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mesa: move _mesa_base_format_has_channel() into image.c
[mesa.git] / src / mesa / main / image.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.5
4 *
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 /**
28 * \file image.c
29 * Image handling.
30 */
31
32
33 #include "glheader.h"
34 #include "colormac.h"
35 #include "image.h"
36 #include "imports.h"
37 #include "macros.h"
38 #include "mfeatures.h"
39 #include "mtypes.h"
40
41
42
43 /**
44 * \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.
45 */
46 GLboolean
47 _mesa_type_is_packed(GLenum type)
48 {
49 switch (type) {
50 case GL_UNSIGNED_BYTE_3_3_2:
51 case GL_UNSIGNED_BYTE_2_3_3_REV:
52 case MESA_UNSIGNED_BYTE_4_4:
53 case GL_UNSIGNED_SHORT_5_6_5:
54 case GL_UNSIGNED_SHORT_5_6_5_REV:
55 case GL_UNSIGNED_SHORT_4_4_4_4:
56 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
57 case GL_UNSIGNED_SHORT_5_5_5_1:
58 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
59 case GL_UNSIGNED_INT_8_8_8_8:
60 case GL_UNSIGNED_INT_8_8_8_8_REV:
61 case GL_UNSIGNED_INT_10_10_10_2:
62 case GL_UNSIGNED_INT_2_10_10_10_REV:
63 case GL_UNSIGNED_SHORT_8_8_MESA:
64 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
65 case GL_UNSIGNED_INT_24_8_EXT:
66 case GL_UNSIGNED_INT_5_9_9_9_REV:
67 case GL_UNSIGNED_INT_10F_11F_11F_REV:
68 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
69 return GL_TRUE;
70 }
71
72 return GL_FALSE;
73 }
74
75
76
77 /**
78 * Flip the order of the 2 bytes in each word in the given array.
79 *
80 * \param p array.
81 * \param n number of words.
82 */
83 void
84 _mesa_swap2( GLushort *p, GLuint n )
85 {
86 GLuint i;
87 for (i = 0; i < n; i++) {
88 p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
89 }
90 }
91
92
93
94 /*
95 * Flip the order of the 4 bytes in each word in the given array.
96 */
97 void
98 _mesa_swap4( GLuint *p, GLuint n )
99 {
100 GLuint i, a, b;
101 for (i = 0; i < n; i++) {
102 b = p[i];
103 a = (b >> 24)
104 | ((b >> 8) & 0xff00)
105 | ((b << 8) & 0xff0000)
106 | ((b << 24) & 0xff000000);
107 p[i] = a;
108 }
109 }
110
111
112 /**
113 * Get the size of a GL data type.
114 *
115 * \param type GL data type.
116 *
117 * \return the size, in bytes, of the given data type, 0 if a GL_BITMAP, or -1
118 * if an invalid type enum.
119 */
120 GLint
121 _mesa_sizeof_type( GLenum type )
122 {
123 switch (type) {
124 case GL_BITMAP:
125 return 0;
126 case GL_UNSIGNED_BYTE:
127 return sizeof(GLubyte);
128 case GL_BYTE:
129 return sizeof(GLbyte);
130 case GL_UNSIGNED_SHORT:
131 return sizeof(GLushort);
132 case GL_SHORT:
133 return sizeof(GLshort);
134 case GL_UNSIGNED_INT:
135 return sizeof(GLuint);
136 case GL_INT:
137 return sizeof(GLint);
138 case GL_FLOAT:
139 return sizeof(GLfloat);
140 case GL_DOUBLE:
141 return sizeof(GLdouble);
142 case GL_HALF_FLOAT_ARB:
143 return sizeof(GLhalfARB);
144 case GL_FIXED:
145 return sizeof(GLfixed);
146 default:
147 return -1;
148 }
149 }
150
151
152 /**
153 * Same as _mesa_sizeof_type() but also accepting the packed pixel
154 * format data types.
155 */
156 GLint
157 _mesa_sizeof_packed_type( GLenum type )
158 {
159 switch (type) {
160 case GL_BITMAP:
161 return 0;
162 case GL_UNSIGNED_BYTE:
163 return sizeof(GLubyte);
164 case GL_BYTE:
165 return sizeof(GLbyte);
166 case GL_UNSIGNED_SHORT:
167 return sizeof(GLushort);
168 case GL_SHORT:
169 return sizeof(GLshort);
170 case GL_UNSIGNED_INT:
171 return sizeof(GLuint);
172 case GL_INT:
173 return sizeof(GLint);
174 case GL_HALF_FLOAT_ARB:
175 return sizeof(GLhalfARB);
176 case GL_FLOAT:
177 return sizeof(GLfloat);
178 case GL_UNSIGNED_BYTE_3_3_2:
179 case GL_UNSIGNED_BYTE_2_3_3_REV:
180 case MESA_UNSIGNED_BYTE_4_4:
181 return sizeof(GLubyte);
182 case GL_UNSIGNED_SHORT_5_6_5:
183 case GL_UNSIGNED_SHORT_5_6_5_REV:
184 case GL_UNSIGNED_SHORT_4_4_4_4:
185 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
186 case GL_UNSIGNED_SHORT_5_5_5_1:
187 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
188 case GL_UNSIGNED_SHORT_8_8_MESA:
189 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
190 return sizeof(GLushort);
191 case GL_UNSIGNED_INT_8_8_8_8:
192 case GL_UNSIGNED_INT_8_8_8_8_REV:
193 case GL_UNSIGNED_INT_10_10_10_2:
194 case GL_UNSIGNED_INT_2_10_10_10_REV:
195 case GL_UNSIGNED_INT_24_8_EXT:
196 case GL_UNSIGNED_INT_5_9_9_9_REV:
197 case GL_UNSIGNED_INT_10F_11F_11F_REV:
198 return sizeof(GLuint);
199 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
200 return 8;
201 default:
202 return -1;
203 }
204 }
205
206
207 /**
208 * Get the number of components in a pixel format.
209 *
210 * \param format pixel format.
211 *
212 * \return the number of components in the given format, or -1 if a bad format.
213 */
214 GLint
215 _mesa_components_in_format( GLenum format )
216 {
217 switch (format) {
218 case GL_COLOR_INDEX:
219 case GL_STENCIL_INDEX:
220 case GL_DEPTH_COMPONENT:
221 case GL_RED:
222 case GL_RED_INTEGER_EXT:
223 case GL_GREEN:
224 case GL_GREEN_INTEGER_EXT:
225 case GL_BLUE:
226 case GL_BLUE_INTEGER_EXT:
227 case GL_ALPHA:
228 case GL_ALPHA_INTEGER_EXT:
229 case GL_LUMINANCE:
230 case GL_LUMINANCE_INTEGER_EXT:
231 case GL_INTENSITY:
232 return 1;
233
234 case GL_LUMINANCE_ALPHA:
235 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
236 case GL_RG:
237 case GL_YCBCR_MESA:
238 case GL_DEPTH_STENCIL_EXT:
239 case GL_DUDV_ATI:
240 case GL_DU8DV8_ATI:
241 return 2;
242
243 case GL_RGB:
244 case GL_BGR:
245 case GL_RGB_INTEGER_EXT:
246 case GL_BGR_INTEGER_EXT:
247 return 3;
248
249 case GL_RGBA:
250 case GL_BGRA:
251 case GL_ABGR_EXT:
252 case GL_RGBA_INTEGER_EXT:
253 case GL_BGRA_INTEGER_EXT:
254 return 4;
255
256 default:
257 return -1;
258 }
259 }
260
261
262 /**
263 * Get the bytes per pixel of pixel format type pair.
264 *
265 * \param format pixel format.
266 * \param type pixel type.
267 *
268 * \return bytes per pixel, or -1 if a bad format or type was given.
