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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 "lp_bld_debug.h"
46 #include "lp_bld_type.h"
47 #include "lp_bld_intr.h"
48 #include "lp_bld_sample.h"
49 #include "lp_bld_tgsi.h"
51 #include "lp_tex_sample.h"
55 * This provides the bridge between the sampler state store in lp_jit_context
56 * and lp_jit_texture and the sampler code generator. It provides the
57 * texture layout information required by the texture sampler code generator
58 * in terms of the state stored in lp_jit_context and lp_jit_texture in runtime.
60 struct llvmpipe_sampler_dynamic_state
62 struct lp_sampler_dynamic_state base
;
64 const struct lp_sampler_static_state
*static_state
;
66 LLVMValueRef context_ptr
;
71 * This is the bridge between our sampler and the TGSI translator.
73 struct lp_llvm_sampler_soa
75 struct lp_build_sampler_soa base
;
77 struct llvmpipe_sampler_dynamic_state dynamic_state
;
82 * Fetch the specified member of the lp_jit_texture structure.
84 * @sa http://llvm.org/docs/GetElementPtr.html
87 lp_llvm_texture_member(struct lp_sampler_dynamic_state
*base
,
88 LLVMBuilderRef builder
,
90 unsigned member_index
,
91 const char *member_name
)
93 struct llvmpipe_sampler_dynamic_state
*state
= (struct llvmpipe_sampler_dynamic_state
*)base
;
94 LLVMValueRef indices
[4];
98 assert(unit
< PIPE_MAX_SAMPLERS
);
101 indices
[0] = LLVMConstInt(LLVMInt32Type(), 0, 0);
102 /* context[0].textures */
103 indices
[1] = LLVMConstInt(LLVMInt32Type(), LP_JIT_CONTEXT_TEXTURES_INDEX
, 0);
104 /* context[0].textures[unit] */
105 indices
[2] = LLVMConstInt(LLVMInt32Type(), unit
, 0);
106 /* context[0].textures[unit].member */
107 indices
[3] = LLVMConstInt(LLVMInt32Type(), member_index
, 0);
109 ptr
= LLVMBuildGEP(builder
, state
->context_ptr
, indices
, Elements(indices
), "");
111 res
= LLVMBuildLoad(builder
, ptr
, "");
113 lp_build_name(res
, "context.texture%u.%s", unit
, member_name
);
120 * Helper macro to instantiate the functions that generate the code to fetch
121 * the members of lp_jit_texture to fulfill the sampler code generator requests.
123 * This complexity is the price we have to pay to keep the texture sampler code
124 * generator a reusable module without dependencies to llvmpipe internals.
126 #define LP_LLVM_TEXTURE_MEMBER(_name, _index) \
127 static LLVMValueRef \
128 lp_llvm_texture_##_name( struct lp_sampler_dynamic_state *base, \
129 LLVMBuilderRef builder, \
132 return lp_llvm_texture_member(base, builder, unit, _index, #_name ); \
136 LP_LLVM_TEXTURE_MEMBER(width
, LP_JIT_TEXTURE_WIDTH
)
137 LP_LLVM_TEXTURE_MEMBER(height
, LP_JIT_TEXTURE_HEIGHT
)
138 LP_LLVM_TEXTURE_MEMBER(stride
, LP_JIT_TEXTURE_STRIDE
)
139 LP_LLVM_TEXTURE_MEMBER(data_ptr
, LP_JIT_TEXTURE_DATA
)
143 lp_llvm_sampler_soa_destroy(struct lp_build_sampler_soa
*sampler
)
150 lp_llvm_sampler_soa_emit_fetch_texel(struct lp_build_sampler_soa
*base
,
151 LLVMBuilderRef builder
,
155 const LLVMValueRef
*coords
,
156 LLVMValueRef lodbias
,
159 struct lp_llvm_sampler_soa
*sampler
= (struct lp_llvm_sampler_soa
*)base
;
161 assert(unit
< PIPE_MAX_SAMPLERS
);
163 lp_build_sample_soa(builder
,
164 &sampler
->dynamic_state
.static_state
[unit
],
165 &sampler
->dynamic_state
.base
,
175 struct lp_build_sampler_soa
*
176 lp_llvm_sampler_soa_create(const struct lp_sampler_static_state
*static_state
,
177 LLVMValueRef context_ptr
)
179 struct lp_llvm_sampler_soa
*sampler
;
181 sampler
= CALLOC_STRUCT(lp_llvm_sampler_soa
);
185 sampler
->base
.destroy
= lp_llvm_sampler_soa_destroy
;
186 sampler
->base
.emit_fetch_texel
= lp_llvm_sampler_soa_emit_fetch_texel
;
187 sampler
->dynamic_state
.base
.width
= lp_llvm_texture_width
;
188 sampler
->dynamic_state
.base
.height
= lp_llvm_texture_height
;
189 sampler
->dynamic_state
.base
.stride
= lp_llvm_texture_stride
;
190 sampler
->dynamic_state
.base
.data_ptr
= lp_llvm_texture_data_ptr
;
191 sampler
->dynamic_state
.static_state
= static_state
;
192 sampler
->dynamic_state
.context_ptr
= context_ptr
;
194 return &sampler
->base
;