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72e944e11accdfa34aa28ab957e803586d3ae9c1
[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 #include "mfeatures.h"
39 #include "mtypes.h"
40
41
42
43 /**
44 * \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.
45 */
46 GLboolean
47 _mesa_type_is_packed(GLenum type)
48 {
49 switch (type) {
50 case GL_UNSIGNED_BYTE_3_3_2:
51 case GL_UNSIGNED_BYTE_2_3_3_REV:
52 case MESA_UNSIGNED_BYTE_4_4:
53 case GL_UNSIGNED_SHORT_5_6_5:
54 case GL_UNSIGNED_SHORT_5_6_5_REV:
55 case GL_UNSIGNED_SHORT_4_4_4_4:
56 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
57 case GL_UNSIGNED_SHORT_5_5_5_1:
58 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
59 case GL_UNSIGNED_INT_8_8_8_8:
60 case GL_UNSIGNED_INT_8_8_8_8_REV:
61 case GL_UNSIGNED_INT_10_10_10_2:
62 case GL_UNSIGNED_INT_2_10_10_10_REV:
63 case GL_UNSIGNED_SHORT_8_8_MESA:
64 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
65 case GL_UNSIGNED_INT_24_8_EXT:
66 case GL_UNSIGNED_INT_5_9_9_9_REV:
67 case GL_UNSIGNED_INT_10F_11F_11F_REV:
68 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
69 return GL_TRUE;
70 }
71
72 return GL_FALSE;
73 }
74
75
76
77 /**
78 * Flip the order of the 2 bytes in each word in the given array.
79 *
80 * \param p array.
81 * \param n number of words.
82 */
83 void
84 _mesa_swap2( GLushort *p, GLuint n )
85 {
86 GLuint i;
87 for (i = 0; i < n; i++) {
88 p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
89 }
90 }
91
92
93
94 /*
95 * Flip the order of the 4 bytes in each word in the given array.
96 */
97 void
98 _mesa_swap4( GLuint *p, GLuint n )
99 {
100 GLuint i, a, b;
101 for (i = 0; i < n; i++) {
102 b = p[i];
103 a = (b >> 24)
104 | ((b >> 8) & 0xff00)
105 | ((b << 8) & 0xff0000)
106 | ((b << 24) & 0xff000000);
107 p[i] = a;
108 }
109 }
110
111
112 /**
113 * Get the size of a GL data type.
114 *
115 * \param type GL data type.
116 *
117 * \return the size, in bytes, of the given data type, 0 if a GL_BITMAP, or -1
118 * if an invalid type enum.
119 */
120 GLint
121 _mesa_sizeof_type( GLenum type )
122 {
123 switch (type) {
124 case GL_BITMAP:
125 return 0;
126 case GL_UNSIGNED_BYTE:
127 return sizeof(GLubyte);
128 case GL_BYTE:
129 return sizeof(GLbyte);
130 case GL_UNSIGNED_SHORT:
131 return sizeof(GLushort);
132 case GL_SHORT:
133 return sizeof(GLshort);
134 case GL_UNSIGNED_INT:
135 return sizeof(GLuint);
136 case GL_INT:
137 return sizeof(GLint);
138 case GL_FLOAT:
139 return sizeof(GLfloat);
140 case GL_DOUBLE:
141 return sizeof(GLdouble);
142 case GL_HALF_FLOAT_ARB:
143 return sizeof(GLhalfARB);
144 case GL_FIXED:
145 return sizeof(GLfixed);
146 default:
147 return -1;
148 }
149 }
150
151
152 /**
153 * Same as _mesa_sizeof_type() but also accepting the packed pixel
154 * format data types.
155 */
156 GLint
157 _mesa_sizeof_packed_type( GLenum type )
158 {
159 switch (type) {
160 case GL_BITMAP:
161 return 0;
162 case GL_UNSIGNED_BYTE:
163 return sizeof(GLubyte);
164 case GL_BYTE:
165 return sizeof(GLbyte);
166 case GL_UNSIGNED_SHORT:
167 return sizeof(GLushort);
168 case GL_SHORT:
169 return sizeof(GLshort);
170 case GL_UNSIGNED_INT:
171 return sizeof(GLuint);
172 case GL_INT:
173 return sizeof(GLint);
174 case GL_HALF_FLOAT_ARB:
175 return sizeof(GLhalfARB);
176 case GL_FLOAT:
177 return sizeof(GLfloat);
178 case GL_UNSIGNED_BYTE_3_3_2:
179 case GL_UNSIGNED_BYTE_2_3_3_REV:
180 case MESA_UNSIGNED_BYTE_4_4:
181 return sizeof(GLubyte);
182 case GL_UNSIGNED_SHORT_5_6_5:
183 case GL_UNSIGNED_SHORT_5_6_5_REV:
184 case GL_UNSIGNED_SHORT_4_4_4_4:
185 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
186 case GL_UNSIGNED_SHORT_5_5_5_1:
187 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
188 case GL_UNSIGNED_SHORT_8_8_MESA:
189 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
190 return sizeof(GLushort);
191 case GL_UNSIGNED_INT_8_8_8_8:
192 case GL_UNSIGNED_INT_8_8_8_8_REV:
193 case GL_UNSIGNED_INT_10_10_10_2:
194 case GL_UNSIGNED_INT_2_10_10_10_REV:
195 case GL_UNSIGNED_INT_24_8_EXT:
196 case GL_UNSIGNED_INT_5_9_9_9_REV:
197 case GL_UNSIGNED_INT_10F_11F_11F_REV:
198 return sizeof(GLuint);
199 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
200 return 8;
201 default:
202 return -1;
203 }
204 }
205
206
207 /**
208 * Get the number of components in a pixel format.
209 *
210 * \param format pixel format.
211 *
212 * \return the number of components in the given format, or -1 if a bad format.
213 */
214 GLint
215 _mesa_components_in_format( GLenum format )
216 {
217 switch (format) {
218 case GL_COLOR_INDEX:
219 case GL_STENCIL_INDEX:
220 case GL_DEPTH_COMPONENT:
221 case GL_RED:
222 case GL_RED_INTEGER_EXT:
223 case GL_GREEN:
224 case GL_GREEN_INTEGER_EXT:
225 case GL_BLUE:
226 case GL_BLUE_INTEGER_EXT:
227 case GL_ALPHA:
228 case GL_ALPHA_INTEGER_EXT:
229 case GL_LUMINANCE:
230 case GL_LUMINANCE_INTEGER_EXT:
231 case GL_INTENSITY:
232 return 1;
233
234 case GL_LUMINANCE_ALPHA:
235 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
236 case GL_RG:
237 case GL_YCBCR_MESA:
238 case GL_DEPTH_STENCIL_EXT:
239 case GL_DUDV_ATI:
240 case GL_DU8DV8_ATI:
241 return 2;
242
243 case GL_RGB:
244 case GL_BGR:
245 case GL_RGB_INTEGER_EXT:
246 case GL_BGR_INTEGER_EXT:
247 return 3;
248
249 case GL_RGBA:
250 case GL_BGRA:
251 case GL_ABGR_EXT:
252 case GL_RGBA_INTEGER_EXT:
253 case GL_BGRA_INTEGER_EXT:
254 return 4;
255
256 default:
257 return -1;
258 }
259 }
260
261
262 /**
263 * Get the bytes per pixel of pixel format type pair.
264 *
265 * \param format pixel format.
266 * \param type pixel type.
267 *
268 * \return bytes per pixel, or -1 if a bad format or type was given.
