1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
35 #include "sp_context.h"
36 #include "sp_headers.h"
37 #include "sp_surface.h"
38 #include "sp_tex_sample.h"
39 #include "sp_tile_cache.h"
40 #include "pipe/p_context.h"
41 #include "pipe/p_defines.h"
42 #include "pipe/p_util.h"
43 #include "tgsi/exec/tgsi_exec.h"
47 * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
48 * see 1-pixel bands of improperly weighted linear-filtered textures.
49 * The tests/texwrap.c demo is a good test.
50 * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
51 * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
53 #define FRAC(f) ((f) - ifloor(f))
57 * Linear interpolation macro
59 #define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) )
63 * Do 2D/biliner interpolation of float values.
64 * v00, v10, v01 and v11 are typically four texture samples in a square/box.
65 * a and b are the horizontal and vertical interpolants.
66 * It's important that this function is inlined when compiled with
67 * optimization! If we find that's not true on some systems, convert
71 lerp_2d(float a
, float b
,
72 float v00
, float v10
, float v01
, float v11
)
74 const float temp0
= LERP(a
, v00
, v10
);
75 const float temp1
= LERP(a
, v01
, v11
);
76 return LERP(b
, temp0
, temp1
);
81 * If A is a signed integer, A % B doesn't give the right value for A < 0
82 * (in terms of texture repeat). Just casting to unsigned fixes that.
84 #define REMAINDER(A, B) ((unsigned) (A) % (unsigned) (B))
88 * Apply texture coord wrapping mode and return integer texture index.
89 * \param wrapMode PIPE_TEX_WRAP_x
90 * \param s the texcoord
91 * \param size the texture image size
92 * \return integer texture index
95 nearest_texcoord(unsigned wrapMode
, float s
, unsigned size
)
99 case PIPE_TEX_WRAP_REPEAT
:
100 /* s limited to [0,1) */
101 /* i limited to [0,size-1] */
102 i
= ifloor(s
* size
);
103 i
= REMAINDER(i
, size
);
105 case PIPE_TEX_WRAP_CLAMP
:
106 /* s limited to [0,1] */
107 /* i limited to [0,size-1] */
113 i
= ifloor(s
* size
);
115 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
117 /* s limited to [min,max] */
118 /* i limited to [0, size-1] */
119 const float min
= 1.0F
/ (2.0F
* size
);
120 const float max
= 1.0F
- min
;
126 i
= ifloor(s
* size
);
129 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
131 /* s limited to [min,max] */
132 /* i limited to [-1, size] */
133 const float min
= -1.0F
/ (2.0F
* size
);
134 const float max
= 1.0F
- min
;
140 i
= ifloor(s
* size
);
143 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
145 const float min
= 1.0F
/ (2.0F
* size
);
146 const float max
= 1.0F
- min
;
147 const int flr
= ifloor(s
);
150 u
= 1.0F
- (s
- (float) flr
);
158 i
= ifloor(u
* size
);
161 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
163 /* s limited to [0,1] */
164 /* i limited to [0,size-1] */
165 const float u
= FABSF(s
);
171 i
= ifloor(u
* size
);
174 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
176 /* s limited to [min,max] */
177 /* i limited to [0, size-1] */
178 const float min
= 1.0F
/ (2.0F
* size
);
179 const float max
= 1.0F
- min
;
180 const float u
= FABSF(s
);
186 i
= ifloor(u
* size
);
189 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
191 /* s limited to [min,max] */
192 /* i limited to [0, size-1] */
193 const float min
= -1.0F
/ (2.0F
* size
);
194 const float max
= 1.0F
- min
;
195 const float u
= FABSF(s
);
201 i
= ifloor(u
* size
);
212 * Used to compute texel locations for linear sampling.
