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3491704f8e9cbb9f8fea9db9dee385073ed6dd57
[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 case GL_RG_INTEGER:
242 return 2;
243
244 case GL_RGB:
245 case GL_BGR:
246 case GL_RGB_INTEGER_EXT:
247 case GL_BGR_INTEGER_EXT:
248 return 3;
249
250 case GL_RGBA:
251 case GL_BGRA:
252 case GL_ABGR_EXT:
253 case GL_RGBA_INTEGER_EXT:
254 case GL_BGRA_INTEGER_EXT:
255 return 4;
256
257 default:
258 return -1;
259 }
260 }
261
262
263 /**
264 * Get the bytes per pixel of pixel format type pair.
265 *
266 * \param format pixel format.
267 * \param type pixel type.
268 *
269 * \return bytes per pixel, or -1 if a bad format or type was given.
270 */
271 GLint
272 _mesa_bytes_per_pixel( GLenum format, GLenum type )
273 {
274 GLint comps = _mesa_components_in_format( format );
275 if (comps < 0)
276 return -1;
277
278 switch (type) {
279 case GL_BITMAP:
280 return 0; /* special case */
281 case GL_BYTE:
282 case GL_UNSIGNED_BYTE:
283 return comps * sizeof(GLubyte);
284 case GL_SHORT:
285 case GL_UNSIGNED_SHORT:
286 return comps * sizeof(GLshort);
287 case GL_INT:
288 case GL_UNSIGNED_INT:
289 return comps * sizeof(GLint);
290 case GL_FLOAT:
291 return comps * sizeof(GLfloat);
292 case GL_HALF_FLOAT_ARB:
293 return comps * sizeof(GLhalfARB);
294 case GL_UNSIGNED_BYTE_3_3_2:
295 case GL_UNSIGNED_BYTE_2_3_3_REV:
296 if (format == GL_RGB || format == GL_BGR ||
297 format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
298 return sizeof(GLubyte);
299 else
300 return -1; /* error */
301 case GL_UNSIGNED_SHORT_5_6_5:
302 case GL_UNSIGNED_SHORT_5_6_5_REV:
303 if (format == GL_RGB || format == GL_BGR ||
304 format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
305 return sizeof(GLushort);
306 else
307 return -1; /* error */
308 case GL_UNSIGNED_SHORT_4_4_4_4:
309 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
310 case GL_UNSIGNED_SHORT_5_5_5_1:
311 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
312 if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
313 format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
314 return sizeof(GLushort);
315 else
316 return -1;
317 case GL_UNSIGNED_INT_8_8_8_8:
318 case GL_UNSIGNED_INT_8_8_8_8_REV:
319 case GL_UNSIGNED_INT_10_10_10_2:
320 case GL_UNSIGNED_INT_2_10_10_10_REV:
321 if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
322 format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
323 return sizeof(GLuint);
324 else
325 return -1;
326 case GL_UNSIGNED_SHORT_8_8_MESA:
327 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
328 if (format == GL_YCBCR_MESA)
329 return sizeof(GLushort);
330 else
331 return -1;
332 case GL_UNSIGNED_INT_24_8_EXT:
333 if (format == GL_DEPTH_STENCIL_EXT)
334 return sizeof(GLuint);
335 else
336 return -1;
337 case GL_UNSIGNED_INT_5_9_9_9_REV:
338 if (format == GL_RGB)
339 return sizeof(GLuint);
340 else
341 return -1;
342 case GL_UNSIGNED_INT_10F_11F_11F_REV:
343 if (format == GL_RGB)
344 return sizeof(GLuint);
345 else
346 return -1;
347 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
348 if (format == GL_DEPTH_STENCIL)
349 return 8;
350 else
351 return -1;
352 default:
353 return -1;
354 }
355 }
356
357
358 /**
359 * Test for a legal pixel format and type.
360 *
361 * \param format pixel format.
362 * \param type pixel type.
363 *
364 * \return GL_TRUE if the given pixel format and type are legal, or GL_FALSE
365 * otherwise.
366 */
367 GLboolean
368 _mesa_is_legal_format_and_type(const struct gl_context *ctx,
369 GLenum format, GLenum type)
370 {
371 switch (format) {
372 case GL_COLOR_INDEX:
373 case GL_STENCIL_INDEX:
374 switch (type) {
375 case GL_BITMAP:
376 case GL_BYTE:
377 case GL_UNSIGNED_BYTE:
378 case GL_SHORT:
379 case GL_UNSIGNED_SHORT:
380 case GL_INT:
381 case GL_UNSIGNED_INT:
382 case GL_FLOAT:
383 return GL_TRUE;
384 case GL_HALF_FLOAT_ARB:
385 return ctx->Extensions.ARB_half_float_pixel;
386 default:
387 return GL_FALSE;
388 }
389 case GL_RED:
390 case GL_GREEN:
391 case GL_BLUE:
392 case GL_ALPHA:
393 #if 0 /* not legal! see table 3.6 of the 1.5 spec */
394 case GL_INTENSITY:
395 #endif
396 case GL_LUMINANCE:
397 case GL_LUMINANCE_ALPHA:
398 case GL_DEPTH_COMPONENT:
399 switch (type) {
400 case GL_BYTE:
401 case GL_UNSIGNED_BYTE:
402 case GL_SHORT:
403 case GL_UNSIGNED_SHORT:
404 case GL_INT:
405 case GL_UNSIGNED_INT:
406 case GL_FLOAT:
407 return GL_TRUE;
408 case GL_HALF_FLOAT_ARB:
409 return ctx->Extensions.ARB_half_float_pixel;
410 default:
411 return GL_FALSE;
412 }
413 case GL_RG:
414 if (!ctx->Extensions.ARB_texture_rg)
415 return GL_FALSE;
416
417 switch (type) {
418 case GL_BYTE:
419 case GL_UNSIGNED_BYTE:
420 case GL_SHORT:
421 case GL_UNSIGNED_SHORT:
422 case GL_INT:
423 case GL_UNSIGNED_INT:
424 case GL_FLOAT:
425 return GL_TRUE;
426 case GL_HALF_FLOAT_ARB:
427 return ctx->Extensions.ARB_half_float_pixel;
428 default:
429 return GL_FALSE;
430 }
431 case GL_RGB:
432 switch (type) {
433 case GL_BYTE:
434 case GL_UNSIGNED_BYTE:
435 case GL_SHORT:
436 case GL_UNSIGNED_SHORT:
437 case GL_INT:
438 case GL_UNSIGNED_INT:
439 case GL_FLOAT:
440 case GL_UNSIGNED_BYTE_3_3_2:
441 case GL_UNSIGNED_BYTE_2_3_3_REV:
442 case GL_UNSIGNED_SHORT_5_6_5:
443 case GL_UNSIGNED_SHORT_5_6_5_REV:
444 return GL_TRUE;
445 case GL_HALF_FLOAT_ARB:
446 return ctx->Extensions.ARB_half_float_pixel;
447 case GL_UNSIGNED_INT_5_9_9_9_REV:
448 return ctx->Extensions.EXT_texture_shared_exponent;
449 case GL_UNSIGNED_INT_10F_11F_11F_REV:
450 return ctx->Extensions.EXT_packed_float;
451 default:
452 return GL_FALSE;
453 }
454 case GL_BGR:
455 switch (type) {
456 /* NOTE: no packed types are supported with BGR. That's
457 * intentional, according to the GL spec.
