dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-with-resized-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 <canvas id="example" width="1" height="1"></canvas>
  17 <div id="description"></div>
  18 <div id="console"></div>
  19
  20 <script id="vs" type="x-shader/x-vertex">
  21 attribute vec4 vPosition;
  22 attribute vec4 vColor;
  23 varying vec4 color;
  24 void main() {
  25     gl_Position = vPosition;
  26     color = vColor;
  27 }
  28 </script>
  29 <script id="fs" type="x-shader/x-fragment">
  30 precision mediump float;
  31 varying vec4 color;
  32 void main() {
  33   gl_FragColor = color;
  34 }
  35 </script>
  36 <script>
  37 "use strict";
  38 description('Test that updating the size of a vertex buffer is properly noticed by the WebGL implementation.')
  39
  40 var wtu = WebGLTestUtils;
  41 var gl = wtu.create3DContext("example");
  42 var program = wtu.setupProgram(gl, ["vs", "fs"], ["vPosition", "vColor"]);
  43 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after initialization");
  44
  45 var vertexObject = gl.createBuffer();
  46 gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
  47 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(
  48     [-1,1,0, 1,1,0, -1,-1,0,
  49      -1,-1,0, 1,1,0, 1,-1,0]), gl.STATIC_DRAW);
  50 gl.enableVertexAttribArray(0);
  51 gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
  52 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after vertex setup");
  53
  54 var texCoordObject = gl.createBuffer();
  55 gl.bindBuffer(gl.ARRAY_BUFFER, texCoordObject);
  56 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(
  57     [0,0, 1,0, 0,1,
  58      0,1, 1,0, 1,1]), gl.STATIC_DRAW);
  59 gl.enableVertexAttribArray(1);
  60 gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
  61 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture coord setup");
  62
  63 // Now resize these buffers because we want to change what we're drawing.
  64 gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
  65 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
  66     -1,1,0, 1,1,0, -1,-1,0, 1,-1,0,
  67     -1,1,0, 1,1,0, -1,-1,0, 1,-1,0]), gl.STATIC_DRAW);
  68 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after vertex redefinition");
  69 gl.bindBuffer(gl.ARRAY_BUFFER, texCoordObject);
  70 gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array([
  71     255, 0, 0, 255,
  72     255, 0, 0, 255,
  73     255, 0, 0, 255,
  74     255, 0, 0, 255,
  75     0, 255, 0, 255,
  76     0, 255, 0, 255,
  77     0, 255, 0, 255,
  78     0, 255, 0, 255]), gl.STATIC_DRAW);
  79 gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, false, 0, 0);
  80 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture coordinate / color redefinition");
  81
  82 var numQuads = 2;
  83 var indices = new Uint8Array(numQuads * 6);
  84 for (var ii = 0; ii < numQuads; ++ii) {
  85     var offset = ii * 6;
  86     var quad = (ii == (numQuads - 1)) ? 4 : 0;
  87     indices[offset + 0] = quad + 0;
  88     indices[offset + 1] = quad + 1;
  89     indices[offset + 2] = quad + 2;
  90     indices[offset + 3] = quad + 2;
  91     indices[offset + 4] = quad + 1;
  92     indices[offset + 5] = quad + 3;
  93 }
  94 var indexObject = gl.createBuffer();
  95 gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexObject);
  96 gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
  97 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting up indices");
  98 gl.drawElements(gl.TRIANGLES, numQuads * 6, gl.UNSIGNED_BYTE, 0);
  99 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
 100
 101 debug("")
 102 var successfullyParsed = true;
 103 </script>
 104
 105 <script src="../../js/js-test-post.js"></script>
 106 </body>
 107 </html>