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Merge branch '7.8'
[mesa.git] / src / mesa / swrast / s_texfilter.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.3
4 *
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26 #include "main/glheader.h"
27 #include "main/context.h"
28 #include "main/colormac.h"
29 #include "main/imports.h"
30 #include "main/texformat.h"
31
32 #include "s_context.h"
33 #include "s_texfilter.h"
34
35
36 /*
37 * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
38 * see 1-pixel bands of improperly weighted linear-filtered textures.
39 * The tests/texwrap.c demo is a good test.
40 * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
41 * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
42 */
43 #define FRAC(f) ((f) - IFLOOR(f))
44
45
46
47 /**
48 * Linear interpolation macro
49 */
50 #define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) )
51
52
53 /**
54 * Do 2D/biliner interpolation of float values.
55 * v00, v10, v01 and v11 are typically four texture samples in a square/box.
56 * a and b are the horizontal and vertical interpolants.
57 * It's important that this function is inlined when compiled with
58 * optimization! If we find that's not true on some systems, convert
59 * to a macro.
60 */
61 static INLINE GLfloat
62 lerp_2d(GLfloat a, GLfloat b,
63 GLfloat v00, GLfloat v10, GLfloat v01, GLfloat v11)
64 {
65 const GLfloat temp0 = LERP(a, v00, v10);
66 const GLfloat temp1 = LERP(a, v01, v11);
67 return LERP(b, temp0, temp1);
68 }
69
70
71 /**
72 * Do 3D/trilinear interpolation of float values.
73 * \sa lerp_2d
74 */
75 static INLINE GLfloat
76 lerp_3d(GLfloat a, GLfloat b, GLfloat c,
77 GLfloat v000, GLfloat v100, GLfloat v010, GLfloat v110,
78 GLfloat v001, GLfloat v101, GLfloat v011, GLfloat v111)
79 {
80 const GLfloat temp00 = LERP(a, v000, v100);
81 const GLfloat temp10 = LERP(a, v010, v110);
82 const GLfloat temp01 = LERP(a, v001, v101);
83 const GLfloat temp11 = LERP(a, v011, v111);
84 const GLfloat temp0 = LERP(b, temp00, temp10);
85 const GLfloat temp1 = LERP(b, temp01, temp11);
86 return LERP(c, temp0, temp1);
87 }
88
89
90 /**
91 * Do linear interpolation of colors.
92 */
93 static INLINE void
94 lerp_rgba(GLfloat result[4], GLfloat t, const GLfloat a[4], const GLfloat b[4])
95 {
96 result[0] = LERP(t, a[0], b[0]);
97 result[1] = LERP(t, a[1], b[1]);
98 result[2] = LERP(t, a[2], b[2]);
99 result[3] = LERP(t, a[3], b[3]);
100 }
101
102
103 /**
104 * Do bilinear interpolation of colors.
105 */
106 static INLINE void
107 lerp_rgba_2d(GLfloat result[4], GLfloat a, GLfloat b,
108 const GLfloat t00[4], const GLfloat t10[4],
109 const GLfloat t01[4], const GLfloat t11[4])
110 {
111 result[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
112 result[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
113 result[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
114 result[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
115 }
116
117
118 /**
119 * Do trilinear interpolation of colors.
120 */
121 static INLINE void
122 lerp_rgba_3d(GLfloat result[4], GLfloat a, GLfloat b, GLfloat c,
123 const GLfloat t000[4], const GLfloat t100[4],
124 const GLfloat t010[4], const GLfloat t110[4],
125 const GLfloat t001[4], const GLfloat t101[4],
126 const GLfloat t011[4], const GLfloat t111[4])
127 {
128 GLuint k;
129 /* compiler should unroll these short loops */
130 for (k = 0; k < 4; k++) {
131 result[k] = lerp_3d(a, b, c, t000[k], t100[k], t010[k], t110[k],
132 t001[k], t101[k], t011[k], t111[k]);
133 }
134 }
135
136
137 /**
138 * If A is a signed integer, A % B doesn't give the right value for A < 0
139 * (in terms of texture repeat). Just casting to unsigned fixes that.
140 */
141 #define REMAINDER(A, B) (((A) + (B) * 1024) % (B))
142
143
144 /**
145 * Used to compute texel locations for linear sampling.
146 * Input:
147 * wrapMode = GL_REPEAT, GL_CLAMP, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_BORDER
148 * s = texcoord in [0,1]
149 * size = width (or height or depth) of texture
150 * Output:
151 * i0, i1 = returns two nearest texel indexes
152 * weight = returns blend factor between texels
153 */
154 static INLINE void
155 linear_texel_locations(GLenum wrapMode,
156 const struct gl_texture_image *img,
157 GLint size, GLfloat s,
158 GLint *i0, GLint *i1, GLfloat *weight)
159 {
160 GLfloat u;
161 switch (wrapMode) {
162 case GL_REPEAT:
163 u = s * size - 0.5F;
164 if (img->_IsPowerOfTwo) {
165 *i0 = IFLOOR(u) & (size - 1);
166 *i1 = (*i0 + 1) & (size - 1);
167 }
168 else {
169 *i0 = REMAINDER(IFLOOR(u), size);
170 *i1 = REMAINDER(*i0 + 1, size);
171 }
172 break;
173 case GL_CLAMP_TO_EDGE:
174 if (s <= 0.0F)
175 u = 0.0F;
176 else if (s >= 1.0F)
177 u = (GLfloat) size;
178 else
179 u = s * size;
180 u -= 0.5F;
181 *i0 = IFLOOR(u);
182 *i1 = *i0 + 1;
183 if (*i0 < 0)
184 *i0 = 0;
185 if (*i1 >= (GLint) size)
186 *i1 = size - 1;
187 break;
188 case GL_CLAMP_TO_BORDER:
189 {
190 const GLfloat min = -1.0F / (2.0F * size);
191 const GLfloat max = 1.0F - min;
192 if (s <= min)
193 u = min * size;
194 else if (s >= max)
195 u = max * size;
196 else
197 u = s * size;
198 u -= 0.5F;
199 *i0 = IFLOOR(u);
200 *i1 = *i0 + 1;
201 }
202 break;
203 case GL_MIRRORED_REPEAT:
204 {
205 const GLint flr = IFLOOR(s);
206 if (flr & 1)
207 u = 1.0F - (s - (GLfloat) flr);
208 else
209 u = s - (GLfloat) flr;
210 u = (u * size) - 0.5F;
211 *i0 = IFLOOR(u);
212 *i1 = *i0 + 1;
213 if (*i0 < 0)
214 *i0 = 0;
215 if (*i1 >= (GLint) size)
216 *i1 = size - 1;
217 }
218 break;
219 case GL_MIRROR_CLAMP_EXT:
220 u = FABSF(s);
221 if (u >= 1.0F)
222 u = (GLfloat) size;
223 else
224 u *= size;
225 u -= 0.5F;
226 *i0 = IFLOOR(u);
227 *i1 = *i0 + 1;
228 break;
229 case GL_MIRROR_CLAMP_TO_EDGE_EXT:
230 u = FABSF(s);
231 if (u >= 1.0F)
232 u = (GLfloat) size;
233 else
234 u *= size;
235 u -= 0.5F;
236 *i0 = IFLOOR(u);
237 *i1 = *i0 + 1;
238 if (*i0 < 0)
239 *i0 = 0;
240 if (*i1 >= (GLint) size)
241 *i1 = size - 1;
242 break;
243 case GL_MIRROR_CLAMP_TO_BORDER_EXT:
244 {
245 const GLfloat min = -1.0F / (2.0F * size);
246 const GLfloat max = 1.0F - min;
247 u = FABSF(s);
248 if (u <= min)
249 u = min * size;
250 else if (u >= max)
251 u = max * size;
252 else
253 u *= size;
254 u -= 0.5F;
255 *i0 = IFLOOR(u);
256 *i1 = *i0 + 1;
257 }
258 break;
259 case GL_CLAMP:
260 if (s <= 0.0F)
261 u = 0.0F;
262 else if (s >= 1.0F)
263 u = (GLfloat) size;
264 else
265 u = s * size;
266 u -= 0.5F;
267 *i0 = IFLOOR(u);
268 *i1 = *i0 + 1;
269 break;
270 default:
271 _mesa_problem(NULL, "Bad wrap mode");
272 u = 0.0F;
273 }
274 *weight = FRAC(u);
275 }
276
277
278 /**
279 * Used to compute texel location for nearest sampling.
280 */
281 static INLINE GLint
282 nearest_texel_location(GLenum wrapMode,
283 const struct gl_texture_image *img,
284 GLint size, GLfloat s)
285 {
286 GLint i;
287
288 switch (wrapMode) {
289 case GL_REPEAT:
290 /* s limited to [0,1) */
291 /* i limited to [0,size-1] */
292 i = IFLOOR(s * size);
293 if (img->_IsPowerOfTwo)
294 i &= (size - 1);
295 else
296 i = REMAINDER(i, size);
297 return i;
298 case GL_CLAMP_TO_EDGE:
299 {
300 /* s limited to [min,max] */
301 /* i limited to [0, size-1] */
302 const GLfloat min = 1.0F / (2.0F * size);
303 const GLfloat max = 1.0F - min;
304 if (s < min)
305 i = 0;
306 else if (s > max)
307 i = size - 1;
308 else
309 i = IFLOOR(s * size);
310 }
311 return i;
312 case GL_CLAMP_TO_BORDER:
313 {
314 /* s limited to [min,max] */
315 /* i limited to [-1, size] */
316 const GLfloat min = -1.0F / (2.0F * size);
317 const GLfloat max = 1.0F - min;
318 if (s <= min)
319 i = -1;
320 else if (s >= max)
321 i = size;
322 else
323 i = IFLOOR(s * size);
324 }
325 return i;
326 case GL_MIRRORED_REPEAT:
327 {
328 const GLfloat min = 1.0F / (2.0F * size);
329 const GLfloat max = 1.0F - min;
330 const GLint flr = IFLOOR(s);
331 GLfloat u;
332 if (flr & 1)
333 u = 1.0F - (s - (GLfloat) flr);
334 else
335 u = s - (GLfloat) flr;
336 if (u < min)
337 i = 0;
338 else if (u > max)
339 i = size - 1;
340 else
341 i = IFLOOR(u * size);
342 }
343 return i;
344 case GL_MIRROR_CLAMP_EXT:
345 {
346 /* s limited to [0,1] */
347 /* i limited to [0,size-1] */
348 const GLfloat u = FABSF(s);
349 if (u <= 0.0F)
350 i = 0;
351 else if (u >= 1.0F)
352 i = size - 1;
353 else
354 i = IFLOOR(u * size);
355 }
356 return i;
357 case GL_MIRROR_CLAMP_TO_EDGE_EXT:
358 {
359 /* s limited to [min,max] */
360 /* i limited to [0, size-1] */
361 const GLfloat min = 1.0F / (2.0F * size);
362 const GLfloat max = 1.0F - min;
363 const GLfloat u = FABSF(s);
364 if (u < min)
365 i = 0;
366 else if (u > max)
367 i = size - 1;
368 else
369 i = IFLOOR(u * size);
370 }
371 return i;
372 case GL_MIRROR_CLAMP_TO_BORDER_EXT:
373 {
374 /* s limited to [min,max] */
375 /* i limited to [0, size-1] */
376 const GLfloat min = -1.0F / (2.0F * size);
377 const GLfloat max = 1.0F - min;
378 const GLfloat u = FABSF(s);
379 if (u < min)
380 i = -1;
381 else if (u > max)
382 i = size;
383 else
384 i = IFLOOR(u * size);
385 }
386 return i;
387 case GL_CLAMP:
388 /* s limited to [0,1] */
389 /* i limited to [0,size-1] */
390 if (s <= 0.0F)
391 i = 0;
392 else if (s >= 1.0F)
393 i = size - 1;
394 else
395 i = IFLOOR(s * size);
396 return i;
397 default:
398 _mesa_problem(NULL, "Bad wrap mode");
399 return 0;
400 }
401 }
402
403
404 /* Power of two image sizes only */
405 static INLINE void
406 linear_repeat_texel_location(GLuint size, GLfloat s,
407 GLint *i0, GLint *i1, GLfloat *weight)
408 {
409 GLfloat u = s * size - 0.5F;
410 *i0 = IFLOOR(u) & (size - 1);
411 *i1 = (*i0 + 1) & (size - 1);
412 *weight = FRAC(u);
413 }
414
415
416 /**
417 * Do clamp/wrap for a texture rectangle coord, GL_NEAREST filter mode.
418 */
419 static INLINE GLint
420 clamp_rect_coord_nearest(GLenum wrapMode, GLfloat coord, GLint max)
421 {
422 switch (wrapMode) {
423 case GL_CLAMP:
424 return IFLOOR( CLAMP(coord, 0.0F, max - 1) );
425 case GL_CLAMP_TO_EDGE:
426 return IFLOOR( CLAMP(coord, 0.5F, max - 0.5F) );
427 case GL_CLAMP_TO_BORDER:
428 return IFLOOR( CLAMP(coord, -0.5F, max + 0.5F) );
429 default:
430 _mesa_problem(NULL, "bad wrapMode in clamp_rect_coord_nearest");
431 return 0;
432 }
433 }
434
435
436 /**
437 * As above, but GL_LINEAR filtering.
438 */
439 static INLINE void
440 clamp_rect_coord_linear(GLenum wrapMode, GLfloat coord, GLint max,
441 GLint *i0out, GLint *i1out, GLfloat *weight)
442 {
443 GLfloat fcol;
444 GLint i0, i1;
445 switch (wrapMode) {
446 case GL_CLAMP:
447 /* Not exactly what the spec says, but it matches NVIDIA output */
448 fcol = CLAMP(coord - 0.5F, 0.0F, max - 1);
449 i0 = IFLOOR(fcol);
450 i1 = i0 + 1;
451 break;
452 case GL_CLAMP_TO_EDGE:
453 fcol = CLAMP(coord, 0.5F, max - 0.5F);
454 fcol -= 0.5F;
455 i0 = IFLOOR(fcol);
456 i1 = i0 + 1;
457 if (i1 > max - 1)
458 i1 = max - 1;
459 break;
460 case GL_CLAMP_TO_BORDER:
461 fcol = CLAMP(coord, -0.5F, max + 0.5F);
462 fcol -= 0.5F;
463 i0 = IFLOOR(fcol);
464 i1 = i0 + 1;
465 break;
466 default:
467 _mesa_problem(NULL, "bad wrapMode in clamp_rect_coord_linear");
468 i0 = i1 = 0;
469 fcol = 0.0F;
470 }
471 *i0out = i0;
472 *i1out = i1;
473 *weight = FRAC(fcol);
474 }
475
476
477 /**
478 * Compute slice/image to use for 1D or 2D array texture.
