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  1. /*
  2.  * Texture block module
  3.  * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * Texture block (4x4) module
  25.  *
  26.  * References:
  27.  *   https://www.opengl.org/wiki/S3_Texture_Compression
  28.  *   https://www.opengl.org/wiki/Red_Green_Texture_Compression
  29.  *   https://msdn.microsoft.com/en-us/library/bb694531%28v=vs.85%29.aspx
  30.  *
  31.  * All functions return how much data has been written or read.
  32.  *
  33.  * Pixel input or output format is always AV_PIX_FMT_RGBA.
  34.  */
  35.  
  36. #ifndef AVCODEC_TEXTUREDSP_H
  37. #define AVCODEC_TEXTUREDSP_H
  38.  
  39. #include <stddef.h>
  40. #include <stdint.h>
  41.  
  42. #define TEXTURE_BLOCK_W 4
  43. #define TEXTURE_BLOCK_H 4
  44.  
  45. typedef struct TextureDSPContext {
  46.     int (*dxt1_block)  (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  47.     int (*dxt1a_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  48.     int (*dxt2_block)  (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  49.     int (*dxt3_block)  (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  50.     int (*dxt4_block)  (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  51.     int (*dxt5_block)  (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  52.     int (*dxt5y_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  53.     int (*dxt5ys_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  54.     int (*rgtc1s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  55.     int (*rgtc1u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  56.     int (*rgtc2s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  57.     int (*rgtc2u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  58.     int (*dxn3dc_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
  59. } TextureDSPContext;
  60.  
  61. void ff_texturedsp_init(TextureDSPContext *c);
  62. void ff_texturedspenc_init(TextureDSPContext *c);
  63.  
  64. #endif /* AVCODEC_TEXTUREDSP_H */
  65.