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
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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
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  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  * Sampler static state.
  56  *
  57  * These are the bits of state from pipe_resource and pipe_sampler_state that
  58  * are embedded in the generated code.
  59  */
  60 struct lp_sampler_static_state
  61 {
  62    /* pipe_sampler_view's state */
  63    enum pipe_format format;
  64    unsigned swizzle_r:3;     /**< PIPE_SWIZZLE_* */
  65    unsigned swizzle_g:3;
  66    unsigned swizzle_b:3;
  67    unsigned swizzle_a:3;
  68
  69    /* pipe_texture's state */
  70    unsigned target:3;        /**< PIPE_TEXTURE_* */
  71    unsigned pot_width:1;     /**< is the width a power of two? */
  72    unsigned pot_height:1;
  73    unsigned pot_depth:1;
  74
  75    /* pipe_sampler_state's state */
  76    unsigned wrap_s:3;
  77    unsigned wrap_t:3;
  78    unsigned wrap_r:3;
  79    unsigned min_img_filter:2;
  80    unsigned min_mip_filter:2;
  81    unsigned mag_img_filter:2;
  82    unsigned compare_mode:1;
  83    unsigned compare_func:3;
  84    unsigned normalized_coords:1;
  85    unsigned min_max_lod_equal:1;  /**< min_lod == max_lod ? */
  86    unsigned lod_bias_non_zero:1;
  87    unsigned apply_min_lod:1;  /**< min_lod > 0 ? */
  88    unsigned apply_max_lod:1;  /**< max_lod < last_level ? */
  89 };
  90
  91
  92 /**
  93  * Sampler dynamic state.
  94  *
  95  * These are the bits of state from pipe_resource and pipe_sampler_state that
  96  * are computed in runtime.
  97  *
  98  * There are obtained through callbacks, as we don't want to tie the texture
  99  * sampling code generation logic to any particular texture layout or pipe
 100  * driver.
 101  */
 102 struct lp_sampler_dynamic_state
 103 {
 104
 105    /** Obtain the base texture width (returns int32) */
 106    LLVMValueRef
 107    (*width)( const struct lp_sampler_dynamic_state *state,
 108              LLVMBuilderRef builder,
 109              unsigned unit);
 110
 111    /** Obtain the base texture height (returns int32) */
 112    LLVMValueRef
 113    (*height)( const struct lp_sampler_dynamic_state *state,
 114               LLVMBuilderRef builder,
 115               unsigned unit);
 116
 117    /** Obtain the base texture depth (returns int32) */
 118    LLVMValueRef
 119    (*depth)( const struct lp_sampler_dynamic_state *state,
 120              LLVMBuilderRef builder,
 121              unsigned unit);
 122
 123    /** Obtain the number of mipmap levels minus one (returns int32) */
 124    LLVMValueRef
 125    (*last_level)( const struct lp_sampler_dynamic_state *state,
 126                   LLVMBuilderRef builder,
 127                   unsigned unit);
 128
 129    /** Obtain stride in bytes between image rows/blocks (returns int32) */
 130    LLVMValueRef
 131    (*row_stride)( const struct lp_sampler_dynamic_state *state,
 132                   LLVMBuilderRef builder,
 133                   unsigned unit);
 134
 135    /** Obtain stride in bytes between image slices (returns int32) */
 136    LLVMValueRef
 137    (*img_stride)( const struct lp_sampler_dynamic_state *state,
 138                   LLVMBuilderRef builder,
 139                   unsigned unit);
 140
 141    /** Obtain pointer to array of pointers to mimpap levels */
 142    LLVMValueRef
 143    (*data_ptr)( const struct lp_sampler_dynamic_state *state,
 144                 LLVMBuilderRef builder,
 145                 unsigned unit);
 146
 147    /** Obtain texture min lod (returns float) */
 148    LLVMValueRef
 149    (*min_lod)(const struct lp_sampler_dynamic_state *state,
 150               LLVMBuilderRef builder, unsigned unit);
 151
 152    /** Obtain texture max lod (returns float) */
 153    LLVMValueRef
 154    (*max_lod)(const struct lp_sampler_dynamic_state *state,
 155               LLVMBuilderRef builder, unsigned unit);
 156
 157    /** Obtain texture lod bias (returns float) */
 158    LLVMValueRef
 159    (*lod_bias)(const struct lp_sampler_dynamic_state *state,
 160                LLVMBuilderRef builder, unsigned unit);
 161
 162    /** Obtain texture border color (returns ptr to float[4]) */
 163    LLVMValueRef
 164    (*border_color)(const struct lp_sampler_dynamic_state *state,
 165                    LLVMBuilderRef builder, unsigned unit);
 166 };
 167
 168
 169 /**
 170  * Keep all information for sampling code generation in a single place.
