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mesa: Add missing integer R/RG cases to _mesa_is_color_format().
[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_RG32UI:
763 case GL_R32UI:
764 case GL_ALPHA32UI_EXT:
765 case GL_INTENSITY32UI_EXT:
766 case GL_LUMINANCE32UI_EXT:
767 case GL_LUMINANCE_ALPHA32UI_EXT:
768 case GL_RGBA16UI_EXT:
769 case GL_RGB16UI_EXT:
770 case GL_RG16UI:
771 case GL_R16UI:
772 case GL_ALPHA16UI_EXT:
773 case GL_INTENSITY16UI_EXT:
774 case GL_LUMINANCE16UI_EXT:
775 case GL_LUMINANCE_ALPHA16UI_EXT:
776 case GL_RGBA8UI_EXT:
777 case GL_RGB8UI_EXT:
778 case GL_RG8UI:
779 case GL_R8UI:
780 case GL_ALPHA8UI_EXT:
781 case GL_INTENSITY8UI_EXT:
782 case GL_LUMINANCE8UI_EXT:
783 case GL_LUMINANCE_ALPHA8UI_EXT:
784 case GL_RGBA32I_EXT:
785 case GL_RGB32I_EXT:
786 case GL_RG32I:
787 case GL_R32I:
788 case GL_ALPHA32I_EXT:
789 case GL_INTENSITY32I_EXT:
790 case GL_LUMINANCE32I_EXT:
791 case GL_LUMINANCE_ALPHA32I_EXT:
792 case GL_RGBA16I_EXT:
793 case GL_RGB16I_EXT:
794 case GL_RG16I:
795 case GL_R16I:
796 case GL_ALPHA16I_EXT:
797 case GL_INTENSITY16I_EXT:
798 case GL_LUMINANCE16I_EXT:
799 case GL_LUMINANCE_ALPHA16I_EXT:
800 case GL_RGBA8I_EXT:
801 case GL_RGB8I_EXT:
802 case GL_RG8I:
803 case GL_R8I:
804 case GL_ALPHA8I_EXT:
805 case GL_INTENSITY8I_EXT:
806 case GL_LUMINANCE8I_EXT:
807 case GL_LUMINANCE_ALPHA8I_EXT:
808 /* signed, normalized texture formats */
809 case GL_RED_SNORM:
810 case GL_R8_SNORM:
811 case GL_R16_SNORM:
812 case GL_RG_SNORM:
813 case GL_RG8_SNORM:
814 case GL_RG16_SNORM:
815 case GL_RGB_SNORM:
816 case GL_RGB8_SNORM:
817 case GL_RGB16_SNORM:
818 case GL_RGBA_SNORM:
819 case GL_RGBA8_SNORM:
820 case GL_RGBA16_SNORM:
821 case GL_ALPHA_SNORM:
822 case GL_ALPHA8_SNORM:
823 case GL_ALPHA16_SNORM:
824 case GL_LUMINANCE_SNORM:
825 case GL_LUMINANCE8_SNORM:
826 case GL_LUMINANCE16_SNORM:
827 case GL_LUMINANCE_ALPHA_SNORM:
828 case GL_LUMINANCE8_ALPHA8_SNORM:
829 case GL_LUMINANCE16_ALPHA16_SNORM:
830 case GL_INTENSITY_SNORM:
831 case GL_INTENSITY8_SNORM:
832 case GL_INTENSITY16_SNORM:
833 case GL_RGB9_E5:
834 case GL_R11F_G11F_B10F:
835 case GL_RGB10_A2UI:
836 return GL_TRUE;
837 case GL_YCBCR_MESA: /* not considered to be RGB */
838 /* fall-through */
839 default:
840 return GL_FALSE;
841 }
842 }
843
844
845 /**
846 * Test if the given image format is a depth component format.
847 */
848 GLboolean
849 _mesa_is_depth_format(GLenum format)
850 {
851 switch (format) {
852 case GL_DEPTH_COMPONENT:
853 case GL_DEPTH_COMPONENT16:
854 case GL_DEPTH_COMPONENT24:
855 case GL_DEPTH_COMPONENT32:
856 case GL_DEPTH_COMPONENT32F:
857 return GL_TRUE;
858 default:
859 return GL_FALSE;
860 }
861 }
862
863
864 /**
865 * Test if the given image format is a stencil format.
866 */
867 GLboolean
868 _mesa_is_stencil_format(GLenum format)
869 {
870 switch (format) {
871 case GL_STENCIL_INDEX:
872 return GL_TRUE;
873 default:
874 return GL_FALSE;
875 }
876 }
877
878
879 /**
880 * Test if the given image format is a YCbCr format.
881 */
882 GLboolean
883 _mesa_is_ycbcr_format(GLenum format)
884 {
885 switch (format) {
886 case GL_YCBCR_MESA:
887 return GL_TRUE;
888 default:
889 return GL_FALSE;
890 }
891 }
892
893
894 /**
895 * Test if the given image format is a depth+stencil format.
896 */
897 GLboolean
898 _mesa_is_depthstencil_format(GLenum format)
899 {
900 switch (format) {
901 case GL_DEPTH24_STENCIL8_EXT:
902 case GL_DEPTH_STENCIL_EXT:
903 case GL_DEPTH32F_STENCIL8:
904 return GL_TRUE;
905 default:
906 return GL_FALSE;
907 }
908 }
909
910
911 /**
912 * Test if the given image format is a depth or stencil format.