269 */
270 GLint
271 _mesa_bytes_per_pixel( GLenum format, GLenum type )
272 {
273 GLint comps = _mesa_components_in_format( format );
274 if (comps < 0)
275 return -1;
276
277 switch (type) {
278 case GL_BITMAP:
279 return 0; /* special case */
280 case GL_BYTE:
281 case GL_UNSIGNED_BYTE:
282 return comps * sizeof(GLubyte);
283 case GL_SHORT:
284 case GL_UNSIGNED_SHORT:
285 return comps * sizeof(GLshort);
286 case GL_INT:
287 case GL_UNSIGNED_INT:
288 return comps * sizeof(GLint);
289 case GL_FLOAT:
290 return comps * sizeof(GLfloat);
291 case GL_HALF_FLOAT_ARB:
292 return comps * sizeof(GLhalfARB);
293 case GL_UNSIGNED_BYTE_3_3_2:
294 case GL_UNSIGNED_BYTE_2_3_3_REV:
295 if (format == GL_RGB || format == GL_BGR ||
296 format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
297 return sizeof(GLubyte);
298 else
299 return -1; /* error */
300 case GL_UNSIGNED_SHORT_5_6_5:
301 case GL_UNSIGNED_SHORT_5_6_5_REV:
302 if (format == GL_RGB || format == GL_BGR ||
303 format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
304 return sizeof(GLushort);
305 else
306 return -1; /* error */
307 case GL_UNSIGNED_SHORT_4_4_4_4:
308 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
309 case GL_UNSIGNED_SHORT_5_5_5_1:
310 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
311 if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
312 format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
313 return sizeof(GLushort);
314 else
315 return -1;
316 case GL_UNSIGNED_INT_8_8_8_8:
317 case GL_UNSIGNED_INT_8_8_8_8_REV:
318 case GL_UNSIGNED_INT_10_10_10_2:
319 case GL_UNSIGNED_INT_2_10_10_10_REV:
320 if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
321 format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
322 return sizeof(GLuint);
323 else
324 return -1;
325 case GL_UNSIGNED_SHORT_8_8_MESA:
326 case GL_UNSIGNED_SHORT_8_8_REV_MESA:
327 if (format == GL_YCBCR_MESA)
328 return sizeof(GLushort);
329 else
330 return -1;
331 case GL_UNSIGNED_INT_24_8_EXT:
332 if (format == GL_DEPTH_STENCIL_EXT)
333 return sizeof(GLuint);
334 else
335 return -1;
336 case GL_UNSIGNED_INT_5_9_9_9_REV:
337 if (format == GL_RGB)
338 return sizeof(GLuint);
339 else
340 return -1;
341 case GL_UNSIGNED_INT_10F_11F_11F_REV:
342 if (format == GL_RGB)
343 return sizeof(GLuint);
344 else
345 return -1;
346 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
347 if (format == GL_DEPTH_STENCIL)
348 return 8;
349 else
350 return -1;
351 default:
352 return -1;
353 }
354 }
355
356
357 /**
358 * Test for a legal pixel format and type.
359 *
360 * \param format pixel format.
361 * \param type pixel type.
362 *
363 * \return GL_TRUE if the given pixel format and type are legal, or GL_FALSE
364 * otherwise.
365 */
366 GLboolean
367 _mesa_is_legal_format_and_type(const struct gl_context *ctx,
368 GLenum format, GLenum type)
369 {
370 switch (format) {
371 case GL_COLOR_INDEX:
372 case GL_STENCIL_INDEX:
373 switch (type) {
374 case GL_BITMAP:
375 case GL_BYTE:
376 case GL_UNSIGNED_BYTE:
377 case GL_SHORT:
378 case GL_UNSIGNED_SHORT:
379 case GL_INT:
380 case GL_UNSIGNED_INT:
381 case GL_FLOAT:
382 return GL_TRUE;
383 case GL_HALF_FLOAT_ARB:
384 return ctx->Extensions.ARB_half_float_pixel;
385 default:
386 return GL_FALSE;
387 }
388 case GL_RED:
389 case GL_GREEN:
390 case GL_BLUE:
391 case GL_ALPHA:
392 #if 0 /* not legal! see table 3.6 of the 1.5 spec */
393 case GL_INTENSITY:
394 #endif
395 case GL_LUMINANCE:
396 case GL_LUMINANCE_ALPHA:
397 case GL_DEPTH_COMPONENT:
398 switch (type) {
399 case GL_BYTE:
400 case GL_UNSIGNED_BYTE:
401 case GL_SHORT:
402 case GL_UNSIGNED_SHORT:
403 case GL_INT:
404 case GL_UNSIGNED_INT:
405 case GL_FLOAT:
406 return GL_TRUE;
407 case GL_HALF_FLOAT_ARB:
408 return ctx->Extensions.ARB_half_float_pixel;
409 default:
410 return GL_FALSE;
411 }
412 case GL_RG:
413 if (!ctx->Extensions.ARB_texture_rg)
414 return GL_FALSE;
415
416 switch (type) {
417 case GL_BYTE:
418 case GL_UNSIGNED_BYTE:
419 case GL_SHORT:
420 case GL_UNSIGNED_SHORT:
421 case GL_INT:
422 case GL_UNSIGNED_INT:
423 case GL_FLOAT:
424 return GL_TRUE;
425 case GL_HALF_FLOAT_ARB:
426 return ctx->Extensions.ARB_half_float_pixel;
427 default:
428 return GL_FALSE;
429 }
430 case GL_RGB:
431 switch (type) {
432 case GL_BYTE:
433 case GL_UNSIGNED_BYTE:
434 case GL_SHORT:
435 case GL_UNSIGNED_SHORT:
436 case GL_INT:
437 case GL_UNSIGNED_INT:
438 case GL_FLOAT:
439 case GL_UNSIGNED_BYTE_3_3_2:
440 case GL_UNSIGNED_BYTE_2_3_3_REV:
441 case GL_UNSIGNED_SHORT_5_6_5:
442 case GL_UNSIGNED_SHORT_5_6_5_REV:
443 return GL_TRUE;
444 case GL_HALF_FLOAT_ARB:
445 return ctx->Extensions.ARB_half_float_pixel;
446 case GL_UNSIGNED_INT_5_9_9_9_REV:
447 return ctx->Extensions.EXT_texture_shared_exponent;
448 case GL_UNSIGNED_INT_10F_11F_11F_REV:
449 return ctx->Extensions.EXT_packed_float;
450 default:
451 return GL_FALSE;
452 }
453 case GL_BGR:
454 switch (type) {
455 /* NOTE: no packed types are supported with BGR. That's
456 * intentional, according to the GL spec.
457 */
458 case GL_BYTE:
459 case GL_UNSIGNED_BYTE:
460 case GL_SHORT:
461 case GL_UNSIGNED_SHORT:
462 case GL_INT:
463 case GL_UNSIGNED_INT:
464 case GL_FLOAT:
465 return GL_TRUE;
466 case GL_HALF_FLOAT_ARB:
467 return ctx->Extensions.ARB_half_float_pixel;
468 default:
469 return GL_FALSE;
470 }
471 case GL_RGBA:
472 case GL_BGRA:
473 case GL_ABGR_EXT:
474 switch (type) {
475 case GL_BYTE:
476 case GL_UNSIGNED_BYTE:
477 case GL_SHORT:
478 case GL_UNSIGNED_SHORT:
479 case GL_INT:
480 case GL_UNSIGNED_INT:
481 case GL_FLOAT:
482 case GL_UNSIGNED_SHORT_4_4_4_4:
483 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
484 case GL_UNSIGNED_SHORT_5_5_5_1:
485 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
486 case GL_UNSIGNED_INT_8_8_8_8:
487 case GL_UNSIGNED_INT_8_8_8_8_REV:
488 case GL_UNSIGNED_INT_10_10_10_2:
489 case GL_UNSIGNED_INT_2_10_10_10_REV:
490 return GL_TRUE;
491 case GL_HALF_FLOAT_ARB:
492 return ctx->Extensions.ARB_half_float_pixel;
493 default:
494 return GL_FALSE;
495 }
496 case GL_YCBCR_MESA:
497 if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
498 type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
499 return GL_TRUE;
500 else
501 return GL_FALSE;
502 case GL_DEPTH_STENCIL_EXT:
503 if ((ctx->Extensions.EXT_packed_depth_stencil &&
504 type == GL_UNSIGNED_INT_24_8_EXT) ||
505 (ctx->Extensions.ARB_depth_buffer_float &&
506 type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV))
507 return GL_TRUE;
508 else
