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/****************************************************************************
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Copyright (c) 2010-2012 cocos2d-x.org
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Copyright (c) 2013-2016 Chukong Technologies Inc.
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Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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Copyright (c) 2020 C4games Ltd.
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2022-07-09 07:07:01 +08:00
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https://adxeproject.github.io/
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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/* The etc1/etc2 compression tools
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* https://developer.arm.com/tools-and-software/graphics-and-gaming/mali-texture-compression-tool
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* https://github.com/google/etc2comp
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*/
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#ifndef __etc2_h__
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#define __etc2_h__
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/// @cond DO_NOT_SHOW
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typedef unsigned char etc2_byte;
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typedef int etc2_bool;
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typedef unsigned int etc2_uint32;
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#ifndef GL_COMPRESSED_RGB8_ETC2
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# define GL_COMPRESSED_RGB8_ETC2 0x9274
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#endif
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#ifndef GL_COMPRESSED_RGBA8_ETC2_EAC
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# define GL_COMPRESSED_RGBA8_ETC2_EAC 0x9278
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#endif
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// Size of a PKM header, in bytes.
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#define ETC2_PKM_HEADER_SIZE 16
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#define ETC2_RGB_NO_MIPMAPS 1
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#define ETC2_RGBA_NO_MIPMAPS 3
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// Check if a PKM header is correctly formatted.
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etc2_bool etc2_pkm_is_valid(const etc2_byte* pHeader);
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// Read the image width from a PKM header
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etc2_uint32 etc2_pkm_get_width(const etc2_byte* pHeader);
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// Read the image height from a PKM header
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etc2_uint32 etc2_pkm_get_height(const etc2_byte* pHeader);
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// Read the image format from a PKM header
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etc2_uint32 etc2_pkm_get_format(const etc2_byte* pHeader);
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/// <summary>
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/// Decode ETC2_RGB/ETC2_RGBA to RGBA8888
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/// Copy from: https://github.com/google/angle/tree/master/src/image_util
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/// </summary>
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/// <param name="format">Must be ETC2_RGBA_NO_MIPMAPS or ETC2_RGB_NO_MIPMAPS</param>
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/// <param name="input"></param>
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/// <param name="output"></param>
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/// <param name="width">pixelsHeight</param>
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/// <param name="height">pixelsWidth</param>
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/// <returns>0: success, -1: failed</returns>
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int etc2_decode_image(int format, const etc2_byte* input, etc2_byte* output, etc2_uint32 width, etc2_uint32 height);
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/// @endcond
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#endif
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