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_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      */
  71    struct lp_fragment_shader_variant *variant;
  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 facing;     /** Positive for front-facing, negative for back-facing */
  82
  83    float (*a0)[4];
  84    float (*dadx)[4];
  85    float (*dady)[4];
  86
  87    /* edge/step info for 3 edges and 4x4 block of pixels */
  88    PIPE_ALIGN_VAR(16) int step[3][16];
  89 };
  90
  91
  92 /**
  93  * Rasterization information for a triangle known to be in this bin,
  94  * plus inputs to run the shader:
  95  * These fields are tile- and bin-independent.
  96  * Objects of this type are put into the lp_setup_context::data buffer.
  97  */
  98 struct lp_rast_triangle {
  99 #ifdef DEBUG
 100    float v[3][2];
 101 #endif
 102
 103    /* one-pixel sized trivial accept offsets for each plane */
 104    int ei1;
 105    int ei2;
 106    int ei3;
 107
 108    /* one-pixel sized trivial reject offsets for each plane */
 109    int eo1;
 110    int eo2;
 111    int eo3;
 112
 113    /* y deltas for vertex pairs (in fixed pt) */
 114    int dy12;
 115    int dy23;
 116    int dy31;
 117
 118    /* x deltas for vertex pairs (in fixed pt) */
 119    int dx12;
 120    int dx23;
 121    int dx31;
 122
 123    /* edge function values at minx,miny ?? */
 124    int c1, c2, c3;
 125
 126    /* inputs for the shader */
 127    PIPE_ALIGN_VAR(16) struct lp_rast_shader_inputs inputs;
 128 };
 129
 130
 131
 132 struct lp_rasterizer *
 133 lp_rast_create( unsigned num_threads );
 134
 135 void
 136 lp_rast_destroy( struct lp_rasterizer * );
 137
 138 unsigned
 139 lp_rast_get_num_threads( struct lp_rasterizer * );
 140
 141 void
 142 lp_rast_queue_scene( struct lp_rasterizer *rast,
 143                      struct lp_scene *scene );
 144
 145 void
 146 lp_rast_finish( struct lp_rasterizer *rast );
 147
 148
 149 union lp_rast_cmd_arg {
 150    const struct lp_rast_shader_inputs *shade_tile;
 151    const struct lp_rast_triangle *triangle;
 152    const struct lp_rast_state *set_state;
 153    uint8_t clear_color[4];
 154    unsigned clear_zstencil;
 155    struct lp_fence *fence;
 156    struct llvmpipe_query *query_obj;
 157 };
 158
 159
 160 /* Cast wrappers.  Hopefully these compile to noops!
 161  */
 162 static INLINE union lp_rast_cmd_arg
 163 lp_rast_arg_inputs( const struct lp_rast_shader_inputs *shade_tile )
 164 {
 165    union lp_rast_cmd_arg arg;
 166    arg.shade_tile = shade_tile;
 167    return arg;
 168 }
 169
 170 static INLINE union lp_rast_cmd_arg
 171 lp_rast_arg_triangle( const struct lp_rast_triangle *triangle )
 172 {
 173    union lp_rast_cmd_arg arg;
 174    arg.triangle = triangle;
 175    return arg;
 176 }
 177
 178 static INLINE union lp_rast_cmd_arg
 179 lp_rast_arg_state( const struct lp_rast_state *state )
 180 {
 181    union lp_rast_cmd_arg arg;
 182    arg.set_state = state;
 183    return arg;
 184 }
 185
 186 static INLINE union lp_rast_cmd_arg
 187 lp_rast_arg_fence( struct lp_fence *fence )
 188 {
 189    union lp_rast_cmd_arg arg;
 190    arg.fence = fence;
 191    return arg;
 192 }
 193
 194
 195 static INLINE union lp_rast_cmd_arg
 196 lp_rast_arg_null( void )
 197 {
 198    union lp_rast_cmd_arg arg;
 199    arg.set_state = NULL;
 200    return arg;
 201 }
 202
 203
 204
 205 /**
 206  * Binnable Commands.
 207  * These get put into bins by the setup code and are called when
 208  * the bins are executed.
 209  */
 210
 211 void lp_rast_clear_color( struct lp_rasterizer_task *,
 212                           const union lp_rast_cmd_arg );
 213
 214 void lp_rast_clear_zstencil( struct lp_rasterizer_task *,
 215                              const union lp_rast_cmd_arg );
 216
 217 void lp_rast_set_state( struct lp_rasterizer_task *,
 218                         const union lp_rast_cmd_arg );
 219
 220 void lp_rast_triangle( struct lp_rasterizer_task *,
 221                        const union lp_rast_cmd_arg );
 222
 223 void lp_rast_shade_tile( struct lp_rasterizer_task *,
 224                          const union lp_rast_cmd_arg );
 225
 226 void lp_rast_fence( struct lp_rasterizer_task *,
 227                     const union lp_rast_cmd_arg );
 228
 229 void lp_rast_store_color( struct lp_rasterizer_task *,
 230                           const union lp_rast_cmd_arg );
 231
 232
 233 void lp_rast_begin_query(struct lp_rasterizer_task *,
 234                          const union lp_rast_cmd_arg );
 235
 236 void lp_rast_end_query(struct lp_rasterizer_task *,
 237                        const union lp_rast_cmd_arg );
 238
 239
 240 #endif