src/gallium/drivers/llvmpipe/lp_tex_sample.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All rights reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  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    unsigned nr_samplers;
  80 };
  81
  82 struct llvmpipe_image_dynamic_state
  83 {
  84    struct lp_sampler_dynamic_state base;
  85
  86    const struct lp_image_static_state *static_state;
  87 };
  88
  89 /**
  90  * This is the bridge between our sampler and the TGSI translator.
  91  */
  92 struct lp_llvm_image_soa
  93 {
  94    struct lp_build_image_soa base;
  95
  96    struct llvmpipe_image_dynamic_state dynamic_state;
  97    unsigned nr_images;
  98 };
  99
 100
 101 /**
 102  * Fetch the specified member of the lp_jit_texture structure.
 103  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
 104  *                   fetch the field's value.  Otherwise, just emit the
 105  *                   GEP code to address the field.
 106  *
 107  * @sa http://llvm.org/docs/GetElementPtr.html
 108  */
 109 static LLVMValueRef
 110 lp_llvm_texture_member(const struct lp_sampler_dynamic_state *base,
 111                        struct gallivm_state *gallivm,
 112                        LLVMValueRef context_ptr,
 113                        unsigned texture_unit,
 114                        LLVMValueRef texture_unit_offset,
 115                        unsigned member_index,
 116                        const char *member_name,
 117                        boolean emit_load)
 118 {
 119    LLVMBuilderRef builder = gallivm->builder;
 120    LLVMValueRef indices[4];
 121    LLVMValueRef ptr;
 122    LLVMValueRef res;
 123
 124    assert(texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 125
 126    /* context[0] */
 127    indices[0] = lp_build_const_int32(gallivm, 0);
 128    /* context[0].textures */
 129    indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_TEXTURES);
 130    /* context[0].textures[unit] */
 131    indices[2] = lp_build_const_int32(gallivm, texture_unit);
 132    if (texture_unit_offset) {
 133       indices[2] = LLVMBuildAdd(gallivm->builder, indices[2], texture_unit_offset, "");
 134       LLVMValueRef cond = LLVMBuildICmp(gallivm->builder, LLVMIntULT, indices[2], lp_build_const_int32(gallivm, PIPE_MAX_SHADER_SAMPLER_VIEWS), "");
 135       indices[2] = LLVMBuildSelect(gallivm->builder, cond, indices[2], lp_build_const_int32(gallivm, texture_unit), "");
 136    }
 137    /* context[0].textures[unit].member */
 138    indices[3] = lp_build_const_int32(gallivm, member_index);
 139
 140    ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
 141
 142    if (emit_load)
 143       res = LLVMBuildLoad(builder, ptr, "");
 144    else
 145       res = ptr;
 146
 147    lp_build_name(res, "context.texture%u.%s", texture_unit, member_name);
 148
 149    return res;
 150 }
 151
 152
 153 /**
 154  * Helper macro to instantiate the functions that generate the code to
 155  * fetch the members of lp_jit_texture to fulfill the sampler code
 156  * generator requests.
 157  *
 158  * This complexity is the price we have to pay to keep the texture
 159  * sampler code generator a reusable module without dependencies to
 160  * llvmpipe internals.
