summaryrefslogtreecommitdiffstats
path: root/src/mesa/main/texformat.c
blob: 1a374e7bee51ecffb144c5322c3d6ed6e7e7a411 (plain)
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
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
/*
 * Mesa 3-D graphics library
 * Version:  7.7
 *
 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
 * Copyright (c) 2008-2009 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 texformat.c
 * Texture formats.
 *
 * \author Gareth Hughes
 * \author Brian Paul
 */


#include "context.h"
#include "texcompress.h"
#include "texcompress_fxt1.h"
#include "texcompress_s3tc.h"
#include "texformat.h"


/**
 * Choose an appropriate texture format given the format, type and
 * internalFormat parameters passed to glTexImage().
 *
 * \param ctx  the GL context.
 * \param internalFormat  user's prefered internal texture format.
 * \param format  incoming image pixel format.
 * \param type  incoming image data type.
 *
 * \return a pointer to a gl_texture_format object which describes the
 * choosen texture format, or NULL on failure.
 * 
 * This is called via dd_function_table::ChooseTextureFormat.  Hardware drivers
 * will typically override this function with a specialized version.
 */
gl_format
_mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
                         GLenum format, GLenum type )
{
   (void) format;
   (void) type;

   switch (internalFormat) {
      /* RGBA formats */
      case 4:
      case GL_RGBA:
      case GL_RGB10_A2:
      case GL_RGBA12:
      case GL_RGBA16:
      case GL_RGBA8:
         return MESA_FORMAT_RGBA8888;
      case GL_RGB5_A1:
         return MESA_FORMAT_ARGB1555;
      case GL_RGBA2:
         return MESA_FORMAT_ARGB4444_REV; /* just to test another format*/
      case GL_RGBA4:
         return MESA_FORMAT_ARGB4444;

      /* RGB formats */
      case 3:
      case GL_RGB:
      case GL_RGB10:
      case GL_RGB12:
      case GL_RGB16:
      case GL_RGB8:
         return MESA_FORMAT_RGB888;
      case GL_R3_G3_B2:
         return MESA_FORMAT_RGB332;
      case GL_RGB4:
         return MESA_FORMAT_RGB565_REV; /* just to test another format */
      case GL_RGB5:
         return MESA_FORMAT_RGB565;

      /* Alpha formats */
      case GL_ALPHA:
      case GL_ALPHA4:
      case GL_ALPHA12:
      case GL_ALPHA16:
      case GL_ALPHA8:
         return MESA_FORMAT_A8;

      /* Luminance formats */
      case 1:
      case GL_LUMINANCE:
      case GL_LUMINANCE4:
      case GL_LUMINANCE12:
      case GL_LUMINANCE16:
      case GL_LUMINANCE8:
         return MESA_FORMAT_L8;

      /* Luminance/Alpha formats */
      case 2:
      case GL_LUMINANCE_ALPHA:
      case GL_LUMINANCE4_ALPHA4:
      case GL_LUMINANCE6_ALPHA2:
      case GL_LUMINANCE8_ALPHA8:
         return MESA_FORMAT_AL88;

      case GL_LUMINANCE12_ALPHA4:
      case GL_LUMINANCE12_ALPHA12:
      case GL_LUMINANCE16_ALPHA16:
         return MESA_FORMAT_AL1616;

      case GL_INTENSITY:
      case GL_INTENSITY4:
      case GL_INTENSITY12:
      case GL_INTENSITY16:
      case GL_INTENSITY8:
         return MESA_FORMAT_I8;

      case GL_COLOR_INDEX:
      case GL_COLOR_INDEX1_EXT:
      case GL_COLOR_INDEX2_EXT:
      case GL_COLOR_INDEX4_EXT:
      case GL_COLOR_INDEX12_EXT:
      case GL_COLOR_INDEX16_EXT:
      case GL_COLOR_INDEX8_EXT:
         return MESA_FORMAT_CI8;

