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 <llvm-c/Core.h>
  40
  41 struct pipe_texture;
  42 struct pipe_sampler_state;
  43 struct util_format_description;
  44 struct lp_type;
  45 struct lp_build_context;
  46
  47
  48 /**
  49  * Sampler static state.
  50  *
  51  * These are the bits of state from pipe_texture and pipe_sampler_state that
  52  * are embedded in the generated code.
  53  */
  54 struct lp_sampler_static_state
  55 {
  56    /* pipe_texture's state */
  57    enum pipe_format format;
  58    unsigned target:2;
  59    unsigned pot_width:1;
  60    unsigned pot_height:1;
  61    unsigned pot_depth:1;
  62
  63    /* pipe_sampler_state's state */
  64    unsigned wrap_s:3;
  65    unsigned wrap_t:3;
  66    unsigned wrap_r:3;
  67    unsigned min_img_filter:2;
  68    unsigned min_mip_filter:2;
  69    unsigned mag_img_filter:2;
  70    unsigned compare_mode:1;
  71    unsigned compare_func:3;
  72    unsigned normalized_coords:1;
  73    unsigned prefilter:4;
  74 };
  75
  76
  77 /**
  78  * Sampler dynamic state.
  79  *
  80  * These are the bits of state from pipe_texture and pipe_sampler_state that
  81  * are computed in runtime.
  82  *
  83  * There are obtained through callbacks, as we don't want to tie the texture
  84  * sampling code generation logic to any particular texture layout or pipe
  85  * driver.
  86  */
  87 struct lp_sampler_dynamic_state
  88 {
  89
  90    /** Obtain the base texture width. */
  91    LLVMValueRef
  92    (*width)( struct lp_sampler_dynamic_state *state,
  93              LLVMBuilderRef builder,
  94              unsigned unit);
  95
  96    /** Obtain the base texture height. */
  97    LLVMValueRef
  98    (*height)( struct lp_sampler_dynamic_state *state,
  99               LLVMBuilderRef builder,
 100               unsigned unit);
 101
 102    LLVMValueRef
 103    (*stride)( struct lp_sampler_dynamic_state *state,
 104               LLVMBuilderRef builder,
 105               unsigned unit);
 106
 107    LLVMValueRef
 108    (*data_ptr)( struct lp_sampler_dynamic_state *state,
 109                 LLVMBuilderRef builder,
 110                 unsigned unit);
 111
 112 };
 113
 114
 115 /**
 116  * Derive the sampler static state.
 117  */
 118 void
 119 lp_sampler_static_state(struct lp_sampler_static_state *state,
 120                         const struct pipe_texture *texture,
 121                         const struct pipe_sampler_state *sampler);
 122
 123
 124 LLVMValueRef
 125 lp_build_gather(LLVMBuilderRef builder,
 126                 unsigned length,
 127                 unsigned src_width,
 128                 unsigned dst_width,
 129                 LLVMValueRef base_ptr,
 130                 LLVMValueRef offsets);
 131
 132
 133 LLVMValueRef
 134 lp_build_sample_offset(struct lp_build_context *bld,
 135                        const struct util_format_description *format_desc,
 136                        LLVMValueRef x,
 137                        LLVMValueRef y,
 138                        LLVMValueRef y_stride,
 139                        LLVMValueRef data_ptr);
 140
 141
 142 void
 143 lp_build_sample_soa(LLVMBuilderRef builder,
 144                     const struct lp_sampler_static_state *static_state,
 145                     struct lp_sampler_dynamic_state *dynamic_state,
 146                     struct lp_type fp_type,
 147                     unsigned unit,
 148                     unsigned num_coords,
 149                     const LLVMValueRef *coords,
 150                     LLVMValueRef lodbias,
 151                     LLVMValueRef *texel);
 152
 153
 154
 155 #endif /* LP_BLD_SAMPLE_H */