src/gallium/drivers/llvmpipe/lp_rast.h

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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 lp_bins_queue;
  52 struct cmd_bin;
  53 struct pipe_screen;
  54
  55 #define FIXED_ORDER 4
  56 #define FIXED_ONE (1<<FIXED_ORDER)
  57
  58
  59 /**
  60  * Rasterization state.
  61  * Objects of this type are put into the shared data bin and pointed
  62  * to by commands in the per-tile bins.
  63  */
  64 struct lp_rast_state {
  65    /* State for the shader:
  66     */
  67    struct lp_jit_context jit_context;
  68
  69    /* The shader itself.  Probably we also need to pass a pointer to
  70     * the tile color/z/stencil data somehow:
  71     */
  72    lp_jit_frag_func jit_function;
  73 };
  74
  75
  76 /**
  77  * Coefficients necessary to run the shader at a given location.
  78  * First coefficient is position.
  79  * These pointers point into the bin data buffer.
  80  */
  81 struct lp_rast_shader_inputs {
  82    float (*a0)[4];
  83    float (*dadx)[4];
  84    float (*dady)[4];
  85 };
  86
  87
  88 /**
  89  * Rasterization information for a triangle known to be in this bin,
  90  * plus inputs to run the shader:
  91  * These fields are tile- and bin-independent.
  92  * Objects of this type are put into the setup_context::data buffer.
  93  */
  94 struct lp_rast_triangle {
  95    /* bounding box of tri (in pixels) */
  96    int minx;
  97    int maxx;
  98    int miny;
  99    int maxy;
 100
 101    /* one-pixel sized trivial accept offsets for each plane */
 102    int ei1;
 103    int ei2;
 104    int ei3;
 105
 106    /* one-pixel sized trivial reject offsets for each plane */
 107    int eo1;
 108    int eo2;
 109    int eo3;
 110
 111    /* y deltas for vertex pairs (in fixed pt) */
 112    int dy12;
 113    int dy23;
 114    int dy31;
 115
 116    /* x deltas for vertex pairs (in fixed pt) */
 117    int dx12;
 118    int dx23;
 119    int dx31;
 120
 121    /* edge function values at minx,miny ?? */
 122    int c1;
 123    int c2;
 124    int c3;
 125
 126    int step[3][16];
 127
 128    /* inputs for the shader */
 129    struct lp_rast_shader_inputs inputs;
 130 };
 131
 132
 133
 134 struct lp_rasterizer *lp_rast_create( struct pipe_screen *screen,
 135                                       struct lp_bins_queue *empty );
 136
 137 void lp_rast_destroy( struct lp_rasterizer * );
 138
 139 void lp_rasterize_bins( struct lp_rasterizer *rast,
 140                         struct lp_bins *bins,
 141                         const struct pipe_framebuffer_state *fb,
 142                         bool write_depth );
 143
 144
 145
 146 union lp_rast_cmd_arg {
 147    const struct lp_rast_shader_inputs *shade_tile;
 148    const struct lp_rast_triangle *triangle;
 149    const struct lp_rast_state *set_state;
 150    uint8_t clear_color[4];
 151    unsigned clear_zstencil;
 152 };
 153
 154
 155 /* Cast wrappers.  Hopefully these compile to noops!
 156  */
 157 static INLINE const union lp_rast_cmd_arg
 158 lp_rast_arg_inputs( const struct lp_rast_shader_inputs *shade_tile )
 159 {
 160    union lp_rast_cmd_arg arg;
 161    arg.shade_tile = shade_tile;
 162    return arg;
 163 }
 164
 165 static INLINE const union lp_rast_cmd_arg
 166 lp_rast_arg_triangle( const struct lp_rast_triangle *triangle )
 167 {
 168    union lp_rast_cmd_arg arg;
 169    arg.triangle = triangle;
 170    return arg;
 171 }
 172
 173 static INLINE const union lp_rast_cmd_arg
 174 lp_rast_arg_state( const struct lp_rast_state *state )
 175 {
 176    union lp_rast_cmd_arg arg;
 177    arg.set_state = state;
 178    return arg;
 179 }
 180
 181 static INLINE const union lp_rast_cmd_arg
 182 lp_rast_arg_null( void )
 183 {
 184    union lp_rast_cmd_arg arg;
 185    arg.set_state = NULL;
 186    return arg;
 187 }
 188
 189
 190
 191 /**
 192  * Binnable Commands.
 193  * These get put into bins by the setup code and are called when
 194  * the bins are executed.
 195  */
 196
 197 void lp_rast_clear_color( struct lp_rasterizer *,
 198                           unsigned thread_index,
 199                           const union lp_rast_cmd_arg );
 200
 201 void lp_rast_clear_zstencil( struct lp_rasterizer *,
 202                              unsigned thread_index,
 203                              const union lp_rast_cmd_arg );
 204
 205 void lp_rast_load_color( struct lp_rasterizer *,
 206                          unsigned thread_index,
 207                          const union lp_rast_cmd_arg );
 208
 209 void lp_rast_load_zstencil( struct lp_rasterizer *,
 210                             unsigned thread_index,
 211                             const union lp_rast_cmd_arg );
 212
 213 void lp_rast_set_state( struct lp_rasterizer *,
 214                         unsigned thread_index,
 215                         const union lp_rast_cmd_arg );
 216
 217 void lp_rast_triangle( struct lp_rasterizer *,
 218                        unsigned thread_index,
 219                        const union lp_rast_cmd_arg );
 220
 221 void lp_rast_shade_tile( struct lp_rasterizer *,
 222                          unsigned thread_index,
 223                          const union lp_rast_cmd_arg );
 224
 225
 226 #endif