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Merge remote branch 'origin/master' into pipe-video
[mesa.git] / src / mesa / main / image.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.5
4 *
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 /**
28 * \file image.c
29 * Image handling.
30 */
31
32
33 #include "glheader.h"
34 #include "colormac.h"
35 #include "image.h"
36 #include "imports.h"
37 #include "macros.h"
38
39
40 /**
41 * NOTE:
42 * Normally, BYTE_TO_FLOAT(0) returns 0.00392 That causes problems when
43 * we later convert the float to a packed integer value (such as for
44 * GL_RGB5_A1) because we'll wind up with a non-zero value.
45 *
46 * We redefine the macros here so zero is handled correctly.
47 */
48 #undef BYTE_TO_FLOAT
49 #define BYTE_TO_FLOAT(B) ((B) == 0 ? 0.0F : ((2.0F * (B) + 1.0F) * (1.0F/255.0F)))
50
51 #undef SHORT_TO_FLOAT
52 #define SHORT_TO_FLOAT(S) ((S) == 0 ? 0.0F : ((2.0F * (S) + 1.0F) * (1.0F/65535.0F)))
53
54
55
56 /** Compute ceiling of integer quotient of A divided by B. */
57 #define CEILING( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
58
59
60 /**
61 * \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.
62 */
63 GLboolean
64 _mesa_type_is_packed(GLenum type)
65 {
66 switch (type) {
67 case GL_UNSIGNED_BYTE_3_3_2:
68 case GL_UNSIGNED_BYTE_2_3_3_REV:
69 case GL_UNSIGNED_SHORT_5_6_5:
70 case GL_UNSIGNED_SHORT_5_6_5_REV:
71 case GL_UNSIGNED_SHORT_4_4_4_4:
72 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
73 case GL_UNSIGNED_SHORT_5_5_5_1:
74 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
75 case GL_UNSIGNED_INT_8_8_8_8:
76 case GL_UNSIGNED_INT_8_8_8_8_REV:
77 case GL_UNSIGNED_INT_10_10_10_2:
78 case GL_UNSIGNED_INT_2_10_10_10_REV:
79 case GL_UNSIGNED_SHORT_8_8_MESA:
80 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
81 case GL_UNSIGNED_INT_24_8_EXT:
82 return GL_TRUE;
83 }
84
85 return GL_FALSE;
86 }
87
88
89
90 /**
91 * Flip the order of the 2 bytes in each word in the given array.
92 *
93 * \param p array.
94 * \param n number of words.
95 */
96 void
97 _mesa_swap2( GLushort *p, GLuint n )
98 {
99 GLuint i;
100 for (i = 0; i < n; i++) {
101 p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
102 }
103 }
104
105
106
107 /*
108 * Flip the order of the 4 bytes in each word in the given array.
109 */
110 void
111 _mesa_swap4( GLuint *p, GLuint n )
112 {
113 GLuint i, a, b;
114 for (i = 0; i < n; i++) {
115 b = p[i];
116 a = (b >> 24)
117 | ((b >> 8) & 0xff00)
118 | ((b << 8) & 0xff0000)
119 | ((b << 24) & 0xff000000);
120 p[i] = a;
121 }
122 }
123
124
125 /**
126 * Get the size of a GL data type.
127 *
128 * \param type GL data type.
129 *
130 * \return the size, in bytes, of the given data type, 0 if a GL_BITMAP, or -1
131 * if an invalid type enum.
132 */
133 GLint
134 _mesa_sizeof_type( GLenum type )
135 {
136 switch (type) {
137 case GL_BITMAP:
138 return 0;
139 case GL_UNSIGNED_BYTE:
140 return sizeof(GLubyte);
141 case GL_BYTE:
142 return sizeof(GLbyte);
143 case GL_UNSIGNED_SHORT:
144 return sizeof(GLushort);
145 case GL_SHORT:
146 return sizeof(GLshort);
147 case GL_UNSIGNED_INT:
148 return sizeof(GLuint);
149 case GL_INT:
150 return sizeof(GLint);
151 case GL_FLOAT:
152 return sizeof(GLfloat);
153 case GL_DOUBLE:
154 return sizeof(GLdouble);
155 case GL_HALF_FLOAT_ARB:
156 return sizeof(GLhalfARB);
157 default:
158 return -1;
159 }
160 }
161
162
163 /**
164 * Same as _mesa_sizeof_type() but also accepting the packed pixel
165 * format data types.
166 */
167 GLint
168 _mesa_sizeof_packed_type( GLenum type )
169 {
170 switch (type) {
171 case GL_BITMAP:
172 return 0;
173 case GL_UNSIGNED_BYTE:
174 return sizeof(GLubyte);
175 case GL_BYTE:
176 return sizeof(GLbyte);
177 case GL_UNSIGNED_SHORT:
178 return sizeof(GLushort);
179 case GL_SHORT:
180 return sizeof(GLshort);
181 case GL_UNSIGNED_INT:
182 return sizeof(GLuint);
183 case GL_INT:
184 return sizeof(GLint);
185 case GL_HALF_FLOAT_ARB:
186 return sizeof(GLhalfARB);
187 case GL_FLOAT:
188 return sizeof(GLfloat);
189 case GL_UNSIGNED_BYTE_3_3_2:
190 return sizeof(GLubyte);
191 case GL_UNSIGNED_BYTE_2_3_3_REV:
192 return sizeof(GLubyte);
193 case GL_UNSIGNED_SHORT_5_6_5:
194 return sizeof(GLushort);
195 case GL_UNSIGNED_SHORT_5_6_5_REV:
196 return sizeof(GLushort);
197 case GL_UNSIGNED_SHORT_4_4_4_4:
198 return sizeof(GLushort);
199 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
200 return sizeof(GLushort);
201 case GL_UNSIGNED_SHORT_5_5_5_1:
202 return sizeof(GLushort);
203 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
204 return sizeof(GLushort);
205 case GL_UNSIGNED_INT_8_8_8_8:
206 return sizeof(GLuint);
207 case GL_UNSIGNED_INT_8_8_8_8_REV:
208 return sizeof(GLuint);
209 case GL_UNSIGNED_INT_10_10_10_2:
210 return sizeof(GLuint);
211 case GL_UNSIGNED_INT_2_10_10_10_REV:
212 return sizeof(GLuint);
213 case GL_UNSIGNED_SHORT_8_8_MESA:
214 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
215 return sizeof(GLushort);
216 case GL_UNSIGNED_INT_24_8_EXT:
217 return sizeof(GLuint);
218 default:
219 return -1;
220 }
221 }
222
223
224 /**
225 * Get the number of components in a pixel format.
226 *
227 * \param format pixel format.
228 *
229 * \return the number of components in the given format, or -1 if a bad format.
230 */
231 GLint
232 _mesa_components_in_format( GLenum format )
233 {
234 switch (format) {
235 case GL_COLOR_INDEX:
236 case GL_COLOR_INDEX1_EXT:
237 case GL_COLOR_INDEX2_EXT:
238 case GL_COLOR_INDEX4_EXT:
239 case GL_COLOR_INDEX8_EXT:
240 case GL_COLOR_INDEX12_EXT:
241 case GL_COLOR_INDEX16_EXT:
242 case GL_STENCIL_INDEX:
243 case GL_DEPTH_COMPONENT:
244 case GL_RED:
245 case GL_RED_INTEGER_EXT:
246 case GL_GREEN:
247 case GL_GREEN_INTEGER_EXT:
248 case GL_BLUE:
249 case GL_BLUE_INTEGER_EXT:
250 case GL_ALPHA:
251 case GL_ALPHA_INTEGER_EXT:
252 case GL_LUMINANCE:
253 case GL_LUMINANCE_INTEGER_EXT:
254 case GL_INTENSITY:
255 return 1;
256 case GL_LUMINANCE_ALPHA:
257 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
258 case GL_RG:
259 return 2;
260 case GL_RGB:
261 case GL_RGB_INTEGER_EXT:
262 return 3;
263 case GL_RGBA:
264 case GL_RGBA_INTEGER_EXT:
265 return 4;
266 case GL_BGR:
267 return 3;
268 case GL_BGRA:
269 return 4;
270 case GL_ABGR_EXT:
271 return 4;
272 case GL_YCBCR_MESA:
273 return 2;
274 case GL_DEPTH_STENCIL_EXT:
275 return 2;
276 case GL_DUDV_ATI:
277 case GL_DU8DV8_ATI:
278 return 2;
279 default:
280 return -1;
281 }
282 }
283
284
285 /**
286 * Get the bytes per pixel of pixel format type pair.
