1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
5 * Copyright 2008 VMware, Inc. All rights reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 **************************************************************************/
36 #include "sp_context.h"
38 #include "sp_surface.h"
39 #include "sp_texture.h"
40 #include "sp_tex_sample.h"
41 #include "sp_tile_cache.h"
42 #include "pipe/p_context.h"
43 #include "pipe/p_defines.h"
44 #include "util/u_math.h"
45 #include "util/u_memory.h"
50 * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
51 * see 1-pixel bands of improperly weighted linear-filtered textures.
52 * The tests/texwrap.c demo is a good test.
53 * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
54 * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
56 #define FRAC(f) ((f) - util_ifloor(f))
60 * Linear interpolation macro
63 lerp(float a
, float v0
, float v1
)
65 return v0
+ a
* (v1
- v0
);
70 * Do 2D/biliner interpolation of float values.
71 * v00, v10, v01 and v11 are typically four texture samples in a square/box.
72 * a and b are the horizontal and vertical interpolants.
73 * It's important that this function is inlined when compiled with
74 * optimization! If we find that's not true on some systems, convert
78 lerp_2d(float a
, float b
,
79 float v00
, float v10
, float v01
, float v11
)
81 const float temp0
= lerp(a
, v00
, v10
);
82 const float temp1
= lerp(a
, v01
, v11
);
83 return lerp(b
, temp0
, temp1
);
88 * As above, but 3D interpolation of 8 values.
91 lerp_3d(float a
, float b
, float c
,
92 float v000
, float v100
, float v010
, float v110
,
93 float v001
, float v101
, float v011
, float v111
)
95 const float temp0
= lerp_2d(a
, b
, v000
, v100
, v010
, v110
);
96 const float temp1
= lerp_2d(a
, b
, v001
, v101
, v011
, v111
);
97 return lerp(c
, temp0
, temp1
);
103 * If A is a signed integer, A % B doesn't give the right value for A < 0
104 * (in terms of texture repeat). Just casting to unsigned fixes that.
106 #define REMAINDER(A, B) ((unsigned) (A) % (unsigned) (B))
110 * Apply texture coord wrapping mode and return integer texture indexes
111 * for a vector of four texcoords (S or T or P).
112 * \param wrapMode PIPE_TEX_WRAP_x
113 * \param s the incoming texcoords
114 * \param size the texture image size
115 * \param icoord returns the integer texcoords
116 * \return integer texture index
119 nearest_texcoord_4(unsigned wrapMode
, const float s
[4], unsigned size
,
124 case PIPE_TEX_WRAP_REPEAT
:
125 /* s limited to [0,1) */
126 /* i limited to [0,size-1] */
127 for (ch
= 0; ch
< 4; ch
++) {
128 int i
= util_ifloor(s
[ch
] * size
);
129 icoord
[ch
] = REMAINDER(i
, size
);
132 case PIPE_TEX_WRAP_CLAMP
:
133 /* s limited to [0,1] */
134 /* i limited to [0,size-1] */
135 for (ch
= 0; ch
< 4; ch
++) {
138 else if (s
[ch
] >= 1.0F
)
139 icoord
[ch
] = size
- 1;
141 icoord
[ch
] = util_ifloor(s
[ch
] * size
);
144 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
146 /* s limited to [min,max] */
147 /* i limited to [0, size-1] */
148 const float min
= 1.0F
/ (2.0F
* size
);
149 const float max
= 1.0F
- min
;
150 for (ch
= 0; ch
< 4; ch
++) {
153 else if (s
[ch
] > max
)
154 icoord
[ch
] = size
- 1;
156 icoord
[ch
] = util_ifloor(s
[ch
] * size
);
160 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
162 /* s limited to [min,max] */
163 /* i limited to [-1, size] */
164 const float min
= -1.0F
/ (2.0F
* size
);
165 const float max
= 1.0F
- min
;
166 for (ch
= 0; ch
< 4; ch
++) {
169 else if (s
[ch
] >= max
)
172 icoord
[ch
] = util_ifloor(s
[ch
] * size
);
176 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
178 const float min
= 1.0F
/ (2.0F
* size
);
179 const float max
= 1.0F
- min
;
180 for (ch
= 0; ch
< 4; ch
++) {
181 const int flr
= util_ifloor(s
[ch
]);
184 u
= 1.0F
- (s
[ch
] - (float) flr
);
186 u
= s
[ch
] - (float) flr
;
190 icoord
[ch
] = size
- 1;
192 icoord
[ch
] = util_ifloor(u
* size
);
196 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
197 for (ch
= 0; ch
< 4; ch
++) {
198 /* s limited to [0,1] */
199 /* i limited to [0,size-1] */
200 const float u
= fabsf(s
[ch
]);
204 icoord
[ch
] = size
- 1;
206 icoord
[ch
] = util_ifloor(u
* size
);
209 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
211 /* s limited to [min,max] */
212 /* i limited to [0, size-1] */
213 const float min
= 1.0F
/ (2.0F
* size
);
214 const float max
= 1.0F
- min
;
215 for (ch
= 0; ch
< 4; ch
++) {
216 const float u
= fabsf(s
[ch
]);
220 icoord
[ch
] = size
- 1;
222 icoord
[ch
] = util_ifloor(u
* size
);
226 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
228 /* s limited to [min,max] */
229 /* i limited to [0, size-1] */
230 const float min
= -1.0F
/ (2.0F
* size
);
231 const float max
= 1.0F
- min
;
232 for (ch
= 0; ch
< 4; ch
++) {
233 const float u
= fabsf(s
[ch
]);
239 icoord
[ch
] = util_ifloor(u
* size
);
250 * Used to compute texel locations for linear sampling for four texcoords.
