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29 * Texture sampling code generation
31 * This file is nothing more than ugly glue between three largely independent
33 * - TGSI -> LLVM translation (i.e., lp_build_tgsi_soa)
34 * - texture sampling code generation (i.e., lp_build_sample_soa)
37 * All interesting code is in the functions mentioned above. There is really
38 * nothing to see here.
40 * @author Jose Fonseca <jfonseca@vmware.com>
43 #include "pipe/p_defines.h"
44 #include "pipe/p_shader_tokens.h"
45 #include "gallivm/lp_bld_debug.h"
46 #include "gallivm/lp_bld_const.h"
47 #include "gallivm/lp_bld_type.h"
48 #include "gallivm/lp_bld_sample.h"
49 #include "gallivm/lp_bld_tgsi.h"
51 #include "lp_tex_sample.h"
56 * This provides the bridge between the sampler state store in
57 * lp_jit_context and lp_jit_texture and the sampler code
58 * generator. It provides the texture layout information required by
59 * the texture sampler code generator in terms of the state stored in
60 * lp_jit_context and lp_jit_texture in runtime.
62 struct llvmpipe_sampler_dynamic_state
64 struct lp_sampler_dynamic_state base;
66 const struct lp_sampler_static_state *static_state;
68 LLVMValueRef context_ptr;
73 * This is the bridge between our sampler and the TGSI translator.
75 struct lp_llvm_sampler_soa
77 struct lp_build_sampler_soa base;
79 struct llvmpipe_sampler_dynamic_state dynamic_state;
84 * Fetch the specified member of the lp_jit_texture structure.
85 * \param emit_load if TRUE, emit the LLVM load instruction to actually
86 * fetch the field's value. Otherwise, just emit the
87 * GEP code to address the field.
89 * @sa http://llvm.org/docs/GetElementPtr.html
92 lp_llvm_texture_member(const struct lp_sampler_dynamic_state *base,
93 struct gallivm_state *gallivm,
95 unsigned member_index,
96 const char *member_name,
99 struct llvmpipe_sampler_dynamic_state *state =
100 (struct llvmpipe_sampler_dynamic_state *)base;
101 LLVMBuilderRef builder = gallivm->builder;
102 LLVMValueRef indices[4];
106 assert(unit < PIPE_MAX_SAMPLERS);
109 indices[0] = lp_build_const_int32(gallivm, 0);
110 /* context[0].textures */
111 indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_TEXTURES);
112 /* context[0].textures[unit] */
113 indices[2] = lp_build_const_int32(gallivm, unit);
114 /* context[0].textures[unit].member */
115 indices[3] = lp_build_const_int32(gallivm, member_index);
117 ptr = LLVMBuildGEP(builder, state->context_ptr, indices, Elements(indices), "");
120 res = LLVMBuildLoad(builder, ptr, "");
124 lp_build_name(res, "context.texture%u.%s", unit, member_name);
131 * Helper macro to instantiate the functions that generate the code to
132 * fetch the members of lp_jit_texture to fulfill the sampler code
133 * generator requests.
135 * This complexity is the price we have to pay to keep the texture
136 * sampler code generator a reusable module without dependencies to
137 * llvmpipe internals.
139 #define LP_LLVM_TEXTURE_MEMBER(_name, _index, _emit_load) \
140 static LLVMValueRef \
141 lp_llvm_texture_##_name( const struct lp_sampler_dynamic_state *base, \
142 struct gallivm_state *gallivm, \
145 return lp_llvm_texture_member(base, gallivm, unit, _index, #_name, _emit_load ); \
149 LP_LLVM_TEXTURE_MEMBER(width, LP_JIT_TEXTURE_WIDTH, TRUE)
150 LP_LLVM_TEXTURE_MEMBER(height, LP_JIT_TEXTURE_HEIGHT, TRUE)
151 LP_LLVM_TEXTURE_MEMBER(depth, LP_JIT_TEXTURE_DEPTH, TRUE)
152 LP_LLVM_TEXTURE_MEMBER(first_level, LP_JIT_TEXTURE_FIRST_LEVEL, TRUE)
153 LP_LLVM_TEXTURE_MEMBER(last_level, LP_JIT_TEXTURE_LAST_LEVEL, TRUE)
154 LP_LLVM_TEXTURE_MEMBER(row_stride, LP_JIT_TEXTURE_ROW_STRIDE, FALSE)
155 LP_LLVM_TEXTURE_MEMBER(img_stride, LP_JIT_TEXTURE_IMG_STRIDE, FALSE)
156 LP_LLVM_TEXTURE_MEMBER(data_ptr, LP_JIT_TEXTURE_DATA, FALSE)
157 LP_LLVM_TEXTURE_MEMBER(min_lod, LP_JIT_TEXTURE_MIN_LOD, TRUE)
158 LP_LLVM_TEXTURE_MEMBER(max_lod, LP_JIT_TEXTURE_MAX_LOD, TRUE)
159 LP_LLVM_TEXTURE_MEMBER(lod_bias, LP_JIT_TEXTURE_LOD_BIAS, TRUE)
160 LP_LLVM_TEXTURE_MEMBER(border_color, LP_JIT_TEXTURE_BORDER_COLOR, FALSE)
164 lp_llvm_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
171 * Fetch filtered values from texture.
172 * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
175 lp_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
176 struct gallivm_state *gallivm,
180 const LLVMValueRef *coords,
181 const LLVMValueRef *ddx,
182 const LLVMValueRef *ddy,
183 LLVMValueRef lod_bias, /* optional */
184 LLVMValueRef explicit_lod, /* optional */
187 struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
189 assert(unit < PIPE_MAX_SAMPLERS);
191 if (LP_PERF & PERF_NO_TEX) {
192 lp_build_sample_nop(gallivm, type, texel);
196 lp_build_sample_soa(gallivm,
197 &sampler->dynamic_state.static_state[unit],
198 &sampler->dynamic_state.base,
203 lod_bias, explicit_lod,
208 struct lp_build_sampler_soa *
209 lp_llvm_sampler_soa_create(const struct lp_sampler_static_state *static_state,
210 LLVMValueRef context_ptr)
212 struct lp_llvm_sampler_soa *sampler;
214 sampler = CALLOC_STRUCT(lp_llvm_sampler_soa);
218 sampler->base.destroy = lp_llvm_sampler_soa_destroy;
219 sampler->base.emit_fetch_texel = lp_llvm_sampler_soa_emit_fetch_texel;
220 sampler->dynamic_state.base.width = lp_llvm_texture_width;
221 sampler->dynamic_state.base.height = lp_llvm_texture_height;
222 sampler->dynamic_state.base.depth = lp_llvm_texture_depth;
223 sampler->dynamic_state.base.first_level = lp_llvm_texture_first_level;
224 sampler->dynamic_state.base.last_level = lp_llvm_texture_last_level;
225 sampler->dynamic_state.base.row_stride = lp_llvm_texture_row_stride;
226 sampler->dynamic_state.base.img_stride = lp_llvm_texture_img_stride;
227 sampler->dynamic_state.base.data_ptr = lp_llvm_texture_data_ptr;
228 sampler->dynamic_state.base.min_lod = lp_llvm_texture_min_lod;
229 sampler->dynamic_state.base.max_lod = lp_llvm_texture_max_lod;
230 sampler->dynamic_state.base.lod_bias = lp_llvm_texture_lod_bias;
231 sampler->dynamic_state.base.border_color = lp_llvm_texture_border_color;
233 sampler->dynamic_state.static_state = static_state;
234 sampler->dynamic_state.context_ptr = context_ptr;
236 return &sampler->base;