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[mesa.git] / src / mesa / main / texformat.c
1 /* $Id: texformat.c,v 1.18 2002/10/29 20:28:47 brianp Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 3.5
6 *
7 * Copyright (C) 1999-2001 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 * Author:
27 * Gareth Hughes
28 */
29
30 #include "glheader.h"
31 #include "colormac.h"
32 #include "context.h"
33 #include "image.h"
34 #include "imports.h"
35 #include "mmath.h"
36 #include "mtypes.h"
37 #include "texformat.h"
38 #include "teximage.h"
39 #include "texstate.h"
40
41
42 /* Texel fetch routines for all supported formats:
43 */
44 #define DIM 1
45 #include "texformat_tmp.h"
46
47 #define DIM 2
48 #include "texformat_tmp.h"
49
50 #define DIM 3
51 #include "texformat_tmp.h"
52
53 /* Have to have this so the FetchTexel function pointer is never NULL.
54 */
55 static void fetch_null_texel( const struct gl_texture_image *texImage,
56 GLint i, GLint j, GLint k, GLvoid *texel )
57 {
58 GLchan *rgba = (GLchan *) texel;
59 rgba[RCOMP] = 0;
60 rgba[GCOMP] = 0;
61 rgba[BCOMP] = 0;
62 rgba[ACOMP] = 0;
63 }
64
65
66 /* =============================================================
67 * Default GLchan-based formats:
68 */
69
70 const struct gl_texture_format _mesa_texformat_rgba = {
71 MESA_FORMAT_RGBA, /* MesaFormat */
72 GL_RGBA, /* BaseFormat */
73 CHAN_BITS, /* RedBits */
74 CHAN_BITS, /* GreenBits */
75 CHAN_BITS, /* BlueBits */
76 CHAN_BITS, /* AlphaBits */
77 0, /* LuminanceBits */
78 0, /* IntensityBits */
79 0, /* IndexBits */
80 0, /* DepthBits */
81 4 * CHAN_BITS / 8, /* TexelBytes */
82 fetch_1d_texel_rgba, /* FetchTexel1D */
83 fetch_2d_texel_rgba, /* FetchTexel2D */
84 fetch_3d_texel_rgba, /* FetchTexel3D */
85 };
86
87 const struct gl_texture_format _mesa_texformat_rgb = {
88 MESA_FORMAT_RGB, /* MesaFormat */
89 GL_RGB, /* BaseFormat */
90 CHAN_BITS, /* RedBits */
91 CHAN_BITS, /* GreenBits */
92 CHAN_BITS, /* BlueBits */
93 0, /* AlphaBits */
94 0, /* LuminanceBits */
95 0, /* IntensityBits */
96 0, /* IndexBits */
97 0, /* DepthBits */
98 3 * CHAN_BITS / 8, /* TexelBytes */
99 fetch_1d_texel_rgb, /* FetchTexel1D */
100 fetch_2d_texel_rgb, /* FetchTexel2D */
101 fetch_3d_texel_rgb, /* FetchTexel3D */
102 };
103
104 const struct gl_texture_format _mesa_texformat_alpha = {
105 MESA_FORMAT_ALPHA, /* MesaFormat */
106 GL_ALPHA, /* BaseFormat */
107 0, /* RedBits */
108 0, /* GreenBits */
109 0, /* BlueBits */
110 CHAN_BITS, /* AlphaBits */
111 0, /* LuminanceBits */
112 0, /* IntensityBits */
113 0, /* IndexBits */
114 0, /* DepthBits */
115 CHAN_BITS / 8, /* TexelBytes */
116 fetch_1d_texel_alpha, /* FetchTexel1D */
117 fetch_2d_texel_alpha, /* FetchTexel2D */
118 fetch_3d_texel_alpha, /* FetchTexel3D */
119 };
120
121 const struct gl_texture_format _mesa_texformat_luminance = {