509 return GL_FALSE;
510 case GL_DUDV_ATI:
511 case GL_DU8DV8_ATI:
512 switch (type) {
513 case GL_BYTE:
514 case GL_UNSIGNED_BYTE:
515 case GL_SHORT:
516 case GL_UNSIGNED_SHORT:
517 case GL_INT:
518 case GL_UNSIGNED_INT:
519 case GL_FLOAT:
520 return GL_TRUE;
521 default:
522 return GL_FALSE;
523 }
524
525 /* integer-valued formats */
526 case GL_RED_INTEGER_EXT:
527 case GL_GREEN_INTEGER_EXT:
528 case GL_BLUE_INTEGER_EXT:
529 case GL_ALPHA_INTEGER_EXT:
530 switch (type) {
531 case GL_BYTE:
532 case GL_UNSIGNED_BYTE:
533 case GL_SHORT:
534 case GL_UNSIGNED_SHORT:
535 case GL_INT:
536 case GL_UNSIGNED_INT:
537 return ctx->Extensions.EXT_texture_integer;
538 default:
539 return GL_FALSE;
540 }
541
542 case GL_RGB_INTEGER_EXT:
543 switch (type) {
544 case GL_BYTE:
545 case GL_UNSIGNED_BYTE:
546 case GL_SHORT:
547 case GL_UNSIGNED_SHORT:
548 case GL_INT:
549 case GL_UNSIGNED_INT:
550 return ctx->Extensions.EXT_texture_integer;
551 case GL_UNSIGNED_BYTE_3_3_2:
552 case GL_UNSIGNED_BYTE_2_3_3_REV:
553 case GL_UNSIGNED_SHORT_5_6_5:
554 case GL_UNSIGNED_SHORT_5_6_5_REV:
555 return ctx->Extensions.ARB_texture_rgb10_a2ui;
556 default:
557 return GL_FALSE;
558 }
559
560 case GL_BGR_INTEGER_EXT:
561 switch (type) {
562 case GL_BYTE:
563 case GL_UNSIGNED_BYTE:
564 case GL_SHORT:
565 case GL_UNSIGNED_SHORT:
566 case GL_INT:
567 case GL_UNSIGNED_INT:
568 /* NOTE: no packed formats w/ BGR format */
569 return ctx->Extensions.EXT_texture_integer;
570 default:
571 return GL_FALSE;
572 }
573
574 case GL_RGBA_INTEGER_EXT:
575 case GL_BGRA_INTEGER_EXT:
576 switch (type) {
577 case GL_BYTE:
578 case GL_UNSIGNED_BYTE:
579 case GL_SHORT:
580 case GL_UNSIGNED_SHORT:
581 case GL_INT:
582 case GL_UNSIGNED_INT:
583 return ctx->Extensions.EXT_texture_integer;
584 case GL_UNSIGNED_SHORT_4_4_4_4:
585 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
586 case GL_UNSIGNED_SHORT_5_5_5_1:
587 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
588 case GL_UNSIGNED_INT_8_8_8_8:
589 case GL_UNSIGNED_INT_8_8_8_8_REV:
590 case GL_UNSIGNED_INT_10_10_10_2:
591 case GL_UNSIGNED_INT_2_10_10_10_REV:
592 return ctx->Extensions.ARB_texture_rgb10_a2ui;
593 default:
594 return GL_FALSE;
595 }
596
597 case GL_LUMINANCE_INTEGER_EXT:
598 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
599 switch (type) {
600 case GL_BYTE:
601 case GL_UNSIGNED_BYTE:
602 case GL_SHORT:
603 case GL_UNSIGNED_SHORT:
604 case GL_INT:
605 case GL_UNSIGNED_INT:
606 return ctx->Extensions.EXT_texture_integer;
607 default:
608 return GL_FALSE;
609 }
610
611 default:
612 ; /* fall-through */
613 }
614 return GL_FALSE;
615 }
616
617
618 /**
619 * Test if the given image format is a color/RGBA format (i.e., not color
620 * index, depth, stencil, etc).
621 * \param format the image format value (may by an internal texture format)
622 * \return GL_TRUE if its a color/RGBA format, GL_FALSE otherwise.
623 */
624 GLboolean
625 _mesa_is_color_format(GLenum format)
626 {
627 switch (format) {
628 case GL_RED:
629 case GL_GREEN:
630 case GL_BLUE:
631 case GL_ALPHA:
632 case GL_ALPHA4:
633 case GL_ALPHA8:
634 case GL_ALPHA12:
635 case GL_ALPHA16:
636 case 1:
637 case GL_LUMINANCE:
638 case GL_LUMINANCE4:
639 case GL_LUMINANCE8:
640 case GL_LUMINANCE12:
641 case GL_LUMINANCE16:
642 case 2:
643 case GL_LUMINANCE_ALPHA:
644 case GL_LUMINANCE4_ALPHA4:
645 case GL_LUMINANCE6_ALPHA2:
646 case GL_LUMINANCE8_ALPHA8:
647 case GL_LUMINANCE12_ALPHA4:
648 case GL_LUMINANCE12_ALPHA12:
649 case GL_LUMINANCE16_ALPHA16:
650 case GL_INTENSITY:
651 case GL_INTENSITY4:
652 case GL_INTENSITY8:
653 case GL_INTENSITY12:
654 case GL_INTENSITY16:
655 case GL_R8:
656 case GL_R16:
657 case GL_RG:
658 case GL_RG8:
659 case GL_RG16:
660 case 3:
661 case GL_RGB:
662 case GL_BGR:
663 case GL_R3_G3_B2:
664 case GL_RGB4:
665 case GL_RGB5:
666 case GL_RGB8:
667 case GL_RGB10:
668 case GL_RGB12:
669 case GL_RGB16:
670 case 4:
671 case GL_ABGR_EXT:
672 case GL_RGBA:
673 case GL_BGRA:
674 case GL_RGBA2:
675 case GL_RGBA4:
676 case GL_RGB5_A1:
677 case GL_RGBA8:
678 case GL_RGB10_A2:
679 case GL_RGBA12:
680 case GL_RGBA16:
681 /* float texture formats */
682 case GL_ALPHA16F_ARB:
683 case GL_ALPHA32F_ARB:
684 case GL_LUMINANCE16F_ARB:
685 case GL_LUMINANCE32F_ARB:
686 case GL_LUMINANCE_ALPHA16F_ARB:
687 case GL_LUMINANCE_ALPHA32F_ARB:
688 case GL_INTENSITY16F_ARB:
689 case GL_INTENSITY32F_ARB:
690 case GL_R16F:
691 case GL_R32F:
692 case GL_RG16F:
693 case GL_RG32F:
694 case GL_RGB16F_ARB:
695 case GL_RGB32F_ARB:
696 case GL_RGBA16F_ARB:
697 case GL_RGBA32F_ARB:
698 /* compressed formats */
699 case GL_COMPRESSED_ALPHA:
700 case GL_COMPRESSED_LUMINANCE:
701 case GL_COMPRESSED_LUMINANCE_ALPHA:
702 case GL_COMPRESSED_INTENSITY:
703 case GL_COMPRESSED_RED:
704 case GL_COMPRESSED_RG:
705 case GL_COMPRESSED_RGB:
706 case GL_COMPRESSED_RGBA:
707 case GL_RGB_S3TC:
708 case GL_RGB4_S3TC:
709 case GL_RGBA_S3TC:
710 case GL_RGBA4_S3TC:
711 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
712 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
713 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
714 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
715 case GL_COMPRESSED_RGB_FXT1_3DFX:
716 case GL_COMPRESSED_RGBA_FXT1_3DFX:
717 #if FEATURE_EXT_texture_sRGB
718 case GL_SRGB_EXT:
719 case GL_SRGB8_EXT:
720 case GL_SRGB_ALPHA_EXT:
721 case GL_SRGB8_ALPHA8_EXT:
722 case GL_SLUMINANCE_ALPHA_EXT:
723 case GL_SLUMINANCE8_ALPHA8_EXT:
724 case GL_SLUMINANCE_EXT:
725 case GL_SLUMINANCE8_EXT:
726 case GL_COMPRESSED_SRGB_EXT:
727 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
728 case GL_COMPRESSED_SRGB_ALPHA_EXT:
729 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
730 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
731 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
732 case GL_COMPRESSED_SLUMINANCE_EXT:
733 case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
734 #endif /* FEATURE_EXT_texture_sRGB */
735 case GL_COMPRESSED_RED_RGTC1:
736 case GL_COMPRESSED_SIGNED_RED_RGTC1:
737 case GL_COMPRESSED_RG_RGTC2:
738 case GL_COMPRESSED_SIGNED_RG_RGTC2:
739 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
740 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
741 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
742 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
743 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
744 /* generic integer formats */
745 case GL_RED_INTEGER_EXT:
746 case GL_GREEN_INTEGER_EXT:
