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#include "avcodec.h"
43
44#define TEXTURE_BLOCK_W 4
45#define TEXTURE_BLOCK_H 4
46
47typedef struct TextureDSPContext {
48    int (*dxt1_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
49    int (*dxt1a_block)       (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
50    int (*dxt2_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
51    int (*dxt3_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
52    int (*dxt4_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
53    int (*dxt5_block)        (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
54    int (*dxt5y_block)       (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
55    int (*dxt5ys_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
56    int (*rgtc1s_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
57    int (*rgtc1u_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
58    int (*rgtc1u_gray_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
59    int (*rgtc1u_alpha_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
60    int (*rgtc2s_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
61    int (*rgtc2u_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
62    int (*dxn3dc_block)      (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
63} TextureDSPContext;
64
65typedef struct TextureDSPThreadContext {
66    union {
67        const uint8_t *in;       // Input frame data
68        uint8_t *out;            // Output frame data
69    } frame_data;
70    ptrdiff_t stride;            // Frame linesize
71    union {
72        const uint8_t *in;       // Compressed texture for decompression
73        uint8_t *out;            // Compressed texture of compression
74    } tex_data;
75    int tex_ratio;               // Number of compressed bytes in a texture block
76    int raw_ratio;               // Number bytes in a line of a raw block
77    int slice_count;             // Number of slices for threaded operations
78
79    /* Pointer to the selected compress or decompress function. */
80    int (*tex_funct)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
81} TextureDSPThreadContext;
82
83void ff_texturedsp_init(TextureDSPContext *c);
84void ff_texturedspenc_init(TextureDSPContext *c);
85
86int ff_texturedsp_decompress_thread(AVCodecContext *avctx, void *arg, int slice, int thread_nb);
87int ff_texturedsp_compress_thread(AVCodecContext *avctx, void *arg, int slice, int thread_nb);
88
89#endif /* AVCODEC_TEXTUREDSP_H */
90