122 MESA_FORMAT_LUMINANCE, /* MesaFormat */
123 GL_LUMINANCE, /* BaseFormat */
124 0, /* RedBits */
125 0, /* GreenBits */
126 0, /* BlueBits */
127 0, /* AlphaBits */
128 CHAN_BITS, /* LuminanceBits */
129 0, /* IntensityBits */
130 0, /* IndexBits */
131 0, /* DepthBits */
132 CHAN_BITS / 8, /* TexelBytes */
133 fetch_1d_texel_luminance, /* FetchTexel1D */
134 fetch_2d_texel_luminance, /* FetchTexel2D */
135 fetch_3d_texel_luminance, /* FetchTexel3D */
136 };
137
138 const struct gl_texture_format _mesa_texformat_luminance_alpha = {
139 MESA_FORMAT_LUMINANCE_ALPHA, /* MesaFormat */
140 GL_LUMINANCE_ALPHA, /* BaseFormat */
141 0, /* RedBits */
142 0, /* GreenBits */
143 0, /* BlueBits */
144 CHAN_BITS, /* AlphaBits */
145 CHAN_BITS, /* LuminanceBits */
146 0, /* IntensityBits */
147 0, /* IndexBits */
148 0, /* DepthBits */
149 2 * CHAN_BITS / 8, /* TexelBytes */
150 fetch_1d_texel_luminance_alpha, /* FetchTexel1D */
151 fetch_2d_texel_luminance_alpha, /* FetchTexel2D */
152 fetch_3d_texel_luminance_alpha, /* FetchTexel3D */
153 };
154
155 const struct gl_texture_format _mesa_texformat_intensity = {
156 MESA_FORMAT_INTENSITY, /* MesaFormat */
157 GL_INTENSITY, /* BaseFormat */
158 0, /* RedBits */
159 0, /* GreenBits */
160 0, /* BlueBits */
161 0, /* AlphaBits */
162 0, /* LuminanceBits */
163 CHAN_BITS, /* IntensityBits */
164 0, /* IndexBits */
165 0, /* DepthBits */
166 CHAN_BITS / 8, /* TexelBytes */
167 fetch_1d_texel_intensity, /* FetchTexel1D */
168 fetch_2d_texel_intensity, /* FetchTexel2D */
169 fetch_3d_texel_intensity, /* FetchTexel3D */
170 };
171
172 const struct gl_texture_format _mesa_texformat_color_index = {
173 MESA_FORMAT_COLOR_INDEX, /* MesaFormat */
174 GL_COLOR_INDEX, /* BaseFormat */
175 0, /* RedBits */
176 0, /* GreenBits */
177 0, /* BlueBits */
178 0, /* AlphaBits */
179 0, /* LuminanceBits */
180 0, /* IntensityBits */
181 CHAN_BITS, /* IndexBits */
182 0, /* DepthBits */
183 CHAN_BITS / 8, /* TexelBytes */
184 fetch_1d_texel_color_index, /* FetchTexel1D */
185 fetch_2d_texel_color_index, /* FetchTexel2D */
186 fetch_3d_texel_color_index, /* FetchTexel3D */
187 };
188
189 const struct gl_texture_format _mesa_texformat_depth_component = {
190 MESA_FORMAT_DEPTH_COMPONENT, /* MesaFormat */
191 GL_DEPTH_COMPONENT, /* BaseFormat */
192 0, /* RedBits */
193 0, /* GreenBits */
194 0, /* BlueBits */
195 0, /* AlphaBits */
196 0, /* LuminanceBits */
197 0, /* IntensityBits */
198 0, /* IndexBits */
199 sizeof(GLfloat) * 8, /* DepthBits */
200 sizeof(GLfloat), /* TexelBytes */
201 fetch_1d_texel_depth_component, /* FetchTexel1D */
202 fetch_2d_texel_depth_component, /* FetchTexel2D */
203 fetch_3d_texel_depth_component, /* FetchTexel3D */
204 };
205
206
207 /* =============================================================
208 * Hardware formats:
209 */
210
