src/gallium/drivers/swr/swr_tex_sample.cpp

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  27
  28 /**
  29  * Largely a copy of llvmpipe's lp_tex_sample.c
  30  */
  31
  32 /**
  33  * Texture sampling code generation
  34  *
  35  * This file is nothing more than ugly glue between three largely independent
  36  * entities:
  37  * - TGSI -> LLVM translation (i.e., lp_build_tgsi_soa)
  38  * - texture sampling code generation (i.e., lp_build_sample_soa)
  39  * - SWR driver
  40  *
  41  * All interesting code is in the functions mentioned above. There is really
  42  * nothing to see here.
  43  *
  44  * @author Jose Fonseca <jfonseca@vmware.com>
  45  */
  46
  47 #include "state.h"
  48 #include "JitManager.h"
  49 #include "gen_state_llvm.h"
  50
  51 #include "pipe/p_defines.h"
  52 #include "pipe/p_shader_tokens.h"
  53 #include "gallivm/lp_bld_debug.h"
  54 #include "gallivm/lp_bld_const.h"
  55 #include "gallivm/lp_bld_type.h"
  56 #include "gallivm/lp_bld_sample.h"
  57 #include "gallivm/lp_bld_tgsi.h"
  58 #include "util/u_memory.h"
  59
  60 #include "swr_tex_sample.h"
  61 #include "gen_surf_state_llvm.h"
  62 #include "gen_swr_context_llvm.h"
  63
  64 using namespace SwrJit;
  65
  66 /**
  67  * This provides the bridge between the sampler state store in
  68  * lp_jit_context and lp_jit_texture and the sampler code
  69  * generator. It provides the texture layout information required by
  70  * the texture sampler code generator in terms of the state stored in
  71  * lp_jit_context and lp_jit_texture in runtime.
  72  */
  73 struct swr_sampler_dynamic_state {
  74    struct lp_sampler_dynamic_state base;
  75
  76    const struct swr_sampler_static_state *static_state;
  77
  78    enum pipe_shader_type shader_type;
  79 };
  80
  81
  82 /**
  83  * This is the bridge between our sampler and the TGSI translator.
  84  */
  85 struct swr_sampler_soa {
  86    struct lp_build_sampler_soa base;
  87
  88    struct swr_sampler_dynamic_state dynamic_state;
  89 };
  90
  91
  92 /**
  93  * Fetch the specified member of the lp_jit_texture structure.
  94  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
  95  *                   fetch the field's value.  Otherwise, just emit the
  96  *                   GEP code to address the field.
  97  *
  98  * @sa http://llvm.org/docs/GetElementPtr.html
  99  */
 100 static LLVMValueRef
 101 swr_texture_member(const struct lp_sampler_dynamic_state *base,
 102                    struct gallivm_state *gallivm,
 103                    LLVMValueRef context_ptr,
 104                    unsigned texture_unit,
 105                    unsigned member_index,
 106                    const char *member_name,
 107                    boolean emit_load)
 108 {
 109    LLVMBuilderRef builder = gallivm->builder;
 110    LLVMValueRef indices[4];
 111    LLVMValueRef ptr;
 112    LLVMValueRef res;
 113
 114    assert(texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 115
 116    /* context[0] */
 117    indices[0] = lp_build_const_int32(gallivm, 0);
 118    /* context[0].textures */
 119    auto dynamic = (const struct swr_sampler_dynamic_state *)base;
 120    switch (dynamic->shader_type) {
 121    case PIPE_SHADER_FRAGMENT:
 122       indices[1] = lp_build_const_int32(gallivm, swr_draw_context_texturesFS);
 123       break;
 124    case PIPE_SHADER_VERTEX:
 125       indices[1] = lp_build_const_int32(gallivm, swr_draw_context_texturesVS);
 126       break;
 127    case PIPE_SHADER_GEOMETRY:
 128       indices[1] = lp_build_const_int32(gallivm, swr_draw_context_texturesGS);
 129       break;
 130    default:
 131       assert(0 && "unsupported shader type");
 132       break;
 133    }
 134    /* context[0].textures[unit] */
 135    indices[2] = lp_build_const_int32(gallivm, texture_unit);
 136    /* context[0].textures[unit].member */
 137    indices[3] = lp_build_const_int32(gallivm, member_index);
 138
 139    ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
 140
 141    if (emit_load)
 142       res = LLVMBuildLoad(builder, ptr, "");
 143    else
 144       res = ptr;
 145
 146    lp_build_name(res, "context.texture%u.%s", texture_unit, member_name);
 147
 148    return res;
 149 }
 150
 151
 152 /**
 153  * Helper macro to instantiate the functions that generate the code to
 154  * fetch the members of lp_jit_texture to fulfill the sampler code
 155  * generator requests.