458 */
459 case GL_BYTE:
460 case GL_UNSIGNED_BYTE:
461 case GL_SHORT:
462 case GL_UNSIGNED_SHORT:
463 case GL_INT:
464 case GL_UNSIGNED_INT:
465 case GL_FLOAT:
466 return GL_TRUE;
467 case GL_HALF_FLOAT_ARB:
468 return ctx->Extensions.ARB_half_float_pixel;
469 default:
470 return GL_FALSE;
471 }
472 case GL_RGBA:
473 case GL_BGRA:
474 case GL_ABGR_EXT:
475 switch (type) {
476 case GL_BYTE:
477 case GL_UNSIGNED_BYTE:
478 case GL_SHORT:
479 case GL_UNSIGNED_SHORT:
480 case GL_INT:
481 case GL_UNSIGNED_INT:
482 case GL_FLOAT:
483 case GL_UNSIGNED_SHORT_4_4_4_4:
484 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
485 case GL_UNSIGNED_SHORT_5_5_5_1:
486 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
487 case GL_UNSIGNED_INT_8_8_8_8:
488 case GL_UNSIGNED_INT_8_8_8_8_REV:
489 case GL_UNSIGNED_INT_10_10_10_2:
490 case GL_UNSIGNED_INT_2_10_10_10_REV:
491 return GL_TRUE;
492 case GL_HALF_FLOAT_ARB:
493 return ctx->Extensions.ARB_half_float_pixel;
494 default:
495 return GL_FALSE;
496 }
497 case GL_YCBCR_MESA:
498 if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
499 type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
500 return GL_TRUE;
501 else
502 return GL_FALSE;
503 case GL_DEPTH_STENCIL_EXT:
504 if ((ctx->Extensions.EXT_packed_depth_stencil &&
505 type == GL_UNSIGNED_INT_24_8_EXT) ||
506 (ctx->Extensions.ARB_depth_buffer_float &&
507 type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV))
508 return GL_TRUE;
509 else
510 return GL_FALSE;
511 case GL_DUDV_ATI:
512 case GL_DU8DV8_ATI:
513 switch (type) {
514 case GL_BYTE:
515 case GL_UNSIGNED_BYTE:
516 case GL_SHORT:
517 case GL_UNSIGNED_SHORT:
518 case GL_INT:
519 case GL_UNSIGNED_INT:
520 case GL_FLOAT:
521 return GL_TRUE;
522 default:
523 return GL_FALSE;
524 }
525
526 /* integer-valued formats */
527 case GL_RED_INTEGER_EXT:
528 case GL_GREEN_INTEGER_EXT:
529 case GL_BLUE_INTEGER_EXT:
530 case GL_ALPHA_INTEGER_EXT:
531 case GL_RG_INTEGER:
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->VersionMajor >= 3 ||
540 ctx->Extensions.EXT_texture_integer;
541 default:
542 return GL_FALSE;
543 }
544
545 case GL_RGB_INTEGER_EXT:
546 switch (type) {
547 case GL_BYTE:
548 case GL_UNSIGNED_BYTE:
549 case GL_SHORT:
550 case GL_UNSIGNED_SHORT:
551 case GL_INT:
552 case GL_UNSIGNED_INT:
553 return ctx->VersionMajor >= 3 ||
554 ctx->Extensions.EXT_texture_integer;
555 case GL_UNSIGNED_BYTE_3_3_2:
556 case GL_UNSIGNED_BYTE_2_3_3_REV:
557 case GL_UNSIGNED_SHORT_5_6_5:
558 case GL_UNSIGNED_SHORT_5_6_5_REV:
559 return ctx->Extensions.ARB_texture_rgb10_a2ui;
560 default:
561 return GL_FALSE;
562 }
563
564 case GL_BGR_INTEGER_EXT:
565 switch (type) {
566 case GL_BYTE:
567 case GL_UNSIGNED_BYTE:
568 case GL_SHORT:
569 case GL_UNSIGNED_SHORT:
570 case GL_INT:
571 case GL_UNSIGNED_INT:
572 /* NOTE: no packed formats w/ BGR format */
573 return ctx->VersionMajor >= 3 ||
574 ctx->Extensions.EXT_texture_integer;
575 default:
576 return GL_FALSE;
577 }
578
579 case GL_RGBA_INTEGER_EXT:
580 case GL_BGRA_INTEGER_EXT:
581 switch (type) {
582 case GL_BYTE:
583 case GL_UNSIGNED_BYTE:
584 case GL_SHORT:
585 case GL_UNSIGNED_SHORT:
586 case GL_INT:
587 case GL_UNSIGNED_INT:
588 return ctx->VersionMajor >= 3 ||
589 ctx->Extensions.EXT_texture_integer;
590 case GL_UNSIGNED_SHORT_4_4_4_4:
591 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
592 case GL_UNSIGNED_SHORT_5_5_5_1:
593 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
594 case GL_UNSIGNED_INT_8_8_8_8:
595 case GL_UNSIGNED_INT_8_8_8_8_REV:
596 case GL_UNSIGNED_INT_10_10_10_2:
597 case GL_UNSIGNED_INT_2_10_10_10_REV:
598 return ctx->Extensions.ARB_texture_rgb10_a2ui;
599 default:
600 return GL_FALSE;
601 }
602
603 case GL_LUMINANCE_INTEGER_EXT:
604 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
605 switch (type) {
606 case GL_BYTE:
607 case GL_UNSIGNED_BYTE:
608 case GL_SHORT:
609 case GL_UNSIGNED_SHORT:
610 case GL_INT:
611 case GL_UNSIGNED_INT:
612 return ctx->Extensions.EXT_texture_integer;
613 default:
614 return GL_FALSE;
615 }
616
617 default:
618 ; /* fall-through */
619 }
620 return GL_FALSE;
621 }
622
623
624 /**
625 * Test if the given image format is a color/RGBA format (i.e., not color
626 * index, depth, stencil, etc).
627 * \param format the image format value (may by an internal texture format)
628 * \return GL_TRUE if its a color/RGBA format, GL_FALSE otherwise.
629 */
630 GLboolean
631 _mesa_is_color_format(GLenum format)
632 {
633 switch (format) {
634 case GL_RED:
635 case GL_GREEN:
636 case GL_BLUE:
637 case GL_ALPHA:
638 case GL_ALPHA4:
639 case GL_ALPHA8:
640 case GL_ALPHA12:
641 case GL_ALPHA16:
642 case 1:
643 case GL_LUMINANCE:
644 case GL_LUMINANCE4:
645 case GL_LUMINANCE8:
646 case GL_LUMINANCE12:
647 case GL_LUMINANCE16:
648 case 2:
649 case GL_LUMINANCE_ALPHA:
650 case GL_LUMINANCE4_ALPHA4:
651 case GL_LUMINANCE6_ALPHA2:
652 case GL_LUMINANCE8_ALPHA8:
653 case GL_LUMINANCE12_ALPHA4:
654 case GL_LUMINANCE12_ALPHA12:
655 case GL_LUMINANCE16_ALPHA16:
656 case GL_INTENSITY:
657 case GL_INTENSITY4:
658 case GL_INTENSITY8:
659 case GL_INTENSITY12:
660 case GL_INTENSITY16:
661 case GL_R8:
662 case GL_R16:
663 case GL_RG:
664 case GL_RG8:
665 case GL_RG16:
666 case 3:
667 case GL_RGB:
668 case GL_BGR:
669 case GL_R3_G3_B2:
670 case GL_RGB4:
671 case GL_RGB5:
672 case GL_RGB8:
673 case GL_RGB10:
674 case GL_RGB12:
675 case GL_RGB16:
676 case 4:
677 case GL_ABGR_EXT:
678 case GL_RGBA:
679 case GL_BGRA:
680 case GL_RGBA2:
681 case GL_RGBA4:
682 case GL_RGB5_A1:
683 case GL_RGBA8:
684 case GL_RGB10_A2:
685 case GL_RGBA12:
686 case GL_RGBA16:
687 /* float texture formats */
688 case GL_ALPHA16F_ARB:
689 case GL_ALPHA32F_ARB:
690 case GL_LUMINANCE16F_ARB:
691 case GL_LUMINANCE32F_ARB:
692 case GL_LUMINANCE_ALPHA16F_ARB:
693 case GL_LUMINANCE_ALPHA32F_ARB:
694 case GL_INTENSITY16F_ARB:
695 case GL_INTENSITY32F_ARB:
696 case GL_R16F:
697 case GL_R32F:
