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/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/
"use strict";
var CompressedTextureUtils = (function() {
var formatToString = function(ext, format) {
for (var p in ext) {
if (ext[p] == format) {
return p;
}
}
return "0x" + format.toString(16);
};
/**
* Make an image element from Uint8Array bitmap data.
* @param {number} imageHeight Height of the data in pixels.
* @param {number} imageWidth Width of the data in pixels.
* @param {number} dataWidth Width of each row in the data buffer, in pixels.
* @param {Uint8Array} data Image data buffer to display. Each pixel takes up 4 bytes in the array regardless of the alpha parameter.
* @param {boolean} alpha True if alpha data should be taken from data. Otherwise alpha channel is set to 255.
* @return {HTMLImageElement} The image element.
*/
var makeScaledImage = function(imageWidth, imageHeight, dataWidth, data, alpha, opt_scale) {
var scale = opt_scale ? opt_scale : 8;
var c = document.createElement("canvas");
c.width = imageWidth * scale;
c.height = imageHeight * scale;
var ctx = c.getContext("2d");
for (var yy = 0; yy < imageHeight; ++yy) {
for (var xx = 0; xx < imageWidth; ++xx) {
var offset = (yy * dataWidth + xx) * 4;
ctx.fillStyle = "rgba(" +
data[offset + 0] + "," +
data[offset + 1] + "," +
data[offset + 2] + "," +
(alpha ? data[offset + 3] / 255 : 1) + ")";
ctx.fillRect(xx * scale, yy * scale, scale, scale);
}
}
return wtu.makeImageFromCanvas(c);
};
var insertCaptionedImg = function(parent, caption, img) {
var div = document.createElement("div");
div.appendChild(img);
var label = document.createElement("div");
label.appendChild(document.createTextNode(caption));
div.appendChild(label);
parent.appendChild(div);
};
/**
* @param {WebGLRenderingContextBase} gl
* @param {Object} compressedFormats Mapping from format names to format enum values.
* @param expectedByteLength A function that takes in width, height and format and returns the expected buffer size in bytes.
*/
var testCompressedFormatsUnavailableWhenExtensionDisabled = function(gl, compressedFormats, expectedByteLength, testSize) {
var tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
for (var name in compressedFormats) {
if (compressedFormats.hasOwnProperty(name)) {
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, compressedFormats[name], testSize, testSize, 0, new Uint8Array(expectedByteLength(testSize, testSize, compressedFormats[name])));
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "Trying to use format " + name + " with extension disabled.");
}
}
gl.bindTexture(gl.TEXTURE_2D, null);
gl.deleteTexture(tex);
};
/**
* @param {WebGLRenderingContextBase} gl
* @param {Object} expectedFormats Mapping from format names to format enum values.
*/
var testCompressedFormatsListed = function(gl, expectedFormats) {
debug("");
debug("Testing that every format is listed by the compressed texture formats query");
var supportedFormats = gl.getParameter(gl.COMPRESSED_TEXTURE_FORMATS);
var failed;
var count = 0;
for (var name in expectedFormats) {
if (expectedFormats.hasOwnProperty(name)) {
++count;
var format = expectedFormats[name];
failed = true;
for (var ii = 0; ii < supportedFormats.length; ++ii) {
if (format == supportedFormats[ii]) {
testPassed("supported format " + name + " exists");
failed = false;
break;
}
}
if (failed) {
testFailed("supported format " + name + " does not exist");
}
}
}
if (supportedFormats.length != count) {
testFailed("Incorrect number of supported formats, was " + supportedFormats.length + " should be " + count);
}
};
/**
* @param {Object} ext Compressed texture extension object.
* @param {Object} expectedFormats Mapping from format names to format enum values.
*/
var testCorrectEnumValuesInExt = function(ext, expectedFormats) {
debug("");
debug("Testing that format enum values in the extension object are correct");
for (name in expectedFormats) {
if (expectedFormats.hasOwnProperty(name)) {
if (isResultCorrect(ext[name], expectedFormats[name])) {
testPassed("Enum value for " + name + " matches 0x" + ext[name].toString(16));
} else {
testFailed("Enum value for " + name + " mismatch: 0x" + ext[name].toString(16) + " should be 0x" + expectedFormats[name].toString(16));
}
}
}
};
/**
* @param {WebGLRenderingContextBase} gl
* @param {Object} validFormats Mapping from format names to format enum values.
* @param expectedByteLength A function that takes in width, height and format and returns the expected buffer size in bytes.
* @param getBlockDimensions A function that takes in a format and returns block size in pixels.
*/
var testFormatRestrictionsOnBufferSize = function(gl, validFormats, expectedByteLength, getBlockDimensions) {
debug("");
debug("Testing format restrictions on texture upload buffer size");
var tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
for (var formatId in validFormats) {
if (validFormats.hasOwnProperty(formatId)) {
var format = validFormats[formatId];
var blockSize = getBlockDimensions(format);
var expectedSize = expectedByteLength(blockSize.width * 4, blockSize.height * 4, format);
var data = new Uint8Array(expectedSize);
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, format, blockSize.width * 3, blockSize.height * 4, 0, data);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, formatId + " data size does not match dimensions (too small width)");
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, format, blockSize.width * 5, blockSize.height * 4, 0, data);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, formatId + " data size does not match dimensions (too large width)");
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, format, blockSize.width * 4, blockSize.height * 3, 0, data);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, formatId + " data size does not match dimensions (too small height)");
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, format, blockSize.width * 4, blockSize.height * 5, 0, data);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, formatId + " data size does not match dimensions (too large height)");
}
}
};
/**
* @param {WebGLRenderingContextBase} gl
* @param {Object} validFormats Mapping from format names to format enum values.
* @param expectedByteLength A function that takes in width, height and format and returns the expected buffer size in bytes.
* @param getBlockDimensions A function that takes in a format and returns block size in pixels.
* @param {number} width Width of the image in pixels.
* @param {number} height Height of the image in pixels.
* @param {Object} subImageConfigs configs for compressedTexSubImage calls
*/
var testTexSubImageDimensions = function(gl, validFormats, expectedByteLength, getBlockDimensions, width, height, subImageConfigs) {
var tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
for (var formatId in validFormats) {
if (validFormats.hasOwnProperty(formatId)) {
var format = validFormats[formatId];
var blockSize = getBlockDimensions(format);
var expectedSize = expectedByteLength(width, height, format);
var data = new Uint8Array(expectedSize);
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, format, width, height, 0, data);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "setting up compressed texture");
for (let i = 0, len = subImageConfigs.length; i < len; ++i) {
let c = subImageConfigs[i];
var subData = new Uint8Array(expectedByteLength(c.width, c.height, format));
gl.compressedTexSubImage2D(gl.TEXTURE_2D, 0, c.xoffset, c.yoffset, c.width, c.height, format, subData);
wtu.glErrorShouldBe(gl, c.expectation, c.message);
}
}
}
gl.bindTexture(gl.TEXTURE_2D, null);
gl.deleteTexture(tex);
};
return {
formatToString: formatToString,
insertCaptionedImg: insertCaptionedImg,
makeScaledImage: makeScaledImage,
testCompressedFormatsListed: testCompressedFormatsListed,
testCompressedFormatsUnavailableWhenExtensionDisabled: testCompressedFormatsUnavailableWhenExtensionDisabled,
testCorrectEnumValuesInExt: testCorrectEnumValuesInExt,
testFormatRestrictionsOnBufferSize: testFormatRestrictionsOnBufferSize,
testTexSubImageDimensions: testTexSubImageDimensions,
};
})();
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