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Unified Diff: conformance/reading/read-pixels-pack-alignment.html

Issue 8342021: Add webgl conformance tests r15841. (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/webgl/sdk/tests/
Patch Set: Created 9 years, 2 months ago
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Index: conformance/reading/read-pixels-pack-alignment.html
===================================================================
--- conformance/reading/read-pixels-pack-alignment.html (revision 0)
+++ conformance/reading/read-pixels-pack-alignment.html (revision 0)
@@ -0,0 +1,240 @@
+<!--
+Copyright (c) 2011 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+ -->
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../resources/js-test-pre.js"></script>
+<script src="../resources/webgl-test.js"></script>
+<script id="vshader" type="x-shader/x-vertex">
+attribute vec3 pos;
+attribute vec4 colorIn;
+varying vec4 color;
+
+void main()
+{
+ color = colorIn;
+ gl_Position = vec4(pos.xyz, 1.0);
+}
+</script>
+
+<script id="fshader" type="x-shader/x-fragment">
+precision mediump float;
+varying vec4 color;
+
+void main()
+{
+ gl_FragColor = color;
+}
+</script>
+</head>
+<body>
+<canvas id="example" width="32px" height="32px"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+var successfullyParsed = false;
+
+// The below declarations need to be global for "shouldBe" to see them
+var gl = null;
+var array = null;
+var pixel = [ 0, 0, 0, 0 ];
+var expectedColor = [ 0, 0, 0, 0 ];
+
+function calculatePixelBytes(format, type)
+{
+ var size = 0;
+ switch (format) {
+ case gl.ALPHA:
+ size = 1;
+ break;
+ case gl.RGB:
+ size = 3;
+ break;
+ case gl.RGBA:
+ size = 4;
+ break;
+ default:
+ return -1;
+ }
+ switch (type) {
+ case gl.UNSIGNED_BYTE:
+ break;
+ case gl.UNSIGNED_SHORT_5_6_5:
+ if (format != gl.RGB)
+ return -1;
+ size = 2;
+ break;
+ case gl.UNSIGNED_SHORT_4_4_4_4:
+ case gl.UNSIGNED_SHORT_5_5_5_1:
+ if (format != gl.RGBA)
+ return -1;
+ size = 2;
+ break;
+ default:
+ return -1;
+ }
+ return size;
+}
+
+function calculatePaddingBytes(bytesPerPixel, packAlignment, width)
+{
+ var padding = 0;
+ switch (packAlignment) {
+ case 1:
+ case 2:
+ case 4:
+ case 8:
+ padding = (bytesPerPixel * width) % packAlignment;
+ if (padding > 0)
+ padding = packAlignment - padding;
+ break;
+ default:
+ return -1;
+ }
+ return padding;
+}
+
+function packColor(format, type, r, g, b, a)
+{
+ // FIXME: not sure if the color packing is correct for UNSIGNED_SHORT_*.
+ var color = [ 0, 0, 0, 0 ];
+ switch (type) {
+ case gl.UNSIGNED_BYTE:
+ switch (format) {
+ case gl.ALPHA:
+ color[0] = a;
+ break;
+ case gl.RGB:
+ color[0] = r;
+ color[1] = g;
+ color[2] = b;
+ break;
+ case gl.RGBA:
+ color[0] = r;
+ color[1] = g;
+ color[2] = b;
+ color[3] = a;
+ break;
+ default:
+ return null;
+ }
+ break;
+ case gl.UNSIGNED_SHORT_5_6_5:
+ if (format != gl.RGB)
+ return null;
+ r >>= 3;
+ g >>= 2;
+ b >>= 3;
+ color[0] = (r << 11) + (g << 5) + b;
+ break;
+ case gl.UNSIGNED_SHORT_4_4_4_4:
+ if (format != gl.RGBA)
+ return null;
+ r >>= 4;
+ g >>= 4;
+ b >>= 4;
+ a >>= 4;
+ color[0] = (r << 12) + (g << 8) + (b << 4) + a;
+ break;
+ case gl.UNSIGNED_SHORT_5_5_5_1:
+ if (format != gl.RGBA)
+ return null;
+ r >>= 3;
+ g >>= 3;
+ b >>= 3;
+ a >>= 7;
+ color[0] = (r << 11) + (g << 6) + (b << 1) + a;
+ break;
+ Default:
+ return null;
+ }
+ return color;
+}
+
+function runTestIteration(format, type, packAlignment, width, height)
+{
+ debug("Testing PACK_ALIGNMENT = " + packAlignment + ", width = " + width + ", height = " + height);
+ gl.clearColor(1, 0.4, 0, 1);
+ gl.clear(gl.COLOR_BUFFER_BIT);
+ gl.pixelStorei(gl.PACK_ALIGNMENT, packAlignment);
+ glErrorShouldBe(gl, gl.NO_ERROR);
+ var bytesPerPixel = calculatePixelBytes(format, type);
+ var padding = calculatePaddingBytes(bytesPerPixel, packAlignment, width);
+ var size = bytesPerPixel * width * height + padding * (height - 1);
+ if (type != gl.UNSIGNED_BYTE) {
+ throw "test error: only UNSIGNED_BYTE is valid to ReadPixels";
+ }
+ if (size < 0)
+ size = 0;
+ array = new Uint8Array(size);
+ gl.readPixels(0, 0, width, height, format, type, array);
+ if (width < 0 || height < 0) {
+ glErrorShouldBe(gl, gl.INVALID_VALUE);
+ return;
+ }
+
+ glErrorShouldBe(gl, gl.NO_ERROR);
+ if (!array.length)
+ return;
+
+ // Check the last pixel of the last row.
+ var bytesPerRow = width * bytesPerPixel + padding;
+ var pos = bytesPerRow * (height - 1) + (width - 1) * bytesPerPixel;
+ var numComponents = bytesPerPixel;
+ for (var i = 0; i < numComponents; ++i)
+ pixel[i] = array[pos + i];
+ for (var i = numComponents; i < 4; ++i)
+ pixel[i] = 0;
+ expectedColor = packColor(format, type, 255, 102, 0, 255);
+ shouldBeNonNull(expectedColor);
+ shouldBe("pixel", "expectedColor");
+}
+
+description('Verify readPixels() works fine with various PACK_ALIGNMENT values.');
+
+shouldBeNonNull("gl = initWebGL('example', 'vshader', 'fshader', [ 'pos', 'colorIn' ], [ 0, 0, 0, 1 ], 1)");
+gl.disable(gl.BLEND);
+
+var formats = [ gl.RGBA ];
+var formatNames = [ "RGBA" ];
+
+for (var i = 0; i < formats.length; ++i) {
+ var format = formats[i];
+
+ debug("Testing format = " + formatNames[i] + " and type = UNSIGNED_BYTE");
+ runTestIteration(format, gl.UNSIGNED_BYTE, 1, 1, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 2, 1, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 4, 1, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 1, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 4, 2, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 2, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 4, 3, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 3, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 4, 4, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 4, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 5, 1);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 4, 5, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 5, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 6, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 7, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 8, 2);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 1, 0, 0);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 2, 0, 0);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 4, 0, 0);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, 0, 0);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 1, -1, 1);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 2, 1, -1);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 4, 0, -1);
+ runTestIteration(format, gl.UNSIGNED_BYTE, 8, -1, -1);
+}
+
+successfullyParsed = true;
+</script>
+<script src="../../resources/js-test-post.js"></script>
+</body>
+</html>
Property changes on: conformance/reading/read-pixels-pack-alignment.html
___________________________________________________________________
Added: svn:eol-style
+ LF
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