747 case GL_BLUE_INTEGER_EXT:
748 case GL_ALPHA_INTEGER_EXT:
749 case GL_RGB_INTEGER_EXT:
750 case GL_RGBA_INTEGER_EXT:
751 case GL_BGR_INTEGER_EXT:
752 case GL_BGRA_INTEGER_EXT:
753 case GL_LUMINANCE_INTEGER_EXT:
754 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
755 /* sized integer formats */
756 case GL_RGBA32UI_EXT:
757 case GL_RGB32UI_EXT:
758 case GL_ALPHA32UI_EXT:
759 case GL_INTENSITY32UI_EXT:
760 case GL_LUMINANCE32UI_EXT:
761 case GL_LUMINANCE_ALPHA32UI_EXT:
762 case GL_RGBA16UI_EXT:
763 case GL_RGB16UI_EXT:
764 case GL_ALPHA16UI_EXT:
765 case GL_INTENSITY16UI_EXT:
766 case GL_LUMINANCE16UI_EXT:
767 case GL_LUMINANCE_ALPHA16UI_EXT:
768 case GL_RGBA8UI_EXT:
769 case GL_RGB8UI_EXT:
770 case GL_ALPHA8UI_EXT:
771 case GL_INTENSITY8UI_EXT:
772 case GL_LUMINANCE8UI_EXT:
773 case GL_LUMINANCE_ALPHA8UI_EXT:
774 case GL_RGBA32I_EXT:
775 case GL_RGB32I_EXT:
776 case GL_ALPHA32I_EXT:
777 case GL_INTENSITY32I_EXT:
778 case GL_LUMINANCE32I_EXT:
779 case GL_LUMINANCE_ALPHA32I_EXT:
780 case GL_RGBA16I_EXT:
781 case GL_RGB16I_EXT:
782 case GL_ALPHA16I_EXT:
783 case GL_INTENSITY16I_EXT:
784 case GL_LUMINANCE16I_EXT:
785 case GL_LUMINANCE_ALPHA16I_EXT:
786 case GL_RGBA8I_EXT:
787 case GL_RGB8I_EXT:
788 case GL_ALPHA8I_EXT:
789 case GL_INTENSITY8I_EXT:
790 case GL_LUMINANCE8I_EXT:
791 case GL_LUMINANCE_ALPHA8I_EXT:
792 /* signed, normalized texture formats */
793 case GL_RED_SNORM:
794 case GL_R8_SNORM:
795 case GL_R16_SNORM:
796 case GL_RG_SNORM:
797 case GL_RG8_SNORM:
798 case GL_RG16_SNORM:
799 case GL_RGB_SNORM:
800 case GL_RGB8_SNORM:
801 case GL_RGB16_SNORM:
802 case GL_RGBA_SNORM:
803 case GL_RGBA8_SNORM:
804 case GL_RGBA16_SNORM:
805 case GL_ALPHA_SNORM:
806 case GL_ALPHA8_SNORM:
807 case GL_ALPHA16_SNORM:
808 case GL_LUMINANCE_SNORM:
809 case GL_LUMINANCE8_SNORM:
810 case GL_LUMINANCE16_SNORM:
811 case GL_LUMINANCE_ALPHA_SNORM:
812 case GL_LUMINANCE8_ALPHA8_SNORM:
813 case GL_LUMINANCE16_ALPHA16_SNORM:
814 case GL_INTENSITY_SNORM:
815 case GL_INTENSITY8_SNORM:
816 case GL_INTENSITY16_SNORM:
817 case GL_RGB9_E5:
818 case GL_R11F_G11F_B10F:
819 case GL_RGB10_A2UI:
820 return GL_TRUE;
821 case GL_YCBCR_MESA: /* not considered to be RGB */
822 /* fall-through */
823 default:
824 return GL_FALSE;
825 }
826 }
827
828
829 /**
830 * Test if the given image format is a depth component format.
831 */
832 GLboolean
833 _mesa_is_depth_format(GLenum format)
834 {
835 switch (format) {
836 case GL_DEPTH_COMPONENT:
837 case GL_DEPTH_COMPONENT16:
838 case GL_DEPTH_COMPONENT24:
839 case GL_DEPTH_COMPONENT32:
840 case GL_DEPTH_COMPONENT32F:
841 return GL_TRUE;
842 default:
843 return GL_FALSE;
844 }
845 }
846
847
848 /**
849 * Test if the given image format is a stencil format.
850 */
851 GLboolean
852 _mesa_is_stencil_format(GLenum format)
853 {
854 switch (format) {
855 case GL_STENCIL_INDEX:
856 case GL_DEPTH_STENCIL:
857 return GL_TRUE;
858 default:
859 return GL_FALSE;
860 }
861 }
862
863
864 /**
865 * Test if the given image format is a YCbCr format.
866 */
867 GLboolean
868 _mesa_is_ycbcr_format(GLenum format)
869 {
870 switch (format) {
871 case GL_YCBCR_MESA:
872 return GL_TRUE;
873 default:
874 return GL_FALSE;
875 }
876 }
877
878
879 /**
880 * Test if the given image format is a depth+stencil format.
881 */
882 GLboolean
883 _mesa_is_depthstencil_format(GLenum format)
884 {
885 switch (format) {
886 case GL_DEPTH24_STENCIL8_EXT:
887 case GL_DEPTH_STENCIL_EXT:
888 case GL_DEPTH32F_STENCIL8:
889 return GL_TRUE;
890 default:
891 return GL_FALSE;
892 }
893 }
894
895
896 /**
897 * Test if the given image format is a depth or stencil format.
898 */
899 GLboolean
900 _mesa_is_depth_or_stencil_format(GLenum format)
901 {
902 switch (format) {
903 case GL_DEPTH_COMPONENT:
904 case GL_DEPTH_COMPONENT16:
905 case GL_DEPTH_COMPONENT24:
906 case GL_DEPTH_COMPONENT32:
907 case GL_STENCIL_INDEX:
908 case GL_STENCIL_INDEX1_EXT:
909 case GL_STENCIL_INDEX4_EXT:
910 case GL_STENCIL_INDEX8_EXT:
911 case GL_STENCIL_INDEX16_EXT:
912 case GL_DEPTH_STENCIL_EXT:
913 case GL_DEPTH24_STENCIL8_EXT:
914 case GL_DEPTH_COMPONENT32F:
915 case GL_DEPTH32F_STENCIL8:
916 return GL_TRUE;
917 default:
918 return GL_FALSE;
919 }
920 }
921
922
923 /**
924 * Test if the given image format is a dudv format.
925 */
926 GLboolean
927 _mesa_is_dudv_format(GLenum format)
928 {
929 switch (format) {
930 case GL_DUDV_ATI:
931 case GL_DU8DV8_ATI:
932 return GL_TRUE;
933 default:
934 return GL_FALSE;
935 }
936 }
937
938
939 /**
940 * Test if the given format is an integer (non-normalized) format.
941 */
942 GLboolean
943 _mesa_is_integer_format(GLenum format)
944 {
945 switch (format) {
946 /* generic integer formats */
947 case GL_RED_INTEGER_EXT:
948 case GL_GREEN_INTEGER_EXT:
949 case GL_BLUE_INTEGER_EXT:
950 case GL_ALPHA_INTEGER_EXT:
951 case GL_RGB_INTEGER_EXT:
952 case GL_RGBA_INTEGER_EXT:
953 case GL_BGR_INTEGER_EXT:
954 case GL_BGRA_INTEGER_EXT:
955 case GL_LUMINANCE_INTEGER_EXT:
956 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
957 /* specific integer formats */
958 case GL_RGBA32UI_EXT:
959 case GL_RGB32UI_EXT:
960 case GL_RG32UI:
961 case GL_R32UI:
962 case GL_ALPHA32UI_EXT:
963 case GL_INTENSITY32UI_EXT:
964 case GL_LUMINANCE32UI_EXT:
965 case GL_LUMINANCE_ALPHA32UI_EXT:
966 case GL_RGBA16UI_EXT:
967 case GL_RGB16UI_EXT:
968 case GL_RG16UI:
969 case GL_R16UI:
970 case GL_ALPHA16UI_EXT:
971 case GL_INTENSITY16UI_EXT:
972 case GL_LUMINANCE16UI_EXT:
973 case GL_LUMINANCE_ALPHA16UI_EXT:
974 case GL_RGBA8UI_EXT:
975 case GL_RGB8UI_EXT:
976 case GL_RG8UI:
977 case GL_R8UI:
978 case GL_ALPHA8UI_EXT:
979 case GL_INTENSITY8UI_EXT:
980 case GL_LUMINANCE8UI_EXT:
981 case GL_LUMINANCE_ALPHA8UI_EXT:
982 case GL_RGBA32I_EXT:
983 case GL_RGB32I_EXT:
984 case GL_RG32I:
985 case GL_R32I:
986 case GL_ALPHA32I_EXT:
987 case GL_INTENSITY32I_EXT:
988 case GL_LUMINANCE32I_EXT:
989 case GL_LUMINANCE_ALPHA32I_EXT:
990 case GL_RGBA16I_EXT:
991 case GL_RGB16I_EXT:
992 case GL_RG16I:
993 case GL_R16I:
994 case GL_ALPHA16I_EXT:
995 case GL_INTENSITY16I_EXT:
996 case GL_LUMINANCE16I_EXT:
997 case GL_LUMINANCE_ALPHA16I_EXT:
998 case GL_RGBA8I_EXT:
999 case GL_RGB8I_EXT:
1000 case GL_RG8I:
1001 case GL_R8I:
1002 case GL_ALPHA8I_EXT:
1003 case GL_INTENSITY8I_EXT:
1004 case GL_LUMINANCE8I_EXT:
1005 case GL_LUMINANCE_ALPHA8I_EXT:
1006 case GL_RGB10_A2UI:
1007 return GL_TRUE;
1008 default:
1009 return GL_FALSE;
1010 }
1011 }
1012
1013
1014 /**
1015 * Test if an image format is a supported compressed format.