251 * \param wrapMode PIPE_TEX_WRAP_x
252 * \param s the texcoords
253 * \param size the texture image size
254 * \param icoord0 returns first texture indexes
255 * \param icoord1 returns second texture indexes (usually icoord0 + 1)
256 * \param w returns blend factor/weight between texture indexes
257 * \param icoord returns the computed integer texture coords
260 linear_texcoord_4(unsigned wrapMode
, const float s
[4], unsigned size
,
261 int icoord0
[4], int icoord1
[4], float w
[4])
266 case PIPE_TEX_WRAP_REPEAT
:
267 for (ch
= 0; ch
< 4; ch
++) {
268 float u
= s
[ch
] * size
- 0.5F
;
269 icoord0
[ch
] = REMAINDER(util_ifloor(u
), size
);
270 icoord1
[ch
] = REMAINDER(icoord0
[ch
] + 1, size
);
274 case PIPE_TEX_WRAP_CLAMP
:
275 for (ch
= 0; ch
< 4; ch
++) {
276 float u
= CLAMP(s
[ch
], 0.0F
, 1.0F
);
278 icoord0
[ch
] = util_ifloor(u
);
279 icoord1
[ch
] = icoord0
[ch
] + 1;
283 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
284 for (ch
= 0; ch
< 4; ch
++) {
285 float u
= CLAMP(s
[ch
], 0.0F
, 1.0F
);
287 icoord0
[ch
] = util_ifloor(u
);
288 icoord1
[ch
] = icoord0
[ch
] + 1;
291 if (icoord1
[ch
] >= (int) size
)
292 icoord1
[ch
] = size
- 1;
296 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
298 const float min
= -1.0F
/ (2.0F
* size
);
299 const float max
= 1.0F
- min
;
300 for (ch
= 0; ch
< 4; ch
++) {
301 float u
= CLAMP(s
[ch
], min
, max
);
303 icoord0
[ch
] = util_ifloor(u
);
304 icoord1
[ch
] = icoord0
[ch
] + 1;
309 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
310 for (ch
= 0; ch
< 4; ch
++) {
311 const int flr
= util_ifloor(s
[ch
]);
314 u
= 1.0F
- (s
[ch
] - (float) flr
);
316 u
= s
[ch
] - (float) flr
;
318 icoord0
[ch
] = util_ifloor(u
);
319 icoord1
[ch
] = icoord0
[ch
] + 1;
322 if (icoord1
[ch
] >= (int) size
)
323 icoord1
[ch
] = size
- 1;
327 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
328 for (ch
= 0; ch
< 4; ch
++) {
329 float u
= fabsf(s
[ch
]);
335 icoord0
[ch
] = util_ifloor(u
);
336 icoord1
[ch
] = icoord0
[ch
] + 1;
340 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
341 for (ch
= 0; ch
< 4; ch
++) {
342 float u
= fabsf(s
[ch
]);
348 icoord0
[ch
] = util_ifloor(u
);
349 icoord1
[ch
] = icoord0
[ch
] + 1;
352 if (icoord1
[ch
] >= (int) size
)
353 icoord1
[ch
] = size
- 1;
357 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
359 const float min
= -1.0F
/ (2.0F
* size
);
360 const float max
= 1.0F
- min
;
361 for (ch
= 0; ch
< 4; ch
++) {
362 float u
= fabsf(s
[ch
]);
370 icoord0
[ch
] = util_ifloor(u
);
371 icoord1
[ch
] = icoord0
[ch
] + 1;
383 * For RECT textures / unnormalized texcoords
384 * Only a subset of wrap modes supported.
387 nearest_texcoord_unnorm_4(unsigned wrapMode
, const float s
[4], unsigned size
,
392 case PIPE_TEX_WRAP_CLAMP
:
393 for (ch
= 0; ch
< 4; ch
++) {
394 int i
= util_ifloor(s
[ch
]);
395 icoord
[ch
]= CLAMP(i
, 0, (int) size
-1);
398 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
400 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
401 for (ch
= 0; ch
< 4; ch
++) {
402 icoord
[ch
]= util_ifloor( CLAMP(s
[ch
], 0.5F
, (float) size
- 0.5F
) );
412 * For RECT textures / unnormalized texcoords.
413 * Only a subset of wrap modes supported.