211 const struct gl_texture_format _mesa_texformat_rgba8888 = {
212 MESA_FORMAT_RGBA8888, /* MesaFormat */
213 GL_RGBA, /* BaseFormat */
214 8, /* RedBits */
215 8, /* GreenBits */
216 8, /* BlueBits */
217 8, /* AlphaBits */
218 0, /* LuminanceBits */
219 0, /* IntensityBits */
220 0, /* IndexBits */
221 0, /* DepthBits */
222 4, /* TexelBytes */
223 fetch_1d_texel_rgba8888, /* FetchTexel1D */
224 fetch_2d_texel_rgba8888, /* FetchTexel2D */
225 fetch_3d_texel_rgba8888, /* FetchTexel3D */
226 };
227
228 const struct gl_texture_format _mesa_texformat_argb8888 = {
229 MESA_FORMAT_ARGB8888, /* MesaFormat */
230 GL_RGBA, /* BaseFormat */
231 8, /* RedBits */
232 8, /* GreenBits */
233 8, /* BlueBits */
234 8, /* AlphaBits */
235 0, /* LuminanceBits */
236 0, /* IntensityBits */
237 0, /* IndexBits */
238 0, /* DepthBits */
239 4, /* TexelBytes */
240 fetch_1d_texel_argb8888, /* FetchTexel1D */
241 fetch_2d_texel_argb8888, /* FetchTexel2D */
242 fetch_3d_texel_argb8888, /* FetchTexel3D */
243 };
244
245 const struct gl_texture_format _mesa_texformat_rgb888 = {
246 MESA_FORMAT_RGB888, /* MesaFormat */
247 GL_RGB, /* BaseFormat */
248 8, /* RedBits */
249 8, /* GreenBits */
250 8, /* BlueBits */
251 0, /* AlphaBits */
252 0, /* LuminanceBits */
253 0, /* IntensityBits */
254 0, /* IndexBits */
255 0, /* DepthBits */
256 3, /* TexelBytes */
257 fetch_1d_texel_rgb888, /* FetchTexel1D */
258 fetch_2d_texel_rgb888, /* FetchTexel2D */
259 fetch_3d_texel_rgb888, /* FetchTexel3D */
260 };
261
262 const struct gl_texture_format _mesa_texformat_rgb565 = {
263 MESA_FORMAT_RGB565, /* MesaFormat */
264 GL_RGB, /* BaseFormat */
265 5, /* RedBits */
266 6, /* GreenBits */
267 5, /* BlueBits */
268 0, /* AlphaBits */
269 0, /* LuminanceBits */
270 0, /* IntensityBits */
271 0, /* IndexBits */
272 0, /* DepthBits */
273 2, /* TexelBytes */
274 fetch_1d_texel_rgb565, /* FetchTexel1D */
275 fetch_2d_texel_rgb565, /* FetchTexel2D */
276 fetch_3d_texel_rgb565, /* FetchTexel3D */
277 };
278
279 const struct gl_texture_format _mesa_texformat_argb4444 = {
280 MESA_FORMAT_ARGB4444, /* MesaFormat */
281 GL_RGBA, /* BaseFormat */
282 4, /* RedBits */
283 4, /* GreenBits */
284 4, /* BlueBits */
285 4, /* AlphaBits */
286 0, /* LuminanceBits */
287 0, /* IntensityBits */
288 0, /* IndexBits */
289 0, /* DepthBits */
290 2, /* TexelBytes */
291 fetch_1d_texel_argb4444, /* FetchTexel1D */
292 fetch_2d_texel_argb4444, /* FetchTexel2D */
293 fetch_3d_texel_argb4444, /* FetchTexel3D */
294 };
295
296 const struct gl_texture_format _mesa_texformat_argb1555 = {
297 MESA_FORMAT_ARGB1555, /* MesaFormat */
298 GL_RGBA, /* BaseFormat */
299 5, /* RedBits */
300 5, /* GreenBits */
301 5, /* BlueBits */
302 1, /* AlphaBits */
303 0, /* LuminanceBits */
304 0, /* IntensityBits */
305 0, /* IndexBits */
306 0, /* DepthBits */
307 2, /* TexelBytes */