913 */
914 GLboolean
915 _mesa_is_depth_or_stencil_format(GLenum format)
916 {
917 switch (format) {
918 case GL_DEPTH_COMPONENT:
919 case GL_DEPTH_COMPONENT16:
920 case GL_DEPTH_COMPONENT24:
921 case GL_DEPTH_COMPONENT32:
922 case GL_STENCIL_INDEX:
923 case GL_STENCIL_INDEX1_EXT:
924 case GL_STENCIL_INDEX4_EXT:
925 case GL_STENCIL_INDEX8_EXT:
926 case GL_STENCIL_INDEX16_EXT:
927 case GL_DEPTH_STENCIL_EXT:
928 case GL_DEPTH24_STENCIL8_EXT:
929 case GL_DEPTH_COMPONENT32F:
930 case GL_DEPTH32F_STENCIL8:
931 return GL_TRUE;
932 default:
933 return GL_FALSE;
934 }
935 }
936
937
938 /**
939 * Test if the given image format is a dudv format.
940 */
941 GLboolean
942 _mesa_is_dudv_format(GLenum format)
943 {
944 switch (format) {
945 case GL_DUDV_ATI:
946 case GL_DU8DV8_ATI:
947 return GL_TRUE;
948 default:
949 return GL_FALSE;
950 }
951 }
952
953
954 /**
955 * Test if the given format is an integer (non-normalized) format.
956 */
957 GLboolean
958 _mesa_is_integer_format(GLenum format)
959 {
960 switch (format) {
961 /* generic integer formats */
962 case GL_RED_INTEGER_EXT:
963 case GL_GREEN_INTEGER_EXT:
964 case GL_BLUE_INTEGER_EXT:
965 case GL_ALPHA_INTEGER_EXT:
966 case GL_RGB_INTEGER_EXT:
967 case GL_RGBA_INTEGER_EXT:
968 case GL_BGR_INTEGER_EXT:
969 case GL_BGRA_INTEGER_EXT:
970 case GL_LUMINANCE_INTEGER_EXT:
971 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
972 case GL_RG_INTEGER:
973 /* specific integer formats */
974 case GL_RGBA32UI_EXT:
975 case GL_RGB32UI_EXT:
976 case GL_RG32UI:
977 case GL_R32UI:
978 case GL_ALPHA32UI_EXT:
979 case GL_INTENSITY32UI_EXT:
980 case GL_LUMINANCE32UI_EXT:
981 case GL_LUMINANCE_ALPHA32UI_EXT:
982 case GL_RGBA16UI_EXT:
983 case GL_RGB16UI_EXT:
984 case GL_RG16UI:
985 case GL_R16UI:
986 case GL_ALPHA16UI_EXT:
987 case GL_INTENSITY16UI_EXT:
988 case GL_LUMINANCE16UI_EXT:
989 case GL_LUMINANCE_ALPHA16UI_EXT:
990 case GL_RGBA8UI_EXT:
991 case GL_RGB8UI_EXT:
992 case GL_RG8UI:
993 case GL_R8UI:
994 case GL_ALPHA8UI_EXT:
995 case GL_INTENSITY8UI_EXT:
996 case GL_LUMINANCE8UI_EXT:
997 case GL_LUMINANCE_ALPHA8UI_EXT:
998 case GL_RGBA32I_EXT:
999 case GL_RGB32I_EXT:
1000 case GL_RG32I:
1001 case GL_R32I:
1002 case GL_ALPHA32I_EXT:
1003 case GL_INTENSITY32I_EXT:
1004 case GL_LUMINANCE32I_EXT:
1005 case GL_LUMINANCE_ALPHA32I_EXT:
1006 case GL_RGBA16I_EXT:
1007 case GL_RGB16I_EXT:
1008 case GL_RG16I:
1009 case GL_R16I:
1010 case GL_ALPHA16I_EXT:
1011 case GL_INTENSITY16I_EXT:
1012 case GL_LUMINANCE16I_EXT:
1013 case GL_LUMINANCE_ALPHA16I_EXT:
1014 case GL_RGBA8I_EXT:
1015 case GL_RGB8I_EXT:
1016 case GL_RG8I:
1017 case GL_R8I:
1018 case GL_ALPHA8I_EXT:
1019 case GL_INTENSITY8I_EXT:
1020 case GL_LUMINANCE8I_EXT:
1021 case GL_LUMINANCE_ALPHA8I_EXT:
1022 case GL_RGB10_A2UI:
1023 return GL_TRUE;
1024 default:
1025 return GL_FALSE;
1026 }
1027 }
1028
1029
1030 /**
1031 * Test if an image format is a supported compressed format.
1032 * \param format the internal format token provided by the user.
1033 * \return GL_TRUE if compressed, GL_FALSE if uncompressed
1034 */
1035 GLboolean
1036 _mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
1037 {
1038 switch (format) {
1039 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
1040 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
1041 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
1042 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
1043 return ctx->Extensions.EXT_texture_compression_s3tc;
1044 case GL_RGB_S3TC:
1045 case GL_RGB4_S3TC:
1046 case GL_RGBA_S3TC:
1047 case GL_RGBA4_S3TC:
1048 return ctx->Extensions.S3_s3tc;
1049 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
1050 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
1051 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
1052 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
1053 return ctx->Extensions.EXT_texture_sRGB
1054 && ctx->Extensions.EXT_texture_compression_s3tc;
1055 case GL_COMPRESSED_RGB_FXT1_3DFX:
1056 case GL_COMPRESSED_RGBA_FXT1_3DFX:
1057 return ctx->Extensions.TDFX_texture_compression_FXT1;
1058 case GL_COMPRESSED_RED_RGTC1:
1059 case GL_COMPRESSED_SIGNED_RED_RGTC1:
1060 case GL_COMPRESSED_RG_RGTC2:
1061 case GL_COMPRESSED_SIGNED_RG_RGTC2:
1062 return ctx->Extensions.ARB_texture_compression_rgtc;
1063 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
1064 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
1065 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
1066 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
1067 return ctx->Extensions.EXT_texture_compression_latc;
1068 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
1069 return ctx->Extensions.ATI_texture_compression_3dc;
1070 case GL_ETC1_RGB8_OES:
1071 return ctx->Extensions.OES_compressed_ETC1_RGB8_texture;
1072 #if FEATURE_ES
1073 case GL_PALETTE4_RGB8_OES:
1074 case GL_PALETTE4_RGBA8_OES:
1075 case GL_PALETTE4_R5_G6_B5_OES:
1076 case GL_PALETTE4_RGBA4_OES:
1077 case GL_PALETTE4_RGB5_A1_OES:
1078 case GL_PALETTE8_RGB8_OES:
1079 case GL_PALETTE8_RGBA8_OES:
1080 case GL_PALETTE8_R5_G6_B5_OES:
1081 case GL_PALETTE8_RGBA4_OES:
1082 case GL_PALETTE8_RGB5_A1_OES:
1083 return ctx->API == API_OPENGLES;
1084 #endif
1085 default:
1086 return GL_FALSE;
1087 }
1088 }
1089
1090
1091 /**
1092 * Does the given base texture/renderbuffer format have the channel
1093 * named by 'pname'?