416 linear_texcoord_unnorm_4(unsigned wrapMode
, const float s
[4], unsigned size
,
417 int icoord0
[4], int icoord1
[4], float w
[4])
421 case PIPE_TEX_WRAP_CLAMP
:
422 for (ch
= 0; ch
< 4; ch
++) {
423 /* Not exactly what the spec says, but it matches NVIDIA output */
424 float u
= CLAMP(s
[ch
] - 0.5F
, 0.0f
, (float) size
- 1.0f
);
425 icoord0
[ch
] = util_ifloor(u
);
426 icoord1
[ch
] = icoord0
[ch
] + 1;
430 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
432 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
433 for (ch
= 0; ch
< 4; ch
++) {
434 float u
= CLAMP(s
[ch
], 0.5F
, (float) size
- 0.5F
);
436 icoord0
[ch
] = util_ifloor(u
);
437 icoord1
[ch
] = icoord0
[ch
] + 1;
438 if (icoord1
[ch
] > (int) size
- 1)
439 icoord1
[ch
] = size
- 1;
450 choose_cube_face(float rx
, float ry
, float rz
, float *newS
, float *newT
)
454 direction target sc tc ma
455 ---------- ------------------------------- --- --- ---
456 +rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
457 -rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
458 +ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
459 -ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
460 +rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
461 -rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
463 const float arx
= fabsf(rx
), ary
= fabsf(ry
), arz
= fabsf(rz
);
467 if (arx
> ary
&& arx
> arz
) {
469 face
= PIPE_TEX_FACE_POS_X
;
475 face
= PIPE_TEX_FACE_NEG_X
;
481 else if (ary
> arx
&& ary
> arz
) {
483 face
= PIPE_TEX_FACE_POS_Y
;
489 face
= PIPE_TEX_FACE_NEG_Y
;
497 face
= PIPE_TEX_FACE_POS_Z
;
503 face
= PIPE_TEX_FACE_NEG_Z
;
510 *newS
= ( sc
/ ma
+ 1.0F
) * 0.5F
;
511 *newT
= ( tc
/ ma
+ 1.0F
) * 0.5F
;
518 * Examine the quad's texture coordinates to compute the partial
519 * derivatives w.r.t X and Y, then compute lambda (level of detail).
521 * This is only done for fragment shaders, not vertex shaders.
524 compute_lambda(const struct pipe_texture
*tex
,
525 const struct pipe_sampler_state
*sampler
,
526 const float s
[QUAD_SIZE
],
527 const float t
[QUAD_SIZE
],
528 const float p
[QUAD_SIZE
],
533 assert(sampler
->normalized_coords
);
537 float dsdx
= s
[QUAD_BOTTOM_RIGHT
] - s
[QUAD_BOTTOM_LEFT
];
538 float dsdy
= s
[QUAD_TOP_LEFT
] - s
[QUAD_BOTTOM_LEFT
];
541 rho
= MAX2(dsdx
, dsdy
) * tex
->width
[0];
544 float dtdx
= t
[QUAD_BOTTOM_RIGHT
] - t
[QUAD_BOTTOM_LEFT
];
545 float dtdy
= t
[QUAD_TOP_LEFT
] - t
[QUAD_BOTTOM_LEFT
];
549 max
= MAX2(dtdx
, dtdy
) * tex
->height
[0];
550 rho
= MAX2(rho
, max
);
553 float dpdx
= p
[QUAD_BOTTOM_RIGHT
] - p
[QUAD_BOTTOM_LEFT
];
554 float dpdy
= p
[QUAD_TOP_LEFT
] - p
[QUAD_BOTTOM_LEFT
];
558 max
= MAX2(dpdx
, dpdy
) * tex
->depth
[0];
559 rho
= MAX2(rho
, max
);
562 lambda
= util_fast_log2(rho
);
563 lambda
+= lodbias
+ sampler
->lod_bias
;
564 lambda
= CLAMP(lambda
, sampler
->min_lod
, sampler
->max_lod
);
571 * Do several things here:
572 * 1. Compute lambda from the texcoords, if needed
573 * 2. Determine if we're minifying or magnifying
574 * 3. If minifying, choose mipmap levels
575 * 4. Return image filter to use within mipmap images
576 * \param level0 Returns first mipmap level to sample from
577 * \param level1 Returns second mipmap level to sample from
578 * \param levelBlend Returns blend factor between levels, in [0,1]
579 * \param imgFilter Returns either the min or mag filter, depending on lambda
582 choose_mipmap_levels(const struct pipe_texture
*texture
,
583 const struct pipe_sampler_state
*sampler
,
584 const float s
[QUAD_SIZE
],
585 const float t
[QUAD_SIZE
],
586 const float p
[QUAD_SIZE
],
587 boolean computeLambda
,
589 unsigned *level0
, unsigned *level1
, float *levelBlend
,
592 if (sampler
->min_mip_filter
== PIPE_TEX_MIPFILTER_NONE
) {
593 /* no mipmap selection needed */
594 *level0
= *level1
= CLAMP((int) sampler
->min_lod
,
595 0, (int) texture
->last_level
);
597 if (sampler
->min_img_filter
!= sampler
->mag_img_filter
) {
598 /* non-mipmapped texture, but still need to determine if doing
599 * minification or magnification.