 161  */
 162 #define LP_LLVM_TEXTURE_MEMBER(_name, _index, _emit_load)  \
 163    static LLVMValueRef \
 164    lp_llvm_texture_##_name( const struct lp_sampler_dynamic_state *base, \
 165                             struct gallivm_state *gallivm, \
 166                             LLVMValueRef context_ptr, \
 167                             unsigned texture_unit,    \
 168                             LLVMValueRef texture_unit_offset) \
 169    { \
 170       return lp_llvm_texture_member(base, gallivm, context_ptr, \
 171                                     texture_unit, texture_unit_offset,  \
 172                                     _index, #_name, _emit_load );       \
 173    }
 174
 175
 176 LP_LLVM_TEXTURE_MEMBER(width,      LP_JIT_TEXTURE_WIDTH, TRUE)
 177 LP_LLVM_TEXTURE_MEMBER(height,     LP_JIT_TEXTURE_HEIGHT, TRUE)
 178 LP_LLVM_TEXTURE_MEMBER(depth,      LP_JIT_TEXTURE_DEPTH, TRUE)
 179 LP_LLVM_TEXTURE_MEMBER(first_level, LP_JIT_TEXTURE_FIRST_LEVEL, TRUE)
 180 LP_LLVM_TEXTURE_MEMBER(last_level, LP_JIT_TEXTURE_LAST_LEVEL, TRUE)
 181 LP_LLVM_TEXTURE_MEMBER(base_ptr,   LP_JIT_TEXTURE_BASE, TRUE)
 182 LP_LLVM_TEXTURE_MEMBER(row_stride, LP_JIT_TEXTURE_ROW_STRIDE, FALSE)
 183 LP_LLVM_TEXTURE_MEMBER(img_stride, LP_JIT_TEXTURE_IMG_STRIDE, FALSE)
 184 LP_LLVM_TEXTURE_MEMBER(mip_offsets, LP_JIT_TEXTURE_MIP_OFFSETS, FALSE)
 185 LP_LLVM_TEXTURE_MEMBER(num_samples, LP_JIT_TEXTURE_NUM_SAMPLES, TRUE)
 186 LP_LLVM_TEXTURE_MEMBER(sample_stride, LP_JIT_TEXTURE_SAMPLE_STRIDE, TRUE)
 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 lp_llvm_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    indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_SAMPLERS);
 217    /* context[0].samplers[unit] */
 218    indices[2] = lp_build_const_int32(gallivm, sampler_unit);
 219    /* context[0].samplers[unit].member */
 220    indices[3] = lp_build_const_int32(gallivm, member_index);
 221
 222    ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
 223
 224    if (emit_load)
 225       res = LLVMBuildLoad(builder, ptr, "");
 226    else
 227       res = ptr;
 228
 229    lp_build_name(res, "context.sampler%u.%s", sampler_unit, member_name);
 230
 231    return res;
 232 }
 233
 234
 235 #define LP_LLVM_SAMPLER_MEMBER(_name, _index, _emit_load)  \
 236    static LLVMValueRef \
 237    lp_llvm_sampler_##_name( const struct lp_sampler_dynamic_state *base, \
 238                             struct gallivm_state *gallivm, \
 239                             LLVMValueRef context_ptr, \
 240                             unsigned sampler_unit) \
 241    { \
 242       return lp_llvm_sampler_member(base, gallivm, context_ptr, \
 243                                     sampler_unit, _index, #_name, _emit_load ); \
 244    }
 245
 246
 247 LP_LLVM_SAMPLER_MEMBER(min_lod,    LP_JIT_SAMPLER_MIN_LOD, TRUE)
 248 LP_LLVM_SAMPLER_MEMBER(max_lod,    LP_JIT_SAMPLER_MAX_LOD, TRUE)
 249 LP_LLVM_SAMPLER_MEMBER(lod_bias,   LP_JIT_SAMPLER_LOD_BIAS, TRUE)
 250 LP_LLVM_SAMPLER_MEMBER(border_color, LP_JIT_SAMPLER_BORDER_COLOR, FALSE)
 251
 252
 253 /**
 254  * Fetch the specified member of the lp_jit_image structure.
 255  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
 256  *                   fetch the field's value.  Otherwise, just emit the
 257  *                   GEP code to address the field.