308 fetch_1d_texel_argb1555, /* FetchTexel1D */
309 fetch_2d_texel_argb1555, /* FetchTexel2D */
310 fetch_3d_texel_argb1555, /* FetchTexel3D */
311 };
312
313 const struct gl_texture_format _mesa_texformat_al88 = {
314 MESA_FORMAT_AL88, /* MesaFormat */
315 GL_LUMINANCE_ALPHA, /* BaseFormat */
316 0, /* RedBits */
317 0, /* GreenBits */
318 0, /* BlueBits */
319 8, /* AlphaBits */
320 8, /* LuminanceBits */
321 0, /* IntensityBits */
322 0, /* IndexBits */
323 0, /* DepthBits */
324 2, /* TexelBytes */
325 fetch_1d_texel_al88, /* FetchTexel1D */
326 fetch_2d_texel_al88, /* FetchTexel2D */
327 fetch_3d_texel_al88, /* FetchTexel3D */
328 };
329
330 const struct gl_texture_format _mesa_texformat_rgb332 = {
331 MESA_FORMAT_RGB332, /* MesaFormat */
332 GL_RGB, /* BaseFormat */
333 3, /* RedBits */
334 3, /* GreenBits */
335 2, /* BlueBits */
336 0, /* AlphaBits */
337 0, /* LuminanceBits */
338 0, /* IntensityBits */
339 0, /* IndexBits */
340 0, /* DepthBits */
341 1, /* TexelBytes */
342 fetch_1d_texel_rgb332, /* FetchTexel1D */
343 fetch_2d_texel_rgb332, /* FetchTexel2D */
344 fetch_3d_texel_rgb332, /* FetchTexel3D */
345 };
346
347 const struct gl_texture_format _mesa_texformat_a8 = {
348 MESA_FORMAT_A8, /* MesaFormat */
349 GL_ALPHA, /* BaseFormat */
350 0, /* RedBits */
351 0, /* GreenBits */
352 0, /* BlueBits */
353 8, /* AlphaBits */
354 0, /* LuminanceBits */
355 0, /* IntensityBits */
356 0, /* IndexBits */
357 0, /* DepthBits */
358 1, /* TexelBytes */
359 fetch_1d_texel_a8, /* FetchTexel1D */
360 fetch_2d_texel_a8, /* FetchTexel2D */
361 fetch_3d_texel_a8, /* FetchTexel3D */
362 };
363
364 const struct gl_texture_format _mesa_texformat_l8 = {
365 MESA_FORMAT_L8, /* MesaFormat */
366 GL_LUMINANCE, /* BaseFormat */
367 0, /* RedBits */
368 0, /* GreenBits */
369 0, /* BlueBits */
370 0, /* AlphaBits */
371 8, /* LuminanceBits */
372 0, /* IntensityBits */
373 0, /* IndexBits */
374 0, /* DepthBits */
375 1, /* TexelBytes */
376 fetch_1d_texel_l8, /* FetchTexel1D */
377 fetch_2d_texel_l8, /* FetchTexel2D */
378 fetch_3d_texel_l8, /* FetchTexel3D */
379 };
380
381 const struct gl_texture_format _mesa_texformat_i8 = {
382 MESA_FORMAT_I8, /* MesaFormat */
383 GL_INTENSITY, /* BaseFormat */
384 0, /* RedBits */
385 0, /* GreenBits */
386 0, /* BlueBits */
387 0, /* AlphaBits */
388 0, /* LuminanceBits */
389 8, /* IntensityBits */
390 0, /* IndexBits */
391 0, /* DepthBits */
392 1, /* TexelBytes */
393 fetch_1d_texel_i8, /* FetchTexel1D */
394 fetch_2d_texel_i8, /* FetchTexel2D */
395 fetch_3d_texel_i8, /* FetchTexel3D */
396 };
397
398 const struct gl_texture_format _mesa_texformat_ci8 = {
399 MESA_FORMAT_CI8, /* MesaFormat */
400 GL_COLOR_INDEX, /* BaseFormat */
401 0, /* RedBits */
402 0, /* GreenBits */
403 0, /* BlueBits */
404 0, /* AlphaBits */
405 0, /* LuminanceBits */