601 float lambda
= compute_lambda(texture
, sampler
, s
, t
, p
, lodbias
);
603 *imgFilter
= sampler
->mag_img_filter
;
606 *imgFilter
= sampler
->min_img_filter
;
610 *imgFilter
= sampler
->mag_img_filter
;
617 /* fragment shader */
618 lambda
= compute_lambda(texture
, sampler
, s
, t
, p
, lodbias
);
621 lambda
= lodbias
; /* not really a bias, but absolute LOD */
623 if (lambda
<= 0.0) { /* XXX threshold depends on the filter */
625 *imgFilter
= sampler
->mag_img_filter
;
626 *level0
= *level1
= 0;
630 *imgFilter
= sampler
->min_img_filter
;
632 /* choose mipmap level(s) and compute the blend factor between them */
633 if (sampler
->min_mip_filter
== PIPE_TEX_MIPFILTER_NEAREST
) {
634 /* Nearest mipmap level */
635 const int lvl
= (int) (lambda
+ 0.5);
637 *level1
= CLAMP(lvl
, 0, (int) texture
->last_level
);
640 /* Linear interpolation between mipmap levels */
641 const int lvl
= (int) lambda
;
642 *level0
= CLAMP(lvl
, 0, (int) texture
->last_level
);
643 *level1
= CLAMP(lvl
+ 1, 0, (int) texture
->last_level
);
644 *levelBlend
= FRAC(lambda
); /* blending weight between levels */
652 * Get a texel from a texture, using the texture tile cache.
654 * \param face the cube face in 0..5
655 * \param level the mipmap level
656 * \param x the x coord of texel within 2D image
657 * \param y the y coord of texel within 2D image
658 * \param z which slice of a 3D texture
659 * \param rgba the quad to put the texel/color into
660 * \param j which element of the rgba quad to write to
662 * XXX maybe move this into sp_tile_cache.c and merge with the
663 * sp_get_cached_tile_tex() function. Also, get 4 texels instead of 1...
666 get_texel(const struct tgsi_sampler
*tgsi_sampler
,
667 unsigned face
, unsigned level
, int x
, int y
, int z
,
668 float rgba
[NUM_CHANNELS
][QUAD_SIZE
], unsigned j
)
670 const struct sp_shader_sampler
*samp
= sp_shader_sampler(tgsi_sampler
);
671 struct softpipe_context
*sp
= samp
->sp
;
672 const uint unit
= samp
->unit
;
673 const struct pipe_texture
*texture
= sp
->texture
[unit
];
674 const struct pipe_sampler_state
*sampler
= sp
->sampler
[unit
];
676 if (x
< 0 || x
>= (int) texture
->width
[level
] ||
677 y
< 0 || y
>= (int) texture
->height
[level
] ||
678 z
< 0 || z
>= (int) texture
->depth
[level
]) {
679 rgba
[0][j
] = sampler
->border_color
[0];
680 rgba
[1][j
] = sampler
->border_color
[1];
681 rgba
[2][j
] = sampler
->border_color
[2];
682 rgba
[3][j
] = sampler
->border_color
[3];
685 const int tx
= x
% TILE_SIZE
;
686 const int ty
= y
% TILE_SIZE
;
687 const struct softpipe_cached_tile
*tile
688 = sp_get_cached_tile_tex(sp
, samp
->cache
,
689 x
, y
, z
, face
, level
);
690 rgba
[0][j
] = tile
->data
.color
[ty
][tx
][0];
691 rgba
[1][j
] = tile
->data
.color
[ty
][tx
][1];
692 rgba
[2][j
] = tile
->data
.color
[ty
][tx
][2];
693 rgba
[3][j
] = tile
->data
.color
[ty
][tx
][3];
696 debug_printf("Get texel %f %f %f %f from %s\n",
697 rgba
[0][j
], rgba
[1][j
], rgba
[2][j
], rgba
[3][j
],
698 pf_name(texture
->format
));
705 * Compare texcoord 'p' (aka R) against texture value 'rgba[0]'
706 * When we sampled the depth texture, the depth value was put into all
707 * RGBA channels. We look at the red channel here.
710 shadow_compare(uint compare_func
,
711 float rgba
[NUM_CHANNELS
][QUAD_SIZE
],
712 const float p
[QUAD_SIZE
],
716 switch (compare_func
) {
718 k
= p
[j
] < rgba
[0][j
];
720 case PIPE_FUNC_LEQUAL
:
721 k
= p
[j
] <= rgba
[0][j
];
723 case PIPE_FUNC_GREATER
:
724 k
= p
[j
] > rgba
[0][j
];
726 case PIPE_FUNC_GEQUAL
:
727 k
= p
[j
] >= rgba
[0][j
];
729 case PIPE_FUNC_EQUAL
:
730 k
= p
[j
] == rgba
[0][j
];
732 case PIPE_FUNC_NOTEQUAL
:
733 k
= p
[j
] != rgba
[0][j
];
735 case PIPE_FUNC_ALWAYS
:
738 case PIPE_FUNC_NEVER
:
747 rgba
[0][j
] = rgba
[1][j
] = rgba
[2][j
] = (float) k
;
752 * Common code for sampling 1D/2D/cube textures.