698 case GL_RG16F:
699 case GL_RG32F:
700 case GL_RGB16F_ARB:
701 case GL_RGB32F_ARB:
702 case GL_RGBA16F_ARB:
703 case GL_RGBA32F_ARB:
704 /* compressed formats */
705 case GL_COMPRESSED_ALPHA:
706 case GL_COMPRESSED_LUMINANCE:
707 case GL_COMPRESSED_LUMINANCE_ALPHA:
708 case GL_COMPRESSED_INTENSITY:
709 case GL_COMPRESSED_RED:
710 case GL_COMPRESSED_RG:
711 case GL_COMPRESSED_RGB:
712 case GL_COMPRESSED_RGBA:
713 case GL_RGB_S3TC:
714 case GL_RGB4_S3TC:
715 case GL_RGBA_S3TC:
716 case GL_RGBA4_S3TC:
717 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
718 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
719 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
720 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
721 case GL_COMPRESSED_RGB_FXT1_3DFX:
722 case GL_COMPRESSED_RGBA_FXT1_3DFX:
723 #if FEATURE_EXT_texture_sRGB
724 case GL_SRGB_EXT:
725 case GL_SRGB8_EXT:
726 case GL_SRGB_ALPHA_EXT:
727 case GL_SRGB8_ALPHA8_EXT:
728 case GL_SLUMINANCE_ALPHA_EXT:
729 case GL_SLUMINANCE8_ALPHA8_EXT:
730 case GL_SLUMINANCE_EXT:
731 case GL_SLUMINANCE8_EXT:
732 case GL_COMPRESSED_SRGB_EXT:
733 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
734 case GL_COMPRESSED_SRGB_ALPHA_EXT:
735 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
736 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
737 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
738 case GL_COMPRESSED_SLUMINANCE_EXT:
739 case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
740 #endif /* FEATURE_EXT_texture_sRGB */
741 case GL_COMPRESSED_RED_RGTC1:
742 case GL_COMPRESSED_SIGNED_RED_RGTC1:
743 case GL_COMPRESSED_RG_RGTC2:
744 case GL_COMPRESSED_SIGNED_RG_RGTC2:
745 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
746 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
747 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
748 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
749 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
750 case GL_ETC1_RGB8_OES:
751 /* generic integer formats */
752 case GL_RED_INTEGER_EXT:
753 case GL_GREEN_INTEGER_EXT:
754 case GL_BLUE_INTEGER_EXT:
755 case GL_ALPHA_INTEGER_EXT:
756 case GL_RGB_INTEGER_EXT:
757 case GL_RGBA_INTEGER_EXT:
758 case GL_BGR_INTEGER_EXT:
759 case GL_BGRA_INTEGER_EXT:
760 case GL_RG_INTEGER:
761 case GL_LUMINANCE_INTEGER_EXT:
762 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
763 /* sized integer formats */
764 case GL_RGBA32UI_EXT:
765 case GL_RGB32UI_EXT:
766 case GL_RG32UI:
767 case GL_R32UI:
768 case GL_ALPHA32UI_EXT:
769 case GL_INTENSITY32UI_EXT:
770 case GL_LUMINANCE32UI_EXT:
771 case GL_LUMINANCE_ALPHA32UI_EXT:
772 case GL_RGBA16UI_EXT:
773 case GL_RGB16UI_EXT:
774 case GL_RG16UI:
775 case GL_R16UI:
776 case GL_ALPHA16UI_EXT:
777 case GL_INTENSITY16UI_EXT:
778 case GL_LUMINANCE16UI_EXT:
779 case GL_LUMINANCE_ALPHA16UI_EXT:
780 case GL_RGBA8UI_EXT:
781 case GL_RGB8UI_EXT:
782 case GL_RG8UI:
783 case GL_R8UI:
784 case GL_ALPHA8UI_EXT:
785 case GL_INTENSITY8UI_EXT:
786 case GL_LUMINANCE8UI_EXT:
787 case GL_LUMINANCE_ALPHA8UI_EXT:
788 case GL_RGBA32I_EXT:
789 case GL_RGB32I_EXT:
790 case GL_RG32I:
791 case GL_R32I:
792 case GL_ALPHA32I_EXT:
793 case GL_INTENSITY32I_EXT:
794 case GL_LUMINANCE32I_EXT:
795 case GL_LUMINANCE_ALPHA32I_EXT:
796 case GL_RGBA16I_EXT:
797 case GL_RGB16I_EXT:
798 case GL_RG16I:
799 case GL_R16I:
800 case GL_ALPHA16I_EXT:
801 case GL_INTENSITY16I_EXT:
802 case GL_LUMINANCE16I_EXT:
803 case GL_LUMINANCE_ALPHA16I_EXT:
804 case GL_RGBA8I_EXT:
805 case GL_RGB8I_EXT:
806 case GL_RG8I:
807 case GL_R8I:
808 case GL_ALPHA8I_EXT:
809 case GL_INTENSITY8I_EXT:
810 case GL_LUMINANCE8I_EXT:
811 case GL_LUMINANCE_ALPHA8I_EXT:
812 /* signed, normalized texture formats */
813 case GL_RED_SNORM:
814 case GL_R8_SNORM:
815 case GL_R16_SNORM:
816 case GL_RG_SNORM:
817 case GL_RG8_SNORM:
818 case GL_RG16_SNORM:
819 case GL_RGB_SNORM:
820 case GL_RGB8_SNORM:
821 case GL_RGB16_SNORM:
822 case GL_RGBA_SNORM:
823 case GL_RGBA8_SNORM:
824 case GL_RGBA16_SNORM:
825 case GL_ALPHA_SNORM:
826 case GL_ALPHA8_SNORM:
827 case GL_ALPHA16_SNORM:
828 case GL_LUMINANCE_SNORM:
829 case GL_LUMINANCE8_SNORM:
830 case GL_LUMINANCE16_SNORM:
831 case GL_LUMINANCE_ALPHA_SNORM:
832 case GL_LUMINANCE8_ALPHA8_SNORM:
833 case GL_LUMINANCE16_ALPHA16_SNORM:
834 case GL_INTENSITY_SNORM:
835 case GL_INTENSITY8_SNORM:
836 case GL_INTENSITY16_SNORM:
837 case GL_RGB9_E5:
838 case GL_R11F_G11F_B10F:
839 case GL_RGB10_A2UI:
840 return GL_TRUE;
841 case GL_YCBCR_MESA: /* not considered to be RGB */
842 /* fall-through */
843 default:
844 return GL_FALSE;
845 }
846 }
847
848
849 /**
850 * Test if the given image format is a depth component format.
851 */
852 GLboolean
853 _mesa_is_depth_format(GLenum format)
854 {
855 switch (format) {
856 case GL_DEPTH_COMPONENT:
857 case GL_DEPTH_COMPONENT16:
858 case GL_DEPTH_COMPONENT24:
859 case GL_DEPTH_COMPONENT32:
860 case GL_DEPTH_COMPONENT32F:
861 return GL_TRUE;
862 default:
863 return GL_FALSE;
864 }
865 }
866
867
868 /**
869 * Test if the given image format is a stencil format.
870 */
871 GLboolean
872 _mesa_is_stencil_format(GLenum format)
873 {
874 switch (format) {
875 case GL_STENCIL_INDEX:
876 return GL_TRUE;
877 default:
878 return GL_FALSE;
879 }
880 }
881
882
883 /**
884 * Test if the given image format is a YCbCr format.
885 */
886 GLboolean
887 _mesa_is_ycbcr_format(GLenum format)
888 {
889 switch (format) {
890 case GL_YCBCR_MESA:
891 return GL_TRUE;
892 default:
893 return GL_FALSE;
894 }
895 }
896
897
898 /**
899 * Test if the given image format is a depth+stencil format.
900 */
901 GLboolean
902 _mesa_is_depthstencil_format(GLenum format)
903 {
904 switch (format) {
905 case GL_DEPTH24_STENCIL8_EXT:
906 case GL_DEPTH_STENCIL_EXT:
907 case GL_DEPTH32F_STENCIL8:
908 return GL_TRUE;
909 default:
910 return GL_FALSE;
911 }
912 }
913
914
915 /**
916 * Test if the given image format is a depth or stencil format.