479 */
480 static INLINE GLint
481 tex_array_slice(GLfloat coord, GLsizei size)
482 {
483 GLint slice = IFLOOR(coord + 0.5f);
484 slice = CLAMP(slice, 0, size - 1);
485 return slice;
486 }
487
488
489 /**
490 * Compute nearest integer texcoords for given texobj and coordinate.
491 * NOTE: only used for depth texture sampling.
492 */
493 static INLINE void
494 nearest_texcoord(const struct gl_texture_object *texObj,
495 GLuint level,
496 const GLfloat texcoord[4],
497 GLint *i, GLint *j, GLint *k)
498 {
499 const struct gl_texture_image *img = texObj->Image[0][level];
500 const GLint width = img->Width;
501 const GLint height = img->Height;
502 const GLint depth = img->Depth;
503
504 switch (texObj->Target) {
505 case GL_TEXTURE_RECTANGLE_ARB:
506 *i = clamp_rect_coord_nearest(texObj->WrapS, texcoord[0], width);
507 *j = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height);
508 *k = 0;
509 break;
510 case GL_TEXTURE_1D:
511 *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
512 *j = 0;
513 *k = 0;
514 break;
515 case GL_TEXTURE_2D:
516 *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
517 *j = nearest_texel_location(texObj->WrapT, img, height, texcoord[1]);
518 *k = 0;
519 break;
520 case GL_TEXTURE_1D_ARRAY_EXT:
521 *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
522 *j = tex_array_slice(texcoord[1], height);
523 *k = 0;
524 break;
525 case GL_TEXTURE_2D_ARRAY_EXT:
526 *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
527 *j = nearest_texel_location(texObj->WrapT, img, height, texcoord[1]);
528 *k = tex_array_slice(texcoord[2], depth);
529 break;
530 default:
531 *i = *j = *k = 0;
532 }
533 }
534
535
536 /**
537 * Compute linear integer texcoords for given texobj and coordinate.
538 * NOTE: only used for depth texture sampling.
539 */
540 static INLINE void
541 linear_texcoord(const struct gl_texture_object *texObj,
542 GLuint level,
543 const GLfloat texcoord[4],
544 GLint *i0, GLint *i1, GLint *j0, GLint *j1, GLint *slice,
545 GLfloat *wi, GLfloat *wj)
546 {
547 const struct gl_texture_image *img = texObj->Image[0][level];
548 const GLint width = img->Width;
549 const GLint height = img->Height;
550 const GLint depth = img->Depth;
551
552 switch (texObj->Target) {
553 case GL_TEXTURE_RECTANGLE_ARB:
554 clamp_rect_coord_linear(texObj->WrapS, texcoord[0],
555 width, i0, i1, wi);
556 clamp_rect_coord_linear(texObj->WrapT, texcoord[1],
557 height, j0, j1, wj);
558 *slice = 0;
559 break;
560
561 case GL_TEXTURE_1D:
562 case GL_TEXTURE_2D:
563 linear_texel_locations(texObj->WrapS, img, width,
564 texcoord[0], i0, i1, wi);
565 linear_texel_locations(texObj->WrapT, img, height,
566 texcoord[1], j0, j1, wj);
567 *slice = 0;
568 break;
569
570 case GL_TEXTURE_1D_ARRAY_EXT:
571 linear_texel_locations(texObj->WrapS, img, width,
572 texcoord[0], i0, i1, wi);
573 *j0 = tex_array_slice(texcoord[1], height);
574 *j1 = *j0;
575 *slice = 0;
576 break;
577
578 case GL_TEXTURE_2D_ARRAY_EXT:
579 linear_texel_locations(texObj->WrapS, img, width,
580 texcoord[0], i0, i1, wi);
581 linear_texel_locations(texObj->WrapT, img, height,
582 texcoord[1], j0, j1, wj);
583 *slice = tex_array_slice(texcoord[2], depth);
584 break;
585
586 default:
587 *slice = 0;
588 }
589 }
590
591
592
593 /**
594 * For linear interpolation between mipmap levels N and N+1, this function
595 * computes N.
596 */
597 static INLINE GLint
598 linear_mipmap_level(const struct gl_texture_object *tObj, GLfloat lambda)
599 {
600 if (lambda < 0.0F)
601 return tObj->BaseLevel;
602 else if (lambda > tObj->_MaxLambda)
603 return (GLint) (tObj->BaseLevel + tObj->_MaxLambda);
604 else
605 return (GLint) (tObj->BaseLevel + lambda);
606 }
607
608
609 /**
610 * Compute the nearest mipmap level to take texels from.
611 */
612 static INLINE GLint
613 nearest_mipmap_level(const struct gl_texture_object *tObj, GLfloat lambda)
614 {
615 GLfloat l;
616 GLint level;
617 if (lambda <= 0.5F)
618 l = 0.0F;
619 else if (lambda > tObj->_MaxLambda + 0.4999F)
620 l = tObj->_MaxLambda + 0.4999F;
621 else
622 l = lambda;
623 level = (GLint) (tObj->BaseLevel + l + 0.5F);
624 if (level > tObj->_MaxLevel)
625 level = tObj->_MaxLevel;
626 return level;
627 }
628
629
630
631 /*
632 * Bitflags for texture border color sampling.
633 */
634 #define I0BIT 1
635 #define I1BIT 2
636 #define J0BIT 4
637 #define J1BIT 8
638 #define K0BIT 16
639 #define K1BIT 32
640
641
642
643 /**
644 * The lambda[] array values are always monotonic. Either the whole span
645 * will be minified, magnified, or split between the two. This function
646 * determines the subranges in [0, n-1] that are to be minified or magnified.
647 */
648 static INLINE void
649 compute_min_mag_ranges(const struct gl_texture_object *tObj,
650 GLuint n, const GLfloat lambda[],
651 GLuint *minStart, GLuint *minEnd,
652 GLuint *magStart, GLuint *magEnd)
653 {
654 GLfloat minMagThresh;
655
656 /* we shouldn't be here if minfilter == magfilter */
657 ASSERT(tObj->MinFilter != tObj->MagFilter);
658
659 /* This bit comes from the OpenGL spec: */
660 if (tObj->MagFilter == GL_LINEAR
661 && (tObj->MinFilter == GL_NEAREST_MIPMAP_NEAREST ||
662 tObj->MinFilter == GL_NEAREST_MIPMAP_LINEAR)) {
663 minMagThresh = 0.5F;
664 }
665 else {
666 minMagThresh = 0.0F;
667 }
668
669 #if 0
670 /* DEBUG CODE: Verify that lambda[] is monotonic.
671 * We can't really use this because the inaccuracy in the LOG2 function
672 * causes this test to fail, yet the resulting texturing is correct.
673 */
674 if (n > 1) {
675 GLuint i;
676 printf("lambda delta = %g\n", lambda[0] - lambda[n-1]);
677 if (lambda[0] >= lambda[n-1]) { /* decreasing */
678 for (i = 0; i < n - 1; i++) {
679 ASSERT((GLint) (lambda[i] * 10) >= (GLint) (lambda[i+1] * 10));
680 }
681 }
682 else { /* increasing */
683 for (i = 0; i < n - 1; i++) {
684 ASSERT((GLint) (lambda[i] * 10) <= (GLint) (lambda[i+1] * 10));
685 }
686 }
687 }
688 #endif /* DEBUG */
689
690 if (lambda[0] <= minMagThresh && (n <= 1 || lambda[n-1] <= minMagThresh)) {
691 /* magnification for whole span */
692 *magStart = 0;
693 *magEnd = n;
694 *minStart = *minEnd = 0;
695 }
696 else if (lambda[0] > minMagThresh && (n <=1 || lambda[n-1] > minMagThresh)) {
697 /* minification for whole span */
698 *minStart = 0;
699 *minEnd = n;
700 *magStart = *magEnd = 0;
701 }
702 else {
703 /* a mix of minification and magnification */
704 GLuint i;
705 if (lambda[0] > minMagThresh) {
706 /* start with minification */
707 for (i = 1; i < n; i++) {
708 if (lambda[i] <= minMagThresh)
709 break;
710 }
711 *minStart = 0;
712 *minEnd = i;
713 *magStart = i;
714 *magEnd = n;
715 }
716 else {
717 /* start with magnification */
718 for (i = 1; i < n; i++) {
719 if (lambda[i] > minMagThresh)
720 break;
721 }
722 *magStart = 0;
723 *magEnd = i;
724 *minStart = i;
725 *minEnd = n;
726 }
727 }
728
729 #if 0
730 /* Verify the min/mag Start/End values
731 * We don't use this either (see above)
732 */
733 {
734 GLint i;
735 for (i = 0; i < n; i++) {
736 if (lambda[i] > minMagThresh) {
737 /* minification */
738 ASSERT(i >= *minStart);
739 ASSERT(i < *minEnd);
740 }
741 else {
742 /* magnification */
743 ASSERT(i >= *magStart);
744 ASSERT(i < *magEnd);
745 }
746 }
747 }
748 #endif
749 }
750
751
752 /**
753 * When we sample the border color, it must be interpreted according to
754 * the base texture format. Ex: if the texture base format it GL_ALPHA,
755 * we return (0,0,0,BorderAlpha).
756 */
757 static INLINE void
758 get_border_color(const struct gl_texture_object *tObj,
759 const struct gl_texture_image *img,
760 GLfloat rgba[4])
761 {
762 switch (img->_BaseFormat) {
763 case GL_RGB:
764 rgba[0] = tObj->BorderColor.f[0];
765 rgba[1] = tObj->BorderColor.f[1];
766 rgba[2] = tObj->BorderColor.f[2];
767 rgba[3] = 1.0F;
768 break;
769 case GL_ALPHA:
770 rgba[0] = rgba[1] = rgba[2] = 0.0;
771 rgba[3] = tObj->BorderColor.f[3];
772 break;
773 case GL_LUMINANCE:
774 rgba[0] = rgba[1] = rgba[2] = tObj->BorderColor.f[0];
775 rgba[3] = 1.0;
776 break;
777 case GL_LUMINANCE_ALPHA:
778 rgba[0] = rgba[1] = rgba[2] = tObj->BorderColor.f[0];
779 rgba[3] = tObj->BorderColor.f[3];
780 break;
781 case GL_INTENSITY:
782 rgba[0] = rgba[1] = rgba[2] = rgba[3] = tObj->BorderColor.f[0];
783 break;
784 default:
785 COPY_4V(rgba, tObj->BorderColor.f);
786 }
787 }
788
789
790 /**********************************************************************/
791 /* 1-D Texture Sampling Functions */
792 /**********************************************************************/
793
794 /**
795 * Return the texture sample for coordinate (s) using GL_NEAREST filter.
796 */
797 static INLINE void
798 sample_1d_nearest(GLcontext *ctx,
799 const struct gl_texture_object *tObj,
800 const struct gl_texture_image *img,
801 const GLfloat texcoord[4], GLfloat rgba[4])
802 {
803 const GLint width = img->Width2; /* without border, power of two */
804 GLint i;
805 i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
806 /* skip over the border, if any */
807 i += img->Border;
808 if (i < 0 || i >= (GLint) img->Width) {
809 /* Need this test for GL_CLAMP_TO_BORDER mode */
810 get_border_color(tObj, img, rgba);
811 }
812 else {
813 img->FetchTexelf(img, i, 0, 0, rgba);
814 }
815 }
816
817
818 /**
819 * Return the texture sample for coordinate (s) using GL_LINEAR filter.