1016 * \param format the internal format token provided by the user.
1017 * \return GL_TRUE if compressed, GL_FALSE if uncompressed
1018 */
1019 GLboolean
1020 _mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
1021 {
1022 switch (format) {
1023 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
1024 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
1025 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
1026 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
1027 return ctx->Extensions.EXT_texture_compression_s3tc;
1028 case GL_RGB_S3TC:
1029 case GL_RGB4_S3TC:
1030 case GL_RGBA_S3TC:
1031 case GL_RGBA4_S3TC:
1032 return ctx->Extensions.S3_s3tc;
1033 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
1034 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
1035 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
1036 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
1037 return ctx->Extensions.EXT_texture_sRGB
1038 && ctx->Extensions.EXT_texture_compression_s3tc;
1039 case GL_COMPRESSED_RGB_FXT1_3DFX:
1040 case GL_COMPRESSED_RGBA_FXT1_3DFX:
1041 return ctx->Extensions.TDFX_texture_compression_FXT1;
1042 case GL_COMPRESSED_RED_RGTC1:
1043 case GL_COMPRESSED_SIGNED_RED_RGTC1:
1044 case GL_COMPRESSED_RG_RGTC2:
1045 case GL_COMPRESSED_SIGNED_RG_RGTC2:
1046 return ctx->Extensions.ARB_texture_compression_rgtc;
1047 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
1048 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
1049 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
1050 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
1051 return ctx->Extensions.EXT_texture_compression_latc;
1052 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
1053 return ctx->Extensions.ATI_texture_compression_3dc;
1054 #if FEATURE_ES
1055 case GL_PALETTE4_RGB8_OES:
1056 case GL_PALETTE4_RGBA8_OES:
1057 case GL_PALETTE4_R5_G6_B5_OES:
1058 case GL_PALETTE4_RGBA4_OES:
1059 case GL_PALETTE4_RGB5_A1_OES:
1060 case GL_PALETTE8_RGB8_OES:
1061 case GL_PALETTE8_RGBA8_OES:
1062 case GL_PALETTE8_R5_G6_B5_OES:
1063 case GL_PALETTE8_RGBA4_OES:
1064 case GL_PALETTE8_RGB5_A1_OES:
1065 return ctx->API == API_OPENGLES;
1066 #endif
1067 default:
1068 return GL_FALSE;
1069 }
1070 }
1071
1072
1073 /**
1074 * Does the given base texture/renderbuffer format have the channel
1075 * named by 'pname'?
1076 */
1077 GLboolean
1078 _mesa_base_format_has_channel(GLenum base_format, GLenum pname)
1079 {
1080 switch (pname) {
1081 case GL_TEXTURE_RED_SIZE:
1082 case GL_TEXTURE_RED_TYPE:
1083 case GL_RENDERBUFFER_RED_SIZE_EXT:
1084 case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
1085 if (base_format == GL_RED ||
1086 base_format == GL_RG ||
1087 base_format == GL_RGB ||
1088 base_format == GL_RGBA) {
1089 return GL_TRUE;
1090 }
1091 return GL_FALSE;
1092 case GL_TEXTURE_GREEN_SIZE:
1093 case GL_TEXTURE_GREEN_TYPE:
1094 case GL_RENDERBUFFER_GREEN_SIZE_EXT:
1095 case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
1096 if (base_format == GL_RG ||
1097 base_format == GL_RGB ||
1098 base_format == GL_RGBA) {
1099 return GL_TRUE;
1100 }
1101 return GL_FALSE;
1102 case GL_TEXTURE_BLUE_SIZE:
1103 case GL_TEXTURE_BLUE_TYPE:
1104 case GL_RENDERBUFFER_BLUE_SIZE_EXT:
1105 case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
1106 if (base_format == GL_RGB ||
1107 base_format == GL_RGBA) {
1108 return GL_TRUE;
1109 }
1110 return GL_FALSE;
1111 case GL_TEXTURE_ALPHA_SIZE:
1112 case GL_TEXTURE_ALPHA_TYPE:
1113 case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
1114 case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
1115 if (base_format == GL_RGBA ||
1116 base_format == GL_ALPHA ||
1117 base_format == GL_LUMINANCE_ALPHA) {
1118 return GL_TRUE;
1119 }
1120 return GL_FALSE;
1121 case GL_TEXTURE_LUMINANCE_SIZE:
1122 case GL_TEXTURE_LUMINANCE_TYPE:
1123 if (base_format == GL_LUMINANCE ||
1124 base_format == GL_LUMINANCE_ALPHA) {
1125 return GL_TRUE;
1126 }
1127 return GL_FALSE;
1128 case GL_TEXTURE_INTENSITY_SIZE:
1129 case GL_TEXTURE_INTENSITY_TYPE:
1130 if (base_format == GL_INTENSITY) {
1131 return GL_TRUE;
1132 }
1133 return GL_FALSE;
1134 case GL_TEXTURE_DEPTH_SIZE:
1135 case GL_TEXTURE_DEPTH_TYPE:
1136 case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
1137 case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
1138 if (base_format == GL_DEPTH_STENCIL ||
1139 base_format == GL_DEPTH_COMPONENT) {
1140 return GL_TRUE;
1141 }
1142 return GL_FALSE;
1143 case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
1144 case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
1145 if (base_format == GL_DEPTH_STENCIL ||
1146 base_format == GL_STENCIL_INDEX) {
1147 return GL_TRUE;
1148 }
1149 return GL_FALSE;
1150 default:
1151 _mesa_warning(NULL, "%s: Unexpected channel token 0x%x\n",
1152 __FUNCTION__, pname);
1153 return GL_FALSE;
1154 }
1155
1156 return GL_FALSE;
1157 }
1158
1159
1160 /**
1161 * Return the address of a specific pixel in an image (1D, 2D or 3D).
1162 *
1163 * Pixel unpacking/packing parameters are observed according to \p packing.
1164 *
1165 * \param dimensions either 1, 2 or 3 to indicate dimensionality of image
1166 * \param image starting address of image data
1167 * \param width the image width
1168 * \param height theimage height
1169 * \param format the pixel format
1170 * \param type the pixel data type
1171 * \param packing the pixelstore attributes
1172 * \param img which image in the volume (0 for 1D or 2D images)
1173 * \param row row of pixel in the image (0 for 1D images)
1174 * \param column column of pixel in the image
1175 *
1176 * \return address of pixel on success, or NULL on error.
1177 *
1178 * \sa gl_pixelstore_attrib.
