2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
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:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
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.
38 #include "mfeatures.h"
44 * \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.
47 _mesa_type_is_packed(GLenum 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:
78 * Flip the order of the 2 bytes in each word in the given array.
81 * \param n number of words.
84 _mesa_swap2( GLushort *p, GLuint n )
87 for (i = 0; i < n; i++) {
88 p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
95 * Flip the order of the 4 bytes in each word in the given array.
98 _mesa_swap4( GLuint *p, GLuint n )
101 for (i = 0; i < n; i++) {
104 | ((b >> 8) & 0xff00)
105 | ((b << 8) & 0xff0000)
106 | ((b << 24) & 0xff000000);
113 * Get the size of a GL data type.
115 * \param type GL data type.
117 * \return the size, in bytes, of the given data type, 0 if a GL_BITMAP, or -1
118 * if an invalid type enum.
121 _mesa_sizeof_type( GLenum type )
126 case GL_UNSIGNED_BYTE:
127 return sizeof(GLubyte);
129 return sizeof(GLbyte);
130 case GL_UNSIGNED_SHORT:
131 return sizeof(GLushort);
133 return sizeof(GLshort);
134 case GL_UNSIGNED_INT:
135 return sizeof(GLuint);
137 return sizeof(GLint);
139 return sizeof(GLfloat);
141 return sizeof(GLdouble);
142 case GL_HALF_FLOAT_ARB:
143 return sizeof(GLhalfARB);
145 return sizeof(GLfixed);
153 * Same as _mesa_sizeof_type() but also accepting the packed pixel
157 _mesa_sizeof_packed_type( GLenum type )
162 case GL_UNSIGNED_BYTE:
163 return sizeof(GLubyte);
165 return sizeof(GLbyte);
166 case GL_UNSIGNED_SHORT:
167 return sizeof(GLushort);
169 return sizeof(GLshort);
170 case GL_UNSIGNED_INT:
171 return sizeof(GLuint);
173 return sizeof(GLint);
174 case GL_HALF_FLOAT_ARB:
175 return sizeof(GLhalfARB);
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:
208 * Get the number of components in a pixel format.
210 * \param format pixel format.
212 * \return the number of components in the given format, or -1 if a bad format.
215 _mesa_components_in_format( GLenum format )
219 case GL_STENCIL_INDEX:
220 case GL_DEPTH_COMPONENT:
222 case GL_RED_INTEGER_EXT:
224 case GL_GREEN_INTEGER_EXT:
226 case GL_BLUE_INTEGER_EXT:
228 case GL_ALPHA_INTEGER_EXT:
230 case GL_LUMINANCE_INTEGER_EXT:
234 case GL_LUMINANCE_ALPHA:
235 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
238 case GL_DEPTH_STENCIL_EXT:
246 case GL_RGB_INTEGER_EXT:
247 case GL_BGR_INTEGER_EXT:
253 case GL_RGBA_INTEGER_EXT:
254 case GL_BGRA_INTEGER_EXT:
264 * Get the bytes per pixel of pixel format type pair.
266 * \param format pixel format.
267 * \param type pixel type.
269 * \return bytes per pixel, or -1 if a bad format or type was given.
272 _mesa_bytes_per_pixel( GLenum format, GLenum type )
274 GLint comps = _mesa_components_in_format( format );
280 return 0; /* special case */
282 case GL_UNSIGNED_BYTE:
283 return comps * sizeof(GLubyte);
285 case GL_UNSIGNED_SHORT:
286 return comps * sizeof(GLshort);
288 case GL_UNSIGNED_INT:
289 return comps * sizeof(GLint);
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);
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);
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);
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);
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);
332 case GL_UNSIGNED_INT_24_8_EXT:
333 if (format == GL_DEPTH_STENCIL_EXT)
334 return sizeof(GLuint);
337 case GL_UNSIGNED_INT_5_9_9_9_REV:
338 if (format == GL_RGB)
339 return sizeof(GLuint);
342 case GL_UNSIGNED_INT_10F_11F_11F_REV:
343 if (format == GL_RGB)
344 return sizeof(GLuint);
347 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
348 if (format == GL_DEPTH_STENCIL)
359 * Test for a legal pixel format and type.
