vertex-texture-fetch.html (3020B)
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>