287 *
288 * \param format pixel format.
289 * \param type pixel type.
290 *
291 * \return bytes per pixel, or -1 if a bad format or type was given.
292 */
293 GLint
294 _mesa_bytes_per_pixel( GLenum format, GLenum type )
295 {
296 GLint comps = _mesa_components_in_format( format );
297 if (comps < 0)
298 return -1;
299
300 switch (type) {
301 case GL_BITMAP:
302 return 0; /* special case */
303 case GL_BYTE:
304 case GL_UNSIGNED_BYTE:
305 return comps * sizeof(GLubyte);
306 case GL_SHORT:
307 case GL_UNSIGNED_SHORT:
308 return comps * sizeof(GLshort);
309 case GL_INT:
310 case GL_UNSIGNED_INT:
311 return comps * sizeof(GLint);
312 case GL_FLOAT:
313 return comps * sizeof(GLfloat);
314 case GL_HALF_FLOAT_ARB:
315 return comps * sizeof(GLhalfARB);
316 case GL_UNSIGNED_BYTE_3_3_2:
317 case GL_UNSIGNED_BYTE_2_3_3_REV:
318 if (format == GL_RGB || format == GL_BGR ||
319 format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
320 return sizeof(GLubyte);
321 else
322 return -1; /* error */
323 case GL_UNSIGNED_SHORT_5_6_5:
324 case GL_UNSIGNED_SHORT_5_6_5_REV:
325 if (format == GL_RGB || format == GL_BGR ||
326 format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
327 return sizeof(GLushort);
328 else
329 return -1; /* error */
330 case GL_UNSIGNED_SHORT_4_4_4_4:
331 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
332 case GL_UNSIGNED_SHORT_5_5_5_1:
333 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
334 if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
335 format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
336 return sizeof(GLushort);
337 else
338 return -1;
339 case GL_UNSIGNED_INT_8_8_8_8:
340 case GL_UNSIGNED_INT_8_8_8_8_REV:
341 case GL_UNSIGNED_INT_10_10_10_2:
342 case GL_UNSIGNED_INT_2_10_10_10_REV:
343 if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
344 format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
345 return sizeof(GLuint);
346 else
347 return -1;
348 case GL_UNSIGNED_SHORT_8_8_MESA:
349 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
350 if (format == GL_YCBCR_MESA)
351 return sizeof(GLushort);
352 else
353 return -1;
354 case GL_UNSIGNED_INT_24_8_EXT:
355 if (format == GL_DEPTH_STENCIL_EXT)
356 return sizeof(GLuint);
357 else
358 return -1;
359 default:
360 return -1;
361 }
362 }
363
364
365 /**
366 * Test for a legal pixel format and type.
367 *
368 * \param format pixel format.
369 * \param type pixel type.
370 *
371 * \return GL_TRUE if the given pixel format and type are legal, or GL_FALSE
372 * otherwise.
373 */
374 GLboolean
375 _mesa_is_legal_format_and_type(const struct gl_context *ctx,
376 GLenum format, GLenum type)
377 {
378 switch (format) {
379 case GL_COLOR_INDEX:
380 case GL_STENCIL_INDEX:
381 switch (type) {
382 case GL_BITMAP:
383 case GL_BYTE:
384 case GL_UNSIGNED_BYTE:
385 case GL_SHORT:
386 case GL_UNSIGNED_SHORT:
387 case GL_INT:
388 case GL_UNSIGNED_INT:
389 case GL_FLOAT:
390 return GL_TRUE;
391 case GL_HALF_FLOAT_ARB:
392 return ctx->Extensions.ARB_half_float_pixel;
393 default:
394 return GL_FALSE;
395 }
396 case GL_RED:
397 case GL_GREEN:
398 case GL_BLUE:
399 case GL_ALPHA:
400 #if 0 /* not legal! see table 3.6 of the 1.5 spec */
401 case GL_INTENSITY:
402 #endif
403 case GL_LUMINANCE:
404 case GL_LUMINANCE_ALPHA:
405 case GL_DEPTH_COMPONENT:
406 switch (type) {
407 case GL_BYTE:
408 case GL_UNSIGNED_BYTE:
409 case GL_SHORT:
410 case GL_UNSIGNED_SHORT:
411 case GL_INT:
412 case GL_UNSIGNED_INT:
413 case GL_FLOAT:
414 return GL_TRUE;
415 case GL_HALF_FLOAT_ARB:
416 return ctx->Extensions.ARB_half_float_pixel;
417 default:
418 return GL_FALSE;
419 }
420 case GL_RG:
421 if (!ctx->Extensions.ARB_texture_rg)
422 return GL_FALSE;
423
424 switch (type) {
425 case GL_BYTE:
426 case GL_UNSIGNED_BYTE:
427 case GL_SHORT:
428 case GL_UNSIGNED_SHORT:
429 case GL_INT:
430 case GL_UNSIGNED_INT:
431 case GL_FLOAT:
432 return GL_TRUE;
433 case GL_HALF_FLOAT_ARB:
434 return ctx->Extensions.ARB_half_float_pixel;
435 default:
436 return GL_FALSE;
437 }
438 case GL_RGB:
439 switch (type) {
440 case GL_BYTE:
441 case GL_UNSIGNED_BYTE:
442 case GL_SHORT:
443 case GL_UNSIGNED_SHORT:
444 case GL_INT:
445 case GL_UNSIGNED_INT:
446 case GL_FLOAT:
447 case GL_UNSIGNED_BYTE_3_3_2:
448 case GL_UNSIGNED_BYTE_2_3_3_REV:
449 case GL_UNSIGNED_SHORT_5_6_5:
450 case GL_UNSIGNED_SHORT_5_6_5_REV:
451 return GL_TRUE;
452 case GL_HALF_FLOAT_ARB:
453 return ctx->Extensions.ARB_half_float_pixel;
454 default:
455 return GL_FALSE;
456 }
457 case GL_BGR:
458 switch (type) {
459 /* NOTE: no packed types are supported with BGR. That's
460 * intentional, according to the GL spec.