269 */
270 GLint
271 _mesa_bytes_per_pixel( GLenum format, GLenum type )
272 {
273 GLint comps = _mesa_components_in_format( format );
274 if (comps < 0)
275 return -1;
276
277 switch (type) {
278 case GL_BITMAP:
279 return 0; /* special case */
280 case GL_BYTE:
281 case GL_UNSIGNED_BYTE:
282 return comps * sizeof(GLubyte);
283 case GL_SHORT:
284 case GL_UNSIGNED_SHORT:
285 return comps * sizeof(GLshort);
286 case GL_INT:
287 case GL_UNSIGNED_INT:
288 return comps * sizeof(GLint);
289 case GL_FLOAT:
290 return comps * sizeof(GLfloat);
291 case GL_HALF_FLOAT_ARB:
292 return comps * sizeof(GLhalfARB);
293 case GL_UNSIGNED_BYTE_3_3_2:
294 case GL_UNSIGNED_BYTE_2_3_3_REV:
295 if (format == GL_RGB || format == GL_BGR ||
296 format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
297 return sizeof(GLubyte);
298 else
299 return -1; /* error */
300 case GL_UNSIGNED_SHORT_5_6_5:
301 case GL_UNSIGNED_SHORT_5_6_5_REV:
302 if (format == GL_RGB || format == GL_BGR ||
303 format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
304 return sizeof(GLushort);
305 else
306 return -1; /* error */
307 case GL_UNSIGNED_SHORT_4_4_4_4:
308 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
309 case GL_UNSIGNED_SHORT_5_5_5_1:
310 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
311 if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
312 format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
313 return sizeof(GLushort);
314 else
315 return -1;
316 case GL_UNSIGNED_INT_8_8_8_8:
317 case GL_UNSIGNED_INT_8_8_8_8_REV:
318 case GL_UNSIGNED_INT_10_10_10_2:
319 case GL_UNSIGNED_INT_2_10_10_10_REV:
320 if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
321 format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
322 return sizeof(GLuint);
323 else
324 return -1;
325 case GL_UNSIGNED_SHORT_8_8_MESA:
326 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
327 if (format == GL_YCBCR_MESA)
328 return sizeof(GLushort);
329 else
330 return -1;
331 case GL_UNSIGNED_INT_24_8_EXT:
332 if (format == GL_DEPTH_STENCIL_EXT)
333 return sizeof(GLuint);
334 else
335 return -1;
336 case GL_UNSIGNED_INT_5_9_9_9_REV:
337 if (format == GL_RGB)
338 return sizeof(GLuint);
339 else
340 return -1;
341 case GL_UNSIGNED_INT_10F_11F_11F_REV:
342 if (format == GL_RGB)
343 return sizeof(GLuint);
344 else
345 return -1;
346 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
347 if (format == GL_DEPTH_STENCIL)
348 return 8;
349 else
350 return -1;
351 default:
352 return -1;
353 }
354 }
355
356
357 /**
358 * Test for a legal pixel format and type.
359 *
360 * \param format pixel format.
361 * \param type pixel type.
362 *
363 * \return GL_TRUE if the given pixel format and type are legal, or GL_FALSE
364 * otherwise.
365 */
366 GLboolean
367 _mesa_is_legal_format_and_type(const struct gl_context *ctx,
368 GLenum format, GLenum type)
369 {
370 switch (format) {
371 case GL_COLOR_INDEX:
372 case GL_STENCIL_INDEX:
373 switch (type) {
374 case GL_BITMAP:
375 case GL_BYTE:
376 case GL_UNSIGNED_BYTE:
377 case GL_SHORT:
378 case GL_UNSIGNED_SHORT:
379 case GL_INT:
380 case GL_UNSIGNED_INT:
381 case GL_FLOAT:
382 return GL_TRUE;
383 case GL_HALF_FLOAT_ARB:
384 return ctx->Extensions.ARB_half_float_pixel;
385 default:
386 return GL_FALSE;
387 }
388 case GL_RED:
389 case GL_GREEN:
390 case GL_BLUE:
391 case GL_ALPHA:
392 #if 0 /* not legal! see table 3.6 of the 1.5 spec */
393 case GL_INTENSITY:
394 #endif
395 case GL_LUMINANCE:
396 case GL_LUMINANCE_ALPHA:
397 case GL_DEPTH_COMPONENT:
398 switch (type) {
399 case GL_BYTE:
400 case GL_UNSIGNED_BYTE:
401 case GL_SHORT:
402 case GL_UNSIGNED_SHORT:
403 case GL_INT:
404 case GL_UNSIGNED_INT:
405 case GL_FLOAT:
406 return GL_TRUE;
407 case GL_HALF_FLOAT_ARB:
408 return ctx->Extensions.ARB_half_float_pixel;
409 default:
410 return GL_FALSE;
411 }
412 case GL_RG:
413 if (!ctx->Extensions.ARB_texture_rg)
414 return GL_FALSE;
415
416 switch (type) {
417 case GL_BYTE:
418 case GL_UNSIGNED_BYTE:
419 case GL_SHORT:
420 case GL_UNSIGNED_SHORT:
421 case GL_INT:
422 case GL_UNSIGNED_INT:
423 case GL_FLOAT:
424 return GL_TRUE;
425 case GL_HALF_FLOAT_ARB:
426 return ctx->Extensions.ARB_half_float_pixel;
427 default:
428 return GL_FALSE;
429 }
430 case GL_RGB:
431 switch (type) {
432 case GL_BYTE:
433 case GL_UNSIGNED_BYTE:
434 case GL_SHORT:
435 case GL_UNSIGNED_SHORT:
436 case GL_INT:
437 case GL_UNSIGNED_INT:
438 case GL_FLOAT:
439 case GL_UNSIGNED_BYTE_3_3_2:
440 case GL_UNSIGNED_BYTE_2_3_3_REV:
441 case GL_UNSIGNED_SHORT_5_6_5:
442 case GL_UNSIGNED_SHORT_5_6_5_REV:
443 return GL_TRUE;
444 case GL_HALF_FLOAT_ARB:
445 return ctx->Extensions.ARB_half_float_pixel;
446 case GL_UNSIGNED_INT_5_9_9_9_REV:
447 return ctx->Extensions.EXT_texture_shared_exponent;
448 case GL_UNSIGNED_INT_10F_11F_11F_REV:
449 return ctx->Extensions.EXT_packed_float;
450 default:
451 return GL_FALSE;
452 }
453 case GL_BGR:
454 switch (type) {
455 /* NOTE: no packed types are supported with BGR. That's
456 * intentional, according to the GL spec.