 258  *
 259  * @sa http://llvm.org/docs/GetElementPtr.html
 260  */
 261 static LLVMValueRef
 262 lp_llvm_image_member(const struct lp_sampler_dynamic_state *base,
 263                      struct gallivm_state *gallivm,
 264                      LLVMValueRef context_ptr,
 265                      unsigned image_unit,
 266                      LLVMValueRef image_unit_offset,
 267                      unsigned member_index,
 268                      const char *member_name,
 269                      boolean emit_load)
 270 {
 271    LLVMBuilderRef builder = gallivm->builder;
 272    LLVMValueRef indices[4];
 273    LLVMValueRef ptr;
 274    LLVMValueRef res;
 275
 276    assert(image_unit < PIPE_MAX_SHADER_IMAGES);
 277
 278    /* context[0] */
 279    indices[0] = lp_build_const_int32(gallivm, 0);
 280    /* context[0].images */
 281    indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_IMAGES);
 282    /* context[0].images[unit] */
 283    indices[2] = lp_build_const_int32(gallivm, image_unit);
 284    if (image_unit_offset) {
 285       indices[2] = LLVMBuildAdd(gallivm->builder, indices[2], image_unit_offset, "");
 286       LLVMValueRef cond = LLVMBuildICmp(gallivm->builder, LLVMIntULT, indices[2], lp_build_const_int32(gallivm, PIPE_MAX_SHADER_IMAGES), "");
 287       indices[2] = LLVMBuildSelect(gallivm->builder, cond, indices[2], lp_build_const_int32(gallivm, image_unit), "");
 288    }
 289    /* context[0].images[unit].member */
 290    indices[3] = lp_build_const_int32(gallivm, member_index);
 291
 292    ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
 293
 294    if (emit_load)
 295       res = LLVMBuildLoad(builder, ptr, "");
 296    else
 297       res = ptr;
 298
 299    lp_build_name(res, "context.image%u.%s", image_unit, member_name);
 300
 301    return res;
 302 }
 303
 304
 305 /**
 306  * Helper macro to instantiate the functions that generate the code to
 307  * fetch the members of lp_jit_image to fulfill the sampler code
 308  * generator requests.
 309  *
 310  * This complexity is the price we have to pay to keep the image
 311  * sampler code generator a reusable module without dependencies to
 312  * llvmpipe internals.
 313  */
 314 #define LP_LLVM_IMAGE_MEMBER(_name, _index, _emit_load)  \
 315    static LLVMValueRef \
 316    lp_llvm_image_##_name( const struct lp_sampler_dynamic_state *base, \
 317                           struct gallivm_state *gallivm,               \
 318                           LLVMValueRef context_ptr,                     \
 319                           unsigned image_unit, LLVMValueRef image_unit_offset) \
 320    { \
 321       return lp_llvm_image_member(base, gallivm, context_ptr, \
 322                                   image_unit, image_unit_offset, \
 323                                   _index, #_name, _emit_load );  \
 324    }
 325
 326
 327 LP_LLVM_IMAGE_MEMBER(width,      LP_JIT_IMAGE_WIDTH, TRUE)
 328 LP_LLVM_IMAGE_MEMBER(height,     LP_JIT_IMAGE_HEIGHT, TRUE)
 329 LP_LLVM_IMAGE_MEMBER(depth,      LP_JIT_IMAGE_DEPTH, TRUE)
 330 LP_LLVM_IMAGE_MEMBER(base_ptr,   LP_JIT_IMAGE_BASE, TRUE)
 331 LP_LLVM_IMAGE_MEMBER(row_stride, LP_JIT_IMAGE_ROW_STRIDE, TRUE)
 332 LP_LLVM_IMAGE_MEMBER(img_stride, LP_JIT_IMAGE_IMG_STRIDE, TRUE)
 333 LP_LLVM_IMAGE_MEMBER(num_samples, LP_JIT_IMAGE_NUM_SAMPLES, TRUE)
 334 LP_LLVM_IMAGE_MEMBER(sample_stride, LP_JIT_IMAGE_SAMPLE_STRIDE, TRUE)
 335
 336 #if LP_USE_TEXTURE_CACHE
 337 static LLVMValueRef
 338 lp_llvm_texture_cache_ptr(const struct lp_sampler_dynamic_state *base,
 339                           struct gallivm_state *gallivm,
 340                           LLVMValueRef thread_data_ptr,
 341                           unsigned unit)
 342 {
 343    /* We use the same cache for all units */
 344    (void)unit;
 345
 346    return lp_jit_thread_data_cache(gallivm, thread_data_ptr);
 347 }
 348 #endif
 349
 350
 351 static void
 352 lp_llvm_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
 353 {
 354    FREE(sampler);
 355 }
 356
 357
 358 /**
 359  * Fetch filtered values from texture.