461 */
462 case GL_BYTE:
463 case GL_UNSIGNED_BYTE:
464 case GL_SHORT:
465 case GL_UNSIGNED_SHORT:
466 case GL_INT:
467 case GL_UNSIGNED_INT:
468 case GL_FLOAT:
469 return GL_TRUE;
470 case GL_HALF_FLOAT_ARB:
471 return ctx->Extensions.ARB_half_float_pixel;
472 default:
473 return GL_FALSE;
474 }
475 case GL_RGBA:
476 case GL_BGRA:
477 case GL_ABGR_EXT:
478 switch (type) {
479 case GL_BYTE:
480 case GL_UNSIGNED_BYTE:
481 case GL_SHORT:
482 case GL_UNSIGNED_SHORT:
483 case GL_INT:
484 case GL_UNSIGNED_INT:
485 case GL_FLOAT:
486 case GL_UNSIGNED_SHORT_4_4_4_4:
487 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
488 case GL_UNSIGNED_SHORT_5_5_5_1:
489 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
490 case GL_UNSIGNED_INT_8_8_8_8:
491 case GL_UNSIGNED_INT_8_8_8_8_REV:
492 case GL_UNSIGNED_INT_10_10_10_2:
493 case GL_UNSIGNED_INT_2_10_10_10_REV:
494 return GL_TRUE;
495 case GL_HALF_FLOAT_ARB:
496 return ctx->Extensions.ARB_half_float_pixel;
497 default:
498 return GL_FALSE;
499 }
500 case GL_YCBCR_MESA:
501 if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
502 type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
503 return GL_TRUE;
504 else
505 return GL_FALSE;
506 case GL_DEPTH_STENCIL_EXT:
507 if (ctx->Extensions.EXT_packed_depth_stencil
508 && type == GL_UNSIGNED_INT_24_8_EXT)
509 return GL_TRUE;
510 else
511 return GL_FALSE;
512 case GL_DUDV_ATI:
513 case GL_DU8DV8_ATI:
514 switch (type) {
515 case GL_BYTE:
516 case GL_UNSIGNED_BYTE:
517 case GL_SHORT:
518 case GL_UNSIGNED_SHORT:
519 case GL_INT:
520 case GL_UNSIGNED_INT:
521 case GL_FLOAT:
522 return GL_TRUE;
523 default:
524 return GL_FALSE;
525 }
526
527 /* integer-valued formats */
528 case GL_RED_INTEGER_EXT:
529 case GL_GREEN_INTEGER_EXT:
530 case GL_BLUE_INTEGER_EXT:
531 case GL_ALPHA_INTEGER_EXT:
532 switch (type) {
533 case GL_BYTE:
534 case GL_UNSIGNED_BYTE:
535 case GL_SHORT:
536 case GL_UNSIGNED_SHORT:
537 case GL_INT:
538 case GL_UNSIGNED_INT:
539 return ctx->Extensions.EXT_texture_integer;
540 default:
541 return GL_FALSE;
542 }
543
544 case GL_RGB_INTEGER_EXT:
545 switch (type) {
546 case GL_BYTE:
547 case GL_UNSIGNED_BYTE:
548 case GL_SHORT:
549 case GL_UNSIGNED_SHORT:
550 case GL_INT:
551 case GL_UNSIGNED_INT:
552 case GL_UNSIGNED_BYTE_3_3_2:
553 case GL_UNSIGNED_BYTE_2_3_3_REV:
554 case GL_UNSIGNED_SHORT_5_6_5:
555 case GL_UNSIGNED_SHORT_5_6_5_REV:
556 return ctx->Extensions.EXT_texture_integer;
557 default:
558 return GL_FALSE;
559 }
560
561 case GL_BGR_INTEGER_EXT:
562 switch (type) {
563 case GL_BYTE:
564 case GL_UNSIGNED_BYTE:
565 case GL_SHORT:
566 case GL_UNSIGNED_SHORT:
567 case GL_INT:
568 case GL_UNSIGNED_INT:
569 /* NOTE: no packed formats w/ BGR format */
570 return ctx->Extensions.EXT_texture_integer;
571 default:
572 return GL_FALSE;
573 }
574
575 case GL_RGBA_INTEGER_EXT:
576 case GL_BGRA_INTEGER_EXT:
577 switch (type) {
578 case GL_BYTE:
579 case GL_UNSIGNED_BYTE:
580 case GL_SHORT:
581 case GL_UNSIGNED_SHORT:
582 case GL_INT:
583 case GL_UNSIGNED_INT:
584 case GL_UNSIGNED_SHORT_4_4_4_4:
585 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
586 case GL_UNSIGNED_SHORT_5_5_5_1:
587 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
588 case GL_UNSIGNED_INT_8_8_8_8:
589 case GL_UNSIGNED_INT_8_8_8_8_REV:
590 case GL_UNSIGNED_INT_10_10_10_2:
591 case GL_UNSIGNED_INT_2_10_10_10_REV:
592 return ctx->Extensions.EXT_texture_integer;
593 default:
594 return GL_FALSE;
595 }
596
597 case GL_LUMINANCE_INTEGER_EXT:
598 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
599 switch (type) {
600 case GL_BYTE:
601 case GL_UNSIGNED_BYTE:
602 case GL_SHORT:
603 case GL_UNSIGNED_SHORT:
604 case GL_INT:
605 case GL_UNSIGNED_INT:
606 return ctx->Extensions.EXT_texture_integer;
607 default:
608 return GL_FALSE;
609 }
610
611 default:
612 ; /* fall-through */
613 }
614 return GL_FALSE;
615 }
616
617
618 /**
619 * Test if the given image format is a color/RGBA format (i.e., not color
620 * index, depth, stencil, etc).
621 * \param format the image format value (may by an internal texture format)
622 * \return GL_TRUE if its a color/RGBA format, GL_FALSE otherwise.
623 */
624 GLboolean
625 _mesa_is_color_format(GLenum format)
626 {
627 switch (format) {
628 case GL_RED:
629 case GL_GREEN:
630 case GL_BLUE:
631 case GL_ALPHA:
632 case GL_ALPHA4:
633 case GL_ALPHA8:
634 case GL_ALPHA12:
635 case GL_ALPHA16:
636 case 1:
637 case GL_LUMINANCE:
638 case GL_LUMINANCE4:
639 case GL_LUMINANCE8:
640 case GL_LUMINANCE12:
641 case GL_LUMINANCE16:
642 case 2:
643 case GL_LUMINANCE_ALPHA:
644 case GL_LUMINANCE4_ALPHA4:
645 case GL_LUMINANCE6_ALPHA2:
646 case GL_LUMINANCE8_ALPHA8:
647 case GL_LUMINANCE12_ALPHA4:
648 case GL_LUMINANCE12_ALPHA12:
649 case GL_LUMINANCE16_ALPHA16:
650 case GL_INTENSITY:
651 case GL_INTENSITY4:
652 case GL_INTENSITY8:
653 case GL_INTENSITY12:
654 case GL_INTENSITY16:
655 case GL_R8:
656 case GL_R16:
657 case GL_RG:
658 case GL_RG8:
659 case GL_RG16:
660 case 3:
661 case GL_RGB:
662 case GL_BGR:
663 case GL_R3_G3_B2:
664 case GL_RGB4:
665 case GL_RGB5:
666 case GL_RGB8:
667 case GL_RGB10:
668 case GL_RGB12:
669 case GL_RGB16:
670 case 4:
671 case GL_ABGR_EXT:
672 case GL_RGBA:
673 case GL_BGRA:
674 case GL_RGBA2:
675 case GL_RGBA4:
676 case GL_RGB5_A1:
677 case GL_RGBA8:
678 case GL_RGB10_A2:
679 case GL_RGBA12:
680 case GL_RGBA16:
681 /* float texture formats */
682 case GL_ALPHA16F_ARB:
683 case GL_ALPHA32F_ARB:
684 case GL_LUMINANCE16F_ARB:
685 case GL_LUMINANCE32F_ARB:
686 case GL_LUMINANCE_ALPHA16F_ARB:
687 case GL_LUMINANCE_ALPHA32F_ARB:
688 case GL_INTENSITY16F_ARB:
689 case GL_INTENSITY32F_ARB:
690 case GL_R16F:
691 case GL_R32F:
692 case GL_RG16F:
693 case GL_RG32F:
694 case GL_RGB16F_ARB:
695 case GL_RGB32F_ARB:
696 case GL_RGBA16F_ARB:
697 case GL_RGBA32F_ARB:
