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