753 * Could probably extend for 3D...
756 sp_get_samples_2d_common(const struct tgsi_sampler
*tgsi_sampler
,
757 const float s
[QUAD_SIZE
],
758 const float t
[QUAD_SIZE
],
759 const float p
[QUAD_SIZE
],
760 boolean computeLambda
,
762 float rgba
[NUM_CHANNELS
][QUAD_SIZE
],
763 const unsigned faces
[4])
765 const struct sp_shader_sampler
*samp
= sp_shader_sampler(tgsi_sampler
);
766 const struct softpipe_context
*sp
= samp
->sp
;
767 const uint unit
= samp
->unit
;
768 const struct pipe_texture
*texture
= sp
->texture
[unit
];
769 const struct pipe_sampler_state
*sampler
= sp
->sampler
[unit
];
770 const uint compare_func
= sampler
->compare_func
;
771 unsigned level0
, level1
, j
, imgFilter
;
775 choose_mipmap_levels(texture
, sampler
, s
, t
, p
, computeLambda
, lodbias
,
776 &level0
, &level1
, &levelBlend
, &imgFilter
);
778 assert(sampler
->normalized_coords
);
780 width
= texture
->width
[level0
];
781 height
= texture
->height
[level0
];
786 case PIPE_TEX_FILTER_NEAREST
:
789 nearest_texcoord_4(sampler
->wrap_s
, s
, width
, x
);
790 nearest_texcoord_4(sampler
->wrap_t
, t
, height
, y
);
792 for (j
= 0; j
< QUAD_SIZE
; j
++) {
793 get_texel(tgsi_sampler
, faces
[j
], level0
, x
[j
], y
[j
], 0, rgba
, j
);
794 if (sampler
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
) {
795 shadow_compare(compare_func
, rgba
, p
, j
);
798 if (level0
!= level1
) {
799 /* get texels from second mipmap level and blend */
804 get_texel(tgsi_sampler
, faces
[j
], level1
, x
[j
], y
[j
], 0,
806 if (sampler
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
){
807 shadow_compare(compare_func
, rgba2
, p
, j
);
810 for (c
= 0; c
< NUM_CHANNELS
; c
++) {
811 rgba
[c
][j
] = lerp(levelBlend
, rgba
[c
][j
], rgba2
[c
][j
]);
817 case PIPE_TEX_FILTER_LINEAR
:
818 case PIPE_TEX_FILTER_ANISO
:
820 int x0
[4], y0
[4], x1
[4], y1
[4];
821 float xw
[4], yw
[4]; /* weights */
823 linear_texcoord_4(sampler
->wrap_s
, s
, width
, x0
, x1
, xw
);
824 linear_texcoord_4(sampler
->wrap_t
, t
, height
, y0
, y1
, yw
);
826 for (j
= 0; j
< QUAD_SIZE
; j
++) {
827 float tx
[4][4]; /* texels */
829 get_texel(tgsi_sampler
, faces
[j
], level0
, x0
[j
], y0
[j
], 0, tx
, 0);
830 get_texel(tgsi_sampler
, faces
[j
], level0
, x1
[j
], y0
[j
], 0, tx
, 1);
831 get_texel(tgsi_sampler
, faces
[j
], level0
, x0
[j
], y1
[j
], 0, tx
, 2);
832 get_texel(tgsi_sampler
, faces
[j
], level0
, x1
[j
], y1
[j
], 0, tx
, 3);
833 if (sampler
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
) {
834 shadow_compare(compare_func
, tx
, p
, 0);
835 shadow_compare(compare_func
, tx
, p
, 1);
836 shadow_compare(compare_func
, tx
, p
, 2);
837 shadow_compare(compare_func
, tx
, p
, 3);
840 /* interpolate R, G, B, A */
841 for (c
= 0; c
< 4; c
++) {
842 rgba
[c
][j
] = lerp_2d(xw
[j
], yw
[j
],
847 if (level0
!= level1
) {
848 /* get texels from second mipmap level and blend */
854 get_texel(tgsi_sampler
, faces
[j
], level1
, x0
[j
], y0
[j
], 0, tx
, 0);
855 get_texel(tgsi_sampler
, faces
[j
], level1
, x1
[j
], y0
[j
], 0, tx
, 1);
856 get_texel(tgsi_sampler
, faces
[j
], level1
, x0
[j
], y1
[j
], 0, tx
, 2);
857 get_texel(tgsi_sampler
, faces
[j
], level1
, x1
[j
], y1
[j
], 0, tx
, 3);
858 if (sampler
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
){
859 shadow_compare(compare_func
, tx
, p
, 0);
860 shadow_compare(compare_func
, tx
, p
, 1);
861 shadow_compare(compare_func
, tx
, p
, 2);
862 shadow_compare(compare_func
, tx
, p
, 3);
865 /* interpolate R, G, B, A */
866 for (c
= 0; c
< 4; c