698 /* compressed formats */
699 case GL_COMPRESSED_ALPHA:
700 case GL_COMPRESSED_LUMINANCE:
701 case GL_COMPRESSED_LUMINANCE_ALPHA:
702 case GL_COMPRESSED_INTENSITY:
703 case GL_COMPRESSED_RED:
704 case GL_COMPRESSED_RG:
705 case GL_COMPRESSED_RGB:
706 case GL_COMPRESSED_RGBA:
707 case GL_RGB_S3TC:
708 case GL_RGB4_S3TC:
709 case GL_RGBA_S3TC:
710 case GL_RGBA4_S3TC:
711 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
712 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
713 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
714 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
715 case GL_COMPRESSED_RGB_FXT1_3DFX:
716 case GL_COMPRESSED_RGBA_FXT1_3DFX:
717 #if FEATURE_EXT_texture_sRGB
718 case GL_SRGB_EXT:
719 case GL_SRGB8_EXT:
720 case GL_SRGB_ALPHA_EXT:
721 case GL_SRGB8_ALPHA8_EXT:
722 case GL_SLUMINANCE_ALPHA_EXT:
723 case GL_SLUMINANCE8_ALPHA8_EXT:
724 case GL_SLUMINANCE_EXT:
725 case GL_SLUMINANCE8_EXT:
726 case GL_COMPRESSED_SRGB_EXT:
727 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
728 case GL_COMPRESSED_SRGB_ALPHA_EXT:
729 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
730 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
731 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
732 case GL_COMPRESSED_SLUMINANCE_EXT:
733 case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
734 #endif /* FEATURE_EXT_texture_sRGB */
735 case GL_COMPRESSED_RED_RGTC1:
736 case GL_COMPRESSED_SIGNED_RED_RGTC1:
737 case GL_COMPRESSED_RG_RGTC2:
738 case GL_COMPRESSED_SIGNED_RG_RGTC2:
739 /* signed, normalized texture formats */
740 case GL_RGBA_SNORM:
741 case GL_RGBA8_SNORM:
742 /* generic integer formats */
743 case GL_RED_INTEGER_EXT:
744 case GL_GREEN_INTEGER_EXT:
745 case GL_BLUE_INTEGER_EXT:
746 case GL_ALPHA_INTEGER_EXT:
747 case GL_RGB_INTEGER_EXT:
748 case GL_RGBA_INTEGER_EXT:
749 case GL_BGR_INTEGER_EXT:
750 case GL_BGRA_INTEGER_EXT:
751 case GL_LUMINANCE_INTEGER_EXT:
752 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
753 /* sized integer formats */
754 case GL_RGBA32UI_EXT:
755 case GL_RGB32UI_EXT:
756 case GL_ALPHA32UI_EXT:
757 case GL_INTENSITY32UI_EXT:
758 case GL_LUMINANCE32UI_EXT:
759 case GL_LUMINANCE_ALPHA32UI_EXT:
760 case GL_RGBA16UI_EXT:
761 case GL_RGB16UI_EXT:
762 case GL_ALPHA16UI_EXT:
763 case GL_INTENSITY16UI_EXT:
764 case GL_LUMINANCE16UI_EXT:
765 case GL_LUMINANCE_ALPHA16UI_EXT:
766 case GL_RGBA8UI_EXT:
767 case GL_RGB8UI_EXT:
768 case GL_ALPHA8UI_EXT:
769 case GL_INTENSITY8UI_EXT:
770 case GL_LUMINANCE8UI_EXT:
771 case GL_LUMINANCE_ALPHA8UI_EXT:
772 case GL_RGBA32I_EXT:
773 case GL_RGB32I_EXT:
774 case GL_ALPHA32I_EXT:
775 case GL_INTENSITY32I_EXT:
776 case GL_LUMINANCE32I_EXT:
777 case GL_LUMINANCE_ALPHA32I_EXT:
778 case GL_RGBA16I_EXT:
779 case GL_RGB16I_EXT:
780 case GL_ALPHA16I_EXT:
781 case GL_INTENSITY16I_EXT:
782 case GL_LUMINANCE16I_EXT:
783 case GL_LUMINANCE_ALPHA16I_EXT:
784 case GL_RGBA8I_EXT:
785 case GL_RGB8I_EXT:
786 case GL_ALPHA8I_EXT:
787 case GL_INTENSITY8I_EXT:
788 case GL_LUMINANCE8I_EXT:
789 case GL_LUMINANCE_ALPHA8I_EXT:
790 return GL_TRUE;
791 case GL_YCBCR_MESA: /* not considered to be RGB */
792 /* fall-through */
793 default:
794 return GL_FALSE;
795 }
796 }
797
798
799 /**
800 * Test if the given image format is a color index format.
801 */
802 GLboolean
803 _mesa_is_index_format(GLenum format)
804 {
805 switch (format) {
806 case GL_COLOR_INDEX:
807 case GL_COLOR_INDEX1_EXT:
808 case GL_COLOR_INDEX2_EXT:
809 case GL_COLOR_INDEX4_EXT:
810 case GL_COLOR_INDEX8_EXT:
811 case GL_COLOR_INDEX12_EXT:
812 case GL_COLOR_INDEX16_EXT:
813 return GL_TRUE;
814 default:
815 return GL_FALSE;
816 }
817 }
818
819
820 /**
821 * Test if the given image format is a depth component format.
822 */
823 GLboolean
824 _mesa_is_depth_format(GLenum format)
825 {
826 switch (format) {
827 case GL_DEPTH_COMPONENT:
828 case GL_DEPTH_COMPONENT16:
829 case GL_DEPTH_COMPONENT24:
830 case GL_DEPTH_COMPONENT32:
831 return GL_TRUE;
832 default:
833 return GL_FALSE;
834 }
835 }
836
837
838 /**
839 * Test if the given image format is a stencil format.
840 */
841 GLboolean
842 _mesa_is_stencil_format(GLenum format)
843 {
844 switch (format) {
845 case GL_STENCIL_INDEX:
846 case GL_DEPTH_STENCIL:
847 return GL_TRUE;
848 default:
849 return GL_FALSE;
850 }
851 }
852
853
854 /**
855 * Test if the given image format is a YCbCr format.
856 */
857 GLboolean
858 _mesa_is_ycbcr_format(GLenum format)
859 {
860 switch (format) {
861 case GL_YCBCR_MESA:
862 return GL_TRUE;
863 default:
864 return GL_FALSE;
865 }
866 }
867
868
869 /**
870 * Test if the given image format is a depth+stencil format.
871 */
872 GLboolean
873 _mesa_is_depthstencil_format(GLenum format)
874 {
875 switch (format) {
876 case GL_DEPTH24_STENCIL8_EXT:
877 case GL_DEPTH_STENCIL_EXT:
878 return GL_TRUE;
879 default:
880 return GL_FALSE;
881 }
882 }
883
884
885 /**
886 * Test if the given image format is a depth or stencil format.
887 */
888 GLboolean
889 _mesa_is_depth_or_stencil_format(GLenum format)
890 {
891 switch (format) {
892 case GL_DEPTH_COMPONENT:
893 case GL_DEPTH_COMPONENT16:
894 case GL_DEPTH_COMPONENT24:
895 case GL_DEPTH_COMPONENT32:
896 case GL_STENCIL_INDEX:
897 case GL_STENCIL_INDEX1_EXT:
898 case GL_STENCIL_INDEX4_EXT:
899 case GL_STENCIL_INDEX8_EXT:
900 case GL_STENCIL_INDEX16_EXT:
901 case GL_DEPTH_STENCIL_EXT:
902 case GL_DEPTH24_STENCIL8_EXT:
903 return GL_TRUE;
904 default:
905 return GL_FALSE;
906 }
907 }
908
909
910 /**
911 * Test if the given image format is a dudv format.
912 */
913 GLboolean
914 _mesa_is_dudv_format(GLenum format)
915 {
916 switch (format) {
917 case GL_DUDV_ATI:
918 case GL_DU8DV8_ATI:
919 return GL_TRUE;
920 default:
921 return GL_FALSE;
922 }
923 }
924
925
926 /**
927 * Test if the given format is an integer (non-normalized) format.