213 * \param wrapMode PIPE_TEX_WRAP_x
214 * \param s the texcoord
215 * \param size the texture image size
216 * \param i0 returns first texture index
217 * \param i1 returns second texture index (usually *i0 + 1)
218 * \param a returns blend factor/weight between texture indexes
221 linear_texcoord(unsigned wrapMode
, float s
, unsigned size
,
222 int *i0
, int *i1
, float *a
)
226 case PIPE_TEX_WRAP_REPEAT
:
228 *i0
= REMAINDER(ifloor(u
), size
);
229 *i1
= REMAINDER(*i0
+ 1, size
);
231 case PIPE_TEX_WRAP_CLAMP
:
242 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
254 if (*i1
>= (int) size
)
257 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
259 const float min
= -1.0F
/ (2.0F
* size
);
260 const float max
= 1.0F
- min
;
272 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
274 const int flr
= ifloor(s
);
276 u
= 1.0F
- (s
- (float) flr
);
279 u
= (u
* size
) - 0.5F
;
284 if (*i1
>= (int) size
)
288 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
298 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
309 if (*i1
>= (int) size
)
312 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
314 const float min
= -1.0F
/ (2.0F
* size
);
315 const float max
= 1.0F
- min
;
336 * For RECT textures / unnormalized texcoords
337 * Only a subset of wrap modes supported.
340 nearest_texcoord_unnorm(unsigned wrapMode
, float s
, unsigned size
)
344 case PIPE_TEX_WRAP_CLAMP
:
346 return CLAMP(i
, 0, (int) size
-1);
347 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
349 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
350 return ifloor( CLAMP(s
, 0.5F
, (float) size
- 0.5F
) );
359 * For RECT textures / unnormalized texcoords.
360 * Only a subset of wrap modes supported.
363 linear_texcoord_unnorm(unsigned wrapMode
, float s
, unsigned size
,
364 int *i0
, int *i1
, float *a
)
367 case PIPE_TEX_WRAP_CLAMP
:
368 /* Not exactly what the spec says, but it matches NVIDIA output */
369 s
= CLAMP(s
- 0.5F
, 0.0f
, (float) size
- 1.0f
);
373 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
375 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
376 s
= CLAMP(s
, 0.5F
, (float) size
- 0.5F
);
380 if (*i1
> (int) size
- 1)
391 choose_cube_face(float rx
, float ry
, float rz
, float *newS
, float *newT
)
395 direction target sc tc ma
396 ---------- ------------------------------- --- --- ---
397 +rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
398 -rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
399 +ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
400 -ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
401 +rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
402 -rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
404 const float arx
= FABSF(rx
), ary
= FABSF(ry
), arz
= FABSF(rz
);
408 if (arx
> ary
&& arx
> arz
) {
410 face
= PIPE_TEX_FACE_POS_X
;
416 face
= PIPE_TEX_FACE_NEG_X
;
422 else if (ary
> arx
&& ary
> arz
) {
424 face
= PIPE_TEX_FACE_POS_Y
;
430 face
= PIPE_TEX_FACE_NEG_Y
;
438 face
= PIPE_TEX_FACE_POS_Z
;
444 face
= PIPE_TEX_FACE_NEG_Z
;
451 *newS
= ( sc
/ ma
+ 1.0F
) * 0.5F
;
452 *newT
= ( tc
/ ma
+ 1.0F
) * 0.5F
;
459 * Examine the quad's texture coordinates to compute the partial
460 * derivatives w.r.t X and Y, then compute lambda (level of detail).
462 * This is only done for fragment shaders, not vertex shaders.
