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/*
* 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;
typedef struct TextureDSPEncContext {
int (*dxt1_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 (*dxt5ys_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
} TextureDSPEncContext;
typedef struct TextureDSPThreadContext {
union {
const uint8_t *in; // Input frame data
uint8_t *out; // Output frame data
} frame_data;
ptrdiff_t stride; // Frame linesize
int width, height; // Frame width / height
union {
const uint8_t *in; // Compressed texture for decompression
uint8_t *out; // Compressed texture of compression
} tex_data;
int tex_ratio; // Number of compressed bytes in a texture block
int raw_ratio; // Number bytes in a line of a raw block
int slice_count; // Number of slices for threaded operations
/* Pointer to the selected compress or decompress function. */
int (*tex_funct)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
} TextureDSPThreadContext;
void ff_texturedsp_init(TextureDSPContext *c);
void ff_texturedspenc_init(TextureDSPEncContext *c);
struct AVCodecContext;
int ff_texturedsp_exec_decompress_threads(struct AVCodecContext *avctx,
TextureDSPThreadContext *ctx);
int ff_texturedsp_exec_compress_threads(struct AVCodecContext *avctx,
TextureDSPThreadContext *ctx);
#endif /* AVCODEC_TEXTUREDSP_H */
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