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_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 struct lp_rasterizer_task;
  57
  58
  59 /**
  60  * Rasterization state.
  61  * Objects of this type are put into the shared data bin and pointed
  62  * to by commands in the per-tile bins.
  63  */
  64 struct lp_rast_state {
  65    /* State for the shader.  This also contains state which feeds into
  66     * the fragment shader, such as blend color and alpha ref value.
  67     */
  68    struct lp_jit_context jit_context;
  69
  70    /* The shader itself.  Probably we also need to pass a pointer to
  71     * the tile color/z/stencil data somehow:
  72     * jit_function[0] skips the triangle in/out test code
  73     * jit_function[1] does triangle in/out testing
  74      */
  75    lp_jit_frag_func jit_function[2];
  76
  77    boolean opaque;
  78 };
  79
  80
  81 /**
  82  * Coefficients necessary to run the shader at a given location.
  83  * First coefficient is position.
  84  * These pointers point into the bin data buffer.
  85  */
  86 struct lp_rast_shader_inputs {
  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 setup_context::data buffer.
 101  */
 102 struct lp_rast_triangle {
 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 *lp_rast_create( struct pipe_screen *screen,
 133                                       struct lp_scene_queue *empty );
 134
 135 void lp_rast_destroy( struct lp_rasterizer * );
 136
 137 unsigned lp_rast_get_num_threads( struct lp_rasterizer * );
 138
 139 void lp_rasterize_scene( struct lp_rasterizer *rast,
 140                          struct lp_scene *scene,
 141                          const struct pipe_framebuffer_state *fb,
 142                          bool write_depth );
 143
 144
 145
 146 union lp_rast_cmd_arg {
 147    const struct lp_rast_shader_inputs *shade_tile;
 148    const struct lp_rast_triangle *triangle;
 149    const struct lp_rast_state *set_state;
 150    uint8_t clear_color[4];
 151    unsigned clear_zstencil;
 152    struct lp_fence *fence;
 153 };
 154
 155
 156 /* Cast wrappers.  Hopefully these compile to noops!
 157  */
 158 static INLINE union lp_rast_cmd_arg
 159 lp_rast_arg_inputs( const struct lp_rast_shader_inputs *shade_tile )
 160 {
 161    union lp_rast_cmd_arg arg;
 162    arg.shade_tile = shade_tile;
 163    return arg;
 164 }
 165
 166 static INLINE union lp_rast_cmd_arg
 167 lp_rast_arg_triangle( const struct lp_rast_triangle *triangle )
 168 {
 169    union lp_rast_cmd_arg arg;
 170    arg.triangle = triangle;
 171    return arg;
 172 }
 173
 174 static INLINE union lp_rast_cmd_arg
 175 lp_rast_arg_state( const struct lp_rast_state *state )
 176 {
 177    union lp_rast_cmd_arg arg;
 178    arg.set_state = state;
 179    return arg;
 180 }
 181
 182 static INLINE union lp_rast_cmd_arg
 183 lp_rast_arg_fence( struct lp_fence *fence )
 184 {
 185    union lp_rast_cmd_arg arg;
 186    arg.fence = fence;
 187    return arg;
 188 }
 189
 190
 191 static INLINE union lp_rast_cmd_arg
 192 lp_rast_arg_null( void )
 193 {
 194    union lp_rast_cmd_arg arg;
 195    arg.set_state = NULL;
 196    return arg;
 197 }
 198
 199
 200
 201 /**
 202  * Binnable Commands.
 203  * These get put into bins by the setup code and are called when
 204  * the bins are executed.
 205  */
 206
 207 void lp_rast_clear_color( struct lp_rasterizer_task *,
 208                           const union lp_rast_cmd_arg );
 209
 210 void lp_rast_clear_zstencil( struct lp_rasterizer_task *,
 211                              const union lp_rast_cmd_arg );
 212
 213 void lp_rast_load_color( struct lp_rasterizer_task *,
 214                          const union lp_rast_cmd_arg );
 215
 216 void lp_rast_set_state( struct lp_rasterizer_task *,
 217                         const union lp_rast_cmd_arg );
 218
 219 void lp_rast_triangle( struct lp_rasterizer_task *,
 220                        const union lp_rast_cmd_arg );
 221
 222 void lp_rast_shade_tile( struct lp_rasterizer_task *,
 223                          const union lp_rast_cmd_arg );
 224
 225 void lp_rast_fence( struct lp_rasterizer_task *,
 226                     const union lp_rast_cmd_arg );
 227
 228 #endif