465 compute_lambda(struct tgsi_sampler
*sampler
,
466 const float s
[QUAD_SIZE
],
467 const float t
[QUAD_SIZE
],
468 const float p
[QUAD_SIZE
],
473 assert(sampler
->state
->normalized_coords
);
477 float dsdx
= s
[QUAD_BOTTOM_RIGHT
] - s
[QUAD_BOTTOM_LEFT
];
478 float dsdy
= s
[QUAD_TOP_LEFT
] - s
[QUAD_BOTTOM_LEFT
];
481 rho
= MAX2(dsdx
, dsdy
) * sampler
->texture
->width
[0];
484 float dtdx
= t
[QUAD_BOTTOM_RIGHT
] - t
[QUAD_BOTTOM_LEFT
];
485 float dtdy
= t
[QUAD_TOP_LEFT
] - t
[QUAD_BOTTOM_LEFT
];
489 max
= MAX2(dtdx
, dtdy
) * sampler
->texture
->height
[0];
490 rho
= MAX2(rho
, max
);
493 float dpdx
= p
[QUAD_BOTTOM_RIGHT
] - p
[QUAD_BOTTOM_LEFT
];
494 float dpdy
= p
[QUAD_TOP_LEFT
] - p
[QUAD_BOTTOM_LEFT
];
498 max
= MAX2(dpdx
, dpdy
) * sampler
->texture
->depth
[0];
499 rho
= MAX2(rho
, max
);
503 lambda
+= lodbias
+ sampler
->state
->lod_bias
;
504 lambda
= CLAMP(lambda
, sampler
->state
->min_lod
, sampler
->state
->max_lod
);
511 * Do several things here:
512 * 1. Compute lambda from the texcoords, if needed
513 * 2. Determine if we're minifying or magnifying
514 * 3. If minifying, choose mipmap levels
515 * 4. Return image filter to use within mipmap images
518 choose_mipmap_levels(struct tgsi_sampler
*sampler
,
519 const float s
[QUAD_SIZE
],
520 const float t
[QUAD_SIZE
],
521 const float p
[QUAD_SIZE
],
523 unsigned *level0
, unsigned *level1
, float *levelBlend
,
526 if (sampler
->state
->min_mip_filter
== PIPE_TEX_MIPFILTER_NONE
) {
527 /* no mipmap selection needed */
528 *level0
= *level1
= CLAMP((int) sampler
->state
->min_lod
,
529 0, (int) sampler
->texture
->last_level
);
531 if (sampler
->state
->min_img_filter
!= sampler
->state
->mag_img_filter
) {
532 /* non-mipmapped texture, but still need to determine if doing
533 * minification or magnification.
535 float lambda
= compute_lambda(sampler
, s
, t
, p
, lodbias
);
537 *imgFilter
= sampler
->state
->mag_img_filter
;
540 *imgFilter
= sampler
->state
->min_img_filter
;
544 *imgFilter
= sampler
->state
->mag_img_filter
;
551 /* fragment shader */
552 lambda
= compute_lambda(sampler
, s
, t
, p
, lodbias
);
555 lambda
= lodbias
; /* not really a bias, but absolute LOD */
557 if (lambda
<= 0.0) { /* XXX threshold depends on the filter */
559 *imgFilter
= sampler
->state
->mag_img_filter
;
560 *level0
= *level1
= 0;
564 *imgFilter
= sampler
->state
->min_img_filter
;
566 /* choose mipmap level(s) and compute the blend factor between them */
567 if (sampler
->state
->min_mip_filter
== PIPE_TEX_MIPFILTER_NEAREST
) {
568 /* Nearest mipmap level */
569 const int lvl
= (int) (lambda
+ 0.5);
571 *level1
= CLAMP(lvl
, 0, (int) sampler
->texture
->last_level
);
574 /* Linear interpolation between mipmap levels */
575 const int lvl
= (int) lambda
;
576 *level0
= CLAMP(lvl
, 0, (int) sampler
->texture
->last_level
);
577 *level1
= CLAMP(lvl
+ 1, 0, (int) sampler
->texture
->last_level
);
578 *levelBlend
= FRAC(lambda
); /* blending weight between levels */
586 * Get a texel from a texture, using the texture tile cache.