820 */
821 static INLINE void
822 sample_1d_linear(GLcontext *ctx,
823 const struct gl_texture_object *tObj,
824 const struct gl_texture_image *img,
825 const GLfloat texcoord[4], GLfloat rgba[4])
826 {
827 const GLint width = img->Width2;
828 GLint i0, i1;
829 GLbitfield useBorderColor = 0x0;
830 GLfloat a;
831 GLfloat t0[4], t1[4]; /* texels */
832
833 linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
834
835 if (img->Border) {
836 i0 += img->Border;
837 i1 += img->Border;
838 }
839 else {
840 if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
841 if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
842 }
843
844 /* fetch texel colors */
845 if (useBorderColor & I0BIT) {
846 get_border_color(tObj, img, t0);
847 }
848 else {
849 img->FetchTexelf(img, i0, 0, 0, t0);
850 }
851 if (useBorderColor & I1BIT) {
852 get_border_color(tObj, img, t1);
853 }
854 else {
855 img->FetchTexelf(img, i1, 0, 0, t1);
856 }
857
858 lerp_rgba(rgba, a, t0, t1);
859 }
860
861
862 static void
863 sample_1d_nearest_mipmap_nearest(GLcontext *ctx,
864 const struct gl_texture_object *tObj,
865 GLuint n, const GLfloat texcoord[][4],
866 const GLfloat lambda[], GLfloat rgba[][4])
867 {
868 GLuint i;
869 ASSERT(lambda != NULL);
870 for (i = 0; i < n; i++) {
871 GLint level = nearest_mipmap_level(tObj, lambda[i]);
872 sample_1d_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
873 }
874 }
875
876
877 static void
878 sample_1d_linear_mipmap_nearest(GLcontext *ctx,
879 const struct gl_texture_object *tObj,
880 GLuint n, const GLfloat texcoord[][4],
881 const GLfloat lambda[], GLfloat rgba[][4])
882 {
883 GLuint i;
884 ASSERT(lambda != NULL);
885 for (i = 0; i < n; i++) {
886 GLint level = nearest_mipmap_level(tObj, lambda[i]);
887 sample_1d_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
888 }
889 }
890
891
892 static void
893 sample_1d_nearest_mipmap_linear(GLcontext *ctx,
894 const struct gl_texture_object *tObj,
895 GLuint n, const GLfloat texcoord[][4],
896 const GLfloat lambda[], GLfloat rgba[][4])
897 {
898 GLuint i;
899 ASSERT(lambda != NULL);
900 for (i = 0; i < n; i++) {
901 GLint level = linear_mipmap_level(tObj, lambda[i]);
902 if (level >= tObj->_MaxLevel) {
903 sample_1d_nearest(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
904 texcoord[i], rgba[i]);
905 }
906 else {
907 GLfloat t0[4], t1[4];
908 const GLfloat f = FRAC(lambda[i]);
909 sample_1d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
910 sample_1d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
911 lerp_rgba(rgba[i], f, t0, t1);
912 }
913 }
914 }
915
916
917 static void
918 sample_1d_linear_mipmap_linear(GLcontext *ctx,
919 const struct gl_texture_object *tObj,
920 GLuint n, const GLfloat texcoord[][4],
921 const GLfloat lambda[], GLfloat rgba[][4])
922 {
923 GLuint i;
924 ASSERT(lambda != NULL);
925 for (i = 0; i < n; i++) {
926 GLint level = linear_mipmap_level(tObj, lambda[i]);
927 if (level >= tObj->_MaxLevel) {
928 sample_1d_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
929 texcoord[i], rgba[i]);
930 }
931 else {
932 GLfloat t0[4], t1[4];
933 const GLfloat f = FRAC(lambda[i]);
934 sample_1d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
935 sample_1d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
936 lerp_rgba(rgba[i], f, t0, t1);
937 }
938 }
939 }
940
941
942 /** Sample 1D texture, nearest filtering for both min/magnification */
943 static void
944 sample_nearest_1d( GLcontext *ctx,
945 const struct gl_texture_object *tObj, GLuint n,
946 const GLfloat texcoords[][4], const GLfloat lambda[],
947 GLfloat rgba[][4] )
948 {
949 GLuint i;
950 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
951 (void) lambda;
952 for (i = 0; i < n; i++) {
953 sample_1d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
954 }
955 }
956
957
958 /** Sample 1D texture, linear filtering for both min/magnification */
959 static void
960 sample_linear_1d( GLcontext *ctx,
961 const struct gl_texture_object *tObj, GLuint n,
962 const GLfloat texcoords[][4], const GLfloat lambda[],
963 GLfloat rgba[][4] )
964 {
965 GLuint i;
966 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
967 (void) lambda;
968 for (i = 0; i < n; i++) {
969 sample_1d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
970 }
971 }
972
973
974 /** Sample 1D texture, using lambda to choose between min/magnification */
975 static void
976 sample_lambda_1d( GLcontext *ctx,
977 const struct gl_texture_object *tObj, GLuint n,
978 const GLfloat texcoords[][4],
979 const GLfloat lambda[], GLfloat rgba[][4] )
980 {
981 GLuint minStart, minEnd; /* texels with minification */
982 GLuint magStart, magEnd; /* texels with magnification */
983 GLuint i;
984
985 ASSERT(lambda != NULL);
986 compute_min_mag_ranges(tObj, n, lambda,
987 &minStart, &minEnd, &magStart, &magEnd);
988
989 if (minStart < minEnd) {
990 /* do the minified texels */
991 const GLuint m = minEnd - minStart;
992 switch (tObj->MinFilter) {
993 case GL_NEAREST:
994 for (i = minStart; i < minEnd; i++)
995 sample_1d_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
996 texcoords[i], rgba[i]);
997 break;
998 case GL_LINEAR:
999 for (i = minStart; i < minEnd; i++)
1000 sample_1d_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
1001 texcoords[i], rgba[i]);
1002 break;
1003 case GL_NEAREST_MIPMAP_NEAREST:
1004 sample_1d_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
1005 lambda + minStart, rgba + minStart);
1006 break;
1007 case GL_LINEAR_MIPMAP_NEAREST:
1008 sample_1d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
1009 lambda + minStart, rgba + minStart);
1010 break;
1011 case GL_NEAREST_MIPMAP_LINEAR:
1012 sample_1d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
1013 lambda + minStart, rgba + minStart);
1014 break;
1015 case GL_LINEAR_MIPMAP_LINEAR:
1016 sample_1d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
1017 lambda + minStart, rgba + minStart);
1018 break;
1019 default:
1020 _mesa_problem(ctx, "Bad min filter in sample_1d_texture");
1021 return;
1022 }
1023 }
1024
1025 if (magStart < magEnd) {
1026 /* do the magnified texels */
1027 switch (tObj->MagFilter) {
1028 case GL_NEAREST:
1029 for (i = magStart; i < magEnd; i++)
1030 sample_1d_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
1031 texcoords[i], rgba[i]);
1032 break;
1033 case GL_LINEAR:
1034 for (i = magStart; i < magEnd; i++)
1035 sample_1d_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
1036 texcoords[i], rgba[i]);
1037 break;
1038 default:
1039 _mesa_problem(ctx, "Bad mag filter in sample_1d_texture");
1040 return;
1041 }
1042 }
1043 }
1044
1045
1046 /**********************************************************************/
1047 /* 2-D Texture Sampling Functions */
1048 /**********************************************************************/
1049
1050
1051 /**
1052 * Return the texture sample for coordinate (s,t) using GL_NEAREST filter.
1053 */
1054 static INLINE void
1055 sample_2d_nearest(GLcontext *ctx,
1056 const struct gl_texture_object *tObj,
1057 const struct gl_texture_image *img,
1058 const GLfloat texcoord[4],
1059 GLfloat rgba[])
1060 {
1061 const GLint width = img->Width2; /* without border, power of two */
1062 const GLint height = img->Height2; /* without border, power of two */
1063 GLint i, j;
1064 (void) ctx;
1065
1066 i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
1067 j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]);
1068
1069 /* skip over the border, if any */
1070 i += img->Border;
1071 j += img->Border;
1072
1073 if (i < 0 || i >= (GLint) img->Width || j < 0 || j >= (GLint) img->Height) {
1074 /* Need this test for GL_CLAMP_TO_BORDER mode */
1075 get_border_color(tObj, img, rgba);
1076 }
1077 else {
1078 img->FetchTexelf(img, i, j, 0, rgba);
1079 }
1080 }
1081
1082
1083 /**
1084 * Return the texture sample for coordinate (s,t) using GL_LINEAR filter.
1085 * New sampling code contributed by Lynn Quam <quam@ai.sri.com>.
1086 */
1087 static INLINE void
1088 sample_2d_linear(GLcontext *ctx,
1089 const struct gl_texture_object *tObj,
1090 const struct gl_texture_image *img,
1091 const GLfloat texcoord[4],
1092 GLfloat rgba[])
1093 {
1094 const GLint width = img->Width2;
1095 const GLint height = img->Height2;
1096 GLint i0, j0, i1, j1;
1097 GLbitfield useBorderColor = 0x0;
1098 GLfloat a, b;
1099 GLfloat t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
1100
1101 linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
1102 linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b);
1103
1104 if (img->Border) {
1105 i0 += img->Border;
1106 i1 += img->Border;
1107 j0 += img->Border;
1108 j1 += img->Border;
1109 }
1110 else {
1111 if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
1112 if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
1113 if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT;
1114 if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT;
1115 }
1116
1117 /* fetch four texel colors */
1118 if (useBorderColor & (I0BIT | J0BIT)) {
1119 get_border_color(tObj, img, t00);
1120 }
1121 else {
1122 img->FetchTexelf(img, i0, j0, 0, t00);
1123 }
1124 if (useBorderColor & (I1BIT | J0BIT)) {
1125 get_border_color(tObj, img, t10);
1126 }
1127 else {
1128 img->FetchTexelf(img, i1, j0, 0, t10);
1129 }
1130 if (useBorderColor & (I0BIT | J1BIT)) {
1131 get_border_color(tObj, img, t01);
1132 }
1133 else {
1134 img->FetchTexelf(img, i0, j1, 0, t01);
1135 }
1136 if (useBorderColor & (I1BIT | J1BIT)) {
1137 get_border_color(tObj, img, t11);
1138 }
1139 else {
1140 img->FetchTexelf(img, i1, j1, 0, t11);
1141 }
1142
1143 lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11);
1144 }
1145
1146
1147 /**
1148 * As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT.
1149 * We don't have to worry about the texture border.
1150 */
1151 static INLINE void
1152 sample_2d_linear_repeat(GLcontext *ctx,
1153 const struct gl_texture_object *tObj,
1154 const struct gl_texture_image *img,
1155 const GLfloat texcoord[4],
1156 GLfloat rgba[])
1157 {
1158 const GLint width = img->Width2;
1159 const GLint height = img->Height2;
1160 GLint i0, j0, i1, j1;
1161 GLfloat wi, wj;
1162 GLfloat t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
1163
1164 (void) ctx;
1165
1166 ASSERT(tObj->WrapS == GL_REPEAT);
1167 ASSERT(tObj->WrapT == GL_REPEAT);
1168 ASSERT(img->Border == 0);
1169 ASSERT(img->_BaseFormat != GL_COLOR_INDEX);
1170 ASSERT(img->_IsPowerOfTwo);
1171
1172 linear_repeat_texel_location(width, texcoord[0], &i0, &i1, &wi);
1173 linear_repeat_texel_location(height, texcoord[1], &j0, &j1, &wj);
1174
1175 img->FetchTexelf(img, i0, j0, 0, t00);
1176 img->FetchTexelf(img, i1, j0, 0, t10);
1177 img->FetchTexelf(img, i0, j1, 0, t01);
1178 img->FetchTexelf(img, i1, j1, 0, t11);
1179
1180 lerp_rgba_2d(rgba, wi, wj, t00, t10, t01, t11);
1181 }
1182
1183
1184 static void
1185 sample_2d_nearest_mipmap_nearest(GLcontext *ctx,
1186 const struct gl_texture_object *tObj,
1187 GLuint n, const GLfloat texcoord[][4],
1188 const GLfloat lambda[], GLfloat rgba[][4])
1189 {
1190 GLuint i;
1191 for (i = 0; i < n; i++) {
1192 GLint level = nearest_mipmap_level(tObj, lambda[i]);
1193 sample_2d_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
1194 }
1195 }
1196
1197
1198 static void
1199 sample_2d_linear_mipmap_nearest(GLcontext *ctx,
1200 const struct gl_texture_object *tObj,
1201 GLuint n, const GLfloat texcoord[][4],
1202 const GLfloat lambda[], GLfloat rgba[][4])
1203 {
1204 GLuint i;
1205 ASSERT(lambda != NULL);
1206 for (i = 0; i < n; i++) {
1207 GLint level = nearest_mipmap_level(tObj, lambda[i]);
1208 sample_2d_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
1209 }
1210 }
1211
1212
1213 static void
1214 sample_2d_nearest_mipmap_linear(GLcontext *ctx,
1215 const struct gl_texture_object *tObj,
1216 GLuint n, const GLfloat texcoord[][4],
1217 const GLfloat lambda[], GLfloat rgba[][4])
1218 {
1219 GLuint i;
1220 ASSERT(lambda != NULL);
1221 for (i = 0; i < n; i++) {
1222 GLint level = linear_mipmap_level(tObj, lambda[i]);
1223 if (level >= tObj->_MaxLevel) {
1224 sample_2d_nearest(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
1225 texcoord[i], rgba[i]);
1226 }
1227 else {
1228 GLfloat t0[4], t1[4]; /* texels */
1229 const GLfloat f = FRAC(lambda[i]);
1230 sample_2d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
1231 sample_2d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
1232 lerp_rgba(rgba[i], f, t0, t1);
1233 }
1234 }
1235 }
1236
1237
1238 static void
1239 sample_2d_linear_mipmap_linear( GLcontext *ctx,
1240 const struct gl_texture_object *tObj,
1241 GLuint n, const GLfloat texcoord[][4],
1242 const GLfloat lambda[], GLfloat rgba[][4] )
1243 {
1244 GLuint i;
1245 ASSERT(lambda != NULL);
1246 for (i = 0; i < n; i++) {
1247 GLint level = linear_mipmap_level(tObj, lambda[i]);
