src/gallium/auxiliary/gallivm/lp_bld_sample.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  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 "gallivm/lp_bld.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    float lod_bias, min_lod, max_lod;
  74    float border_color[4];
  75 };
  76
  77
  78 /**
  79  * Sampler dynamic state.
  80  *
  81  * These are the bits of state from pipe_texture and pipe_sampler_state that
  82  * are computed in runtime.
  83  *
  84  * There are obtained through callbacks, as we don't want to tie the texture
  85  * sampling code generation logic to any particular texture layout or pipe
  86  * driver.
  87  */
  88 struct lp_sampler_dynamic_state
  89 {
  90
  91    /** Obtain the base texture width. */
  92    LLVMValueRef
  93    (*width)( struct lp_sampler_dynamic_state *state,
  94              LLVMBuilderRef builder,
  95              unsigned unit);
  96
  97    /** Obtain the base texture height. */
  98    LLVMValueRef
  99    (*height)( struct lp_sampler_dynamic_state *state,
 100               LLVMBuilderRef builder,
 101               unsigned unit);
 102
 103    /** Obtain the base texture depth. */
 104    LLVMValueRef
 105    (*depth)( struct lp_sampler_dynamic_state *state,
 106              LLVMBuilderRef builder,
 107              unsigned unit);
 108
 109    /** Obtain the number of mipmap levels (minus one). */
 110    LLVMValueRef
 111    (*last_level)( struct lp_sampler_dynamic_state *state,
 112                   LLVMBuilderRef builder,
 113                   unsigned unit);
 114
 115    LLVMValueRef
 116    (*row_stride)( struct lp_sampler_dynamic_state *state,
 117                   LLVMBuilderRef builder,
 118                   unsigned unit);
 119
 120    LLVMValueRef
 121    (*data_ptr)( struct lp_sampler_dynamic_state *state,
 122                 LLVMBuilderRef builder,
 123                 unsigned unit);
 124
 125 };
 126
 127
 128 /**
 129  * Derive the sampler static state.
 130  */
 131 void
 132 lp_sampler_static_state(struct lp_sampler_static_state *state,
 133                         const struct pipe_texture *texture,
 134                         const struct pipe_sampler_state *sampler);
 135
 136
 137 LLVMValueRef
 138 lp_build_gather(LLVMBuilderRef builder,
 139                 unsigned length,
 140                 unsigned src_width,
 141                 unsigned dst_width,
 142                 LLVMValueRef base_ptr,
 143                 LLVMValueRef offsets);
 144
 145
 146 LLVMValueRef
 147 lp_build_sample_offset(struct lp_build_context *bld,
 148                        const struct util_format_description *format_desc,
 149                        LLVMValueRef x,
 150                        LLVMValueRef y,
 151                        LLVMValueRef z,
 152                        LLVMValueRef y_stride,
 153                        LLVMValueRef z_stride);
 154
 155
 156 void
 157 lp_build_sample_soa(LLVMBuilderRef builder,
 158                     const struct lp_sampler_static_state *static_state,
 159                     struct lp_sampler_dynamic_state *dynamic_state,
 160                     struct lp_type fp_type,
 161                     unsigned unit,
 162                     unsigned num_coords,
 163                     const LLVMValueRef *coords,
 164                     LLVMValueRef lodbias,
 165                     LLVMValueRef *texel);
 166
 167
 168
 169 #endif /* LP_BLD_SAMPLE_H */