588 * \param face the cube face in 0..5
589 * \param level the mipmap level
590 * \param x the x coord of texel within 2D image
591 * \param y the y coord of texel within 2D image
592 * \param z which slice of a 3D texture
593 * \param rgba the quad to put the texel/color into
594 * \param j which element of the rgba quad to write to
596 * XXX maybe move this into sp_tile_cache.c and merge with the
597 * sp_get_cached_tile_tex() function. Also, get 4 texels instead of 1...
600 get_texel(struct tgsi_sampler
*sampler
,
601 unsigned face
, unsigned level
, int x
, int y
, int z
,
602 float rgba
[NUM_CHANNELS
][QUAD_SIZE
], unsigned j
)
604 const int tx
= x
% TILE_SIZE
;
605 const int ty
= y
% TILE_SIZE
;
606 const struct softpipe_cached_tile
*tile
607 = sp_get_cached_tile_tex(sampler
->pipe
, sampler
->cache
,
608 x
, y
, z
, face
, level
);
609 rgba
[0][j
] = tile
->data
.color
[ty
][tx
][0];
610 rgba
[1][j
] = tile
->data
.color
[ty
][tx
][1];
611 rgba
[2][j
] = tile
->data
.color
[ty
][tx
][2];
612 rgba
[3][j
] = tile
->data
.color
[ty
][tx
][3];
617 * Compare texcoord 'p' (aka R) against texture value 'rgba[0]'
618 * When we sampled the depth texture, the depth value was put into all
619 * RGBA channels. We look at the red channel here.
622 shadow_compare(uint compare_func
,
623 float rgba
[NUM_CHANNELS
][QUAD_SIZE
],
624 const float p
[QUAD_SIZE
],
628 switch (compare_func
) {
630 k
= p
[j
] < rgba
[0][j
];
632 case PIPE_FUNC_LEQUAL
:
633 k
= p
[j
] <= rgba
[0][j
];
635 case PIPE_FUNC_GREATER
:
636 k
= p
[j
] > rgba
[0][j
];
638 case PIPE_FUNC_GEQUAL
:
639 k
= p
[j
] >= rgba
[0][j
];
641 case PIPE_FUNC_EQUAL
:
642 k
= p
[j
] == rgba
[0][j
];
644 case PIPE_FUNC_NOTEQUAL
:
645 k
= p
[j
] != rgba
[0][j
];
647 case PIPE_FUNC_ALWAYS
:
650 case PIPE_FUNC_NEVER
:
659 rgba
[0][j
] = rgba
[1][j
] = rgba
[2][j
] = (float) k
;
664 * Common code for sampling 1D/2D/cube textures.
665 * Could probably extend for 3D...
668 sp_get_samples_2d_common(struct tgsi_sampler
*sampler
,
669 const float s
[QUAD_SIZE
],
670 const float t
[QUAD_SIZE
],
671 const float p
[QUAD_SIZE
],
673 float rgba
[NUM_CHANNELS
][QUAD_SIZE
],
674 const unsigned faces
[4])
676 const uint compare_func
= sampler
->state
->compare_func
;
677 unsigned level0
, level1
, j
, imgFilter
;
681 choose_mipmap_levels(sampler
, s
, t
, p
, lodbias
,
682 &level0
, &level1
, &levelBlend
, &imgFilter
);
684 assert(sampler
->state
->normalized_coords
);
686 width
= sampler
->texture
->width
[level0
];
687 height
= sampler
->texture
->height
[level0
];
692 case PIPE_TEX_FILTER_NEAREST
:
693 for (j
= 0; j
< QUAD_SIZE
; j
++) {
694 int x
= nearest_texcoord(sampler
->state
->wrap_s
, s
[j
], width
);
695 int y
= nearest_texcoord(sampler
->state
->wrap_t
, t
[j
], height
);
696 get_texel(sampler