1248 if (level >= tObj->_MaxLevel) {
1249 sample_2d_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
1250 texcoord[i], rgba[i]);
1251 }
1252 else {
1253 GLfloat t0[4], t1[4]; /* texels */
1254 const GLfloat f = FRAC(lambda[i]);
1255 sample_2d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
1256 sample_2d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
1257 lerp_rgba(rgba[i], f, t0, t1);
1258 }
1259 }
1260 }
1261
1262
1263 static void
1264 sample_2d_linear_mipmap_linear_repeat(GLcontext *ctx,
1265 const struct gl_texture_object *tObj,
1266 GLuint n, const GLfloat texcoord[][4],
1267 const GLfloat lambda[], GLfloat rgba[][4])
1268 {
1269 GLuint i;
1270 ASSERT(lambda != NULL);
1271 ASSERT(tObj->WrapS == GL_REPEAT);
1272 ASSERT(tObj->WrapT == GL_REPEAT);
1273 for (i = 0; i < n; i++) {
1274 GLint level = linear_mipmap_level(tObj, lambda[i]);
1275 if (level >= tObj->_MaxLevel) {
1276 sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
1277 texcoord[i], rgba[i]);
1278 }
1279 else {
1280 GLfloat t0[4], t1[4]; /* texels */
1281 const GLfloat f = FRAC(lambda[i]);
1282 sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level ],
1283 texcoord[i], t0);
1284 sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level+1],
1285 texcoord[i], t1);
1286 lerp_rgba(rgba[i], f, t0, t1);
1287 }
1288 }
1289 }
1290
1291
1292 /** Sample 2D texture, nearest filtering for both min/magnification */
1293 static void
1294 sample_nearest_2d(GLcontext *ctx,
1295 const struct gl_texture_object *tObj, GLuint n,
1296 const GLfloat texcoords[][4],
1297 const GLfloat lambda[], GLfloat rgba[][4])
1298 {
1299 GLuint i;
1300 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
1301 (void) lambda;
1302 for (i = 0; i < n; i++) {
1303 sample_2d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
1304 }
1305 }
1306
1307
1308 /** Sample 2D texture, linear filtering for both min/magnification */
1309 static void
1310 sample_linear_2d(GLcontext *ctx,
1311 const struct gl_texture_object *tObj, GLuint n,
1312 const GLfloat texcoords[][4],
1313 const GLfloat lambda[], GLfloat rgba[][4])
1314 {
1315 GLuint i;
1316 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
1317 (void) lambda;
1318 if (tObj->WrapS == GL_REPEAT &&
1319 tObj->WrapT == GL_REPEAT &&
1320 image->_IsPowerOfTwo &&
1321 image->Border == 0) {
1322 for (i = 0; i < n; i++) {
1323 sample_2d_linear_repeat(ctx, tObj, image, texcoords[i], rgba[i]);
1324 }
1325 }
1326 else {
1327 for (i = 0; i < n; i++) {
1328 sample_2d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
1329 }
1330 }
1331 }
1332
1333
1334 /**
1335 * Optimized 2-D texture sampling:
1336 * S and T wrap mode == GL_REPEAT
1337 * GL_NEAREST min/mag filter
1338 * No border,
1339 * RowStride == Width,
1340 * Format = GL_RGB
1341 */
1342 static void
1343 opt_sample_rgb_2d(GLcontext *ctx,
1344 const struct gl_texture_object *tObj,
1345 GLuint n, const GLfloat texcoords[][4],
1346 const GLfloat lambda[], GLfloat rgba[][4])
1347 {
1348 const struct gl_texture_image *img = tObj->Image[0][tObj->BaseLevel];
1349 const GLfloat width = (GLfloat) img->Width;
1350 const GLfloat height = (GLfloat) img->Height;
1351 const GLint colMask = img->Width - 1;
1352 const GLint rowMask = img->Height - 1;
1353 const GLint shift = img->WidthLog2;
1354 GLuint k;
1355 (void) ctx;
1356 (void) lambda;
1357 ASSERT(tObj->WrapS==GL_REPEAT);
1358 ASSERT(tObj->WrapT==GL_REPEAT);
1359 ASSERT(img->Border==0);
1360 ASSERT(img->TexFormat == MESA_FORMAT_RGB888);
1361 ASSERT(img->_IsPowerOfTwo);
1362
1363 for (k=0; k<n; k++) {
1364 GLint i = IFLOOR(texcoords[k][0] * width) & colMask;
1365 GLint j = IFLOOR(texcoords[k][1] * height) & rowMask;
1366 GLint pos = (j << shift) | i;
1367 GLubyte *texel = ((GLubyte *) img->Data) + 3*pos;
1368 rgba[k][RCOMP] = UBYTE_TO_FLOAT(texel[2]);
1369 rgba[k][GCOMP] = UBYTE_TO_FLOAT(texel[1]);
1370 rgba[k][BCOMP] = UBYTE_TO_FLOAT(texel[0]);
1371 }
1372 }
1373
1374
1375 /**
1376 * Optimized 2-D texture sampling:
1377 * S and T wrap mode == GL_REPEAT
1378 * GL_NEAREST min/mag filter
1379 * No border
1380 * RowStride == Width,
1381 * Format = GL_RGBA
1382 */
1383 static void
1384 opt_sample_rgba_2d(GLcontext *ctx,
1385 const struct gl_texture_object *tObj,
1386 GLuint n, const GLfloat texcoords[][4],
1387 const GLfloat lambda[], GLfloat rgba[][4])
1388 {
1389 const struct gl_texture_image *img = tObj->Image[0][tObj->BaseLevel];
1390 const GLfloat width = (GLfloat) img->Width;
1391 const GLfloat height = (GLfloat) img->Height;
1392 const GLint colMask = img->Width - 1;
1393 const GLint rowMask = img->Height - 1;
1394 const GLint shift = img->WidthLog2;
1395 GLuint i;
1396 (void) ctx;
1397 (void) lambda;
1398 ASSERT(tObj->WrapS==GL_REPEAT);
1399 ASSERT(tObj->WrapT==GL_REPEAT);
1400 ASSERT(img->Border==0);
1401 ASSERT(img->TexFormat == MESA_FORMAT_RGBA8888);
1402 ASSERT(img->_IsPowerOfTwo);
1403
1404 for (i = 0; i < n; i++) {
1405 const GLint col = IFLOOR(texcoords[i][0] * width) & colMask;
1406 const GLint row = IFLOOR(texcoords[i][1] * height) & rowMask;
1407 const GLint pos = (row << shift) | col;
1408 const GLuint texel = *((GLuint *) img->Data + pos);
1409 rgba[i][RCOMP] = UBYTE_TO_FLOAT( (texel >> 24) );
1410 rgba[i][GCOMP] = UBYTE_TO_FLOAT( (texel >> 16) & 0xff );
1411 rgba[i][BCOMP] = UBYTE_TO_FLOAT( (texel >> 8) & 0xff );
1412 rgba[i][ACOMP] = UBYTE_TO_FLOAT( (texel ) & 0xff );
1413 }
1414 }
1415
1416
1417 /** Sample 2D texture, using lambda to choose between min/magnification */
1418 static void
1419 sample_lambda_2d(GLcontext *ctx,
1420 const struct gl_texture_object *tObj,
1421 GLuint n, const GLfloat texcoords[][4],
1422 const GLfloat lambda[], GLfloat rgba[][4])
1423 {
1424 const struct gl_texture_image *tImg = tObj->Image[0][tObj->BaseLevel];
1425 GLuint minStart, minEnd; /* texels with minification */
1426 GLuint magStart, magEnd; /* texels with magnification */
1427
1428 const GLboolean repeatNoBorderPOT = (tObj->WrapS == GL_REPEAT)
1429 && (tObj->WrapT == GL_REPEAT)
1430 && (tImg->Border == 0 && (tImg->Width == tImg->RowStride))
1431 && (tImg->_BaseFormat != GL_COLOR_INDEX)
1432 && tImg->_IsPowerOfTwo;
1433
1434 ASSERT(lambda != NULL);
1435 compute_min_mag_ranges(tObj, n, lambda,
1436 &minStart, &minEnd, &magStart, &magEnd);
1437
1438 if (minStart < minEnd) {
1439 /* do the minified texels */
1440 const GLuint m = minEnd - minStart;
1441 switch (tObj->MinFilter) {
1442 case GL_NEAREST:
1443 if (repeatNoBorderPOT) {
1444 switch (tImg->TexFormat) {
1445 case MESA_FORMAT_RGB888:
1446 opt_sample_rgb_2d(ctx, tObj, m, texcoords + minStart,
1447 NULL, rgba + minStart);
1448 break;
1449 case MESA_FORMAT_RGBA8888:
1450 opt_sample_rgba_2d(ctx, tObj, m, texcoords + minStart,
1451 NULL, rgba + minStart);
1452 break;
1453 default:
1454 sample_nearest_2d(ctx, tObj, m, texcoords + minStart,
1455 NULL, rgba + minStart );
1456 }
1457 }
1458 else {
1459 sample_nearest_2d(ctx, tObj, m, texcoords + minStart,
1460 NULL, rgba + minStart);
1461 }
1462 break;
1463 case GL_LINEAR:
1464 sample_linear_2d(ctx, tObj, m, texcoords + minStart,
1465 NULL, rgba + minStart);
1466 break;
1467 case GL_NEAREST_MIPMAP_NEAREST:
1468 sample_2d_nearest_mipmap_nearest(ctx, tObj, m,
1469 texcoords + minStart,
1470 lambda + minStart, rgba + minStart);
1471 break;
1472 case GL_LINEAR_MIPMAP_NEAREST:
1473 sample_2d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
1474 lambda + minStart, rgba + minStart);
1475 break;
1476 case GL_NEAREST_MIPMAP_LINEAR:
1477 sample_2d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
1478 lambda + minStart, rgba + minStart);
1479 break;
1480 case GL_LINEAR_MIPMAP_LINEAR:
1481 if (repeatNoBorderPOT)
1482 sample_2d_linear_mipmap_linear_repeat(ctx, tObj, m,
1483 texcoords + minStart, lambda + minStart, rgba + minStart);
1484 else
1485 sample_2d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
1486 lambda + minStart, rgba + minStart);
1487 break;
1488 default:
1489 _mesa_problem(ctx, "Bad min filter in sample_2d_texture");
1490 return;
1491 }
1492 }
1493
1494 if (magStart < magEnd) {
1495 /* do the magnified texels */
1496 const GLuint m = magEnd - magStart;
1497
1498 switch (tObj->MagFilter) {
1499 case GL_NEAREST:
1500 if (repeatNoBorderPOT) {
1501 switch (tImg->TexFormat) {
1502 case MESA_FORMAT_RGB888:
1503 opt_sample_rgb_2d(ctx, tObj, m, texcoords + magStart,
1504 NULL, rgba + magStart);
1505 break;
1506 case MESA_FORMAT_RGBA8888:
1507 opt_sample_rgba_2d(ctx, tObj, m, texcoords + magStart,
1508 NULL, rgba + magStart);
1509 break;
1510 default:
1511 sample_nearest_2d(ctx, tObj, m, texcoords + magStart,
1512 NULL, rgba + magStart );
1513 }
1514 }
1515 else {
1516 sample_nearest_2d(ctx, tObj, m, texcoords + magStart,
1517 NULL, rgba + magStart);
1518 }
1519 break;
1520 case GL_LINEAR:
1521 sample_linear_2d(ctx, tObj, m, texcoords + magStart,
1522 NULL, rgba + magStart);
1523 break;
1524 default:
1525 _mesa_problem(ctx, "Bad mag filter in sample_lambda_2d");
1526 }
1527 }
1528 }
1529
1530
1531
1532 /**********************************************************************/
1533 /* 3-D Texture Sampling Functions */
1534 /**********************************************************************/
1535
1536 /**
1537 * Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
1538 */
1539 static INLINE void
1540 sample_3d_nearest(GLcontext *ctx,
1541 const struct gl_texture_object *tObj,
1542 const struct gl_texture_image *img,
1543 const GLfloat texcoord[4],
1544 GLfloat rgba[4])
1545 {
1546 const GLint width = img->Width2; /* without border, power of two */
1547 const GLint height = img->Height2; /* without border, power of two */
1548 const GLint depth = img->Depth2; /* without border, power of two */
1549 GLint i, j, k;
1550 (void) ctx;
1551
1552 i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
1553 j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]);
1554 k = nearest_texel_location(tObj->WrapR, img, depth, texcoord[2]);
1555
1556 if (i < 0 || i >= (GLint) img->Width ||
1557 j < 0 || j >= (GLint) img->Height ||
1558 k < 0 || k >= (GLint) img->Depth) {
1559 /* Need this test for GL_CLAMP_TO_BORDER mode */
1560 get_border_color(tObj, img, rgba);
1561 }
1562 else {
1563 img->FetchTexelf(img, i, j, k, rgba);
1564 }
1565 }
1566
1567
1568 /**
1569 * Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter.
1570 */
1571 static void
1572 sample_3d_linear(GLcontext *ctx,
1573 const struct gl_texture_object *tObj,
1574 const struct gl_texture_image *img,
1575 const GLfloat texcoord[4],
1576 GLfloat rgba[4])
1577 {
1578 const GLint width = img->Width2;
1579 const GLint height = img->Height2;
1580 const GLint depth = img->Depth2;
1581 GLint i0, j0, k0, i1, j1, k1;
1582 GLbitfield useBorderColor = 0x0;
1583 GLfloat a, b, c;
1584 GLfloat t000[4], t010[4], t001[4], t011[4];
1585 GLfloat t100[4], t110[4], t101[4], t111[4];
1586
1587 linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
1588 linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b);
1589 linear_texel_locations(tObj->WrapR, img, depth, texcoord[2], &k0, &k1, &c);
1590
1591 if (img->Border) {
1592 i0 += img->Border;
1593 i1 += img->Border;
1594 j0 += img->Border;
1595 j1 += img->Border;
1596 k0 += img->Border;
1597 k1 += img->Border;
1598 }
1599 else {
1600 /* check if sampling texture border color */
1601 if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
1602 if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
1603 if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT;
1604 if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT;
1605 if (k0 < 0 || k0 >= depth) useBorderColor |= K0BIT;
1606 if (k1 < 0 || k1 >= depth) useBorderColor |= K1BIT;
1607 }
1608
1609 /* Fetch texels */
1610 if (useBorderColor & (I0BIT | J0BIT | K0BIT)) {
1611 get_border_color(tObj, img, t000);
1612 }
1613 else {
1614 img->FetchTexelf(img, i0, j0, k0, t000);
1615 }
1616 if (useBorderColor & (I1BIT | J0BIT | K0BIT)) {
1617 get_border_color(tObj, img, t100);
1618 }
1619 else {
1620 img->FetchTexelf(img, i1, j0, k0, t100);
1621 }
1622 if (useBorderColor & (I0BIT | J1BIT | K0BIT)) {
1623 get_border_color(tObj, img, t010);
1624 }
1625 else {
1626 img->FetchTexelf(img, i0, j1, k0, t010);
1627 }
1628 if (useBorderColor & (I1BIT | J1BIT | K0BIT)) {
1629 get_border_color(tObj, img, t110);
1630 }
1631 else {
1632 img->FetchTexelf(img, i1, j1, k0, t110);
1633 }
1634
1635 if (useBorderColor & (I0BIT | J0BIT | K1BIT)) {
1636 get_border_color(tObj, img, t001);
1637 }
1638 else {
1639 img->FetchTexelf(img, i0, j0, k1, t001);
1640 }
1641 if (useBorderColor & (I1BIT | J0BIT | K1BIT)) {
1642 get_border_color(tObj, img, t101);
1643 }
1644 else {
1645 img->FetchTexelf(img, i1, j0, k1, t101);
1646 }
1647 if (useBorderColor & (I0BIT | J1BIT | K1BIT)) {
1648 get_border_color(tObj, img, t011);
1649 }
1650 else {
