src/gallium/drivers/llvmpipe/lp_rast.h

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   3  * Copyright 2009 VMware, Inc.
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  27
  28 /**
  29  * The rast code is concerned with rasterization of command bins.
  30  * Each screen tile has a bin associated with it.  To render the
  31  * scene we iterate over the tile bins and execute the commands
  32  * in each bin.
  33  * We'll do that with multiple threads...
  34  */
  35
  36
  37 #ifndef LP_RAST_H
  38 #define LP_RAST_H
  39
  40 #include "pipe/p_compiler.h"
  41 #include "lp_jit.h"
  42
  43
  44 /* Initially create and program a single rasterizer directly.  Later
  45  * will want multiple of these, one or two per core.  At that stage
  46  * will probably pass command buffers into the rasterizers rather than
  47  * individual function calls like this.
  48  */
  49 struct lp_rasterizer;
  50 struct lp_bins;
  51 struct cmd_bin;
  52 struct pipe_screen;
  53
  54 #define FIXED_ORDER 4
  55 #define FIXED_ONE (1<<FIXED_ORDER)
  56
  57
  58 /**
  59  * Rasterization state.
  60  * Objects of this type are put into the shared data bin and pointed
  61  * to by commands in the per-tile bins.
  62  */
  63 struct lp_rast_state {
  64    /* State for the shader:
  65     */
  66    struct lp_jit_context jit_context;
  67
  68    /* The shader itself.  Probably we also need to pass a pointer to
  69     * the tile color/z/stencil data somehow:
  70     */
  71    lp_jit_frag_func jit_function;
  72 };
  73
  74
  75 /**
  76  * Coefficients necessary to run the shader at a given location.
  77  * First coefficient is position.
  78  * These pointers point into the bin data buffer.
  79  */
  80 struct lp_rast_shader_inputs {
  81    float (*a0)[4];
  82    float (*dadx)[4];
  83    float (*dady)[4];
  84 };
  85
  86
  87 /**
  88  * Rasterization information for a triangle known to be in this bin,
  89  * plus inputs to run the shader:
  90  * These fields are tile- and bin-independent.
  91  * Objects of this type are put into the setup_context::data buffer.
  92  */
  93 struct lp_rast_triangle {
  94    /* bounding box of tri (in pixels) */
  95    int minx;
  96    int maxx;
  97    int miny;
  98    int maxy;
  99
 100    /* one-pixel sized trivial accept offsets for each plane */
 101    int ei1;
 102    int ei2;
 103    int ei3;
 104
 105    /* one-pixel sized trivial reject offsets for each plane */
 106    int eo1;
 107    int eo2;
 108    int eo3;
 109
 110    /* y deltas for vertex pairs (in fixed pt) */
 111    int dy12;
 112    int dy23;
 113    int dy31;
 114
 115    /* x deltas for vertex pairs (in fixed pt) */
 116    int dx12;
 117    int dx23;
 118    int dx31;
 119
 120    /* edge function values at minx,miny ?? */
 121    int c1;
 122    int c2;
 123    int c3;
 124
 125    int step[3][16];
 126
 127    /* inputs for the shader */
 128    struct lp_rast_shader_inputs inputs;
 129 };
 130
 131
 132
 133 struct lp_rasterizer *lp_rast_create( struct pipe_screen *screen );
 134
 135 void lp_rast_destroy( struct lp_rasterizer * );
 136
 137 void lp_rasterize_bins( struct lp_rasterizer *rast,
 138                         struct lp_bins *bins,
 139                         const struct pipe_framebuffer_state *fb,
 140                         bool write_depth );
 141
 142
 143
 144 union lp_rast_cmd_arg {
 145    const struct lp_rast_shader_inputs *shade_tile;
 146    const struct lp_rast_triangle *triangle;
 147    const struct lp_rast_state *set_state;
 148    uint8_t clear_color[4];
 149    unsigned clear_zstencil;
 150 };
 151
 152
 153 /* Cast wrappers.  Hopefully these compile to noops!
 154  */
 155 static INLINE const union lp_rast_cmd_arg
 156 lp_rast_arg_inputs( const struct lp_rast_shader_inputs *shade_tile )
 157 {
 158    union lp_rast_cmd_arg arg;
 159    arg.shade_tile = shade_tile;
 160    return arg;
 161 }
 162
 163 static INLINE const union lp_rast_cmd_arg
 164 lp_rast_arg_triangle( const struct lp_rast_triangle *triangle )
 165 {
 166    union lp_rast_cmd_arg arg;
 167    arg.triangle = triangle;
 168    return arg;
 169 }
 170
 171 static INLINE const union lp_rast_cmd_arg
 172 lp_rast_arg_state( const struct lp_rast_state *state )
 173 {
 174    union lp_rast_cmd_arg arg;
 175    arg.set_state = state;
 176    return arg;
 177 }
 178
 179 static INLINE const union lp_rast_cmd_arg
 180 lp_rast_arg_null( void )
 181 {
 182    union lp_rast_cmd_arg arg;
 183    arg.set_state = NULL;
 184    return arg;
 185 }
 186
 187
 188
 189 /**
 190  * Binnable Commands.
 191  * These get put into bins by the setup code and are called when
 192  * the bins are executed.
 193  */
 194
 195 void lp_rast_clear_color( struct lp_rasterizer *,
 196                           unsigned thread_index,
 197                           const union lp_rast_cmd_arg );
 198
 199 void lp_rast_clear_zstencil( struct lp_rasterizer *,
 200                              unsigned thread_index,
 201                              const union lp_rast_cmd_arg );
 202
 203 void lp_rast_load_color( struct lp_rasterizer *,
 204                          unsigned thread_index,
 205                          const union lp_rast_cmd_arg );
 206
 207 void lp_rast_load_zstencil( struct lp_rasterizer *,
 208                             unsigned thread_index,
 209                             const union lp_rast_cmd_arg );
 210
 211 void lp_rast_set_state( struct lp_rasterizer *,
 212                         unsigned thread_index,
 213                         const union lp_rast_cmd_arg );
 214
 215 void lp_rast_triangle( struct lp_rasterizer *,
 216                        unsigned thread_index,
 217                        const union lp_rast_cmd_arg );
 218
 219 void lp_rast_shade_tile( struct lp_rasterizer *,
 220                          unsigned thread_index,
 221                          const union lp_rast_cmd_arg );
 222
 223
 224 #endif