src/gallium/drivers/llvmpipe/lp_rast.h

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