src/gallium/drivers/llvmpipe/lp_tex_sample.c

   1 /**************************************************************************
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   3  * Copyright 2009 VMware, Inc.
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  26  **************************************************************************/
  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_state_fs.h"
  53 #include "lp_debug.h"
  54
  55
  56 /**
  57  * This provides the bridge between the sampler state store in
  58  * lp_jit_context and lp_jit_texture and the sampler code
  59  * generator. It provides the texture layout information required by
  60  * the texture sampler code generator in terms of the state stored in
  61  * lp_jit_context and lp_jit_texture in runtime.
  62  */
  63 struct llvmpipe_sampler_dynamic_state
  64 {
  65    struct lp_sampler_dynamic_state base;
  66
  67    const struct lp_sampler_static_state *static_state;
  68 };
  69
  70
  71 /**
  72  * This is the bridge between our sampler and the TGSI translator.
  73  */
  74 struct lp_llvm_sampler_soa
  75 {
  76    struct lp_build_sampler_soa base;
  77
  78    struct llvmpipe_sampler_dynamic_state dynamic_state;
  79 };
  80
  81 struct llvmpipe_image_dynamic_state
  82 {
  83    struct lp_sampler_dynamic_state base;
  84
  85    const struct lp_image_static_state *static_state;
  86 };
  87
  88 /**
  89  * This is the bridge between our sampler and the TGSI translator.
  90  */
  91 struct lp_llvm_image_soa
  92 {
  93    struct lp_build_image_soa base;
  94
  95    struct llvmpipe_image_dynamic_state dynamic_state;
  96 };
  97
  98
  99 /**
 100  * Fetch the specified member of the lp_jit_texture structure.
 101  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
 102  *                   fetch the field's value.  Otherwise, just emit the
 103  *                   GEP code to address the field.
 104  *
 105  * @sa http://llvm.org/docs/GetElementPtr.html
 106  */
 107 static LLVMValueRef
 108 lp_llvm_texture_member(const struct lp_sampler_dynamic_state *base,
 109                        struct gallivm_state *gallivm,
 110                        LLVMValueRef context_ptr,
 111                        unsigned texture_unit,
 112                        unsigned member_index,
 113                        const char *member_name,
 114                        boolean emit_load)
 115 {
 116    LLVMBuilderRef builder = gallivm->builder;
 117    LLVMValueRef indices[4];
 118    LLVMValueRef ptr;
 119    LLVMValueRef res;
 120
 121    assert(texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 122
 123    /* context[0] */
 124    indices[0] = lp_build_const_int32(gallivm, 0);
 125    /* context[0].textures */
 126    indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_TEXTURES);
 127    /* context[0].textures[unit] */
 128    indices[2] = lp_build_const_int32(gallivm, texture_unit);
 129    /* context[0].textures[unit].member */
 130    indices[3] = lp_build_const_int32(gallivm, member_index);
 131
 132    ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
 133
 134    if (emit_load)
 135       res = LLVMBuildLoad(builder, ptr, "");
 136    else
 137       res = ptr;
 138
 139    lp_build_name(res, "context.texture%u.%s", texture_unit, member_name);
 140
 141    return res;
 142 }
 143
 144
 145 /**
 146  * Helper macro to instantiate the functions that generate the code to
 147  * fetch the members of lp_jit_texture to fulfill the sampler code
 148  * generator requests.
 149  *
 150  * This complexity is the price we have to pay to keep the texture
 151  * sampler code generator a reusable module without dependencies to
 152  * llvmpipe internals.
 153  */
 154 #define LP_LLVM_TEXTURE_MEMBER(_name, _index, _emit_load)  \
 155    static LLVMValueRef \
 156    lp_llvm_texture_##_name( const struct lp_sampler_dynamic_state *base, \
 157                             struct gallivm_state *gallivm, \
 158                             LLVMValueRef context_ptr, \
 159                             unsigned texture_unit) \
 160    { \
 161       return lp_llvm_texture_member(base, gallivm, context_ptr, \
 162                                     texture_unit, _index, #_name, _emit_load ); \
 163    }
 164
 165
 166 LP_LLVM_TEXTURE_MEMBER(width,      LP_JIT_TEXTURE_WIDTH, TRUE)
 167 LP_LLVM_TEXTURE_MEMBER(height,     LP_JIT_TEXTURE_HEIGHT, TRUE)
 168 LP_LLVM_TEXTURE_MEMBER(depth,      LP_JIT_TEXTURE_DEPTH, TRUE)
 169 LP_LLVM_TEXTURE_MEMBER(first_level, LP_JIT_TEXTURE_FIRST_LEVEL, TRUE)
 170 LP_LLVM_TEXTURE_MEMBER(last_level, LP_JIT_TEXTURE_LAST_LEVEL, TRUE)
 171 LP_LLVM_TEXTURE_MEMBER(base_ptr,   LP_JIT_TEXTURE_BASE, TRUE)
 172 LP_LLVM_TEXTURE_MEMBER(row_stride, LP_JIT_TEXTURE_ROW_STRIDE, FALSE)
 173 LP_LLVM_TEXTURE_MEMBER(img_stride, LP_JIT_TEXTURE_IMG_STRIDE, FALSE)
 174 LP_LLVM_TEXTURE_MEMBER(mip_offsets, LP_JIT_TEXTURE_MIP_OFFSETS, FALSE)
 175
 176
 177 /**
 178  * Fetch the specified member of the lp_jit_sampler structure.
