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
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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
  41 #include "gallivm/lp_bld.h"
  42
  43 struct pipe_resource;
  44 struct pipe_sampler_view;
  45 struct pipe_sampler_state;
  46 struct util_format_description;
  47 struct lp_type;
  48 struct lp_build_context;
  49
  50
  51 /**
  52  * Sampler static state.
  53  *
  54  * These are the bits of state from pipe_resource and pipe_sampler_state that
  55  * are embedded in the generated code.
  56  */
  57 struct lp_sampler_static_state
  58 {
  59    /* pipe_sampler_view's state */
  60    enum pipe_format format;
  61    unsigned swizzle_r:3;     /**< PIPE_SWIZZLE_* */
  62    unsigned swizzle_g:3;
  63    unsigned swizzle_b:3;
  64    unsigned swizzle_a:3;
  65
  66    /* pipe_texture's state */
  67    unsigned target:3;        /**< PIPE_TEXTURE_* */
  68    unsigned pot_width:1;     /**< is the width a power of two? */
  69    unsigned pot_height:1;
  70    unsigned pot_depth:1;
  71
  72    /* pipe_sampler_state's state */
  73    unsigned wrap_s:3;
  74    unsigned wrap_t:3;
  75    unsigned wrap_r:3;
  76    unsigned min_img_filter:2;
  77    unsigned min_mip_filter:2;
  78    unsigned mag_img_filter:2;
  79    unsigned compare_mode:1;
  80    unsigned compare_func:3;
  81    unsigned normalized_coords:1;
  82    float lod_bias, min_lod, max_lod;
  83    float border_color[4];
  84 };
  85
  86
  87 /**
  88  * Sampler dynamic state.
  89  *
  90  * These are the bits of state from pipe_resource and pipe_sampler_state that
  91  * are computed in runtime.
  92  *
  93  * There are obtained through callbacks, as we don't want to tie the texture
  94  * sampling code generation logic to any particular texture layout or pipe
  95  * driver.
  96  */
  97 struct lp_sampler_dynamic_state
  98 {
  99
 100    /** Obtain the base texture width. */
 101    LLVMValueRef
 102    (*width)( const struct lp_sampler_dynamic_state *state,
 103              LLVMBuilderRef builder,
 104              unsigned unit);
 105
 106    /** Obtain the base texture height. */
 107    LLVMValueRef
 108    (*height)( const struct lp_sampler_dynamic_state *state,
 109               LLVMBuilderRef builder,
 110               unsigned unit);
 111
 112    /** Obtain the base texture depth. */
 113    LLVMValueRef
 114    (*depth)( const struct lp_sampler_dynamic_state *state,
 115              LLVMBuilderRef builder,
 116              unsigned unit);
 117
 118    /** Obtain the number of mipmap levels (minus one). */
 119    LLVMValueRef
 120    (*last_level)( const struct lp_sampler_dynamic_state *state,
 121                   LLVMBuilderRef builder,
 122                   unsigned unit);
 123
 124    LLVMValueRef
 125    (*row_stride)( const struct lp_sampler_dynamic_state *state,
 126                   LLVMBuilderRef builder,
 127                   unsigned unit);
 128
 129    LLVMValueRef
 130    (*img_stride)( const struct lp_sampler_dynamic_state *state,
 131                   LLVMBuilderRef builder,
 132                   unsigned unit);
 133
 134    LLVMValueRef
 135    (*data_ptr)( const struct lp_sampler_dynamic_state *state,
 136                 LLVMBuilderRef builder,
 137                 unsigned unit);
 138
 139 };
 140
 141
 142 /**
 143  * Derive the sampler static state.
 144  */
 145 void
 146 lp_sampler_static_state(struct lp_sampler_static_state *state,
 147                         const struct pipe_sampler_view *view,
 148                         const struct pipe_sampler_state *sampler);
 149
 150
 151 void
 152 lp_build_sample_offset(struct lp_build_context *bld,
 153                        const struct util_format_description *format_desc,
 154                        LLVMValueRef x,
 155                        LLVMValueRef y,
 156                        LLVMValueRef z,
 157                        LLVMValueRef y_stride,
 158                        LLVMValueRef z_stride,
 159                        LLVMValueRef *out_offset,
 160                        LLVMValueRef *out_i,
 161                        LLVMValueRef *out_j);
 162
 163
 164 void
 165 lp_build_sample_soa(LLVMBuilderRef builder,
 166                     const struct lp_sampler_static_state *static_state,
 167                     struct lp_sampler_dynamic_state *dynamic_state,
 168                     struct lp_type fp_type,
 169                     unsigned unit,
 170                     unsigned num_coords,
 171                     const LLVMValueRef *coords,
 172                     const LLVMValueRef *ddx,
 173                     const LLVMValueRef *ddy,
 174                     LLVMValueRef lod_bias,
 175                     LLVMValueRef explicit_lod,
 176                     LLVMValueRef texel_out[4]);
 177
 178
 179
 180 #endif /* LP_BLD_SAMPLE_H */