1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* Mesa 3-D graphics library
* Version: 5.1
*
* Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "glheader.h"
#include "imports.h"
#include "context.h"
#include "image.h"
#include "texcompress.h"
#include "texformat.h"
/**
* Get the list of supported internal compression formats.
* \param formats - the results list (may be NULL)
* \return number of formats.
*/
GLuint
_mesa_get_compressed_formats( GLcontext *ctx, GLint *formats )
{
GLuint n = 0;
if (ctx->Extensions.ARB_texture_compression) {
if (ctx->Extensions.TDFX_texture_compression_FXT1) {
if (formats) {
formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX;
formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX;
}
else {
n += 2;
}
}
if (ctx->Extensions.EXT_texture_compression_s3tc) {
if (formats) {
formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
/* Skip this one because it has a restriction (all transparent
* pixels become black). See the texture compressions spec for
* a detailed explanation. This is what NVIDIA does.
formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
*/
formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
}
else {
n += 3;
}
}
}
return n;
}
/**
* Return bytes of storage needed for the given texture size and compressed
* format.
* \param width, height, depth the texture size in texels
* \param texFormat one of the specific compressed format enums
* \return size in bytes, or zero if bad texFormat
*/
GLuint
_mesa_compressed_texture_size( GLcontext *ctx,
GLsizei width, GLsizei height, GLsizei depth,
GLenum format )
{
GLuint size;
switch (format) {
case GL_COMPRESSED_RGB_FXT1_3DFX:
case GL_COMPRESSED_RGBA_FXT1_3DFX:
/* round up to multiple of 4 */
size = ((width + 7) / 8) * ((height + 3) / 4) * 16;
return size;
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
/* round up width, height to next multiple of 4 */
width = (width + 3) & ~3;
height = (height + 3) & ~3;
ASSERT(depth == 1);
/* 8 bytes per 4x4 tile of RGB[A] texels */
size = (width * height * 8) / 16;
/* Textures smaller than 4x4 will effectively be made into 4x4 and
* take 8 bytes.
*/
if (size < 8)
size = 8;
return size;
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
/* round up width, height to next multiple of 4 */
width = (width + 3) & ~3;
height = (height + 3) & ~3;
ASSERT(depth == 1);
/* 16 bytes per 4x4 tile of RGBA texels */
size = width * height; /* simple! */
/* Textures smaller than 4x4 will effectively be made into 4x4 and
* take 16 bytes.
*/
if (size < 16)
size = 16;
return size;
default:
_mesa_problem(ctx, "bad texformat in compressed_texture_size");
return 0;
}
}
/**
* Compute the bytes per row in a compressed texture image.
* We use this for computing the destination address for sub-texture updates.
* \param format one of the specific texture compression formats
* \param width image width in pixels
* \return stride, in bytes, between rows for compressed image
*/
GLint
_mesa_compressed_row_stride(GLenum format, GLsizei width)
{
GLint bytesPerTile, stride;
switch (format) {
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
bytesPerTile = 8;
break;
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
bytesPerTile = 16;
break;
default:
return 0;
}
stride = ((width + 3) / 4) * bytesPerTile;
return stride;
}
/**
* Return the address of the pixel at (col, row, img) in a
* compressed texture image.
* \param col, row, img - image position (3D)
* \param format - compressed image format
* \param width - image width
* \param image - the image address
* \return address of pixel at (row, col)
*/
GLubyte *
_mesa_compressed_image_address(GLint col, GLint row, GLint img,
GLenum format,
GLsizei width, const GLubyte *image)
{
GLint bytesPerTile, stride;
GLubyte *addr;
ASSERT((row & 3) == 0);
ASSERT((col & 3) == 0);
(void) img;
switch (format) {
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
bytesPerTile = 8;
break;
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
bytesPerTile = 16;
break;
default:
return 0;
}
stride = ((width + 3) / 4) * bytesPerTile;
addr = (GLubyte *) image + (row / 4) * stride + (col / 4) * bytesPerTile;
return addr;
}
/*
* \param srcRowStride - source stride, in pixels
*/
void
_mesa_compress_teximage( GLcontext *ctx, GLsizei width, GLsizei height,
GLenum srcFormat, const GLchan *source,
GLint srcRowStride,
const struct gl_texture_format *dstFormat,
GLubyte *dest, GLint dstRowStride )
{
switch (dstFormat->MesaFormat) {
default:
_mesa_problem(ctx, "Bad dstFormat in _mesa_compress_teximage()");
return;
}
}
|