 179  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
 180  *                   fetch the field's value.  Otherwise, just emit the
 181  *                   GEP code to address the field.
 182  *
 183  * @sa http://llvm.org/docs/GetElementPtr.html
 184  */
 185 static LLVMValueRef
 186 lp_llvm_sampler_member(const struct lp_sampler_dynamic_state *base,
 187                        struct gallivm_state *gallivm,
 188                        LLVMValueRef context_ptr,
 189                        unsigned sampler_unit,
 190                        unsigned member_index,
 191                        const char *member_name,
 192                        boolean emit_load)
 193 {
 194    LLVMBuilderRef builder = gallivm->builder;
 195    LLVMValueRef indices[4];
 196    LLVMValueRef ptr;
 197    LLVMValueRef res;
 198
 199    assert(sampler_unit < PIPE_MAX_SAMPLERS);
 200
 201    /* context[0] */
 202    indices[0] = lp_build_const_int32(gallivm, 0);
 203    /* context[0].samplers */
 204    indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_SAMPLERS);
 205    /* context[0].samplers[unit] */
 206    indices[2] = lp_build_const_int32(gallivm, sampler_unit);
 207    /* context[0].samplers[unit].member */
 208    indices[3] = lp_build_const_int32(gallivm, member_index);
 209
 210    ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
 211
 212    if (emit_load)
 213       res = LLVMBuildLoad(builder, ptr, "");
 214    else
 215       res = ptr;
 216
 217    lp_build_name(res, "context.sampler%u.%s", sampler_unit, member_name);
 218
 219    return res;
 220 }
 221
 222
 223 #define LP_LLVM_SAMPLER_MEMBER(_name, _index, _emit_load)  \
 224    static LLVMValueRef \
 225    lp_llvm_sampler_##_name( const struct lp_sampler_dynamic_state *base, \
 226                             struct gallivm_state *gallivm, \
 227                             LLVMValueRef context_ptr, \
 228                             unsigned sampler_unit) \
 229    { \
 230       return lp_llvm_sampler_member(base, gallivm, context_ptr, \
 231                                     sampler_unit, _index, #_name, _emit_load ); \
 232    }
 233
 234
 235 LP_LLVM_SAMPLER_MEMBER(min_lod,    LP_JIT_SAMPLER_MIN_LOD, TRUE)
 236 LP_LLVM_SAMPLER_MEMBER(max_lod,    LP_JIT_SAMPLER_MAX_LOD, TRUE)
 237 LP_LLVM_SAMPLER_MEMBER(lod_bias,   LP_JIT_SAMPLER_LOD_BIAS, TRUE)
 238 LP_LLVM_SAMPLER_MEMBER(border_color, LP_JIT_SAMPLER_BORDER_COLOR, FALSE)
 239
 240
 241 /**
 242  * Fetch the specified member of the lp_jit_image structure.
 243  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
 244  *                   fetch the field's value.  Otherwise, just emit the
 245  *                   GEP code to address the field.
 246  *
 247  * @sa http://llvm.org/docs/GetElementPtr.html
 248  */
 249 static LLVMValueRef
 250 lp_llvm_image_member(const struct lp_sampler_dynamic_state *base,
 251                      struct gallivm_state *gallivm,
 252                      LLVMValueRef context_ptr,
 253                      unsigned image_unit,
 254                      unsigned member_index,
 255                      const char *member_name,
 256                      boolean emit_load)
 257 {
 258    LLVMBuilderRef builder = gallivm->builder;
 259    LLVMValueRef indices[4];
 260    LLVMValueRef ptr;
 261    LLVMValueRef res;
 262
 263    assert(image_unit < PIPE_MAX_SHADER_IMAGES);
 264
 265    /* context[0] */
 266    indices[0] = lp_build_const_int32(gallivm, 0);
 267    /* context[0].images */
 268    indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_IMAGES);
 269    /* context[0].images[unit] */
 270    indices[2] = lp_build_const_int32(gallivm, image_unit);
 271    /* context[0].images[unit].member */
 272    indices[3] = lp_build_const_int32(gallivm, member_index);
 273
 274    ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
 275
 276    if (emit_load)
 277       res = LLVMBuildLoad(builder, ptr, "");
 278    else
 279       res = ptr;
 280
 281    lp_build_name(res, "context.image%u.%s", image_unit, member_name);
 282
 283    return res;
 284 }
 285
 286
 287 /**
 288  * Helper macro to instantiate the functions that generate the code to
 289  * fetch the members of lp_jit_image to fulfill the sampler code
 290  * generator requests.