361 * \param format pixel format.
362 * \param type pixel type.
364 * \return GL_TRUE if the given pixel format and type are legal, or GL_FALSE
368 _mesa_is_legal_format_and_type(const struct gl_context *ctx,
369 GLenum format, GLenum type)
373 case GL_STENCIL_INDEX:
377 case GL_UNSIGNED_BYTE:
379 case GL_UNSIGNED_SHORT:
381 case GL_UNSIGNED_INT:
384 case GL_HALF_FLOAT_ARB:
385 return ctx->Extensions.ARB_half_float_pixel;
393 #if 0 /* not legal! see table 3.6 of the 1.5 spec */
397 case GL_LUMINANCE_ALPHA:
398 case GL_DEPTH_COMPONENT:
401 case GL_UNSIGNED_BYTE:
403 case GL_UNSIGNED_SHORT:
405 case GL_UNSIGNED_INT:
408 case GL_HALF_FLOAT_ARB:
409 return ctx->Extensions.ARB_half_float_pixel;
414 if (!ctx->Extensions.ARB_texture_rg)
419 case GL_UNSIGNED_BYTE:
421 case GL_UNSIGNED_SHORT:
423 case GL_UNSIGNED_INT:
426 case GL_HALF_FLOAT_ARB:
427 return ctx->Extensions.ARB_half_float_pixel;
434 case GL_UNSIGNED_BYTE:
436 case GL_UNSIGNED_SHORT:
438 case GL_UNSIGNED_INT:
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:
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;
456 /* NOTE: no packed types are supported with BGR. That's
457 * intentional, according to the GL spec.
460 case GL_UNSIGNED_BYTE:
462 case GL_UNSIGNED_SHORT:
464 case GL_UNSIGNED_INT:
467 case GL_HALF_FLOAT_ARB:
468 return ctx->Extensions.ARB_half_float_pixel;
477 case GL_UNSIGNED_BYTE:
479 case GL_UNSIGNED_SHORT:
481 case GL_UNSIGNED_INT:
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:
492 case GL_HALF_FLOAT_ARB:
493 return ctx->Extensions.ARB_half_float_pixel;
498 if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
499 type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
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))
515 case GL_UNSIGNED_BYTE:
517 case GL_UNSIGNED_SHORT:
519 case GL_UNSIGNED_INT:
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:
534 case GL_UNSIGNED_BYTE:
536 case GL_UNSIGNED_SHORT:
538 case GL_UNSIGNED_INT:
539 return ctx->Extensions.EXT_texture_integer;
544 case GL_RGB_INTEGER_EXT:
547 case GL_UNSIGNED_BYTE:
549 case GL_UNSIGNED_SHORT:
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;
562 case GL_BGR_INTEGER_EXT:
565 case GL_UNSIGNED_BYTE:
567 case GL_UNSIGNED_SHORT:
569 case GL_UNSIGNED_INT:
570 /* NOTE: no packed formats w/ BGR format */
571 return ctx->Extensions.EXT_texture_integer;
576 case GL_RGBA_INTEGER_EXT:
577 case GL_BGRA_INTEGER_EXT:
580 case GL_UNSIGNED_BYTE:
582 case GL_UNSIGNED_SHORT:
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;
599 case GL_LUMINANCE_INTEGER_EXT:
600 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
603 case GL_UNSIGNED_BYTE:
605 case GL_UNSIGNED_SHORT:
607 case GL_UNSIGNED_INT:
608 return ctx->Extensions.EXT_texture_integer;
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.