, faces
[j
], level0
, x
, y
, 0, rgba
, j
);
697 if (sampler
->state
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
) {
698 shadow_compare(compare_func
, rgba
, p
, j
);
701 if (level0
!= level1
) {
702 /* get texels from second mipmap level and blend */
707 get_texel(sampler
, faces
[j
], level1
, x
, y
, 0, rgba2
, j
);
708 if (sampler
->state
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
){
709 shadow_compare(compare_func
, rgba2
, p
, j
);
712 for (c
= 0; c
< NUM_CHANNELS
; c
++) {
713 rgba
[c
][j
] = LERP(levelBlend
, rgba
[c
][j
], rgba2
[c
][j
]);
718 case PIPE_TEX_FILTER_LINEAR
:
719 case PIPE_TEX_FILTER_ANISO
:
720 for (j
= 0; j
< QUAD_SIZE
; j
++) {
721 float tx
[4][4], a
, b
;
722 int x0
, y0
, x1
, y1
, c
;
723 linear_texcoord(sampler
->state
->wrap_s
, s
[j
], width
, &x0
, &x1
, &a
);
724 linear_texcoord(sampler
->state
->wrap_t
, t
[j
], height
, &y0
, &y1
, &b
);
725 get_texel(sampler
, faces
[j
], level0
, x0
, y0
, 0, tx
, 0);
726 get_texel(sampler
, faces
[j
], level0
, x1
, y0
, 0, tx
, 1);
727 get_texel(sampler
, faces
[j
], level0
, x0
, y1
, 0, tx
, 2);
728 get_texel(sampler
, faces
[j
], level0
, x1
, y1
, 0, tx
, 3);
729 if (sampler
->state
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
) {
730 shadow_compare(compare_func
, tx
, p
, 0);
731 shadow_compare(compare_func
, tx
, p
, 1);
732 shadow_compare(compare_func
, tx
, p
, 2);
733 shadow_compare(compare_func
, tx
, p
, 3);
736 for (c
= 0; c
< 4; c
++) {
737 rgba
[c
][j
] = lerp_2d(a
, b
, tx
[c
][0], tx
[c
][1], tx
[c
][2], tx
[c
][3]);
740 if (level0
!= level1
) {
741 /* get texels from second mipmap level and blend */
747 get_texel(sampler
, faces
[j
], level1
, x0
, y0
, 0, tx
, 0);
748 get_texel(sampler
, faces
[j
], level1
, x1
, y0
, 0, tx
, 1);
749 get_texel(sampler
, faces
[j
], level1
, x0
, y1
, 0, tx
, 2);
750 get_texel(sampler
, faces
[j
], level1
, x1
, y1
, 0, tx
, 3);
751 if (sampler
->state
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
){
752 shadow_compare(compare_func
, tx
, p
, 0);
753 shadow_compare(compare_func
, tx
, p
, 1);
754 shadow_compare(compare_func
, tx
, p
, 2);
755 shadow_compare(compare_func
, tx
, p
, 3);
758 for (c
= 0; c
< 4; c
++) {
759 rgba2
[c
][j
] = lerp_2d(a
, b
,
760 tx
[c
][0], tx
[c
][1], tx
[c
][2], tx
[c
][3]);
763 for (c
= 0; c
< NUM_CHANNELS
; c
++) {
764 rgba
[c
][j
] = LERP(levelBlend
, rgba
[c
][j
], rgba2
[c
][j
]);
776 sp_get_samples_1d(struct tgsi_sampler
*sampler
,
777 const float s
[QUAD_SIZE
],
778 const float t
[QUAD_SIZE
],
779 const float p
[QUAD_SIZE
],
781 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
783 static const unsigned faces
[4] = {0, 0, 0, 0};
784 static const float tzero
[4] = {0, 0, 0, 0};
785 sp_get_samples_2d_common(sampler