928 */
929 GLboolean
930 _mesa_is_integer_format(GLenum format)
931 {
932 switch (format) {
933 /* generic integer formats */
934 case GL_RED_INTEGER_EXT:
935 case GL_GREEN_INTEGER_EXT:
936 case GL_BLUE_INTEGER_EXT:
937 case GL_ALPHA_INTEGER_EXT:
938 case GL_RGB_INTEGER_EXT:
939 case GL_RGBA_INTEGER_EXT:
940 case GL_BGR_INTEGER_EXT:
941 case GL_BGRA_INTEGER_EXT:
942 case GL_LUMINANCE_INTEGER_EXT:
943 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
944 /* specific integer formats */
945 case GL_RGBA32UI_EXT:
946 case GL_RGB32UI_EXT:
947 case GL_ALPHA32UI_EXT:
948 case GL_INTENSITY32UI_EXT:
949 case GL_LUMINANCE32UI_EXT:
950 case GL_LUMINANCE_ALPHA32UI_EXT:
951 case GL_RGBA16UI_EXT:
952 case GL_RGB16UI_EXT:
953 case GL_ALPHA16UI_EXT:
954 case GL_INTENSITY16UI_EXT:
955 case GL_LUMINANCE16UI_EXT:
956 case GL_LUMINANCE_ALPHA16UI_EXT:
957 case GL_RGBA8UI_EXT:
958 case GL_RGB8UI_EXT:
959 case GL_ALPHA8UI_EXT:
960 case GL_INTENSITY8UI_EXT:
961 case GL_LUMINANCE8UI_EXT:
962 case GL_LUMINANCE_ALPHA8UI_EXT:
963 case GL_RGBA32I_EXT:
964 case GL_RGB32I_EXT:
965 case GL_ALPHA32I_EXT:
966 case GL_INTENSITY32I_EXT:
967 case GL_LUMINANCE32I_EXT:
968 case GL_LUMINANCE_ALPHA32I_EXT:
969 case GL_RGBA16I_EXT:
970 case GL_RGB16I_EXT:
971 case GL_ALPHA16I_EXT:
972 case GL_INTENSITY16I_EXT:
973 case GL_LUMINANCE16I_EXT:
974 case GL_LUMINANCE_ALPHA16I_EXT:
975 case GL_RGBA8I_EXT:
976 case GL_RGB8I_EXT:
977 case GL_ALPHA8I_EXT:
978 case GL_INTENSITY8I_EXT:
979 case GL_LUMINANCE8I_EXT:
980 case GL_LUMINANCE_ALPHA8I_EXT:
981 return GL_TRUE;
982 default:
983 return GL_FALSE;
984 }
985 }
986
987
988 /**
989 * Test if an image format is a supported compressed format.
990 * \param format the internal format token provided by the user.
991 * \return GL_TRUE if compressed, GL_FALSE if uncompressed
992 */
993 GLboolean
994 _mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
995 {
996 switch (format) {
997 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
998 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
999 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
1000 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
1001 return ctx->Extensions.EXT_texture_compression_s3tc;
1002 case GL_RGB_S3TC:
1003 case GL_RGB4_S3TC:
1004 case GL_RGBA_S3TC:
1005 case GL_RGBA4_S3TC:
1006 return ctx->Extensions.S3_s3tc;
1007 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
1008 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
1009 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
1010 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
1011 return ctx->Extensions.EXT_texture_sRGB
1012 && ctx->Extensions.EXT_texture_compression_s3tc;
1013 case GL_COMPRESSED_RGB_FXT1_3DFX:
1014 case GL_COMPRESSED_RGBA_FXT1_3DFX:
1015 return ctx->Extensions.TDFX_texture_compression_FXT1;
1016 case GL_COMPRESSED_RED_RGTC1:
1017 case GL_COMPRESSED_SIGNED_RED_RGTC1:
1018 case GL_COMPRESSED_RG_RGTC2:
1019 case GL_COMPRESSED_SIGNED_RG_RGTC2:
1020 return ctx->Extensions.ARB_texture_compression_rgtc;
1021 default:
1022 return GL_FALSE;
1023 }
1024 }
1025
1026
1027 /**
1028 * Return the address of a specific pixel in an image (1D, 2D or 3D).
1029 *
1030 * Pixel unpacking/packing parameters are observed according to \p packing.
1031 *
1032 * \param dimensions either 1, 2 or 3 to indicate dimensionality of image
1033 * \param image starting address of image data
1034 * \param width the image width
1035 * \param height theimage height
1036 * \param format the pixel format
1037 * \param type the pixel data type
1038 * \param packing the pixelstore attributes
1039 * \param img which image in the volume (0 for 1D or 2D images)
1040 * \param row row of pixel in the image (0 for 1D images)
1041 * \param column column of pixel in the image
1042 *
1043 * \return address of pixel on success, or NULL on error.
1044 *
1045 * \sa gl_pixelstore_attrib.
1046 */
1047 GLvoid *
1048 _mesa_image_address( GLuint dimensions,
1049 const struct gl_pixelstore_attrib *packing,
1050 const GLvoid *image,
1051 GLsizei width, GLsizei height,
1052 GLenum format, GLenum type,
1053 GLint img, GLint row, GLint column )
1054 {
1055 GLint alignment; /* 1, 2 or 4 */
1056 GLint pixels_per_row;
1057 GLint rows_per_image;
1058 GLint skiprows;
1059 GLint skippixels;
1060 GLint skipimages; /* for 3-D volume images */
1061 GLubyte *pixel_addr;
1062
1063 ASSERT(dimensions >= 1 && dimensions <= 3);
1064
1065 alignment = packing->Alignment;
1066 if (packing->RowLength > 0) {
1067 pixels_per_row = packing->RowLength;
1068 }
1069 else {
1070 pixels_per_row = width;
1071 }
1072 if (packing->ImageHeight > 0) {
1073 rows_per_image = packing->ImageHeight;
1074 }
1075 else {
1076 rows_per_image = height;
1077 }
1078
1079 skippixels = packing->SkipPixels;
1080 /* Note: SKIP_ROWS _is_ used for 1D images */
1081 skiprows = packing->SkipRows;
1082 /* Note: SKIP_IMAGES is only used for 3D images */
1083 skipimages = (dimensions == 3) ? packing->SkipImages : 0;
1084
1085 if (type == GL_BITMAP) {
1086 /* BITMAP data */
1087 GLint comp_per_pixel; /* components per pixel */
1088 GLint bytes_per_comp; /* bytes per component */
1089 GLint bytes_per_row;
1090 GLint bytes_per_image;
1091
1092 /* Compute bytes per component */
1093 bytes_per_comp = _mesa_sizeof_packed_type( type );
1094 if (bytes_per_comp < 0) {
1095 return NULL;
1096 }
1097
1098 /* Compute number of components per pixel */
1099 comp_per_pixel = _mesa_components_in_format( format );
1100 if (comp_per_pixel < 0) {
1101 return NULL;
1102 }
1103
1104 bytes_per_row = alignment
1105 * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
1106
1107 bytes_per_image = bytes_per_row * rows_per_image;
1108
1109 pixel_addr = (GLubyte *) image
1110 + (skipimages + img) * bytes_per_image
1111 + (skiprows + row) * bytes_per_row
1112 + (skippixels + column) / 8;
1113 }
1114 else {
1115 /* Non-BITMAP data */
1116 GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
1117 GLint topOfImage;
1118
1119 bytes_per_pixel = _mesa_bytes_per_pixel( format, type );
1120
1121 /* The pixel type and format should have been error checked earlier */
1122 assert(bytes_per_pixel > 0);
1123
1124 bytes_per_row = pixels_per_row * bytes_per_pixel;
1125 remainder = bytes_per_row % alignment;
1126 if (remainder > 0)
1127 bytes_per_row += (alignment - remainder);
1128
1129 ASSERT(bytes_per_row % alignment == 0);
1130
1131 bytes_per_image = bytes_per_row * rows_per_image;
1132
1133 if (packing->Invert) {
1134 /* set pixel_addr to the last row */
1135 topOfImage = bytes_per_row * (height - 1);
1136 bytes_per_row = -bytes_per_row;
1137 }
1138 else {
1139 topOfImage = 0;
1140 }
1141
1142 /* compute final pixel address */
1143 pixel_addr = (GLubyte *) image
1144 + (skipimages + img) * bytes_per_image
1145 + topOfImage
1146 + (skiprows + row) * bytes_per_row
1147 + (skippixels + column) * bytes_per_pixel;
1148 }
1149
1150 return (GLvoid *) pixel_addr;
1151 }
1152
1153
1154 GLvoid *
1155 _mesa_image_address1d( const struct gl_pixelstore_attrib *packing,
1156 const GLvoid *image,
1157 GLsizei width,
1158 GLenum format, GLenum type,
1159 GLint column )
1160 {
1161 return _mesa_image_address(1, packing, image, width, 1,
1162 format, type, 0, 0, column);
1163 }
1164
1165
1166 GLvoid *
1167 _mesa_image_address2d( const struct gl_pixelstore_attrib *packing,
1168 const GLvoid *image,
1169 GLsizei width, GLsizei height,
1170 GLenum format, GLenum type,
1171 GLint row, GLint column )
1172 {
1173 return _mesa_image_address(2, packing, image, width, height,
1174 format, type, 0, row, column);
1175 }
1176
1177
1178 GLvoid *
1179 _mesa_image_address3d( const struct gl_pixelstore_attrib *packing,
1180 const GLvoid *image,
1181 GLsizei width, GLsizei height,
1182 GLenum format, GLenum type,
1183 GLint img, GLint row, GLint column )
1184 {
1185 return _mesa_image_address(3, packing, image, width, height,
1186 format, type, img, row, column);
1187 }
1188
1189
1190
1191 /**
1192 * Compute the stride (in bytes) between image rows.
