glsl-function-texture2d-bias.html (2982B)
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 vec2 texCoord; 25 void main() { 26 gl_Position = vPosition; 27 texCoord = texCoord0; 28 } 29 </script> 30 <script id="fshader2d" type="x-shader/x-fragment"> 31 precision mediump float; 32 uniform sampler2D tex; 33 uniform float bias; 34 varying vec2 texCoord; 35 void main() { 36 gl_FragData[0] = texture2D(tex, texCoord, bias); 37 } 38 </script> 39 <script> 40 "use strict"; 41 description("tests GLSL texture2D function with bias"); 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 gl = wtu.create3DContext(canvas); 50 var program = wtu.setupProgram( 51 gl, ['vshader2d', 'fshader2d'], ['vPosition', 'texCoord0'], [0, 1]); 52 wtu.setupUnitQuad(gl, 0, 1); 53 54 var colors = [ 55 {name: 'red', color:[255, 0, 0, 255]}, 56 {name: 'green', color:[0, 255, 0, 255]}, 57 {name: 'blue', color:[0, 0, 255, 255]}, 58 {name: 'yellow', color:[255, 255, 0, 255]}, 59 {name: 'magenta', color:[255, 0, 255, 255]}, 60 {name: 'cyan', color:[0, 255, 255, 255]}, 61 {name: 'pink', color:[255, 128, 128, 255]}, 62 {name: 'gray', color:[128, 128, 128, 255]}, 63 {name: 'light green', color:[128, 255, 128, 255]}, 64 ]; 65 66 shouldBe("colors.length", "9"); 67 68 var tex = gl.createTexture(); 69 gl.bindTexture(gl.TEXTURE_2D, tex); 70 gl.texParameteri( 71 gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_NEAREST); 72 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR); 73 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT); 74 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT); 75 76 for (var ii = 0; ii < colors.length; ++ii) { 77 var color = colors[ii]; 78 var size = Math.pow(2, colors.length - ii - 1); 79 wtu.fillTexture(gl, tex, size, size, color.color, ii); 80 } 81 82 var loc = gl.getUniformLocation(program, "bias"); 83 84 for (var ii = 0; ii < colors.length; ++ii) { 85 gl.uniform1f(loc, ii); 86 var color = colors[ii]; 87 wtu.clearAndDrawUnitQuad(gl); 88 wtu.checkCanvas( 89 gl, color.color, 90 "256x256 texture drawn to 256x256 dest with bias = " + ii + 91 " should be " + color.name); 92 } 93 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors."); 94 95 var successfullyParsed = true; 96 97 </script> 98 <script src="../../../js/js-test-post.js"></script> 99 100 </body> 101 </html>