glsl-function-texture2dlod.html (3194B)
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 texture2D GLSL conformance test.</title> 12 <link rel="stylesheet" href="../../../resources/js-test-style.css"/> 13 <link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/> 14 <script src="../../../js/js-test-pre.js"></script> 15 <script src="../../../js/webgl-test-utils.js"> </script> 16 </head> 17 <body> 18 <canvas id="example" width="256" height="256" style="width: 16px; height: 16px;"></canvas> 19 <div id="description"></div> 20 <div id="console"></div> 21 <script id="vshader2d" type="x-shader/x-vertex"> 22 attribute vec4 vPosition; 23 attribute vec2 texCoord0; 24 varying vec4 color; 25 uniform sampler2D tex; 26 uniform float lod; 27 void main() { 28 gl_Position = vPosition; 29 color = texture2DLod(tex, texCoord0, lod); 30 } 31 </script> 32 <script id="fshader2d" type="x-shader/x-fragment"> 33 precision mediump float; 34 varying vec4 color; 35 void main() { 36 gl_FragData[0] = color; 37 } 38 </script> 39 <script> 40 "use strict"; 41 description("tests GLSL texture2DLod function"); 42 43 var wtu = WebGLTestUtils; 44 var canvas = document.getElementById("example"); 45 46 shouldBe("canvas.width", "256"); 47 shouldBe("canvas.height", "256"); 48 49 var colors = [ 50 {name: 'red', color:[255, 0, 0, 255]}, 51 {name: 'green', color:[0, 255, 0, 255]}, 52 {name: 'blue', color:[0, 0, 255, 255]}, 53 {name: 'yellow', color:[255, 255, 0, 255]}, 54 {name: 'magenta', color:[255, 0, 255, 255]}, 55 {name: 'cyan', color:[0, 255, 255, 255]}, 56 {name: 'pink', color:[255, 128, 128, 255]}, 57 {name: 'gray', color:[128, 128, 128, 255]}, 58 {name: 'light green', color:[128, 255, 128, 255]}, 59 ]; 60 61 var gl = wtu.create3DContext(canvas); 62 if (gl.getParameter(gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS) > 0) { 63 runTest(); 64 } else { 65 testPassed("MAX_VERTEX_TEXTURE_IMAGE_UNITS == 0, this is okay."); 66 } 67 68 function runTest() { 69 var program = wtu.setupProgram( 70 gl, ['vshader2d', 'fshader2d'], ['vPosition', 'texCoord0'], [0, 1]); 71 wtu.setupUnitQuad(gl, 0, 1); 72 73 shouldBe("colors.length", "9"); 74 75 var tex = gl.createTexture(); 76 gl.bindTexture(gl.TEXTURE_2D, tex); 77 gl.texParameteri( 78 gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_LINEAR); 79 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR); 80 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT); 81 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT); 82 83 for (var ii = 0; ii < colors.length; ++ii) { 84 var color = colors[ii]; 85 var size = Math.pow(2, colors.length - ii - 1); 86 wtu.fillTexture(gl, tex, size, size, color.color, ii); 87 } 88 89 var loc = gl.getUniformLocation(program, "lod"); 90 91 for (var ii = 0; ii < colors.length; ++ii) { 92 gl.uniform1f(loc, ii); 93 var color = colors[ii]; 94 wtu.clearAndDrawUnitQuad(gl); 95 wtu.checkCanvas( 96 gl, color.color, 97 "256x256 texture drawn to 256x256 dest with lod = " + ii + 98 " should be " + color.name); 99 } 100 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors."); 101 } 102 103 var successfullyParsed = true; 104 105 </script> 106 <script src="../../../js/js-test-post.js"></script> 107 108 </body> 109 </html>