dom/canvas/test/webgl-conf/checkout/conformance/rendering/vertex-texture-fetch.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 Vertex Texture Fetch.</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 a_position;
  22 attribute vec2 a_texCoord;
  23 uniform sampler2D u_texture;
  24 varying vec4 color;
  25 void main() {
  26     gl_Position = a_position;
  27     color = texture2D(u_texture, a_texCoord);
  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 vertex texture fetch, if supported, operates correctly.");
  40 var wtu = WebGLTestUtils;
  41 var gl = wtu.create3DContext("example");
  42 if (!gl.getParameter(gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS)) {
  43   testPassed("No vertex texture image units (vertex texture fetch not supported) -- this is legal");
  44 } else {
  45   var texture = gl.createTexture();
  46   gl.bindTexture(gl.TEXTURE_2D, texture);
  47   gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_BYTE,
  48                 new Uint8Array([
  49                     255, 0, 0, 255,
  50                     0, 255, 0, 255,
  51                     0, 0, 255, 255,
  52                     255, 255, 0, 255]));
  53   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
  54   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
  55   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
  56   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
  57   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating texture");
  58
  59   var program = wtu.setupProgram(gl, ["vs", "fs"], ["vPosition", "vTexCoord"]);
  60   gl.uniform1i(gl.getUniformLocation(program, "u_texture"), 0);
  61   gl.disable(gl.BLEND);
  62   gl.disable(gl.DEPTH_TEST);
  63   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after initWebGL");
  64   var bufferObjects = wtu.setupUnitQuad(gl, 0);
  65   gl.disableVertexAttribArray(1);
  66
  67   gl.vertexAttrib2f(1, 0, 0);
  68   wtu.clearAndDrawUnitQuad(gl);
  69   wtu.checkCanvas(gl, [255, 0, 0, 255], "Should be red.");
  70
  71   gl.vertexAttrib2f(1, 1, 0);
  72   wtu.clearAndDrawUnitQuad(gl);
  73   wtu.checkCanvas(gl, [0, 255, 0, 255], "Should be green.");
  74
  75   gl.vertexAttrib2f(1, 0, 1);
  76   wtu.clearAndDrawUnitQuad(gl);
  77   wtu.checkCanvas(gl, [0, 0, 255, 255], "Should be blue.");
  78
  79   gl.vertexAttrib2f(1, 1, 1);
  80   wtu.clearAndDrawUnitQuad(gl);
  81   wtu.checkCanvas(gl, [255, 255, 0, 255], "Should be yellow.");
  82
  83   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
  84 }
  85
  86 var successfullyParsed = true;
  87 </script>
  88 <script src="../../js/js-test-post.js"></script>
  89
  90 </body>
  91 </html>