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comparison: content/canvas/test/webgl-conformance/conformance/renderbuffers/renderbuffer-initialization.html
content/canvas/test/webgl-conformance/conformance/renderbuffers/renderbuffer-initialization.html
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| 1 <!-- | |
| 2 Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 3 Use of this source code is governed by a BSD-style license that can be | |
| 4 found in the LICENSE 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="../../resources/js-test-pre.js"></script> | |
| 12 <script src="../resources/webgl-test.js"></script> | |
| 13 <script src="../resources/webgl-test-utils.js"></script> | |
| 14 </head> | |
| 15 <body> | |
| 16 <canvas id="testbed" width="400" height="400" style="width: 40px; height: 40px;"></canvas> | |
| 17 <div id="description"></div> | |
| 18 <div id="console"></div> | |
| 19 <script> | |
| 20 var wtu = WebGLTestUtils; | |
| 21 description('Verify renderbuffers are initialized to 0 before being read in WebGL'); | |
| 22 | |
| 23 var gl = wtu.create3DContext("testbed"); | |
| 24 if (!gl) { | |
| 25 testFailed('canvas.getContext() failed'); | |
| 26 } else { | |
| 27 // Set the clear color to green. It should never show up. | |
| 28 gl.clearColor(0, 1, 0, 1); | |
| 29 | |
| 30 runTest(gl, gl.canvas.width, gl.canvas.height, 0); | |
| 31 runTest(gl, gl.canvas.width, gl.canvas.height, 1); | |
| 32 runTest(gl, gl.canvas.width, gl.canvas.height, 0); | |
| 33 runTest(gl, gl.canvas.width, gl.canvas.height, 1); | |
| 34 | |
| 35 // Testing buffer clearing won't change the clear values. | |
| 36 var clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE); | |
| 37 shouldBe("clearColor", "[0, 1, 0, 1]"); | |
| 38 glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors'); | |
| 39 } | |
| 40 | |
| 41 function runTest(gl, width, height, order) | |
| 42 { | |
| 43 wtu.checkCanvasRect(gl, 0, 0, width, height, [0,0,0,0], | |
| 44 "internal buffers have been initialized to 0"); | |
| 45 | |
| 46 // fill the back buffer so we know that reading below happens from | |
| 47 // the renderbuffer. | |
| 48 gl.clear(gl.COLOR_BUFFER_BIT); | |
| 49 | |
| 50 var fbo = gl.createFramebuffer(); | |
| 51 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); | |
| 52 var colorbuffer = gl.createRenderbuffer(); | |
| 53 gl.bindRenderbuffer(gl.RENDERBUFFER, colorbuffer); | |
| 54 switch (order) { | |
| 55 case 0: | |
| 56 allocStorage(width, height); | |
| 57 attachBuffer(colorbuffer); | |
| 58 break; | |
| 59 case 1: | |
| 60 attachBuffer(colorbuffer); | |
| 61 allocStorage(width, height); | |
| 62 break; | |
| 63 } | |
| 64 | |
| 65 function allocStorage(width, height) { | |
| 66 gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, width, height); | |
| 67 glErrorShouldBe(gl, gl.NO_ERROR, 'should be no error after renderbufferStorage(internalformat = RGBA4).'); | |
| 68 } | |
| 69 | |
| 70 function attachBuffer(colorbuffer) { | |
| 71 gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, colorbuffer); | |
| 72 } | |
| 73 | |
| 74 if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) { | |
| 75 testFailed('Framebuffer incomplete.'); | |
| 76 return; | |
| 77 } | |
| 78 | |
| 79 wtu.checkCanvasRect(gl, 0, 0, width, height, [0,0,0,0], | |
| 80 "user buffers have been initialized to 0"); | |
| 81 | |
| 82 gl.deleteFramebuffer(fbo); | |
| 83 gl.deleteRenderbuffer(colorbuffer); | |
| 84 | |
| 85 // this clear should not matter we are about to resize | |
| 86 gl.clear(gl.COLOR_BUFFER_BIT); | |
| 87 | |
| 88 gl.canvas.width += 1; | |
| 89 gl.canvas.height += 1; | |
| 90 | |
| 91 debug(''); | |
| 92 } | |
| 93 | |
| 94 successfullyParsed = true; | |
| 95 </script> | |
| 96 <script>finishTest();</script> | |
| 97 </body> | |
| 98 </html> |
