dom/canvas/test/webgl-conf/checkout/conformance/attribs/gl-bindAttribLocation-nonexistent-attribute.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 <!DOCTYPE html>
   7 <html>
   8 <head>
   9 <meta charset="utf-8">
  10 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  11 <script src="../../js/js-test-pre.js"></script>
  12 <script src="../../js/webgl-test-utils.js"></script>
  13 <title>bindAttribLocation with nonexistent attribute name</title>
  14 </head>
  15 <body>
  16 <div id="description"></div>
  17 <div id="console"></div>
  18 <canvas id="canvas" width="8" height="8"></canvas>
  19 <script id="vertexShader" type="text/something-not-javascript">
  20 precision highp float;
  21 attribute vec4 attr;
  22 void main() {
  23     gl_Position = vec4(attr);
  24 }
  25 </script>
  26 <script>
  27 "use strict";
  28 description("This test verifies that calling bindAttribLocation with a non-existent attribute location is fine.");
  29
  30 // OpenGL ES 2.0.25 section 2.10 page 34.
  31
  32 var wtu = WebGLTestUtils;
  33 var canvas = document.getElementById("canvas");
  34 var gl = wtu.create3DContext(canvas);
  35 var fragmentShader = wtu.loadShader(gl, wtu.simpleColorFragmentShader, gl.FRAGMENT_SHADER);
  36 var vertexShader = wtu.loadShaderFromScript(gl, 'vertexShader', gl.VERTEX_SHADER);
  37 assertMsg(vertexShader != null, "Vertex shader compiled successfully.");
  38
  39 var checkAttribLocation = function(program, expectedLocation) {
  40     var location = gl.getAttribLocation(program, 'attr');
  41     if (location != expectedLocation) {
  42         testFailed('Unexpected location for attr: ' + location);
  43     } else {
  44         testPassed('Location of attr is: ' + location);
  45     }
  46 }
  47
  48 var testProgramNonExistentAttributeBound = function() {
  49     var program = gl.createProgram();
  50     gl.bindAttribLocation(program, 0, 'attr');
  51     gl.bindAttribLocation(program, 1, 'bogus_attr');
  52     gl.attachShader(program, vertexShader);
  53     gl.attachShader(program, fragmentShader);
  54     gl.linkProgram(program);
  55     var linkStatus = gl.getProgramParameter(program, gl.LINK_STATUS);
  56     expectTrue(linkStatus, "Link should succeed even if a non-existent attribute is bound.");
  57     if (linkStatus) {
  58         checkAttribLocation(program, 0);
  59     }
  60 };
  61 var testProgramNonExistentAttributeOverlap = function() {
  62     var program = gl.createProgram();
  63     gl.bindAttribLocation(program, 1, 'attr');
  64     gl.bindAttribLocation(program, 1, 'bogus_attr');
  65     gl.attachShader(program, vertexShader);
  66     gl.attachShader(program, fragmentShader);
  67     gl.linkProgram(program);
  68     var linkStatus = gl.getProgramParameter(program, gl.LINK_STATUS);
  69     expectTrue(linkStatus, "Link should succeed even if a non-existent attribute is bound to the same location as an attribute that's present in the shader text.");
  70     if (linkStatus) {
  71         checkAttribLocation(program, 1);
  72     }
  73 };
  74
  75 testProgramNonExistentAttributeBound();
  76 testProgramNonExistentAttributeOverlap();
  77
  78 var successfullyParsed = true;
  79 </script>
  80 <script src="../../js/js-test-post.js"></script>
  81 </body>
  82 </html>