dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-large-buffer.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 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  12 <script src="../../js/js-test-pre.js"></script>
  13 <script src="../../js/webgl-test-utils.js"></script>
  14 </head>
  15 <body>
  16 <div id="description"></div>
  17 <div id="console"></div>
  18
  19 <script>
  20 "use strict";
  21 description('Tests that index validation for drawElements works with large attribute buffers');
  22
  23 var wtu = WebGLTestUtils;
  24 var context = wtu.create3DContext();
  25 var program = wtu.loadStandardProgram(context);
  26
  27 context.useProgram(program);
  28
  29 // Create a small index buffer.
  30 var indexObject = context.createBuffer();
  31 context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, indexObject);
  32 var indexArray = new Uint16Array([0, 1, 2]);
  33 context.bufferData(context.ELEMENT_ARRAY_BUFFER, indexArray, context.STATIC_DRAW);
  34
  35 // Create a large attribute buffer.
  36 var vertexObject = context.createBuffer();
  37 context.enableVertexAttribArray(0);
  38 context.bindBuffer(context.ARRAY_BUFFER, vertexObject);
  39 context.bufferData(context.ARRAY_BUFFER, new Float32Array(3 * 65536), context.STATIC_DRAW);
  40 context.vertexAttribPointer(0, 3, context.FLOAT, false, 0, 0);
  41
  42 debug("Test large attribute buffer")
  43 wtu.shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_SHORT, 0)");
  44
  45 // Enlarge the attribute buffer slightly.
  46 debug("Test even larger attribute buffer")
  47 context.bufferData(context.ARRAY_BUFFER, new Float32Array(3 * 65536 + 3), context.STATIC_DRAW);
  48 wtu.shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_SHORT, 0)");
  49
  50 debug("")
  51 var successfullyParsed = true;
  52 </script>
  53
  54 <script src="../../js/js-test-post.js"></script>
  55 </body>
  56 </html>