79 lines
3.6 KiB
C
79 lines
3.6 KiB
C
// File: rg_etc1.h - Fast, high quality ETC1 block packer/unpacker - Rich Geldreich <richgel99@gmail.com>
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// Please see ZLIB license at the end of this file.
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#ifndef __RG_ETC1_H__
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#define __RG_ETC1_H__
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typedef unsigned char bool;
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// Unpacks an 8-byte ETC1 compressed block to a block of 4x4 32bpp RGBA pixels.
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// Returns false if the block is invalid. Invalid blocks will still be unpacked with clamping.
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// This function is thread safe, and does not dynamically allocate any memory.
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// If preserve_alpha is true, the alpha channel of the destination pixels will not be overwritten. Otherwise, alpha will be set to 255.
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bool rg_etc1_unpack_block(const void *pETC1_block, unsigned int* pDst_pixels_rgba, bool preserve_alpha);
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// Quality setting = the higher the quality, the slower.
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// To pack large textures, it is highly recommended to call pack_etc1_block() in parallel, on different blocks, from multiple threads (particularly when using cHighQuality).
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typedef enum {
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rg_etc1_low_quality,
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rg_etc1_medium_quality,
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rg_etc1_high_quality
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} rg_etc1_quality;
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typedef struct
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{
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rg_etc1_quality m_quality;
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bool m_dithering;
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} rg_etc1_pack_params;
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// pack_etc1_block_init() should be called before calling pack_etc1_block(),
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// Otherwise rg_etc1_pack_block() will call rg_etc1_pack_block_init() for you.
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void rg_etc1_pack_block_init(void);
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// Packs a 4x4 block of 32bpp BGRA pixels to an 8-byte ETC1 block.
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// 32-bit BGRA pixels must always be arranged as (B,G,R,A) (B first, A last) in memory, independent of platform endianness. A should always be 255.
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// Returns squared error of result.
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// This function is thread safe, and does not dynamically allocate any memory.
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// pack_etc1_block() does not currently support "perceptual" colorspace metrics - it primarily optimizes for RGB RMSE.
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unsigned int rg_etc1_pack_block(void* pETC1_block, const unsigned int* pSrc_pixels_BGRA, rg_etc1_pack_params *pack_params);
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// Pack a 4x4 block of 32bpp BGRA pixels to a 16-byte RGBA8_ETC2_EAC block (supports alpha).
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unsigned int etc2_rgba8_block_pack(unsigned char *etc2, const unsigned int *bgra, rg_etc1_pack_params *params);
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// Pack a 4x4 block of 32bpp BGRA pixels to a 8-byte RGB8_ETC2 block (opaque).
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unsigned int etc2_rgb8_block_pack(unsigned char *etc2, const unsigned int *bgra, rg_etc1_pack_params *params);
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// ETC2 support: RGB8_ETC2
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void rg_etc2_rgb8_decode_block(const unsigned char *etc_block, unsigned int *bgra);
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// ETC2 support: RGBA8_ETC2_EAC
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void rg_etc2_rgba8_decode_block(const unsigned char *etc_block, unsigned int *bgra);
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//------------------------------------------------------------------------------
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//
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// rg_etc1 uses the ZLIB license:
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// http://opensource.org/licenses/Zlib
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//
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// Copyright (c) 2012 Rich Geldreich
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would be
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// appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not be
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// misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source distribution.
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//
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//------------------------------------------------------------------------------
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#endif // __RG_ETC1_H__
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