Subversion Repositories shark

Rev

Rev 55 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
55 pj 1
/* $Id: texcompress.c,v 1.1 2003-02-28 11:42:04 pj Exp $ */
2
 
3
/*
4
 * Mesa 3-D graphics library
5
 * Version:  4.1
6
 *
7
 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
8
 *
9
 * Permission is hereby granted, free of charge, to any person obtaining a
10
 * copy of this software and associated documentation files (the "Software"),
11
 * to deal in the Software without restriction, including without limitation
12
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13
 * and/or sell copies of the Software, and to permit persons to whom the
14
 * Software is furnished to do so, subject to the following conditions:
15
 *
16
 * The above copyright notice and this permission notice shall be included
17
 * in all copies or substantial portions of the Software.
18
 *
19
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
 */
26
 
27
 
28
#include "glheader.h"
29
#include "imports.h"
30
#include "context.h"
31
#include "image.h"
32
#include "texcompress.h"
33
#include "texformat.h"
34
 
35
 
36
/**
37
 * Get the list of supported internal compression formats.
38
 * \param formats - the results list (may be NULL)
39
 * \return number of formats.
40
 */
41
GLuint
42
_mesa_get_compressed_formats( GLcontext *ctx, GLint *formats )
43
{
44
   GLuint n = 0;
45
   if (ctx->Extensions.ARB_texture_compression) {
46
      if (ctx->Extensions.TDFX_texture_compression_FXT1) {
47
         if (formats) {
48
            formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX;
49
            formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX;
50
         }
51
         else {
52
            n += 4;
53
         }
54
      }
55
   }
56
   return n;
57
}
58
 
59
 
60
 
61
/**
62
 * Return bytes of storage needed for the given texture size and compressed
63
 * format.
64
 * \param width, height, depth - texture size in texels
65
 * \param texFormat - one of the compressed format enums
66
 * \return size in bytes, or zero if bad texFormat
67
 */
68
GLuint
69
_mesa_compressed_texture_size( GLcontext *ctx,
70
                               GLsizei width, GLsizei height, GLsizei depth,
71
                               GLenum format )
72
{
73
   GLuint size;
74
 
75
   switch (format) {
76
   case GL_COMPRESSED_RGB_FXT1_3DFX:
77
   case GL_COMPRESSED_RGBA_FXT1_3DFX:
78
      /* round up to multiple of 4 */
79
      size = ((width + 7) / 8) * ((height + 3) / 4) * 16;
80
      return size;
81
   default:
82
      _mesa_problem(ctx, "bad texformat in compressed_texture_size");
83
      return 0;
84
   }
85
}
86
 
87
 
88
/*
89
 * Compute the bytes per row in a compressed texture image.
90
 */
91
GLint
92
_mesa_compressed_row_stride(GLenum format, GLsizei width)
93
{
94
   GLint bytesPerTile, stride;
95
 
96
   switch (format) {
97
   default:
98
      return 0;
99
   }
100
 
101
   stride = ((width + 3) / 4) * bytesPerTile;
102
   return stride;
103
}
104
 
105
 
106
/*
107
 * Return the address of the pixel at (col, row, img) in a
108
 * compressed texture image.
109
 * \param col, row, img - image position (3D)
110
 * \param format - compressed image format
111
 * \param width - image width
112
 * \param image - the image address
113
 * \return address of pixel at (row, col)
114
 */
115
GLubyte *
116
_mesa_compressed_image_address(GLint col, GLint row, GLint img,
117
                               GLenum format,
118
                               GLsizei width, const GLubyte *image)
119
{
120
   GLint bytesPerTile, stride;
121
   GLubyte *addr;
122
 
123
   ASSERT((row & 3) == 0);
124
   ASSERT((col & 3) == 0);
125
   (void) img;
126
 
127
   switch (format) {
128
   default:
129
      return 0;
130
   }
131
 
132
   stride = ((width + 3) / 4) * bytesPerTile;
133
 
134
   addr = (GLubyte *) image + (row / 4) * stride + (col / 4) * bytesPerTile;
135
   return addr;
136
}
137
 
138
 
139
 
140
/*
141
 * \param srcRowStride - source stride, in pixels
142
 */
143
void
144
_mesa_compress_teximage( GLcontext *ctx, GLsizei width, GLsizei height,
145
                         GLenum srcFormat, const GLchan *source,
146
                         GLint srcRowStride,
147
                         const struct gl_texture_format *dstFormat,
148
                         GLubyte *dest, GLint dstRowStride )
149
{
150
   switch (dstFormat->MesaFormat) {
151
   default:
152
      _mesa_problem(ctx, "Bad dstFormat in _mesa_compress_teximage()");
153
      return;
154
   }
155
}