627 _mesa_is_color_format(GLenum format)
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:
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:
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:
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
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:
757 case GL_LUMINANCE_INTEGER_EXT:
758 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
759 /* sized integer formats */
760 case GL_RGBA32UI_EXT:
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:
772 case GL_ALPHA16UI_EXT:
773 case GL_INTENSITY16UI_EXT:
774 case GL_LUMINANCE16UI_EXT:
775 case GL_LUMINANCE_ALPHA16UI_EXT:
780 case GL_ALPHA8UI_EXT:
781 case GL_INTENSITY8UI_EXT:
782 case GL_LUMINANCE8UI_EXT:
783 case GL_LUMINANCE_ALPHA8UI_EXT:
788 case GL_ALPHA32I_EXT:
789 case GL_INTENSITY32I_EXT:
790 case GL_LUMINANCE32I_EXT:
791 case GL_LUMINANCE_ALPHA32I_EXT:
796 case GL_ALPHA16I_EXT:
797 case GL_INTENSITY16I_EXT:
798 case GL_LUMINANCE16I_EXT:
799 case GL_LUMINANCE_ALPHA16I_EXT:
805 case GL_INTENSITY8I_EXT:
806 case GL_LUMINANCE8I_EXT:
807 case GL_LUMINANCE_ALPHA8I_EXT:
808 /* signed, normalized texture formats */
820 case GL_RGBA16_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:
834 case GL_R11F_G11F_B10F:
837 case GL_YCBCR_MESA: /* not considered to be RGB */
846 * Test if the given image format is a depth component format.
849 _mesa_is_depth_format(GLenum 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:
865 * Test if the given image format is a stencil format.
868 _mesa_is_stencil_format(GLenum format)
871 case GL_STENCIL_INDEX:
880 * Test if the given image format is a YCbCr format.
883 _mesa_is_ycbcr_format(GLenum format)
895 * Test if the given image format is a depth+stencil format.
898 _mesa_is_depthstencil_format(GLenum format)
901 case GL_DEPTH24_STENCIL8_EXT:
902 case GL_DEPTH_STENCIL_EXT:
903 case GL_DEPTH32F_STENCIL8:
912 * Test if the given image format is a depth or stencil format.
915 _mesa_is_depth_or_stencil_format(GLenum 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:
939 * Test if the given image format is a dudv format.
942 _mesa_is_dudv_format(GLenum format)
955 * Test if the given format is an integer (non-normalized) format.
958 _mesa_is_integer_format(GLenum 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:
973 /* specific integer formats */
974 case GL_RGBA32UI_EXT:
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:
986 case GL_ALPHA16UI_EXT:
987 case GL_INTENSITY16UI_EXT:
988 case GL_LUMINANCE16UI_EXT:
989 case GL_LUMINANCE_ALPHA16UI_EXT:
994 case GL_ALPHA8UI_EXT:
995 case GL_INTENSITY8UI_EXT:
996 case GL_LUMINANCE8UI_EXT:
997 case GL_LUMINANCE_ALPHA8UI_EXT:
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:
1010 case GL_ALPHA16I_EXT:
1011 case GL_INTENSITY16I_EXT:
1012 case GL_LUMINANCE16I_EXT:
1013 case GL_LUMINANCE_ALPHA16I_EXT:
1018 case GL_ALPHA8I_EXT:
1019 case GL_INTENSITY8I_EXT:
1020 case GL_LUMINANCE8I_EXT:
1021 case GL_LUMINANCE_ALPHA8I_EXT:
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
1036 _mesa_is_compressed_format(struct gl_context *ctx, GLenum 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;
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;
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;
1092 * Does the given base texture/renderbuffer format have the channel
1096 _mesa_base_format_has_channel(GLenum base_format, GLenum 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) {
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) {
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) {
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) {
1139 case GL_TEXTURE_LUMINANCE_SIZE:
1140 case GL_TEXTURE_LUMINANCE_TYPE:
1141 if (base_format == GL_LUMINANCE ||
1142 base_format == GL_LUMINANCE_ALPHA) {
1146 case GL_TEXTURE_INTENSITY_SIZE:
1147 case GL_TEXTURE_INTENSITY_TYPE:
1148 if (base_format == GL_INTENSITY) {
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) {
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) {
1169 _mesa_warning(NULL, "%s: Unexpected channel token 0x%x\n",
1170 __FUNCTION__, pname);
1179 * Return the byte offset of a specific pixel in an image (1D, 2D or 3D).