 291  *
 292  * This complexity is the price we have to pay to keep the image
 293  * sampler code generator a reusable module without dependencies to
 294  * llvmpipe internals.
 295  */
 296 #define LP_LLVM_IMAGE_MEMBER(_name, _index, _emit_load)  \
 297    static LLVMValueRef \
 298    lp_llvm_image_##_name( const struct lp_sampler_dynamic_state *base, \
 299                             struct gallivm_state *gallivm, \
 300                             LLVMValueRef context_ptr, \
 301                             unsigned image_unit) \
 302    { \
 303       return lp_llvm_image_member(base, gallivm, context_ptr, \
 304                                     image_unit, _index, #_name, _emit_load ); \
 305    }
 306
 307
 308 LP_LLVM_IMAGE_MEMBER(width,      LP_JIT_IMAGE_WIDTH, TRUE)
 309 LP_LLVM_IMAGE_MEMBER(height,     LP_JIT_IMAGE_HEIGHT, TRUE)
 310 LP_LLVM_IMAGE_MEMBER(depth,      LP_JIT_IMAGE_DEPTH, TRUE)
 311 LP_LLVM_IMAGE_MEMBER(base_ptr,   LP_JIT_IMAGE_BASE, TRUE)
 312 LP_LLVM_IMAGE_MEMBER(row_stride, LP_JIT_IMAGE_ROW_STRIDE, TRUE)
 313 LP_LLVM_IMAGE_MEMBER(img_stride, LP_JIT_IMAGE_IMG_STRIDE, TRUE)
 314
 315 #if LP_USE_TEXTURE_CACHE
 316 static LLVMValueRef
 317 lp_llvm_texture_cache_ptr(const struct lp_sampler_dynamic_state *base,
 318                           struct gallivm_state *gallivm,
 319                           LLVMValueRef thread_data_ptr,
 320                           unsigned unit)
 321 {
 322    /* We use the same cache for all units */
 323    (void)unit;
 324
 325    return lp_jit_thread_data_cache(gallivm, thread_data_ptr);
 326 }
 327 #endif
 328
 329
 330 static void
 331 lp_llvm_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
 332 {
 333    FREE(sampler);
 334 }
 335
 336
 337 /**
 338  * Fetch filtered values from texture.
 339  * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
 340  */
 341 static void
 342 lp_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
 343                                      struct gallivm_state *gallivm,
 344                                      const struct lp_sampler_params *params)
 345 {
 346    struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
 347    unsigned texture_index = params->texture_index;
 348    unsigned sampler_index = params->sampler_index;
 349
 350    assert(sampler_index < PIPE_MAX_SAMPLERS);
 351    assert(texture_index < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 352
 353    if (LP_PERF & PERF_NO_TEX) {
 354       lp_build_sample_nop(gallivm, params->type, params->coords, params->texel);
 355       return;
 356    }
 357
 358    lp_build_sample_soa(&sampler->dynamic_state.static_state[texture_index].texture_state,
 359                        &sampler->dynamic_state.static_state[sampler_index].sampler_state,
 360                        &sampler->dynamic_state.base,
 361                        gallivm, params);
 362 }
 363
 364 /**
 365  * Fetch the texture size.