++) {
867 rgba2
[c
][j
] = lerp_2d(xw
[j
], yw
[j
],
868 tx
[c
][0], tx
[c
][1], tx
[c
][2], tx
[c
][3]);
871 for (c
= 0; c
< NUM_CHANNELS
; c
++) {
872 rgba
[c
][j
] = lerp(levelBlend
, rgba
[c
][j
], rgba2
[c
][j
]);
885 sp_get_samples_1d(const struct tgsi_sampler
*sampler
,
886 const float s
[QUAD_SIZE
],
887 const float t
[QUAD_SIZE
],
888 const float p
[QUAD_SIZE
],
889 boolean computeLambda
,
891 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
893 static const unsigned faces
[4] = {0, 0, 0, 0};
894 static const float tzero
[4] = {0, 0, 0, 0};
895 sp_get_samples_2d_common(sampler
, s
, tzero
, NULL
,
896 computeLambda
, lodbias
, rgba
, faces
);
901 sp_get_samples_2d(const struct tgsi_sampler
*sampler
,
902 const float s
[QUAD_SIZE
],
903 const float t
[QUAD_SIZE
],
904 const float p
[QUAD_SIZE
],
905 boolean computeLambda
,
907 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
909 static const unsigned faces
[4] = {0, 0, 0, 0};
910 sp_get_samples_2d_common(sampler
, s
, t
, p
,
911 computeLambda
, lodbias
, rgba
, faces
);
916 sp_get_samples_3d(const struct tgsi_sampler
*tgsi_sampler
,
917 const float s
[QUAD_SIZE
],
918 const float t
[QUAD_SIZE
],
919 const float p
[QUAD_SIZE
],
920 boolean computeLambda
,
922 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
924 const struct sp_shader_sampler
*samp
= sp_shader_sampler(tgsi_sampler
);
925 const struct softpipe_context
*sp
= samp
->sp
;
926 const uint unit
= samp
->unit
;
927 const struct pipe_texture
*texture
= sp
->texture
[unit
];
928 const struct pipe_sampler_state
*sampler
= sp
->sampler
[unit
];
929 /* get/map pipe_surfaces corresponding to 3D tex slices */
930 unsigned level0
, level1
, j
, imgFilter
;
931 int width
, height
, depth
;
935 choose_mipmap_levels(texture
, sampler
, s
, t
, p
, computeLambda
, lodbias
,
936 &level0
, &level1
, &levelBlend
, &imgFilter
);
938 assert(sampler
->normalized_coords
);
940 width
= texture
->width
[level0
];
941 height
= texture
->height
[level0
];
942 depth
= texture
->depth
[level0
];
949 case PIPE_TEX_FILTER_NEAREST
:
951 int x
[4], y
[4], z
[4];
952 nearest_texcoord_4(sampler
->wrap_s
, s
, width
, x
);
953 nearest_texcoord_4(sampler
->wrap_t
, t
, height
, y
);
954 nearest_texcoord_4(sampler
->wrap_r
, p
, depth
, z
);
955 for (j
= 0; j
< QUAD_SIZE
; j
++) {
956 get_texel(tgsi_sampler
, face
, level0
, x
[j
], y
[j
], z
[j
], rgba
, j
);
957 if (level0
!= level1
) {
958 /* get texels from second mipmap level and blend */
964 get_texel(tgsi_sampler
, face
, level1
, x
[j
], y
[j
], z
[j
], rgba2
, j
);
965 for (c
= 0; c
< NUM_CHANNELS
; c
++) {
966 rgba
[c
][j
] = lerp(levelBlend
, rgba2
[c
][j
], rgba
[c
][j
]);
972 case PIPE_TEX_FILTER_LINEAR
:
973 case PIPE_TEX_FILTER_ANISO
:
975 int x0
[4], x1
[4], y0
[4], y1
[4], z0
[4], z1
[4];
976 float xw
[4], yw
[4], zw
[4]; /* interpolation weights */
977 linear_texcoord_4(sampler
->wrap_s
, s
, width
, x0
, x1
, xw
);
978 linear_texcoord_4(sampler
->wrap_t
, t
, height
, y0
, y1
, yw
);
979 linear_texcoord_4(sampler
->wrap_r
, p
, depth
, z0
, z1
, zw
);
981 for (j
= 0; j
< QUAD_SIZE
; j
++) {
983 float tx0
[4][4], tx1
[4][4];
984 get_texel(tgsi_sampler
, face
, level0
, x0
[j
], y0
[j
], z0
[j
], tx0
, 0);
985 get_texel(tgsi_sampler
, face
, level0
, x1
[j
], y0
[j
], z0
[j
], tx0
, 1);
986 get_texel(tgsi_sampler
, face
, level0
, x0
[j
], y1
[j
], z0
[j
], tx0
, 2);
987 get_texel(tgsi_sampler
, face
, level0
, x1
[j
], y1
[j
], z0
[j
], tx0
, 3);
988 get_texel(tgsi_sampler
, face
, level0
, x0
[j