, s
, tzero
, NULL
, lodbias
, rgba
, faces
);
790 sp_get_samples_2d(struct tgsi_sampler
*sampler
,
791 const float s
[QUAD_SIZE
],
792 const float t
[QUAD_SIZE
],
793 const float p
[QUAD_SIZE
],
795 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
797 static const unsigned faces
[4] = {0, 0, 0, 0};
798 sp_get_samples_2d_common(sampler
, s
, t
, p
, lodbias
, rgba
, faces
);
803 sp_get_samples_3d(struct tgsi_sampler
*sampler
,
804 const float s
[QUAD_SIZE
],
805 const float t
[QUAD_SIZE
],
806 const float p
[QUAD_SIZE
],
808 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
810 /* get/map pipe_surfaces corresponding to 3D tex slices */
811 unsigned level0
, level1
, j
, imgFilter
;
812 int width
, height
, depth
;
816 choose_mipmap_levels(sampler
, s
, t
, p
, lodbias
,
817 &level0
, &level1
, &levelBlend
, &imgFilter
);
819 assert(sampler
->state
->normalized_coords
);
821 width
= sampler
->texture
->width
[level0
];
822 height
= sampler
->texture
->height
[level0
];
823 depth
= sampler
->texture
->depth
[level0
];
830 case PIPE_TEX_FILTER_NEAREST
:
831 for (j
= 0; j
< QUAD_SIZE
; j
++) {
832 int x
= nearest_texcoord(sampler
->state
->wrap_s
, s
[j
], width
);
833 int y
= nearest_texcoord(sampler
->state
->wrap_t
, t
[j
], height
);
834 int z
= nearest_texcoord(sampler
->state
->wrap_r
, p
[j
], depth
);
835 get_texel(sampler
, face
, level0
, x
, y
, z
, rgba
, j
);
837 if (level0
!= level1
) {
838 /* get texels from second mipmap level and blend */
844 get_texel(sampler
, face
, level1
, x
, y
, z
, rgba2
, j
);
845 for (c
= 0; c
< NUM_CHANNELS
; c
++) {
846 rgba
[c
][j
] = LERP(levelBlend
, rgba2
[c
][j
], rgba
[c
][j
]);
851 case PIPE_TEX_FILTER_LINEAR
:
852 case PIPE_TEX_FILTER_ANISO
:
853 for (j
= 0; j
< QUAD_SIZE
; j
++) {
854 float texel0
[4][4], texel1
[4][4];
855 float xw
, yw
, zw
; /* interpolation weights */
856 int x0
, x1
, y0
, y1
, z0
, z1
, c
;
857 linear_texcoord(sampler
->state
->wrap_s
, s
[j
], width
, &x0
, &x1
, &xw
);
858 linear_texcoord(sampler
->state
->wrap_t
, t
[j
], height
, &y0
, &y1
, &yw
);
859 linear_texcoord(sampler
->state
->wrap_r
, p
[j
], depth
, &z0
, &z1
, &zw
);
860 get_texel(sampler
, face
, level0
, x0
, y0
, z0
, texel0
, 0);
861 get_texel(sampler
, face
, level0
, x1
, y0
, z0
, texel0
, 1);
862 get_texel(sampler
, face
, level0
, x0
, y1
, z0
, texel0
, 2);
863 get_texel(sampler
, face
, level0
, x1
, y1
, z0
, texel0
, 3);
864 get_texel(sampler
, face
, level0
, x0
, y0
, z1
, texel1
, 0);
865 get_texel(sampler
, face
, level0
, x1
, y0
, z1
, texel1
, 1);
866 get_texel(sampler
, face
, level0
, x0
, y1
, z1
, texel1
, 2);
867 get_texel(sampler
, face
, level0
, x1
, y1
, z1
, texel1
, 3);
870 for (c
= 0; c
< 4; c
++) {
871 float ctemp0
[4][4], ctemp1
[4][4];
872 ctemp0