 156  *
 157  * This complexity is the price we have to pay to keep the texture
 158  * sampler code generator a reusable module without dependencies to
 159  * swr internals.
 160  */
 161 #define SWR_TEXTURE_MEMBER(_name, _emit_load)                                \
 162    static LLVMValueRef swr_texture_##_name(                                  \
 163       const struct lp_sampler_dynamic_state *base,                           \
 164       struct gallivm_state *gallivm,                                         \
 165       LLVMValueRef context_ptr,                                              \
 166       unsigned texture_unit)                                                 \
 167    {                                                                         \
 168       return swr_texture_member(base,                                        \
 169                                 gallivm,                                     \
 170                                 context_ptr,                                 \
 171                                 texture_unit,                                \
 172                                 swr_jit_texture_##_name,                     \
 173                                 #_name,                                      \
 174                                 _emit_load);                                 \
 175    }
 176
 177
 178 SWR_TEXTURE_MEMBER(width, TRUE)
 179 SWR_TEXTURE_MEMBER(height, TRUE)
 180 SWR_TEXTURE_MEMBER(depth, TRUE)
 181 SWR_TEXTURE_MEMBER(first_level, TRUE)
 182 SWR_TEXTURE_MEMBER(last_level, TRUE)
 183 SWR_TEXTURE_MEMBER(base_ptr, TRUE)
 184 SWR_TEXTURE_MEMBER(row_stride, FALSE)
 185 SWR_TEXTURE_MEMBER(img_stride, FALSE)
 186 SWR_TEXTURE_MEMBER(mip_offsets, FALSE)
 187
 188
 189 /**
 190  * Fetch the specified member of the lp_jit_sampler structure.
 191  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
 192  *                   fetch the field's value.  Otherwise, just emit the
 193  *                   GEP code to address the field.
 194  *
 195  * @sa http://llvm.org/docs/GetElementPtr.html
 196  */
 197 static LLVMValueRef
 198 swr_sampler_member(const struct lp_sampler_dynamic_state *base,
 199                    struct gallivm_state *gallivm,
 200                    LLVMValueRef context_ptr,
 201                    unsigned sampler_unit,
 202                    unsigned member_index,
 203                    const char *member_name,
 204                    boolean emit_load)
 205 {
 206    LLVMBuilderRef builder = gallivm->builder;
 207    LLVMValueRef indices[4];
 208    LLVMValueRef ptr;
 209    LLVMValueRef res;
 210
 211    assert(sampler_unit < PIPE_MAX_SAMPLERS);
 212
 213    /* context[0] */
 214    indices[0] = lp_build_const_int32(gallivm, 0);
 215    /* context[0].samplers */
 216    auto dynamic = (const struct swr_sampler_dynamic_state *)base;
 217    switch (dynamic->shader_type) {
 218    case PIPE_SHADER_FRAGMENT:
 219       indices[1] = lp_build_const_int32(gallivm, swr_draw_context_samplersFS);
 220       break;
 221    case PIPE_SHADER_VERTEX:
 222       indices[1] = lp_build_const_int32(gallivm, swr_draw_context_samplersVS);
 223       break;
 224    case PIPE_SHADER_GEOMETRY:
 225       indices[1] = lp_build_const_int32(gallivm, swr_draw_context_samplersGS);
 226       break;
 227    default:
 228       assert(0 && "unsupported shader type");
 229       break;
 230    }
 231    /* context[0].samplers[unit] */
 232    indices[2] = lp_build_const_int32(gallivm, sampler_unit);
 233    /* context[0].samplers[unit].member */
 234    indices[3] = lp_build_const_int32(gallivm, member_index);
 235
 236    ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
 237
 238    if (emit_load)
 239       res = LLVMBuildLoad(builder, ptr, "");
 240    else
 241       res = ptr;
 242
 243    lp_build_name(res, "context.sampler%u.%s", sampler_unit, member_name);
 244
 245    return res;
 246 }
 247
 248
 249 #define SWR_SAMPLER_MEMBER(_name, _emit_load)                                \
 250    static LLVMValueRef swr_sampler_##_name(                                  \
 251       const struct lp_sampler_dynamic_state *base,                           \
 252       struct gallivm_state *gallivm,                                         \
 253       LLVMValueRef context_ptr,                                              \
 254       unsigned sampler_unit)                                                 \
 255    {                                                                         \
 256       return swr_sampler_member(base,                                        \
 257                                 gallivm,                                     \
 258                                 context_ptr,                                 \
 259                                 sampler_unit,                                \
 260                                 swr_jit_sampler_##_name,                     \
 261                                 #_name,                                      \
 262                                 _emit_load);                                 \
 263    }
 264
 265
 266 SWR_SAMPLER_MEMBER(min_lod, TRUE)
 267 SWR_SAMPLER_MEMBER(max_lod, TRUE)
 268 SWR_SAMPLER_MEMBER(lod_bias, TRUE)
 269 SWR_SAMPLER_MEMBER(border_color, FALSE)
 270
 271
 272 static void
 273 swr_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
 274 {
 275    FREE(sampler);
 276 }
 277
 278
 279 /**
 280  * Fetch filtered values from texture.