457 */
458 case GL_BYTE:
459 case GL_UNSIGNED_BYTE:
460 case GL_SHORT:
461 case GL_UNSIGNED_SHORT:
462 case GL_INT:
463 case GL_UNSIGNED_INT:
464 case GL_FLOAT:
465 return GL_TRUE;
466 case GL_HALF_FLOAT_ARB:
467 return ctx->Extensions.ARB_half_float_pixel;
468 default:
469 return GL_FALSE;
470 }
471 case GL_RGBA:
472 case GL_BGRA:
473 case GL_ABGR_EXT:
474 switch (type) {
475 case GL_BYTE:
476 case GL_UNSIGNED_BYTE:
477 case GL_SHORT:
478 case GL_UNSIGNED_SHORT:
479 case GL_INT:
480 case GL_UNSIGNED_INT:
481 case GL_FLOAT:
482 case GL_UNSIGNED_SHORT_4_4_4_4:
483 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
484 case GL_UNSIGNED_SHORT_5_5_5_1:
485 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
486 case GL_UNSIGNED_INT_8_8_8_8:
487 case GL_UNSIGNED_INT_8_8_8_8_REV:
488 case GL_UNSIGNED_INT_10_10_10_2:
489 case GL_UNSIGNED_INT_2_10_10_10_REV:
490 return GL_TRUE;
491 case GL_HALF_FLOAT_ARB:
492 return ctx->Extensions.ARB_half_float_pixel;
493 default:
494 return GL_FALSE;
495 }
496 case GL_YCBCR_MESA:
497 if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
498 type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
499 return GL_TRUE;
500 else
501 return GL_FALSE;
502 case GL_DEPTH_STENCIL_EXT:
503 if ((ctx->Extensions.EXT_packed_depth_stencil &&
504 type == GL_UNSIGNED_INT_24_8_EXT) ||
505 (ctx->Extensions.ARB_depth_buffer_float &&
506 type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV))
507 return GL_TRUE;
508 else
509 return GL_FALSE;
510 case GL_DUDV_ATI:
511 case GL_DU8DV8_ATI:
512 switch (type) {
513 case GL_BYTE:
514 case GL_UNSIGNED_BYTE:
515 case GL_SHORT:
516 case GL_UNSIGNED_SHORT:
517 case GL_INT:
518 case GL_UNSIGNED_INT:
519 case GL_FLOAT:
520 return GL_TRUE;
521 default:
522 return GL_FALSE;
523 }
524
525 /* integer-valued formats */
526 case GL_RED_INTEGER_EXT:
527 case GL_GREEN_INTEGER_EXT:
528 case GL_BLUE_INTEGER_EXT:
529 case GL_ALPHA_INTEGER_EXT:
530 switch (type) {
531 case GL_BYTE:
532 case GL_UNSIGNED_BYTE:
533 case GL_SHORT:
534 case GL_UNSIGNED_SHORT:
535 case GL_INT:
536 case GL_UNSIGNED_INT:
537 return ctx->Extensions.EXT_texture_integer;
538 default:
539 return GL_FALSE;
540 }
541
542 case GL_RGB_INTEGER_EXT:
543 switch (type) {
544 case GL_BYTE:
545 case GL_UNSIGNED_BYTE:
546 case GL_SHORT:
547 case GL_UNSIGNED_SHORT:
548 case GL_INT:
549 case GL_UNSIGNED_INT:
550 return ctx->Extensions.EXT_texture_integer;
551 case GL_UNSIGNED_BYTE_3_3_2:
552 case GL_UNSIGNED_BYTE_2_3_3_REV:
553 case GL_UNSIGNED_SHORT_5_6_5:
554 case GL_UNSIGNED_SHORT_5_6_5_REV:
555 return ctx->Extensions.ARB_texture_rgb10_a2ui;
556 default:
557 return GL_FALSE;
558 }
559
560 case GL_BGR_INTEGER_EXT:
561 switch (type) {
562 case GL_BYTE:
563 case GL_UNSIGNED_BYTE:
564 case GL_SHORT:
565 case GL_UNSIGNED_SHORT:
566 case GL_INT:
567 case GL_UNSIGNED_INT:
568 /* NOTE: no packed formats w/ BGR format */
569 return ctx->Extensions.EXT_texture_integer;
570 default:
571 return GL_FALSE;
572 }
573
574 case GL_RGBA_INTEGER_EXT:
575 case GL_BGRA_INTEGER_EXT:
576 switch (type) {
577 case GL_BYTE:
578 case GL_UNSIGNED_BYTE:
579 case GL_SHORT:
580 case GL_UNSIGNED_SHORT:
581 case GL_INT:
582 case GL_UNSIGNED_INT:
583 return ctx->Extensions.EXT_texture_integer;
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.ARB_texture_rgb10_a2ui;
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 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
740 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
741 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
742 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
743 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
744 /* generic integer formats */
745 case GL_RED_INTEGER_EXT:
746 case GL_GREEN_INTEGER_EXT:
747 case GL_BLUE_INTEGER_EXT:
748 case GL_ALPHA_INTEGER_EXT:
749 case GL_RGB_INTEGER_EXT:
750 case GL_RGBA_INTEGER_EXT:
751 case GL_BGR_INTEGER_EXT:
752 case GL_BGRA_INTEGER_EXT:
753 case GL_LUMINANCE_INTEGER_EXT:
754 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
755 /* sized integer formats */
756 case GL_RGBA32UI_EXT:
757 case GL_RGB32UI_EXT:
758 case GL_ALPHA32UI_EXT:
759 case GL_INTENSITY32UI_EXT:
760 case GL_LUMINANCE32UI_EXT:
761 case GL_LUMINANCE_ALPHA32UI_EXT:
762 case GL_RGBA16UI_EXT:
763 case GL_RGB16UI_EXT:
764 case GL_ALPHA16UI_EXT:
765 case GL_INTENSITY16UI_EXT:
766 case GL_LUMINANCE16UI_EXT:
767 case GL_LUMINANCE_ALPHA16UI_EXT:
768 case GL_RGBA8UI_EXT:
769 case GL_RGB8UI_EXT:
770 case GL_ALPHA8UI_EXT:
771 case GL_INTENSITY8UI_EXT:
772 case GL_LUMINANCE8UI_EXT:
773 case GL_LUMINANCE_ALPHA8UI_EXT:
774 case GL_RGBA32I_EXT:
775 case GL_RGB32I_EXT:
776 case GL_ALPHA32I_EXT:
777 case GL_INTENSITY32I_EXT:
778 case GL_LUMINANCE32I_EXT:
779 case GL_LUMINANCE_ALPHA32I_EXT:
780 case GL_RGBA16I_EXT:
781 case GL_RGB16I_EXT:
782 case GL_ALPHA16I_EXT:
783 case GL_INTENSITY16I_EXT:
784 case GL_LUMINANCE16I_EXT:
785 case GL_LUMINANCE_ALPHA16I_EXT:
786 case GL_RGBA8I_EXT:
787 case GL_RGB8I_EXT:
788 case GL_ALPHA8I_EXT:
789 case GL_INTENSITY8I_EXT:
790 case GL_LUMINANCE8I_EXT:
791 case GL_LUMINANCE_ALPHA8I_EXT:
792 /* signed, normalized texture formats */
793 case GL_RED_SNORM:
794 case GL_R8_SNORM:
795 case GL_R16_SNORM:
796 case GL_RG_SNORM:
797 case GL_RG8_SNORM:
798 case GL_RG16_SNORM:
799 case GL_RGB_SNORM:
800 case GL_RGB8_SNORM:
801 case GL_RGB16_SNORM:
802 case GL_RGBA_SNORM:
803 case GL_RGBA8_SNORM:
804 case GL_RGBA16_SNORM:
805 case GL_ALPHA_SNORM:
806 case GL_ALPHA8_SNORM:
807 case GL_ALPHA16_SNORM:
808 case GL_LUMINANCE_SNORM:
809 case GL_LUMINANCE8_SNORM:
810 case GL_LUMINANCE16_SNORM:
811 case GL_LUMINANCE_ALPHA_SNORM:
812 case GL_LUMINANCE8_ALPHA8_SNORM:
813 case GL_LUMINANCE16_ALPHA16_SNORM:
814 case GL_INTENSITY_SNORM:
815 case GL_INTENSITY8_SNORM:
816 case GL_INTENSITY16_SNORM:
817 case GL_RGB9_E5:
818 case GL_R11F_G11F_B10F:
819 return GL_TRUE;
820 case GL_YCBCR_MESA: /* not considered to be RGB */
821 /* fall-through */
822 default:
823 return GL_FALSE;
824 }
825 }
826
827
828 /**
829 * Test if the given image format is a depth component format.
