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 struct lp_rasterizer;
  45 struct lp_scene;
  46 struct lp_fence;
  47 struct cmd_bin;
  48
  49 /** For sub-pixel positioning */
  50 #define FIXED_ORDER 4
  51 #define FIXED_ONE (1<<FIXED_ORDER)
  52
  53
  54 struct lp_rasterizer_task;
  55
  56
  57 /**
  58  * Rasterization state.
  59  * Objects of this type are put into the shared data bin and pointed
  60  * to by commands in the per-tile bins.
  61  */
  62 struct lp_rast_state {
  63    /* State for the shader.  This also contains state which feeds into
  64     * the fragment shader, such as blend color and alpha ref value.
  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     * jit_function[0] skips the triangle in/out test code
  71     * jit_function[1] does triangle in/out testing
  72      */
  73    lp_jit_frag_func jit_function[2];
  74
  75    boolean opaque;
  76 };
  77
  78
  79 /**
  80  * Coefficients necessary to run the shader at a given location.
  81  * First coefficient is position.
  82  * These pointers point into the bin data buffer.
  83  */
  84 struct lp_rast_shader_inputs {
  85    float facing;     /** Positive for front-facing, negative for back-facing */
  86
  87    float (*a0)[4];
  88    float (*dadx)[4];
  89    float (*dady)[4];
  90
  91    /* edge/step info for 3 edges and 4x4 block of pixels */
  92    PIPE_ALIGN_VAR(16) int step[3][16];
  93 };
  94
  95
  96 /**
  97  * Rasterization information for a triangle known to be in this bin,
  98  * plus inputs to run the shader:
  99  * These fields are tile- and bin-independent.
 100  * Objects of this type are put into the lp_setup_context::data buffer.
 101  */
 102 struct lp_rast_triangle {
 103 #ifdef DEBUG
 104    float v[3][2];
 105 #endif
 106
 107    /* one-pixel sized trivial accept offsets for each plane */
 108    int ei1;
 109    int ei2;
 110    int ei3;
 111
 112    /* one-pixel sized trivial reject offsets for each plane */
 113    int eo1;
 114    int eo2;
 115    int eo3;
 116
 117    /* y deltas for vertex pairs (in fixed pt) */
 118    int dy12;
 119    int dy23;
 120    int dy31;
 121
 122    /* x deltas for vertex pairs (in fixed pt) */
 123    int dx12;
 124    int dx23;
 125    int dx31;
 126
 127    /* edge function values at minx,miny ?? */
 128    int c1, c2, c3;
 129
 130    /* inputs for the shader */
 131    PIPE_ALIGN_VAR(16) struct lp_rast_shader_inputs inputs;
 132 };
 133
 134
 135
 136 struct lp_rasterizer *
 137 lp_rast_create( void );
 138
 139 void
 140 lp_rast_destroy( struct lp_rasterizer * );
 141
 142 unsigned
 143 lp_rast_get_num_threads( struct lp_rasterizer * );
 144
 145 void
 146 lp_rast_queue_scene( struct lp_rasterizer *rast,
 147                      struct lp_scene *scene );
 148
 149 void
 150 lp_rast_finish( struct lp_rasterizer *rast );
 151
 152
 153 union lp_rast_cmd_arg {
 154    const struct lp_rast_shader_inputs *shade_tile;
 155    const struct lp_rast_triangle *triangle;
 156    const struct lp_rast_state *set_state;
 157    uint8_t clear_color[4];
 158    unsigned clear_zstencil;
 159    struct lp_fence *fence;
 160 };
 161
 162
 163 /* Cast wrappers.  Hopefully these compile to noops!
 164  */
 165 static INLINE union lp_rast_cmd_arg
 166 lp_rast_arg_inputs( const struct lp_rast_shader_inputs *shade_tile )
 167 {
 168    union lp_rast_cmd_arg arg;
 169    arg.shade_tile = shade_tile;
 170    return arg;
 171 }
 172
 173 static INLINE union lp_rast_cmd_arg
 174 lp_rast_arg_triangle( const struct lp_rast_triangle *triangle )
 175 {
 176    union lp_rast_cmd_arg arg;
 177    arg.triangle = triangle;
 178    return arg;
 179 }
 180
 181 static INLINE union lp_rast_cmd_arg
 182 lp_rast_arg_state( const struct lp_rast_state *state )
 183 {
 184    union lp_rast_cmd_arg arg;
 185    arg.set_state = state;
 186    return arg;
 187 }
 188
 189 static INLINE union lp_rast_cmd_arg
 190 lp_rast_arg_fence( struct lp_fence *fence )
 191 {
 192    union lp_rast_cmd_arg arg;
 193    arg.fence = fence;
 194    return arg;
 195 }
 196
 197
 198 static INLINE union lp_rast_cmd_arg
 199 lp_rast_arg_null( void )
 200 {
 201    union lp_rast_cmd_arg arg;
 202    arg.set_state = NULL;
 203    return arg;
 204 }
 205
 206
 207
 208 /**
 209  * Binnable Commands.
 210  * These get put into bins by the setup code and are called when
 211  * the bins are executed.
 212  */
 213
 214 void lp_rast_clear_color( struct lp_rasterizer_task *,
 215                           const union lp_rast_cmd_arg );
 216
 217 void lp_rast_clear_zstencil( struct lp_rasterizer_task *,
 218                              const union lp_rast_cmd_arg );
 219
 220 void lp_rast_load_color( struct lp_rasterizer_task *,
 221                          const union lp_rast_cmd_arg );
 222
 223 void lp_rast_set_state( struct lp_rasterizer_task *,
 224                         const union lp_rast_cmd_arg );
 225
 226 void lp_rast_triangle( struct lp_rasterizer_task *,
 227                        const union lp_rast_cmd_arg );
 228
 229 void lp_rast_shade_tile( struct lp_rasterizer_task *,
 230                          const union lp_rast_cmd_arg );
 231
 232 void lp_rast_fence( struct lp_rasterizer_task *,
 233                     const union lp_rast_cmd_arg );
 234
 235 #endif