1179 */
1180 GLvoid *
1181 _mesa_image_address( GLuint dimensions,
1182 const struct gl_pixelstore_attrib *packing,
1183 const GLvoid *image,
1184 GLsizei width, GLsizei height,
1185 GLenum format, GLenum type,
1186 GLint img, GLint row, GLint column )
1187 {
1188 GLint alignment; /* 1, 2 or 4 */
1189 GLint pixels_per_row;
1190 GLint rows_per_image;
1191 GLint skiprows;
1192 GLint skippixels;
1193 GLint skipimages; /* for 3-D volume images */
1194 GLubyte *pixel_addr;
1195
1196 ASSERT(dimensions >= 1 && dimensions <= 3);
1197
1198 alignment = packing->Alignment;
1199 if (packing->RowLength > 0) {
1200 pixels_per_row = packing->RowLength;
1201 }
1202 else {
1203 pixels_per_row = width;
1204 }
1205 if (packing->ImageHeight > 0) {
1206 rows_per_image = packing->ImageHeight;
1207 }
1208 else {
1209 rows_per_image = height;
1210 }
1211
1212 skippixels = packing->SkipPixels;
1213 /* Note: SKIP_ROWS _is_ used for 1D images */
1214 skiprows = packing->SkipRows;
1215 /* Note: SKIP_IMAGES is only used for 3D images */
1216 skipimages = (dimensions == 3) ? packing->SkipImages : 0;
1217
1218 if (type == GL_BITMAP) {
1219 /* BITMAP data */
1220 GLint comp_per_pixel; /* components per pixel */
1221 GLint bytes_per_comp; /* bytes per component */
1222 GLint bytes_per_row;
1223 GLint bytes_per_image;
1224
1225 /* Compute bytes per component */
1226 bytes_per_comp = _mesa_sizeof_packed_type( type );
1227 if (bytes_per_comp < 0) {
1228 return NULL;
1229 }
1230
1231 /* Compute number of components per pixel */
1232 comp_per_pixel = _mesa_components_in_format( format );
1233 if (comp_per_pixel < 0) {
1234 return NULL;
1235 }
1236
1237 bytes_per_row = alignment
1238 * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
1239
1240 bytes_per_image = bytes_per_row * rows_per_image;
1241
1242 pixel_addr = (GLubyte *) image
1243 + (skipimages + img) * bytes_per_image
1244 + (skiprows + row) * bytes_per_row
1245 + (skippixels + column) / 8;
1246 }
1247 else {
1248 /* Non-BITMAP data */
1249 GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
1250 GLint topOfImage;
1251
1252 bytes_per_pixel = _mesa_bytes_per_pixel( format, type );
1253
1254 /* The pixel type and format should have been error checked earlier */
1255 assert(bytes_per_pixel > 0);
1256
1257 bytes_per_row = pixels_per_row * bytes_per_pixel;
1258 remainder = bytes_per_row % alignment;
1259 if (remainder > 0)
1260 bytes_per_row += (alignment - remainder);
1261
1262 ASSERT(bytes_per_row % alignment == 0);
1263
1264 bytes_per_image = bytes_per_row * rows_per_image;
1265
1266 if (packing->Invert) {
1267 /* set pixel_addr to the last row */
1268 topOfImage = bytes_per_row * (height - 1);
1269 bytes_per_row = -bytes_per_row;
1270 }
1271 else {
1272 topOfImage = 0;
1273 }
1274
1275 /* compute final pixel address */
1276 pixel_addr = (GLubyte *) image
1277 + (skipimages + img) * bytes_per_image
1278 + topOfImage
1279 + (skiprows + row) * bytes_per_row
1280 + (skippixels + column) * bytes_per_pixel;
1281 }
1282
1283 return (GLvoid *) pixel_addr;
1284 }
1285
1286
1287 GLvoid *
1288 _mesa_image_address1d( const struct gl_pixelstore_attrib *packing,
1289 const GLvoid *image,
1290 GLsizei width,
1291 GLenum format, GLenum type,
1292 GLint column )
1293 {
1294 return _mesa_image_address(1, packing, image, width, 1,
1295 format, type, 0, 0, column);
1296 }
1297
1298
1299 GLvoid *
1300 _mesa_image_address2d( const struct gl_pixelstore_attrib *packing,
1301 const GLvoid *image,
1302 GLsizei width, GLsizei height,
1303 GLenum format, GLenum type,
1304 GLint row, GLint column )
1305 {
1306 return _mesa_image_address(2, packing, image, width, height,
1307 format, type, 0, row, column);
1308 }
1309
1310
1311 GLvoid *
1312 _mesa_image_address3d( const struct gl_pixelstore_attrib *packing,
1313 const GLvoid *image,
1314 GLsizei width, GLsizei height,
1315 GLenum format, GLenum type,
1316 GLint img, GLint row, GLint column )
1317 {
1318 return _mesa_image_address(3, packing, image, width, height,
1319 format, type, img, row, column);
1320 }
1321
1322
1323
1324 /**
1325 * Compute the stride (in bytes) between image rows.
1326 *
1327 * \param packing the pixelstore attributes
1328 * \param width image width.
1329 * \param format pixel format.
1330 * \param type pixel data type.
1331 *
1332 * \return the stride in bytes for the given parameters, or -1 if error
1333 */
1334 GLint
1335 _mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
1336 GLint width, GLenum format, GLenum type )
1337 {
1338 GLint bytesPerRow, remainder;
1339
1340 ASSERT(packing);
1341
1342 if (type == GL_BITMAP) {
1343 if (packing->RowLength == 0) {
1344 bytesPerRow = (width + 7) / 8;
1345 }
1346 else {
1347 bytesPerRow = (packing->RowLength + 7) / 8;
1348 }
1349 }
1350 else {
1351 /* Non-BITMAP data */
1352 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1353 if (bytesPerPixel <= 0)
1354 return -1; /* error */
1355 if (packing->RowLength == 0) {
1356 bytesPerRow = bytesPerPixel * width;
1357 }
1358 else {
1359 bytesPerRow = bytesPerPixel * packing->RowLength;
1360 }
1361 }
1362
1363 remainder = bytesPerRow % packing->Alignment;
1364 if (remainder > 0) {
1365 bytesPerRow += (packing->Alignment - remainder);
1366 }
1367
1368 if (packing->Invert) {
1369 /* negate the bytes per row (negative row stride) */
1370 bytesPerRow = -bytesPerRow;
1371 }
1372
1373 return bytesPerRow;
1374 }
1375
1376
1377 /*
1378 * Compute the stride between images in a 3D texture (in bytes) for the given
1379 * pixel packing parameters and image width, format and type.
1380 */
1381 GLint
1382 _mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
1383 GLint width, GLint height,
1384 GLenum format, GLenum type )
1385 {
1386 GLint bytesPerRow, bytesPerImage, remainder;
1387
1388 ASSERT(packing);
1389
1390 if (type == GL_BITMAP) {
1391 if (packing->RowLength == 0) {
1392 bytesPerRow = (width + 7) / 8;
1393 }
1394 else {
1395 bytesPerRow = (packing->RowLength + 7) / 8;
1396 }
1397 }
1398 else {
1399 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1400
1401 if (bytesPerPixel <= 0)
1402 return -1; /* error */
1403 if (packing->RowLength == 0) {
1404 bytesPerRow = bytesPerPixel * width;
1405 }
1406 else {
1407 bytesPerRow = bytesPerPixel * packing->RowLength;
1408 }
1409 }
1410
1411 remainder = bytesPerRow % packing->Alignment;
1412 if (remainder > 0)
1413 bytesPerRow += (packing->Alignment - remainder);
1414
1415 if (packing->ImageHeight == 0)
1416 bytesPerImage = bytesPerRow * height;
1417 else
1418 bytesPerImage = bytesPerRow * packing->ImageHeight;
1419
1420 return bytesPerImage;
1421 }
1422
1423
1424
1425 /**
1426 * "Expand" a bitmap from 1-bit per pixel to 8-bits per pixel.
1427 * This is typically used to convert a bitmap into a GLubyte/pixel texture.
1428 * "On" bits will set texels to \p onValue.
1429 * "Off" bits will not modify texels.
1430 * \param width src bitmap width in pixels
1431 * \param height src bitmap height in pixels
1432 * \param unpack bitmap unpacking state
1433 * \param bitmap the src bitmap data
1434 * \param destBuffer start of dest buffer
1435 * \param destStride row stride in dest buffer
1436 * \param onValue if bit is 1, set destBuffer pixel to this value
1437 */
1438 void
1439 _mesa_expand_bitmap(GLsizei width, GLsizei height,
1440 const struct gl_pixelstore_attrib *unpack,
1441 const GLubyte *bitmap,
1442 GLubyte *destBuffer, GLint destStride,
1443 GLubyte onValue)
1444 {
1445 const GLubyte *srcRow = (const GLubyte *)
1446 _mesa_image_address2d(unpack, bitmap, width, height,
1447 GL_COLOR_INDEX, GL_BITMAP, 0, 0);
1448 const GLint srcStride = _mesa_image_row_stride(unpack, width,
1449 GL_COLOR_INDEX, GL_BITMAP);
1450 GLint row, col;
1451
1452 #define SET_PIXEL(COL, ROW) \
1453 destBuffer[(ROW) * destStride + (COL)] = onValue;
1454
1455 for (row = 0; row < height; row++) {
1456 const GLubyte *src = srcRow;
1457
1458 if (unpack->LsbFirst) {
1459 /* Lsb first */
1460 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
1461 for (col = 0; col < width; col++) {
1462
1463 if (*src & mask) {
1464 SET_PIXEL(col, row);
1465 }
1466
1467 if (mask == 128U) {
1468 src++;
1469 mask = 1U;
1470 }
1471 else {
1472 mask = mask << 1;
1473 }
1474 }
1475
1476 /* get ready for next row */
1477 if (mask != 1)
1478 src++;
1479 }
1480 else {
1481 /* Msb first */
1482 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
1483 for (col = 0; col < width; col++) {
1484
1485 if (*src & mask) {
1486 SET_PIXEL(col, row);
1487 }
1488
1489 if (mask == 1U) {
1490 src++;
1491 mask = 128U;
1492 }
1493 else {
1494 mask = mask >> 1;
1495 }
1496 }
1497
1498 /* get ready for next row */
1499 if (mask != 128)
1500 src++;
1501 }
1502
1503 srcRow += srcStride;
1504 } /* row */
1505
1506 #undef SET_PIXEL
1507 }
1508
1509
1510
1511
1512 /**
1513 * Convert an array of RGBA colors from one datatype to another.
1514 * NOTE: src may equal dst. In that case, we use a temporary buffer.