 281  * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
 282  */
 283 static void
 284 swr_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
 285                                  struct gallivm_state *gallivm,
 286                                  const struct lp_sampler_params *params)
 287 {
 288    struct swr_sampler_soa *sampler = (struct swr_sampler_soa *)base;
 289    unsigned texture_index = params->texture_index;
 290    unsigned sampler_index = params->sampler_index;
 291
 292    assert(sampler_index < PIPE_MAX_SAMPLERS);
 293    assert(texture_index < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 294
 295 #if 0
 296       lp_build_sample_nop(gallivm, params->type, params->coords, params->texel);
 297 #else
 298    lp_build_sample_soa(
 299       &sampler->dynamic_state.static_state[texture_index].texture_state,
 300       &sampler->dynamic_state.static_state[sampler_index].sampler_state,
 301       &sampler->dynamic_state.base,
 302       gallivm,
 303       params);
 304 #endif
 305 }
 306
 307 /**
 308  * Fetch the texture size.
 309  */
 310 static void
 311 swr_sampler_soa_emit_size_query(const struct lp_build_sampler_soa *base,
 312                                 struct gallivm_state *gallivm,
 313                                 const struct lp_sampler_size_query_params *params)
 314 {
 315    struct swr_sampler_soa *sampler = (struct swr_sampler_soa *)base;
 316
 317    assert(params->texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 318
 319    lp_build_size_query_soa(
 320       gallivm,
 321       &sampler->dynamic_state.static_state[params->texture_unit].texture_state,
 322       &sampler->dynamic_state.base,
 323       params);
 324 }
 325
 326
 327 struct lp_build_sampler_soa *
 328 swr_sampler_soa_create(const struct swr_sampler_static_state *static_state,
 329                        enum pipe_shader_type shader_type)
 330 {
 331    struct swr_sampler_soa *sampler;
 332
 333    sampler = CALLOC_STRUCT(swr_sampler_soa);
 334    if (!sampler)
 335       return NULL;
 336
 337    sampler->base.destroy = swr_sampler_soa_destroy;
 338    sampler->base.emit_tex_sample = swr_sampler_soa_emit_fetch_texel;
 339    sampler->base.emit_size_query = swr_sampler_soa_emit_size_query;
 340    sampler->dynamic_state.base.width = swr_texture_width;
 341    sampler->dynamic_state.base.height = swr_texture_height;
 342    sampler->dynamic_state.base.depth = swr_texture_depth;
 343    sampler->dynamic_state.base.first_level = swr_texture_first_level;
 344    sampler->dynamic_state.base.last_level = swr_texture_last_level;
 345    sampler->dynamic_state.base.base_ptr = swr_texture_base_ptr;
 346    sampler->dynamic_state.base.row_stride = swr_texture_row_stride;
 347    sampler->dynamic_state.base.img_stride = swr_texture_img_stride;
 348    sampler->dynamic_state.base.mip_offsets = swr_texture_mip_offsets;
 349    sampler->dynamic_state.base.min_lod = swr_sampler_min_lod;
 350    sampler->dynamic_state.base.max_lod = swr_sampler_max_lod;
 351    sampler->dynamic_state.base.lod_bias = swr_sampler_lod_bias;
 352    sampler->dynamic_state.base.border_color = swr_sampler_border_color;
 353
 354    sampler->dynamic_state.static_state = static_state;
 355
 356    sampler->dynamic_state.shader_type = shader_type;
 357
 358    return &sampler->base;
 359 }