 366  */
 367 static void
 368 lp_llvm_sampler_soa_emit_size_query(const struct lp_build_sampler_soa *base,
 369                                     struct gallivm_state *gallivm,
 370                                     const struct lp_sampler_size_query_params *params)
 371 {
 372    struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
 373
 374    assert(params->texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 375
 376    lp_build_size_query_soa(gallivm,
 377                            &sampler->dynamic_state.static_state[params->texture_unit].texture_state,
 378                            &sampler->dynamic_state.base,
 379                            params);
 380 }
 381
 382
 383 struct lp_build_sampler_soa *
 384 lp_llvm_sampler_soa_create(const struct lp_sampler_static_state *static_state)
 385 {
 386    struct lp_llvm_sampler_soa *sampler;
 387
 388    sampler = CALLOC_STRUCT(lp_llvm_sampler_soa);
 389    if (!sampler)
 390       return NULL;
 391
 392    sampler->base.destroy = lp_llvm_sampler_soa_destroy;
 393    sampler->base.emit_tex_sample = lp_llvm_sampler_soa_emit_fetch_texel;
 394    sampler->base.emit_size_query = lp_llvm_sampler_soa_emit_size_query;
 395    sampler->dynamic_state.base.width = lp_llvm_texture_width;
 396    sampler->dynamic_state.base.height = lp_llvm_texture_height;
 397    sampler->dynamic_state.base.depth = lp_llvm_texture_depth;
 398    sampler->dynamic_state.base.first_level = lp_llvm_texture_first_level;
 399    sampler->dynamic_state.base.last_level = lp_llvm_texture_last_level;
 400    sampler->dynamic_state.base.base_ptr = lp_llvm_texture_base_ptr;
 401    sampler->dynamic_state.base.row_stride = lp_llvm_texture_row_stride;
 402    sampler->dynamic_state.base.img_stride = lp_llvm_texture_img_stride;
 403    sampler->dynamic_state.base.mip_offsets = lp_llvm_texture_mip_offsets;
 404    sampler->dynamic_state.base.min_lod = lp_llvm_sampler_min_lod;
 405    sampler->dynamic_state.base.max_lod = lp_llvm_sampler_max_lod;
 406    sampler->dynamic_state.base.lod_bias = lp_llvm_sampler_lod_bias;
 407    sampler->dynamic_state.base.border_color = lp_llvm_sampler_border_color;
 408
 409 #if LP_USE_TEXTURE_CACHE
 410    sampler->dynamic_state.base.cache_ptr = lp_llvm_texture_cache_ptr;
 411 #endif
 412
 413    sampler->dynamic_state.static_state = static_state;
 414
 415    return &sampler->base;
 416 }
 417
 418 static void
 419 lp_llvm_image_soa_destroy(struct lp_build_image_soa *image)
 420 {
 421    FREE(image);
 422 }
 423
 424 static void
 425 lp_llvm_image_soa_emit_op(const struct lp_build_image_soa *base,
 426                              struct gallivm_state *gallivm,
 427                              const struct lp_img_params *params)
 428 {
 429    struct lp_llvm_image_soa *image = (struct lp_llvm_image_soa *)base;
 430    unsigned image_index = params->image_index;
 431    assert(image_index < PIPE_MAX_SHADER_IMAGES);
 432
 433    lp_build_img_op_soa(&image->dynamic_state.static_state[image_index].image_state,
 434                        &image->dynamic_state.base,
 435                        gallivm, params);
 436 }
 437
 438 /**
 439  * Fetch the texture size.
 440  */
 441 static void
 442 lp_llvm_image_soa_emit_size_query(const struct lp_build_image_soa *base,
 443                                     struct gallivm_state *gallivm,
 444                                     const struct lp_sampler_size_query_params *params)
 445 {
 446    struct lp_llvm_image_soa *image = (struct lp_llvm_image_soa *)base;
 447
 448    assert(params->texture_unit < PIPE_MAX_SHADER_IMAGES);
 449
 450    lp_build_size_query_soa(gallivm,
 451                            &image->dynamic_state.static_state[params->texture_unit].image_state,
 452                            &image->dynamic_state.base,
 453                            params);
 454 }
 455
 456 struct lp_build_image_soa *
 457 lp_llvm_image_soa_create(const struct lp_image_static_state *static_state)
 458 {
 459    struct lp_llvm_image_soa *image;
 460
 461    image = CALLOC_STRUCT(lp_llvm_image_soa);
 462    if (!image)
 463       return NULL;
 464
 465    image->base.destroy = lp_llvm_image_soa_destroy;
 466    image->base.emit_op = lp_llvm_image_soa_emit_op;
 467    image->base.emit_size_query = lp_llvm_image_soa_emit_size_query;
 468
 469    image->dynamic_state.base.width = lp_llvm_image_width;
 470    image->dynamic_state.base.height = lp_llvm_image_height;
 471
 472    image->dynamic_state.base.depth = lp_llvm_image_depth;
 473    image->dynamic_state.base.base_ptr = lp_llvm_image_base_ptr;
 474    image->dynamic_state.base.row_stride = lp_llvm_image_row_stride;
 475    image->dynamic_state.base.img_stride = lp_llvm_image_img_stride;
 476
 477    image->dynamic_state.static_state = static_state;
 478
 479    return &image->base;
 480 }