830 */
831 GLboolean
832 _mesa_is_depth_format(GLenum format)
833 {
834 switch (format) {
835 case GL_DEPTH_COMPONENT:
836 case GL_DEPTH_COMPONENT16:
837 case GL_DEPTH_COMPONENT24:
838 case GL_DEPTH_COMPONENT32:
839 case GL_DEPTH_COMPONENT32F:
840 return GL_TRUE;
841 default:
842 return GL_FALSE;
843 }
844 }
845
846
847 /**
848 * Test if the given image format is a stencil format.
849 */
850 GLboolean
851 _mesa_is_stencil_format(GLenum format)
852 {
853 switch (format) {
854 case GL_STENCIL_INDEX:
855 case GL_DEPTH_STENCIL:
856 return GL_TRUE;
857 default:
858 return GL_FALSE;
859 }
860 }
861
862
863 /**
864 * Test if the given image format is a YCbCr format.
865 */
866 GLboolean
867 _mesa_is_ycbcr_format(GLenum format)
868 {
869 switch (format) {
870 case GL_YCBCR_MESA:
871 return GL_TRUE;
872 default:
873 return GL_FALSE;
874 }
875 }
876
877
878 /**
879 * Test if the given image format is a depth+stencil format.
880 */
881 GLboolean
882 _mesa_is_depthstencil_format(GLenum format)
883 {
884 switch (format) {
885 case GL_DEPTH24_STENCIL8_EXT:
886 case GL_DEPTH_STENCIL_EXT:
887 case GL_DEPTH32F_STENCIL8:
888 return GL_TRUE;
889 default:
890 return GL_FALSE;
891 }
892 }
893
894
895 /**
896 * Test if the given image format is a depth or stencil format.
897 */
898 GLboolean
899 _mesa_is_depth_or_stencil_format(GLenum format)
900 {
901 switch (format) {
902 case GL_DEPTH_COMPONENT:
903 case GL_DEPTH_COMPONENT16:
904 case GL_DEPTH_COMPONENT24:
905 case GL_DEPTH_COMPONENT32:
906 case GL_STENCIL_INDEX:
907 case GL_STENCIL_INDEX1_EXT:
908 case GL_STENCIL_INDEX4_EXT:
909 case GL_STENCIL_INDEX8_EXT:
910 case GL_STENCIL_INDEX16_EXT:
911 case GL_DEPTH_STENCIL_EXT:
912 case GL_DEPTH24_STENCIL8_EXT:
913 case GL_DEPTH_COMPONENT32F:
914 case GL_DEPTH32F_STENCIL8:
915 return GL_TRUE;
916 default:
917 return GL_FALSE;
918 }
919 }
920
921
922 /**
923 * Test if the given image format is a dudv format.
924 */
925 GLboolean
926 _mesa_is_dudv_format(GLenum format)
927 {
928 switch (format) {
929 case GL_DUDV_ATI:
930 case GL_DU8DV8_ATI:
931 return GL_TRUE;
932 default:
933 return GL_FALSE;
934 }
935 }
936
937
938 /**
939 * Test if the given format is an integer (non-normalized) format.
940 */
941 GLboolean
942 _mesa_is_integer_format(GLenum format)
943 {
944 switch (format) {
945 /* generic integer formats */
946 case GL_RED_INTEGER_EXT:
947 case GL_GREEN_INTEGER_EXT:
948 case GL_BLUE_INTEGER_EXT:
949 case GL_ALPHA_INTEGER_EXT:
950 case GL_RGB_INTEGER_EXT:
951 case GL_RGBA_INTEGER_EXT:
952 case GL_BGR_INTEGER_EXT:
953 case GL_BGRA_INTEGER_EXT:
954 case GL_LUMINANCE_INTEGER_EXT:
955 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
956 /* specific integer formats */
957 case GL_RGBA32UI_EXT:
958 case GL_RGB32UI_EXT:
959 case GL_RG32UI:
960 case GL_R32UI:
961 case GL_ALPHA32UI_EXT:
962 case GL_INTENSITY32UI_EXT:
963 case GL_LUMINANCE32UI_EXT:
964 case GL_LUMINANCE_ALPHA32UI_EXT:
965 case GL_RGBA16UI_EXT:
966 case GL_RGB16UI_EXT:
967 case GL_RG16UI:
968 case GL_R16UI:
969 case GL_ALPHA16UI_EXT:
970 case GL_INTENSITY16UI_EXT:
971 case GL_LUMINANCE16UI_EXT:
972 case GL_LUMINANCE_ALPHA16UI_EXT:
973 case GL_RGBA8UI_EXT:
974 case GL_RGB8UI_EXT:
975 case GL_RG8UI:
976 case GL_R8UI:
977 case GL_ALPHA8UI_EXT:
978 case GL_INTENSITY8UI_EXT:
979 case GL_LUMINANCE8UI_EXT:
980 case GL_LUMINANCE_ALPHA8UI_EXT:
981 case GL_RGBA32I_EXT:
982 case GL_RGB32I_EXT:
983 case GL_RG32I:
984 case GL_R32I:
985 case GL_ALPHA32I_EXT:
986 case GL_INTENSITY32I_EXT:
987 case GL_LUMINANCE32I_EXT:
988 case GL_LUMINANCE_ALPHA32I_EXT:
989 case GL_RGBA16I_EXT:
990 case GL_RGB16I_EXT:
991 case GL_RG16I:
992 case GL_R16I:
993 case GL_ALPHA16I_EXT:
994 case GL_INTENSITY16I_EXT:
995 case GL_LUMINANCE16I_EXT:
996 case GL_LUMINANCE_ALPHA16I_EXT:
997 case GL_RGBA8I_EXT:
998 case GL_RGB8I_EXT:
999 case GL_RG8I:
1000 case GL_R8I:
1001 case GL_ALPHA8I_EXT:
1002 case GL_INTENSITY8I_EXT:
1003 case GL_LUMINANCE8I_EXT:
1004 case GL_LUMINANCE_ALPHA8I_EXT:
1005 return GL_TRUE;
1006 default:
1007 return GL_FALSE;
1008 }
1009 }
1010
1011
1012 /**
1013 * Test if an image format is a supported compressed format.
1014 * \param format the internal format token provided by the user.
1015 * \return GL_TRUE if compressed, GL_FALSE if uncompressed
1016 */
1017 GLboolean
1018 _mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
1019 {
1020 switch (format) {
1021 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
1022 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
1023 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
1024 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
1025 return ctx->Extensions.EXT_texture_compression_s3tc;
1026 case GL_RGB_S3TC:
1027 case GL_RGB4_S3TC:
1028 case GL_RGBA_S3TC:
1029 case GL_RGBA4_S3TC:
1030 return ctx->Extensions.S3_s3tc;
1031 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
1032 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
1033 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
1034 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
1035 return ctx->Extensions.EXT_texture_sRGB
1036 && ctx->Extensions.EXT_texture_compression_s3tc;
1037 case GL_COMPRESSED_RGB_FXT1_3DFX:
1038 case GL_COMPRESSED_RGBA_FXT1_3DFX:
1039 return ctx->Extensions.TDFX_texture_compression_FXT1;
1040 case GL_COMPRESSED_RED_RGTC1:
1041 case GL_COMPRESSED_SIGNED_RED_RGTC1:
1042 case GL_COMPRESSED_RG_RGTC2:
1043 case GL_COMPRESSED_SIGNED_RG_RGTC2:
1044 return ctx->Extensions.ARB_texture_compression_rgtc;
1045 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
1046 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
1047 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
1048 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
1049 return ctx->Extensions.EXT_texture_compression_latc;
1050 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
1051 return ctx->Extensions.ATI_texture_compression_3dc;
1052 #if FEATURE_ES
1053 case GL_PALETTE4_RGB8_OES:
1054 case GL_PALETTE4_RGBA8_OES:
1055 case GL_PALETTE4_R5_G6_B5_OES:
1056 case GL_PALETTE4_RGBA4_OES:
1057 case GL_PALETTE4_RGB5_A1_OES:
1058 case GL_PALETTE8_RGB8_OES:
1059 case GL_PALETTE8_RGBA8_OES:
1060 case GL_PALETTE8_R5_G6_B5_OES:
1061 case GL_PALETTE8_RGBA4_OES:
1062 case GL_PALETTE8_RGB5_A1_OES:
1063 return ctx->API == API_OPENGLES;
1064 #endif
1065 default:
1066 return GL_FALSE;
1067 }
1068 }
1069
1070
1071 /**
1072 * Return the address of a specific pixel in an image (1D, 2D or 3D).
