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more-than-65536-indices.html (3850B)


      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 More than 65536 indices.</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 <canvas id="example" width="1" height="1" style="width: 40px; height: 40px;"></canvas>
     18 <div id="description"></div>
     19 <div id="console"></div>
     20 <script id="vs" type="text/something-not-javascript">
     21 attribute vec4 vPosition;
     22 attribute vec4 vColor;
     23 varying vec4 color;
     24 void main() {
     25    gl_Position = vPosition;
     26    gl_PointSize = 1.0;
     27    color = vColor;
     28 }
     29 </script>
     30 <script id="fs" type="text/something-not-javascript">
     31 precision mediump float;
     32 varying vec4 color;
     33 void main() {
     34    gl_FragColor = color;
     35 }
     36 </script>
     37 <script>
     38 "use strict";
     39 description("checks that rendering with more than 65536 indices works.");
     40 var wtu = WebGLTestUtils;
     41 var gl = wtu.create3DContext("example");
     42 var program = wtu.setupProgram(gl, ["vs", "fs"], ["vPosition", "vColor"]);
     43 var bufferObjects = wtu.setupUnitQuad(gl, 0, 1);
     44 
     45 gl.bindBuffer(gl.ARRAY_BUFFER, bufferObjects[0]);
     46 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
     47      -1,  1,
     48       1,  1,
     49      -1, -1,
     50       1, -1,
     51      -1,  1,
     52       1,  1,
     53      -1, -1,
     54       1, -1]), gl.STATIC_DRAW);
     55 gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
     56 gl.bindBuffer(gl.ARRAY_BUFFER, bufferObjects[1]);
     57 gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array([
     58      255, 0, 0, 255,
     59      255, 0, 0, 255,
     60      255, 0, 0, 255,
     61      255, 0, 0, 255,
     62      0, 255, 0, 255,
     63      0, 255, 0, 255,
     64      0, 255, 0, 255,
     65      0, 255, 0, 255]), gl.STATIC_DRAW);
     66 gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, 0);
     67 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after program setup");
     68 
     69 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating texture");
     70 var numQuads = Math.floor(65536 / 6) + 4;
     71 var numPoints = numQuads * 6;
     72 debug("numQuads: " + numQuads);
     73 debug("numPoints: " + numPoints);
     74 var indexBuf = new ArrayBuffer(numPoints);
     75 var indices = new Uint8Array(indexBuf);
     76 var indexBuffer = gl.createBuffer();
     77 gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
     78 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting up indices");
     79 
     80 var modes = [
     81  {mode: 'POINTS',         offsets: [0, 1, 2, 3, 2, 1], skip: 0},
     82  {mode: 'LINES',          offsets: [0, 1, 2, 3, 2, 1], skip: 0},
     83  {mode: 'LINE_LOOP',      offsets: [0, 1, 2, 3, 2, 1], skip: 1},
     84  {mode: 'LINE_STRIP',     offsets: [0, 1, 2, 3, 2, 1], skip: 0},
     85  {mode: 'TRIANGLES',      offsets: [0, 1, 2, 3, 2, 1], skip: 0},
     86  {mode: 'TRIANGLE_STRIP', offsets: [0, 1, 2, 3, 2, 1], skip: 0},
     87  {mode: 'TRIANGLE_FAN',   offsets: [0, 1, 3, 2, 2, 1], skip: 1}
     88 ];
     89 
     90 for (var mm = 0; mm < modes.length; ++mm) {
     91  var modeInfo = modes[mm];
     92  var mode = modeInfo.mode;
     93  var offsets = modeInfo.offsets;
     94  var skip = modeInfo.skip;
     95 
     96  for (var ii = 0; ii < numQuads; ++ii) {
     97    var offset = ii * 6;
     98    var quad = (ii == 0 || ii == (numQuads - 1)) ? 4 : 0;
     99    for (var jj = 0; jj < 6; ++jj) {
    100      indices[offset + jj] = quad + offsets[jj];
    101    }
    102  }
    103  gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
    104 
    105  debug("");
    106  debug("testing: " + mode);
    107  // Draw without last 6 points.
    108  gl.drawElements(gl[mode], numPoints - (skip + 1) * 6, gl.UNSIGNED_BYTE, skip * 6);
    109  wtu.checkCanvas(gl, [255, 0, 0, 255], "Should be red.");
    110  // Draw with last 6 points.
    111  gl.drawElements(gl[mode], numPoints, gl.UNSIGNED_BYTE, 0);
    112  wtu.checkCanvas(gl, [0, 255, 0, 255], "Should be green.");
    113 }
    114 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
    115 
    116 var successfullyParsed = true;
    117 </script>
    118 <script src="../../js/js-test-post.js"></script>
    119 
    120 </body>
    121 </html>