917 */
918 GLboolean
919 _mesa_is_depth_or_stencil_format(GLenum format)
920 {
921 switch (format) {
922 case GL_DEPTH_COMPONENT:
923 case GL_DEPTH_COMPONENT16:
924 case GL_DEPTH_COMPONENT24:
925 case GL_DEPTH_COMPONENT32:
926 case GL_STENCIL_INDEX:
927 case GL_STENCIL_INDEX1_EXT:
928 case GL_STENCIL_INDEX4_EXT:
929 case GL_STENCIL_INDEX8_EXT:
930 case GL_STENCIL_INDEX16_EXT:
931 case GL_DEPTH_STENCIL_EXT:
932 case GL_DEPTH24_STENCIL8_EXT:
933 case GL_DEPTH_COMPONENT32F:
934 case GL_DEPTH32F_STENCIL8:
935 return GL_TRUE;
936 default:
937 return GL_FALSE;
938 }
939 }
940
941
942 /**
943 * Test if the given image format is a dudv format.
944 */
945 GLboolean
946 _mesa_is_dudv_format(GLenum format)
947 {
948 switch (format) {
949 case GL_DUDV_ATI:
950 case GL_DU8DV8_ATI:
951 return GL_TRUE;
952 default:
953 return GL_FALSE;
954 }
955 }
956
957
958 /**
959 * Test if the given format is an integer (non-normalized) format.
960 */
961 GLboolean
962 _mesa_is_integer_format(GLenum format)
963 {
964 switch (format) {
965 /* generic integer formats */
966 case GL_RED_INTEGER_EXT:
967 case GL_GREEN_INTEGER_EXT:
968 case GL_BLUE_INTEGER_EXT:
969 case GL_ALPHA_INTEGER_EXT:
970 case GL_RGB_INTEGER_EXT:
971 case GL_RGBA_INTEGER_EXT:
972 case GL_BGR_INTEGER_EXT:
973 case GL_BGRA_INTEGER_EXT:
974 case GL_LUMINANCE_INTEGER_EXT:
975 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
976 case GL_RG_INTEGER:
977 /* specific integer formats */
978 case GL_RGBA32UI_EXT:
979 case GL_RGB32UI_EXT:
980 case GL_RG32UI:
981 case GL_R32UI:
982 case GL_ALPHA32UI_EXT:
983 case GL_INTENSITY32UI_EXT:
984 case GL_LUMINANCE32UI_EXT:
985 case GL_LUMINANCE_ALPHA32UI_EXT:
986 case GL_RGBA16UI_EXT:
987 case GL_RGB16UI_EXT:
988 case GL_RG16UI:
989 case GL_R16UI:
990 case GL_ALPHA16UI_EXT:
991 case GL_INTENSITY16UI_EXT:
992 case GL_LUMINANCE16UI_EXT:
993 case GL_LUMINANCE_ALPHA16UI_EXT:
994 case GL_RGBA8UI_EXT:
995 case GL_RGB8UI_EXT:
996 case GL_RG8UI:
997 case GL_R8UI:
998 case GL_ALPHA8UI_EXT:
999 case GL_INTENSITY8UI_EXT:
1000 case GL_LUMINANCE8UI_EXT:
1001 case GL_LUMINANCE_ALPHA8UI_EXT:
1002 case GL_RGBA32I_EXT:
1003 case GL_RGB32I_EXT:
1004 case GL_RG32I:
1005 case GL_R32I:
1006 case GL_ALPHA32I_EXT:
1007 case GL_INTENSITY32I_EXT:
1008 case GL_LUMINANCE32I_EXT:
1009 case GL_LUMINANCE_ALPHA32I_EXT:
1010 case GL_RGBA16I_EXT:
1011 case GL_RGB16I_EXT:
1012 case GL_RG16I:
1013 case GL_R16I:
1014 case GL_ALPHA16I_EXT:
1015 case GL_INTENSITY16I_EXT:
1016 case GL_LUMINANCE16I_EXT:
1017 case GL_LUMINANCE_ALPHA16I_EXT:
1018 case GL_RGBA8I_EXT:
1019 case GL_RGB8I_EXT:
1020 case GL_RG8I:
1021 case GL_R8I:
1022 case GL_ALPHA8I_EXT:
1023 case GL_INTENSITY8I_EXT:
1024 case GL_LUMINANCE8I_EXT:
1025 case GL_LUMINANCE_ALPHA8I_EXT:
1026 case GL_RGB10_A2UI:
1027 return GL_TRUE;
1028 default:
1029 return GL_FALSE;
1030 }
1031 }
1032
1033
1034 /**
1035 * Test if an image format is a supported compressed format.
1036 * \param format the internal format token provided by the user.
1037 * \return GL_TRUE if compressed, GL_FALSE if uncompressed
1038 */
1039 GLboolean
1040 _mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
1041 {
1042 switch (format) {
1043 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
1044 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
1045 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
1046 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
1047 return ctx->Extensions.EXT_texture_compression_s3tc;
1048 case GL_RGB_S3TC:
1049 case GL_RGB4_S3TC:
1050 case GL_RGBA_S3TC:
1051 case GL_RGBA4_S3TC:
1052 return ctx->Extensions.S3_s3tc;
1053 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
1054 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
1055 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
1056 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
1057 return ctx->Extensions.EXT_texture_sRGB
1058 && ctx->Extensions.EXT_texture_compression_s3tc;
1059 case GL_COMPRESSED_RGB_FXT1_3DFX:
1060 case GL_COMPRESSED_RGBA_FXT1_3DFX:
1061 return ctx->Extensions.TDFX_texture_compression_FXT1;
1062 case GL_COMPRESSED_RED_RGTC1:
1063 case GL_COMPRESSED_SIGNED_RED_RGTC1:
1064 case GL_COMPRESSED_RG_RGTC2:
1065 case GL_COMPRESSED_SIGNED_RG_RGTC2:
1066 return ctx->Extensions.ARB_texture_compression_rgtc;
1067 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
1068 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
1069 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
1070 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
1071 return ctx->Extensions.EXT_texture_compression_latc;
1072 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
1073 return ctx->Extensions.ATI_texture_compression_3dc;
1074 case GL_ETC1_RGB8_OES:
1075 return ctx->Extensions.OES_compressed_ETC1_RGB8_texture;
1076 #if FEATURE_ES
1077 case GL_PALETTE4_RGB8_OES:
1078 case GL_PALETTE4_RGBA8_OES:
1079 case GL_PALETTE4_R5_G6_B5_OES:
1080 case GL_PALETTE4_RGBA4_OES:
1081 case GL_PALETTE4_RGB5_A1_OES:
1082 case GL_PALETTE8_RGB8_OES:
1083 case GL_PALETTE8_RGBA8_OES:
1084 case GL_PALETTE8_R5_G6_B5_OES:
1085 case GL_PALETTE8_RGBA4_OES:
1086 case GL_PALETTE8_RGB5_A1_OES:
1087 return ctx->API == API_OPENGLES;
1088 #endif
1089 default:
1090 return GL_FALSE;
1091 }
1092 }
1093
1094
1095 /**
1096 * Does the given base texture/renderbuffer format have the channel
1097 * named by 'pname'?
