1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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,
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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
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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_texture *texture,
55 const struct pipe_sampler_state *sampler)
57 memset(state, 0, sizeof *state);
66 * We don't copy sampler state over unless it is actually enabled, to avoid
67 * spurious recompiles, as the sampler static state is part of the shader
70 * Ideally the state tracker or cso_cache module would make all state
71 * canonical, but until that happens it's better to be safe than sorry here.
73 * XXX: Actually there's much more than can be done here, especially
74 * regarding 1D/2D/3D/CUBE textures, wrap modes, etc.
77 state->format = texture->format;
78 state->target = texture->target;
79 state->pot_width = util_is_pot(texture->width0);
80 state->pot_height = util_is_pot(texture->height0);
81 state->pot_depth = util_is_pot(texture->depth0);
83 state->wrap_s = sampler->wrap_s;
84 state->wrap_t = sampler->wrap_t;
85 state->wrap_r = sampler->wrap_r;
86 state->min_img_filter = sampler->min_img_filter;
87 state->mag_img_filter = sampler->mag_img_filter;
88 if (texture->last_level) {
89 state->min_mip_filter = sampler->min_mip_filter;
91 state->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
94 state->compare_mode = sampler->compare_mode;
95 if (sampler->compare_mode != PIPE_TEX_COMPARE_NONE) {
96 state->compare_func = sampler->compare_func;
99 state->normalized_coords = sampler->normalized_coords;
100 state->lod_bias = sampler->lod_bias;
101 state->min_lod = sampler->min_lod;
102 state->max_lod = sampler->max_lod;
103 state->border_color[0] = sampler->border_color[0];
104 state->border_color[1] = sampler->border_color[1];
105 state->border_color[2] = sampler->border_color[2];
106 state->border_color[3] = sampler->border_color[3];
111 * Gather elements from scatter positions in memory into a single vector.
113 * @param src_width src element width
114 * @param dst_width result element width (source will be expanded to fit)
115 * @param length length of the offsets,
116 * @param base_ptr base pointer, should be a i8 pointer type.
117 * @param offsets vector with offsets
120 lp_build_gather(LLVMBuilderRef builder,
124 LLVMValueRef base_ptr,
125 LLVMValueRef offsets)
127 LLVMTypeRef src_type = LLVMIntType(src_width);
128 LLVMTypeRef src_ptr_type = LLVMPointerType(src_type, 0);
129 LLVMTypeRef dst_elem_type = LLVMIntType(dst_width);
130 LLVMTypeRef dst_vec_type = LLVMVectorType(dst_elem_type, length);
134 res = LLVMGetUndef(dst_vec_type);
135 for(i = 0; i < length; ++i) {
136 LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
137 LLVMValueRef elem_offset;
138 LLVMValueRef elem_ptr;
141 elem_offset = LLVMBuildExtractElement(builder, offsets, index, "");
142 elem_ptr = LLVMBuildGEP(builder, base_ptr, &elem_offset, 1, "");
143 elem_ptr = LLVMBuildBitCast(builder, elem_ptr, src_ptr_type, "");
144 elem = LLVMBuildLoad(builder, elem_ptr, "");
146 assert(src_width <= dst_width);
147 if(src_width > dst_width)
148 elem = LLVMBuildTrunc(builder, elem, dst_elem_type, "");
149 if(src_width < dst_width)
150 elem = LLVMBuildZExt(builder, elem, dst_elem_type, "");
152 res = LLVMBuildInsertElement(builder, res, elem, index, "");
160 * Compute the offset of a pixel block.
162 * x, y, z, y_stride, z_stride are vectors, and they refer to pixel blocks, as
163 * per format description, and not individual pixels.
166 lp_build_sample_offset(struct lp_build_context *bld,
167 const struct util_format_description *format_desc,
171 LLVMValueRef y_stride,
172 LLVMValueRef z_stride)
174 LLVMValueRef x_stride;
177 x_stride = lp_build_const_vec(bld->type, format_desc->block.bits/8);
179 if(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
180 LLVMValueRef x_lo, x_hi;
181 LLVMValueRef y_lo, y_hi;
182 LLVMValueRef x_stride_lo, x_stride_hi;
183 LLVMValueRef y_stride_lo, y_stride_hi;
184 LLVMValueRef x_offset_lo, x_offset_hi;
185 LLVMValueRef y_offset_lo, y_offset_hi;
186 LLVMValueRef offset_lo, offset_hi;
188 /* XXX 1D & 3D addressing not done yet */
192 x_lo = LLVMBuildAnd(bld->builder, x, bld->one, "");
193 y_lo = LLVMBuildAnd(bld->builder, y, bld->one, "");
195 x_hi = LLVMBuildLShr(bld->builder, x, bld->one, "");
196 y_hi = LLVMBuildLShr(bld->builder, y, bld->one, "");
198 x_stride_lo = x_stride;
199 y_stride_lo = lp_build_const_vec(bld->type, 2*format_desc->block.bits/8);
201 x_stride_hi = lp_build_const_vec(bld->type, 4*format_desc->block.bits/8);
202 y_stride_hi = LLVMBuildShl(bld->builder, y_stride, bld->one, "");
204 x_offset_lo = lp_build_mul(bld, x_lo, x_stride_lo);
205 y_offset_lo = lp_build_mul(bld, y_lo, y_stride_lo);
206 offset_lo = lp_build_add(bld, x_offset_lo, y_offset_lo);
208 x_offset_hi = lp_build_mul(bld, x_hi, x_stride_hi);
209 y_offset_hi = lp_build_mul(bld, y_hi, y_stride_hi);
210 offset_hi = lp_build_add(bld, x_offset_hi, y_offset_hi);
212 offset = lp_build_add(bld, offset_hi, offset_lo);
215 offset = lp_build_mul(bld, x, x_stride);
218 LLVMValueRef y_offset = lp_build_mul(bld, y, y_stride);
219 offset = lp_build_add(bld, offset, y_offset);
223 LLVMValueRef z_offset = lp_build_mul(bld, z, z_stride);
224 offset = lp_build_add(bld, offset, z_offset);