1651 img->FetchTexelf(img, i0, j1, k1, t011);
1652 }
1653 if (useBorderColor & (I1BIT | J1BIT | K1BIT)) {
1654 get_border_color(tObj, img, t111);
1655 }
1656 else {
1657 img->FetchTexelf(img, i1, j1, k1, t111);
1658 }
1659
1660 /* trilinear interpolation of samples */
1661 lerp_rgba_3d(rgba, a, b, c, t000, t100, t010, t110, t001, t101, t011, t111);
1662 }
1663
1664
1665 static void
1666 sample_3d_nearest_mipmap_nearest(GLcontext *ctx,
1667 const struct gl_texture_object *tObj,
1668 GLuint n, const GLfloat texcoord[][4],
1669 const GLfloat lambda[], GLfloat rgba[][4] )
1670 {
1671 GLuint i;
1672 for (i = 0; i < n; i++) {
1673 GLint level = nearest_mipmap_level(tObj, lambda[i]);
1674 sample_3d_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
1675 }
1676 }
1677
1678
1679 static void
1680 sample_3d_linear_mipmap_nearest(GLcontext *ctx,
1681 const struct gl_texture_object *tObj,
1682 GLuint n, const GLfloat texcoord[][4],
1683 const GLfloat lambda[], GLfloat rgba[][4])
1684 {
1685 GLuint i;
1686 ASSERT(lambda != NULL);
1687 for (i = 0; i < n; i++) {
1688 GLint level = nearest_mipmap_level(tObj, lambda[i]);
1689 sample_3d_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
1690 }
1691 }
1692
1693
1694 static void
1695 sample_3d_nearest_mipmap_linear(GLcontext *ctx,
1696 const struct gl_texture_object *tObj,
1697 GLuint n, const GLfloat texcoord[][4],
1698 const GLfloat lambda[], GLfloat rgba[][4])
1699 {
1700 GLuint i;
1701 ASSERT(lambda != NULL);
1702 for (i = 0; i < n; i++) {
1703 GLint level = linear_mipmap_level(tObj, lambda[i]);
1704 if (level >= tObj->_MaxLevel) {
1705 sample_3d_nearest(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
1706 texcoord[i], rgba[i]);
1707 }
1708 else {
1709 GLfloat t0[4], t1[4]; /* texels */
1710 const GLfloat f = FRAC(lambda[i]);
1711 sample_3d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
1712 sample_3d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
1713 lerp_rgba(rgba[i], f, t0, t1);
1714 }
1715 }
1716 }
1717
1718
1719 static void
1720 sample_3d_linear_mipmap_linear(GLcontext *ctx,
1721 const struct gl_texture_object *tObj,
1722 GLuint n, const GLfloat texcoord[][4],
1723 const GLfloat lambda[], GLfloat rgba[][4])
1724 {
1725 GLuint i;
1726 ASSERT(lambda != NULL);
1727 for (i = 0; i < n; i++) {
1728 GLint level = linear_mipmap_level(tObj, lambda[i]);
1729 if (level >= tObj->_MaxLevel) {
1730 sample_3d_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
1731 texcoord[i], rgba[i]);
1732 }
1733 else {
1734 GLfloat t0[4], t1[4]; /* texels */
1735 const GLfloat f = FRAC(lambda[i]);
1736 sample_3d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
1737 sample_3d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
1738 lerp_rgba(rgba[i], f, t0, t1);
1739 }
1740 }
1741 }
1742
1743
1744 /** Sample 3D texture, nearest filtering for both min/magnification */
1745 static void
1746 sample_nearest_3d(GLcontext *ctx,
1747 const struct gl_texture_object *tObj, GLuint n,
1748 const GLfloat texcoords[][4], const GLfloat lambda[],
1749 GLfloat rgba[][4])
1750 {
1751 GLuint i;
1752 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
1753 (void) lambda;
1754 for (i = 0; i < n; i++) {
1755 sample_3d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
1756 }
1757 }
1758
1759
1760 /** Sample 3D texture, linear filtering for both min/magnification */
1761 static void
1762 sample_linear_3d(GLcontext *ctx,
1763 const struct gl_texture_object *tObj, GLuint n,
1764 const GLfloat texcoords[][4],
1765 const GLfloat lambda[], GLfloat rgba[][4])
1766 {
1767 GLuint i;
1768 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
1769 (void) lambda;
1770 for (i = 0; i < n; i++) {
1771 sample_3d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
1772 }
1773 }
1774
1775
1776 /** Sample 3D texture, using lambda to choose between min/magnification */
1777 static void
1778 sample_lambda_3d(GLcontext *ctx,
1779 const struct gl_texture_object *tObj, GLuint n,
1780 const GLfloat texcoords[][4], const GLfloat lambda[],
1781 GLfloat rgba[][4])
1782 {
1783 GLuint minStart, minEnd; /* texels with minification */
1784 GLuint magStart, magEnd; /* texels with magnification */
1785 GLuint i;
1786
1787 ASSERT(lambda != NULL);
1788 compute_min_mag_ranges(tObj, n, lambda,
1789 &minStart, &minEnd, &magStart, &magEnd);
1790
1791 if (minStart < minEnd) {
1792 /* do the minified texels */
1793 GLuint m = minEnd - minStart;
1794 switch (tObj->MinFilter) {
1795 case GL_NEAREST:
1796 for (i = minStart; i < minEnd; i++)
1797 sample_3d_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
1798 texcoords[i], rgba[i]);
1799 break;
1800 case GL_LINEAR:
1801 for (i = minStart; i < minEnd; i++)
1802 sample_3d_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
1803 texcoords[i], rgba[i]);
1804 break;
1805 case GL_NEAREST_MIPMAP_NEAREST:
1806 sample_3d_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
1807 lambda + minStart, rgba + minStart);
1808 break;
1809 case GL_LINEAR_MIPMAP_NEAREST:
1810 sample_3d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
1811 lambda + minStart, rgba + minStart);
1812 break;
1813 case GL_NEAREST_MIPMAP_LINEAR:
1814 sample_3d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
1815 lambda + minStart, rgba + minStart);
1816 break;
1817 case GL_LINEAR_MIPMAP_LINEAR:
1818 sample_3d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
1819 lambda + minStart, rgba + minStart);
1820 break;
1821 default:
1822 _mesa_problem(ctx, "Bad min filter in sample_3d_texture");
1823 return;
1824 }
1825 }
1826
1827 if (magStart < magEnd) {
1828 /* do the magnified texels */
1829 switch (tObj->MagFilter) {
1830 case GL_NEAREST:
1831 for (i = magStart; i < magEnd; i++)
1832 sample_3d_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
1833 texcoords[i], rgba[i]);
1834 break;
1835 case GL_LINEAR:
1836 for (i = magStart; i < magEnd; i++)
1837 sample_3d_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
1838 texcoords[i], rgba[i]);
1839 break;
1840 default:
1841 _mesa_problem(ctx, "Bad mag filter in sample_3d_texture");
1842 return;
1843 }
1844 }
1845 }
1846
1847
1848 /**********************************************************************/
1849 /* Texture Cube Map Sampling Functions */
1850 /**********************************************************************/
1851
1852 /**
1853 * Choose one of six sides of a texture cube map given the texture
1854 * coord (rx,ry,rz). Return pointer to corresponding array of texture
1855 * images.
1856 */
1857 static const struct gl_texture_image **
1858 choose_cube_face(const struct gl_texture_object *texObj,
1859 const GLfloat texcoord[4], GLfloat newCoord[4])
1860 {
1861 /*
1862 major axis
1863 direction target sc tc ma
1864 ---------- ------------------------------- --- --- ---
1865 +rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
1866 -rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
1867 +ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
1868 -ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
1869 +rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
1870 -rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
1871 */
1872 const GLfloat rx = texcoord[0];
1873 const GLfloat ry = texcoord[1];
1874 const GLfloat rz = texcoord[2];
1875 const GLfloat arx = FABSF(rx), ary = FABSF(ry), arz = FABSF(rz);
1876 GLuint face;
1877 GLfloat sc, tc, ma;
1878
1879 if (arx >= ary && arx >= arz) {
1880 if (rx >= 0.0F) {
1881 face = FACE_POS_X;
1882 sc = -rz;
1883 tc = -ry;
1884 ma = arx;
1885 }
1886 else {
1887 face = FACE_NEG_X;
1888 sc = rz;
1889 tc = -ry;
1890 ma = arx;
1891 }
1892 }
1893 else if (ary >= arx && ary >= arz) {
1894 if (ry >= 0.0F) {
1895 face = FACE_POS_Y;
1896 sc = rx;
1897 tc = rz;
1898 ma = ary;
1899 }
1900 else {
1901 face = FACE_NEG_Y;
1902 sc = rx;
1903 tc = -rz;
1904 ma = ary;
1905 }
1906 }
1907 else {
1908 if (rz > 0.0F) {
1909 face = FACE_POS_Z;
1910 sc = rx;
1911 tc = -ry;
1912 ma = arz;
1913 }
1914 else {
1915 face = FACE_NEG_Z;
1916 sc = -rx;
1917 tc = -ry;
1918 ma = arz;
1919 }
1920 }
1921
1922 {
1923 const float ima = 1.0F / ma;
1924 newCoord[0] = ( sc * ima + 1.0F ) * 0.5F;
1925 newCoord[1] = ( tc * ima + 1.0F ) * 0.5F;
1926 }
1927
1928 return (const struct gl_texture_image **) texObj->Image[face];
1929 }
1930
1931
1932 static void
1933 sample_nearest_cube(GLcontext *ctx,
1934 const struct gl_texture_object *tObj, GLuint n,
1935 const GLfloat texcoords[][4], const GLfloat lambda[],
1936 GLfloat rgba[][4])
1937 {
1938 GLuint i;
1939 (void) lambda;
1940 for (i = 0; i < n; i++) {
1941 const struct gl_texture_image **images;
1942 GLfloat newCoord[4];
1943 images = choose_cube_face(tObj, texcoords[i], newCoord);
1944 sample_2d_nearest(ctx, tObj, images[tObj->BaseLevel],
1945 newCoord, rgba[i]);
1946 }
1947 }
1948
1949
1950 static void
1951 sample_linear_cube(GLcontext *ctx,
1952 const struct gl_texture_object *tObj, GLuint n,
1953 const GLfloat texcoords[][4],
1954 const GLfloat lambda[], GLfloat rgba[][4])
1955 {
1956 GLuint i;
1957 (void) lambda;
1958 for (i = 0; i < n; i++) {
1959 const struct gl_texture_image **images;
1960 GLfloat newCoord[4];
1961 images = choose_cube_face(tObj, texcoords[i], newCoord);
1962 sample_2d_linear(ctx, tObj, images[tObj->BaseLevel],
1963 newCoord, rgba[i]);
1964 }
1965 }
1966
1967
1968 static void
1969 sample_cube_nearest_mipmap_nearest(GLcontext *ctx,
1970 const struct gl_texture_object *tObj,
1971 GLuint n, const GLfloat texcoord[][4],
1972 const GLfloat lambda[], GLfloat rgba[][4])
1973 {
1974 GLuint i;
1975 ASSERT(lambda != NULL);
1976 for (i = 0; i < n; i++) {
1977 const struct gl_texture_image **images;
1978 GLfloat newCoord[4];
1979 GLint level;
1980 images = choose_cube_face(tObj, texcoord[i], newCoord);
1981
1982 /* XXX we actually need to recompute lambda here based on the newCoords.
1983 * But we would need the texcoords of adjacent fragments to compute that
1984 * properly, and we don't have those here.
1985 * For now, do an approximation: subtracting 1 from the chosen mipmap
1986 * level seems to work in some test cases.
1987 * The same adjustment is done in the next few functions.
1988 */
1989 level = nearest_mipmap_level(tObj, lambda[i]);
1990 level = MAX2(level - 1, 0);
1991
1992 sample_2d_nearest(ctx, tObj, images[level], newCoord, rgba[i]);
1993 }
1994 }
1995
1996
1997 static void
1998 sample_cube_linear_mipmap_nearest(GLcontext *ctx,
1999 const struct gl_texture_object *tObj,
2000 GLuint n, const GLfloat texcoord[][4],
2001 const GLfloat lambda[], GLfloat rgba[][4])
2002 {
2003 GLuint i;
2004 ASSERT(lambda != NULL);
2005 for (i = 0; i < n; i++) {
2006 const struct gl_texture_image **images;
2007 GLfloat newCoord[4];
2008 GLint level = nearest_mipmap_level(tObj, lambda[i]);
2009 level = MAX2(level - 1, 0); /* see comment above */
2010 images = choose_cube_face(tObj, texcoord[i], newCoord);
2011 sample_2d_linear(ctx, tObj, images[level], newCoord, rgba[i]);
2012 }
2013 }
2014
2015
2016 static void
2017 sample_cube_nearest_mipmap_linear(GLcontext *ctx,
2018 const struct gl_texture_object *tObj,
2019 GLuint n, const GLfloat texcoord[][4],
2020 const GLfloat lambda[], GLfloat rgba[][4])
2021 {
2022 GLuint i;
2023 ASSERT(lambda != NULL);
2024 for (i = 0; i < n; i++) {
2025 const struct gl_texture_image **images;
2026 GLfloat newCoord[4];
2027 GLint level = linear_mipmap_level(tObj, lambda[i]);
2028 level = MAX2(level - 1, 0); /* see comment above */
2029 images = choose_cube_face(tObj, texcoord[i], newCoord);
2030 if (level >= tObj->_MaxLevel) {
2031 sample_2d_nearest(ctx, tObj, images[tObj->_MaxLevel],
2032 newCoord, rgba[i]);
2033 }
2034 else {
2035 GLfloat t0[4], t1[4]; /* texels */
2036 const GLfloat f = FRAC(lambda[i]);
2037 sample_2d_nearest(ctx, tObj, images[level ], newCoord, t0);
2038 sample_2d_nearest(ctx, tObj, images[level+1], newCoord, t1);
2039 lerp_rgba(rgba[i], f, t0, t1);
2040 }
2041 }
2042 }
2043
2044
2045 static void
2046 sample_cube_linear_mipmap_linear(GLcontext *ctx,
2047 const struct gl_texture_object *tObj,
2048 GLuint n, const GLfloat texcoord[][4],
2049 const GLfloat lambda[], GLfloat rgba[][4])
2050 {
2051 GLuint i;
2052 ASSERT(lambda != NULL);
2053 for (i = 0; i < n; i++) {
2054 const struct gl_texture_image **images;
2055 GLfloat newCoord[4];
2056 GLint level = linear_mipmap_level(tObj, lambda[i]);
2057 level = MAX2(level - 1, 0); /* see comment above */
2058 images = choose_cube_face(tObj, texcoord[i], newCoord);
2059 if (level >= tObj->_MaxLevel) {
2060 sample_2d_linear(ctx, tObj, images[tObj->_MaxLevel],
2061 newCoord, rgba[i]);
2062 }
2063 else {
2064 GLfloat t0[4], t1[4];
2065 const GLfloat f = FRAC(lambda[i]);
2066 sample_2d_linear(ctx, tObj, images[level ], newCoord, t0);
2067 sample_2d_linear(ctx, tObj, images[level+1], newCoord, t1);
2068 lerp_rgba(rgba[i], f, t0, t1);
2069 }