1073 *
1074 * Pixel unpacking/packing parameters are observed according to \p packing.
1075 *
1076 * \param dimensions either 1, 2 or 3 to indicate dimensionality of image
1077 * \param image starting address of image data
1078 * \param width the image width
1079 * \param height theimage height
1080 * \param format the pixel format
1081 * \param type the pixel data type
1082 * \param packing the pixelstore attributes
1083 * \param img which image in the volume (0 for 1D or 2D images)
1084 * \param row row of pixel in the image (0 for 1D images)
1085 * \param column column of pixel in the image
1086 *
1087 * \return address of pixel on success, or NULL on error.
1088 *
1089 * \sa gl_pixelstore_attrib.
1090 */
1091 GLvoid *
1092 _mesa_image_address( GLuint dimensions,
1093 const struct gl_pixelstore_attrib *packing,
1094 const GLvoid *image,
1095 GLsizei width, GLsizei height,
1096 GLenum format, GLenum type,
1097 GLint img, GLint row, GLint column )
1098 {
1099 GLint alignment; /* 1, 2 or 4 */
1100 GLint pixels_per_row;
1101 GLint rows_per_image;
1102 GLint skiprows;
1103 GLint skippixels;
1104 GLint skipimages; /* for 3-D volume images */
1105 GLubyte *pixel_addr;
1106
1107 ASSERT(dimensions >= 1 && dimensions <= 3);
1108
1109 alignment = packing->Alignment;
1110 if (packing->RowLength > 0) {
1111 pixels_per_row = packing->RowLength;
1112 }
1113 else {
1114 pixels_per_row = width;
1115 }
1116 if (packing->ImageHeight > 0) {
1117 rows_per_image = packing->ImageHeight;
1118 }
1119 else {
1120 rows_per_image = height;
1121 }
1122
1123 skippixels = packing->SkipPixels;
1124 /* Note: SKIP_ROWS _is_ used for 1D images */
1125 skiprows = packing->SkipRows;
1126 /* Note: SKIP_IMAGES is only used for 3D images */
1127 skipimages = (dimensions == 3) ? packing->SkipImages : 0;
1128
1129 if (type == GL_BITMAP) {
1130 /* BITMAP data */
1131 GLint comp_per_pixel; /* components per pixel */
1132 GLint bytes_per_comp; /* bytes per component */
1133 GLint bytes_per_row;
1134 GLint bytes_per_image;
1135
1136 /* Compute bytes per component */
1137 bytes_per_comp = _mesa_sizeof_packed_type( type );
1138 if (bytes_per_comp < 0) {
1139 return NULL;
1140 }
1141
1142 /* Compute number of components per pixel */
1143 comp_per_pixel = _mesa_components_in_format( format );
1144 if (comp_per_pixel < 0) {
1145 return NULL;
1146 }
1147
1148 bytes_per_row = alignment
1149 * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
1150
1151 bytes_per_image = bytes_per_row * rows_per_image;
1152
1153 pixel_addr = (GLubyte *) image
1154 + (skipimages + img) * bytes_per_image
1155 + (skiprows + row) * bytes_per_row
1156 + (skippixels + column) / 8;
1157 }
1158 else {
1159 /* Non-BITMAP data */
1160 GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
1161 GLint topOfImage;
1162
1163 bytes_per_pixel = _mesa_bytes_per_pixel( format, type );
1164
1165 /* The pixel type and format should have been error checked earlier */
1166 assert(bytes_per_pixel > 0);
1167
1168 bytes_per_row = pixels_per_row * bytes_per_pixel;
1169 remainder = bytes_per_row % alignment;
1170 if (remainder > 0)
1171 bytes_per_row += (alignment - remainder);
1172
1173 ASSERT(bytes_per_row % alignment == 0);
1174
1175 bytes_per_image = bytes_per_row * rows_per_image;
1176
1177 if (packing->Invert) {
1178 /* set pixel_addr to the last row */
1179 topOfImage = bytes_per_row * (height - 1);
1180 bytes_per_row = -bytes_per_row;
1181 }
1182 else {
1183 topOfImage = 0;
1184 }
1185
1186 /* compute final pixel address */
1187 pixel_addr = (GLubyte *) image
1188 + (skipimages + img) * bytes_per_image
1189 + topOfImage
1190 + (skiprows + row) * bytes_per_row
1191 + (skippixels + column) * bytes_per_pixel;
1192 }
1193
1194 return (GLvoid *) pixel_addr;
1195 }
1196
1197
1198 GLvoid *
1199 _mesa_image_address1d( const struct gl_pixelstore_attrib *packing,
1200 const GLvoid *image,
1201 GLsizei width,
1202 GLenum format, GLenum type,
1203 GLint column )
1204 {
1205 return _mesa_image_address(1, packing, image, width, 1,
1206 format, type, 0, 0, column);
1207 }
1208
1209
1210 GLvoid *
1211 _mesa_image_address2d( const struct gl_pixelstore_attrib *packing,
1212 const GLvoid *image,
1213 GLsizei width, GLsizei height,
1214 GLenum format, GLenum type,
1215 GLint row, GLint column )
1216 {
1217 return _mesa_image_address(2, packing, image, width, height,
1218 format, type, 0, row, column);
1219 }
1220
1221
1222 GLvoid *
1223 _mesa_image_address3d( const struct gl_pixelstore_attrib *packing,
1224 const GLvoid *image,
1225 GLsizei width, GLsizei height,
1226 GLenum format, GLenum type,
1227 GLint img, GLint row, GLint column )
1228 {
1229 return _mesa_image_address(3, packing, image, width, height,
1230 format, type, img, row, column);
1231 }
1232
1233
1234
1235 /**
1236 * Compute the stride (in bytes) between image rows.
1237 *
1238 * \param packing the pixelstore attributes
1239 * \param width image width.
1240 * \param format pixel format.
1241 * \param type pixel data type.
