src/gallium/drivers/svga/svga_draw_private.h

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
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   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
  51
  52 /**
  53  * Translate a gallium PIPE_PRIM_x value to an SVGA3D_PRIMITIVE_x value.
  54  * Also, compute the number of primitives that'll be drawn given a
  55  * vertex count.
  56  * Note that this function doesn't have to handle PIPE_PRIM_LINE_LOOP,
  57  * PIPE_PRIM_QUADS, PIPE_PRIM_QUAD_STRIP or PIPE_PRIM_POLYGON.  We convert
  58  * those to other types of primitives with index/translation code.
  59  */
  60 static inline unsigned
  61 svga_translate_prim(unsigned mode, unsigned vcount,unsigned *prim_count)
  62 {
  63    switch (mode) {
  64    case PIPE_PRIM_POINTS:
  65       *prim_count = vcount;
  66       return SVGA3D_PRIMITIVE_POINTLIST;
  67
  68    case PIPE_PRIM_LINES:
  69       *prim_count = vcount / 2;
  70       return SVGA3D_PRIMITIVE_LINELIST;
  71
  72    case PIPE_PRIM_LINE_STRIP:
  73       *prim_count = vcount - 1;
  74       return SVGA3D_PRIMITIVE_LINESTRIP;
  75
  76    case PIPE_PRIM_TRIANGLES:
  77       *prim_count = vcount / 3;
  78       return SVGA3D_PRIMITIVE_TRIANGLELIST;
  79
  80    case PIPE_PRIM_TRIANGLE_STRIP:
  81       *prim_count = vcount - 2;
  82       return SVGA3D_PRIMITIVE_TRIANGLESTRIP;
  83
  84    case PIPE_PRIM_TRIANGLE_FAN:
  85       *prim_count = vcount - 2;
  86       return SVGA3D_PRIMITIVE_TRIANGLEFAN;
  87
  88    default:
  89       assert(0);
  90       *prim_count = 0;
  91       return 0;
  92    }
  93 }
  94
  95
  96 struct index_cache {
  97    u_generate_func generate;
  98    unsigned gen_nr;
  99
 100    /* If non-null, this buffer is filled by calling
 101     *   generate(nr, map(buffer))
 102     */
 103    struct pipe_resource *buffer;
 104 };
 105
 106
 107 /** Max number of primitives per draw call */
 108 #define QSZ SVGA3D_MAX_DRAW_PRIMITIVE_RANGES
 109
 110 struct draw_cmd {
 111    struct svga_winsys_context *swc;
 112
 113    SVGA3dVertexDecl vdecl[SVGA3D_INPUTREG_MAX];
 114    struct pipe_resource *vdecl_vb[SVGA3D_INPUTREG_MAX];
 115    unsigned vdecl_count;
 116
 117    SVGA3dPrimitiveRange prim[QSZ];
 118    struct pipe_resource *prim_ib[QSZ];
 119    unsigned prim_count;
 120    unsigned min_index[QSZ];
 121    unsigned max_index[QSZ];
 122 };
 123
 124 #define IDX_CACHE_MAX  8
 125
 126 struct svga_hwtnl {
 127    struct svga_context *svga;
 128    struct u_upload_mgr *upload_ib;
 129
 130    /* Additional negative index bias due to partial buffer uploads
 131     * This is compensated for in the offset associated with all
 132     * vertex buffers.
 133     */
 134
 135    int index_bias;
 136
 137    /* Flatshade information:
 138     */
 139    unsigned api_pv;
 140    unsigned hw_pv;
 141    unsigned api_fillmode;
 142
 143    /* Cache the results of running a particular generate func on each
 144     * primitive type.
 145     */
 146    struct index_cache index_cache[PIPE_PRIM_MAX][IDX_CACHE_MAX];
 147
 148    /* Try to build the maximal draw command packet before emitting:
 149     */
 150    struct draw_cmd cmd;
 151 };
 152
 153
 154
 155 /***********************************************************************
 156  * Internal functions
 157  */
 158 enum pipe_error
 159 svga_hwtnl_prim( struct svga_hwtnl *hwtnl,
 160                  const SVGA3dPrimitiveRange *range,
 161                  unsigned min_index,
 162                  unsigned max_index,
 163                  struct pipe_resource *ib );
 164
 165 enum pipe_error
 166 svga_hwtnl_simple_draw_range_elements( struct svga_hwtnl *hwtnl,
 167                                        struct pipe_resource *indexBuffer,
 168                                        unsigned index_size,
 169                                        int index_bias,
 170                                        unsigned min_index,
 171                                        unsigned max_index,
 172                                        unsigned prim,
 173                                        unsigned start,
 174                                        unsigned count );
 175
 176
 177 #endif