src/gallium/drivers/llvmpipe/lp_rast.h

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   3  * Copyright 2009 VMware, Inc.
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  16  * of the Software.
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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 struct lp_rasterizer;
  45 struct lp_bins;
  46 struct lp_bins_queue;
  47 struct lp_fence;
  48 struct cmd_bin;
  49 struct pipe_screen;
  50
  51 /** For sub-pixel positioning */
  52 #define FIXED_ORDER 4
  53 #define FIXED_ONE (1<<FIXED_ORDER)
  54
  55
  56 /**
  57  * Rasterization state.
  58  * Objects of this type are put into the shared data bin and pointed
  59  * to by commands in the per-tile bins.
  60  */
  61 struct lp_rast_state {
  62    /* State for the shader.  This also contains state which feeds into
  63     * the fragment shader, such as blend color and alpha ref value.
  64     */
  65    struct lp_jit_context jit_context;
  66
  67    /* The shader itself.  Probably we also need to pass a pointer to
  68     * the tile color/z/stencil data somehow:
  69     */
  70    lp_jit_frag_func jit_function;
  71 };
  72
  73
  74 /**
  75  * Coefficients necessary to run the shader at a given location.
  76  * First coefficient is position.
  77  * These pointers point into the bin data buffer.
  78  */
  79 struct lp_rast_shader_inputs {
  80    float (*a0)[4];
  81    float (*dadx)[4];
  82    float (*dady)[4];
  83 };
  84
  85
  86 /**
  87  * Rasterization information for a triangle known to be in this bin,
  88  * plus inputs to run the shader:
  89  * These fields are tile- and bin-independent.
  90  * Objects of this type are put into the setup_context::data buffer.
  91  */
  92 struct lp_rast_triangle {
  93    /* bounding box of tri (in pixels) */
  94    int minx;
  95    int maxx;
  96    int miny;
  97    int maxy;
  98
  99    /* one-pixel sized trivial accept offsets for each plane */
 100    int ei1;
 101    int ei2;
 102    int ei3;
 103
 104    /* one-pixel sized trivial reject offsets for each plane */
 105    int eo1;
 106    int eo2;
 107    int eo3;
 108
 109    /* y deltas for vertex pairs (in fixed pt) */
 110    int dy12;
 111    int dy23;
 112    int dy31;
 113
 114    /* x deltas for vertex pairs (in fixed pt) */
 115    int dx12;
 116    int dx23;
 117    int dx31;
 118
 119    /* edge function values at minx,miny ?? */
 120    int c1;
 121    int c2;
 122    int c3;
 123
 124    int step[3][16];
 125
 126    /* inputs for the shader */
 127    struct lp_rast_shader_inputs inputs;
 128 };
 129
 130
 131
 132 struct lp_rasterizer *lp_rast_create( struct pipe_screen *screen,
 133                                       struct lp_bins_queue *empty );
 134
 135 void lp_rast_destroy( struct lp_rasterizer * );
 136
 137 unsigned lp_rast_get_num_threads( 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    struct lp_fence *fence;
 153 };
 154
 155
 156 /* Cast wrappers.  Hopefully these compile to noops!
 157  */
 158 static INLINE const union lp_rast_cmd_arg
 159 lp_rast_arg_inputs( const struct lp_rast_shader_inputs *shade_tile )
 160 {
 161    union lp_rast_cmd_arg arg;
 162    arg.shade_tile = shade_tile;
 163    return arg;
 164 }
 165
 166 static INLINE const union lp_rast_cmd_arg
 167 lp_rast_arg_triangle( const struct lp_rast_triangle *triangle )
 168 {
 169    union lp_rast_cmd_arg arg;
 170    arg.triangle = triangle;
 171    return arg;
 172 }
 173
 174 static INLINE const union lp_rast_cmd_arg
 175 lp_rast_arg_state( const struct lp_rast_state *state )
 176 {
 177    union lp_rast_cmd_arg arg;
 178    arg.set_state = state;
 179    return arg;
 180 }
 181
 182 static INLINE const union lp_rast_cmd_arg
 183 lp_rast_arg_fence( struct lp_fence *fence )
 184 {
 185    union lp_rast_cmd_arg arg;
 186    arg.fence = fence;
 187    return arg;
 188 }
 189
 190
 191 static INLINE const union lp_rast_cmd_arg
 192 lp_rast_arg_null( void )
 193 {
 194    union lp_rast_cmd_arg arg;
 195    arg.set_state = NULL;
 196    return arg;
 197 }
 198
 199
 200
 201 /**
 202  * Binnable Commands.
 203  * These get put into bins by the setup code and are called when
 204  * the bins are executed.
 205  */
 206
 207 void lp_rast_clear_color( struct lp_rasterizer *,
 208                           unsigned thread_index,
 209                           const union lp_rast_cmd_arg );
 210
 211 void lp_rast_clear_zstencil( struct lp_rasterizer *,
 212                              unsigned thread_index,
 213                              const union lp_rast_cmd_arg );
 214
 215 void lp_rast_load_color( struct lp_rasterizer *,
 216                          unsigned thread_index,
 217                          const union lp_rast_cmd_arg );
 218
 219 void lp_rast_load_zstencil( struct lp_rasterizer *,
 220                             unsigned thread_index,
 221                             const union lp_rast_cmd_arg );
 222
 223 void lp_rast_set_state( struct lp_rasterizer *,
 224                         unsigned thread_index,
 225                         const union lp_rast_cmd_arg );
 226
 227 void lp_rast_triangle( struct lp_rasterizer *,
 228                        unsigned thread_index,
 229                        const union lp_rast_cmd_arg );
 230
 231 void lp_rast_shade_tile( struct lp_rasterizer *,
 232                          unsigned thread_index,
 233                          const union lp_rast_cmd_arg );
 234
 235 void lp_rast_fence( struct lp_rasterizer *,
 236                     unsigned thread_index,
 237                     const union lp_rast_cmd_arg );
 238
 239 #endif