406 0, /* IntensityBits */
407 8, /* IndexBits */
408 0, /* DepthBits */
409 1, /* TexelBytes */
410 fetch_1d_texel_ci8, /* FetchTexel1D */
411 fetch_2d_texel_ci8, /* FetchTexel2D */
412 fetch_3d_texel_ci8, /* FetchTexel3D */
413 };
414
415 const struct gl_texture_format _mesa_texformat_ycbcr = {
416 MESA_FORMAT_YCBCR, /* MesaFormat */
417 GL_YCBCR_MESA, /* BaseFormat */
418 0, /* RedBits */
419 0, /* GreenBits */
420 0, /* BlueBits */
421 0, /* AlphaBits */
422 0, /* LuminanceBits */
423 0, /* IntensityBits */
424 0, /* IndexBits */
425 0, /* DepthBits */
426 2, /* TexelBytes */
427 fetch_1d_texel_ycbcr, /* FetchTexel1D */
428 fetch_2d_texel_ycbcr, /* FetchTexel2D */
429 fetch_3d_texel_ycbcr, /* FetchTexel3D */
430 };
431
432
433 const struct gl_texture_format _mesa_texformat_ycbcr_rev = {
434 MESA_FORMAT_YCBCR_REV, /* MesaFormat */
435 GL_YCBCR_MESA, /* BaseFormat */
436 0, /* RedBits */
437 0, /* GreenBits */
438 0, /* BlueBits */
439 0, /* AlphaBits */
440 0, /* LuminanceBits */
441 0, /* IntensityBits */
442 0, /* IndexBits */
443 0, /* DepthBits */
444 2, /* TexelBytes */
445 fetch_1d_texel_ycbcr_rev, /* FetchTexel1D */
446 fetch_2d_texel_ycbcr_rev, /* FetchTexel2D */
447 fetch_3d_texel_ycbcr_rev, /* FetchTexel3D */
448 };
449
450
451 /* Big-endian */
452 #if 0
453 const struct gl_texture_format _mesa_texformat_abgr8888 = {
454 MESA_FORMAT_ABGR8888, /* MesaFormat */
455 GL_RGBA, /* BaseFormat */
456 GL_UNSIGNED_INT_8_8_8_8, /* Type */
457 8, /* RedBits */
458 8, /* GreenBits */
459 8, /* BlueBits */
460 8, /* AlphaBits */
461 0, /* LuminanceBits */
462 0, /* IntensityBits */
463 0, /* IndexBits */
464 0, /* DepthBits */
465 4, /* TexelBytes */
466 fetch_1d_texel_abgr8888, /* FetchTexel1D */
467 fetch_2d_texel_abgr8888, /* FetchTexel2D */
468 fetch_3d_texel_abgr8888, /* FetchTexel3D */
469 };
470
471 const struct gl_texture_format _mesa_texformat_bgra8888 = {
472 MESA_FORMAT_BGRA8888, /* MesaFormat */
473 GL_RGBA, /* BaseFormat */
474 GL_UNSIGNED_INT_8_8_8_8, /* Type */
475 8, /* RedBits */
476 8, /* GreenBits */
477 8, /* BlueBits */
478 8, /* AlphaBits */
479 0, /* LuminanceBits */
480 0, /* IntensityBits */
481 0, /* IndexBits */
482 0, /* DepthBits */
483 4, /* TexelBytes */
484 fetch_1d_texel_bgra8888, /* FetchTexel1D */
485 fetch_2d_texel_bgra8888, /* FetchTexel2D */
486 fetch_3d_texel_bgra8888, /* FetchTexel3D */
487 };
488
489 const struct gl_texture_format _mesa_texformat_bgr888 = {
490 MESA_FORMAT_BGR888, /* MesaFormat */
491 GL_RGB, /* BaseFormat */
492 GL_UNSIGNED_BYTE, /* Type */
493 8, /* RedBits */
494 8, /* GreenBits */
495 8, /* BlueBits */
496 0, /* AlphaBits */
497 0, /* LuminanceBits */
498 0, /* IntensityBits */
499 0, /* IndexBits */
500 0, /* DepthBits */
501 3, /* TexelBytes */
502 fetch_1d_texel_bgr888, /* FetchTexel1D */
503 fetch_2d_texel_bgr888, /* FetchTexel2D */
