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
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
|
/*
* Mesa 3-D graphics library
* Version: 6.5.1
*
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
* Copyright (c) 2008 VMware, Inc.
*
* 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.
*/
/**
* \file texcompress.c
* Helper functions for texture compression.
*/
#include "glheader.h"
#include "imports.h"
#include "colormac.h"
#include "formats.h"
#include "mfeatures.h"
#include "mtypes.h"
#include "texcompress.h"
/**
* Return list of (and count of) all specific texture compression
* formats that are supported.
*
* \param ctx the GL context
* \param formats the resulting format list (may be NULL).
* \param all if true return all formats, even those with some kind
* of restrictions/limitations (See GL_ARB_texture_compression
* spec for more info).
*
* \return number of formats.
*/
GLuint
_mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats, GLboolean all)
{
GLuint n = 0;
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;
}
}
/* don't return RGTC - ARB_texture_compression_rgtc query 19 */
if (ctx->Extensions.EXT_texture_compression_s3tc) {
if (formats) {
formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
/* This format has some restrictions/limitations and so should
* not be returned via the GL_COMPRESSED_TEXTURE_FORMATS query.
* Specifically, all transparent pixels become black. NVIDIA
* omits this format too.
*/
if (all)
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;
if (all)
n += 1;
}
}
if (ctx->Extensions.S3_s3tc) {
if (formats) {
formats[n++] = GL_RGB_S3TC;
formats[n++] = GL_RGB4_S3TC;
formats[n++] = GL_RGBA_S3TC;
formats[n++] = GL_RGBA4_S3TC;
}
else {
n += 4;
}
}
#if FEATURE_EXT_texture_sRGB
if (ctx->Extensions.EXT_texture_sRGB) {
if (formats) {
formats[n++] = GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
}
else {
n += 4;
}
}
#endif /* FEATURE_EXT_texture_sRGB */
return n;
#if FEATURE_ES1 || FEATURE_ES2
if (formats) {
formats[n++] = GL_PALETTE4_RGB8_OES;
formats[n++] = GL_PALETTE4_RGBA8_OES;
formats[n++] = GL_PALETTE4_R5_G6_B5_OES;
formats[n++] = GL_PALETTE4_RGBA4_OES;
formats[n++] = GL_PALETTE4_RGB5_A1_OES;
formats[n++] = GL_PALETTE8_RGB8_OES;
formats[n++] = GL_PALETTE8_RGBA8_OES;
formats[n++] = GL_PALETTE8_R5_G6_B5_OES;
formats[n++] = GL_PALETTE8_RGBA4_OES;
formats[n++] = GL_PALETTE8_RGB5_A1_OES;
}
else {
n += 10;
}
#endif
}
/**
* Convert a compressed MESA_FORMAT_x to a GLenum.
*/
gl_format
_mesa_glenum_to_compressed_format(GLenum format)
{
switch (format) {
case GL_COMPRESSED_RGB_FXT1_3DFX:
return MESA_FORMAT_RGB_FXT1;
case GL_COMPRESSED_RGBA_FXT1_3DFX:
return MESA_FORMAT_RGBA_FXT1;
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_RGB_S3TC:
return MESA_FORMAT_RGB_DXT1;
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_RGB4_S3TC:
return MESA_FORMAT_RGBA_DXT1;
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_RGBA_S3TC:
return MESA_FORMAT_RGBA_DXT3;
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
case GL_RGBA4_S3TC:
return MESA_FORMAT_RGBA_DXT5;
case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
return MESA_FORMAT_SRGB_DXT1;
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
return MESA_FORMAT_SRGBA_DXT1;
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
return MESA_FORMAT_SRGBA_DXT3;
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
return MESA_FORMAT_SRGBA_DXT5;
case GL_COMPRESSED_RED_RGTC1:
return MESA_FORMAT_RED_RGTC1;
case GL_COMPRESSED_SIGNED_RED_RGTC1:
return MESA_FORMAT_SIGNED_RED_RGTC1;
case GL_COMPRESSED_RG_RGTC2:
return MESA_FORMAT_RG_RGTC2;
case GL_COMPRESSED_SIGNED_RG_RGTC2:
return MESA_FORMAT_SIGNED_RG_RGTC2;
case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
return MESA_FORMAT_L_LATC1;
case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
return MESA_FORMAT_SIGNED_L_LATC1;
case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
return MESA_FORMAT_LA_LATC2;
case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
return MESA_FORMAT_SIGNED_LA_LATC2;
default:
return MESA_FORMAT_NONE;
}
}
/**
* Given a compressed MESA_FORMAT_x value, return the corresponding
* GLenum for that format.