 360  * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
 361  */
 362 static void
 363 lp_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
 364                                      struct gallivm_state *gallivm,
 365                                      const struct lp_sampler_params *params)
 366 {
 367    struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
 368    unsigned texture_index = params->texture_index;
 369    unsigned sampler_index = params->sampler_index;
 370
 371    assert(sampler_index < PIPE_MAX_SAMPLERS);
 372    assert(texture_index < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 373
 374    if (LP_PERF & PERF_NO_TEX) {
 375       lp_build_sample_nop(gallivm, params->type, params->coords, params->texel);
 376       return;
 377    }
 378
 379    if (params->texture_index_offset) {
 380       struct lp_build_sample_array_switch switch_info;
 381       memset(&switch_info, 0, sizeof(switch_info));
 382       LLVMValueRef unit = LLVMBuildAdd(gallivm->builder, params->texture_index_offset,
 383                                        lp_build_const_int32(gallivm, texture_index), "");
 384       lp_build_sample_array_init_soa(&switch_info, gallivm, params, unit,
 385                                      0, sampler->nr_samplers);
 386
 387       for (unsigned i = 0; i < sampler->nr_samplers; i++) {
 388          lp_build_sample_array_case_soa(&switch_info, i,
 389                                         &sampler->dynamic_state.static_state[i].texture_state,
 390                                         &sampler->dynamic_state.static_state[i].sampler_state,
 391                                         &sampler->dynamic_state.base);
 392       }
 393       lp_build_sample_array_fini_soa(&switch_info);
 394    } else {
 395       lp_build_sample_soa(&sampler->dynamic_state.static_state[texture_index].texture_state,
 396                           &sampler->dynamic_state.static_state[sampler_index].sampler_state,
 397                           &sampler->dynamic_state.base,
 398                           gallivm, params);
 399    }
 400 }
 401
 402 /**
 403  * Fetch the texture size.
 404  */
 405 static void
 406 lp_llvm_sampler_soa_emit_size_query(const struct lp_build_sampler_soa *base,
 407                                     struct gallivm_state *gallivm,
 408                                     const struct lp_sampler_size_query_params *params)
 409 {
 410    struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
 411
 412    assert(params->texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 413
 414    lp_build_size_query_soa(gallivm,
 415                            &sampler->dynamic_state.static_state[params->texture_unit].texture_state,
 416                            &sampler->dynamic_state.base,
 417                            params);
 418 }
 419
 420
 421 struct lp_build_sampler_soa *
 422 lp_llvm_sampler_soa_create(const struct lp_sampler_static_state *static_state,
 423                            unsigned nr_samplers)
 424 {
 425    struct lp_llvm_sampler_soa *sampler;
 426
 427    sampler = CALLOC_STRUCT(lp_llvm_sampler_soa);
 428    if (!sampler)
 429       return NULL;
 430
 431    sampler->base.destroy = lp_llvm_sampler_soa_destroy;
 432    sampler->base.emit_tex_sample = lp_llvm_sampler_soa_emit_fetch_texel;
 433    sampler->base.emit_size_query = lp_llvm_sampler_soa_emit_size_query;
 434    sampler->dynamic_state.base.width = lp_llvm_texture_width;
 435    sampler->dynamic_state.base.height = lp_llvm_texture_height;
 436    sampler->dynamic_state.base.depth = lp_llvm_texture_depth;
 437    sampler->dynamic_state.base.first_level = lp_llvm_texture_first_level;
 438    sampler->dynamic_state.base.last_level = lp_llvm_texture_last_level;