1242 *
1243 * \return the stride in bytes for the given parameters, or -1 if error
1244 */
1245 GLint
1246 _mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
1247 GLint width, GLenum format, GLenum type )
1248 {
1249 GLint bytesPerRow, remainder;
1250
1251 ASSERT(packing);
1252
1253 if (type == GL_BITMAP) {
1254 if (packing->RowLength == 0) {
1255 bytesPerRow = (width + 7) / 8;
1256 }
1257 else {
1258 bytesPerRow = (packing->RowLength + 7) / 8;
1259 }
1260 }
1261 else {
1262 /* Non-BITMAP data */
1263 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1264 if (bytesPerPixel <= 0)
1265 return -1; /* error */
1266 if (packing->RowLength == 0) {
1267 bytesPerRow = bytesPerPixel * width;
1268 }
1269 else {
1270 bytesPerRow = bytesPerPixel * packing->RowLength;
1271 }
1272 }
1273
1274 remainder = bytesPerRow % packing->Alignment;
1275 if (remainder > 0) {
1276 bytesPerRow += (packing->Alignment - remainder);
1277 }
1278
1279 if (packing->Invert) {
1280 /* negate the bytes per row (negative row stride) */
1281 bytesPerRow = -bytesPerRow;
1282 }
1283
1284 return bytesPerRow;
1285 }
1286
1287
1288 /*
1289 * Compute the stride between images in a 3D texture (in bytes) for the given
1290 * pixel packing parameters and image width, format and type.
1291 */
1292 GLint
1293 _mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
1294 GLint width, GLint height,
1295 GLenum format, GLenum type )
1296 {
1297 GLint bytesPerRow, bytesPerImage, remainder;
1298
1299 ASSERT(packing);
1300
1301 if (type == GL_BITMAP) {
1302 if (packing->RowLength == 0) {
1303 bytesPerRow = (width + 7) / 8;
1304 }
1305 else {
1306 bytesPerRow = (packing->RowLength + 7) / 8;
1307 }
1308 }
1309 else {
1310 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1311
1312 if (bytesPerPixel <= 0)
1313 return -1; /* error */
1314 if (packing->RowLength == 0) {
1315 bytesPerRow = bytesPerPixel * width;
1316 }
1317 else {
1318 bytesPerRow = bytesPerPixel * packing->RowLength;
1319 }
1320 }
1321
1322 remainder = bytesPerRow % packing->Alignment;
1323 if (remainder > 0)
1324 bytesPerRow += (packing->Alignment - remainder);
1325
1326 if (packing->ImageHeight == 0)
1327 bytesPerImage = bytesPerRow * height;
1328 else
1329 bytesPerImage = bytesPerRow * packing->ImageHeight;
1330
1331 return bytesPerImage;
1332 }
1333
1334
1335
1336 /**
1337 * "Expand" a bitmap from 1-bit per pixel to 8-bits per pixel.
1338 * This is typically used to convert a bitmap into a GLubyte/pixel texture.
1339 * "On" bits will set texels to \p onValue.
1340 * "Off" bits will not modify texels.
1341 * \param width src bitmap width in pixels
1342 * \param height src bitmap height in pixels
1343 * \param unpack bitmap unpacking state
1344 * \param bitmap the src bitmap data
1345 * \param destBuffer start of dest buffer
1346 * \param destStride row stride in dest buffer
1347 * \param onValue if bit is 1, set destBuffer pixel to this value
1348 */
1349 void
1350 _mesa_expand_bitmap(GLsizei width, GLsizei height,
1351 const struct gl_pixelstore_attrib *unpack,
1352 const GLubyte *bitmap,
1353 GLubyte *destBuffer, GLint destStride,
1354 GLubyte onValue)
1355 {
1356 const GLubyte *srcRow = (const GLubyte *)
1357 _mesa_image_address2d(unpack, bitmap, width, height,
1358 GL_COLOR_INDEX, GL_BITMAP, 0, 0);
1359 const GLint srcStride = _mesa_image_row_stride(unpack, width,
1360 GL_COLOR_INDEX, GL_BITMAP);
1361 GLint row, col;
1362
1363 #define SET_PIXEL(COL, ROW) \
1364 destBuffer[(ROW) * destStride + (COL)] = onValue;
1365
1366 for (row = 0; row < height; row++) {
1367 const GLubyte *src = srcRow;
1368
1369 if (unpack->LsbFirst) {
1370 /* Lsb first */
1371 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
1372 for (col = 0; col < width; col++) {
1373
1374 if (*src & mask) {
1375 SET_PIXEL(col, row);
1376 }
1377
1378 if (mask == 128U) {
1379 src++;
1380 mask = 1U;
1381 }
1382 else {
1383 mask = mask << 1;
1384 }
1385 }
1386
1387 /* get ready for next row */
1388 if (mask != 1)
1389 src++;
1390 }
1391 else {
1392 /* Msb first */
1393 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
1394 for (col = 0; col < width; col++) {
1395
1396 if (*src & mask) {
1397 SET_PIXEL(col, row);
1398 }
1399
1400 if (mask == 1U) {
1401 src++;
1402 mask = 128U;
1403 }
1404 else {
1405 mask = mask >> 1;
1406 }
1407 }
1408
1409 /* get ready for next row */
1410 if (mask != 128)
1411 src++;
1412 }
1413
1414 srcRow += srcStride;
1415 } /* row */
1416
1417 #undef SET_PIXEL
1418 }
1419
1420
1421
1422
1423 /**
1424 * Convert an array of RGBA colors from one datatype to another.
1425 * NOTE: src may equal dst. In that case, we use a temporary buffer.
1426 */
1427 void
1428 _mesa_convert_colors(GLenum srcType, const GLvoid *src,
1429 GLenum dstType, GLvoid *dst,
1430 GLuint count, const GLubyte mask[])
1431 {
1432 GLuint tempBuffer[MAX_WIDTH][4];
1433 const GLboolean useTemp = (src == dst);
1434
1435 ASSERT(srcType != dstType);
1436
1437 switch (srcType) {
1438 case GL_UNSIGNED_BYTE:
1439 if (dstType == GL_UNSIGNED_SHORT) {
1440 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1441 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1442 GLuint i;
1443 for (i = 0; i < count; i++) {
1444 if (!mask || mask[i]) {
1445 dst2[i][RCOMP] = UBYTE_TO_USHORT(src1[i][RCOMP]);
1446 dst2[i][GCOMP] = UBYTE_TO_USHORT(src1[i][GCOMP]);
1447 dst2[i][BCOMP] = UBYTE_TO_USHORT(src1[i][BCOMP]);
1448 dst2[i][ACOMP] = UBYTE_TO_USHORT(src1[i][ACOMP]);
1449 }
1450 }
1451 if (useTemp)
1452 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1453 }
1454 else {
1455 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1456 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1457 GLuint i;
1458 ASSERT(dstType == GL_FLOAT);
1459 for (i = 0; i < count; i++) {
1460 if (!mask || mask[i]) {
1461 dst4[i][RCOMP] = UBYTE_TO_FLOAT(src1[i][RCOMP]);
1462 dst4[i][GCOMP] = UBYTE_TO_FLOAT(src1[i][GCOMP]);
1463 dst4[i][BCOMP] = UBYTE_TO_FLOAT(src1[i][BCOMP]);
1464 dst4[i][ACOMP] = UBYTE_TO_FLOAT(src1[i][ACOMP]);
1465 }
1466 }
1467 if (useTemp)
1468 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1469 }
1470 break;
1471 case GL_UNSIGNED_SHORT:
1472 if (dstType == GL_UNSIGNED_BYTE) {
1473 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1474 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1475 GLuint i;
1476 for (i = 0; i < count; i++) {
1477 if (!mask || mask[i]) {
1478 dst1[i][RCOMP] = USHORT_TO_UBYTE(src2[i][RCOMP]);
1479 dst1[i][GCOMP] = USHORT_TO_UBYTE(src2[i][GCOMP]);
1480 dst1[i][BCOMP] = USHORT_TO_UBYTE(src2[i][BCOMP]);
1481 dst1[i][ACOMP] = USHORT_TO_UBYTE(src2[i][ACOMP]);
1482 }
1483 }
1484 if (useTemp)
1485 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1486 }
1487 else {
1488 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1489 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1490 GLuint i;
1491 ASSERT(dstType == GL_FLOAT);
1492 for (i = 0; i < count; i++) {
1493 if (!mask || mask[i]) {
1494 dst4[i][RCOMP] = USHORT_TO_FLOAT(src2[i][RCOMP]);
1495 dst4[i][GCOMP] = USHORT_TO_FLOAT(src2[i][GCOMP]);
1496 dst4[i][BCOMP] = USHORT_TO_FLOAT(src2[i][BCOMP]);
1497 dst4[i][ACOMP] = USHORT_TO_FLOAT(src2[i][ACOMP]);
1498 }
1499 }
1500 if (useTemp)
1501 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1502 }
1503 break;
1504 case GL_FLOAT:
1505 if (dstType == GL_UNSIGNED_BYTE) {
1506 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1507 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1508 GLuint i;
1509 for (i = 0; i < count; i++) {
1510 if (!mask || mask[i])
1511 _mesa_unclamped_float_rgba_to_ubyte(dst1[i], src4[i]);
1512 }
1513 if (useTemp)
1514 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1515 }
1516 else {
1517 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1518 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1519 GLuint i;
1520 ASSERT(dstType == GL_UNSIGNED_SHORT);
1521 for (i = 0; i < count; i++) {
1522 if (!mask || mask[i]) {
1523 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][RCOMP], src4[i][RCOMP]);
1524 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][GCOMP], src4[i][GCOMP]);
1525 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][BCOMP], src4[i][BCOMP]);
1526 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][ACOMP], src4[i][ACOMP]);
1527 }
1528 }
1529 if (useTemp)
1530 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1531 }
1532 break;
1533 default:
1534 _mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");
1535 }
1536 }
1537
1538
1539
1540
1541 /**
1542 * Perform basic clipping for glDrawPixels. The image's position and size
1543 * and the unpack SkipPixels and SkipRows are adjusted so that the image
1544 * region is entirely within the window and scissor bounds.