1094 */
1095 GLboolean
1096 _mesa_base_format_has_channel(GLenum base_format, GLenum pname)
1097 {
1098 switch (pname) {
1099 case GL_TEXTURE_RED_SIZE:
1100 case GL_TEXTURE_RED_TYPE:
1101 case GL_RENDERBUFFER_RED_SIZE_EXT:
1102 case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
1103 if (base_format == GL_RED ||
1104 base_format == GL_RG ||
1105 base_format == GL_RGB ||
1106 base_format == GL_RGBA) {
1107 return GL_TRUE;
1108 }
1109 return GL_FALSE;
1110 case GL_TEXTURE_GREEN_SIZE:
1111 case GL_TEXTURE_GREEN_TYPE:
1112 case GL_RENDERBUFFER_GREEN_SIZE_EXT:
1113 case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
1114 if (base_format == GL_RG ||
1115 base_format == GL_RGB ||
1116 base_format == GL_RGBA) {
1117 return GL_TRUE;
1118 }
1119 return GL_FALSE;
1120 case GL_TEXTURE_BLUE_SIZE:
1121 case GL_TEXTURE_BLUE_TYPE:
1122 case GL_RENDERBUFFER_BLUE_SIZE_EXT:
1123 case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
1124 if (base_format == GL_RGB ||
1125 base_format == GL_RGBA) {
1126 return GL_TRUE;
1127 }
1128 return GL_FALSE;
1129 case GL_TEXTURE_ALPHA_SIZE:
1130 case GL_TEXTURE_ALPHA_TYPE:
1131 case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
1132 case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
1133 if (base_format == GL_RGBA ||
1134 base_format == GL_ALPHA ||
1135 base_format == GL_LUMINANCE_ALPHA) {
1136 return GL_TRUE;
1137 }
1138 return GL_FALSE;
1139 case GL_TEXTURE_LUMINANCE_SIZE:
1140 case GL_TEXTURE_LUMINANCE_TYPE:
1141 if (base_format == GL_LUMINANCE ||
1142 base_format == GL_LUMINANCE_ALPHA) {
1143 return GL_TRUE;
1144 }
1145 return GL_FALSE;
1146 case GL_TEXTURE_INTENSITY_SIZE:
1147 case GL_TEXTURE_INTENSITY_TYPE:
1148 if (base_format == GL_INTENSITY) {
1149 return GL_TRUE;
1150 }
1151 return GL_FALSE;
1152 case GL_TEXTURE_DEPTH_SIZE:
1153 case GL_TEXTURE_DEPTH_TYPE:
1154 case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
1155 case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
1156 if (base_format == GL_DEPTH_STENCIL ||
1157 base_format == GL_DEPTH_COMPONENT) {
1158 return GL_TRUE;
1159 }
1160 return GL_FALSE;
1161 case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
1162 case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
1163 if (base_format == GL_DEPTH_STENCIL ||
1164 base_format == GL_STENCIL_INDEX) {
1165 return GL_TRUE;
1166 }
1167 return GL_FALSE;
1168 default:
1169 _mesa_warning(NULL, "%s: Unexpected channel token 0x%x\n",
1170 __FUNCTION__, pname);
1171 return GL_FALSE;
1172 }
1173
1174 return GL_FALSE;
1175 }
1176
1177
1178 /**
1179 * Return the byte offset of a specific pixel in an image (1D, 2D or 3D).
1180 *
1181 * Pixel unpacking/packing parameters are observed according to \p packing.
1182 *
1183 * \param dimensions either 1, 2 or 3 to indicate dimensionality of image
1184 * \param packing the pixelstore attributes
1185 * \param width the image width
1186 * \param height the image height
1187 * \param format the pixel format (must be validated beforehand)
1188 * \param type the pixel data type (must be validated beforehand)
1189 * \param img which image in the volume (0 for 1D or 2D images)
1190 * \param row row of pixel in the image (0 for 1D images)
1191 * \param column column of pixel in the image
1192 *
1193 * \return offset of pixel.
1194 *
1195 * \sa gl_pixelstore_attrib.
