src/gallium/drivers/llvmpipe/lp_tex_sample.c

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   3  * Copyright 2009 VMware, Inc.
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  27
  28 /**
  29  * Texture sampling code generation
  30  *
  31  * This file is nothing more than ugly glue between three largely independent
  32  * entities:
  33  * - TGSI -> LLVM translation (i.e., lp_build_tgsi_soa)
  34  * - texture sampling code generation (i.e., lp_build_sample_soa)
  35  * - LLVM pipe driver
  36  *
  37  * All interesting code is in the functions mentioned above. There is really
  38  * nothing to see here.
  39  *
  40  * @author Jose Fonseca <jfonseca@vmware.com>
  41  */
  42
  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"
  50 #include "lp_jit.h"
  51 #include "lp_tex_sample.h"
  52 #include "lp_debug.h"
  53
  54
  55 /**
  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.
  61  */
  62 struct llvmpipe_sampler_dynamic_state
  63 {
  64    struct lp_sampler_dynamic_state base;
  65
  66    const struct lp_sampler_static_state *static_state;
  67
  68    LLVMValueRef context_ptr;
  69 };
  70
  71
  72 /**
  73  * This is the bridge between our sampler and the TGSI translator.
  74  */
  75 struct lp_llvm_sampler_soa
  76 {
  77    struct lp_build_sampler_soa base;
  78
  79    struct llvmpipe_sampler_dynamic_state dynamic_state;
  80 };
  81
  82
  83 /**
  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.
  88  *
  89  * @sa http://llvm.org/docs/GetElementPtr.html
  90  */
  91 static LLVMValueRef
  92 lp_llvm_texture_member(const struct lp_sampler_dynamic_state *base,
  93                        struct gallivm_state *gallivm,
  94                        unsigned unit,
  95                        unsigned member_index,
  96                        const char *member_name,
  97                        boolean emit_load)
  98 {
  99    struct llvmpipe_sampler_dynamic_state *state =
 100       (struct llvmpipe_sampler_dynamic_state *)base;
 101    LLVMBuilderRef builder = gallivm->builder;
 102    LLVMValueRef indices[4];
 103    LLVMValueRef ptr;
 104    LLVMValueRef res;
 105
 106    assert(unit < PIPE_MAX_SAMPLERS);
 107
 108    /* context[0] */
 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);
 116
 117    ptr = LLVMBuildGEP(builder, state->context_ptr, indices, Elements(indices), "");
 118
 119    if (emit_load)
 120       res = LLVMBuildLoad(builder, ptr, "");
 121    else
 122       res = ptr;
 123
 124    lp_build_name(res, "context.texture%u.%s", unit, member_name);
 125
 126    return res;
 127 }
 128
 129
 130 /**
 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.
 134  *
 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.
 138  */
 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, \
 143                             unsigned unit) \
 144    { \
 145       return lp_llvm_texture_member(base, gallivm, unit, _index, #_name, _emit_load ); \
 146    }
 147
 148
 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(last_level, LP_JIT_TEXTURE_LAST_LEVEL, TRUE)
 153 LP_LLVM_TEXTURE_MEMBER(row_stride, LP_JIT_TEXTURE_ROW_STRIDE, FALSE)
 154 LP_LLVM_TEXTURE_MEMBER(img_stride, LP_JIT_TEXTURE_IMG_STRIDE, FALSE)
 155 LP_LLVM_TEXTURE_MEMBER(data_ptr,   LP_JIT_TEXTURE_DATA, FALSE)
 156 LP_LLVM_TEXTURE_MEMBER(min_lod,    LP_JIT_TEXTURE_MIN_LOD, TRUE)
 157 LP_LLVM_TEXTURE_MEMBER(max_lod,    LP_JIT_TEXTURE_MAX_LOD, TRUE)
 158 LP_LLVM_TEXTURE_MEMBER(lod_bias,   LP_JIT_TEXTURE_LOD_BIAS, TRUE)
 159 LP_LLVM_TEXTURE_MEMBER(border_color, LP_JIT_TEXTURE_BORDER_COLOR, FALSE)
 160
 161
 162 static void
 163 lp_llvm_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
 164 {
 165    FREE(sampler);
 166 }
 167
 168
 169 /**
 170  * Fetch filtered values from texture.
 171  * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
 172  */
 173 static void
 174 lp_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
 175                                      struct gallivm_state *gallivm,
 176                                      struct lp_type type,
 177                                      unsigned unit,
 178                                      unsigned num_coords,
 179                                      const LLVMValueRef *coords,
 180                                      const LLVMValueRef *ddx,
 181                                      const LLVMValueRef *ddy,
 182                                      LLVMValueRef lod_bias, /* optional */
 183                                      LLVMValueRef explicit_lod, /* optional */
 184                                      LLVMValueRef *texel)
 185 {
 186    struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
 187
 188    assert(unit < PIPE_MAX_SAMPLERS);
 189
 190    if (LP_PERF & PERF_NO_TEX) {
 191       lp_build_sample_nop(gallivm, type, texel);
 192       return;
 193    }
 194
 195    lp_build_sample_soa(gallivm,
 196                        &sampler->dynamic_state.static_state[unit],
 197                        &sampler->dynamic_state.base,
 198                        type,
 199                        unit,
 200                        num_coords, coords,
 201                        ddx, ddy,
 202                        lod_bias, explicit_lod,
 203                        texel);
 204 }
 205
 206
 207 struct lp_build_sampler_soa *
 208 lp_llvm_sampler_soa_create(const struct lp_sampler_static_state *static_state,
 209                            LLVMValueRef context_ptr)
 210 {
 211    struct lp_llvm_sampler_soa *sampler;
 212
 213    sampler = CALLOC_STRUCT(lp_llvm_sampler_soa);
 214    if(!sampler)
 215       return NULL;
 216
 217    sampler->base.destroy = lp_llvm_sampler_soa_destroy;
 218    sampler->base.emit_fetch_texel = lp_llvm_sampler_soa_emit_fetch_texel;
 219    sampler->dynamic_state.base.width = lp_llvm_texture_width;
 220    sampler->dynamic_state.base.height = lp_llvm_texture_height;
 221    sampler->dynamic_state.base.depth = lp_llvm_texture_depth;
 222    sampler->dynamic_state.base.last_level = lp_llvm_texture_last_level;
 223    sampler->dynamic_state.base.row_stride = lp_llvm_texture_row_stride;
 224    sampler->dynamic_state.base.img_stride = lp_llvm_texture_img_stride;
 225    sampler->dynamic_state.base.data_ptr = lp_llvm_texture_data_ptr;
 226    sampler->dynamic_state.base.min_lod = lp_llvm_texture_min_lod;
 227    sampler->dynamic_state.base.max_lod = lp_llvm_texture_max_lod;
 228    sampler->dynamic_state.base.lod_bias = lp_llvm_texture_lod_bias;
 229    sampler->dynamic_state.base.border_color = lp_llvm_texture_border_color;
 230
 231    sampler->dynamic_state.static_state = static_state;
 232    sampler->dynamic_state.context_ptr = context_ptr;
 233
 234    return &sampler->base;
 235 }
 236