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