], y0
[j
], z1
[j
], tx1
, 0);
989 get_texel(tgsi_sampler
, face
, level0
, x1
[j
], y0
[j
], z1
[j
], tx1
, 1);
990 get_texel(tgsi_sampler
, face
, level0
, x0
[j
], y1
[j
], z1
[j
], tx1
, 2);
991 get_texel(tgsi_sampler
, face
, level0
, x1
[j
], y1
[j
], z1
[j
], tx1
, 3);
993 /* interpolate R, G, B, A */
994 for (c
= 0; c
< 4; c
++) {
995 rgba
[c
][j
] = lerp_3d(xw
[j
], yw
[j
], zw
[j
],
996 tx0
[c
][0], tx0
[c
][1],
997 tx0
[c
][2], tx0
[c
][3],
998 tx1
[c
][0], tx1
[c
][1],
999 tx1
[c
][2], tx1
[c
][3]);
1002 if (level0
!= level1
) {
1003 /* get texels from second mipmap level and blend */
1011 get_texel(tgsi_sampler
, face
, level1
, x0
[j
], y0
[j
], z0
[j
], tx0
, 0);
1012 get_texel(tgsi_sampler
, face
, level1
, x1
[j
], y0
[j
], z0
[j
], tx0
, 1);
1013 get_texel(tgsi_sampler
, face
, level1
, x0
[j
], y1
[j
], z0
[j
], tx0
, 2);
1014 get_texel(tgsi_sampler
, face
, level1
, x1
[j
], y1
[j
], z0
[j
], tx0
, 3);
1015 get_texel(tgsi_sampler
, face
, level1
, x0
[j
], y0
[j
], z1
[j
], tx1
, 0);
1016 get_texel(tgsi_sampler
, face
, level1
, x1
[j
], y0
[j
], z1
[j
], tx1
, 1);
1017 get_texel(tgsi_sampler
, face
, level1
, x0
[j
], y1
[j
], z1
[j
], tx1
, 2);
1018 get_texel(tgsi_sampler
, face
, level1
, x1
[j
], y1
[j
], z1
[j
], tx1
, 3);
1020 /* interpolate R, G, B, A */
1021 for (c
= 0; c
< 4; c
++) {
1022 rgba2
[c
][j
] = lerp_3d(xw
[j
], yw
[j
], zw
[j
],
1023 tx0
[c
][0], tx0
[c
][1],
1024 tx0
[c
][2], tx0
[c
][3],
1025 tx1
[c
][0], tx1
[c
][1],
1026 tx1
[c
][2], tx1
[c
][3]);
1029 /* blend mipmap levels */
1030 for (c
= 0; c
< NUM_CHANNELS
; c
++) {
1031 rgba
[c
][j
] = lerp(levelBlend
, rgba
[c
][j
], rgba2
[c
][j
]);
1044 sp_get_samples_cube(const struct tgsi_sampler
*sampler
,
1045 const float s
[QUAD_SIZE
],
1046 const float t
[QUAD_SIZE
],
1047 const float p
[QUAD_SIZE
],
1048 boolean computeLambda
,
1050 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
1052 unsigned faces
[QUAD_SIZE
], j
;
1053 float ssss
[4], tttt
[4];
1054 for (j
= 0; j
< QUAD_SIZE
; j
++) {
1055 faces
[j
] = choose_cube_face(s
[j
], t
[j
], p
[j
], ssss
+ j
, tttt
+ j
);
1057 sp_get_samples_2d_common(sampler
, ssss
, tttt
, NULL
,
1058 computeLambda
, lodbias
, rgba
, faces
);
1063 sp_get_samples_rect(const struct tgsi_sampler
*tgsi_sampler
,
1064 const float s
[QUAD_SIZE
],
1065 const float t
[QUAD_SIZE
],
1066 const float p
[QUAD_SIZE
],
1067 boolean computeLambda
,
1069 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
1071 const struct sp_shader_sampler
*samp
= sp_shader_sampler(tgsi_sampler
);
1072 const struct softpipe_context
*sp
= samp
->sp
;
1073 const uint unit
= samp
->unit
;
1074 const struct pipe_texture
*texture
= sp
->texture
[unit
];
1075 const struct pipe_sampler_state
*sampler
= sp
->sampler
[unit
];
1076 const uint face
= 0;
1077 const uint compare_func
= sampler
->compare_func
;
1078 unsigned level0
, level1
, j
, imgFilter
;
1082 choose_mipmap_levels(texture
, sampler
, s
, t
, p
, computeLambda
, lodbias
,
1083 &level0
, &level1
, &levelBlend
, &imgFilter
);
1085 /* texture RECTS cannot be mipmapped */
1086 assert(level0
== level1
);
1088 width
= texture
->width
[level0
];
1089 height
= texture
->height
[level0
];
1093 switch (imgFilter
) {
1094 case PIPE_TEX_FILTER_NEAREST
:
1097 nearest_texcoord_unnorm_4(sampler
->wrap_s
, s
, width
, x
);
1098 nearest_texcoord_unnorm_4(sampler
->wrap_t
, t
, height
, y
);
1099 for (j
= 0; j
< QUAD_SIZE
; j
++) {
1100 get_texel(tgsi_sampler
, face
, level0
, x
[j
], y
[j
], 0, rgba
, j
);
1101 if (sampler
