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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_type.h"
47 #include "gallivm/lp_bld_sample.h"
48 #include "gallivm/lp_bld_tgsi.h"
50 #include "lp_tex_sample.h"
55 * This provides the bridge between the sampler state store in
56 * lp_jit_context and lp_jit_texture and the sampler code
57 * generator. It provides the texture layout information required by
58 * the texture sampler code generator in terms of the state stored in
59 * lp_jit_context and lp_jit_texture in runtime.
61 struct llvmpipe_sampler_dynamic_state
63 struct lp_sampler_dynamic_state base
;
65 const struct lp_sampler_static_state
*static_state
;
67 LLVMValueRef context_ptr
;
72 * This is the bridge between our sampler and the TGSI translator.
74 struct lp_llvm_sampler_soa
76 struct lp_build_sampler_soa base
;
78 struct llvmpipe_sampler_dynamic_state dynamic_state
;
83 * Fetch the specified member of the lp_jit_texture structure.
84 * \param emit_load if TRUE, emit the LLVM load instruction to actually
85 * fetch the field's value. Otherwise, just emit the
86 * GEP code to address the field.
88 * @sa http://llvm.org/docs/GetElementPtr.html
91 lp_llvm_texture_member(const struct lp_sampler_dynamic_state
*base
,
92 LLVMBuilderRef builder
,
94 unsigned member_index
,
95 const char *member_name
,
98 struct llvmpipe_sampler_dynamic_state
*state
=
99 (struct llvmpipe_sampler_dynamic_state
*)base
;
100 LLVMValueRef indices
[4];
104 assert(unit
< PIPE_MAX_SAMPLERS
);
107 indices
[0] = LLVMConstInt(LLVMInt32Type(), 0, 0);
108 /* context[0].textures */
109 indices
[1] = LLVMConstInt(LLVMInt32Type(), LP_JIT_CTX_TEXTURES
, 0);
110 /* context[0].textures[unit] */
111 indices
[2] = LLVMConstInt(LLVMInt32Type(), unit
, 0);
112 /* context[0].textures[unit].member */
113 indices
[3] = LLVMConstInt(LLVMInt32Type(), member_index
, 0);
115 ptr
= LLVMBuildGEP(builder
, state
->context_ptr
, indices
, Elements(indices
), "");
118 res
= LLVMBuildLoad(builder
, ptr
, "");
122 lp_build_name(res
, "context.texture%u.%s", unit
, member_name
);
129 * Helper macro to instantiate the functions that generate the code to
130 * fetch the members of lp_jit_texture to fulfill the sampler code
131 * generator requests.
133 * This complexity is the price we have to pay to keep the texture
134 * sampler code generator a reusable module without dependencies to
135 * llvmpipe internals.
137 #define LP_LLVM_TEXTURE_MEMBER(_name, _index, _emit_load) \
138 static LLVMValueRef \
139 lp_llvm_texture_##_name( const struct lp_sampler_dynamic_state *base, \
140 LLVMBuilderRef builder, \
143 return lp_llvm_texture_member(base, builder, unit, _index, #_name, _emit_load ); \
147 LP_LLVM_TEXTURE_MEMBER(width
, LP_JIT_TEXTURE_WIDTH
, TRUE
)
148 LP_LLVM_TEXTURE_MEMBER(height
, LP_JIT_TEXTURE_HEIGHT
, TRUE
)
149 LP_LLVM_TEXTURE_MEMBER(depth
, LP_JIT_TEXTURE_DEPTH
, TRUE
)
150 LP_LLVM_TEXTURE_MEMBER(last_level
, LP_JIT_TEXTURE_LAST_LEVEL
, TRUE
)
151 LP_LLVM_TEXTURE_MEMBER(row_stride
, LP_JIT_TEXTURE_ROW_STRIDE
, FALSE
)
152 LP_LLVM_TEXTURE_MEMBER(img_stride
, LP_JIT_TEXTURE_IMG_STRIDE
, FALSE
)
153 LP_LLVM_TEXTURE_MEMBER(data_ptr
, LP_JIT_TEXTURE_DATA
, FALSE
)
157 lp_llvm_sampler_soa_destroy(struct lp_build_sampler_soa
*sampler
)
164 * Fetch filtered values from texture.
165 * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
168 lp_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa
*base
,
169 LLVMBuilderRef builder
,
173 const LLVMValueRef
*coords
,
174 const LLVMValueRef
*ddx
,
175 const LLVMValueRef
*ddy
,
176 LLVMValueRef lod_bias
, /* optional */
177 LLVMValueRef explicit_lod
, /* optional */
180 struct lp_llvm_sampler_soa
*sampler
= (struct lp_llvm_sampler_soa
*)base
;
182 assert(unit
< PIPE_MAX_SAMPLERS
);
184 if (LP_PERF
& PERF_NO_TEX
) {
185 lp_build_sample_nop(type
, texel
);
189 lp_build_sample_soa(builder
,
190 &sampler
->dynamic_state
.static_state
[unit
],
191 &sampler
->dynamic_state
.base
,
196 lod_bias
, explicit_lod
,
201 struct lp_build_sampler_soa
*
202 lp_llvm_sampler_soa_create(const struct lp_sampler_static_state
*static_state
,
203 LLVMValueRef context_ptr
)
205 struct lp_llvm_sampler_soa
*sampler
;
207 sampler
= CALLOC_STRUCT(lp_llvm_sampler_soa
);
211 sampler
->base
.destroy
= lp_llvm_sampler_soa_destroy
;
212 sampler
->base
.emit_fetch_texel
= lp_llvm_sampler_soa_emit_fetch_texel
;
213 sampler
->dynamic_state
.base
.width
= lp_llvm_texture_width
;
214 sampler
->dynamic_state
.base
.height
= lp_llvm_texture_height
;
215 sampler
->dynamic_state
.base
.depth
= lp_llvm_texture_depth
;
216 sampler
->dynamic_state
.base
.last_level
= lp_llvm_texture_last_level
;
217 sampler
->dynamic_state
.base
.row_stride
= lp_llvm_texture_row_stride
;
218 sampler
->dynamic_state
.base
.img_stride
= lp_llvm_texture_img_stride
;
219 sampler
->dynamic_state
.base
.data_ptr
= lp_llvm_texture_data_ptr
;
220 sampler
->dynamic_state
.static_state
= static_state
;
221 sampler
->dynamic_state
.context_ptr
= context_ptr
;
223 return &sampler
->base
;