1181 * Pixel unpacking/packing parameters are observed according to \p packing.
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
1193 * \return offset of pixel.
1195 * \sa gl_pixelstore_attrib.
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 )
1204 GLint alignment; /* 1, 2 or 4 */
1205 GLint pixels_per_row;
1206 GLint rows_per_image;
1209 GLint skipimages; /* for 3-D volume images */
1212 ASSERT(dimensions >= 1 && dimensions <= 3);
1214 alignment = packing->Alignment;
1215 if (packing->RowLength > 0) {
1216 pixels_per_row = packing->RowLength;
1219 pixels_per_row = width;
1221 if (packing->ImageHeight > 0) {
1222 rows_per_image = packing->ImageHeight;
1225 rows_per_image = height;
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;
1234 if (type == GL_BITMAP) {
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;
1241 /* The pixel type and format should have been error checked earlier */
1242 assert(format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX);
1244 bytes_per_row = alignment
1245 * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
1247 bytes_per_image = bytes_per_row * rows_per_image;
1249 offset = (skipimages + img) * bytes_per_image
1250 + (skiprows + row) * bytes_per_row
1251 + (skippixels + column) / 8;
1254 /* Non-BITMAP data */
1255 GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
1258 bytes_per_pixel = _mesa_bytes_per_pixel( format, type );
1260 /* The pixel type and format should have been error checked earlier */
1261 assert(bytes_per_pixel > 0);
1263 bytes_per_row = pixels_per_row * bytes_per_pixel;
1264 remainder = bytes_per_row % alignment;
1266 bytes_per_row += (alignment - remainder);
1268 ASSERT(bytes_per_row % alignment == 0);
1270 bytes_per_image = bytes_per_row * rows_per_image;
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;
1281 /* compute final pixel address */
1282 offset = (skipimages + img) * bytes_per_image
1284 + (skiprows + row) * bytes_per_row
1285 + (skippixels + column) * bytes_per_pixel;
1293 * Return the address of a specific pixel in an image (1D, 2D or 3D).
1295 * Pixel unpacking/packing parameters are observed according to \p packing.
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
1308 * \return address of pixel.
1310 * \sa gl_pixelstore_attrib.
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 )
1320 const GLubyte *addr = (const GLubyte *) image;
1322 addr += _mesa_image_offset(dimensions, packing, width, height,
1323 format, type, img, row, column);
1325 return (GLvoid *) addr;
1330 _mesa_image_address1d( const struct gl_pixelstore_attrib *packing,
1331 const GLvoid *image,
1333 GLenum format, GLenum type,
1336 return _mesa_image_address(1, packing, image, width, 1,
1337 format, type, 0, 0, column);
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 )
1348 return _mesa_image_address(2, packing, image, width, height,
1349 format, type, 0, row, column);
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 )
1360 return _mesa_image_address(3, packing, image, width, height,
1361 format, type, img, row, column);
1367 * Compute the stride (in bytes) between image rows.
1369 * \param packing the pixelstore attributes
1370 * \param width image width.
1371 * \param format pixel format.
1372 * \param type pixel data type.
1374 * \return the stride in bytes for the given parameters, or -1 if error
1377 _mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
1378 GLint width, GLenum format, GLenum type )
1380 GLint bytesPerRow, remainder;
1384 if (type == GL_BITMAP) {
1385 if (packing->RowLength == 0) {
1386 bytesPerRow = (width + 7) / 8;
1389 bytesPerRow = (packing->RowLength + 7) / 8;
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;
1401 bytesPerRow = bytesPerPixel * packing->RowLength;
1405 remainder = bytesPerRow % packing->Alignment;
1406 if (remainder > 0) {
1407 bytesPerRow += (packing->Alignment - remainder);
1410 if (packing->Invert) {
1411 /* negate the bytes per row (negative row stride) */
1412 bytesPerRow = -bytesPerRow;
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.