1196 */
1197 GLintptr
1198 _mesa_image_offset( GLuint dimensions,
1199 const struct gl_pixelstore_attrib *packing,
1200 GLsizei width, GLsizei height,
1201 GLenum format, GLenum type,
1202 GLint img, GLint row, GLint column )
1203 {
1204 GLint alignment; /* 1, 2 or 4 */
1205 GLint pixels_per_row;
1206 GLint rows_per_image;
1207 GLint skiprows;
1208 GLint skippixels;
1209 GLint skipimages; /* for 3-D volume images */
1210 GLintptr offset;
1211
1212 ASSERT(dimensions >= 1 && dimensions <= 3);
1213
1214 alignment = packing->Alignment;
1215 if (packing->RowLength > 0) {
1216 pixels_per_row = packing->RowLength;
1217 }
1218 else {
1219 pixels_per_row = width;
1220 }
1221 if (packing->ImageHeight > 0) {
1222 rows_per_image = packing->ImageHeight;
1223 }
1224 else {
1225 rows_per_image = height;
1226 }
1227
1228 skippixels = packing->SkipPixels;
1229 /* Note: SKIP_ROWS _is_ used for 1D images */
1230 skiprows = packing->SkipRows;
1231 /* Note: SKIP_IMAGES is only used for 3D images */
1232 skipimages = (dimensions == 3) ? packing->SkipImages : 0;
1233
1234 if (type == GL_BITMAP) {
1235 /* BITMAP data */
1236 GLint bytes_per_row;
1237 GLint bytes_per_image;
1238 /* components per pixel for color or stencil index: */
1239 const GLint comp_per_pixel = 1;
1240
1241 /* The pixel type and format should have been error checked earlier */
1242 assert(format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX);
1243
1244 bytes_per_row = alignment
1245 * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
1246
1247 bytes_per_image = bytes_per_row * rows_per_image;
1248
1249 offset = (skipimages + img) * bytes_per_image
1250 + (skiprows + row) * bytes_per_row
1251 + (skippixels + column) / 8;
1252 }
1253 else {
1254 /* Non-BITMAP data */
1255 GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
1256 GLint topOfImage;
1257
1258 bytes_per_pixel = _mesa_bytes_per_pixel( format, type );
1259
1260 /* The pixel type and format should have been error checked earlier */
1261 assert(bytes_per_pixel > 0);
1262
1263 bytes_per_row = pixels_per_row * bytes_per_pixel;
1264 remainder = bytes_per_row % alignment;
1265 if (remainder > 0)
1266 bytes_per_row += (alignment - remainder);
1267
1268 ASSERT(bytes_per_row % alignment == 0);
1269
1270 bytes_per_image = bytes_per_row * rows_per_image;
1271
1272 if (packing->Invert) {
1273 /* set pixel_addr to the last row */
1274 topOfImage = bytes_per_row * (height - 1);
1275 bytes_per_row = -bytes_per_row;
1276 }
1277 else {
1278 topOfImage = 0;
1279 }
1280
1281 /* compute final pixel address */
1282 offset = (skipimages + img) * bytes_per_image
1283 + topOfImage
1284 + (skiprows + row) * bytes_per_row
1285 + (skippixels + column) * bytes_per_pixel;
1286 }
1287
1288 return offset;
1289 }
1290
1291
1292 /**
1293 * Return the address of a specific pixel in an image (1D, 2D or 3D).
1294 *
1295 * Pixel unpacking/packing parameters are observed according to \p packing.
1296 *
1297 * \param dimensions either 1, 2 or 3 to indicate dimensionality of image
1298 * \param packing the pixelstore attributes
1299 * \param image starting address of image data
1300 * \param width the image width
1301 * \param height the image height
1302 * \param format the pixel format (must be validated beforehand)
1303 * \param type the pixel data type (must be validated beforehand)
1304 * \param img which image in the volume (0 for 1D or 2D images)
1305 * \param row row of pixel in the image (0 for 1D images)
1306 * \param column column of pixel in the image
1307 *
1308 * \return address of pixel.
1309 *
1310 * \sa gl_pixelstore_attrib.
1311 */
1312 GLvoid *
1313 _mesa_image_address( GLuint dimensions,
1314 const struct gl_pixelstore_attrib *packing,
1315 const GLvoid *image,
1316 GLsizei width, GLsizei height,
1317 GLenum format, GLenum type,
1318 GLint img, GLint row, GLint column )
1319 {
1320 const GLubyte *addr = (const GLubyte *) image;
1321
1322 addr += _mesa_image_offset(dimensions, packing, width, height,
1323 format, type, img, row, column);
1324
1325 return (GLvoid *) addr;
1326 }
1327
1328
1329 GLvoid *
1330 _mesa_image_address1d( const struct gl_pixelstore_attrib *packing,
1331 const GLvoid *image,
1332 GLsizei width,
1333 GLenum format, GLenum type,
1334 GLint column )
1335 {
1336 return _mesa_image_address(1, packing, image, width, 1,
1337 format, type, 0, 0, column);
1338 }
1339
1340
1341 GLvoid *
1342 _mesa_image_address2d( const struct gl_pixelstore_attrib *packing,
1343 const GLvoid *image,
1344 GLsizei width, GLsizei height,
1345 GLenum format, GLenum type,
1346 GLint row, GLint column )
1347 {
1348 return _mesa_image_address(2, packing, image, width, height,
1349 format, type, 0, row, column);
1350 }
1351
1352
1353 GLvoid *
1354 _mesa_image_address3d( const struct gl_pixelstore_attrib *packing,
1355 const GLvoid *image,
1356 GLsizei width, GLsizei height,
1357 GLenum format, GLenum type,
1358 GLint img, GLint row, GLint column )
1359 {
1360 return _mesa_image_address(3, packing, image, width, height,
1361 format, type, img, row, column);
1362 }
1363
1364
1365
1366 /**
1367 * Compute the stride (in bytes) between image rows.
1368 *
1369 * \param packing the pixelstore attributes
1370 * \param width image width.
1371 * \param format pixel format.
1372 * \param type pixel data type.