1193 *
1194 * \param packing the pixelstore attributes
1195 * \param width image width.
1196 * \param format pixel format.
1197 * \param type pixel data type.
1198 *
1199 * \return the stride in bytes for the given parameters, or -1 if error
1200 */
1201 GLint
1202 _mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
1203 GLint width, GLenum format, GLenum type )
1204 {
1205 GLint bytesPerRow, remainder;
1206
1207 ASSERT(packing);
1208
1209 if (type == GL_BITMAP) {
1210 if (packing->RowLength == 0) {
1211 bytesPerRow = (width + 7) / 8;
1212 }
1213 else {
1214 bytesPerRow = (packing->RowLength + 7) / 8;
1215 }
1216 }
1217 else {
1218 /* Non-BITMAP data */
1219 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1220 if (bytesPerPixel <= 0)
1221 return -1; /* error */
1222 if (packing->RowLength == 0) {
1223 bytesPerRow = bytesPerPixel * width;
1224 }
1225 else {
1226 bytesPerRow = bytesPerPixel * packing->RowLength;
1227 }
1228 }
1229
1230 remainder = bytesPerRow % packing->Alignment;
1231 if (remainder > 0) {
1232 bytesPerRow += (packing->Alignment - remainder);
1233 }
1234
1235 if (packing->Invert) {
1236 /* negate the bytes per row (negative row stride) */
1237 bytesPerRow = -bytesPerRow;
1238 }
1239
1240 return bytesPerRow;
1241 }
1242
1243
1244 /*
1245 * Compute the stride between images in a 3D texture (in bytes) for the given
1246 * pixel packing parameters and image width, format and type.
1247 */
1248 GLint
1249 _mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
1250 GLint width, GLint height,
1251 GLenum format, GLenum type )
1252 {
1253 GLint bytesPerRow, bytesPerImage, remainder;
1254
1255 ASSERT(packing);
1256
1257 if (type == GL_BITMAP) {
1258 if (packing->RowLength == 0) {
1259 bytesPerRow = (width + 7) / 8;
1260 }
1261 else {
1262 bytesPerRow = (packing->RowLength + 7) / 8;
1263 }
1264 }
1265 else {
1266 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1267
1268 if (bytesPerPixel <= 0)
1269 return -1; /* error */
1270 if (packing->RowLength == 0) {
1271 bytesPerRow = bytesPerPixel * width;
1272 }
1273 else {
1274 bytesPerRow = bytesPerPixel * packing->RowLength;
1275 }
1276 }
1277
1278 remainder = bytesPerRow % packing->Alignment;
1279 if (remainder > 0)
1280 bytesPerRow += (packing->Alignment - remainder);
1281
1282 if (packing->ImageHeight == 0)
1283 bytesPerImage = bytesPerRow * height;
1284 else
1285 bytesPerImage = bytesPerRow * packing->ImageHeight;
1286
1287 return bytesPerImage;
1288 }
1289
1290
1291
1292 /**
1293 * "Expand" a bitmap from 1-bit per pixel to 8-bits per pixel.
1294 * This is typically used to convert a bitmap into a GLubyte/pixel texture.
1295 * "On" bits will set texels to \p onValue.
1296 * "Off" bits will not modify texels.
1297 * \param width src bitmap width in pixels
1298 * \param height src bitmap height in pixels
1299 * \param unpack bitmap unpacking state
1300 * \param bitmap the src bitmap data
1301 * \param destBuffer start of dest buffer
1302 * \param destStride row stride in dest buffer
1303 * \param onValue if bit is 1, set destBuffer pixel to this value
1304 */
1305 void
1306 _mesa_expand_bitmap(GLsizei width, GLsizei height,
1307 const struct gl_pixelstore_attrib *unpack,
1308 const GLubyte *bitmap,
1309 GLubyte *destBuffer, GLint destStride,
1310 GLubyte onValue)
1311 {
1312 const GLubyte *srcRow = (const GLubyte *)
1313 _mesa_image_address2d(unpack, bitmap, width, height,
1314 GL_COLOR_INDEX, GL_BITMAP, 0, 0);
1315 const GLint srcStride = _mesa_image_row_stride(unpack, width,
1316 GL_COLOR_INDEX, GL_BITMAP);
1317 GLint row, col;
1318
1319 #define SET_PIXEL(COL, ROW) \
1320 destBuffer[(ROW) * destStride + (COL)] = onValue;
1321
1322 for (row = 0; row < height; row++) {
1323 const GLubyte *src = srcRow;
1324
1325 if (unpack->LsbFirst) {
1326 /* Lsb first */
1327 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
1328 for (col = 0; col < width; col++) {
1329
1330 if (*src & mask) {
1331 SET_PIXEL(col, row);
1332 }
1333
1334 if (mask == 128U) {
1335 src++;
1336 mask = 1U;
1337 }
1338 else {
1339 mask = mask << 1;
1340 }
1341 }
1342
1343 /* get ready for next row */
1344 if (mask != 1)
1345 src++;
1346 }
1347 else {
1348 /* Msb first */
1349 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
1350 for (col = 0; col < width; col++) {
1351
1352 if (*src & mask) {
1353 SET_PIXEL(col, row);
1354 }
1355
1356 if (mask == 1U) {
1357 src++;
1358 mask = 128U;
1359 }
1360 else {
1361 mask = mask >> 1;
1362 }
1363 }
1364
1365 /* get ready for next row */
1366 if (mask != 128)
1367 src++;
1368 }
1369
1370 srcRow += srcStride;
1371 } /* row */
1372
1373 #undef SET_PIXEL
1374 }
1375
1376
1377
1378
1379 /**
1380 * Convert an array of RGBA colors from one datatype to another.
1381 * NOTE: src may equal dst. In that case, we use a temporary buffer.