1424 _mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
1425 GLint width, GLint height,
1426 GLenum format, GLenum type )
1428 GLint bytesPerRow, bytesPerImage, remainder;
1432 if (type == GL_BITMAP) {
1433 if (packing->RowLength == 0) {
1434 bytesPerRow = (width + 7) / 8;
1437 bytesPerRow = (packing->RowLength + 7) / 8;
1441 const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
1443 if (bytesPerPixel <= 0)
1444 return -1; /* error */
1445 if (packing->RowLength == 0) {
1446 bytesPerRow = bytesPerPixel * width;
1449 bytesPerRow = bytesPerPixel * packing->RowLength;
1453 remainder = bytesPerRow % packing->Alignment;
1455 bytesPerRow += (packing->Alignment - remainder);
1457 if (packing->ImageHeight == 0)
1458 bytesPerImage = bytesPerRow * height;
1460 bytesPerImage = bytesPerRow * packing->ImageHeight;
1462 return bytesPerImage;
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
1481 _mesa_expand_bitmap(GLsizei width, GLsizei height,
1482 const struct gl_pixelstore_attrib *unpack,
1483 const GLubyte *bitmap,
1484 GLubyte *destBuffer, GLint destStride,
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);
1494 #define SET_PIXEL(COL, ROW) \
1495 destBuffer[(ROW) * destStride + (COL)] = onValue;
1497 for (row = 0; row < height; row++) {
1498 const GLubyte *src = srcRow;
1500 if (unpack->LsbFirst) {
1502 GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
1503 for (col = 0; col < width; col++) {
1506 SET_PIXEL(col, row);
1518 /* get ready for next row */
1524 GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
1525 for (col = 0; col < width; col++) {
1528 SET_PIXEL(col, row);
1540 /* get ready for next row */
1545 srcRow += srcStride;
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.
1559 _mesa_convert_colors(GLenum srcType, const GLvoid *src,
1560 GLenum dstType, GLvoid *dst,
1561 GLuint count, const GLubyte mask[])
1564 const GLboolean useTemp = (src == dst);
1566 tempBuffer = malloc(count * MAX_PIXEL_BYTES);
1570 ASSERT(srcType != dstType);
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);
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]);
1587 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1590 const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
1591 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
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]);
1603 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
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);
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]);
1620 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1623 const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
1624 GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
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]);
1636 memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
1640 if (dstType == GL_UNSIGNED_BYTE) {
1641 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1642 GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
1644 for (i = 0; i < count; i++) {
1645 if (!mask || mask[i])
1646 _mesa_unclamped_float_rgba_to_ubyte(dst1[i], src4[i]);
1649 memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
1652 const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
1653 GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
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]);
1665 memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
1669 _mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");
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.
1686 * \return GL_TRUE if image is ready for drawing or
1687 * GL_FALSE if image was completely clipped away (draw nothing)
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)
1695 const struct gl_framebuffer *buffer = ctx->DrawBuffer;
1697 if (unpack->RowLength == 0) {
1698 unpack->RowLength = *width;
1701 ASSERT(ctx->Pixel.ZoomX == 1.0F);
1702 ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);
1705 if (*destX < buffer->_Xmin) {
1706 unpack->SkipPixels += (buffer->_Xmin - *destX);
1707 *width -= (buffer->_Xmin - *destX);
1708 *destX = buffer->_Xmin;
1710 /* right clipping */
1711 if (*destX + *width > buffer->_Xmax)
1712 *width -= (*destX + *width - buffer->_Xmax);
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;
1725 if (*destY + *height > buffer->_Ymax)
1726 *height -= (*destY + *height - buffer->_Ymax);
1728 else { /* upside down */
1730 if (*destY > buffer->_Ymax) {
1731 unpack->SkipRows += (*destY - buffer->_Ymax);
1732 *height -= (*destY - buffer->_Ymax);
1733 *destY = buffer->_Ymax;
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 */
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
1757 * \return GL_TRUE if region to read is in bounds
1758 * GL_FALSE if region is completely out of bounds (nothing to read)
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)
1766 const struct gl_framebuffer *buffer = ctx->ReadBuffer;
1768 if (pack->RowLength == 0) {
1769 pack->RowLength = *width;
1774 pack->SkipPixels += (0 - *srcX);
1775 *width -= (0 - *srcX);
1778 /* right clipping */
1779 if (*srcX + *width > (GLsizei) buffer->Width)
1780 *width -= (*srcX + *width - buffer->Width);
1785 /* bottom clipping */
1787 pack->SkipRows += (0 - *srcY);
1788 *height -= (0 - *srcY);
1792 if (*srcY + *height > (GLsizei) buffer->Height)
1793 *height -= (*srcY + *height - buffer->Height);
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.