* This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT)
* which must return the specific texture format used when the user might
* have originally specified a generic compressed format in their
* glTexImage2D() call.
* For non-compressed textures, we always return the user-specified
* internal format unchanged.
*/
GLenum
_mesa_compressed_format_to_glenum(struct gl_context *ctx, GLuint mesaFormat)
{
switch (mesaFormat) {
#if FEATURE_texture_fxt1
case MESA_FORMAT_RGB_FXT1:
return GL_COMPRESSED_RGB_FXT1_3DFX;
case MESA_FORMAT_RGBA_FXT1:
return GL_COMPRESSED_RGBA_FXT1_3DFX;
#endif
#if FEATURE_texture_s3tc
case MESA_FORMAT_RGB_DXT1:
return GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
case MESA_FORMAT_RGBA_DXT1:
return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
case MESA_FORMAT_RGBA_DXT3:
return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
case MESA_FORMAT_RGBA_DXT5:
return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
#if FEATURE_EXT_texture_sRGB
case MESA_FORMAT_SRGB_DXT1:
return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
case MESA_FORMAT_SRGBA_DXT1:
return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
case MESA_FORMAT_SRGBA_DXT3:
return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
case MESA_FORMAT_SRGBA_DXT5:
return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
#endif
#endif
case MESA_FORMAT_RED_RGTC1:
return GL_COMPRESSED_RED_RGTC1;
case MESA_FORMAT_SIGNED_RED_RGTC1:
return GL_COMPRESSED_SIGNED_RED_RGTC1;
case MESA_FORMAT_RG_RGTC2:
return GL_COMPRESSED_RG_RGTC2;
case MESA_FORMAT_SIGNED_RG_RGTC2:
return GL_COMPRESSED_SIGNED_RG_RGTC2;
case MESA_FORMAT_L_LATC1:
return GL_COMPRESSED_LUMINANCE_LATC1_EXT;
case MESA_FORMAT_SIGNED_L_LATC1:
return GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT;
case MESA_FORMAT_LA_LATC2:
return GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT;
case MESA_FORMAT_SIGNED_LA_LATC2:
return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT;
default:
_mesa_problem(ctx, "Unexpected mesa texture format in"
" _mesa_compressed_format_to_glenum()");
return 0;
}
}
/*
* Return the address of the pixel at (col, row, img) in a
* compressed texture image.
* \param col, row, img - image position (3D), should be a multiple of the
* format's block size.
* \param format - compressed image format
* \param width - image width (stride) in pixels
* \param image - the image address
* \return address of pixel at (row, col, img)
*/
GLubyte *
_mesa_compressed_image_address(GLint col, GLint row, GLint img,
gl_format mesaFormat,
GLsizei width, const GLubyte *image)
{
/* XXX only 2D images implemented, not 3D */
const GLuint blockSize = _mesa_get_format_bytes(mesaFormat);
GLuint bw, bh;
GLint offset;
_mesa_get_format_block_size(mesaFormat, &bw, &bh);
ASSERT(col % bw == 0);
ASSERT(row % bh == 0);
offset = ((width + bw - 1) / bw) * (row / bh) + col / bw;
offset *= blockSize;
return (GLubyte *) image + offset;
}
|