1373 *
1374 * \return the stride in bytes for the given parameters, or -1 if error
1375 */
1376 GLint
1377 _mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
1378 GLint width, GLenum format, GLenum type )
1379 {
1380 GLint bytesPerRow, remainder;
1381
1382 ASSERT(packing);
1383
1384 if (type == GL_BITMAP) {
1385 if (packing->RowLength == 0) {
1386 bytesPerRow = (width + 7) / 8;
1387 }
1388 else {
1389 bytesPerRow = (packing->RowLength + 7) / 8;
1390 }
1391 }
1392 else {
1393 /* Non-BITMAP data */
1394 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1395 if (bytesPerPixel <= 0)
1396 return -1; /* error */
1397 if (packing->RowLength == 0) {
1398 bytesPerRow = bytesPerPixel * width;
1399 }
1400 else {
1401 bytesPerRow = bytesPerPixel * packing->RowLength;
1402 }
1403 }
1404
1405 remainder = bytesPerRow % packing->Alignment;
1406 if (remainder > 0) {
1407 bytesPerRow += (packing->Alignment - remainder);
1408 }
1409
1410 if (packing->Invert) {
1411 /* negate the bytes per row (negative row stride) */
1412 bytesPerRow = -bytesPerRow;
1413 }
1414
1415 return bytesPerRow;
1416 }
1417
1418
1419 /*
1420 * Compute the stride between images in a 3D texture (in bytes) for the given
1421 * pixel packing parameters and image width, format and type.
1422 */
1423 GLint
1424 _mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
1425 GLint width, GLint height,
1426 GLenum format, GLenum type )
1427 {
1428 GLint bytesPerRow, bytesPerImage, remainder;
1429
1430 ASSERT(packing);
1431
1432 if (type == GL_BITMAP) {
1433 if (packing->RowLength == 0) {
1434 bytesPerRow = (width + 7) / 8;
1435 }
1436 else {
1437 bytesPerRow = (packing->RowLength + 7) / 8;
1438 }
1439 }
1440 else {
1441 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1442
1443 if (bytesPerPixel <= 0)
1444 return -1; /* error */
1445 if (packing->RowLength == 0) {
1446 bytesPerRow = bytesPerPixel * width;
1447 }
1448 else {
1449 bytesPerRow = bytesPerPixel * packing->RowLength;
1450 }
1451 }
1452
1453 remainder = bytesPerRow % packing->Alignment;
1454 if (remainder > 0)
1455 bytesPerRow += (packing->Alignment - remainder);
1456
1457 if (packing->ImageHeight == 0)
1458 bytesPerImage = bytesPerRow * height;
1459 else
1460 bytesPerImage = bytesPerRow * packing->ImageHeight;
1461
1462 return bytesPerImage;
1463 }
1464
1465
1466
1467 /**
1468 * "Expand" a bitmap from 1-bit per pixel to 8-bits per pixel.
1469 * This is typically used to convert a bitmap into a GLubyte/pixel texture.
1470 * "On" bits will set texels to \p onValue.
1471 * "Off" bits will not modify texels.
1472 * \param width src bitmap width in pixels
1473 * \param height src bitmap height in pixels
1474 * \param unpack bitmap unpacking state
1475 * \param bitmap the src bitmap data
1476 * \param destBuffer start of dest buffer
1477 * \param destStride row stride in dest buffer
1478 * \param onValue if bit is 1, set destBuffer pixel to this value
1479 */
1480 void
1481 _mesa_expand_bitmap(GLsizei width, GLsizei height,
1482 const struct gl_pixelstore_attrib *unpack,
1483 const GLubyte *bitmap,
1484 GLubyte *destBuffer, GLint destStride,
1485 GLubyte onValue)
1486 {
1487 const GLubyte *srcRow = (const GLubyte *)
1488 _mesa_image_address2d(unpack, bitmap, width, height,
1489 GL_COLOR_INDEX, GL_BITMAP, 0, 0);
1490 const GLint srcStride = _mesa_image_row_stride(unpack, width,
1491 GL_COLOR_INDEX, GL_BITMAP);
1492 GLint row, col;
1493
1494 #define SET_PIXEL(COL, ROW) \
1495 destBuffer[(ROW) * destStride + (COL)] = onValue;
1496
1497 for (row = 0; row < height; row++) {
1498 const GLubyte *src = srcRow;
1499
1500 if (unpack->LsbFirst) {
1501 /* Lsb first */
1502 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
1503 for (col = 0; col < width; col++) {
1504
1505 if (*src & mask) {
1506 SET_PIXEL(col, row);
1507 }
1508
1509 if (mask == 128U) {
1510 src++;
1511 mask = 1U;
1512 }
1513 else {
1514 mask = mask << 1;
1515 }
1516 }
1517
1518 /* get ready for next row */
1519 if (mask != 1)
1520 src++;
1521 }
1522 else {
1523 /* Msb first */
1524 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
1525 for (col = 0; col < width; col++) {
1526
1527 if (*src & mask) {
1528 SET_PIXEL(col, row);
1529 }
1530
1531 if (mask == 1U) {
1532 src++;
1533 mask = 128U;
1534 }
1535 else {
1536 mask = mask >> 1;
1537 }
1538 }
1539
1540 /* get ready for next row */
1541 if (mask != 128)
1542 src++;
1543 }
1544
1545 srcRow += srcStride;
1546 } /* row */
1547
1548 #undef SET_PIXEL
1549 }
1550
1551
1552
1553
1554 /**
1555 * Convert an array of RGBA colors from one datatype to another.
1556 * NOTE: src may equal dst. In that case, we use a temporary buffer.