1098 */
1099 GLboolean
1100 _mesa_base_format_has_channel(GLenum base_format, GLenum pname)
1101 {
1102 switch (pname) {
1103 case GL_TEXTURE_RED_SIZE:
1104 case GL_TEXTURE_RED_TYPE:
1105 case GL_RENDERBUFFER_RED_SIZE_EXT:
1106 case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
1107 if (base_format == GL_RED ||
1108 base_format == GL_RG ||
1109 base_format == GL_RGB ||
1110 base_format == GL_RGBA) {
1111 return GL_TRUE;
1112 }
1113 return GL_FALSE;
1114 case GL_TEXTURE_GREEN_SIZE:
1115 case GL_TEXTURE_GREEN_TYPE:
1116 case GL_RENDERBUFFER_GREEN_SIZE_EXT:
1117 case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
1118 if (base_format == GL_RG ||
1119 base_format == GL_RGB ||
1120 base_format == GL_RGBA) {
1121 return GL_TRUE;
1122 }
1123 return GL_FALSE;
1124 case GL_TEXTURE_BLUE_SIZE:
1125 case GL_TEXTURE_BLUE_TYPE:
1126 case GL_RENDERBUFFER_BLUE_SIZE_EXT:
1127 case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
1128 if (base_format == GL_RGB ||
1129 base_format == GL_RGBA) {
1130 return GL_TRUE;
1131 }
1132 return GL_FALSE;
1133 case GL_TEXTURE_ALPHA_SIZE:
1134 case GL_TEXTURE_ALPHA_TYPE:
1135 case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
1136 case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
1137 if (base_format == GL_RGBA ||
1138 base_format == GL_ALPHA ||
1139 base_format == GL_LUMINANCE_ALPHA) {
1140 return GL_TRUE;
1141 }
1142 return GL_FALSE;
1143 case GL_TEXTURE_LUMINANCE_SIZE:
1144 case GL_TEXTURE_LUMINANCE_TYPE:
1145 if (base_format == GL_LUMINANCE ||
1146 base_format == GL_LUMINANCE_ALPHA) {
1147 return GL_TRUE;
1148 }
1149 return GL_FALSE;
1150 case GL_TEXTURE_INTENSITY_SIZE:
1151 case GL_TEXTURE_INTENSITY_TYPE:
1152 if (base_format == GL_INTENSITY) {
1153 return GL_TRUE;
1154 }
1155 return GL_FALSE;
1156 case GL_TEXTURE_DEPTH_SIZE:
1157 case GL_TEXTURE_DEPTH_TYPE:
1158 case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
1159 case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
1160 if (base_format == GL_DEPTH_STENCIL ||
1161 base_format == GL_DEPTH_COMPONENT) {
1162 return GL_TRUE;
1163 }
1164 return GL_FALSE;
1165 case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
1166 case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
1167 if (base_format == GL_DEPTH_STENCIL ||
1168 base_format == GL_STENCIL_INDEX) {
1169 return GL_TRUE;
1170 }
1171 return GL_FALSE;
1172 default:
1173 _mesa_warning(NULL, "%s: Unexpected channel token 0x%x\n",
1174 __FUNCTION__, pname);
1175 return GL_FALSE;
1176 }
1177
1178 return GL_FALSE;
1179 }
1180
1181
1182 /**
1183 * Return the byte offset of a specific pixel in an image (1D, 2D or 3D).
1184 *
1185 * Pixel unpacking/packing parameters are observed according to \p packing.
1186 *
1187 * \param dimensions either 1, 2 or 3 to indicate dimensionality of image
1188 * \param packing the pixelstore attributes
1189 * \param width the image width
1190 * \param height the image height
1191 * \param format the pixel format (must be validated beforehand)
1192 * \param type the pixel data type (must be validated beforehand)
1193 * \param img which image in the volume (0 for 1D or 2D images)
1194 * \param row row of pixel in the image (0 for 1D images)
1195 * \param column column of pixel in the image
1196 *
1197 * \return offset of pixel.
1198 *
1199 * \sa gl_pixelstore_attrib.
1200 */
1201 GLintptr
1202 _mesa_image_offset( GLuint dimensions,
1203 const struct gl_pixelstore_attrib *packing,
1204 GLsizei width, GLsizei height,
1205 GLenum format, GLenum type,
1206 GLint img, GLint row, GLint column )
1207 {
1208 GLint alignment; /* 1, 2 or 4 */
1209 GLint pixels_per_row;
1210 GLint rows_per_image;
1211 GLint skiprows;
1212 GLint skippixels;
1213 GLint skipimages; /* for 3-D volume images */
1214 GLintptr offset;
1215
1216 ASSERT(dimensions >= 1 && dimensions <= 3);
1217
1218 alignment = packing->Alignment;
1219 if (packing->RowLength > 0) {
1220 pixels_per_row = packing->RowLength;
1221 }
1222 else {
1223 pixels_per_row = width;
1224 }
1225 if (packing->ImageHeight > 0) {
1226 rows_per_image = packing->ImageHeight;
1227 }
1228 else {
1229 rows_per_image = height;
1230 }
1231
1232 skippixels = packing->SkipPixels;
1233 /* Note: SKIP_ROWS _is_ used for 1D images */
1234 skiprows = packing->SkipRows;
1235 /* Note: SKIP_IMAGES is only used for 3D images */
1236 skipimages = (dimensions == 3) ? packing->SkipImages : 0;
1237
1238 if (type == GL_BITMAP) {
1239 /* BITMAP data */
1240 GLint bytes_per_row;
1241 GLint bytes_per_image;
1242 /* components per pixel for color or stencil index: */
1243 const GLint comp_per_pixel = 1;
1244
1245 /* The pixel type and format should have been error checked earlier */
1246 assert(format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX);
1247
1248 bytes_per_row = alignment
1249 * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
1250
1251 bytes_per_image = bytes_per_row * rows_per_image;
1252
1253 offset = (skipimages + img) * bytes_per_image
1254 + (skiprows + row) * bytes_per_row
1255 + (skippixels + column) / 8;
1256 }
1257 else {
1258 /* Non-BITMAP data */
1259 GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
1260 GLint topOfImage;
1261
1262 bytes_per_pixel = _mesa_bytes_per_pixel( format, type );
1263
1264 /* The pixel type and format should have been error checked earlier */
1265 assert(bytes_per_pixel > 0);
1266
1267 bytes_per_row = pixels_per_row * bytes_per_pixel;
1268 remainder = bytes_per_row % alignment;
1269 if (remainder > 0)
1270 bytes_per_row += (alignment - remainder);
1271
1272 ASSERT(bytes_per_row % alignment == 0);
1273
1274 bytes_per_image = bytes_per_row * rows_per_image;
1275
1276 if (packing->Invert) {
1277 /* set pixel_addr to the last row */
1278 topOfImage = bytes_per_row * (height - 1);
1279 bytes_per_row = -bytes_per_row;
1280 }
1281 else {
1282 topOfImage = 0;
1283 }
1284
1285 /* compute final pixel address */
1286 offset = (skipimages + img) * bytes_per_image
1287 + topOfImage
1288 + (skiprows + row) * bytes_per_row
1289 + (skippixels + column) * bytes_per_pixel;
1290 }
1291
1292 return offset;
1293 }
1294
1295
1296 /**
1297 * Return the address of a specific pixel in an image (1D, 2D or 3D).
1298 *
1299 * Pixel unpacking/packing parameters are observed according to \p packing.
1300 *
1301 * \param dimensions either 1, 2 or 3 to indicate dimensionality of image
1302 * \param packing the pixelstore attributes
1303 * \param image starting address of image data
1304 * \param width the image width
1305 * \param height the image height
1306 * \param format the pixel format (must be validated beforehand)
1307 * \param type the pixel data type (must be validated beforehand)
1308 * \param img which image in the volume (0 for 1D or 2D images)
1309 * \param row row of pixel in the image (0 for 1D images)
1310 * \param column column of pixel in the image
1311 *
1312 * \return address of pixel.
1313 *
1314 * \sa gl_pixelstore_attrib.
1315 */
1316 GLvoid *
1317 _mesa_image_address( GLuint dimensions,
1318 const struct gl_pixelstore_attrib *packing,
1319 const GLvoid *image,
1320 GLsizei width, GLsizei height,
1321 GLenum format, GLenum type,
1322 GLint img, GLint row, GLint column )
1323 {
1324 const GLubyte *addr = (const GLubyte *) image;
1325
1326 addr += _mesa_image_offset(dimensions, packing, width, height,
1327 format, type, img, row, column);
1328
1329 return (GLvoid *) addr;
1330 }
1331
1332
1333 GLvoid *
1334 _mesa_image_address1d( const struct gl_pixelstore_attrib *packing,
1335 const GLvoid *image,
1336 GLsizei width,
1337 GLenum format, GLenum type,
1338 GLint column )
1339 {
1340 return _mesa_image_address(1, packing, image, width, 1,
1341 format, type, 0, 0, column);
1342 }
1343
1344
1345 GLvoid *
1346 _mesa_image_address2d( const struct gl_pixelstore_attrib *packing,
1347 const GLvoid *image,
1348 GLsizei width, GLsizei height,
1349 GLenum format, GLenum type,
1350 GLint row, GLint column )
1351 {
1352 return _mesa_image_address(2, packing, image, width, height,
1353 format, type, 0, row, column);
1354 }
1355
1356
1357 GLvoid *
1358 _mesa_image_address3d( const struct gl_pixelstore_attrib *packing,
1359 const GLvoid *image,
1360 GLsizei width, GLsizei height,
1361 GLenum format, GLenum type,
1362 GLint img, GLint row, GLint column )
1363 {
1364 return _mesa_image_address(3, packing, image, width, height,
1365 format, type, img, row, column);
1366 }
1367
1368
1369
1370 /**
1371 * Compute the stride (in bytes) between image rows.