 439    sampler->dynamic_state.base.base_ptr = lp_llvm_texture_base_ptr;
 440    sampler->dynamic_state.base.row_stride = lp_llvm_texture_row_stride;
 441    sampler->dynamic_state.base.img_stride = lp_llvm_texture_img_stride;
 442    sampler->dynamic_state.base.mip_offsets = lp_llvm_texture_mip_offsets;
 443    sampler->dynamic_state.base.num_samples = lp_llvm_texture_num_samples;
 444    sampler->dynamic_state.base.sample_stride = lp_llvm_texture_sample_stride;
 445    sampler->dynamic_state.base.min_lod = lp_llvm_sampler_min_lod;
 446    sampler->dynamic_state.base.max_lod = lp_llvm_sampler_max_lod;
 447    sampler->dynamic_state.base.lod_bias = lp_llvm_sampler_lod_bias;
 448    sampler->dynamic_state.base.border_color = lp_llvm_sampler_border_color;
 449
 450 #if LP_USE_TEXTURE_CACHE
 451    sampler->dynamic_state.base.cache_ptr = lp_llvm_texture_cache_ptr;
 452 #endif
 453
 454    sampler->dynamic_state.static_state = static_state;
 455
 456    sampler->nr_samplers = nr_samplers;
 457    return &sampler->base;
 458 }
 459
 460 static void
 461 lp_llvm_image_soa_destroy(struct lp_build_image_soa *image)
 462 {
 463    FREE(image);
 464 }
 465
 466 static void
 467 lp_llvm_image_soa_emit_op(const struct lp_build_image_soa *base,
 468                              struct gallivm_state *gallivm,
 469                              const struct lp_img_params *params)
 470 {
 471    struct lp_llvm_image_soa *image = (struct lp_llvm_image_soa *)base;
 472    unsigned image_index = params->image_index;
 473    assert(image_index < PIPE_MAX_SHADER_IMAGES);
 474
 475    lp_build_img_op_soa(&image->dynamic_state.static_state[image_index].image_state,
 476                        &image->dynamic_state.base,
 477                        gallivm, params, params->outdata);
 478 }
 479
 480 /**
 481  * Fetch the texture size.
 482  */
 483 static void
 484 lp_llvm_image_soa_emit_size_query(const struct lp_build_image_soa *base,
 485                                     struct gallivm_state *gallivm,
 486                                     const struct lp_sampler_size_query_params *params)
 487 {
 488    struct lp_llvm_image_soa *image = (struct lp_llvm_image_soa *)base;
 489
 490    assert(params->texture_unit < PIPE_MAX_SHADER_IMAGES);
 491
 492    lp_build_size_query_soa(gallivm,
 493                            &image->dynamic_state.static_state[params->texture_unit].image_state,
 494                            &image->dynamic_state.base,
 495                            params);
 496 }
 497
 498 struct lp_build_image_soa *
 499 lp_llvm_image_soa_create(const struct lp_image_static_state *static_state,
 500                          unsigned nr_images)
 501 {
 502    struct lp_llvm_image_soa *image;
 503
 504    image = CALLOC_STRUCT(lp_llvm_image_soa);
 505    if (!image)
 506       return NULL;
 507
 508    image->base.destroy = lp_llvm_image_soa_destroy;
 509    image->base.emit_op = lp_llvm_image_soa_emit_op;
 510    image->base.emit_size_query = lp_llvm_image_soa_emit_size_query;
 511
 512    image->dynamic_state.base.width = lp_llvm_image_width;
 513    image->dynamic_state.base.height = lp_llvm_image_height;
 514
 515    image->dynamic_state.base.depth = lp_llvm_image_depth;
 516    image->dynamic_state.base.base_ptr = lp_llvm_image_base_ptr;
 517    image->dynamic_state.base.row_stride = lp_llvm_image_row_stride;
 518    image->dynamic_state.base.img_stride = lp_llvm_image_img_stride;
 519    image->dynamic_state.base.num_samples = lp_llvm_image_num_samples;
 520    image->dynamic_state.base.sample_stride = lp_llvm_image_sample_stride;
 521
 522    image->dynamic_state.static_state = static_state;
 523
 524    image->nr_images = nr_images;
 525    return &image->base;
 526 }