1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
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11 * permit persons to whom the Software is furnished to do so, subject to
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14 * The above copyright notice and this permission notice (including the
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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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 **************************************************************************/
30 * Texture sampling -- common code.
32 * @author Jose Fonseca <jfonseca@vmware.com>
35 #include "pipe/p_defines.h"
36 #include "pipe/p_state.h"
37 #include "util/u_format.h"
38 #include "util/u_math.h"
39 #include "lp_bld_debug.h"
40 #include "lp_bld_const.h"
41 #include "lp_bld_arit.h"
42 #include "lp_bld_type.h"
43 #include "lp_bld_sample.h"
47 * Initialize lp_sampler_static_state object with the gallium sampler
49 * The former is considered to be static and the later dynamic.
52 lp_sampler_static_state(struct lp_sampler_static_state
*state
,
53 const struct pipe_sampler_view
*view
,
54 const struct pipe_sampler_state
*sampler
)
56 const struct pipe_resource
*texture
= view
->texture
;
58 memset(state
, 0, sizeof *state
);
67 * We don't copy sampler state over unless it is actually enabled, to avoid
68 * spurious recompiles, as the sampler static state is part of the shader
71 * Ideally the state tracker or cso_cache module would make all state
72 * canonical, but until that happens it's better to be safe than sorry here.
74 * XXX: Actually there's much more than can be done here, especially
75 * regarding 1D/2D/3D/CUBE textures, wrap modes, etc.
78 state
->format
= view
->format
;
79 state
->swizzle_r
= view
->swizzle_r
;
80 state
->swizzle_g
= view
->swizzle_g
;
81 state
->swizzle_b
= view
->swizzle_b
;
82 state
->swizzle_a
= view
->swizzle_a
;
84 state
->target
= texture
->target
;
85 state
->pot_width
= util_is_pot(texture
->width0
);
86 state
->pot_height
= util_is_pot(texture
->height0
);
87 state
->pot_depth
= util_is_pot(texture
->depth0
);
89 state
->wrap_s
= sampler
->wrap_s
;
90 state
->wrap_t
= sampler
->wrap_t
;
91 state
->wrap_r
= sampler
->wrap_r
;
92 state
->min_img_filter
= sampler
->min_img_filter
;
93 state
->mag_img_filter
= sampler
->mag_img_filter
;
94 if (view
->last_level
) {
95 state
->min_mip_filter
= sampler
->min_mip_filter
;
97 state
->min_mip_filter
= PIPE_TEX_MIPFILTER_NONE
;
100 state
->compare_mode
= sampler
->compare_mode
;
101 if (sampler
->compare_mode
!= PIPE_TEX_COMPARE_NONE
) {
102 state
->compare_func
= sampler
->compare_func
;
105 state
->normalized_coords
= sampler
->normalized_coords
;
106 state
->lod_bias
= sampler
->lod_bias
;
107 if (!view
->last_level
&&
108 sampler
->min_img_filter
== sampler
->mag_img_filter
) {
109 state
->min_lod
= 0.0f
;
110 state
->max_lod
= 0.0f
;
112 state
->min_lod
= MAX2(sampler
->min_lod
, 0.0f
);
113 state
->max_lod
= sampler
->max_lod
;
115 state
->border_color
[0] = sampler
->border_color
[0];
116 state
->border_color
[1] = sampler
->border_color
[1];
117 state
->border_color
[2] = sampler
->border_color
[2];
118 state
->border_color
[3] = sampler
->border_color
[3];
121 * FIXME: Handle the remainder of pipe_sampler_view.
127 * Compute the offset of a pixel block.
129 * x, y, z, y_stride, z_stride are vectors, and they refer to pixels.
131 * Returns the relative offset and i,j sub-block coordinates
134 lp_build_sample_offset(struct lp_build_context
*bld
,
135 const struct util_format_description
*format_desc
,
139 LLVMValueRef y_stride
,
140 LLVMValueRef z_stride
,
141 LLVMValueRef
*out_offset
,
145 LLVMValueRef x_stride
;
151 * Describe the coordinates in terms of pixel blocks.
153 * TODO: pixel blocks are power of two. LLVM should convert rem/div to
154 * bit arithmetic. Verify this.
157 if (format_desc
->block
.width
== 1) {
161 LLVMValueRef block_width
= lp_build_const_int_vec(bld
->type
, format_desc
->block
.width
);
162 i
= LLVMBuildURem(bld
->builder
, x
, block_width
, "");
163 x
= LLVMBuildUDiv(bld
->builder
, x
, block_width
, "");
166 if (format_desc
->block
.height
== 1) {
170 LLVMValueRef block_height
= lp_build_const_int_vec(bld
->type
, format_desc
->block
.height
);
171 j
= LLVMBuildURem(bld
->builder
, y
, block_height
, "");
172 y
= LLVMBuildUDiv(bld
->builder
, y
, block_height
, "");
175 x_stride
= lp_build_const_vec(bld
->type
, format_desc
->block
.bits
/8);
176 offset
= lp_build_mul(bld
, x
, x_stride
);
179 LLVMValueRef y_offset
= lp_build_mul(bld
, y
, y_stride
);
180 offset
= lp_build_add(bld
, offset
, y_offset
);
184 LLVMValueRef z_offset
= lp_build_mul(bld
, z
, z_stride
);
185 offset
= lp_build_add(bld
, offset
, z_offset
);
188 *out_offset
= offset
;