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
) {
1102 shadow_compare(compare_func
, rgba
, p
, j
);
1107 case PIPE_TEX_FILTER_LINEAR
:
1108 case PIPE_TEX_FILTER_ANISO
:
1110 int x0
[4], y0
[4], x1
[4], y1
[4];
1111 float xw
[4], yw
[4]; /* weights */
1112 linear_texcoord_unnorm_4(sampler
->wrap_s
, s
, width
, x0
, x1
, xw
);
1113 linear_texcoord_unnorm_4(sampler
->wrap_t
, t
, height
, y0
, y1
, yw
);
1114 for (j
= 0; j
< QUAD_SIZE
; j
++) {
1115 float tx
[4][4]; /* texels */
1117 get_texel(tgsi_sampler
, face
, level0
, x0
[j
], y0
[j
], 0, tx
, 0);
1118 get_texel(tgsi_sampler
, face
, level0
, x1
[j
], y0
[j
], 0, tx
, 1);
1119 get_texel(tgsi_sampler
, face
, level0
, x0
[j
], y1
[j
], 0, tx
, 2);
1120 get_texel(tgsi_sampler
, face
, level0
, x1
[j
], y1
[j
], 0, tx
, 3);
1121 if (sampler
->compare_mode
== PIPE_TEX_COMPARE_R_TO_TEXTURE
) {
1122 shadow_compare(compare_func
, tx
, p
, 0);
1123 shadow_compare(compare_func
, tx
, p
, 1);
1124 shadow_compare(compare_func
, tx
, p
, 2);
1125 shadow_compare(compare_func
, tx
, p
, 3);
1127 for (c
= 0; c
< 4; c
++) {
1128 rgba
[c
][j
] = lerp_2d(xw
[j
], yw
[j
],
1129 tx
[c
][0], tx
[c
][1], tx
[c
][2], tx
[c
][3]);
1141 * Common code for vertex/fragment program texture sampling.
1144 sp_get_samples(struct tgsi_sampler
*tgsi_sampler
,
1145 const float s
[QUAD_SIZE
],
1146 const float t
[QUAD_SIZE
],
1147 const float p
[QUAD_SIZE
],
1148 boolean computeLambda
,
1150 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
1152 const struct sp_shader_sampler
*samp
= sp_shader_sampler(tgsi_sampler
);
1153 const struct softpipe_context
*sp
= samp
->sp
;
1154 const uint unit
= samp
->unit
;
1155 const struct pipe_texture
*texture
= sp
->texture
[unit
];
1156 const struct pipe_sampler_state
*sampler
= sp
->sampler
[unit
];
1161 switch (texture
->target
) {
1162 case PIPE_TEXTURE_1D
:
1163 assert(sampler
->normalized_coords
);
1164 sp_get_samples_1d(tgsi_sampler
, s
, t
, p
, computeLambda
, lodbias
, rgba
);
1166 case PIPE_TEXTURE_2D
:
1167 if (sampler
->normalized_coords
)
1168 sp_get_samples_2d(tgsi_sampler
, s
, t
, p
, computeLambda
, lodbias
, rgba
);
1170 sp_get_samples_rect(tgsi_sampler
, s
, t
, p
, computeLambda
, lodbias
, rgba
);
1172 case PIPE_TEXTURE_3D
:
1173 assert(sampler
->normalized_coords
);
1174 sp_get_samples_3d(tgsi_sampler
, s
, t
, p
, computeLambda
, lodbias
, rgba
);
1176 case PIPE_TEXTURE_CUBE
:
1177 assert(sampler
->normalized_coords
);
1178 sp_get_samples_cube(tgsi_sampler
, s
, t
, p
, computeLambda
, lodbias
, rgba
);
1187 printf("Sampled at %f, %f, %f:\n", s
[0], t
[0], p
[0]);
1188 for (i
= 0; i
< 4; i
++) {
1189 printf("Frag %d: %f %f %f %f\n", i
,
1201 * Called via tgsi_sampler::get_samples() when running a fragment shader.
1202 * Get four filtered RGBA values from the sampler's texture.
1205 sp_get_samples_fragment(struct tgsi_sampler
*tgsi_sampler
,
1206 const float s
[QUAD_SIZE
],
1207 const float t
[QUAD_SIZE
],
1208 const float p
[QUAD_SIZE
],
1210 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
1212 sp_get_samples(tgsi_sampler
, s
, t
, p
, TRUE
, lodbias
, rgba
);
1217 * Called via tgsi_sampler::get_samples() when running a vertex shader.
1218 * Get four filtered RGBA values from the sampler's texture.
1221 sp_get_samples_vertex(struct tgsi_sampler
*tgsi_sampler
,
1222 const float s
[QUAD_SIZE
],
1223 const float t
[QUAD_SIZE
],
1224 const float p
[QUAD_SIZE
],
1226 float rgba
[NUM_CHANNELS
][QUAD_SIZE
])
1228 sp_get_samples(tgsi_sampler
, s
, t
, p
, FALSE
, lodbias
, rgba
);