1545 * NOTE: this will only work when glPixelZoom is (1, 1) or (1, -1).
1546 * If Pixel.ZoomY is -1, *destY will be changed to be the first row which
1547 * we'll actually write. Beforehand, *destY-1 is the first drawing row.
1548 *
1549 * \return GL_TRUE if image is ready for drawing or
1550 * GL_FALSE if image was completely clipped away (draw nothing)
1551 */
1552 GLboolean
1553 _mesa_clip_drawpixels(const struct gl_context *ctx,
1554 GLint *destX, GLint *destY,
1555 GLsizei *width, GLsizei *height,
1556 struct gl_pixelstore_attrib *unpack)
1557 {
1558 const struct gl_framebuffer *buffer = ctx->DrawBuffer;
1559
1560 if (unpack->RowLength == 0) {
1561 unpack->RowLength = *width;
1562 }
1563
1564 ASSERT(ctx->Pixel.ZoomX == 1.0F);
1565 ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);
1566
1567 /* left clipping */
1568 if (*destX < buffer->_Xmin) {
1569 unpack->SkipPixels += (buffer->_Xmin - *destX);
1570 *width -= (buffer->_Xmin - *destX);
1571 *destX = buffer->_Xmin;
1572 }
1573 /* right clipping */
1574 if (*destX + *width > buffer->_Xmax)
1575 *width -= (*destX + *width - buffer->_Xmax);
1576
1577 if (*width <= 0)
1578 return GL_FALSE;
1579
1580 if (ctx->Pixel.ZoomY == 1.0F) {
1581 /* bottom clipping */
1582 if (*destY < buffer->_Ymin) {
1583 unpack->SkipRows += (buffer->_Ymin - *destY);
1584 *height -= (buffer->_Ymin - *destY);
1585 *destY = buffer->_Ymin;
1586 }
1587 /* top clipping */
1588 if (*destY + *height > buffer->_Ymax)
1589 *height -= (*destY + *height - buffer->_Ymax);
1590 }
1591 else { /* upside down */
1592 /* top clipping */
1593 if (*destY > buffer->_Ymax) {
1594 unpack->SkipRows += (*destY - buffer->_Ymax);
1595 *height -= (*destY - buffer->_Ymax);
1596 *destY = buffer->_Ymax;
1597 }
1598 /* bottom clipping */
1599 if (*destY - *height < buffer->_Ymin)
1600 *height -= (buffer->_Ymin - (*destY - *height));
1601 /* adjust destY so it's the first row to write to */
1602 (*destY)--;
1603 }
1604
1605 if (*height <= 0)
1606 return GL_FALSE;
1607
1608 return GL_TRUE;
1609 }
1610
1611
1612 /**
1613 * Perform clipping for glReadPixels. The image's window position
1614 * and size, and the pack skipPixels, skipRows and rowLength are adjusted
1615 * so that the image region is entirely within the window bounds.
1616 * Note: this is different from _mesa_clip_drawpixels() in that the
1617 * scissor box is ignored, and we use the bounds of the current readbuffer
1618 * surface.
1619 *
1620 * \return GL_TRUE if region to read is in bounds
1621 * GL_FALSE if region is completely out of bounds (nothing to read)
1622 */
1623 GLboolean
1624 _mesa_clip_readpixels(const struct gl_context *ctx,
1625 GLint *srcX, GLint *srcY,
1626 GLsizei *width, GLsizei *height,
1627 struct gl_pixelstore_attrib *pack)
1628 {
1629 const struct gl_framebuffer *buffer = ctx->ReadBuffer;
1630
1631 if (pack->RowLength == 0) {
1632 pack->RowLength = *width;
1633 }
1634
1635 /* left clipping */
1636 if (*srcX < 0) {
1637 pack->SkipPixels += (0 - *srcX);
1638 *width -= (0 - *srcX);
1639 *srcX = 0;
1640 }
1641 /* right clipping */
1642 if (*srcX + *width > (GLsizei) buffer->Width)
1643 *width -= (*srcX + *width - buffer->Width);
1644
1645 if (*width <= 0)
1646 return GL_FALSE;
1647
1648 /* bottom clipping */
1649 if (*srcY < 0) {
1650 pack->SkipRows += (0 - *srcY);
1651 *height -= (0 - *srcY);
1652 *srcY = 0;
1653 }
1654 /* top clipping */
1655 if (*srcY + *height > (GLsizei) buffer->Height)
1656 *height -= (*srcY + *height - buffer->Height);
1657
1658 if (*height <= 0)
1659 return GL_FALSE;
1660
1661 return GL_TRUE;
1662 }
1663
1664
1665 /**
1666 * Do clipping for a glCopyTexSubImage call.
1667 * The framebuffer source region might extend outside the framebuffer
1668 * bounds. Clip the source region against the framebuffer bounds and
1669 * adjust the texture/dest position and size accordingly.
1670 *
1671 * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
1672 */
1673 GLboolean
1674 _mesa_clip_copytexsubimage(const struct gl_context *ctx,
1675 GLint *destX, GLint *destY,
1676 GLint *srcX, GLint *srcY,
1677 GLsizei *width, GLsizei *height)
1678 {
1679 const struct gl_framebuffer *fb = ctx->ReadBuffer;
1680 const GLint srcX0 = *srcX, srcY0 = *srcY;
1681
1682 if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,
1683 srcX, srcY, width, height)) {
1684 *destX = *destX + *srcX - srcX0;
1685 *destY = *destY + *srcY - srcY0;
1686
1687 return GL_TRUE;
1688 }
1689 else {
1690 return GL_FALSE;
1691 }
1692 }
1693
1694
1695
1696 /**
1697 * Clip the rectangle defined by (x, y, width, height) against the bounds
1698 * specified by [xmin, xmax) and [ymin, ymax).