[c
][j
] = lerp_2d(xw
, yw
,
873 texel0
[c
][0], texel0
[c
][1],
874 texel0
[c
][2], texel0
[c
][3]);
875 ctemp1
[c
][j
] = lerp_2d(xw
, yw
,
876 texel1
[c
][0], texel1
[c
][1],
877 texel1
[c
][2], texel1
[c
][3]);
878 rgba
[c
][j
] = LERP(zw
, ctemp0
[c
][j
], ctemp1
[c
][j
]);
881 if (level0
!= level1
) {
882 /* get texels from second mipmap level and blend */
890 get_texel(sampler
, face
, level1
, x0
, y0
, z0
, texel0
, 0);
891 get_texel(sampler
, face
, level1
, x1
, y0
, z0
, texel0
, 1);
892 get_texel(sampler
, face
, level1
, x0
, y1
, z0
, texel0
, 2);
893 get_texel(sampler
, face
, level1
, x1
, y1
, z0
, texel0
, 3);
894 get_texel(sampler
, face
, level1
, x0
, y0
, z1
, texel1
, 0);
895 get_texel(sampler
, face
, level1
, x1
, y0
, z1
, texel1
, 1);
896 get_texel(sampler
, face
, level1
, x0
, y1
, z1
, texel1
, 2);
897 get_texel(sampler
, face
, level1
, x1
, y1
, z1
, texel1
, 3);
900 for (c
= 0; c
< 4; c
++) {
901 float ctemp0
[4][4], ctemp1
[4][4];
902 ctemp0
[c
][j
] = lerp_2d(xw
, yw
,
903 texel0
[c
][0], texel0
[c
][1],
904 texel0
[c
][2], texel0
[c
][3]);
905 ctemp1
[c
][j
] = lerp_2d(xw
, yw
,
906 texel1
[c
][0], texel1
[c
][1],
907 texel1
[c
][2], texel1
[c
][3]);
908 rgba2
[c
][j
] = LERP(zw
, ctemp0
[c
][j
], ctemp1
[c
][j
]);
911 /* blend mipmap levels */
912 for (c
= 0; c
< NUM_CHANNELS
; c
++) {
913 rgba
[c
][j
] = LERP(levelBlend
, rgba
[c
][j
], rgba2
[c
][j
]);
925 sp_get_samples_cube(struct tgsi_sampler
*sampler
,
926 const float s
[QUAD_SIZE
],
927 const float t
[QUAD_SIZE
],
928 const float p
[QUAD_SIZE
],
930 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
932 unsigned faces
[QUAD_SIZE
], j
;
933 float ssss
[4], tttt
[4];
934 for (j
= 0; j
< QUAD_SIZE
; j
++) {
935 faces
[j
] = choose_cube_face(s
[j
], t
[j
], p
[j
], ssss
+ j
, tttt
+ j
);
937 sp_get_samples_2d_common(sampler
, ssss
, tttt
, NULL
, lodbias
, rgba
, faces
);
942 sp_get_samples_rect(struct tgsi_sampler
*sampler
,
943 const float s
[QUAD_SIZE
],
944 const float t
[QUAD_SIZE
],
945 const float p
[QUAD_SIZE
],
947 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
949 //sp_get_samples_2d_common(sampler, s, t, p, lodbias, rgba, faces);
950 static const uint face
= 0;
951 const uint compare_func
= sampler
->state
->compare_func
;
952 unsigned level0
, level1
, j
, imgFilter
;
956 choose_mipmap_levels(sampler
, s
, t
, p
, lodbias
,
957 &level0
, &level1
, &levelBlend
, &imgFilter
);
959 /* texture RECTS cannot be mipmapped */
960 assert(level0
== level1
);
962 width
= sampler
->texture
->width
[level0
];
963 height
= sampler
->texture
->height
[level0
];
968 case PIPE_TEX_FILTER_NEAREST
:
969 for (j
= 0; j
< QUAD_SIZE
; j
++) {
970 int x
= nearest_texcoord_unnorm(sampler
->state
->wrap_s
, s
[j
], width
);
971 int y
