src/gallium/drivers/llvmpipe/lp_rast.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  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 cmd_bin;
  51 struct pipe_screen;
  52
  53 #define FIXED_ORDER 4
  54 #define FIXED_ONE (1<<FIXED_ORDER)
  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:
  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
 134 void lp_rast_destroy( struct lp_rasterizer * );
 135
 136
 137 boolean lp_rast_begin( struct lp_rasterizer *rast,
 138                        struct pipe_surface *cbuf,
 139                        struct pipe_surface *zsbuf,
 140                        boolean write_color,
 141                        boolean write_zstencil,
 142                        unsigned width,
 143                        unsigned height );
 144
 145 void
 146 lp_rasterize_bin( struct lp_rasterizer *rast,
 147                   const struct cmd_bin *bin,
 148                   int x, int y);
 149
 150
 151 void lp_rast_end( struct lp_rasterizer * );
 152
 153
 154 union lp_rast_cmd_arg {
 155    const struct lp_rast_shader_inputs *shade_tile;
 156    const struct lp_rast_triangle *triangle;
 157    const struct lp_rast_state *set_state;
 158    uint8_t clear_color[4];
 159    unsigned clear_zstencil;
 160 };
 161
 162
 163 /* Cast wrappers.  Hopefully these compile to noops!
 164  */
 165 static INLINE const 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 const 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 const 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 const union lp_rast_cmd_arg
 190 lp_rast_arg_null( void )
 191 {
 192    union lp_rast_cmd_arg arg;
 193    arg.set_state = NULL;
 194    return arg;
 195 }
 196
 197
 198
 199 /**
 200  * Binnable Commands.
 201  * These get put into bins by the setup code and are called when
 202  * the bins are executed.
 203  */
 204
 205 void lp_rast_clear_color( struct lp_rasterizer *,
 206                           const union lp_rast_cmd_arg );
 207
 208 void lp_rast_clear_zstencil( struct lp_rasterizer *,
 209                              const union lp_rast_cmd_arg );
 210
 211 void lp_rast_load_color( struct lp_rasterizer *,
 212                          const union lp_rast_cmd_arg );
 213
 214 void lp_rast_load_zstencil( struct lp_rasterizer *,
 215                             const union lp_rast_cmd_arg );
 216
 217 void lp_rast_set_state( struct lp_rasterizer *,
 218                         const union lp_rast_cmd_arg );
 219
 220 void lp_rast_triangle( struct lp_rasterizer *,
 221                        const union lp_rast_cmd_arg );
 222
 223 void lp_rast_shade_tile( struct lp_rasterizer *,
 224                          const union lp_rast_cmd_arg );
 225
 226
 227 #endif