1699 * \return GL_FALSE if rect is totally clipped, GL_TRUE otherwise.
1700 */
1701 GLboolean
1702 _mesa_clip_to_region(GLint xmin, GLint ymin,
1703 GLint xmax, GLint ymax,
1704 GLint *x, GLint *y,
1705 GLsizei *width, GLsizei *height )
1706 {
1707 /* left clipping */
1708 if (*x < xmin) {
1709 *width -= (xmin - *x);
1710 *x = xmin;
1711 }
1712
1713 /* right clipping */
1714 if (*x + *width > xmax)
1715 *width -= (*x + *width - xmax);
1716
1717 if (*width <= 0)
1718 return GL_FALSE;
1719
1720 /* bottom (or top) clipping */
1721 if (*y < ymin) {
1722 *height -= (ymin - *y);
1723 *y = ymin;
1724 }
1725
1726 /* top (or bottom) clipping */
1727 if (*y + *height > ymax)
1728 *height -= (*y + *height - ymax);
1729
1730 if (*height <= 0)
1731 return GL_FALSE;
1732
1733 return GL_TRUE;
1734 }
1735
1736
1737 /**
1738 * Clip dst coords against Xmax (or Ymax).
1739 */
1740 static inline void
1741 clip_right_or_top(GLint *srcX0, GLint *srcX1,
1742 GLint *dstX0, GLint *dstX1,
1743 GLint maxValue)
1744 {
1745 GLfloat t, bias;
1746
1747 if (*dstX1 > maxValue) {
1748 /* X1 outside right edge */
1749 ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */
1750 t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1751 /* chop off [t, 1] part */
1752 ASSERT(t >= 0.0 && t <= 1.0);
1753 *dstX1 = maxValue;
1754 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1755 *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1756 }
1757 else if (*dstX0 > maxValue) {
1758 /* X0 outside right edge */
1759 ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */
1760 t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1761 /* chop off [t, 1] part */
1762 ASSERT(t >= 0.0 && t <= 1.0);
1763 *dstX0 = maxValue;
1764 bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;
1765 *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1766 }
1767 }
1768
1769
1770 /**
1771 * Clip dst coords against Xmin (or Ymin).
1772 */
1773 static inline void
1774 clip_left_or_bottom(GLint *srcX0, GLint *srcX1,
1775 GLint *dstX0, GLint *dstX1,
1776 GLint minValue)
1777 {
1778 GLfloat t, bias;
1779
1780 if (*dstX0 < minValue) {
1781 /* X0 outside left edge */
1782 ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */
1783 t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1784 /* chop off [0, t] part */
1785 ASSERT(t >= 0.0 && t <= 1.0);
1786 *dstX0 = minValue;
1787 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */
1788 *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1789 }
1790 else if (*dstX1 < minValue) {
1791 /* X1 outside left edge */
1792 ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */
1793 t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1794 /* chop off [0, t] part */
1795 ASSERT(t >= 0.0 && t <= 1.0);
1796 *dstX1 = minValue;
1797 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1798 *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1799 }
1800 }
1801
1802
1803 /**
1804 * Do clipping of blit src/dest rectangles.
1805 * The dest rect is clipped against both the buffer bounds and scissor bounds.
1806 * The src rect is just clipped against the buffer bounds.
1807 *
1808 * When either the src or dest rect is clipped, the other is also clipped
1809 * proportionately!
1810 *
1811 * Note that X0 need not be less than X1 (same for Y) for either the source
1812 * and dest rects. That makes the clipping a little trickier.
1813 *
1814 * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped
1815 */
1816 GLboolean
1817 _mesa_clip_blit(struct gl_context *ctx,
1818 GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1,
1819 GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1)
1820 {
1821 const GLint srcXmin = 0;
1822 const GLint srcXmax = ctx->ReadBuffer->Width;
1823 const GLint srcYmin = 0;
1824 const GLint srcYmax = ctx->ReadBuffer->Height;
1825
1826 /* these include scissor bounds */
1827 const GLint dstXmin = ctx->DrawBuffer->_Xmin;
1828 const GLint dstXmax = ctx->DrawBuffer->_Xmax;
1829 const GLint dstYmin = ctx->DrawBuffer->_Ymin;
1830 const GLint dstYmax = ctx->DrawBuffer->_Ymax;
1831
1832 /*
1833 printf("PreClipX: src: %d .. %d dst: %d .. %d\n",
1834 *srcX0, *srcX1, *dstX0, *dstX1);
1835 printf("PreClipY: src: %d .. %d dst: %d .. %d\n",
1836 *srcY0, *srcY1, *dstY0, *dstY1);
1837 */
1838
1839 /* trivial rejection tests */
1840 if (*dstX0 == *dstX1)
1841 return GL_FALSE; /* no width */
1842 if (*dstX0 <= dstXmin && *dstX1 <= dstXmin)
1843 return GL_FALSE; /* totally out (left) of bounds */
1844 if (*dstX0 >= dstXmax && *dstX1 >= dstXmax)
1845 return GL_FALSE; /* totally out (right) of bounds */
1846
1847 if (*dstY0 == *dstY1)
1848 return GL_FALSE;
1849 if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)
1850 return GL_FALSE;
1851 if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)
1852 return GL_FALSE;
1853
1854 if (*srcX0 == *srcX1)
1855 return GL_FALSE;
1856 if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)
1857 return GL_FALSE;
1858 if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)
1859 return GL_FALSE;
1860
1861 if (*srcY0 == *srcY1)
1862 return GL_FALSE;
1863 if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)
1864 return GL_FALSE;
1865 if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)
1866 return GL_FALSE;
1867
1868 /*
1869 * dest clip
1870 */
1871 clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax);
1872 clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax);
1873 clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin);
1874 clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin);
1875
1876 /*
1877 * src clip (just swap src/dst values from above)
1878 */
1879 clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax);
1880 clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax);
1881 clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin);
1882 clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin);
1883
1884 /*
1885 printf("PostClipX: src: %d .. %d dst: %d .. %d\n",
1886 *srcX0, *srcX1, *dstX0, *dstX1);
1887 printf("PostClipY: src: %d .. %d dst: %d .. %d\n",
1888 *srcY0, *srcY1, *dstY0, *dstY1);
1889 */
1890
1891 ASSERT(*dstX0 >= dstXmin);
1892 ASSERT(*dstX0 <= dstXmax);
1893 ASSERT(*dstX1 >= dstXmin);
1894 ASSERT(*dstX1 <= dstXmax);
1895
1896 ASSERT(*dstY0 >= dstYmin);
1897 ASSERT(*dstY0 <= dstYmax);
1898 ASSERT(*dstY1 >= dstYmin);
1899 ASSERT(*dstY1 <= dstYmax);
1900
1901 ASSERT(*srcX0 >= srcXmin);
1902 ASSERT(*srcX0 <= srcXmax);
1903 ASSERT(*srcX1 >= srcXmin);
1904 ASSERT(*srcX1 <= srcXmax);
1905
1906 ASSERT(*srcY0 >= srcYmin);
1907 ASSERT(*srcY0 <= srcYmax);
1908 ASSERT(*srcY1 >= srcYmin);
1909 ASSERT(*srcY1 <= srcYmax);
1910
1911 return GL_TRUE;
1912 }