src/gallium/auxiliary/gallivm/lp_bld_sample.h

   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,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  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  * @file
  30  * Texture sampling.
  31  *
  32  * @author Jose Fonseca <jfonseca@vmware.com>
  33  */
  34
  35 #ifndef LP_BLD_SAMPLE_H
  36 #define LP_BLD_SAMPLE_H
  37
  38
  39 #include "pipe/p_format.h"
  40 #include "util/u_debug.h"
  41 #include "gallivm/lp_bld.h"
  42 #include "gallivm/lp_bld_type.h"
  43 #include "gallivm/lp_bld_swizzle.h"
  44
  45
  46 struct pipe_resource;
  47 struct pipe_sampler_view;
  48 struct pipe_sampler_state;
  49 struct util_format_description;
  50 struct lp_type;
  51 struct lp_build_context;
  52
  53
  54 /**
  55  * Helper struct holding all derivatives needed for sampling
  56  */
  57 struct lp_derivatives
  58 {
  59    LLVMValueRef ddx[3];
  60    LLVMValueRef ddy[3];
  61 };
  62
  63
  64 enum lp_sampler_lod_property {
  65    LP_SAMPLER_LOD_SCALAR,
  66    LP_SAMPLER_LOD_PER_ELEMENT,
  67    LP_SAMPLER_LOD_PER_QUAD
  68 };
  69
  70
  71 /**
  72  * Texture static state.
  73  *
  74  * These are the bits of state from pipe_resource/pipe_sampler_view that
  75  * are embedded in the generated code.
  76  */
  77 struct lp_static_texture_state
  78 {
  79    /* pipe_sampler_view's state */
  80    enum pipe_format format;
  81    unsigned swizzle_r:3;     /**< PIPE_SWIZZLE_* */
  82    unsigned swizzle_g:3;
  83    unsigned swizzle_b:3;
  84    unsigned swizzle_a:3;
  85
  86    /* pipe_texture's state */
  87    unsigned target:4;        /**< PIPE_TEXTURE_* */
  88    unsigned pot_width:1;     /**< is the width a power of two? */
  89    unsigned pot_height:1;
  90    unsigned pot_depth:1;
  91    unsigned level_zero_only:1;
  92 };
  93
  94
  95 /**
  96  * Sampler static state.
  97  *
  98  * These are the bits of state from pipe_sampler_state that
  99  * are embedded in the generated code.
 100  */
 101 struct lp_static_sampler_state
 102 {
 103    /* pipe_sampler_state's state */
 104    unsigned wrap_s:3;
 105    unsigned wrap_t:3;
 106    unsigned wrap_r:3;
 107    unsigned min_img_filter:2;
 108    unsigned min_mip_filter:2;
 109    unsigned mag_img_filter:2;
 110    unsigned compare_mode:1;
 111    unsigned compare_func:3;
 112    unsigned normalized_coords:1;
 113    unsigned min_max_lod_equal:1;  /**< min_lod == max_lod ? */
 114    unsigned lod_bias_non_zero:1;
 115    unsigned apply_min_lod:1;  /**< min_lod > 0 ? */
 116    unsigned apply_max_lod:1;  /**< max_lod < last_level ? */
 117
 118    /* Hacks */
 119    unsigned force_nearest_s:1;
 120    unsigned force_nearest_t:1;
 121 };
 122
 123
 124 /**
 125  * Sampler dynamic state.
 126  *
 127  * These are the bits of state from pipe_resource/pipe_sampler_view
 128  * as well as from sampler state that are computed at runtime.
 129  *
 130  * There are obtained through callbacks, as we don't want to tie the texture
 131  * sampling code generation logic to any particular texture layout or pipe
 132  * driver.