 171  */
 172 struct lp_build_sample_context
 173 {
 174    LLVMBuilderRef builder;
 175
 176    const struct lp_sampler_static_state *static_state;
 177
 178    struct lp_sampler_dynamic_state *dynamic_state;
 179
 180    const struct util_format_description *format_desc;
 181
 182    /* See texture_dims() */
 183    unsigned dims;
 184
 185    /** regular scalar float type */
 186    struct lp_type float_type;
 187    struct lp_build_context float_bld;
 188
 189    /** float vector type */
 190    struct lp_build_context float_vec_bld;
 191
 192    /** regular scalar float type */
 193    struct lp_type int_type;
 194    struct lp_build_context int_bld;
 195
 196    /** Incoming coordinates type and build context */
 197    struct lp_type coord_type;
 198    struct lp_build_context coord_bld;
 199
 200    /** Unsigned integer coordinates */
 201    struct lp_type uint_coord_type;
 202    struct lp_build_context uint_coord_bld;
 203
 204    /** Signed integer coordinates */
 205    struct lp_type int_coord_type;
 206    struct lp_build_context int_coord_bld;
 207
 208    /** Unsigned integer texture size */
 209    struct lp_type int_size_type;
 210    struct lp_build_context int_size_bld;
 211
 212    /** Unsigned integer texture size */
 213    struct lp_type float_size_type;
 214    struct lp_build_context float_size_bld;
 215
 216    /** Output texels type and build context */
 217    struct lp_type texel_type;
 218    struct lp_build_context texel_bld;
 219
 220    /* Common dynamic state values */
 221    LLVMValueRef width;
 222    LLVMValueRef height;
 223    LLVMValueRef depth;
 224    LLVMValueRef row_stride_array;
 225    LLVMValueRef img_stride_array;
 226    LLVMValueRef data_array;
 227
 228    /** Integer vector with texture width, height, depth */
 229    LLVMValueRef int_size;
 230 };
 231
 232
 233
 234 /**
 235  * We only support a few wrap modes in lp_build_sample_wrap_linear_int() at
 236  * this time.  Return whether the given mode is supported by that function.
 237  */
 238 static INLINE boolean
 239 lp_is_simple_wrap_mode(unsigned mode)
 240 {
 241    switch (mode) {
 242    case PIPE_TEX_WRAP_REPEAT:
 243    case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
 244       return TRUE;
 245    default:
 246       return FALSE;
 247    }
 248 }
 249
 250
 251 static INLINE void
 252 apply_sampler_swizzle(struct lp_build_sample_context *bld,
 253                       LLVMValueRef *texel)
 254 {
 255    unsigned char swizzles[4];
 256
 257    swizzles[0] = bld->static_state->swizzle_r;
 258    swizzles[1] = bld->static_state->swizzle_g;
 259    swizzles[2] = bld->static_state->swizzle_b;
 260    swizzles[3] = bld->static_state->swizzle_a;
 261
 262    lp_build_swizzle_soa_inplace(&bld->texel_bld, texel, swizzles);
 263 }
 264
 265
 266 static INLINE unsigned
 267 texture_dims(enum pipe_texture_target tex)
 268 {
 269    switch (tex) {
 270    case PIPE_TEXTURE_1D:
 271       return 1;
 272    case PIPE_TEXTURE_2D:
 273    case PIPE_TEXTURE_RECT:
 274    case PIPE_TEXTURE_CUBE:
 275       return 2;
 276    case PIPE_TEXTURE_3D:
 277       return 3;
 278    default:
 279       assert(0 && "bad texture target in texture_dims()");
 280       return 2;
 281    }
 282 }
 283
 284
 285 boolean
 286 lp_sampler_wrap_mode_uses_border_color(unsigned mode,
 287                                        unsigned min_img_filter,
 288                                        unsigned mag_img_filter);
 289
 290 /**
 291  * Derive the sampler static state.
