texture-transparent-pixels-initialized.html (2569B)
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 <!DOCTYPE html> 7 <html> 8 <head> 9 <meta charset="utf-8"> 10 <link rel="stylesheet" href="../../../resources/js-test-style.css"/> 11 <script src="../../../js/js-test-pre.js"></script> 12 <script src="../../../js/webgl-test-utils.js"></script> 13 <script> 14 "use strict"; 15 var wtu = WebGLTestUtils; 16 var gl = null; 17 var texture; 18 var textureLoc = null; 19 var successfullyParsed = false; 20 21 function init() 22 { 23 description('Tests there is no garbage in transparent regions of images uploaded as textures'); 24 25 wtu = WebGLTestUtils; 26 gl = wtu.create3DContext("example"); 27 var program = wtu.setupTexturedQuad(gl); 28 gl.clearColor(0.5,0.5,0.5,1); 29 gl.clearDepth(1); 30 31 textureLoc = gl.getUniformLocation(program, "tex"); 32 33 // The input texture has 8 characters; take the leftmost one 34 var coeff = 1.0 / 8.0; 35 var texCoords = new Float32Array([ 36 coeff, 1.0, 37 0.0, 1.0, 38 0.0, 0.0, 39 coeff, 1.0, 40 0.0, 0.0, 41 coeff, 0.0]); 42 43 var vbo = gl.createBuffer(); 44 gl.bindBuffer(gl.ARRAY_BUFFER, vbo); 45 gl.bufferData(gl.ARRAY_BUFFER, texCoords, gl.STATIC_DRAW); 46 gl.enableVertexAttribArray(1); 47 gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0); 48 49 texture = wtu.loadTexture(gl, "../../../resources/bug-32888-texture.png", runTest); 50 } 51 52 // These two declarations need to be global for "shouldBe" to see them 53 var buf = null; 54 var idx = 0; 55 56 function runTest() 57 { 58 gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); 59 gl.enable(gl.BLEND); 60 gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA); 61 // Bind the texture to texture unit 0 62 gl.bindTexture(gl.TEXTURE_2D, texture); 63 // Point the uniform sampler to texture unit 0 64 gl.uniform1i(textureLoc, 0); 65 // Draw the triangles 66 wtu.clearAndDrawUnitQuad(gl, [0, 0, 0, 255]); 67 68 // Spot check a couple of 2x2 regions in the upper and lower left 69 // corners; they should be the rgb values in the texture. 70 var color = [0, 0, 0]; 71 debug("Checking lower left corner"); 72 wtu.checkCanvasRect(gl, 1, gl.canvas.height - 3, 2, 2, color, 73 "shouldBe " + color); 74 debug("Checking upper left corner"); 75 wtu.checkCanvasRect(gl, 1, 1, 2, 2, color, 76 "shouldBe " + color); 77 78 finishTest(); 79 } 80 </script> 81 </head> 82 <body onload="init()"> 83 <canvas id="example" width="32" height="32"></canvas> 84 <div id="description"></div> 85 <div id="console"></div> 86 </body> 87 </html>