2070 }
2071 }
2072
2073
2074 /** Sample cube texture, using lambda to choose between min/magnification */
2075 static void
2076 sample_lambda_cube(GLcontext *ctx,
2077 const struct gl_texture_object *tObj, GLuint n,
2078 const GLfloat texcoords[][4], const GLfloat lambda[],
2079 GLfloat rgba[][4])
2080 {
2081 GLuint minStart, minEnd; /* texels with minification */
2082 GLuint magStart, magEnd; /* texels with magnification */
2083
2084 ASSERT(lambda != NULL);
2085 compute_min_mag_ranges(tObj, n, lambda,
2086 &minStart, &minEnd, &magStart, &magEnd);
2087
2088 if (minStart < minEnd) {
2089 /* do the minified texels */
2090 const GLuint m = minEnd - minStart;
2091 switch (tObj->MinFilter) {
2092 case GL_NEAREST:
2093 sample_nearest_cube(ctx, tObj, m, texcoords + minStart,
2094 lambda + minStart, rgba + minStart);
2095 break;
2096 case GL_LINEAR:
2097 sample_linear_cube(ctx, tObj, m, texcoords + minStart,
2098 lambda + minStart, rgba + minStart);
2099 break;
2100 case GL_NEAREST_MIPMAP_NEAREST:
2101 sample_cube_nearest_mipmap_nearest(ctx, tObj, m,
2102 texcoords + minStart,
2103 lambda + minStart, rgba + minStart);
2104 break;
2105 case GL_LINEAR_MIPMAP_NEAREST:
2106 sample_cube_linear_mipmap_nearest(ctx, tObj, m,
2107 texcoords + minStart,
2108 lambda + minStart, rgba + minStart);
2109 break;
2110 case GL_NEAREST_MIPMAP_LINEAR:
2111 sample_cube_nearest_mipmap_linear(ctx, tObj, m,
2112 texcoords + minStart,
2113 lambda + minStart, rgba + minStart);
2114 break;
2115 case GL_LINEAR_MIPMAP_LINEAR:
2116 sample_cube_linear_mipmap_linear(ctx, tObj, m,
2117 texcoords + minStart,
2118 lambda + minStart, rgba + minStart);
2119 break;
2120 default:
2121 _mesa_problem(ctx, "Bad min filter in sample_lambda_cube");
2122 }
2123 }
2124
2125 if (magStart < magEnd) {
2126 /* do the magnified texels */
2127 const GLuint m = magEnd - magStart;
2128 switch (tObj->MagFilter) {
2129 case GL_NEAREST:
2130 sample_nearest_cube(ctx, tObj, m, texcoords + magStart,
2131 lambda + magStart, rgba + magStart);
2132 break;
2133 case GL_LINEAR:
2134 sample_linear_cube(ctx, tObj, m, texcoords + magStart,
2135 lambda + magStart, rgba + magStart);
2136 break;
2137 default:
2138 _mesa_problem(ctx, "Bad mag filter in sample_lambda_cube");
2139 }
2140 }
2141 }
2142
2143
2144 /**********************************************************************/
2145 /* Texture Rectangle Sampling Functions */
2146 /**********************************************************************/
2147
2148
2149 static void
2150 sample_nearest_rect(GLcontext *ctx,
2151 const struct gl_texture_object *tObj, GLuint n,
2152 const GLfloat texcoords[][4], const GLfloat lambda[],
2153 GLfloat rgba[][4])
2154 {
2155 const struct gl_texture_image *img = tObj->Image[0][0];
2156 const GLint width = img->Width;
2157 const GLint height = img->Height;
2158 GLuint i;
2159
2160 (void) ctx;
2161 (void) lambda;
2162
2163 ASSERT(tObj->WrapS == GL_CLAMP ||
2164 tObj->WrapS == GL_CLAMP_TO_EDGE ||
2165 tObj->WrapS == GL_CLAMP_TO_BORDER);
2166 ASSERT(tObj->WrapT == GL_CLAMP ||
2167 tObj->WrapT == GL_CLAMP_TO_EDGE ||
2168 tObj->WrapT == GL_CLAMP_TO_BORDER);
2169 ASSERT(img->_BaseFormat != GL_COLOR_INDEX);
2170
2171 for (i = 0; i < n; i++) {
2172 GLint row, col;
2173 col = clamp_rect_coord_nearest(tObj->WrapS, texcoords[i][0], width);
2174 row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height);
2175 if (col < 0 || col >= width || row < 0 || row >= height)
2176 get_border_color(tObj, img, rgba[i]);
2177 else
2178 img->FetchTexelf(img, col, row, 0, rgba[i]);
2179 }
2180 }
2181
2182
2183 static void
2184 sample_linear_rect(GLcontext *ctx,
2185 const struct gl_texture_object *tObj, GLuint n,
2186 const GLfloat texcoords[][4],
2187 const GLfloat lambda[], GLfloat rgba[][4])
2188 {
2189 const struct gl_texture_image *img = tObj->Image[0][0];
2190 const GLint width = img->Width;
2191 const GLint height = img->Height;
2192 GLuint i;
2193
2194 (void) ctx;
2195 (void) lambda;
2196
2197 ASSERT(tObj->WrapS == GL_CLAMP ||
2198 tObj->WrapS == GL_CLAMP_TO_EDGE ||
2199 tObj->WrapS == GL_CLAMP_TO_BORDER);
2200 ASSERT(tObj->WrapT == GL_CLAMP ||
2201 tObj->WrapT == GL_CLAMP_TO_EDGE ||
2202 tObj->WrapT == GL_CLAMP_TO_BORDER);
2203 ASSERT(img->_BaseFormat != GL_COLOR_INDEX);
2204
2205 for (i = 0; i < n; i++) {
2206 GLint i0, j0, i1, j1;
2207 GLfloat t00[4], t01[4], t10[4], t11[4];
2208 GLfloat a, b;
2209 GLbitfield useBorderColor = 0x0;
2210
2211 clamp_rect_coord_linear(tObj->WrapS, texcoords[i][0], width,
2212 &i0, &i1, &a);
2213 clamp_rect_coord_linear(tObj->WrapT, texcoords[i][1], height,
2214 &j0, &j1, &b);
2215
2216 /* compute integer rows/columns */
2217 if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
2218 if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
2219 if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT;
2220 if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT;
2221
2222 /* get four texel samples */
2223 if (useBorderColor & (I0BIT | J0BIT))
2224 get_border_color(tObj, img, t00);
2225 else
2226 img->FetchTexelf(img, i0, j0, 0, t00);
2227
2228 if (useBorderColor & (I1BIT | J0BIT))
2229 get_border_color(tObj, img, t10);
2230 else
2231 img->FetchTexelf(img, i1, j0, 0, t10);
2232
2233 if (useBorderColor & (I0BIT | J1BIT))
2234 get_border_color(tObj, img, t01);
2235 else
2236 img->FetchTexelf(img, i0, j1, 0, t01);
2237
2238 if (useBorderColor & (I1BIT | J1BIT))
2239 get_border_color(tObj, img, t11);
2240 else
2241 img->FetchTexelf(img, i1, j1, 0, t11);
2242
2243 lerp_rgba_2d(rgba[i], a, b, t00, t10, t01, t11);
2244 }
2245 }
2246
2247
2248 /** Sample Rect texture, using lambda to choose between min/magnification */
2249 static void
2250 sample_lambda_rect(GLcontext *ctx,
2251 const struct gl_texture_object *tObj, GLuint n,
2252 const GLfloat texcoords[][4], const GLfloat lambda[],
2253 GLfloat rgba[][4])
2254 {
2255 GLuint minStart, minEnd, magStart, magEnd;
2256
2257 /* We only need lambda to decide between minification and magnification.
2258 * There is no mipmapping with rectangular textures.
2259 */
2260 compute_min_mag_ranges(tObj, n, lambda,
2261 &minStart, &minEnd, &magStart, &magEnd);
2262
2263 if (minStart < minEnd) {
2264 if (tObj->MinFilter == GL_NEAREST) {
2265 sample_nearest_rect(ctx, tObj, minEnd - minStart,
2266 texcoords + minStart, NULL, rgba + minStart);
2267 }
2268 else {
2269 sample_linear_rect(ctx, tObj, minEnd - minStart,
2270 texcoords + minStart, NULL, rgba + minStart);
2271 }
2272 }
2273 if (magStart < magEnd) {
2274 if (tObj->MagFilter == GL_NEAREST) {
2275 sample_nearest_rect(ctx, tObj, magEnd - magStart,
2276 texcoords + magStart, NULL, rgba + magStart);
2277 }
2278 else {
2279 sample_linear_rect(ctx, tObj, magEnd - magStart,
2280 texcoords + magStart, NULL, rgba + magStart);
2281 }
2282 }
2283 }
2284
2285
2286 /**********************************************************************/
2287 /* 2D Texture Array Sampling Functions */
2288 /**********************************************************************/
2289
2290 /**
2291 * Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
2292 */
2293 static void
2294 sample_2d_array_nearest(GLcontext *ctx,
2295 const struct gl_texture_object *tObj,
2296 const struct gl_texture_image *img,
2297 const GLfloat texcoord[4],
2298 GLfloat rgba[4])
2299 {
2300 const GLint width = img->Width2; /* without border, power of two */
2301 const GLint height = img->Height2; /* without border, power of two */
2302 const GLint depth = img->Depth;
2303 GLint i, j;
2304 GLint array;
2305 (void) ctx;
2306
2307 i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
2308 j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]);
2309 array = tex_array_slice(texcoord[2], depth);
2310
2311 if (i < 0 || i >= (GLint) img->Width ||
2312 j < 0 || j >= (GLint) img->Height ||
2313 array < 0 || array >= (GLint) img->Depth) {
2314 /* Need this test for GL_CLAMP_TO_BORDER mode */
2315 get_border_color(tObj, img, rgba);
2316 }
2317 else {
2318 img->FetchTexelf(img, i, j, array, rgba);
2319 }
2320 }
2321
2322
2323 /**
2324 * Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter.
2325 */
2326 static void
2327 sample_2d_array_linear(GLcontext *ctx,
2328 const struct gl_texture_object *tObj,
2329 const struct gl_texture_image *img,
2330 const GLfloat texcoord[4],
2331 GLfloat rgba[4])
2332 {
2333 const GLint width = img->Width2;
2334 const GLint height = img->Height2;
2335 const GLint depth = img->Depth;
2336 GLint i0, j0, i1, j1;
2337 GLint array;
2338 GLbitfield useBorderColor = 0x0;
2339 GLfloat a, b;
2340 GLfloat t00[4], t01[4], t10[4], t11[4];
2341
2342 linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
2343 linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b);
2344 array = tex_array_slice(texcoord[2], depth);
2345
2346 if (array < 0 || array >= depth) {
2347 COPY_4V(rgba, tObj->BorderColor.f);
2348 }
2349 else {
2350 if (img->Border) {
2351 i0 += img->Border;
2352 i1 += img->Border;
2353 j0 += img->Border;
2354 j1 += img->Border;
2355 }
2356 else {
2357 /* check if sampling texture border color */
2358 if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
2359 if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
2360 if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT;
2361 if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT;
2362 }
2363
2364 /* Fetch texels */
2365 if (useBorderColor & (I0BIT | J0BIT)) {
2366 get_border_color(tObj, img, t00);
2367 }
2368 else {
2369 img->FetchTexelf(img, i0, j0, array, t00);
2370 }
2371 if (useBorderColor & (I1BIT | J0BIT)) {
2372 get_border_color(tObj, img, t10);
2373 }
2374 else {
2375 img->FetchTexelf(img, i1, j0, array, t10);
2376 }
2377 if (useBorderColor & (I0BIT | J1BIT)) {
2378 get_border_color(tObj, img, t01);
2379 }
2380 else {
2381 img->FetchTexelf(img, i0, j1, array, t01);
2382 }
2383 if (useBorderColor & (I1BIT | J1BIT)) {
2384 get_border_color(tObj, img, t11);
2385 }
2386 else {
2387 img->FetchTexelf(img, i1, j1, array, t11);
2388 }
2389
2390 /* trilinear interpolation of samples */
2391 lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11);
2392 }
2393 }
2394
2395
2396 static void
2397 sample_2d_array_nearest_mipmap_nearest(GLcontext *ctx,
2398 const struct gl_texture_object *tObj,
2399 GLuint n, const GLfloat texcoord[][4],
2400 const GLfloat lambda[], GLfloat rgba[][4])
2401 {
2402 GLuint i;
2403 for (i = 0; i < n; i++) {
2404 GLint level = nearest_mipmap_level(tObj, lambda[i]);
2405 sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i],
2406 rgba[i]);
2407 }
2408 }
2409
2410
2411 static void
2412 sample_2d_array_linear_mipmap_nearest(GLcontext *ctx,
2413 const struct gl_texture_object *tObj,
2414 GLuint n, const GLfloat texcoord[][4],
2415 const GLfloat lambda[], GLfloat rgba[][4])
2416 {
2417 GLuint i;
2418 ASSERT(lambda != NULL);
2419 for (i = 0; i < n; i++) {
2420 GLint level = nearest_mipmap_level(tObj, lambda[i]);
2421 sample_2d_array_linear(ctx, tObj, tObj->Image[0][level],
2422 texcoord[i], rgba[i]);
2423 }
2424 }
2425
2426
2427 static void
2428 sample_2d_array_nearest_mipmap_linear(GLcontext *ctx,
2429 const struct gl_texture_object *tObj,
2430 GLuint n, const GLfloat texcoord[][4],
2431 const GLfloat lambda[], GLfloat rgba[][4])
2432 {
2433 GLuint i;
2434 ASSERT(lambda != NULL);
2435 for (i = 0; i < n; i++) {
2436 GLint level = linear_mipmap_level(tObj, lambda[i]);
2437 if (level >= tObj->_MaxLevel) {
2438 sample_2d_array_nearest(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
2439 texcoord[i], rgba[i]);
2440 }
2441 else {
2442 GLfloat t0[4], t1[4]; /* texels */
2443 const GLfloat f = FRAC(lambda[i]);
2444 sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level ],
2445 texcoord[i], t0);
2446 sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level+1],
2447 texcoord[i], t1);
2448 lerp_rgba(rgba[i], f, t0, t1);
2449 }
2450 }
2451 }
2452
2453
2454 static void
2455 sample_2d_array_linear_mipmap_linear(GLcontext *ctx,
2456 const struct gl_texture_object *tObj,
2457 GLuint n, const GLfloat texcoord[][4],
2458 const GLfloat lambda[], GLfloat rgba[][4])
2459 {
2460 GLuint i;
2461 ASSERT(lambda != NULL);
2462 for (i = 0; i < n; i++) {
2463 GLint level = linear_mipmap_level(tObj, lambda[i]);
2464 if (level >= tObj->_MaxLevel) {
2465 sample_2d_array_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
2466 texcoord[i], rgba[i]);
2467 }
2468 else {
2469 GLfloat t0[4], t1[4]; /* texels */
2470 const GLfloat f = FRAC(lambda[i]);
2471 sample_2d_array_linear(ctx, tObj, tObj->Image[0][level ],
2472 texcoord[i], t0);
2473 sample_2d_array_linear(ctx, tObj, tObj->Image[0][level+1],
2474 texcoord[i], t1);
2475 lerp_rgba(rgba[i], f, t0, t1);
2476 }
2477 }
2478 }
2479
2480
2481 /** Sample 2D Array texture, nearest filtering for both min/magnification */
2482 static void