      default:
         ; /* fallthrough */
   }

   if (ctx->Extensions.ARB_depth_texture) {
      switch (internalFormat) {
         case GL_DEPTH_COMPONENT:
         case GL_DEPTH_COMPONENT24:
         case GL_DEPTH_COMPONENT32:
            return MESA_FORMAT_Z32;
         case GL_DEPTH_COMPONENT16:
            return MESA_FORMAT_Z16;
         default:
            ; /* fallthrough */
      }
   }

   switch (internalFormat) {
      case GL_COMPRESSED_ALPHA_ARB:
         return MESA_FORMAT_A8;
      case GL_COMPRESSED_LUMINANCE_ARB:
         return MESA_FORMAT_L8;
      case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
         return MESA_FORMAT_AL88;
      case GL_COMPRESSED_INTENSITY_ARB:
         return MESA_FORMAT_I8;
      case GL_COMPRESSED_RGB_ARB:
         if (ctx->Extensions.EXT_texture_compression_s3tc ||
             ctx->Extensions.S3_s3tc)
            return MESA_FORMAT_RGB_DXT1;
         if (ctx->Extensions.TDFX_texture_compression_FXT1)
            return MESA_FORMAT_RGB_FXT1;
         return MESA_FORMAT_RGB888;
      case GL_COMPRESSED_RGBA_ARB:
         if (ctx->Extensions.EXT_texture_compression_s3tc ||
             ctx->Extensions.S3_s3tc)
            return MESA_FORMAT_RGBA_DXT3; /* Not rgba_dxt1, see spec */
         if (ctx->Extensions.TDFX_texture_compression_FXT1)
            return MESA_FORMAT_RGBA_FXT1;
         return MESA_FORMAT_RGBA8888;
      default:
         ; /* fallthrough */
   }

   if (ctx->Extensions.MESA_ycbcr_texture) {
      if (internalFormat == GL_YCBCR_MESA) {
         if (type == GL_UNSIGNED_SHORT_8_8_MESA)
            return MESA_FORMAT_YCBCR;
         else
            return MESA_FORMAT_YCBCR_REV;
      }
   }

#if FEATURE_texture_fxt1
   if (ctx->Extensions.TDFX_texture_compression_FXT1) {
      switch (internalFormat) {
         case GL_COMPRESSED_RGB_FXT1_3DFX:
            return MESA_FORMAT_RGB_FXT1;
         case GL_COMPRESSED_RGBA_FXT1_3DFX:
            return MESA_FORMAT_RGBA_FXT1;
         default:
            ; /* fallthrough */
      }
   }
#endif

#if FEATURE_texture_s3tc
   if (ctx->Extensions.EXT_texture_compression_s3tc) {
      switch (internalFormat) {
         case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
            return MESA_FORMAT_RGB_DXT1;
         case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
            return MESA_FORMAT_RGBA_DXT1;
         case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
            return MESA_FORMAT_RGBA_DXT3;
         case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
            return MESA_FORMAT_RGBA_DXT5;
         default:
            ; /* fallthrough */
      }
   }

   if (ctx->Extensions.S3_s3tc) {
      switch (internalFormat) {
         case GL_RGB_S3TC:
         case GL_RGB4_S3TC:
            return MESA_FORMAT_RGB_DXT1;
         case GL_RGBA_S3TC:
         case GL_RGBA4_S3TC:
            return MESA_FORMAT_RGBA_DXT3;
         default:
            ; /* fallthrough */
      }
   }
#endif