 133  */
 134 struct lp_sampler_dynamic_state
 135 {
 136    /* First callbacks for sampler view state */
 137
 138    /** Obtain the base texture width (or number of elements) (returns int32) */
 139    LLVMValueRef
 140    (*width)( const struct lp_sampler_dynamic_state *state,
 141              struct gallivm_state *gallivm,
 142              unsigned texture_unit);
 143
 144    /** Obtain the base texture height (returns int32) */
 145    LLVMValueRef
 146    (*height)( const struct lp_sampler_dynamic_state *state,
 147               struct gallivm_state *gallivm,
 148               unsigned texture_unit);
 149
 150    /** Obtain the base texture depth (or array size) (returns int32) */
 151    LLVMValueRef
 152    (*depth)( const struct lp_sampler_dynamic_state *state,
 153              struct gallivm_state *gallivm,
 154              unsigned texture_unit);
 155
 156    /** Obtain the first mipmap level (base level) (returns int32) */
 157    LLVMValueRef
 158    (*first_level)( const struct lp_sampler_dynamic_state *state,
 159                    struct gallivm_state *gallivm,
 160                    unsigned texture_unit);
 161
 162    /** Obtain the number of mipmap levels minus one (returns int32) */
 163    LLVMValueRef
 164    (*last_level)( const struct lp_sampler_dynamic_state *state,
 165                   struct gallivm_state *gallivm,
 166                   unsigned texture_unit);
 167
 168    /** Obtain stride in bytes between image rows/blocks (returns int32) */
 169    LLVMValueRef
 170    (*row_stride)( const struct lp_sampler_dynamic_state *state,
 171                   struct gallivm_state *gallivm,
 172                   unsigned texture_unit);
 173
 174    /** Obtain stride in bytes between image slices (returns int32) */
 175    LLVMValueRef
 176    (*img_stride)( const struct lp_sampler_dynamic_state *state,
 177                   struct gallivm_state *gallivm,
 178                   unsigned texture_unit);
 179
 180    /** Obtain pointer to base of texture */
 181    LLVMValueRef
 182    (*base_ptr)( const struct lp_sampler_dynamic_state *state,
 183                 struct gallivm_state *gallivm,
 184                 unsigned texture_unit);
 185
 186    /** Obtain pointer to array of mipmap offsets */
 187    LLVMValueRef
 188    (*mip_offsets)( const struct lp_sampler_dynamic_state *state,
 189                    struct gallivm_state *gallivm,
 190                    unsigned texture_unit);
 191
 192    /* These are callbacks for sampler state */
 193
 194    /** Obtain texture min lod (returns float) */
 195    LLVMValueRef
 196    (*min_lod)(const struct lp_sampler_dynamic_state *state,
 197               struct gallivm_state *gallivm, unsigned sampler_unit);
 198
 199    /** Obtain texture max lod (returns float) */
 200    LLVMValueRef
 201    (*max_lod)(const struct lp_sampler_dynamic_state *state,
 202               struct gallivm_state *gallivm, unsigned sampler_unit);
 203
 204    /** Obtain texture lod bias (returns float) */
 205    LLVMValueRef
 206    (*lod_bias)(const struct lp_sampler_dynamic_state *state,
 207                struct gallivm_state *gallivm, unsigned sampler_unit);
 208
 209    /** Obtain texture border color (returns ptr to float[4]) */
 210    LLVMValueRef
 211    (*border_color)(const struct lp_sampler_dynamic_state *state,
 212                    struct gallivm_state *gallivm, unsigned sampler_unit);
 213 };
 214
 215
 216 /**
 217  * Keep all information for sampling code generation in a single place.
 218  */
 219 struct lp_build_sample_context
 220 {
 221    struct gallivm_state *gallivm;
 222
 223    const struct lp_static_texture_state *static_texture_state;
 224    const struct lp_static_sampler_state *static_sampler_state;
 225
 226    struct lp_sampler_dynamic_state *dynamic_state;
 227
 228    const struct util_format_description *format_desc;
 229
 230    /* See texture_dims() */
 231    unsigned dims;
 232
 233    /** SIMD vector width */
 234    unsigned vector_width;
 235
 236    /** number of lod values (valid are 1, length/4, length) */
 237    unsigned num_lods;
 238
 239    /** regular scalar float type */
 240    struct lp_type float_type;
 241    struct lp_build_context float_bld;
 242
 243    /** float vector type */
 244    struct lp_build_context float_vec_bld;
 245
 246    /** regular scalar int type */
 247    struct lp_type int_type;
 248    struct lp_build_context int_bld;
 249
 250    /** Incoming coordinates type and build context */
 251    struct lp_type coord_type;
 252    struct lp_build_context coord_bld;
 253
 254    /** Signed integer coordinates */
 255    struct lp_type int_coord_type;
 256    struct lp_build_context int_coord_bld;
 257
 258    /** Unsigned integer texture size */
 259    struct lp_type int_size_in_type;
 260    struct lp_build_context int_size_in_bld;
 261
 262    /** Float incoming texture size */
 263    struct lp_type float_size_in_type;
 264    struct lp_build_context float_size_in_bld;
 265
 266    /** Unsigned integer texture size (might be per quad) */
 267    struct lp_type int_size_type;
 268    struct lp_build_context int_size_bld;
 269
 270    /** Float texture size (might be per quad) */
 271    struct lp_type float_size_type;
 272    struct lp_build_context float_size_bld;
 273
 274    /** Output texels type and build context */
 275    struct lp_type texel_type;
 276    struct lp_build_context texel_bld;
 277
 278    /** Float level type */
 279    struct lp_type levelf_type;
 280    struct lp_build_context levelf_bld;
 281
 282    /** Int level type */
 283    struct lp_type leveli_type;
 284    struct lp_build_context leveli_bld;
 285
 286    /* Common dynamic state values */
 287    LLVMValueRef row_stride_array;
 288    LLVMValueRef img_stride_array;
 289    LLVMValueRef base_ptr;
 290    LLVMValueRef mip_offsets;
 291
 292    /** Integer vector with texture width, height, depth */
 293    LLVMValueRef int_size;
 294
 295    LLVMValueRef border_color_clamped;
 296 };
 297
 298
 299
 300 /**
 301  * We only support a few wrap modes in lp_build_sample_wrap_linear_int() at
 302  * this time.  Return whether the given mode is supported by that function.