2483 sample_nearest_2d_array(GLcontext *ctx,
2484 const struct gl_texture_object *tObj, GLuint n,
2485 const GLfloat texcoords[][4], const GLfloat lambda[],
2486 GLfloat rgba[][4])
2487 {
2488 GLuint i;
2489 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
2490 (void) lambda;
2491 for (i = 0; i < n; i++) {
2492 sample_2d_array_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
2493 }
2494 }
2495
2496
2497
2498 /** Sample 2D Array texture, linear filtering for both min/magnification */
2499 static void
2500 sample_linear_2d_array(GLcontext *ctx,
2501 const struct gl_texture_object *tObj, GLuint n,
2502 const GLfloat texcoords[][4],
2503 const GLfloat lambda[], GLfloat rgba[][4])
2504 {
2505 GLuint i;
2506 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
2507 (void) lambda;
2508 for (i = 0; i < n; i++) {
2509 sample_2d_array_linear(ctx, tObj, image, texcoords[i], rgba[i]);
2510 }
2511 }
2512
2513
2514 /** Sample 2D Array texture, using lambda to choose between min/magnification */
2515 static void
2516 sample_lambda_2d_array(GLcontext *ctx,
2517 const struct gl_texture_object *tObj, GLuint n,
2518 const GLfloat texcoords[][4], const GLfloat lambda[],
2519 GLfloat rgba[][4])
2520 {
2521 GLuint minStart, minEnd; /* texels with minification */
2522 GLuint magStart, magEnd; /* texels with magnification */
2523 GLuint i;
2524
2525 ASSERT(lambda != NULL);
2526 compute_min_mag_ranges(tObj, n, lambda,
2527 &minStart, &minEnd, &magStart, &magEnd);
2528
2529 if (minStart < minEnd) {
2530 /* do the minified texels */
2531 GLuint m = minEnd - minStart;
2532 switch (tObj->MinFilter) {
2533 case GL_NEAREST:
2534 for (i = minStart; i < minEnd; i++)
2535 sample_2d_array_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
2536 texcoords[i], rgba[i]);
2537 break;
2538 case GL_LINEAR:
2539 for (i = minStart; i < minEnd; i++)
2540 sample_2d_array_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
2541 texcoords[i], rgba[i]);
2542 break;
2543 case GL_NEAREST_MIPMAP_NEAREST:
2544 sample_2d_array_nearest_mipmap_nearest(ctx, tObj, m,
2545 texcoords + minStart,
2546 lambda + minStart,
2547 rgba + minStart);
2548 break;
2549 case GL_LINEAR_MIPMAP_NEAREST:
2550 sample_2d_array_linear_mipmap_nearest(ctx, tObj, m,
2551 texcoords + minStart,
2552 lambda + minStart,
2553 rgba + minStart);
2554 break;
2555 case GL_NEAREST_MIPMAP_LINEAR:
2556 sample_2d_array_nearest_mipmap_linear(ctx, tObj, m,
2557 texcoords + minStart,
2558 lambda + minStart,
2559 rgba + minStart);
2560 break;
2561 case GL_LINEAR_MIPMAP_LINEAR:
2562 sample_2d_array_linear_mipmap_linear(ctx, tObj, m,
2563 texcoords + minStart,
2564 lambda + minStart,
2565 rgba + minStart);
2566 break;
2567 default:
2568 _mesa_problem(ctx, "Bad min filter in sample_2d_array_texture");
2569 return;
2570 }
2571 }
2572
2573 if (magStart < magEnd) {
2574 /* do the magnified texels */
2575 switch (tObj->MagFilter) {
2576 case GL_NEAREST:
2577 for (i = magStart; i < magEnd; i++)
2578 sample_2d_array_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
2579 texcoords[i], rgba[i]);
2580 break;
2581 case GL_LINEAR:
2582 for (i = magStart; i < magEnd; i++)
2583 sample_2d_array_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
2584 texcoords[i], rgba[i]);
2585 break;
2586 default:
2587 _mesa_problem(ctx, "Bad mag filter in sample_2d_array_texture");
2588 return;
2589 }
2590 }
2591 }
2592
2593
2594
2595
2596 /**********************************************************************/
2597 /* 1D Texture Array Sampling Functions */
2598 /**********************************************************************/
2599
2600 /**
2601 * Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
2602 */
2603 static void
2604 sample_1d_array_nearest(GLcontext *ctx,
2605 const struct gl_texture_object *tObj,
2606 const struct gl_texture_image *img,
2607 const GLfloat texcoord[4],
2608 GLfloat rgba[4])
2609 {
2610 const GLint width = img->Width2; /* without border, power of two */
2611 const GLint height = img->Height;
2612 GLint i;
2613 GLint array;
2614 (void) ctx;
2615
2616 i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
2617 array = tex_array_slice(texcoord[1], height);
2618
2619 if (i < 0 || i >= (GLint) img->Width ||
2620 array < 0 || array >= (GLint) img->Height) {
2621 /* Need this test for GL_CLAMP_TO_BORDER mode */
2622 get_border_color(tObj, img, rgba);
2623 }
2624 else {
2625 img->FetchTexelf(img, i, array, 0, rgba);
2626 }
2627 }
2628
2629
2630 /**
2631 * Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter.
2632 */
2633 static void
2634 sample_1d_array_linear(GLcontext *ctx,
2635 const struct gl_texture_object *tObj,
2636 const struct gl_texture_image *img,
2637 const GLfloat texcoord[4],
2638 GLfloat rgba[4])
2639 {
2640 const GLint width = img->Width2;
2641 const GLint height = img->Height;
2642 GLint i0, i1;
2643 GLint array;
2644 GLbitfield useBorderColor = 0x0;
2645 GLfloat a;
2646 GLfloat t0[4], t1[4];
2647
2648 linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
2649 array = tex_array_slice(texcoord[1], height);
2650
2651 if (img->Border) {
2652 i0 += img->Border;
2653 i1 += img->Border;
2654 }
2655 else {
2656 /* check if sampling texture border color */
2657 if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
2658 if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
2659 }
2660
2661 if (array < 0 || array >= height) useBorderColor |= K0BIT;
2662
2663 /* Fetch texels */
2664 if (useBorderColor & (I0BIT | K0BIT)) {
2665 get_border_color(tObj, img, t0);
2666 }
2667 else {
2668 img->FetchTexelf(img, i0, array, 0, t0);
2669 }
2670 if (useBorderColor & (I1BIT | K0BIT)) {
2671 get_border_color(tObj, img, t1);
2672 }
2673 else {
2674 img->FetchTexelf(img, i1, array, 0, t1);
2675 }
2676
2677 /* bilinear interpolation of samples */
2678 lerp_rgba(rgba, a, t0, t1);
2679 }
2680
2681
2682 static void
2683 sample_1d_array_nearest_mipmap_nearest(GLcontext *ctx,
2684 const struct gl_texture_object *tObj,
2685 GLuint n, const GLfloat texcoord[][4],
2686 const GLfloat lambda[], GLfloat rgba[][4])
2687 {
2688 GLuint i;
2689 for (i = 0; i < n; i++) {
2690 GLint level = nearest_mipmap_level(tObj, lambda[i]);
2691 sample_1d_array_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i],
2692 rgba[i]);
2693 }
2694 }
2695
2696
2697 static void
2698 sample_1d_array_linear_mipmap_nearest(GLcontext *ctx,
2699 const struct gl_texture_object *tObj,
2700 GLuint n, const GLfloat texcoord[][4],
2701 const GLfloat lambda[], GLfloat rgba[][4])
2702 {
2703 GLuint i;
2704 ASSERT(lambda != NULL);
2705 for (i = 0; i < n; i++) {
2706 GLint level = nearest_mipmap_level(tObj, lambda[i]);
2707 sample_1d_array_linear(ctx, tObj, tObj->Image[0][level],
2708 texcoord[i], rgba[i]);
2709 }
2710 }
2711
2712
2713 static void
2714 sample_1d_array_nearest_mipmap_linear(GLcontext *ctx,
2715 const struct gl_texture_object *tObj,
2716 GLuint n, const GLfloat texcoord[][4],
2717 const GLfloat lambda[], GLfloat rgba[][4])
2718 {
2719 GLuint i;
2720 ASSERT(lambda != NULL);
2721 for (i = 0; i < n; i++) {
2722 GLint level = linear_mipmap_level(tObj, lambda[i]);
2723 if (level >= tObj->_MaxLevel) {
2724 sample_1d_array_nearest(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
2725 texcoord[i], rgba[i]);
2726 }
2727 else {
2728 GLfloat t0[4], t1[4]; /* texels */
2729 const GLfloat f = FRAC(lambda[i]);
2730 sample_1d_array_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
2731 sample_1d_array_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
2732 lerp_rgba(rgba[i], f, t0, t1);
2733 }
2734 }
2735 }
2736
2737
2738 static void
2739 sample_1d_array_linear_mipmap_linear(GLcontext *ctx,
2740 const struct gl_texture_object *tObj,
2741 GLuint n, const GLfloat texcoord[][4],
2742 const GLfloat lambda[], GLfloat rgba[][4])
2743 {
2744 GLuint i;
2745 ASSERT(lambda != NULL);
2746 for (i = 0; i < n; i++) {
2747 GLint level = linear_mipmap_level(tObj, lambda[i]);
2748 if (level >= tObj->_MaxLevel) {
2749 sample_1d_array_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
2750 texcoord[i], rgba[i]);
2751 }
2752 else {
2753 GLfloat t0[4], t1[4]; /* texels */
2754 const GLfloat f = FRAC(lambda[i]);
2755 sample_1d_array_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
2756 sample_1d_array_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
2757 lerp_rgba(rgba[i], f, t0, t1);
2758 }
2759 }
2760 }
2761
2762
2763 /** Sample 1D Array texture, nearest filtering for both min/magnification */
2764 static void
2765 sample_nearest_1d_array(GLcontext *ctx,
2766 const struct gl_texture_object *tObj, GLuint n,
2767 const GLfloat texcoords[][4], const GLfloat lambda[],
2768 GLfloat rgba[][4])
2769 {
2770 GLuint i;
2771 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
2772 (void) lambda;
2773 for (i = 0; i < n; i++) {
2774 sample_1d_array_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
2775 }
2776 }
2777
2778
2779 /** Sample 1D Array texture, linear filtering for both min/magnification */
2780 static void
2781 sample_linear_1d_array(GLcontext *ctx,
2782 const struct gl_texture_object *tObj, GLuint n,
2783 const GLfloat texcoords[][4],
2784 const GLfloat lambda[], GLfloat rgba[][4])
2785 {
2786 GLuint i;
2787 struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
2788 (void) lambda;
2789 for (i = 0; i < n; i++) {
2790 sample_1d_array_linear(ctx, tObj, image, texcoords[i], rgba[i]);
2791 }
2792 }
2793
2794
2795 /** Sample 1D Array texture, using lambda to choose between min/magnification */
2796 static void
2797 sample_lambda_1d_array(GLcontext *ctx,
2798 const struct gl_texture_object *tObj, GLuint n,
2799 const GLfloat texcoords[][4], const GLfloat lambda[],
2800 GLfloat rgba[][4])
2801 {
2802 GLuint minStart, minEnd; /* texels with minification */
2803 GLuint magStart, magEnd; /* texels with magnification */
2804 GLuint i;
2805
2806 ASSERT(lambda != NULL);
2807 compute_min_mag_ranges(tObj, n, lambda,
2808 &minStart, &minEnd, &magStart, &magEnd);
2809
2810 if (minStart < minEnd) {
2811 /* do the minified texels */
2812 GLuint m = minEnd - minStart;
2813 switch (tObj->MinFilter) {
2814 case GL_NEAREST:
2815 for (i = minStart; i < minEnd; i++)
2816 sample_1d_array_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
2817 texcoords[i], rgba[i]);
2818 break;
2819 case GL_LINEAR:
2820 for (i = minStart; i < minEnd; i++)
2821 sample_1d_array_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
2822 texcoords[i], rgba[i]);
2823 break;
2824 case GL_NEAREST_MIPMAP_NEAREST:
2825 sample_1d_array_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
2826 lambda + minStart, rgba + minStart);
2827 break;
2828 case GL_LINEAR_MIPMAP_NEAREST:
2829 sample_1d_array_linear_mipmap_nearest(ctx, tObj, m,
2830 texcoords + minStart,
2831 lambda + minStart,
2832 rgba + minStart);
2833 break;
2834 case GL_NEAREST_MIPMAP_LINEAR:
2835 sample_1d_array_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
2836 lambda + minStart, rgba + minStart);
2837 break;
2838 case GL_LINEAR_MIPMAP_LINEAR:
2839 sample_1d_array_linear_mipmap_linear(ctx, tObj, m,
2840 texcoords + minStart,
2841 lambda + minStart,
2842 rgba + minStart);
2843 break;
2844 default:
2845 _mesa_problem(ctx, "Bad min filter in sample_1d_array_texture");
2846 return;
2847 }
2848 }
2849
2850 if (magStart < magEnd) {
2851 /* do the magnified texels */
2852 switch (tObj->MagFilter) {
2853 case GL_NEAREST:
2854 for (i = magStart; i < magEnd; i++)
2855 sample_1d_array_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
2856 texcoords[i], rgba[i]);
2857 break;
2858 case GL_LINEAR:
2859 for (i = magStart; i < magEnd; i++)
2860 sample_1d_array_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
2861 texcoords[i], rgba[i]);
2862 break;
2863 default:
2864 _mesa_problem(ctx, "Bad mag filter in sample_1d_array_texture");
2865 return;
2866 }
2867 }
2868 }
2869
2870
2871 /**
2872 * Compare texcoord against depth sample. Return 1.0 or the ambient value.
2873 */
2874 static INLINE GLfloat
2875 shadow_compare(GLenum function, GLfloat coord, GLfloat depthSample,
2876 GLfloat ambient)
2877 {
2878 switch (function) {
2879 case GL_LEQUAL:
2880 return (coord <= depthSample) ? 1.0F : ambient;
2881 case GL_GEQUAL:
2882 return (coord >= depthSample) ? 1.0F : ambient;
2883 case GL_LESS:
2884 return (coord < depthSample) ? 1.0F : ambient;
2885 case GL_GREATER:
2886 return (coord > depthSample) ? 1.0F : ambient;
2887 case GL_EQUAL:
2888 return (coord == depthSample) ? 1.0F : ambient;
2889 case GL_NOTEQUAL:
2890 return (coord != depthSample) ? 1.0F : ambient;
2891 case GL_ALWAYS:
2892 return 1.0F;
2893 case GL_NEVER:
2894 return ambient;
2895 case GL_NONE:
2896 return depthSample;
2897 default:
2898 _mesa_problem(NULL, "Bad compare func in shadow_compare");
2899 return ambient;
2900 }
2901 }
2902
2903
2904 /**
2905 * Compare texcoord against four depth samples.