1808 * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
1811 _mesa_clip_copytexsubimage(const struct gl_context *ctx,
1812 GLint *destX, GLint *destY,
1813 GLint *srcX, GLint *srcY,
1814 GLsizei *width, GLsizei *height)
1816 const struct gl_framebuffer *fb = ctx->ReadBuffer;
1817 const GLint srcX0 = *srcX, srcY0 = *srcY;
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;
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.
1839 _mesa_clip_to_region(GLint xmin, GLint ymin,
1840 GLint xmax, GLint ymax,
1842 GLsizei *width, GLsizei *height )
1846 *width -= (xmin - *x);
1850 /* right clipping */
1851 if (*x + *width > xmax)
1852 *width -= (*x + *width - xmax);
1857 /* bottom (or top) clipping */
1859 *height -= (ymin - *y);
1863 /* top (or bottom) clipping */
1864 if (*y + *height > ymax)
1865 *height -= (*y + *height - ymax);
1875 * Clip dst coords against Xmax (or Ymax).
1878 clip_right_or_top(GLint *srcX0, GLint *srcX1,
1879 GLint *dstX0, GLint *dstX1,
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);
1891 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1892 *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
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);
1901 bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;
1902 *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
1908 * Clip dst coords against Xmin (or Ymin).
1911 clip_left_or_bottom(GLint *srcX0, GLint *srcX1,
1912 GLint *dstX0, GLint *dstX1,
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);
1924 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */
1925 *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
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);
1934 bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
1935 *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
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.
1945 * When either the src or dest rect is clipped, the other is also clipped
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.
1951 * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped
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)
1958 const GLint srcXmin = 0;
1959 const GLint srcXmax = ctx->ReadBuffer->Width;
1960 const GLint srcYmin = 0;
1961 const GLint srcYmax = ctx->ReadBuffer->Height;
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;
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);
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 */
1984 if (*dstY0 == *dstY1)
1986 if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)
1988 if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)
1991 if (*srcX0 == *srcX1)
1993 if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)
1995 if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)
1998 if (*srcY0 == *srcY1)
2000 if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)
2002 if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)
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);
2014 * src clip (just swap src/dst values from above)
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);
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);
2028 ASSERT(*dstX0 >= dstXmin);
2029 ASSERT(*dstX0 <= dstXmax);
2030 ASSERT(*dstX1 >= dstXmin);
2031 ASSERT(*dstX1 <= dstXmax);
2033 ASSERT(*dstY0 >= dstYmin);
2034 ASSERT(*dstY0 <= dstYmax);
2035 ASSERT(*dstY1 >= dstYmin);
2036 ASSERT(*dstY1 <= dstYmax);
2038 ASSERT(*srcX0 >= srcXmin);
2039 ASSERT(*srcX0 <= srcXmax);
2040 ASSERT(*srcX1 >= srcXmin);
2041 ASSERT(*srcX1 <= srcXmax);
2043 ASSERT(*srcY0 >= srcYmin);
2044 ASSERT(*srcY0 <= srcYmax);
2045 ASSERT(*srcY1 >= srcYmin);
2046 ASSERT(*srcY1 <= srcYmax);