   if (ctx->Extensions.ARB_texture_float) {
      switch (internalFormat) {
         case GL_ALPHA16F_ARB:
            return MESA_FORMAT_ALPHA_FLOAT16;
         case GL_ALPHA32F_ARB:
            return MESA_FORMAT_ALPHA_FLOAT32;
         case GL_LUMINANCE16F_ARB:
            return MESA_FORMAT_LUMINANCE_FLOAT16;
         case GL_LUMINANCE32F_ARB:
            return MESA_FORMAT_LUMINANCE_FLOAT32;
         case GL_LUMINANCE_ALPHA16F_ARB:
            return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16;
         case GL_LUMINANCE_ALPHA32F_ARB:
            return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32;
         case GL_INTENSITY16F_ARB:
            return MESA_FORMAT_INTENSITY_FLOAT16;
         case GL_INTENSITY32F_ARB:
            return MESA_FORMAT_INTENSITY_FLOAT32;
         case GL_RGB16F_ARB:
            return MESA_FORMAT_RGB_FLOAT16;
         case GL_RGB32F_ARB:
            return MESA_FORMAT_RGB_FLOAT32;
         case GL_RGBA16F_ARB:
            return MESA_FORMAT_RGBA_FLOAT16;
         case GL_RGBA32F_ARB:
            return MESA_FORMAT_RGBA_FLOAT32;
         default:
            ; /* fallthrough */
      }
   }

   if (ctx->Extensions.EXT_packed_depth_stencil) {
      switch (internalFormat) {
         case GL_DEPTH_STENCIL_EXT:
         case GL_DEPTH24_STENCIL8_EXT:
            return MESA_FORMAT_Z24_S8;
         default:
            ; /* fallthrough */
      }
   }

   if (ctx->Extensions.ATI_envmap_bumpmap) {
      switch (internalFormat) {
         case GL_DUDV_ATI:
         case GL_DU8DV8_ATI:
            return MESA_FORMAT_DUDV8;
         default:
            ; /* fallthrough */
      }
   }

   if (ctx->Extensions.MESA_texture_signed_rgba) {
      switch (internalFormat) {
         case GL_RGBA_SNORM:
         case GL_RGBA8_SNORM:
            return MESA_FORMAT_SIGNED_RGBA8888;
         default:
            ; /* fallthrough */
      }
   }


#if FEATURE_EXT_texture_sRGB
   if (ctx->Extensions.EXT_texture_sRGB) {
      switch (internalFormat) {
         case GL_SRGB_EXT:
         case GL_SRGB8_EXT:
            return MESA_FORMAT_SRGB8;
         case GL_SRGB_ALPHA_EXT:
         case GL_SRGB8_ALPHA8_EXT:
            return MESA_FORMAT_SRGBA8;
         case GL_SLUMINANCE_EXT:
         case GL_SLUMINANCE8_EXT:
            return MESA_FORMAT_SL8;
         case GL_SLUMINANCE_ALPHA_EXT:
         case GL_SLUMINANCE8_ALPHA8_EXT:
            return MESA_FORMAT_SLA8;
         case GL_COMPRESSED_SLUMINANCE_EXT:
            return MESA_FORMAT_SL8;
         case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
            return MESA_FORMAT_SLA8;
         case GL_COMPRESSED_SRGB_EXT:
#if FEATURE_texture_s3tc
            if (ctx->Extensions.EXT_texture_compression_s3tc)
               return MESA_FORMAT_SRGB_DXT1;
#endif
            return MESA_FORMAT_SRGB8;
         case GL_COMPRESSED_SRGB_ALPHA_EXT:
#if FEATURE_texture_s3tc
            if (ctx->Extensions.EXT_texture_compression_s3tc)
               return MESA_FORMAT_SRGBA_DXT3; /* Not srgba_dxt1, see spec */
#endif
            return MESA_FORMAT_SRGBA8;
#if FEATURE_texture_s3tc
         case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
            if (ctx->Extensions.EXT_texture_compression_s3tc)
               return MESA_FORMAT_SRGB_DXT1;
            break;
         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
            if (ctx->Extensions.EXT_texture_compression_s3tc)
               return MESA_FORMAT_SRGBA_DXT1;
            break;
         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
            if (ctx->Extensions.EXT_texture_compression_s3tc)
               return MESA_FORMAT_SRGBA_DXT3;
            break;
         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
            if (ctx->Extensions.EXT_texture_compression_s3tc)
               return MESA_FORMAT_SRGBA_DXT5;
            break;
#endif
         default:
            ; /* fallthrough */
      }
   }
#endif /* FEATURE_EXT_texture_sRGB */

   _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
   return MESA_FORMAT_NONE;
}