1372 *
1373 * \param packing the pixelstore attributes
1374 * \param width image width.
1375 * \param format pixel format.
1376 * \param type pixel data type.
1377 *
1378 * \return the stride in bytes for the given parameters, or -1 if error
1379 */
1380 GLint
1381 _mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
1382 GLint width, GLenum format, GLenum type )
1383 {
1384 GLint bytesPerRow, remainder;
1385
1386 ASSERT(packing);
1387
1388 if (type == GL_BITMAP) {
1389 if (packing->RowLength == 0) {
1390 bytesPerRow = (width + 7) / 8;
1391 }
1392 else {
1393 bytesPerRow = (packing->RowLength + 7) / 8;
1394 }
1395 }
1396 else {
1397 /* Non-BITMAP data */
1398 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1399 if (bytesPerPixel <= 0)
1400 return -1; /* error */
1401 if (packing->RowLength == 0) {
1402 bytesPerRow = bytesPerPixel * width;
1403 }
1404 else {
1405 bytesPerRow = bytesPerPixel * packing->RowLength;
1406 }
1407 }
1408
1409 remainder = bytesPerRow % packing->Alignment;
1410 if (remainder > 0) {
1411 bytesPerRow += (packing->Alignment - remainder);
1412 }
1413
1414 if (packing->Invert) {
1415 /* negate the bytes per row (negative row stride) */
1416 bytesPerRow = -bytesPerRow;
1417 }
1418
1419 return bytesPerRow;
1420 }
1421
1422
1423 /*
1424 * Compute the stride between images in a 3D texture (in bytes) for the given
1425 * pixel packing parameters and image width, format and type.
1426 */
1427 GLint
1428 _mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
1429 GLint width, GLint height,
1430 GLenum format, GLenum type )
1431 {
1432 GLint bytesPerRow, bytesPerImage, remainder;
1433
1434 ASSERT(packing);
1435
1436 if (type == GL_BITMAP) {
1437 if (packing->RowLength == 0) {
1438 bytesPerRow = (width + 7) / 8;
1439 }
1440 else {
1441 bytesPerRow = (packing->RowLength + 7) / 8;
1442 }
1443 }
1444 else {
1445 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1446
1447 if (bytesPerPixel <= 0)
1448 return -1; /* error */
1449 if (packing->RowLength == 0) {
1450 bytesPerRow = bytesPerPixel * width;
1451 }
1452 else {
1453 bytesPerRow = bytesPerPixel * packing->RowLength;
1454 }
1455 }
1456
1457 remainder = bytesPerRow % packing->Alignment;
1458 if (remainder > 0)
1459 bytesPerRow += (packing->Alignment - remainder);
1460
1461 if (packing->ImageHeight == 0)
1462 bytesPerImage = bytesPerRow * height;
1463 else
1464 bytesPerImage = bytesPerRow * packing->ImageHeight;
1465
1466 return bytesPerImage;
1467 }
1468
1469
1470
1471 /**
1472 * "Expand" a bitmap from 1-bit per pixel to 8-bits per pixel.
1473 * This is typically used to convert a bitmap into a GLubyte/pixel texture.
1474 * "On" bits will set texels to \p onValue.
1475 * "Off" bits will not modify texels.
1476 * \param width src bitmap width in pixels
1477 * \param height src bitmap height in pixels
1478 * \param unpack bitmap unpacking state
1479 * \param bitmap the src bitmap data
1480 * \param destBuffer start of dest buffer
1481 * \param destStride row stride in dest buffer
1482 * \param onValue if bit is 1, set destBuffer pixel to this value
1483 */
1484 void
1485 _mesa_expand_bitmap(GLsizei width, GLsizei height,
1486 const struct gl_pixelstore_attrib *unpack,
1487 const GLubyte *bitmap,
1488 GLubyte *destBuffer, GLint destStride,
1489 GLubyte onValue)
1490 {
1491 const GLubyte *srcRow = (const GLubyte *)
1492 _mesa_image_address2d(unpack, bitmap, width, height,
1493 GL_COLOR_INDEX, GL_BITMAP, 0, 0);
1494 const GLint srcStride = _mesa_image_row_stride(unpack, width,
1495 GL_COLOR_INDEX, GL_BITMAP);
1496 GLint row, col;
1497
1498 #define SET_PIXEL(COL, ROW) \
1499 destBuffer[(ROW) * destStride + (COL)] = onValue;
1500
1501 for (row = 0; row < height; row++) {
1502 const GLubyte *src = srcRow;
1503
1504 if (unpack->LsbFirst) {
1505 /* Lsb first */
1506 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
1507 for (col = 0; col < width; col++) {
1508
1509 if (*src & mask) {
1510 SET_PIXEL(col, row);
1511 }
1512
1513 if (mask == 128U) {
1514 src++;
1515 mask = 1U;
1516 }
1517 else {
1518 mask = mask << 1;
1519 }
1520 }
1521
1522 /* get ready for next row */
1523 if (mask != 1)
1524 src++;
1525 }
1526 else {
1527 /* Msb first */
1528 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
1529 for (col = 0; col < width; col++) {
1530
1531 if (*src & mask) {
1532 SET_PIXEL(col, row);
1533 }
1534
1535 if (mask == 1U) {
1536 src++;
1537 mask = 128U;
1538 }
1539 else {
1540 mask = mask >> 1;
1541 }
1542 }
1543
1544 /* get ready for next row */
1545 if (mask != 128)
1546 src++;
1547 }
1548
1549 srcRow += srcStride;
1550 } /* row */
1551
1552 #undef SET_PIXEL
1553 }
1554
1555
1556
1557
1558 /**
1559 * Convert an array of RGBA colors from one datatype to another.
1560 * NOTE: src may equal dst. In that case, we use a temporary buffer.
