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comparison: content/canvas/test/webgl-conformance/conformance/reading/read-pixels-pack-alignment.html
content/canvas/test/webgl-conformance/conformance/reading/read-pixels-pack-alignment.html
- branch
- TOR_BUG_3246
- changeset 6
- 8bccb770b82d
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| -1:000000000000 | 0:25377063e084 |
|---|---|
| 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 id="vshader" type="x-shader/x-vertex"> | |
| 14 attribute vec3 pos; | |
| 15 attribute vec4 colorIn; | |
| 16 varying vec4 color; | |
| 17 | |
| 18 void main() | |
| 19 { | |
| 20 color = colorIn; | |
| 21 gl_Position = vec4(pos.xyz, 1.0); | |
| 22 } | |
| 23 </script> | |
| 24 | |
| 25 <script id="fshader" type="x-shader/x-fragment"> | |
| 26 precision mediump float; | |
| 27 varying vec4 color; | |
| 28 | |
| 29 void main() | |
| 30 { | |
| 31 gl_FragColor = color; | |
| 32 } | |
| 33 </script> | |
| 34 </head> | |
| 35 <body> | |
| 36 <canvas id="example" width="32px" height="32px"></canvas> | |
| 37 <div id="description"></div> | |
| 38 <div id="console"></div> | |
| 39 <script> | |
| 40 var successfullyParsed = false; | |
| 41 | |
| 42 // The below declarations need to be global for "shouldBe" to see them | |
| 43 var gl = null; | |
| 44 var array = null; | |
| 45 var pixel = [ 0, 0, 0, 0 ]; | |
| 46 var expectedColor = [ 0, 0, 0, 0 ]; | |
| 47 | |
| 48 function calculatePixelBytes(format, type) | |
| 49 { | |
| 50 var size = 0; | |
| 51 switch (format) { | |
| 52 case gl.ALPHA: | |
| 53 size = 1; | |
| 54 break; | |
| 55 case gl.RGB: | |
| 56 size = 3; | |
| 57 break; | |
| 58 case gl.RGBA: | |
| 59 size = 4; | |
| 60 break; | |
| 61 default: | |
| 62 return -1; | |
| 63 } | |
| 64 switch (type) { | |
| 65 case gl.UNSIGNED_BYTE: | |
| 66 break; | |
| 67 case gl.UNSIGNED_SHORT_5_6_5: | |
| 68 if (format != gl.RGB) | |
| 69 return -1; | |
| 70 size = 2; | |
| 71 break; | |
| 72 case gl.UNSIGNED_SHORT_4_4_4_4: | |
| 73 case gl.UNSIGNED_SHORT_5_5_5_1: | |
| 74 if (format != gl.RGBA) | |
| 75 return -1; | |
| 76 size = 2; | |
| 77 break; | |
| 78 default: | |
| 79 return -1; | |
| 80 } | |
| 81 return size; | |
| 82 } | |
| 83 | |
| 84 function calculatePaddingBytes(bytesPerPixel, packAlignment, width) | |
| 85 { | |
| 86 var padding = 0; | |
| 87 switch (packAlignment) { | |
| 88 case 1: | |
| 89 case 2: | |
| 90 case 4: | |
| 91 case 8: | |
| 92 padding = (bytesPerPixel * width) % packAlignment; | |
| 93 if (padding > 0) | |
| 94 padding = packAlignment - padding; | |
| 95 break; | |
| 96 default: | |
| 97 return -1; | |
| 98 } | |
| 99 return padding; | |
| 100 } | |
| 101 | |
| 102 function packColor(format, type, r, g, b, a) | |
| 103 { | |
| 104 // FIXME: not sure if the color packing is correct for UNSIGNED_SHORT_*. | |
| 105 var color = [ 0, 0, 0, 0 ]; | |
| 106 switch (type) { | |
| 107 case gl.UNSIGNED_BYTE: | |
| 108 switch (format) { | |
| 109 case gl.ALPHA: | |
| 110 color[0] = a; | |
| 111 break; | |
| 112 case gl.RGB: | |
| 113 color[0] = r; | |
| 114 color[1] = g; | |
| 115 color[2] = b; | |
| 116 break; | |
| 117 case gl.RGBA: | |
| 118 color[0] = r; | |
| 119 color[1] = g; | |
| 120 color[2] = b; | |
| 121 color[3] = a; | |
| 122 break; | |
| 123 default: | |
| 124 return null; | |
| 125 } | |
| 126 break; | |
| 127 case gl.UNSIGNED_SHORT_5_6_5: | |
| 128 if (format != gl.RGB) | |
| 129 return null; | |
| 130 r >>= 3; | |
| 131 g >>= 2; | |
| 132 b >>= 3; | |
| 133 color[0] = (r << 11) + (g << 5) + b; | |
| 134 break; | |
| 135 case gl.UNSIGNED_SHORT_4_4_4_4: | |
| 136 if (format != gl.RGBA) | |
| 137 return null; | |
| 138 r >>= 4; | |
| 139 g >>= 4; | |
| 140 b >>= 4; | |
| 141 a >>= 4; | |
| 142 color[0] = (r << 12) + (g << 8) + (b << 4) + a; | |
| 143 break; | |
| 144 case gl.UNSIGNED_SHORT_5_5_5_1: | |
| 145 if (format != gl.RGBA) | |
| 146 return null; | |
| 147 r >>= 3; | |
| 148 g >>= 3; | |
| 149 b >>= 3; | |
| 150 a >>= 7; | |
| 151 color[0] = (r << 11) + (g << 6) + (b << 1) + a; | |
| 152 break; | |
| 153 Default: | |
