dom/canvas/test/webgl-conf/checkout/conformance2/transform_feedback/non-existent-varying.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 Transform Feedback Conformance Tests</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 <script id="vshader" type="x-shader/x-vertex">#version 300 es
  20 in vec3 position;
  21 void main()
  22 {
  23     gl_Position = vec4(position, 1);
  24 }
  25 </script>
  26 <script id="fshader" type="x-shader/x-fragment">#version 300 es
  27 precision mediump float;
  28 out vec4 color;
  29 void main()
  30 {
  31     color = vec4(0);
  32 }
  33 </script>
  34 <script>
  35 "use strict";
  36 description("Test that specifying non-existent varyings for transform feedback causes the program to fail to link. This test covers an ANGLE bug.");
  37
  38 // Spec: GLES 3.0.5 section 2.12.8:
  39 // "A program will fail to link if:"
  40 // "any variable name specified in the varyings array is not declared as an output in the vertex shader;"
  41
  42 debug("");
  43
  44 var wtu = WebGLTestUtils;
  45 var gl = wtu.create3DContext(undefined, undefined, 2);
  46
  47 if (!gl) {
  48     testFailed("WebGL context does not exist");
  49 } else {
  50     runTest("bogus");
  51     runTest("gl_Bogus");
  52 }
  53
  54 function runTest(nonExistentVaryingName) {
  55     var program = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"],
  56         [nonExistentVaryingName], gl.INTERLEAVED_ATTRIBS,
  57         ["position"]);
  58     var msg = "Program should fail to link when a nonexistent varying '" + nonExistentVaryingName + "' is specified for transform feedback.";
  59     if (program) {
  60         testFailed(msg);
  61     } else {
  62         testPassed(msg);
  63     }
  64 }
  65
  66 var successfullyParsed = true;
  67 </script>
  68 <script src="../../js/js-test-post.js"></script>
  69 </body>
  70 </html>