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