1561 */
1562 void
1563 _mesa_convert_colors(GLenum srcType, const GLvoid *src,
1564 GLenum dstType, GLvoid *dst,
1565 GLuint count, const GLubyte mask[])
1566 {
1567 GLuint *tempBuffer;
1568 const GLboolean useTemp = (src == dst);
1569
1570 tempBuffer = malloc(count * MAX_PIXEL_BYTES);
1571 if (!tempBuffer)
1572 return;
1573
1574 ASSERT(srcType != dstType);
1575
1576 switch (srcType) {
1577 case GL_UNSIGNED_BYTE:
1578 if (dstType == GL_UNSIGNED_SHORT) {
1579 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1580 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1581 GLuint i;
1582 for (i = 0; i < count; i++) {
1583 if (!mask || mask[i]) {
1584 dst2[i][RCOMP] = UBYTE_TO_USHORT(src1[i][RCOMP]);
1585 dst2[i][GCOMP] = UBYTE_TO_USHORT(src1[i][GCOMP]);
1586 dst2[i][BCOMP] = UBYTE_TO_USHORT(src1[i][BCOMP]);
1587 dst2[i][ACOMP] = UBYTE_TO_USHORT(src1[i][ACOMP]);
1588 }
1589 }
1590 if (useTemp)
1591 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1592 }
1593 else {
1594 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1595 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1596 GLuint i;
1597 ASSERT(dstType == GL_FLOAT);
1598 for (i = 0; i < count; i++) {
1599 if (!mask || mask[i]) {
1600 dst4[i][RCOMP] = UBYTE_TO_FLOAT(src1[i][RCOMP]);
1601 dst4[i][GCOMP] = UBYTE_TO_FLOAT(src1[i][GCOMP]);
1602 dst4[i][BCOMP] = UBYTE_TO_FLOAT(src1[i][BCOMP]);
1603 dst4[i][ACOMP] = UBYTE_TO_FLOAT(src1[i][ACOMP]);
1604 }
1605 }
1606 if (useTemp)
1607 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1608 }
1609 break;
1610 case GL_UNSIGNED_SHORT:
1611 if (dstType == GL_UNSIGNED_BYTE) {
1612 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1613 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1614 GLuint i;
1615 for (i = 0; i < count; i++) {
1616 if (!mask || mask[i]) {
1617 dst1[i][RCOMP] = USHORT_TO_UBYTE(src2[i][RCOMP]);
1618 dst1[i][GCOMP] = USHORT_TO_UBYTE(src2[i][GCOMP]);
1619 dst1[i][BCOMP] = USHORT_TO_UBYTE(src2[i][BCOMP]);
1620 dst1[i][ACOMP] = USHORT_TO_UBYTE(src2[i][ACOMP]);
1621 }
1622 }
1623 if (useTemp)
1624 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1625 }
1626 else {
1627 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1628 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1629 GLuint i;
1630 ASSERT(dstType == GL_FLOAT);
1631 for (i = 0; i < count; i++) {
1632 if (!mask || mask[i]) {
1633 dst4[i][RCOMP] = USHORT_TO_FLOAT(src2[i][RCOMP]);
1634 dst4[i][GCOMP] = USHORT_TO_FLOAT(src2[i][GCOMP]);
1635 dst4[i][BCOMP] = USHORT_TO_FLOAT(src2[i][BCOMP]);
1636 dst4[i][ACOMP] = USHORT_TO_FLOAT(src2[i][ACOMP]);
1637 }
1638 }
1639 if (useTemp)
1640 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1641 }
1642 break;
1643 case GL_FLOAT:
1644 if (dstType == GL_UNSIGNED_BYTE) {
1645 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1646 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1647 GLuint i;
1648 for (i = 0; i < count; i++) {
1649 if (!mask || mask[i])
1650 _mesa_unclamped_float_rgba_to_ubyte(dst1[i], src4[i]);
1651 }
1652 if (useTemp)
1653 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1654 }
1655 else {
1656 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1657 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1658 GLuint i;
1659 ASSERT(dstType == GL_UNSIGNED_SHORT);
1660 for (i = 0; i < count; i++) {
1661 if (!mask || mask[i]) {
1662 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][RCOMP], src4[i][RCOMP]);
1663 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][GCOMP], src4[i][GCOMP]);
1664 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][BCOMP], src4[i][BCOMP]);
1665 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][ACOMP], src4[i][ACOMP]);
1666 }
1667 }
1668 if (useTemp)
1669 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1670 }
1671 break;
1672 default:
1673 _mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");
1674 }
1675
1676 free(tempBuffer);
1677 }
1678
1679
1680
1681
1682 /**
1683 * Perform basic clipping for glDrawPixels. The image's position and size
1684 * and the unpack SkipPixels and SkipRows are adjusted so that the image
1685 * region is entirely within the window and scissor bounds.
1686 * NOTE: this will only work when glPixelZoom is (1, 1) or (1, -1).
1687 * If Pixel.ZoomY is -1, *destY will be changed to be the first row which
1688 * we'll actually write. Beforehand, *destY-1 is the first drawing row.
1689 *
1690 * \return GL_TRUE if image is ready for drawing or
1691 * GL_FALSE if image was completely clipped away (draw nothing)
1692 */
1693 GLboolean
1694 _mesa_clip_drawpixels(const struct gl_context *ctx,
1695 GLint *destX, GLint *destY,
1696 GLsizei *width, GLsizei *height,
1697 struct gl_pixelstore_attrib *unpack)
1698 {
1699 const struct gl_framebuffer *buffer = ctx->DrawBuffer;
1700
1701 if (unpack->RowLength == 0) {
1702 unpack->RowLength = *width;
1703 }
1704
1705 ASSERT(ctx->Pixel.ZoomX == 1.0F);
1706 ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);
1707
1708 /* left clipping */
1709 if (*destX < buffer->_Xmin) {
1710 unpack->SkipPixels += (buffer->_Xmin - *destX);
1711 *width -= (buffer->_Xmin - *destX);
1712 *destX = buffer->_Xmin;
1713 }
1714 /* right clipping */
1715 if (*destX + *width > buffer->_Xmax)
1716 *width -= (*destX + *width - buffer->_Xmax);
1717
1718 if (*width <= 0)
1719 return GL_FALSE;
1720
1721 if (ctx->Pixel.ZoomY == 1.0F) {
1722 /* bottom clipping */
1723 if (*destY < buffer->_Ymin) {
1724 unpack->SkipRows += (buffer->_Ymin - *destY);
1725 *height -= (buffer->_Ymin - *destY);
1726 *destY = buffer->_Ymin;
1727 }
1728 /* top clipping */
1729 if (*destY + *height > buffer->_Ymax)
1730 *height -= (*destY + *height - buffer->_Ymax);
1731 }
1732 else { /* upside down */
1733 /* top clipping */
1734 if (*destY > buffer->_Ymax) {
1735 unpack->SkipRows += (*destY - buffer->_Ymax);
1736 *height -= (*destY - buffer->_Ymax);
1737 *destY = buffer->_Ymax;
1738 }
1739 /* bottom clipping */
1740 if (*destY - *height < buffer->_Ymin)
1741 *height -= (buffer->_Ymin - (*destY - *height));
1742 /* adjust destY so it's the first row to write to */
1743 (*destY)--;
1744 }
1745
1746 if (*height <= 0)
1747 return GL_FALSE;
1748
1749 return GL_TRUE;
1750 }
1751
1752
1753 /**
1754 * Perform clipping for glReadPixels. The image's window position
1755 * and size, and the pack skipPixels, skipRows and rowLength are adjusted
1756 * so that the image region is entirely within the window bounds.
1757 * Note: this is different from _mesa_clip_drawpixels() in that the
1758 * scissor box is ignored, and we use the bounds of the current readbuffer
1759 * surface.
1760 *
1761 * \return GL_TRUE if region to read is in bounds
1762 * GL_FALSE if region is completely out of bounds (nothing to read)
1763 */
1764 GLboolean
1765 _mesa_clip_readpixels(const struct gl_context *ctx,
1766 GLint *srcX, GLint *srcY,
1767 GLsizei *width, GLsizei *height,
1768 struct gl_pixelstore_attrib *pack)
1769 {
1770 const struct gl_framebuffer *buffer = ctx->ReadBuffer;
1771
1772 if (pack->RowLength == 0) {
1773 pack->RowLength = *width;
1774 }
1775
1776 /* left clipping */
1777 if (*srcX < 0) {
1778 pack->SkipPixels += (0 - *srcX);
1779 *width -= (0 - *srcX);
1780 *srcX = 0;
1781 }
1782 /* right clipping */
1783 if (*srcX + *width > (GLsizei) buffer->Width)
1784 *width -= (*srcX + *width - buffer->Width);
1785
1786 if (*width <= 0)
1787 return GL_FALSE;
1788
1789 /* bottom clipping */
1790 if (*srcY < 0) {
1791 pack->SkipRows += (0 - *srcY);
1792 *height -= (0 - *srcY);
1793 *srcY = 0;
1794 }
1795 /* top clipping */
1796 if (*srcY + *height > (GLsizei) buffer->Height)
1797 *height -= (*srcY + *height - buffer->Height);
1798
1799 if (*height <= 0)
1800 return GL_FALSE;
1801
1802 return GL_TRUE;
1803 }
1804
1805
1806 /**
1807 * Do clipping for a glCopyTexSubImage call.
1808 * The framebuffer source region might extend outside the framebuffer
1809 * bounds. Clip the source region against the framebuffer bounds and
1810 * adjust the texture/dest position and size accordingly.