1557 */
1558 void
1559 _mesa_convert_colors(GLenum srcType, const GLvoid *src,
1560 GLenum dstType, GLvoid *dst,
1561 GLuint count, const GLubyte mask[])
1562 {
1563 GLuint *tempBuffer;
1564 const GLboolean useTemp = (src == dst);
1565
1566 tempBuffer = malloc(count * MAX_PIXEL_BYTES);
1567 if (!tempBuffer)
1568 return;
1569
1570 ASSERT(srcType != dstType);
1571
1572 switch (srcType) {
1573 case GL_UNSIGNED_BYTE:
1574 if (dstType == GL_UNSIGNED_SHORT) {
1575 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1576 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1577 GLuint i;
1578 for (i = 0; i < count; i++) {
1579 if (!mask || mask[i]) {
1580 dst2[i][RCOMP] = UBYTE_TO_USHORT(src1[i][RCOMP]);
1581 dst2[i][GCOMP] = UBYTE_TO_USHORT(src1[i][GCOMP]);
1582 dst2[i][BCOMP] = UBYTE_TO_USHORT(src1[i][BCOMP]);
1583 dst2[i][ACOMP] = UBYTE_TO_USHORT(src1[i][ACOMP]);
1584 }
1585 }
1586 if (useTemp)
1587 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1588 }
1589 else {
1590 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1591 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1592 GLuint i;
1593 ASSERT(dstType == GL_FLOAT);
1594 for (i = 0; i < count; i++) {
1595 if (!mask || mask[i]) {
1596 dst4[i][RCOMP] = UBYTE_TO_FLOAT(src1[i][RCOMP]);
1597 dst4[i][GCOMP] = UBYTE_TO_FLOAT(src1[i][GCOMP]);
1598 dst4[i][BCOMP] = UBYTE_TO_FLOAT(src1[i][BCOMP]);
1599 dst4[i][ACOMP] = UBYTE_TO_FLOAT(src1[i][ACOMP]);
1600 }
1601 }
1602 if (useTemp)
1603 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1604 }
1605 break;
1606 case GL_UNSIGNED_SHORT:
1607 if (dstType == GL_UNSIGNED_BYTE) {
1608 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1609 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1610 GLuint i;
1611 for (i = 0; i < count; i++) {
1612 if (!mask || mask[i]) {
1613 dst1[i][RCOMP] = USHORT_TO_UBYTE(src2[i][RCOMP]);
1614 dst1[i][GCOMP] = USHORT_TO_UBYTE(src2[i][GCOMP]);
1615 dst1[i][BCOMP] = USHORT_TO_UBYTE(src2[i][BCOMP]);
1616 dst1[i][ACOMP] = USHORT_TO_UBYTE(src2[i][ACOMP]);
1617 }
1618 }
1619 if (useTemp)
1620 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1621 }
1622 else {
1623 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1624 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1625 GLuint i;
1626 ASSERT(dstType == GL_FLOAT);
1627 for (i = 0; i < count; i++) {
1628 if (!mask || mask[i]) {
1629 dst4[i][RCOMP] = USHORT_TO_FLOAT(src2[i][RCOMP]);
1630 dst4[i][GCOMP] = USHORT_TO_FLOAT(src2[i][GCOMP]);
1631 dst4[i][BCOMP] = USHORT_TO_FLOAT(src2[i][BCOMP]);
1632 dst4[i][ACOMP] = USHORT_TO_FLOAT(src2[i][ACOMP]);
1633 }
1634 }
1635 if (useTemp)
1636 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1637 }
1638 break;
1639 case GL_FLOAT:
1640 if (dstType == GL_UNSIGNED_BYTE) {
1641 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1642 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1643 GLuint i;
1644 for (i = 0; i < count; i++) {
1645 if (!mask || mask[i])
1646 _mesa_unclamped_float_rgba_to_ubyte(dst1[i], src4[i]);
1647 }
1648 if (useTemp)
1649 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1650 }
1651 else {
1652 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1653 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1654 GLuint i;
1655 ASSERT(dstType == GL_UNSIGNED_SHORT);
1656 for (i = 0; i < count; i++) {
1657 if (!mask || mask[i]) {
1658 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][RCOMP], src4[i][RCOMP]);
1659 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][GCOMP], src4[i][GCOMP]);
1660 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][BCOMP], src4[i][BCOMP]);
1661 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][ACOMP], src4[i][ACOMP]);
1662 }
1663 }
1664 if (useTemp)
1665 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1666 }
1667 break;
1668 default:
1669 _mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");
1670 }
1671
1672 free(tempBuffer);
1673 }
1674
1675
1676
1677
1678 /**
1679 * Perform basic clipping for glDrawPixels. The image's position and size
1680 * and the unpack SkipPixels and SkipRows are adjusted so that the image
1681 * region is entirely within the window and scissor bounds.
1682 * NOTE: this will only work when glPixelZoom is (1, 1) or (1, -1).
1683 * If Pixel.ZoomY is -1, *destY will be changed to be the first row which
1684 * we'll actually write. Beforehand, *destY-1 is the first drawing row.
