src/gallium/drivers/svga/svga_draw_private.h

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
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   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
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  25
  26 #ifndef SVGA_DRAW_H_
  27 #define SVGA_DRAW_H_
  28
  29 #include "pipe/p_compiler.h"
  30 #include "pipe/p_defines.h"
  31 #include "indices/u_indices.h"
  32 #include "svga_hw_reg.h"
  33 #include "svga3d_shaderdefs.h"
  34
  35 struct svga_context;
  36 struct u_upload_mgr;
  37
  38 /**
  39  * Mask indicating which types of gallium primitives are actually
  40  * handled by the svga device.  Other types will be converted to
  41  * these types by the index/translation code.
  42  */
  43 static const unsigned svga_hw_prims =
  44    ((1 << PIPE_PRIM_POINTS) |
  45     (1 << PIPE_PRIM_LINES) |
  46     (1 << PIPE_PRIM_LINE_STRIP) |
  47     (1 << PIPE_PRIM_TRIANGLES) |
  48     (1 << PIPE_PRIM_TRIANGLE_STRIP) |
  49     (1 << PIPE_PRIM_TRIANGLE_FAN) |
  50     (1 << PIPE_PRIM_LINES_ADJACENCY) |
  51     (1 << PIPE_PRIM_LINE_STRIP_ADJACENCY) |
  52     (1 << PIPE_PRIM_TRIANGLES_ADJACENCY) |
  53     (1 << PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY));
  54
  55
  56 /**
  57  * Translate a gallium PIPE_PRIM_x value to an SVGA3D_PRIMITIVE_x value.
  58  * Also, compute the number of primitives that'll be drawn given a
  59  * vertex count.
  60  * Note that this function doesn't have to handle PIPE_PRIM_LINE_LOOP,
  61  * PIPE_PRIM_QUADS, PIPE_PRIM_QUAD_STRIP or PIPE_PRIM_POLYGON.  We convert
  62  * those to other types of primitives with index/translation code.
  63  */
  64 static inline SVGA3dPrimitiveType
  65 svga_translate_prim(unsigned mode, unsigned vcount, unsigned *prim_count)
  66 {
  67    switch (mode) {
  68    case PIPE_PRIM_POINTS:
  69       *prim_count = vcount;
  70       return SVGA3D_PRIMITIVE_POINTLIST;
  71
  72    case PIPE_PRIM_LINES:
  73       *prim_count = vcount / 2;
  74       return SVGA3D_PRIMITIVE_LINELIST;
  75
  76    case PIPE_PRIM_LINE_STRIP:
  77       *prim_count = vcount - 1;
  78       return SVGA3D_PRIMITIVE_LINESTRIP;
  79
  80    case PIPE_PRIM_TRIANGLES:
  81       *prim_count = vcount / 3;
  82       return SVGA3D_PRIMITIVE_TRIANGLELIST;
  83
  84    case PIPE_PRIM_TRIANGLE_STRIP:
  85       *prim_count = vcount - 2;
  86       return SVGA3D_PRIMITIVE_TRIANGLESTRIP;
  87
  88    case PIPE_PRIM_TRIANGLE_FAN:
  89       *prim_count = vcount - 2;
  90       return SVGA3D_PRIMITIVE_TRIANGLEFAN;
  91
  92    case PIPE_PRIM_LINES_ADJACENCY:
  93       *prim_count = vcount / 4;
  94       return SVGA3D_PRIMITIVE_LINELIST_ADJ;
  95
  96    case PIPE_PRIM_LINE_STRIP_ADJACENCY:
  97       *prim_count = vcount - 3;
  98       return SVGA3D_PRIMITIVE_LINESTRIP_ADJ;
  99
 100    case PIPE_PRIM_TRIANGLES_ADJACENCY:
 101       *prim_count = vcount / 6;
 102       return SVGA3D_PRIMITIVE_TRIANGLELIST_ADJ;
 103
 104    case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
 105       *prim_count = vcount / 2 - 2 ;
 106       return SVGA3D_PRIMITIVE_TRIANGLESTRIP_ADJ;
 107
 108    default:
 109       assert(0);
 110       *prim_count = 0;
 111       return 0;
 112    }
 113 }
 114
 115
 116 struct index_cache {
 117    u_generate_func generate;
 118    unsigned gen_nr;
 119
 120    /* If non-null, this buffer is filled by calling
 121     *   generate(nr, map(buffer))
 122     */
 123    struct pipe_resource *buffer;
 124 };
 125
 126
 127 /** Max number of primitives per draw call */
 128 #define QSZ SVGA3D_MAX_DRAW_PRIMITIVE_RANGES
 129
 130 struct draw_cmd {
 131    struct svga_winsys_context *swc;
 132
 133    /* vertex layout info */
 134    SVGA3dVertexDecl vdecl[SVGA3D_INPUTREG_MAX];
 135    unsigned vdecl_count;
 136    SVGA3dElementLayoutId vdecl_layout_id;
 137    unsigned vdecl_buffer_index[SVGA3D_INPUTREG_MAX];
 138
 139    /* vertex buffer info */
 140    struct pipe_vertex_buffer vbufs[SVGA3D_INPUTREG_MAX];
 141    unsigned vbuf_count;
 142
 143    SVGA3dPrimitiveRange prim[QSZ];
 144    struct pipe_resource *prim_ib[QSZ];
 145    unsigned prim_count;   /**< number of primitives for this draw */
 146    unsigned min_index[QSZ];
 147    unsigned max_index[QSZ];
 148 };
 149
 150 #define IDX_CACHE_MAX  8
 151
 152 struct svga_hwtnl {
 153    struct svga_context *svga;
 154    struct u_upload_mgr *upload_ib;
 155
 156    /* Additional negative index bias due to partial buffer uploads
 157     * This is compensated for in the offset associated with all
 158     * vertex buffers.
 159     */
 160
 161    int index_bias;
 162
 163    /* Flatshade information:
 164     */
 165    unsigned api_pv;
 166    unsigned hw_pv;
 167    unsigned api_fillmode;
 168
 169    /* Cache the results of running a particular generate func on each
 170     * primitive type.
 171     */
 172    struct index_cache index_cache[PIPE_PRIM_MAX][IDX_CACHE_MAX];
 173
 174    /* Try to build the maximal draw command packet before emitting:
 175     */
 176    struct draw_cmd cmd;
 177 };
 178
 179
 180
 181 /***********************************************************************
 182  * Internal functions
 183  */
 184 enum pipe_error
 185 svga_hwtnl_prim( struct svga_hwtnl *hwtnl,
 186                  const SVGA3dPrimitiveRange *range,
 187                  unsigned vcount,
 188                  unsigned min_index,
 189                  unsigned max_index,
 190                  struct pipe_resource *ib,
 191                  unsigned start_instance, unsigned instance_count);
 192
 193 enum pipe_error
 194 svga_hwtnl_simple_draw_range_elements( struct svga_hwtnl *hwtnl,
 195                                        struct pipe_resource *indexBuffer,
 196                                        unsigned index_size,
 197                                        int index_bias,
 198                                        unsigned min_index,
 199                                        unsigned max_index,
 200                                        unsigned prim,
 201                                        unsigned start,
 202                                        unsigned count,
 203                                        unsigned start_instance,
 204                                        unsigned instance_count);
 205
 206
 207 #endif