 303  */
 304 static INLINE boolean
 305 lp_is_simple_wrap_mode(unsigned mode)
 306 {
 307    switch (mode) {
 308    case PIPE_TEX_WRAP_REPEAT:
 309    case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
 310       return TRUE;
 311    default:
 312       return FALSE;
 313    }
 314 }
 315
 316
 317 static INLINE void
 318 apply_sampler_swizzle(struct lp_build_sample_context *bld,
 319                       LLVMValueRef *texel)
 320 {
 321    unsigned char swizzles[4];
 322
 323    swizzles[0] = bld->static_texture_state->swizzle_r;
 324    swizzles[1] = bld->static_texture_state->swizzle_g;
 325    swizzles[2] = bld->static_texture_state->swizzle_b;
 326    swizzles[3] = bld->static_texture_state->swizzle_a;
 327
 328    lp_build_swizzle_soa_inplace(&bld->texel_bld, texel, swizzles);
 329 }
 330
 331 /*
 332  * not really dimension as such, this indicates the amount of
 333  * "normal" texture coords subject to minification, wrapping etc.
 334  */
 335 static INLINE unsigned
 336 texture_dims(enum pipe_texture_target tex)
 337 {
 338    switch (tex) {
 339    case PIPE_TEXTURE_1D:
 340    case PIPE_TEXTURE_1D_ARRAY:
 341    case PIPE_BUFFER:
 342       return 1;
 343    case PIPE_TEXTURE_2D:
 344    case PIPE_TEXTURE_2D_ARRAY:
 345    case PIPE_TEXTURE_RECT:
 346    case PIPE_TEXTURE_CUBE:
 347       return 2;
 348    case PIPE_TEXTURE_CUBE_ARRAY:
 349       assert(0);
 350       return 2;
 351    case PIPE_TEXTURE_3D:
 352       return 3;
 353    default:
 354       assert(0 && "bad texture target in texture_dims()");
 355       return 2;
 356    }
 357 }
 358
 359
 360 boolean
 361 lp_sampler_wrap_mode_uses_border_color(unsigned mode,
 362                                        unsigned min_img_filter,
 363                                        unsigned mag_img_filter);
 364
 365 /**
 366  * Derive the sampler static state.
 367  */
 368 void
 369 lp_sampler_static_sampler_state(struct lp_static_sampler_state *state,
 370                                 const struct pipe_sampler_state *sampler);
 371
 372
 373 void
 374 lp_sampler_static_texture_state(struct lp_static_texture_state *state,
 375                                 const struct pipe_sampler_view *view);
 376
 377
 378 void
 379 lp_build_lod_selector(struct lp_build_sample_context *bld,
 380                       unsigned texture_index,
 381                       unsigned sampler_index,
 382                       LLVMValueRef s,
 383                       LLVMValueRef t,
 384                       LLVMValueRef r,
 385                       LLVMValueRef cube_rho,
 386                       const struct lp_derivatives *derivs,
 387                       LLVMValueRef lod_bias, /* optional */
 388                       LLVMValueRef explicit_lod, /* optional */
 389                       unsigned mip_filter,
 390                       LLVMValueRef *out_lod_ipart,
 391                       LLVMValueRef *out_lod_fpart,
 392                       LLVMValueRef *out_lod_positive);
 393
 394 void
 395 lp_build_nearest_mip_level(struct lp_build_sample_context *bld,
 396                            unsigned texture_unit,
 397                            LLVMValueRef lod,
 398                            LLVMValueRef *level_out,
 399                            LLVMValueRef *out_of_bounds);
 400
 401 void
 402 lp_build_linear_mip_levels(struct lp_build_sample_context *bld,
 403                            unsigned texture_unit,
 404                            LLVMValueRef lod_ipart,
 405                            LLVMValueRef *lod_fpart_inout,
 406                            LLVMValueRef *level0_out,
 407                            LLVMValueRef *level1_out);
 408
 409 LLVMValueRef
 410 lp_build_get_mipmap_level(struct lp_build_sample_context *bld,
 411                           LLVMValueRef level);
 412
 413
 414 LLVMValueRef
 415 lp_build_get_mip_offsets(struct lp_build_sample_context *bld,
 416                          LLVMValueRef level);
 417
 418
 419 void
 420 lp_build_mipmap_level_sizes(struct lp_build_sample_context *bld,
 421                             LLVMValueRef ilevel,
 422                             LLVMValueRef *out_size_vec,
 423                             LLVMValueRef *row_stride_vec,
 424                             LLVMValueRef *img_stride_vec);
 425
 426
 427 void
