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3 * Copyright 2009 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
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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
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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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_format.h"
44 #include "lp_bld_sample.h"
48 * Initialize lp_sampler_static_state object with the gallium sampler
50 * The former is considered to be static and the later dynamic.
53 lp_sampler_static_state(struct lp_sampler_static_state
*state
,
54 const struct pipe_sampler_view
*view
,
55 const struct pipe_sampler_state
*sampler
)
57 const struct pipe_resource
*texture
= view
->texture
;
59 memset(state
, 0, sizeof *state
);
68 * We don't copy sampler state over unless it is actually enabled, to avoid
69 * spurious recompiles, as the sampler static state is part of the shader
72 * Ideally the state tracker or cso_cache module would make all state
73 * canonical, but until that happens it's better to be safe than sorry here.
75 * XXX: Actually there's much more than can be done here, especially
76 * regarding 1D/2D/3D/CUBE textures, wrap modes, etc.
79 state
->format
= view
->format
;
80 state
->swizzle_r
= view
->swizzle_r
;
81 state
->swizzle_g
= view
->swizzle_g
;
82 state
->swizzle_b
= view
->swizzle_b
;
83 state
->swizzle_a
= view
->swizzle_a
;
85 state
->target
= texture
->target
;
86 state
->pot_width
= util_is_pot(texture
->width0
);
87 state
->pot_height
= util_is_pot(texture
->height0
);
88 state
->pot_depth
= util_is_pot(texture
->depth0
);
90 state
->wrap_s
= sampler
->wrap_s
;
91 state
->wrap_t
= sampler
->wrap_t
;
92 state
->wrap_r
= sampler
->wrap_r
;
93 state
->min_img_filter
= sampler
->min_img_filter
;
94 state
->mag_img_filter
= sampler
->mag_img_filter
;
95 if (view
->last_level
) {
96 state
->min_mip_filter
= sampler
->min_mip_filter
;
98 state
->min_mip_filter
= PIPE_TEX_MIPFILTER_NONE
;
101 state
->compare_mode
= sampler
->compare_mode
;
102 if (sampler
->compare_mode
!= PIPE_TEX_COMPARE_NONE
) {
103 state
->compare_func
= sampler
->compare_func
;
106 state
->normalized_coords
= sampler
->normalized_coords
;
107 state
->lod_bias
= sampler
->lod_bias
;
108 if (!view
->last_level
&&
109 sampler
->min_img_filter
== sampler
->mag_img_filter
) {
110 state
->min_lod
= 0.0f
;
111 state
->max_lod
= 0.0f
;
113 state
->min_lod
= MAX2(sampler
->min_lod
, 0.0f
);
114 state
->max_lod
= sampler
->max_lod
;
116 state
->border_color
[0] = sampler
->border_color
[0];
117 state
->border_color
[1] = sampler
->border_color
[1];
118 state
->border_color
[2] = sampler
->border_color
[2];
119 state
->border_color
[3] = sampler
->border_color
[3];
122 * FIXME: Handle the remainder of pipe_sampler_view.
128 * Gather elements from scatter positions in memory into a single vector.
129 * Use for fetching texels from a texture.
130 * For SSE, typical values are length=4, src_width=32, dst_width=32.
132 * @param length length of the offsets
133 * @param src_width src element width in bits
134 * @param dst_width result element width in bits (src will be expanded to fit)
135 * @param base_ptr base pointer, should be a i8 pointer type.
136 * @param offsets vector with offsets
139 lp_build_gather(LLVMBuilderRef builder
,
143 LLVMValueRef base_ptr
,
144 LLVMValueRef offsets
)
146 LLVMTypeRef src_type
= LLVMIntType(src_width
);
147 LLVMTypeRef src_ptr_type
= LLVMPointerType(src_type
, 0);
148 LLVMTypeRef dst_elem_type
= LLVMIntType(dst_width
);
149 LLVMTypeRef dst_vec_type
= LLVMVectorType(dst_elem_type
, length
);
153 res
= LLVMGetUndef(dst_vec_type
);
154 for(i
= 0; i
< length
; ++i
) {
155 LLVMValueRef index
= LLVMConstInt(LLVMInt32Type(), i
, 0);
156 LLVMValueRef elem_offset
;
157 LLVMValueRef elem_ptr
;
160 elem_offset
= LLVMBuildExtractElement(builder
, offsets
, index
, "");
161 elem_ptr
= LLVMBuildGEP(builder
, base_ptr
, &elem_offset
, 1, "");
162 elem_ptr
= LLVMBuildBitCast(builder
, elem_ptr
, src_ptr_type
, "");
163 elem
= LLVMBuildLoad(builder
, elem_ptr
, "");
165 assert(src_width
<= dst_width
);
166 if(src_width
> dst_width
)
167 elem
= LLVMBuildTrunc(builder
, elem
, dst_elem_type
, "");
168 if(src_width
< dst_width
)
169 elem
= LLVMBuildZExt(builder
, elem
, dst_elem_type
, "");
171 res
= LLVMBuildInsertElement(builder
, res
, elem
, index
, "");
179 * Compute the offset of a pixel block.
181 * x, y, z, y_stride, z_stride are vectors, and they refer to pixel blocks, as
182 * per format description, and not individual pixels.
185 lp_build_sample_offset(struct lp_build_context
*bld
,
186 const struct util_format_description
*format_desc
,
190 LLVMValueRef y_stride
,
191 LLVMValueRef z_stride
)
193 LLVMValueRef x_stride
;
196 x_stride
= lp_build_const_vec(bld
->type
, format_desc
->block
.bits
/8);
197 offset
= lp_build_mul(bld
, x
, x_stride
);
200 LLVMValueRef y_offset
= lp_build_mul(bld
, y
, y_stride
);
201 offset
= lp_build_add(bld
, offset
, y_offset
);
205 LLVMValueRef z_offset
= lp_build_mul(bld
, z
, z_stride
);
206 offset
= lp_build_add(bld
, offset
, z_offset
);