/*
  * Texture block module
  * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
  *

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * Texture block (4x4) module
  *
  * References:
  *   https://www.opengl.org/wiki/S3_Texture_Compression
  *   https://www.opengl.org/wiki/Red_Green_Texture_Compression
  *   https://msdn.microsoft.com/en-us/library/bb694531%28v=vs.85%29.aspx
  *
  * All functions return how much data has been written or read.
  *
  * Pixel input or output format is always AV_PIX_FMT_RGBA.
  */
 
 #ifndef AVCODEC_TEXTUREDSP_H
 #define AVCODEC_TEXTUREDSP_H
 
 #include <stddef.h>
 #include <stdint.h>
 
 #define TEXTURE_BLOCK_W 4
 #define TEXTURE_BLOCK_H 4
 
 typedef struct TextureDSPContext {

     int (*dxt1_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*dxt1a_block)       (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*dxt2_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*dxt3_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*dxt4_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*dxt5_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*dxt5y_block)       (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*dxt5ys_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*rgtc1s_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*rgtc1u_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);

     int (*rgtc1u_gray_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);

     int (*rgtc1u_alpha_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);

     int (*rgtc2s_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*rgtc2u_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
     int (*dxn3dc_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);

 } TextureDSPContext;
 
 void ff_texturedsp_init(TextureDSPContext *c);
 void ff_texturedspenc_init(TextureDSPContext *c);
 
 #endif /* AVCODEC_TEXTUREDSP_H */