| 154 return null; | |
| 155 } | |
| 156 return color; | |
| 157 } | |
| 158 | |
| 159 function runTestIteration(format, type, packAlignment, width, height) | |
| 160 { | |
| 161 debug("Testing PACK_ALIGNMENT = " + packAlignment + ", width = " + width + ", height = " + height); | |
| 162 gl.clearColor(1, 0.4, 0, 1); | |
| 163 gl.clear(gl.COLOR_BUFFER_BIT); | |
| 164 gl.pixelStorei(gl.PACK_ALIGNMENT, packAlignment); | |
| 165 glErrorShouldBe(gl, gl.NO_ERROR); | |
| 166 var bytesPerPixel = calculatePixelBytes(format, type); | |
| 167 var padding = calculatePaddingBytes(bytesPerPixel, packAlignment, width); | |
| 168 var size = bytesPerPixel * width * height + padding * (height - 1); | |
| 169 if (type != gl.UNSIGNED_BYTE) { | |
| 170 throw "test error: only UNSIGNED_BYTE is valid to ReadPixels"; | |
| 171 } | |
| 172 if (size < 0) | |
| 173 size = 0; | |
| 174 array = new Uint8Array(size); | |
| 175 gl.readPixels(0, 0, width, height, format, type, array); | |
| 176 if (width < 0 || height < 0) { | |
| 177 glErrorShouldBe(gl, gl.INVALID_VALUE); | |
| 178 return; | |
| 179 } | |
| 180 | |
| 181 glErrorShouldBe(gl, gl.NO_ERROR); | |
| 182 if (!array.length) | |
| 183 return; | |
| 184 | |
| 185 // Check the last pixel of the last row. | |
| 186 var bytesPerRow = width * bytesPerPixel + padding; | |
| 187 var pos = bytesPerRow * (height - 1) + (width - 1) * bytesPerPixel; | |
| 188 var numComponents = bytesPerPixel; | |
| 189 for (var i = 0; i < numComponents; ++i) | |
| 190 pixel[i] = array[pos + i]; | |
| 191 for (var i = numComponents; i < 4; ++i) | |
| 192 pixel[i] = 0; | |
| 193 expectedColor = packColor(format, type, 255, 102, 0, 255); | |
| 194 shouldBeNonNull("expectedColor"); | |
| 195 shouldBe("pixel", "expectedColor"); | |
| 196 } | |
| 197 | |
| 198 description('Verify readPixels() works fine with various PACK_ALIGNMENT values.'); | |
| 199 | |
| 200 shouldBeNonNull("gl = initWebGL('example', 'vshader', 'fshader', [ 'pos', 'colorIn' ], [ 0, 0, 0, 1 ], 1)"); | |
| 201 gl.disable(gl.BLEND); | |
| 202 | |
| 203 var formats = [ gl.RGBA ]; | |
| 204 var formatNames = [ "RGBA" ]; | |
| 205 | |
| 206 for (var i = 0; i < formats.length; ++i) { | |
| 207 var format = formats[i]; | |
| 208 | |
| 209 debug("Testing format = " + formatNames[i] + " and type = UNSIGNED_BYTE"); | |
| 210 runTestIteration(format, gl.UNSIGNED_BYTE, 1, 1, 2); | |
| 211 runTestIteration(format, gl.UNSIGNED_BYTE, 2, 1, 2); | |
| 212 runTestIteration(format, gl.UNSIGNED_BYTE, 4, 1, 2); | |
| 213 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 1, 2); | |
| 214 runTestIteration(format, gl.UNSIGNED_BYTE, 4, 2, 2); | |
| 215 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 2, 2); | |
| 216 runTestIteration(format, gl.UNSIGNED_BYTE, 4, 3, 2); | |
| 217 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 3, 2); | |
| 218 runTestIteration(format, gl.UNSIGNED_BYTE, 4, 4, 2); | |
| 219 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 4, 2); | |
| 220 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 5, 1); | |
| 221 runTestIteration(format, gl.UNSIGNED_BYTE, 4, 5, 2); | |
| 222 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 5, 2); | |
| 223 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 6, 2); | |
| 224 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 7, 2); | |
| 225 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 8, 2); | |
| 226 runTestIteration(format, gl.UNSIGNED_BYTE, 1, 0, 0); | |
| 227 runTestIteration(format, gl.UNSIGNED_BYTE, 2, 0, 0); | |
| 228 runTestIteration(format, gl.UNSIGNED_BYTE, 4, 0, 0); | |
| 229 runTestIteration(format, gl.UNSIGNED_BYTE, 8, 0, 0); | |
| 230 runTestIteration(format, gl.UNSIGNED_BYTE, 1, -1, 1); | |
| 231 runTestIteration(format, gl.UNSIGNED_BYTE, 2, 1, -1); | |
| 232 runTestIteration(format, gl.UNSIGNED_BYTE, 4, 0, -1); | |
| 233 runTestIteration(format, gl.UNSIGNED_BYTE, 8, -1, -1); | |
| 234 } | |
| 235 | |
| 236 successfullyParsed = true; | |
| 237 </script> | |
| 238 <script>finishTest();</script> | |
| 239 </body> | |
| 240 </html> |
