1 /*
2  * Mesa 3-D graphics library
3  *
4  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included
14  * in all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  */
24 
25 #ifndef TEXCOMPRESS_H
26 #define TEXCOMPRESS_H
27 
28 #include "formats.h"
29 #include "glheader.h"
30 
31 struct gl_context;
32 
33 extern GLenum
34 _mesa_gl_compressed_format_base_format(GLenum format);
35 
36 extern GLuint
37 _mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats);
38 
39 extern mesa_format
40 _mesa_glenum_to_compressed_format(GLenum format);
41 
42 extern GLenum
43 _mesa_compressed_format_to_glenum(struct gl_context *ctx, mesa_format mesaFormat);
44 
45 extern GLubyte *
46 _mesa_compressed_image_address(GLint col, GLint row, GLint img,
47                                mesa_format mesaFormat,
48                                GLsizei width, const GLubyte *image);
49 
50 
51 /** A function to fetch one texel from a compressed texture */
52 typedef void (*compressed_fetch_func)(const GLubyte *map,
53                                       GLint rowStride,
54                                       GLint i, GLint j,
55                                       GLfloat *texel);
56 
57 extern compressed_fetch_func
58 _mesa_get_compressed_fetch_func(mesa_format format);
59 
60 
61 extern void
62 _mesa_decompress_image(mesa_format format, GLuint width, GLuint height,
63                        const GLubyte *src, GLint srcRowStride,
64                        GLfloat *dest);
65 
66 #endif /* TEXCOMPRESS_H */
67