 292  */
 293 void
 294 lp_sampler_static_state(struct lp_sampler_static_state *state,
 295                         const struct pipe_sampler_view *view,
 296                         const struct pipe_sampler_state *sampler);
 297
 298
 299 void
 300 lp_build_lod_selector(struct lp_build_sample_context *bld,
 301                       unsigned unit,
 302                       const LLVMValueRef ddx[4],
 303                       const LLVMValueRef ddy[4],
 304                       LLVMValueRef lod_bias, /* optional */
 305                       LLVMValueRef explicit_lod, /* optional */
 306                       unsigned mip_filter,
 307                       LLVMValueRef *out_lod_ipart,
 308                       LLVMValueRef *out_lod_fpart);
 309
 310 void
 311 lp_build_nearest_mip_level(struct lp_build_sample_context *bld,
 312                            unsigned unit,
 313                            LLVMValueRef lod,
 314                            LLVMValueRef *level_out);
 315
 316 void
 317 lp_build_linear_mip_levels(struct lp_build_sample_context *bld,
 318                            unsigned unit,
 319                            LLVMValueRef lod_ipart,
 320                            LLVMValueRef *lod_fpart_inout,
 321                            LLVMValueRef *level0_out,
 322                            LLVMValueRef *level1_out);
 323
 324 LLVMValueRef
 325 lp_build_get_mipmap_level(struct lp_build_sample_context *bld,
 326                           LLVMValueRef level);
 327
 328 LLVMValueRef
 329 lp_build_get_const_mipmap_level(struct lp_build_sample_context *bld,
 330                                 int level);
 331
 332
 333 void
 334 lp_build_mipmap_level_sizes(struct lp_build_sample_context *bld,
 335                             LLVMValueRef ilevel,
 336                             LLVMValueRef *out_width_vec,
 337                             LLVMValueRef *out_height_vec,
 338                             LLVMValueRef *out_depth_vec,
 339                             LLVMValueRef *row_stride_vec,
 340                             LLVMValueRef *img_stride_vec);
 341
 342
 343 void
 344 lp_build_cube_lookup(struct lp_build_sample_context *bld,
 345                      LLVMValueRef s,
 346                      LLVMValueRef t,
 347                      LLVMValueRef r,
 348                      LLVMValueRef *face,
 349                      LLVMValueRef *face_s,
 350                      LLVMValueRef *face_t);
 351
 352
 353 void
 354 lp_build_sample_partial_offset(struct lp_build_context *bld,
 355                                unsigned block_length,
 356                                LLVMValueRef coord,
 357                                LLVMValueRef stride,
 358                                LLVMValueRef *out_offset,
 359                                LLVMValueRef *out_i);
 360
 361
 362 void
 363 lp_build_sample_offset(struct lp_build_context *bld,
 364                        const struct util_format_description *format_desc,
 365                        LLVMValueRef x,
 366                        LLVMValueRef y,
 367                        LLVMValueRef z,
 368                        LLVMValueRef y_stride,
 369                        LLVMValueRef z_stride,
 370                        LLVMValueRef *out_offset,
 371                        LLVMValueRef *out_i,
 372                        LLVMValueRef *out_j);
 373
 374
 375 void
 376 lp_build_sample_soa(LLVMBuilderRef builder,
 377                     const struct lp_sampler_static_state *static_state,
 378                     struct lp_sampler_dynamic_state *dynamic_state,
 379                     struct lp_type fp_type,
 380                     unsigned unit,
 381                     unsigned num_coords,
 382                     const LLVMValueRef *coords,
 383                     const LLVMValueRef *ddx,
 384                     const LLVMValueRef *ddy,
 385                     LLVMValueRef lod_bias,
 386                     LLVMValueRef explicit_lod,
 387                     LLVMValueRef texel_out[4]);
 388
 389 void
 390 lp_build_sample_nop(struct lp_type type,
 391                     LLVMValueRef texel_out[4]);
 392
 393
 394 #endif /* LP_BLD_SAMPLE_H */