504 fetch_3d_texel_bgr888, /* FetchTexel3D */
505 };
506
507 const struct gl_texture_format _mesa_texformat_bgr565 = {
508 MESA_FORMAT_BGR565, /* MesaFormat */
509 GL_RGB, /* BaseFormat */
510 GL_UNSIGNED_SHORT_5_6_5, /* Type */
511 5, /* RedBits */
512 6, /* GreenBits */
513 5, /* BlueBits */
514 0, /* AlphaBits */
515 0, /* LuminanceBits */
516 0, /* IntensityBits */
517 0, /* IndexBits */
518 0, /* DepthBits */
519 2, /* TexelBytes */
520 fetch_1d_texel_bgr565, /* FetchTexel1D */
521 fetch_2d_texel_bgr565, /* FetchTexel2D */
522 fetch_3d_texel_bgr565, /* FetchTexel3D */
523 };
524
525 const struct gl_texture_format _mesa_texformat_bgra4444 = {
526 MESA_FORMAT_BGRA4444, /* MesaFormat */
527 GL_RGBA, /* BaseFormat */
528 GL_UNSIGNED_SHORT_4_4_4_4_REV, /* Type */
529 4, /* RedBits */
530 4, /* GreenBits */
531 4, /* BlueBits */
532 4, /* AlphaBits */
533 0, /* LuminanceBits */
534 0, /* IntensityBits */
535 0, /* IndexBits */
536 0, /* DepthBits */
537 2, /* TexelBytes */
538 fetch_1d_texel_bgra4444, /* FetchTexel1D */
539 fetch_2d_texel_bgra4444, /* FetchTexel2D */
540 fetch_3d_texel_bgra4444, /* FetchTexel3D */
541 };
542
543 const struct gl_texture_format _mesa_texformat_bgra5551 = {
544 MESA_FORMAT_BGRA5551, /* MesaFormat */
545 GL_RGBA, /* BaseFormat */
546 GL_UNSIGNED_SHORT_1_5_5_5_REV, /* Type */
547 5, /* RedBits */
548 5, /* GreenBits */
549 5, /* BlueBits */
550 1, /* AlphaBits */
551 0, /* LuminanceBits */
552 0, /* IntensityBits */
553 0, /* IndexBits */
554 0, /* DepthBits */
555 2, /* TexelBytes */
556 fetch_1d_texel_bgra1555, /* FetchTexel1D */
557 fetch_2d_texel_bgra1555, /* FetchTexel2D */
558 fetch_3d_texel_bgra1555, /* FetchTexel3D */
559 };
560
561 const struct gl_texture_format _mesa_texformat_la88 = {
562 MESA_FORMAT_LA88, /* MesaFormat */
563 GL_LUMINANCE_ALPHA, /* BaseFormat */
564 GL_UNSIGNED_BYTE, /* Type */
565 0, /* RedBits */
566 0, /* GreenBits */
567 0, /* BlueBits */
568 8, /* AlphaBits */
569 8, /* LuminanceBits */
570 0, /* IntensityBits */
571 0, /* IndexBits */
572 0, /* DepthBits */
573 2, /* TexelBytes */
574 fetch_1d_texel_la88, /* FetchTexel1D */
575 fetch_2d_texel_la88, /* FetchTexel2D */
576 fetch_3d_texel_la88, /* FetchTexel3D */
577 };
578
579 const struct gl_texture_format _mesa_texformat_bgr233 = {
580 MESA_FORMAT_BGR233, /* MesaFormat */
581 GL_RGB, /* BaseFormat */
582 GL_UNSIGNED_BYTE_3_3_2, /* Type */
583 3, /* RedBits */
584 3, /* GreenBits */
585 2, /* BlueBits */
586 0, /* AlphaBits */
587 0, /* LuminanceBits */
588 0, /* IntensityBits */
589 0, /* IndexBits */
590 0, /* DepthBits */
591 1, /* TexelBytes */
592 fetch_1d_texel_bgr233, /* FetchTexel1D */
593 fetch_2d_texel_bgr233, /* FetchTexel2D */
594 fetch_3d_texel_bgr233, /* FetchTexel3D */
595 };
596 #endif
597
598 /* =============================================================