= nearest_texcoord_unnorm(sampler
->state
->wrap_t
, t
[j
], height
);
972 get_texel(sampler
, face
, level0
, x
, y
, 0, rgba
, j
);
973 if (sampler
->state
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
) {
974 shadow_compare(compare_func
, rgba
, p
, j
);
978 case PIPE_TEX_FILTER_LINEAR
:
979 case PIPE_TEX_FILTER_ANISO
:
980 for (j
= 0; j
< QUAD_SIZE
; j
++) {
981 float tx
[4][4], a
, b
;
982 int x0
, y0
, x1
, y1
, c
;
983 linear_texcoord_unnorm(sampler
->state
->wrap_s
, s
[j
], width
, &x0
, &x1
, &a
);
984 linear_texcoord_unnorm(sampler
->state
->wrap_t
, t
[j
], height
, &y0
, &y1
, &b
);
985 get_texel(sampler
, face
, level0
, x0
, y0
, 0, tx
, 0);
986 get_texel(sampler
, face
, level0
, x1
, y0
, 0, tx
, 1);
987 get_texel(sampler
, face
, level0
, x0
, y1
, 0, tx
, 2);
988 get_texel(sampler
, face
, level0
, x1
, y1
, 0, tx
, 3);
989 if (sampler
->state
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
) {
990 shadow_compare(compare_func
, tx
, p
, 0);
991 shadow_compare(compare_func
, tx
, p
, 1);
992 shadow_compare(compare_func
, tx
, p
, 2);
993 shadow_compare(compare_func
, tx
, p
, 3);
996 for (c
= 0; c
< 4; c
++) {
997 rgba
[c
][j
] = lerp_2d(a
, b
, tx
[c
][0], tx
[c
][1], tx
[c
][2], tx
[c
][3]);
1010 * Called via tgsi_sampler::get_samples()
1011 * Use the sampler's state setting to get a filtered RGBA value
1012 * from the sampler's texture.
1014 * XXX we can implement many versions of this function, each
1015 * tightly coded for a specific combination of sampler state
1016 * (nearest + repeat), (bilinear mipmap + clamp), etc.
1018 * The update_samplers() function in st_atom_sampler.c could create
1019 * a new tgsi_sampler object for each state combo it finds....
1022 sp_get_samples(struct tgsi_sampler
*sampler
,
1023 const float s
[QUAD_SIZE
],
1024 const float t
[QUAD_SIZE
],
1025 const float p
[QUAD_SIZE
],
1027 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
1029 if (!sampler
->texture
)
1032 switch (sampler
->texture
->target
) {
1033 case PIPE_TEXTURE_1D
:
1034 assert(sampler
->state
->normalized_coords
);
1035 sp_get_samples_1d(sampler
, s
, t
, p
, lodbias
, rgba
);
1037 case PIPE_TEXTURE_2D
:
1038 if (sampler
->state
->normalized_coords
)
1039 sp_get_samples_2d(sampler
, s
, t
, p
, lodbias
, rgba
);
1041 sp_get_samples_rect(sampler
, s
, t
, p
, lodbias
, rgba
);
1043 case PIPE_TEXTURE_3D
:
1044 assert(sampler
->state
->normalized_coords
);
1045 sp_get_samples_3d(sampler
, s
, t
, p
, lodbias
, rgba
);
1047 case PIPE_TEXTURE_CUBE
:
1048 assert(sampler
->state
->normalized_coords
);
1049 sp_get_samples_cube(sampler
, s
, t
, p
, lodbias
, rgba
);
1058 printf("Sampled at %f, %f, %f:\n", s
[0], t
[0], p
[0]);
1059 for (i
= 0; i
< 4; i
++) {
1060 printf("Frag %d: %f %f %f %f\n", i
,