1515 */
1516 void
1517 _mesa_convert_colors(GLenum srcType, const GLvoid *src,
1518 GLenum dstType, GLvoid *dst,
1519 GLuint count, const GLubyte mask[])
1520 {
1521 GLuint tempBuffer[MAX_WIDTH][4];
1522 const GLboolean useTemp = (src == dst);
1523
1524 ASSERT(srcType != dstType);
1525
1526 switch (srcType) {
1527 case GL_UNSIGNED_BYTE:
1528 if (dstType == GL_UNSIGNED_SHORT) {
1529 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1530 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1531 GLuint i;
1532 for (i = 0; i < count; i++) {
1533 if (!mask || mask[i]) {
1534 dst2[i][RCOMP] = UBYTE_TO_USHORT(src1[i][RCOMP]);
1535 dst2[i][GCOMP] = UBYTE_TO_USHORT(src1[i][GCOMP]);
1536 dst2[i][BCOMP] = UBYTE_TO_USHORT(src1[i][BCOMP]);
1537 dst2[i][ACOMP] = UBYTE_TO_USHORT(src1[i][ACOMP]);
1538 }
1539 }
1540 if (useTemp)
1541 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1542 }
1543 else {
1544 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1545 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1546 GLuint i;
1547 ASSERT(dstType == GL_FLOAT);
1548 for (i = 0; i < count; i++) {
1549 if (!mask || mask[i]) {
1550 dst4[i][RCOMP] = UBYTE_TO_FLOAT(src1[i][RCOMP]);
1551 dst4[i][GCOMP] = UBYTE_TO_FLOAT(src1[i][GCOMP]);
1552 dst4[i][BCOMP] = UBYTE_TO_FLOAT(src1[i][BCOMP]);
1553 dst4[i][ACOMP] = UBYTE_TO_FLOAT(src1[i][ACOMP]);
1554 }
1555 }
1556 if (useTemp)
1557 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1558 }
1559 break;
1560 case GL_UNSIGNED_SHORT:
1561 if (dstType == GL_UNSIGNED_BYTE) {
1562 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1563 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1564 GLuint i;
1565 for (i = 0; i < count; i++) {
1566 if (!mask || mask[i]) {
1567 dst1[i][RCOMP] = USHORT_TO_UBYTE(src2[i][RCOMP]);
1568 dst1[i][GCOMP] = USHORT_TO_UBYTE(src2[i][GCOMP]);
1569 dst1[i][BCOMP] = USHORT_TO_UBYTE(src2[i][BCOMP]);
1570 dst1[i][ACOMP] = USHORT_TO_UBYTE(src2[i][ACOMP]);
1571 }
1572 }
1573 if (useTemp)
1574 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1575 }
1576 else {
1577 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1578 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
1579 GLuint i;
1580 ASSERT(dstType == GL_FLOAT);
1581 for (i = 0; i < count; i++) {
1582 if (!mask || mask[i]) {
1583 dst4[i][RCOMP] = USHORT_TO_FLOAT(src2[i][RCOMP]);
1584 dst4[i][GCOMP] = USHORT_TO_FLOAT(src2[i][GCOMP]);
1585 dst4[i][BCOMP] = USHORT_TO_FLOAT(src2[i][BCOMP]);
1586 dst4[i][ACOMP] = USHORT_TO_FLOAT(src2[i][ACOMP]);
1587 }
1588 }
1589 if (useTemp)
1590 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1591 }
1592 break;
1593 case GL_FLOAT:
1594 if (dstType == GL_UNSIGNED_BYTE) {
1595 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1596 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1597 GLuint i;
1598 for (i = 0; i < count; i++) {
1599 if (!mask || mask[i])
1600 _mesa_unclamped_float_rgba_to_ubyte(dst1[i], src4[i]);
1601 }
1602 if (useTemp)
1603 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1604 }
1605 else {
1606 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1607 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
1608 GLuint i;
1609 ASSERT(dstType == GL_UNSIGNED_SHORT);
1610 for (i = 0; i < count; i++) {
1611 if (!mask || mask[i]) {
1612 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][RCOMP], src4[i][RCOMP]);
1613 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][GCOMP], src4[i][GCOMP]);
1614 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][BCOMP], src4[i][BCOMP]);
1615 UNCLAMPED_FLOAT_TO_USHORT(dst2[i][ACOMP], src4[i][ACOMP]);
1616 }
1617 }
1618 if (useTemp)
1619 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1620 }
1621 break;
1622 default:
1623 _mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");
1624 }
1625 }
1626
1627
1628
1629
1630 /**
1631 * Perform basic clipping for glDrawPixels. The image's position and size
1632 * and the unpack SkipPixels and SkipRows are adjusted so that the image
1633 * region is entirely within the window and scissor bounds.
1634 * NOTE: this will only work when glPixelZoom is (1, 1) or (1, -1).
1635 * If Pixel.ZoomY is -1, *destY will be changed to be the first row which
1636 * we'll actually write. Beforehand, *destY-1 is the first drawing row.
1637 *
1638 * \return GL_TRUE if image is ready for drawing or
1639 * GL_FALSE if image was completely clipped away (draw nothing)
1640 */
1641 GLboolean
1642 _mesa_clip_drawpixels(const struct gl_context *ctx,
1643 GLint *destX, GLint *destY,
1644 GLsizei *width, GLsizei *height,
1645 struct gl_pixelstore_attrib *unpack)
1646 {
1647 const struct gl_framebuffer *buffer = ctx->DrawBuffer;
1648
1649 if (unpack->RowLength == 0) {
1650 unpack->RowLength = *width;
1651 }
1652
1653 ASSERT(ctx->Pixel.ZoomX == 1.0F);
1654 ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);
1655
1656 /* left clipping */
1657 if (*destX < buffer->_Xmin) {
1658 unpack->SkipPixels += (buffer->_Xmin - *destX);
1659 *width -= (buffer->_Xmin - *destX);
1660 *destX = buffer->_Xmin;
1661 }
1662 /* right clipping */
1663 if (*destX + *width > buffer->_Xmax)
1664 *width -= (*destX + *width - buffer->_Xmax);
1665
1666 if (*width <= 0)
1667 return GL_FALSE;
1668
1669 if (ctx->Pixel.ZoomY == 1.0F) {
1670 /* bottom clipping */
1671 if (*destY < buffer->_Ymin) {
1672 unpack->SkipRows += (buffer->_Ymin - *destY);
1673 *height -= (buffer->_Ymin - *destY);
1674 *destY = buffer->_Ymin;
1675 }
1676 /* top clipping */
1677 if (*destY + *height > buffer->_Ymax)
1678 *height -= (*destY + *height - buffer->_Ymax);
1679 }
1680 else { /* upside down */
1681 /* top clipping */
1682 if (*destY > buffer->_Ymax) {
1683 unpack->SkipRows += (*destY - buffer->_Ymax);
1684 *height -= (*destY - buffer->_Ymax);
1685 *destY = buffer->_Ymax;
1686 }
1687 /* bottom clipping */
1688 if (*destY - *height < buffer->_Ymin)
1689 *height -= (buffer->_Ymin - (*destY - *height));
1690 /* adjust destY so it's the first row to write to */
1691 (*destY)--;
1692 }
1693
1694 if (*height <= 0)
1695 return GL_FALSE;
1696
1697 return GL_TRUE;
1698 }
1699
1700
1701 /**
1702 * Perform clipping for glReadPixels. The image's window position
1703 * and size, and the pack skipPixels, skipRows and rowLength are adjusted
1704 * so that the image region is entirely within the window bounds.
1705 * Note: this is different from _mesa_clip_drawpixels() in that the
1706 * scissor box is ignored, and we use the bounds of the current readbuffer
1707 * surface.
1708 *
1709 * \return GL_TRUE if region to read is in bounds
1710 * GL_FALSE if region is completely out of bounds (nothing to read)
1711 */
1712 GLboolean
1713 _mesa_clip_readpixels(const struct gl_context *ctx,
1714 GLint *srcX, GLint *srcY,
1715 GLsizei *width, GLsizei *height,
1716 struct gl_pixelstore_attrib *pack)
1717 {
1718 const struct gl_framebuffer *buffer = ctx->ReadBuffer;
1719
1720 if (pack->RowLength == 0) {
1721 pack->RowLength = *width;
1722 }
1723
1724 /* left clipping */
1725 if (*srcX < 0) {
1726 pack->SkipPixels += (0 - *srcX);
1727 *width -= (0 - *srcX);
1728 *srcX = 0;
1729 }
1730 /* right clipping */
1731 if (*srcX + *width > (GLsizei) buffer->Width)
1732 *width -= (*srcX + *width - buffer->Width);
1733
1734 if (*width <= 0)
1735 return GL_FALSE;
1736
1737 /* bottom clipping */
1738 if (*srcY < 0) {
1739 pack->SkipRows += (0 - *srcY);
1740 *height -= (0 - *srcY);
1741 *srcY = 0;
1742 }
1743 /* top clipping */
1744 if (*srcY + *height > (GLsizei) buffer->Height)
1745 *height -= (*srcY + *height - buffer->Height);
1746
1747 if (*height <= 0)
1748 return GL_FALSE;
1749
1750 return GL_TRUE;
1751 }
1752
1753
1754 /**
1755 * Do clipping for a glCopyTexSubImage call.
