // A vertex shader where the needed attrib location is 257 characters.
  33 attribute vec4 vPosition01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567;
  34
  35 void main()
  36 {
  37     gl_Position = vPosition01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567;
  38 }
  39 </script>
  40 <script id="fragmentShader" type="x-shader/x-fragment">
  41 precision mediump float;
  42
  43 void main() {
  44     gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
  45 }
  46 </script>
  47 <script>
  48 "use strict";
  49 description("test attrib location length limit");
  50
  51 var wtu = WebGLTestUtils;
  52 var gl = wtu.create3DContext("example");
  53
  54 debug("Test attrib location underneath the length limit");
  55 var program = wtu.loadProgramFromScript(gl, "goodVertexShader", "fragmentShader");
  56 shouldBe('gl.getProgramParameter(program, gl.LINK_STATUS)', 'true');
  57 var attrib256Name = "vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456";
  58 gl.bindAttribLocation(program, 0, attrib256Name);
  59 wtu.glErrorShouldBe(gl, gl.NONE);
  60 var attribLoc = gl.getAttribLocation(program, attrib256Name);
  61 if (attribLoc == -1) {
  62     testFailed("attrib location was -1, should not be");
  63 } else {
  64     testPassed("attrib location should not be -1");
  65 }
  66 wtu.glErrorShouldBe(gl, gl.NONE);
  67
  68 debug("Test attrib location over the length limit");
  69 var attrib257Name = attrib256Name + "7";
  70
  71 debug("Shader compilation or link should fail");
  72 shouldBe('wtu.loadProgramFromScriptExpectError(gl, "badVertexShader", "fragmentShader")', 'null');
  73 wtu.glErrorShouldBe(gl, gl.NONE);
  74
  75 debug("Attempt to bind too-long attrib location should produce error");
  76 program = gl.createProgram();
  77 gl.bindAttribLocation(program, 0, attrib257Name);
  78 wtu.glErrorShouldBe(gl, gl.INVALID_VALUE);
  79
  80 debug("Attempt to fetch too-long attrib location should produce error");
  81 program = wtu.loadStandardProgram(gl);
  82 shouldBe('gl.getAttribLocation(program, attrib257Name)', '-1');
  83 wtu.glErrorShouldBe(gl, gl.INVALID_VALUE);
  84
  85 var successfullyParsed = true;
  86 </script>
  87 <script src="../../../js/js-test-post.js"></script>
  88 </body>
  89 </html>