1685 *
1686 * \return GL_TRUE if image is ready for drawing or
1687 * GL_FALSE if image was completely clipped away (draw nothing)
1688 */
1689 GLboolean
1690 _mesa_clip_drawpixels(const struct gl_context *ctx,
1691 GLint *destX, GLint *destY,
1692 GLsizei *width, GLsizei *height,
1693 struct gl_pixelstore_attrib *unpack)
1694 {
1695 const struct gl_framebuffer *buffer = ctx->DrawBuffer;
1696
1697 if (unpack->RowLength == 0) {
1698 unpack->RowLength = *width;
1699 }
1700
1701 ASSERT(ctx->Pixel.ZoomX == 1.0F);
1702 ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);
1703
1704 /* left clipping */
1705 if (*destX < buffer->_Xmin) {
1706 unpack->SkipPixels += (buffer->_Xmin - *destX);
1707 *width -= (buffer->_Xmin - *destX);
1708 *destX = buffer->_Xmin;
1709 }
1710 /* right clipping */
1711 if (*destX + *width > buffer->_Xmax)
1712 *width -= (*destX + *width - buffer->_Xmax);
1713
1714 if (*width <= 0)
1715 return GL_FALSE;
1716
1717 if (ctx->Pixel.ZoomY == 1.0F) {
1718 /* bottom clipping */
1719 if (*destY < buffer->_Ymin) {
1720 unpack->SkipRows += (buffer->_Ymin - *destY);
1721 *height -= (buffer->_Ymin - *destY);
1722 *destY = buffer->_Ymin;
1723 }
1724 /* top clipping */
1725 if (*destY + *height > buffer->_Ymax)
1726 *height -= (*destY + *height - buffer->_Ymax);
1727 }
1728 else { /* upside down */
1729 /* top clipping */
1730 if (*destY > buffer->_Ymax) {
1731 unpack->SkipRows += (*destY - buffer->_Ymax);
1732 *height -= (*destY - buffer->_Ymax);
1733 *destY = buffer->_Ymax;
1734 }
1735 /* bottom clipping */
1736 if (*destY - *height < buffer->_Ymin)
1737 *height -= (buffer->_Ymin - (*destY - *height));
1738 /* adjust destY so it's the first row to write to */
1739 (*destY)--;
1740 }
1741
1742 if (*height <= 0)
1743 return GL_FALSE;
1744
1745 return GL_TRUE;
1746 }
1747
1748
1749 /**
1750 * Perform clipping for glReadPixels. The image's window position
1751 * and size, and the pack skipPixels, skipRows and rowLength are adjusted
1752 * so that the image region is entirely within the window bounds.
1753 * Note: this is different from _mesa_clip_drawpixels() in that the
1754 * scissor box is ignored, and we use the bounds of the current readbuffer
1755 * surface.
1756 *
1757 * \return GL_TRUE if region to read is in bounds
1758 * GL_FALSE if region is completely out of bounds (nothing to read)
1759 */
1760 GLboolean
1761 _mesa_clip_readpixels(const struct gl_context *ctx,
1762 GLint *srcX, GLint *srcY,
1763 GLsizei *width, GLsizei *height,
1764 struct gl_pixelstore_attrib *pack)
1765 {
1766 const struct gl_framebuffer *buffer = ctx->ReadBuffer;
1767
1768 if (pack->RowLength == 0) {
1769 pack->RowLength = *width;
1770 }
1771
1772 /* left clipping */
1773 if (*srcX < 0) {
1774 pack->SkipPixels += (0 - *srcX);
1775 *width -= (0 - *srcX);
1776 *srcX = 0;
1777 }
1778 /* right clipping */
1779 if (*srcX + *width > (GLsizei) buffer->Width)
1780 *width -= (*srcX + *width - buffer->Width);
1781
1782 if (*width <= 0)
1783 return GL_FALSE;
1784
1785 /* bottom clipping */
1786 if (*srcY < 0) {
1787 pack->SkipRows += (0 - *srcY);
1788 *height -= (0 - *srcY);
1789 *srcY = 0;
1790 }
1791 /* top clipping */
1792 if (*srcY + *height > (GLsizei) buffer->Height)
1793 *height -= (*srcY + *height - buffer->Height);
1794
1795 if (*height <= 0)
1796 return GL_FALSE;
1797
1798 return GL_TRUE;
1799 }
1800
1801
1802 /**
1803 * Do clipping for a glCopyTexSubImage call.
1804 * The framebuffer source region might extend outside the framebuffer
1805 * bounds. Clip the source region against the framebuffer bounds and
1806 * adjust the texture/dest position and size accordingly.
1807 *
1808 * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
1809 */
1810 GLboolean
1811 _mesa_clip_copytexsubimage(const struct gl_context *ctx,
1812 GLint *destX, GLint *destY,
1813 GLint *srcX, GLint *srcY,
1814 GLsizei *width, GLsizei *height)
1815 {
1816 const struct gl_framebuffer *fb = ctx->ReadBuffer;
1817 const GLint srcX0 = *srcX, srcY0 = *srcY;
1818
1819 if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,
1820 srcX, srcY, width, height)) {
1821 *destX = *destX + *srcX - srcX0;
1822 *destY = *destY + *srcY - srcY0;
1823
1824 return GL_TRUE;
1825 }
1826 else {
1827 return GL_FALSE;
1828 }
1829 }
1830
1831
1832
1833 /**
1834 * Clip the rectangle defined by (x, y, width, height) against the bounds
1835 * specified by [xmin, xmax) and [ymin, ymax).
1836 * \return GL_FALSE if rect is totally clipped, GL_TRUE otherwise.
1837 */
1838 GLboolean
1839 _mesa_clip_to_region(GLint xmin, GLint ymin,
1840 GLint xmax, GLint ymax,
1841 GLint *x, GLint *y,
1842 GLsizei *width, GLsizei *height )
1843 {
1844 /* left clipping */
1845 if (*x < xmin) {
1846 *width -= (xmin - *x);
1847 *x = xmin;
1848 }
1849
1850 /* right clipping */
1851 if (*x + *width > xmax)
1852 *width -= (*x + *width - xmax);
1853
1854 if (*width <= 0)
1855 return GL_FALSE;
1856
1857 /* bottom (or top) clipping */
1858 if (*y < ymin) {
1859 *height -= (ymin - *y);
1860 *y = ymin;
1861 }
1862
1863 /* top (or bottom) clipping */
1864 if (*y + *height > ymax)
1865 *height -= (*y + *height - ymax);
1866
1867 if (*height <= 0)
1868 return GL_FALSE;
1869
1870 return GL_TRUE;
1871 }
1872
1873
1874 /**
1875 * Clip dst coords against Xmax (or Ymax).