1756 * The framebuffer source region might extend outside the framebuffer
1757 * bounds. Clip the source region against the framebuffer bounds and
1758 * adjust the texture/dest position and size accordingly.
1759 *
1760 * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
1761 */
1762 GLboolean
1763 _mesa_clip_copytexsubimage(const struct gl_context *ctx,
1764 GLint *destX, GLint *destY,
1765 GLint *srcX, GLint *srcY,
1766 GLsizei *width, GLsizei *height)
1767 {
1768 const struct gl_framebuffer *fb = ctx->ReadBuffer;
1769 const GLint srcX0 = *srcX, srcY0 = *srcY;
1770
1771 if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,
1772 srcX, srcY, width, height)) {
1773 *destX = *destX + *srcX - srcX0;
1774 *destY = *destY + *srcY - srcY0;
1775
1776 return GL_TRUE;
1777 }
1778 else {
1779 return GL_FALSE;
1780 }
1781 }
1782
1783
1784
1785 /**
1786 * Clip the rectangle defined by (x, y, width, height) against the bounds
1787 * specified by [xmin, xmax) and [ymin, ymax).
1788 * \return GL_FALSE if rect is totally clipped, GL_TRUE otherwise.
1789 */
1790 GLboolean
1791 _mesa_clip_to_region(GLint xmin, GLint ymin,
1792 GLint xmax, GLint ymax,
1793 GLint *x, GLint *y,
1794 GLsizei *width, GLsizei *height )
1795 {
1796 /* left clipping */
1797 if (*x < xmin) {
1798 *width -= (xmin - *x);
1799 *x = xmin;
1800 }
1801
1802 /* right clipping */
1803 if (*x + *width > xmax)
1804 *width -= (*x + *width - xmax);
1805
1806 if (*width <= 0)
1807 return GL_FALSE;
1808
1809 /* bottom (or top) clipping */
1810 if (*y < ymin) {
1811 *height -= (ymin - *y);
1812 *y = ymin;
1813 }
1814
1815 /* top (or bottom) clipping */
1816 if (*y + *height > ymax)
1817 *height -= (*y + *height - ymax);
1818
1819 if (*height <= 0)
1820 return GL_FALSE;
1821
1822 return GL_TRUE;
1823 }
1824
1825
1826 /**
1827 * Clip dst coords against Xmax (or Ymax).
1828 */
1829 static inline void
1830 clip_right_or_top(GLint *srcX0, GLint *srcX1,
1831 GLint *dstX0, GLint *dstX1,
1832 GLint maxValue)
1833 {
1834 GLfloat t, bias;
1835
1836 if (*dstX1 > maxValue) {
1837 /* X1 outside right edge */
1838 ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */
1839 t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1840 /* chop off [t, 1] part */
1841 ASSERT(t >= 0.0 && t <= 1.0);
1842 *dstX1 = maxValue;
1843 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1844 *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1845 }
1846 else if (*dstX0 > maxValue) {
1847 /* X0 outside right edge */
1848 ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */
1849 t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1850 /* chop off [t, 1] part */
1851 ASSERT(t >= 0.0 && t <= 1.0);
1852 *dstX0 = maxValue;
1853 bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;
1854 *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1855 }
1856 }
1857
1858
1859 /**
1860 * Clip dst coords against Xmin (or Ymin).
1861 */
1862 static inline void
1863 clip_left_or_bottom(GLint *srcX0, GLint *srcX1,
1864 GLint *dstX0, GLint *dstX1,
1865 GLint minValue)
1866 {
1867 GLfloat t, bias;
1868
1869 if (*dstX0 < minValue) {
1870 /* X0 outside left edge */
1871 ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */
1872 t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
1873 /* chop off [0, t] part */
1874 ASSERT(t >= 0.0 && t <= 1.0);
1875 *dstX0 = minValue;
1876 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */
1877 *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
1878 }
1879 else if (*dstX1 < minValue) {
1880 /* X1 outside left edge */
1881 ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */
1882 t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
1883 /* chop off [0, t] part */
1884 ASSERT(t >= 0.0 && t <= 1.0);
1885 *dstX1 = minValue;
1886 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1887 *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1888 }
1889 }
1890
1891
1892 /**
1893 * Do clipping of blit src/dest rectangles.
1894 * The dest rect is clipped against both the buffer bounds and scissor bounds.
1895 * The src rect is just clipped against the buffer bounds.
1896 *
1897 * When either the src or dest rect is clipped, the other is also clipped
1898 * proportionately!
1899 *
1900 * Note that X0 need not be less than X1 (same for Y) for either the source
1901 * and dest rects. That makes the clipping a little trickier.
1902 *
1903 * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped
1904 */
1905 GLboolean
1906 _mesa_clip_blit(struct gl_context *ctx,
1907 GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1,
1908 GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1)
1909 {
1910 const GLint srcXmin = 0;
1911 const GLint srcXmax = ctx->ReadBuffer->Width;
1912 const GLint srcYmin = 0;
1913 const GLint srcYmax = ctx->ReadBuffer->Height;
1914
1915 /* these include scissor bounds */
1916 const GLint dstXmin = ctx->DrawBuffer->_Xmin;
1917 const GLint dstXmax = ctx->DrawBuffer->_Xmax;
1918 const GLint dstYmin = ctx->DrawBuffer->_Ymin;
1919 const GLint dstYmax = ctx->DrawBuffer->_Ymax;
1920
1921 /*
1922 printf("PreClipX: src: %d .. %d dst: %d .. %d\n",
1923 *srcX0, *srcX1, *dstX0, *dstX1);
1924 printf("PreClipY: src: %d .. %d dst: %d .. %d\n",
1925 *srcY0, *srcY1, *dstY0, *dstY1);
1926 */
1927
1928 /* trivial rejection tests */
1929 if (*dstX0 == *dstX1)
1930 return GL_FALSE; /* no width */
1931 if (*dstX0 <= dstXmin && *dstX1 <= dstXmin)
1932 return GL_FALSE; /* totally out (left) of bounds */
1933 if (*dstX0 >= dstXmax && *dstX1 >= dstXmax)
1934 return GL_FALSE; /* totally out (right) of bounds */
1935
1936 if (*dstY0 == *dstY1)
1937 return GL_FALSE;
1938 if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)
1939 return GL_FALSE;
1940 if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)
1941 return GL_FALSE;
1942
1943 if (*srcX0 == *srcX1)
1944 return GL_FALSE;
1945 if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)
1946 return GL_FALSE;
1947 if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)
1948 return GL_FALSE;
1949
1950 if (*srcY0 == *srcY1)
1951 return GL_FALSE;
1952 if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)
1953 return GL_FALSE;
1954 if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)
1955 return GL_FALSE;
1956
1957 /*
1958 * dest clip
1959 */
1960 clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax);
1961 clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax);
1962 clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin);
1963 clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin);
1964
1965 /*
1966 * src clip (just swap src/dst values from above)
1967 */
1968 clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax);
1969 clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax);
1970 clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin);
1971 clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin);
1972
1973 /*
1974 printf("PostClipX: src: %d .. %d dst: %d .. %d\n",
1975 *srcX0, *srcX1, *dstX0, *dstX1);
1976 printf("PostClipY: src: %d .. %d dst: %d .. %d\n",
1977 *srcY0, *srcY1, *dstY0, *dstY1);
1978 */
1979
1980 ASSERT(*dstX0 >= dstXmin);
1981 ASSERT(*dstX0 <= dstXmax);
1982 ASSERT(*dstX1 >= dstXmin);
1983 ASSERT(*dstX1 <= dstXmax);
1984
1985 ASSERT(*dstY0 >= dstYmin);
1986 ASSERT(*dstY0 <= dstYmax);
1987 ASSERT(*dstY1 >= dstYmin);
1988 ASSERT(*dstY1 <= dstYmax);
1989
1990 ASSERT(*srcX0 >= srcXmin);
1991 ASSERT(*srcX0 <= srcXmax);
1992 ASSERT(*srcX1 >= srcXmin);
1993 ASSERT(*srcX1 <= srcXmax);
1994
1995 ASSERT(*srcY0 >= srcYmin);
1996 ASSERT(*srcY0 <= srcYmax);
1997 ASSERT(*srcY1 >= srcYmin);
1998 ASSERT(*srcY1 <= srcYmax);
1999
2000 return GL_TRUE;
2001 }