1811 *
1812 * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
1813 */
1814 GLboolean
1815 _mesa_clip_copytexsubimage(const struct gl_context *ctx,
1816 GLint *destX, GLint *destY,
1817 GLint *srcX, GLint *srcY,
1818 GLsizei *width, GLsizei *height)
1819 {
1820 const struct gl_framebuffer *fb = ctx->ReadBuffer;
1821 const GLint srcX0 = *srcX, srcY0 = *srcY;
1822
1823 if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,
1824 srcX, srcY, width, height)) {
1825 *destX = *destX + *srcX - srcX0;
1826 *destY = *destY + *srcY - srcY0;
1827
1828 return GL_TRUE;
1829 }
1830 else {
1831 return GL_FALSE;
1832 }
1833 }
1834
1835
1836
1837 /**
1838 * Clip the rectangle defined by (x, y, width, height) against the bounds
1839 * specified by [xmin, xmax) and [ymin, ymax).
1840 * \return GL_FALSE if rect is totally clipped, GL_TRUE otherwise.
1841 */
1842 GLboolean
1843 _mesa_clip_to_region(GLint xmin, GLint ymin,
1844 GLint xmax, GLint ymax,
1845 GLint *x, GLint *y,
1846 GLsizei *width, GLsizei *height )
1847 {
1848 /* left clipping */
1849 if (*x < xmin) {
1850 *width -= (xmin - *x);
1851 *x = xmin;
1852 }
1853
1854 /* right clipping */
1855 if (*x + *width > xmax)
1856 *width -= (*x + *width - xmax);
1857
1858 if (*width <= 0)
1859 return GL_FALSE;
1860
1861 /* bottom (or top) clipping */
1862 if (*y < ymin) {
1863 *height -= (ymin - *y);
1864 *y = ymin;
1865 }
1866
1867 /* top (or bottom) clipping */
1868 if (*y + *height > ymax)
1869 *height -= (*y + *height - ymax);
1870
1871 if (*height <= 0)
1872 return GL_FALSE;
1873
1874 return GL_TRUE;
1875 }
1876
1877
1878 /**
1879 * Clip dst coords against Xmax (or Ymax).
1880 */
1881 static inline void
1882 clip_right_or_top(GLint *srcX0, GLint *srcX1,
1883 GLint *dstX0, GLint *dstX1,
1884 GLint maxValue)
1885 {
1886 GLfloat t, bias;
1887
1888 if (*dstX1 > maxValue) {
1889 /* X1 outside right edge */
1890 ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */
1891 t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1892 /* chop off [t, 1] part */
1893 ASSERT(t >= 0.0 && t <= 1.0);
1894 *dstX1 = maxValue;
1895 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1896 *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1897 }
1898 else if (*dstX0 > maxValue) {
1899 /* X0 outside right edge */
1900 ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */
1901 t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1902 /* chop off [t, 1] part */
1903 ASSERT(t >= 0.0 && t <= 1.0);
1904 *dstX0 = maxValue;
1905 bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;
1906 *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1907 }
1908 }
1909
1910
1911 /**
1912 * Clip dst coords against Xmin (or Ymin).
1913 */
1914 static inline void
1915 clip_left_or_bottom(GLint *srcX0, GLint *srcX1,
1916 GLint *dstX0, GLint *dstX1,
1917 GLint minValue)
1918 {
1919 GLfloat t, bias;
1920
1921 if (*dstX0 < minValue) {
1922 /* X0 outside left edge */
1923 ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */
1924 t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1925 /* chop off [0, t] part */
1926 ASSERT(t >= 0.0 && t <= 1.0);
1927 *dstX0 = minValue;
1928 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */
1929 *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1930 }
1931 else if (*dstX1 < minValue) {
1932 /* X1 outside left edge */
1933 ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */
1934 t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1935 /* chop off [0, t] part */
1936 ASSERT(t >= 0.0 && t <= 1.0);
1937 *dstX1 = minValue;
1938 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1939 *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1940 }
1941 }
1942
1943
1944 /**
1945 * Do clipping of blit src/dest rectangles.
1946 * The dest rect is clipped against both the buffer bounds and scissor bounds.
1947 * The src rect is just clipped against the buffer bounds.
1948 *
1949 * When either the src or dest rect is clipped, the other is also clipped
1950 * proportionately!
1951 *
1952 * Note that X0 need not be less than X1 (same for Y) for either the source
1953 * and dest rects. That makes the clipping a little trickier.
1954 *
1955 * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped
1956 */
1957 GLboolean
1958 _mesa_clip_blit(struct gl_context *ctx,
1959 GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1,
1960 GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1)
1961 {
1962 const GLint srcXmin = 0;
1963 const GLint srcXmax = ctx->ReadBuffer->Width;
1964 const GLint srcYmin = 0;
1965 const GLint srcYmax = ctx->ReadBuffer->Height;
1966
1967 /* these include scissor bounds */
1968 const GLint dstXmin = ctx->DrawBuffer->_Xmin;
1969 const GLint dstXmax = ctx->DrawBuffer->_Xmax;
1970 const GLint dstYmin = ctx->DrawBuffer->_Ymin;
1971 const GLint dstYmax = ctx->DrawBuffer->_Ymax;
1972
1973 /*
1974 printf("PreClipX: src: %d .. %d dst: %d .. %d\n",
1975 *srcX0, *srcX1, *dstX0, *dstX1);
1976 printf("PreClipY: src: %d .. %d dst: %d .. %d\n",
1977 *srcY0, *srcY1, *dstY0, *dstY1);
1978 */
1979
1980 /* trivial rejection tests */
1981 if (*dstX0 == *dstX1)
1982 return GL_FALSE; /* no width */
1983 if (*dstX0 <= dstXmin && *dstX1 <= dstXmin)
1984 return GL_FALSE; /* totally out (left) of bounds */
1985 if (*dstX0 >= dstXmax && *dstX1 >= dstXmax)
1986 return GL_FALSE; /* totally out (right) of bounds */
1987
1988 if (*dstY0 == *dstY1)
1989 return GL_FALSE;
1990 if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)
1991 return GL_FALSE;
1992 if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)
1993 return GL_FALSE;
1994
1995 if (*srcX0 == *srcX1)
1996 return GL_FALSE;
1997 if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)
1998 return GL_FALSE;
1999 if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)
2000 return GL_FALSE;
2001
2002 if (*srcY0 == *srcY1)
2003 return GL_FALSE;
2004 if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)
2005 return GL_FALSE;
2006 if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)
2007 return GL_FALSE;
2008
2009 /*
2010 * dest clip
2011 */
2012 clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax);
2013 clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax);
2014 clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin);
2015 clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin);
2016
2017 /*
2018 * src clip (just swap src/dst values from above)
2019 */
2020 clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax);
2021 clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax);
2022 clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin);
2023 clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin);
2024
2025 /*
2026 printf("PostClipX: src: %d .. %d dst: %d .. %d\n",
2027 *srcX0, *srcX1, *dstX0, *dstX1);
2028 printf("PostClipY: src: %d .. %d dst: %d .. %d\n",
2029 *srcY0, *srcY1, *dstY0, *dstY1);
2030 */
2031
2032 ASSERT(*dstX0 >= dstXmin);
2033 ASSERT(*dstX0 <= dstXmax);
2034 ASSERT(*dstX1 >= dstXmin);
2035 ASSERT(*dstX1 <= dstXmax);
2036
2037 ASSERT(*dstY0 >= dstYmin);
2038 ASSERT(*dstY0 <= dstYmax);
2039 ASSERT(*dstY1 >= dstYmin);
2040 ASSERT(*dstY1 <= dstYmax);
2041
2042 ASSERT(*srcX0 >= srcXmin);
2043 ASSERT(*srcX0 <= srcXmax);
2044 ASSERT(*srcX1 >= srcXmin);
2045 ASSERT(*srcX1 <= srcXmax);
2046
2047 ASSERT(*srcY0 >= srcYmin);
2048 ASSERT(*srcY0 <= srcYmax);
2049 ASSERT(*srcY1 >= srcYmin);
2050 ASSERT(*srcY1 <= srcYmax);
2051
2052 return GL_TRUE;
2053 }