2906 */
2907 static INLINE GLfloat
2908 shadow_compare4(GLenum function, GLfloat coord,
2909 GLfloat depth00, GLfloat depth01,
2910 GLfloat depth10, GLfloat depth11,
2911 GLfloat ambient, GLfloat wi, GLfloat wj)
2912 {
2913 const GLfloat d = (1.0F - (GLfloat) ambient) * 0.25F;
2914 GLfloat luminance = 1.0F;
2915
2916 switch (function) {
2917 case GL_LEQUAL:
2918 if (depth00 <= coord) luminance -= d;
2919 if (depth01 <= coord) luminance -= d;
2920 if (depth10 <= coord) luminance -= d;
2921 if (depth11 <= coord) luminance -= d;
2922 return luminance;
2923 case GL_GEQUAL:
2924 if (depth00 >= coord) luminance -= d;
2925 if (depth01 >= coord) luminance -= d;
2926 if (depth10 >= coord) luminance -= d;
2927 if (depth11 >= coord) luminance -= d;
2928 return luminance;
2929 case GL_LESS:
2930 if (depth00 < coord) luminance -= d;
2931 if (depth01 < coord) luminance -= d;
2932 if (depth10 < coord) luminance -= d;
2933 if (depth11 < coord) luminance -= d;
2934 return luminance;
2935 case GL_GREATER:
2936 if (depth00 > coord) luminance -= d;
2937 if (depth01 > coord) luminance -= d;
2938 if (depth10 > coord) luminance -= d;
2939 if (depth11 > coord) luminance -= d;
2940 return luminance;
2941 case GL_EQUAL:
2942 if (depth00 == coord) luminance -= d;
2943 if (depth01 == coord) luminance -= d;
2944 if (depth10 == coord) luminance -= d;
2945 if (depth11 == coord) luminance -= d;
2946 return luminance;
2947 case GL_NOTEQUAL:
2948 if (depth00 != coord) luminance -= d;
2949 if (depth01 != coord) luminance -= d;
2950 if (depth10 != coord) luminance -= d;
2951 if (depth11 != coord) luminance -= d;
2952 return luminance;
2953 case GL_ALWAYS:
2954 return 0.0;
2955 case GL_NEVER:
2956 return ambient;
2957 case GL_NONE:
2958 /* ordinary bilinear filtering */
2959 return lerp_2d(wi, wj, depth00, depth10, depth01, depth11);
2960 default:
2961 _mesa_problem(NULL, "Bad compare func in sample_depth_texture");
2962 return 0.0F;
2963 }
2964 }
2965
2966
2967 /**
2968 * Choose the mipmap level to use when sampling from a depth texture.
2969 */
2970 static int
2971 choose_depth_texture_level(const struct gl_texture_object *tObj, GLfloat lambda)
2972 {
2973 GLint level;
2974
2975 lambda = CLAMP(lambda, tObj->MinLod, tObj->MaxLod);
2976
2977 level = (GLint) lambda;
2978
2979 level = CLAMP(level, tObj->BaseLevel, tObj->_MaxLevel);
2980
2981 return level;
2982 }
2983
2984
2985 /**
2986 * Sample a shadow/depth texture. This function is incomplete. It doesn't
2987 * check for minification vs. magnification, etc.
2988 */
2989 static void
2990 sample_depth_texture( GLcontext *ctx,
2991 const struct gl_texture_object *tObj, GLuint n,
2992 const GLfloat texcoords[][4], const GLfloat lambda[],
2993 GLfloat texel[][4] )
2994 {
2995 const GLint level = choose_depth_texture_level(tObj, lambda[0]);
2996 const struct gl_texture_image *img = tObj->Image[0][level];
2997 const GLint width = img->Width;
2998 const GLint height = img->Height;
2999 const GLint depth = img->Depth;
3000 const GLuint compare_coord = (tObj->Target == GL_TEXTURE_2D_ARRAY_EXT)
3001 ? 3 : 2;
3002 GLfloat ambient;
3003 GLenum function;
3004 GLfloat result;
3005
3006 ASSERT(img->_BaseFormat == GL_DEPTH_COMPONENT ||
3007 img->_BaseFormat == GL_DEPTH_STENCIL_EXT);
3008
3009 ASSERT(tObj->Target == GL_TEXTURE_1D ||
3010 tObj->Target == GL_TEXTURE_2D ||
3011 tObj->Target == GL_TEXTURE_RECTANGLE_NV ||
3012 tObj->Target == GL_TEXTURE_1D_ARRAY_EXT ||
3013 tObj->Target == GL_TEXTURE_2D_ARRAY_EXT);
3014
3015 ambient = tObj->CompareFailValue;
3016
3017 /* XXXX if tObj->MinFilter != tObj->MagFilter, we're ignoring lambda */
3018
3019 function = (tObj->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) ?
3020 tObj->CompareFunc : GL_NONE;
3021
3022 if (tObj->MagFilter == GL_NEAREST) {
3023 GLuint i;
3024 for (i = 0; i < n; i++) {
3025 GLfloat depthSample;
3026 GLint col, row, slice;
3027
3028 nearest_texcoord(tObj, level, texcoords[i], &col, &row, &slice);
3029
3030 if (col >= 0 && row >= 0 && col < width && row < height &&
3031 slice >= 0 && slice < depth) {
3032 img->FetchTexelf(img, col, row, slice, &depthSample);
3033 }
3034 else {
3035 depthSample = tObj->BorderColor.f[0];
3036 }
3037
3038 result = shadow_compare(function, texcoords[i][compare_coord],
3039 depthSample, ambient);
3040
3041 switch (tObj->DepthMode) {
3042 case GL_LUMINANCE:
3043 ASSIGN_4V(texel[i], result, result, result, 1.0F);
3044 break;
3045 case GL_INTENSITY:
3046 ASSIGN_4V(texel[i], result, result, result, result);
3047 break;
3048 case GL_ALPHA:
3049 ASSIGN_4V(texel[i], 0.0F, 0.0F, 0.0F, result);
3050 break;
3051 default:
3052 _mesa_problem(ctx, "Bad depth texture mode");
3053 }
3054 }
3055 }
3056 else {
3057 GLuint i;
3058 ASSERT(tObj->MagFilter == GL_LINEAR);
3059 for (i = 0; i < n; i++) {
3060 GLfloat depth00, depth01, depth10, depth11;
3061 GLint i0, i1, j0, j1;
3062 GLint slice;
3063 GLfloat wi, wj;
3064 GLuint useBorderTexel;
3065
3066 linear_texcoord(tObj, level, texcoords[i], &i0, &i1, &j0, &j1, &slice,
3067 &wi, &wj);
3068
3069 useBorderTexel = 0;
3070 if (img->Border) {
3071 i0 += img->Border;
3072 i1 += img->Border;
3073 if (tObj->Target != GL_TEXTURE_1D_ARRAY_EXT) {
3074 j0 += img->Border;
3075 j1 += img->Border;
3076 }
3077 }
3078 else {
3079 if (i0 < 0 || i0 >= (GLint) width) useBorderTexel |= I0BIT;
3080 if (i1 < 0 || i1 >= (GLint) width) useBorderTexel |= I1BIT;
3081 if (j0 < 0 || j0 >= (GLint) height) useBorderTexel |= J0BIT;
3082 if (j1 < 0 || j1 >= (GLint) height) useBorderTexel |= J1BIT;
3083 }
3084
3085 if (slice < 0 || slice >= (GLint) depth) {
3086 depth00 = tObj->BorderColor.f[0];
3087 depth01 = tObj->BorderColor.f[0];
3088 depth10 = tObj->BorderColor.f[0];
3089 depth11 = tObj->BorderColor.f[0];
3090 }
3091 else {
3092 /* get four depth samples from the texture */
3093 if (useBorderTexel & (I0BIT | J0BIT)) {
3094 depth00 = tObj->BorderColor.f[0];
3095 }
3096 else {
3097 img->FetchTexelf(img, i0, j0, slice, &depth00);
3098 }
3099 if (useBorderTexel & (I1BIT | J0BIT)) {
3100 depth10 = tObj->BorderColor.f[0];
3101 }
3102 else {
3103 img->FetchTexelf(img, i1, j0, slice, &depth10);
3104 }
3105
3106 if (tObj->Target != GL_TEXTURE_1D_ARRAY_EXT) {
3107 if (useBorderTexel & (I0BIT | J1BIT)) {
3108 depth01 = tObj->BorderColor.f[0];
3109 }
3110 else {
3111 img->FetchTexelf(img, i0, j1, slice, &depth01);
3112 }
3113 if (useBorderTexel & (I1BIT | J1BIT)) {
3114 depth11 = tObj->BorderColor.f[0];
3115 }
3116 else {
3117 img->FetchTexelf(img, i1, j1, slice, &depth11);
3118 }
3119 }
3120 else {
3121 depth01 = depth00;
3122 depth11 = depth10;
3123 }
3124 }
3125
3126 result = shadow_compare4(function, texcoords[i][compare_coord],
3127 depth00, depth01, depth10, depth11,
3128 ambient, wi, wj);
3129
3130 switch (tObj->DepthMode) {
3131 case GL_LUMINANCE:
3132 ASSIGN_4V(texel[i], result, result, result, 1.0F);
3133 break;
3134 case GL_INTENSITY:
3135 ASSIGN_4V(texel[i], result, result, result, result);
3136 break;
3137 case GL_ALPHA:
3138 ASSIGN_4V(texel[i], 0.0F, 0.0F, 0.0F, result);
3139 break;
3140 default:
3141 _mesa_problem(ctx, "Bad depth texture mode");
3142 }
3143
3144 } /* for */
3145 } /* if filter */
3146 }
3147
3148
3149 /**
3150 * We use this function when a texture object is in an "incomplete" state.
3151 * When a fragment program attempts to sample an incomplete texture we
3152 * return black (see issue 23 in GL_ARB_fragment_program spec).
3153 * Note: fragment programs don't observe the texture enable/disable flags.
3154 */
3155 static void
3156 null_sample_func( GLcontext *ctx,
3157 const struct gl_texture_object *tObj, GLuint n,
3158 const GLfloat texcoords[][4], const GLfloat lambda[],
3159 GLfloat rgba[][4])
3160 {
3161 GLuint i;
3162 (void) ctx;
3163 (void) tObj;
3164 (void) texcoords;
3165 (void) lambda;
3166 for (i = 0; i < n; i++) {
3167 rgba[i][RCOMP] = 0;
3168 rgba[i][GCOMP] = 0;
3169 rgba[i][BCOMP] = 0;
3170 rgba[i][ACOMP] = 1.0;
3171 }
3172 }
3173
3174
3175 /**
3176 * Choose the texture sampling function for the given texture object.
3177 */
3178 texture_sample_func
3179 _swrast_choose_texture_sample_func( GLcontext *ctx,
3180 const struct gl_texture_object *t )
3181 {
3182 if (!t || !t->_Complete) {
3183 return &null_sample_func;
3184 }
3185 else {
3186 const GLboolean needLambda = (GLboolean) (t->MinFilter != t->MagFilter);
3187 const GLenum format = t->Image[0][t->BaseLevel]->_BaseFormat;
3188
3189 switch (t->Target) {
3190 case GL_TEXTURE_1D:
3191 if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) {
3192 return &sample_depth_texture;
3193 }
3194 else if (needLambda) {
3195 return &sample_lambda_1d;
3196 }
3197 else if (t->MinFilter == GL_LINEAR) {
3198 return &sample_linear_1d;
3199 }
3200 else {
3201 ASSERT(t->MinFilter == GL_NEAREST);
3202 return &sample_nearest_1d;
3203 }
3204 case GL_TEXTURE_2D:
3205 if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) {
3206 return &sample_depth_texture;
3207 }
3208 else if (needLambda) {
3209 return &sample_lambda_2d;
3210 }
3211 else if (t->MinFilter == GL_LINEAR) {
3212 return &sample_linear_2d;
3213 }
3214 else {
3215 /* check for a few optimized cases */
3216 const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
3217 ASSERT(t->MinFilter == GL_NEAREST);
3218 if (t->WrapS == GL_REPEAT &&
3219 t->WrapT == GL_REPEAT &&
3220 img->_IsPowerOfTwo &&
3221 img->Border == 0 &&
3222 img->TexFormat == MESA_FORMAT_RGB888) {
3223 return &opt_sample_rgb_2d;
3224 }
3225 else if (t->WrapS == GL_REPEAT &&
3226 t->WrapT == GL_REPEAT &&
3227 img->_IsPowerOfTwo &&
3228 img->Border == 0 &&
3229 img->TexFormat == MESA_FORMAT_RGBA8888) {
3230 return &opt_sample_rgba_2d;
3231 }
3232 else {
3233 return &sample_nearest_2d;
3234 }
3235 }
3236 case GL_TEXTURE_3D:
3237 if (needLambda) {
3238 return &sample_lambda_3d;
3239 }
3240 else if (t->MinFilter == GL_LINEAR) {
3241 return &sample_linear_3d;
3242 }
3243 else {
3244 ASSERT(t->MinFilter == GL_NEAREST);
3245 return &sample_nearest_3d;
3246 }
3247 case GL_TEXTURE_CUBE_MAP:
3248 if (needLambda) {
3249 return &sample_lambda_cube;
3250 }
3251 else if (t->MinFilter == GL_LINEAR) {
3252 return &sample_linear_cube;
3253 }
3254 else {
3255 ASSERT(t->MinFilter == GL_NEAREST);
3256 return &sample_nearest_cube;
3257 }
3258 case GL_TEXTURE_RECTANGLE_NV:
3259 if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) {
3260 return &sample_depth_texture;
3261 }
3262 else if (needLambda) {
3263 return &sample_lambda_rect;
3264 }
3265 else if (t->MinFilter == GL_LINEAR) {
3266 return &sample_linear_rect;
3267 }
3268 else {
3269 ASSERT(t->MinFilter == GL_NEAREST);
3270 return &sample_nearest_rect;
3271 }
3272 case GL_TEXTURE_1D_ARRAY_EXT:
3273 if (needLambda) {
3274 return &sample_lambda_1d_array;
3275 }
3276 else if (t->MinFilter == GL_LINEAR) {
3277 return &sample_linear_1d_array;
3278 }
3279 else {
3280 ASSERT(t->MinFilter == GL_NEAREST);
3281 return &sample_nearest_1d_array;
3282 }
3283 case GL_TEXTURE_2D_ARRAY_EXT:
3284 if (needLambda) {
3285 return &sample_lambda_2d_array;
3286 }
3287 else if (t->MinFilter == GL_LINEAR) {
3288 return &sample_linear_2d_array;
3289 }
3290 else {
3291 ASSERT(t->MinFilter == GL_NEAREST);
3292 return &sample_nearest_2d_array;
3293 }
3294 default:
3295 _mesa_problem(ctx,
3296 "invalid target in _swrast_choose_texture_sample_func");
3297 return &null_sample_func;
3298 }
3299 }
3300 }