1382 */
1383 void
1384 _mesa_convert_colors(GLenum srcType, const GLvoid *src,
1385 GLenum dstType, GLvoid *dst,
1386 GLuint count, const GLubyte mask[])
1387 {
1388 GLuint tempBuffer[MAX_WIDTH][4];
1389 const GLboolean useTemp = (src == dst);
1390
1391 ASSERT(srcType != dstType);
1392
1393 switch (srcType) {
1394 case GL_UNSIGNED_BYTE:
1395 if (dstType == GL_UNSIGNED_SHORT) {
1396 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1397 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1398 GLuint i;
1399 for (i = 0; i < count; i++) {
1400 if (!mask || mask[i]) {
1401 dst2[i][RCOMP] = UBYTE_TO_USHORT(src1[i][RCOMP]);
1402 dst2[i][GCOMP] = UBYTE_TO_USHORT(src1[i][GCOMP]);
1403 dst2[i][BCOMP] = UBYTE_TO_USHORT(src1[i][BCOMP]);
1404 dst2[i][ACOMP] = UBYTE_TO_USHORT(src1[i][ACOMP]);
1405 }
1406 }
1407 if (useTemp)
1408 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1409 }
1410 else {
1411 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1412 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1413 GLuint i;
1414 ASSERT(dstType == GL_FLOAT);
1415 for (i = 0; i < count; i++) {
1416 if (!mask || mask[i]) {
1417 dst4[i][RCOMP] = UBYTE_TO_FLOAT(src1[i][RCOMP]);
1418 dst4[i][GCOMP] = UBYTE_TO_FLOAT(src1[i][GCOMP]);
1419 dst4[i][BCOMP] = UBYTE_TO_FLOAT(src1[i][BCOMP]);
1420 dst4[i][ACOMP] = UBYTE_TO_FLOAT(src1[i][ACOMP]);
1421 }
1422 }
1423 if (useTemp)
1424 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1425 }
1426 break;
1427 case GL_UNSIGNED_SHORT:
1428 if (dstType == GL_UNSIGNED_BYTE) {
1429 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1430 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1431 GLuint i;
1432 for (i = 0; i < count; i++) {
1433 if (!mask || mask[i]) {
1434 dst1[i][RCOMP] = USHORT_TO_UBYTE(src2[i][RCOMP]);
1435 dst1[i][GCOMP] = USHORT_TO_UBYTE(src2[i][GCOMP]);
1436 dst1[i][BCOMP] = USHORT_TO_UBYTE(src2[i][BCOMP]);
1437 dst1[i][ACOMP] = USHORT_TO_UBYTE(src2[i][ACOMP]);
1438 }
1439 }
1440 if (useTemp)
1441 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1442 }
1443 else {
1444 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1445 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1446 GLuint i;
1447 ASSERT(dstType == GL_FLOAT);
1448 for (i = 0; i < count; i++) {
1449 if (!mask || mask[i]) {
1450 dst4[i][RCOMP] = USHORT_TO_FLOAT(src2[i][RCOMP]);
1451 dst4[i][GCOMP] = USHORT_TO_FLOAT(src2[i][GCOMP]);
1452 dst4[i][BCOMP] = USHORT_TO_FLOAT(src2[i][BCOMP]);
1453 dst4[i][ACOMP] = USHORT_TO_FLOAT(src2[i][ACOMP]);
1454 }
1455 }
1456 if (useTemp)
1457 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1458 }
1459 break;
1460 case GL_FLOAT:
1461 if (dstType == GL_UNSIGNED_BYTE) {
1462 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1463 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1464 GLuint i;
1465 for (i = 0; i < count; i++) {
1466 if (!mask || mask[i]) {
1467 UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][RCOMP], src4[i][RCOMP]);
1468 UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][GCOMP], src4[i][GCOMP]);
1469 UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][BCOMP], src4[i][BCOMP]);
1470 UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][ACOMP], src4[i][ACOMP]);
1471 }
1472 }
1473 if (useTemp)
1474 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1475 }
1476 else {
1477 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1478 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1479 GLuint i;
1480 ASSERT(dstType == GL_UNSIGNED_SHORT);
1481 for (i = 0; i < count; i++) {
1482 if (!mask || mask[i]) {
1483 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][RCOMP], src4[i][RCOMP]);
1484 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][GCOMP], src4[i][GCOMP]);
1485 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][BCOMP], src4[i][BCOMP]);
1486 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][ACOMP], src4[i][ACOMP]);
1487 }
1488 }
1489 if (useTemp)
1490 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1491 }
1492 break;
1493 default:
1494 _mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");
1495 }
1496 }
1497
1498
1499
1500
1501 /**
1502 * Perform basic clipping for glDrawPixels. The image's position and size
1503 * and the unpack SkipPixels and SkipRows are adjusted so that the image
1504 * region is entirely within the window and scissor bounds.
1505 * NOTE: this will only work when glPixelZoom is (1, 1) or (1, -1).
1506 * If Pixel.ZoomY is -1, *destY will be changed to be the first row which
1507 * we'll actually write. Beforehand, *destY-1 is the first drawing row.
1508 *
1509 * \return GL_TRUE if image is ready for drawing or
1510 * GL_FALSE if image was completely clipped away (draw nothing)
1511 */
1512 GLboolean
1513 _mesa_clip_drawpixels(const struct gl_context *ctx,
1514 GLint *destX, GLint *destY,
1515 GLsizei *width, GLsizei *height,
1516 struct gl_pixelstore_attrib *unpack)
1517 {
1518 const struct gl_framebuffer *buffer = ctx->DrawBuffer;
1519
1520 if (unpack->RowLength == 0) {
1521 unpack->RowLength = *width;
1522 }
1523
1524 ASSERT(ctx->Pixel.ZoomX == 1.0F);
1525 ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);
1526
1527 /* left clipping */
1528 if (*destX < buffer->_Xmin) {
1529 unpack->SkipPixels += (buffer->_Xmin - *destX);
1530 *width -= (buffer->_Xmin - *destX);
1531 *destX = buffer->_Xmin;
1532 }
1533 /* right clipping */
1534 if (*destX + *width > buffer->_Xmax)
1535 *width -= (*destX + *width - buffer->_Xmax);
1536
1537 if (*width <= 0)
1538 return GL_FALSE;
1539
1540 if (ctx->Pixel.ZoomY == 1.0F) {
1541 /* bottom clipping */
1542 if (*destY < buffer->_Ymin) {
1543 unpack->SkipRows += (buffer->_Ymin - *destY);
1544 *height -= (buffer->_Ymin - *destY);
1545 *destY = buffer->_Ymin;
1546 }
1547 /* top clipping */
1548 if (*destY + *height > buffer->_Ymax)
1549 *height -= (*destY + *height - buffer->_Ymax);
1550 }
1551 else { /* upside down */
1552 /* top clipping */
1553 if (*destY > buffer->_Ymax) {
1554 unpack->SkipRows += (*destY - buffer->_Ymax);
1555 *height -= (*destY - buffer->_Ymax);
1556 *destY = buffer->_Ymax;
1557 }
1558 /* bottom clipping */
1559 if (*destY - *height < buffer->_Ymin)
1560 *height -= (buffer->_Ymin - (*destY - *height));
1561 /* adjust destY so it's the first row to write to */
1562 (*destY)--;
1563 }
1564
1565 if (*height <= 0)
1566 return GL_FALSE;
1567
1568 return GL_TRUE;
1569 }
1570
1571
1572 /**
1573 * Perform clipping for glReadPixels. The image's window position
1574 * and size, and the pack skipPixels, skipRows and rowLength are adjusted
1575 * so that the image region is entirely within the window bounds.
1576 * Note: this is different from _mesa_clip_drawpixels() in that the
1577 * scissor box is ignored, and we use the bounds of the current readbuffer
1578 * surface.
1579 *
1580 * \return GL_TRUE if image is ready for drawing or
1581 * GL_FALSE if image was completely clipped away (draw nothing)
1582 */
1583 GLboolean
1584 _mesa_clip_readpixels(const struct gl_context *ctx,
1585 GLint *srcX, GLint *srcY,
1586 GLsizei *width, GLsizei *height,
1587 struct gl_pixelstore_attrib *pack)
1588 {
1589 const struct gl_framebuffer *buffer = ctx->ReadBuffer;
1590
1591 if (pack->RowLength == 0) {
1592 pack->RowLength = *width;
1593 }
1594
1595 /* left clipping */
1596 if (*srcX < 0) {
1597 pack->SkipPixels += (0 - *srcX);
1598 *width -= (0 - *srcX);
1599 *srcX = 0;
1600 }
1601 /* right clipping */
1602 if (*srcX + *width > (GLsizei) buffer->Width)
1603 *width -= (*srcX + *width - buffer->Width);
1604
1605 if (*width <= 0)
1606 return GL_FALSE;
1607
1608 /* bottom clipping */
1609 if (*srcY < 0) {
1610 pack->SkipRows += (0 - *srcY);
1611 *height -= (0 - *srcY);
1612 *srcY = 0;
1613 }
1614 /* top clipping */
1615 if (*srcY + *height > (GLsizei) buffer->Height)
1616 *height -= (*srcY + *height - buffer->Height);
1617
1618 if (*height <= 0)
1619 return GL_FALSE;
1620
1621 return GL_TRUE;
1622 }
1623
1624
1625 /**
1626 * Do clipping for a glCopyTexSubImage call.
1627 * The framebuffer source region might extend outside the framebuffer
1628 * bounds. Clip the source region against the framebuffer bounds and
1629 * adjust the texture/dest position and size accordingly.
