dom/canvas/test/webgl-conf/checkout/conformance/textures/misc/gl-pixelstorei.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 pixelStorei Test</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="50" height="50"></canvas>
  18 <canvas id="2d00" width="50" height="50"></canvas>
  19 <canvas id="2d01" width="50" height="50"></canvas>
  20 <canvas id="2d02" width="50" height="50"></canvas>
  21 <canvas id="2d03" width="50" height="50"></canvas>
  22 <div id="description"></div>
  23 <div id="console"></div>
  24 <script id="vshader" type="x-shader/x-vertex">
  25 attribute vec4 vPosition;
  26 void main() {
  27   gl_Position = vPosition;
  28 }
  29 </script>
  30
  31 <script id="fshader" type="x-shader/x-fragment">
  32 void main() {
  33   gl_FragColor = vec4(1.0,0.0,0.0,1.0);
  34 }
  35 </script>
  36
  37 <script>
  38 "use strict";
  39 function init() {
  40   description("This test checks that drawImage and readPixels are not effected by gl.Pixelstorei(gl.PACK_ALIGNMENT) and visa versa");
  41
  42   debug("There should be 5 red triangles on 5 black squares above");
  43   debug("");
  44
  45   var wtu = WebGLTestUtils;
  46   var canvas3d = document.getElementById("example");
  47   var gl = wtu.create3DContext("example");
  48   var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
  49
  50   var vertexObject = gl.createBuffer();
  51   gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
  52   gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0 ]), gl.STATIC_DRAW);
  53   gl.enableVertexAttribArray(0);
  54   gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
  55
  56   gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  57   gl.drawArrays(gl.TRIANGLES, 0, 3);
  58
  59   function checkData(ctx, name) {
  60     // Test several locations
  61     // First line should be all black
  62     wtu.checkCanvasRect(ctx, 0, 0, 50, 1, [0, 0, 0, 0]);
  63
  64     // Line 25 should be red for at least 6 red pixels starting 22 pixels in
  65     wtu.checkCanvasRect(ctx, 22, 25, 6, 1, [255, 0, 0, 255]);
  66
  67     // Last line should be all black
  68     wtu.checkCanvasRect(ctx, 0, 49, 50, 1, [0, 0, 0, 0]);
  69   }
  70
  71   var ctx2d;
  72
  73   function checkColors() {
  74     checkData(gl, "3d context");
  75     checkData(ctx2d, "2d context");
  76   }
  77
  78   var table = [1, 2, 4, 8];
  79   for (var ii = 0; ii < table.length; ++ii) {
  80     gl.pixelStorei(gl.PACK_ALIGNMENT, table[ii]);
  81     ctx2d = document.getElementById("2d0" + ii).getContext("2d");
  82     ctx2d.globalCompositeOperation = 'copy';
  83     ctx2d.drawImage(canvas3d, 0, 0);
  84     checkColors();
  85     assertMsg(gl.getParameter(gl.PACK_ALIGNMENT) == table[ii],
  86         "PACK_ALIGNMENT is " + table[ii]);
  87   }
  88 }
  89
  90 init();
  91 var successfullyParsed = true;
  92 </script>
  93 <script src="../../../js/js-test-post.js"></script>
  94
  95 </body>
  96 </html>