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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @fileoverview This file contains functions helping to manipulate and manage
* textures.
*/
o3djs.provide('o3djs.texture');
/**
* A Module for bitmaps.
* @namespace
*/
o3djs.texture = o3djs.texture || {};
/**
* The maximum dimension of a texture.
* @type {number}
*/
o3djs.texture.MAX_TEXTURE_DIMENSION = 2048;
/**
* Computes the maximum number of levels of mips a given width and height could
* use.
* @param {number} width Width of texture.
* @param {number} height Height of texture.
* @return {number} The maximum number of levels for the given width and height.
*/
o3djs.texture.computeNumLevels = function(width, height) {
if (width == 0 || height == 0) {
return 0;
}
var max = Math.max(width, height);
var levels = 0;
while (max > 0) {
++levels;
max = max >> 1;
}
return levels;
};
/**
* Creates a texture from a RawData object.
* @param {!o3d.Pack} pack The pack to create the texture in.
* @param {!o3d.RawData} rawData The raw data to create the texture from.
* @param {boolean} opt_generateMips Whether or not to generate mips. Note, mips
* can not be generated for DXT textures although they will be loaded if they
* exist in the RawData.
* @param {boolean} opt_flip Whether or not to flip the texture. Most DCC tools
* Like Maya, Max, etc expect the textures to be flipped. Note that only
* 2D (image) textures will be flipped. Cube textures will not be flipped.
* Default = true.
* @param {number} opt_maxWidth The maximum width of the texture. If the RawData
* is larger than this size it will be scaled down to this size. Note that
* DXT format textures can not be scaled. Default = 2048.
* @param {number} opt_maxHeight The maximum width of the texture. If the
* RawData is larger than this size it will be scaled down to this size. Note
* that DXT format textures can not be scaled. Default = 2048.
* @return {!o3d.Texture} The created texture.
*/
o3djs.texture.createTextureFromRawData = function(
pack,
rawData,
opt_generateMips,
opt_flip,
opt_maxWidth,
opt_maxHeight) {
// Make a bitmaps from the raw data.
var bitmaps = pack.createBitmapsFromRawData(rawData);
if (opt_flip || typeof opt_flip === 'undefined') {
for (var ii = 0; ii < bitmaps.length; ++ii) {
var bitmap = bitmaps[ii];
if (bitmap.semantic == o3djs.base.o3d.Bitmap.IMAGE) {
bitmaps[ii].flipVertically();
}
}
}
// Create a texture from the bitmaps.
var texture = o3djs.texture.createTextureFromBitmaps(
pack, bitmaps, opt_generateMips);
// Delete the bitmaps.
for (var ii = 0; ii < bitmaps.length; ++ii) {
pack.removeObject(bitmaps[ii]);
}
return texture;
};
/**
* Returns whether or not a given texture format can be scaled.
* @param {!o3d.Texture.Format} format The format to check.
* @return {boolean} True if you can scale and make mips for the given format.
*/
o3djs.texture.canMakeMipsAndScale = function(format) {
switch (format) {
case o3djs.base.o3d.Texture.XRGB8:
case o3djs.base.o3d.Texture.ARGB8:
case o3djs.base.o3d.Texture.ABGR16F:
case o3djs.base.o3d.Texture.R32F:
case o3djs.base.o3d.Texture.ABGR32F:
return true;
case o3djs.base.o3d.Texture.DXT1:
case o3djs.base.o3d.Texture.DXT3:
case o3djs.base.o3d.Texture.DXT5:
return false;
}
return false;
};
/**
* Creates a Texture from an array of bitmaps.
* @param {!o3d.Pack} pack The pack to create the texture in.
* @param {!Array.<!o3d.Bitmap>} bitmaps An array of bitmaps to create the
* texture from. For a 2D texture this would be 1 bitmap. For a cubemap this
* would be 6 bitmaps.
* @param {boolean} opt_generateMips Whether or not to generate mips. Note, mips
* can not be generated for DXT textures although they will be loaded if they
* exist in the RawData. Default = true.
* @return {!o3d.Texture} The created texture.
*/
o3djs.texture.createTextureFromBitmaps = function(
pack,
bitmaps,
opt_generateMips) {
if (bitmaps.length == 0) {
throw 'no bitmaps';
}
var srcWidth = bitmaps[0].width;
var srcHeight = bitmaps[0].height;
var format = bitmaps[0].format;
var mipMaps = bitmaps[0].numMipmaps;
var maxMips = o3djs.texture.computeNumLevels(srcWidth, srcHeight);
var targetMips = mipMaps;
var dstWidth = srcWidth;
var dstHeight = srcHeight;
if ((typeof opt_generateMips === 'undefined' || opt_generateMips) &&
o3djs.texture.canMakeMipsAndScale(format) &&
mipMaps == 1 && maxMips > 1) {
targetMips = maxMips;
}
// Check that all the bitmaps are the same size and make mips
for (var ii = 0; ii < bitmaps.length; ++ii) {
var bitmap = bitmaps[ii];
if (bitmap.width != srcWidth ||
bitmap.height != srcHeight ||
bitmap.format != format ||
bitmap.numMipmaps != mipMaps) {
throw 'bitmaps must all be the same width, height, mips and format';
}
if (targetMips != mipMaps) {
bitmap.generateMips(0, targetMips - 1);
}
}
var levels = bitmap.numMipmaps > 1 ? bitmap.numMipmaps :
o3djs.texture.computeNumLevels(dstWidth, dstHeight);
var texture;
if (bitmaps.length == 6 &&
bitmaps[0].semantic != o3djs.base.o3d.Bitmap.SLICE) {
if (srcWidth != srcHeight ||
srcWidth != dstWidth ||
srcHeight != dstHeight) {
throw 'Cubemaps must be square';
}
texture = pack.createTextureCUBE(dstWidth, format, targetMips, false);
for (var ii = 0; ii < 6; ++ii) {
texture.setFromBitmap(
/** @type {o3d.TextureCUBE.CubeFace} */ (ii),
bitmaps[ii]);
}
} else if (bitmaps.length == 1) {
texture = pack.createTexture2D(
dstWidth, dstHeight, format, targetMips, false);
texture.setFromBitmap(bitmaps[0]);
}
return /** @type{!o3d.Texture} */ (texture);
};
/**
* Creates a TextureCUBE from 6 bitmaps. The bitmaps do not have to be the same
* size thought they do have to be the same format.
*
* @param {!o3d.Pack} pack The pack to create the texture in.
* @param {number} edgeLength The size of the cubemap.
* @param {!Array.<!o3d.Bitmap>} bitmaps An array of 6 bitmaps in the order
* FACE_POSITIVE_X, FACE_NEGATIVE_X, FACE_POSITIVE_Y, FACE_NEGATIVE_Y,
* FACE_POSITIVE_Z, FACE_NEGATIVE_Z.
* @return {!o3d.Texture} The created texture.
*/
o3djs.texture.createCubeTextureFrom6Bitmaps = function(
pack, edgeLength, bitmaps) {
var numMips = o3djs.texture.computeNumLevels(edgeLength, edgeLength);
var texture = pack.createTextureCUBE(
edgeLength, bitmaps[0].format, numMips, false);
for (var ii = 0; ii < 6; ++ii) {
var bitmap = bitmaps[ii];
texture.drawImage(bitmap, 0, 0, 0, bitmap.width, bitmap.height,
ii, 0, 0, edgeLength, edgeLength);
}
texture.generateMips(0, numMips - 1);
return texture;
};
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