 428 lp_build_extract_image_sizes(struct lp_build_sample_context *bld,
 429                              struct lp_build_context *size_bld,
 430                              struct lp_type coord_type,
 431                              LLVMValueRef size,
 432                              LLVMValueRef *out_width,
 433                              LLVMValueRef *out_height,
 434                              LLVMValueRef *out_depth);
 435
 436
 437 void
 438 lp_build_unnormalized_coords(struct lp_build_sample_context *bld,
 439                              LLVMValueRef flt_size,
 440                              LLVMValueRef *s,
 441                              LLVMValueRef *t,
 442                              LLVMValueRef *r);
 443
 444
 445 void
 446 lp_build_cube_lookup(struct lp_build_sample_context *bld,
 447                      LLVMValueRef *coords,
 448                      const struct lp_derivatives *derivs, /* optional */
 449                      LLVMValueRef *rho,
 450                      boolean need_derivs);
 451
 452
 453 void
 454 lp_build_sample_partial_offset(struct lp_build_context *bld,
 455                                unsigned block_length,
 456                                LLVMValueRef coord,
 457                                LLVMValueRef stride,
 458                                LLVMValueRef *out_offset,
 459                                LLVMValueRef *out_i);
 460
 461
 462 void
 463 lp_build_sample_offset(struct lp_build_context *bld,
 464                        const struct util_format_description *format_desc,
 465                        LLVMValueRef x,
 466                        LLVMValueRef y,
 467                        LLVMValueRef z,
 468                        LLVMValueRef y_stride,
 469                        LLVMValueRef z_stride,
 470                        LLVMValueRef *out_offset,
 471                        LLVMValueRef *out_i,
 472                        LLVMValueRef *out_j);
 473
 474
 475 void
 476 lp_build_sample_soa(struct gallivm_state *gallivm,
 477                     const struct lp_static_texture_state *static_texture_state,
 478                     const struct lp_static_sampler_state *static_sampler_state,
 479                     struct lp_sampler_dynamic_state *dynamic_texture_state,
 480                     struct lp_type fp_type,
 481                     boolean is_fetch,
 482                     unsigned texture_index,
 483                     unsigned sampler_index,
 484                     const LLVMValueRef *coords,
 485                     const LLVMValueRef *offsets,
 486                     const struct lp_derivatives *derivs,
 487                     LLVMValueRef lod_bias,
 488                     LLVMValueRef explicit_lod,
 489                     enum lp_sampler_lod_property lod_property,
 490                     LLVMValueRef texel_out[4]);
 491
 492
 493 void
 494 lp_build_coord_repeat_npot_linear(struct lp_build_sample_context *bld,
 495                                   LLVMValueRef coord_f,
 496                                   LLVMValueRef length_i,
 497                                   LLVMValueRef length_f,
 498                                   LLVMValueRef *coord0_i,
 499                                   LLVMValueRef *weight_f);
 500
 501
 502 void
 503 lp_build_size_query_soa(struct gallivm_state *gallivm,
 504                         const struct lp_static_texture_state *static_state,
 505                         struct lp_sampler_dynamic_state *dynamic_state,
 506                         struct lp_type int_type,
 507                         unsigned texture_unit,
 508                         unsigned target,
 509                         boolean is_sviewinfo,
 510                         enum lp_sampler_lod_property lod_property,
 511                         LLVMValueRef explicit_lod,
 512                         LLVMValueRef *sizes_out);
 513
 514 void
 515 lp_build_sample_nop(struct gallivm_state *gallivm,
 516                     struct lp_type type,
 517                     const LLVMValueRef *coords,
 518                     LLVMValueRef texel_out[4]);
 519
 520
 521 LLVMValueRef
 522 lp_build_minify(struct lp_build_context *bld,
 523                 LLVMValueRef base_size,
 524                 LLVMValueRef level);
 525
 526
 527 #endif /* LP_BLD_SAMPLE_H */