1630 *
1631 * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
1632 */
1633 GLboolean
1634 _mesa_clip_copytexsubimage(const struct gl_context *ctx,
1635 GLint *destX, GLint *destY,
1636 GLint *srcX, GLint *srcY,
1637 GLsizei *width, GLsizei *height)
1638 {
1639 const struct gl_framebuffer *fb = ctx->ReadBuffer;
1640 const GLint srcX0 = *srcX, srcY0 = *srcY;
1641
1642 if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,
1643 srcX, srcY, width, height)) {
1644 *destX = *destX + *srcX - srcX0;
1645 *destY = *destY + *srcY - srcY0;
1646
1647 return GL_TRUE;
1648 }
1649 else {
1650 return GL_FALSE;
1651 }
1652 }
1653
1654
1655
1656 /**
1657 * Clip the rectangle defined by (x, y, width, height) against the bounds
1658 * specified by [xmin, xmax) and [ymin, ymax).
1659 * \return GL_FALSE if rect is totally clipped, GL_TRUE otherwise.
1660 */
1661 GLboolean
1662 _mesa_clip_to_region(GLint xmin, GLint ymin,
1663 GLint xmax, GLint ymax,
1664 GLint *x, GLint *y,
1665 GLsizei *width, GLsizei *height )
1666 {
1667 /* left clipping */
1668 if (*x < xmin) {
1669 *width -= (xmin - *x);
1670 *x = xmin;
1671 }
1672
1673 /* right clipping */
1674 if (*x + *width > xmax)
1675 *width -= (*x + *width - xmax);
1676
1677 if (*width <= 0)
1678 return GL_FALSE;
1679
1680 /* bottom (or top) clipping */
1681 if (*y < ymin) {
1682 *height -= (ymin - *y);
1683 *y = ymin;
1684 }
1685
1686 /* top (or bottom) clipping */
1687 if (*y + *height > ymax)
1688 *height -= (*y + *height - ymax);
1689
1690 if (*height <= 0)
1691 return GL_FALSE;
1692
1693 return GL_TRUE;
1694 }
1695
1696
1697 /**
1698 * Clip dst coords against Xmax (or Ymax).
1699 */
1700 static INLINE void
1701 clip_right_or_top(GLint *srcX0, GLint *srcX1,
1702 GLint *dstX0, GLint *dstX1,
1703 GLint maxValue)
1704 {
1705 GLfloat t, bias;
1706
1707 if (*dstX1 > maxValue) {
1708 /* X1 outside right edge */
1709 ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */
1710 t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1711 /* chop off [t, 1] part */
1712 ASSERT(t >= 0.0 && t <= 1.0);
1713 *dstX1 = maxValue;
1714 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1715 *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1716 }
1717 else if (*dstX0 > maxValue) {
1718 /* X0 outside right edge */
1719 ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */
1720 t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1721 /* chop off [t, 1] part */
1722 ASSERT(t >= 0.0 && t <= 1.0);
1723 *dstX0 = maxValue;
1724 bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;
1725 *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1726 }
1727 }
1728
1729
1730 /**
1731 * Clip dst coords against Xmin (or Ymin).
1732 */
1733 static INLINE void
1734 clip_left_or_bottom(GLint *srcX0, GLint *srcX1,
1735 GLint *dstX0, GLint *dstX1,
1736 GLint minValue)
1737 {
1738 GLfloat t, bias;
1739
1740 if (*dstX0 < minValue) {
1741 /* X0 outside left edge */
1742 ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */
1743 t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1744 /* chop off [0, t] part */
1745 ASSERT(t >= 0.0 && t <= 1.0);
1746 *dstX0 = minValue;
1747 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */
1748 *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1749 }
1750 else if (*dstX1 < minValue) {
1751 /* X1 outside left edge */
1752 ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */
1753 t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1754 /* chop off [0, t] part */
1755 ASSERT(t >= 0.0 && t <= 1.0);
1756 *dstX1 = minValue;
1757 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1758 *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1759 }
1760 }
1761
1762
1763 /**
1764 * Do clipping of blit src/dest rectangles.
1765 * The dest rect is clipped against both the buffer bounds and scissor bounds.
1766 * The src rect is just clipped against the buffer bounds.
1767 *
1768 * When either the src or dest rect is clipped, the other is also clipped
1769 * proportionately!
1770 *
1771 * Note that X0 need not be less than X1 (same for Y) for either the source
1772 * and dest rects. That makes the clipping a little trickier.
1773 *
1774 * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped
1775 */
1776 GLboolean
1777 _mesa_clip_blit(struct gl_context *ctx,
1778 GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1,
1779 GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1)
1780 {
1781 const GLint srcXmin = 0;
1782 const GLint srcXmax = ctx->ReadBuffer->Width;
1783 const GLint srcYmin = 0;
1784 const GLint srcYmax = ctx->ReadBuffer->Height;
1785
1786 /* these include scissor bounds */
1787 const GLint dstXmin = ctx->DrawBuffer->_Xmin;
1788 const GLint dstXmax = ctx->DrawBuffer->_Xmax;
1789 const GLint dstYmin = ctx->DrawBuffer->_Ymin;
1790 const GLint dstYmax = ctx->DrawBuffer->_Ymax;
1791
1792 /*
1793 printf("PreClipX: src: %d .. %d dst: %d .. %d\n",
1794 *srcX0, *srcX1, *dstX0, *dstX1);
1795 printf("PreClipY: src: %d .. %d dst: %d .. %d\n",
1796 *srcY0, *srcY1, *dstY0, *dstY1);
1797 */
1798
1799 /* trivial rejection tests */
1800 if (*dstX0 == *dstX1)
1801 return GL_FALSE; /* no width */
1802 if (*dstX0 <= dstXmin && *dstX1 <= dstXmin)
1803 return GL_FALSE; /* totally out (left) of bounds */
1804 if (*dstX0 >= dstXmax && *dstX1 >= dstXmax)
1805 return GL_FALSE; /* totally out (right) of bounds */
1806
1807 if (*dstY0 == *dstY1)
1808 return GL_FALSE;
1809 if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)
1810 return GL_FALSE;
1811 if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)
1812 return GL_FALSE;
1813
1814 if (*srcX0 == *srcX1)
1815 return GL_FALSE;
1816 if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)
1817 return GL_FALSE;
1818 if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)
1819 return GL_FALSE;
1820
1821 if (*srcY0 == *srcY1)
1822 return GL_FALSE;
1823 if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)
1824 return GL_FALSE;
1825 if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)
1826 return GL_FALSE;
1827
1828 /*
1829 * dest clip
1830 */
1831 clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax);
1832 clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax);
1833 clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin);
1834 clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin);
1835
1836 /*
1837 * src clip (just swap src/dst values from above)
1838 */
1839 clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax);
1840 clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax);
1841 clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin);
1842 clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin);
1843
1844 /*
1845 printf("PostClipX: src: %d .. %d dst: %d .. %d\n",
1846 *srcX0, *srcX1, *dstX0, *dstX1);
1847 printf("PostClipY: src: %d .. %d dst: %d .. %d\n",
1848 *srcY0, *srcY1, *dstY0, *dstY1);
1849 */
1850
1851 ASSERT(*dstX0 >= dstXmin);
1852 ASSERT(*dstX0 <= dstXmax);
1853 ASSERT(*dstX1 >= dstXmin);
1854 ASSERT(*dstX1 <= dstXmax);
1855
1856 ASSERT(*dstY0 >= dstYmin);
1857 ASSERT(*dstY0 <= dstYmax);
1858 ASSERT(*dstY1 >= dstYmin);
1859 ASSERT(*dstY1 <= dstYmax);
1860
1861 ASSERT(*srcX0 >= srcXmin);
1862 ASSERT(*srcX0 <= srcXmax);
1863 ASSERT(*srcX1 >= srcXmin);
1864 ASSERT(*srcX1 <= srcXmax);
1865
1866 ASSERT(*srcY0 >= srcYmin);
1867 ASSERT(*srcY0 <= srcYmax);
1868 ASSERT(*srcY1 >= srcYmin);
1869 ASSERT(*srcY1 <= srcYmax);
1870
1871 return GL_TRUE;
1872 }