1876 */
1877 static inline void
1878 clip_right_or_top(GLint *srcX0, GLint *srcX1,
1879 GLint *dstX0, GLint *dstX1,
1880 GLint maxValue)
1881 {
1882 GLfloat t, bias;
1883
1884 if (*dstX1 > maxValue) {
1885 /* X1 outside right edge */
1886 ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */
1887 t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1888 /* chop off [t, 1] part */
1889 ASSERT(t >= 0.0 && t <= 1.0);
1890 *dstX1 = maxValue;
1891 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1892 *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1893 }
1894 else if (*dstX0 > maxValue) {
1895 /* X0 outside right edge */
1896 ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */
1897 t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1898 /* chop off [t, 1] part */
1899 ASSERT(t >= 0.0 && t <= 1.0);
1900 *dstX0 = maxValue;
1901 bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;
1902 *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1903 }
1904 }
1905
1906
1907 /**
1908 * Clip dst coords against Xmin (or Ymin).
1909 */
1910 static inline void
1911 clip_left_or_bottom(GLint *srcX0, GLint *srcX1,
1912 GLint *dstX0, GLint *dstX1,
1913 GLint minValue)
1914 {
1915 GLfloat t, bias;
1916
1917 if (*dstX0 < minValue) {
1918 /* X0 outside left edge */
1919 ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */
1920 t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1921 /* chop off [0, t] part */
1922 ASSERT(t >= 0.0 && t <= 1.0);
1923 *dstX0 = minValue;
1924 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */
1925 *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1926 }
1927 else if (*dstX1 < minValue) {
1928 /* X1 outside left edge */
1929 ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */
1930 t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1931 /* chop off [0, t] part */
1932 ASSERT(t >= 0.0 && t <= 1.0);
1933 *dstX1 = minValue;
1934 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1935 *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1936 }
1937 }
1938
1939
1940 /**
1941 * Do clipping of blit src/dest rectangles.
1942 * The dest rect is clipped against both the buffer bounds and scissor bounds.
1943 * The src rect is just clipped against the buffer bounds.
1944 *
1945 * When either the src or dest rect is clipped, the other is also clipped
1946 * proportionately!
1947 *
1948 * Note that X0 need not be less than X1 (same for Y) for either the source
1949 * and dest rects. That makes the clipping a little trickier.
1950 *
1951 * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped
1952 */
1953 GLboolean
1954 _mesa_clip_blit(struct gl_context *ctx,
1955 GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1,
1956 GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1)
1957 {
1958 const GLint srcXmin = 0;
1959 const GLint srcXmax = ctx->ReadBuffer->Width;
1960 const GLint srcYmin = 0;
1961 const GLint srcYmax = ctx->ReadBuffer->Height;
1962
1963 /* these include scissor bounds */
1964 const GLint dstXmin = ctx->DrawBuffer->_Xmin;
1965 const GLint dstXmax = ctx->DrawBuffer->_Xmax;
1966 const GLint dstYmin = ctx->DrawBuffer->_Ymin;
1967 const GLint dstYmax = ctx->DrawBuffer->_Ymax;
1968
1969 /*
1970 printf("PreClipX: src: %d .. %d dst: %d .. %d\n",
1971 *srcX0, *srcX1, *dstX0, *dstX1);
1972 printf("PreClipY: src: %d .. %d dst: %d .. %d\n",
1973 *srcY0, *srcY1, *dstY0, *dstY1);
1974 */
1975
1976 /* trivial rejection tests */
1977 if (*dstX0 == *dstX1)
1978 return GL_FALSE; /* no width */
1979 if (*dstX0 <= dstXmin && *dstX1 <= dstXmin)
1980 return GL_FALSE; /* totally out (left) of bounds */
1981 if (*dstX0 >= dstXmax && *dstX1 >= dstXmax)
1982 return GL_FALSE; /* totally out (right) of bounds */
1983
1984 if (*dstY0 == *dstY1)
1985 return GL_FALSE;
1986 if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)
1987 return GL_FALSE;
1988 if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)
1989 return GL_FALSE;
1990
1991 if (*srcX0 == *srcX1)
1992 return GL_FALSE;
1993 if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)
1994 return GL_FALSE;
1995 if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)
1996 return GL_FALSE;
1997
1998 if (*srcY0 == *srcY1)
1999 return GL_FALSE;
2000 if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)
2001 return GL_FALSE;
2002 if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)
2003 return GL_FALSE;
2004
2005 /*
2006 * dest clip
2007 */
2008 clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax);
2009 clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax);
2010 clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin);
2011 clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin);
2012
2013 /*
2014 * src clip (just swap src/dst values from above)
2015 */
2016 clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax);
2017 clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax);
2018 clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin);
2019 clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin);
2020
2021 /*
2022 printf("PostClipX: src: %d .. %d dst: %d .. %d\n",
2023 *srcX0, *srcX1, *dstX0, *dstX1);
2024 printf("PostClipY: src: %d .. %d dst: %d .. %d\n",
2025 *srcY0, *srcY1, *dstY0, *dstY1);
2026 */
2027
2028 ASSERT(*dstX0 >= dstXmin);
2029 ASSERT(*dstX0 <= dstXmax);
2030 ASSERT(*dstX1 >= dstXmin);
2031 ASSERT(*dstX1 <= dstXmax);
2032
2033 ASSERT(*dstY0 >= dstYmin);
2034 ASSERT(*dstY0 <= dstYmax);
2035 ASSERT(*dstY1 >= dstYmin);
2036 ASSERT(*dstY1 <= dstYmax);
2037
2038 ASSERT(*srcX0 >= srcXmin);
2039 ASSERT(*srcX0 <= srcXmax);
2040 ASSERT(*srcX1 >= srcXmin);
2041 ASSERT(*srcX1 <= srcXmax);
2042
2043 ASSERT(*srcY0 >= srcYmin);
2044 ASSERT(*srcY0 <= srcYmax);
2045 ASSERT(*srcY1 >= srcYmin);
2046 ASSERT(*srcY1 <= srcYmax);
2047
2048 return GL_TRUE;
2049 }