599 * Null format (useful for proxy textures):
600 */
601
602 const struct gl_texture_format _mesa_null_texformat = {
603 -1, /* MesaFormat */
604 0, /* BaseFormat */
605 0, /* RedBits */
606 0, /* GreenBits */
607 0, /* BlueBits */
608 0, /* AlphaBits */
609 0, /* LuminanceBits */
610 0, /* IntensityBits */
611 0, /* IndexBits */
612 0, /* DepthBits */
613 0, /* TexelBytes */
614 fetch_null_texel, /* FetchTexel1D */
615 fetch_null_texel, /* FetchTexel2D */
616 fetch_null_texel, /* FetchTexel3D */
617 };
618
619
620 GLboolean
621 _mesa_is_hardware_tex_format( const struct gl_texture_format *format )
622 {
623 return (format->MesaFormat < MESA_FORMAT_RGBA);
624 }
625
626
627 /* Given an internal texture format (or 1, 2, 3, 4) return a pointer
628 * to a gl_texture_format which which to store the texture.
629 * This is called via ctx->Driver.ChooseTextureFormat().
630 * Hardware drivers typically override this function with a specialized
631 * version.
632 */
633 const struct gl_texture_format *
634 _mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
635 GLenum format, GLenum type )
636 {
637 (void) format;
638 (void) type;
639
640 switch ( internalFormat ) {
641 /* GH: Bias towards GL_RGB, GL_RGBA texture formats. This has
642 * got to be better than sticking them way down the end of this
643 * huge list.
644 */
645 case 4: /* Quake3 uses this... */
646 case GL_RGBA:
647 return &_mesa_texformat_rgba;
648
649 case 3: /* ... and this. */
650 case GL_RGB:
651 return &_mesa_texformat_rgb;
652
653 /* GH: Okay, keep checking as normal. Still test for GL_RGB,
654 * GL_RGBA formats first.
655 */
656 case GL_RGBA2:
657 case GL_RGBA4:
658 case GL_RGB5_A1:
659 case GL_RGBA8:
660 case GL_RGB10_A2:
661 case GL_RGBA12:
662 case GL_RGBA16:
663 return &_mesa_texformat_rgba;
664
665 case GL_R3_G3_B2:
666 case GL_RGB4:
667 case GL_RGB5:
668 case GL_RGB8:
669 case GL_RGB10:
670 case GL_RGB12:
671 case GL_RGB16:
672 return &_mesa_texformat_rgb;
673
674 case GL_ALPHA:
675 case GL_ALPHA4:
676 case GL_ALPHA8:
677 case GL_ALPHA12:
678 case GL_ALPHA16:
679 return &_mesa_texformat_alpha;
680
681 case 1:
682 case GL_LUMINANCE:
683 case GL_LUMINANCE4:
684 case GL_LUMINANCE8:
685 case GL_LUMINANCE12:
686 case GL_LUMINANCE16:
687 return &_mesa_texformat_luminance;
688
689 case 2:
690 case GL_LUMINANCE_ALPHA:
691 case GL_LUMINANCE4_ALPHA4:
692 case GL_LUMINANCE6_ALPHA2:
693 case GL_LUMINANCE8_ALPHA8:
694 case GL_LUMINANCE12_ALPHA4:
695 case GL_LUMINANCE12_ALPHA12:
696 case GL_LUMINANCE16_ALPHA16:
697 return &_mesa_texformat_luminance_alpha;
698
699 case GL_INTENSITY:
700 case GL_INTENSITY4:
701 case GL_INTENSITY8:
702 case GL_INTENSITY12:
703 case GL_INTENSITY16:
704 return &_mesa_texformat_intensity;
705
706 case GL_COLOR_INDEX:
707 case GL_COLOR_INDEX1_EXT:
708 case GL_COLOR_INDEX2_EXT:
709 case GL_COLOR_INDEX4_EXT:
710 case GL_COLOR_INDEX8_EXT:
711 case GL_COLOR_INDEX12_EXT:
712 case GL_COLOR_INDEX16_EXT:
713 return &_mesa_texformat_color_index;
714
715 case GL_DEPTH_COMPONENT:
716 case GL_DEPTH_COMPONENT16_SGIX:
717 case GL_DEPTH_COMPONENT24_SGIX:
718 case GL_DEPTH_COMPONENT32_SGIX:
719 if (!ctx->Extensions.SGIX_depth_texture)
720 _mesa_problem(ctx, "depth format without GL_SGIX_depth_texture");
721 return &_mesa_texformat_depth_component;
722
723 case GL_COMPRESSED_ALPHA_ARB:
724 if (!ctx->Extensions.ARB_texture_compression)
725 _mesa_problem(ctx, "texture compression extension not enabled");
726 return &_mesa_texformat_alpha;
727 case GL_COMPRESSED_LUMINANCE_ARB:
728 if (!ctx->Extensions.ARB_texture_compression)
729 _mesa_problem(ctx, "texture compression extension not enabled");
730 return &_mesa_texformat_luminance;
731 case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
732 if (!ctx->Extensions.ARB_texture_compression)
733 _mesa_problem(ctx, "texture compression extension not enabled");
734 return &_mesa_texformat_luminance_alpha;
735 case GL_COMPRESSED_INTENSITY_ARB:
736 if (!ctx->Extensions.ARB_texture_compression)
737 _mesa_problem(ctx, "texture compression extension not enabled");
738 return &_mesa_texformat_intensity;
739 case GL_COMPRESSED_RGB_ARB:
740 if (!ctx->Extensions.ARB_texture_compression)
741 _mesa_problem(ctx, "texture compression extension not enabled");
742 return &_mesa_texformat_rgb;
743 case GL_COMPRESSED_RGBA_ARB:
744 if (!ctx->Extensions.ARB_texture_compression)
745 _mesa_problem(ctx, "texture compression extension not enabled");
746 return &_mesa_texformat_rgba;
747
748 /* GL_MESA_ycrcr_texture */
749 case GL_YCBCR_MESA:
750 if (type == GL_UNSIGNED_SHORT_8_8_MESA)
751 return &_mesa_texformat_ycbcr;
752 else
753 return &_mesa_texformat_ycbcr_rev;
754
755 default:
756 _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
757 return NULL;
758 }
759 }
760
761
762
763
764 /*
765 * Return the base texture format for the given compressed format
766 * Called via ctx->Driver.BaseCompressedTexFormat().
767 * This function is used by software rasterizers. Hardware drivers
768 * which support texture compression should not use this function but
769 * a specialized function instead.
770 */
771 GLint
772 _mesa_base_compressed_texformat(GLcontext *ctx, GLint intFormat)
773 {
774 switch (intFormat) {
775 case GL_COMPRESSED_ALPHA_ARB:
776 return GL_ALPHA;
777 case GL_COMPRESSED_LUMINANCE_ARB:
778 return GL_LUMINANCE;
779 case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
780 return GL_LUMINANCE_ALPHA;
781 case GL_COMPRESSED_INTENSITY_ARB:
782 return GL_INTENSITY;
783 case GL_COMPRESSED_RGB_ARB:
784 return GL_RGB;
785 case GL_COMPRESSED_RGBA_ARB:
786 return GL_RGBA;
787 default:
788 return -1; /* not a recognized compressed format */
789 }
790 }