dom/canvas/test/webgl-conf/checkout/conformance/rendering/simple.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>Simple Rendering 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">
  18 There is supposed to be an example drawing here, but it's not important.
  19 </canvas>
  20 <div id="description"></div>
  21 <div id="console"></div>
  22 <script id="vshader" type="x-shader/x-vertex">
  23 attribute vec4 a_Position;
  24 void main()
  25 {
  26   gl_Position = a_Position;
  27 }
  28 </script>
  29
  30 <script id="fshader" type="x-shader/x-fragment">
  31 void main()
  32 {
  33   gl_FragColor = vec4(0,1,0,1);
  34 }
  35 </script>
  36 <script>
  37 "use strict";
  38 var wtu = WebGLTestUtils;
  39 function init()
  40 {
  41   description();
  42
  43   var gl = wtu.create3DContext("example");
  44   var program = wtu.loadProgramFromScript(gl, "vshader", "fshader");
  45   gl.useProgram(program);
  46   var loc = gl.getAttribLocation(program, "a_Position");
  47
  48   var vertexObject = gl.createBuffer();
  49   gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
  50   gl.bufferData(
  51     gl.ARRAY_BUFFER,
  52     new Float32Array(
  53     [  1,  1,
  54       -1,  1,
  55       -1, -1,
  56        1,  1,
  57       -1, -1,
  58        1, -1]),
  59     gl.STATIC_DRAW);
  60   gl.enableVertexAttribArray(loc);
  61   gl.vertexAttribPointer(loc, 2, gl.FLOAT, false, 0, 0);
  62
  63   gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  64   wtu.checkCanvas(gl, [0,0,0,0], "should be black", 0);
  65   gl.drawArrays(gl.TRIANGLES, 0, 6);
  66   wtu.checkCanvas(gl, [0,255,0,255], "should be green", 0);
  67
  68   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
  69 }
  70
  71 init();
  72 var successfullyParsed = true;
  73 </script>
  74 <script src="../../js/js-test-post.js"></script>
  75
  76 </body>
  77 </html>