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
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   9  * of the Software, and to permit persons to whom the Software is
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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 "util/u_prim.h"
  33 #include "svga_context.h"
  34 #include "svga_hw_reg.h"
  35 #include "svga3d_shaderdefs.h"
  36
  37 struct svga_context;
  38 struct u_upload_mgr;
  39
  40 /**
  41  * Mask indicating which types of gallium primitives are actually
  42  * handled by the svga device.  Other types will be converted to
  43  * these types by the index/translation code.
  44  */
  45 static const unsigned svga_hw_prims =
  46    ((1 << PIPE_PRIM_POINTS) |
  47     (1 << PIPE_PRIM_LINES) |
  48     (1 << PIPE_PRIM_LINE_STRIP) |
  49     (1 << PIPE_PRIM_TRIANGLES) |
  50     (1 << PIPE_PRIM_TRIANGLE_STRIP) |
  51     (1 << PIPE_PRIM_TRIANGLE_FAN) |
  52     (1 << PIPE_PRIM_LINES_ADJACENCY) |
  53     (1 << PIPE_PRIM_LINE_STRIP_ADJACENCY) |
  54     (1 << PIPE_PRIM_TRIANGLES_ADJACENCY) |
  55     (1 << PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY));
  56
  57
  58 /**
  59  * Translate a gallium PIPE_PRIM_x value to an SVGA3D_PRIMITIVE_x value.
  60  * Also, compute the number of primitives that'll be drawn given a
  61  * vertex count.
  62  * Note that this function doesn't have to handle PIPE_PRIM_LINE_LOOP,
  63  * PIPE_PRIM_QUADS, PIPE_PRIM_QUAD_STRIP or PIPE_PRIM_POLYGON.  We convert
  64  * those to other types of primitives with index/translation code.
  65  */
  66 static inline SVGA3dPrimitiveType
  67 svga_translate_prim(unsigned mode, unsigned vcount, unsigned *prim_count)
  68 {
  69    switch (mode) {
  70    case PIPE_PRIM_POINTS:
  71       *prim_count = vcount;
  72       return SVGA3D_PRIMITIVE_POINTLIST;
  73
  74    case PIPE_PRIM_LINES:
  75       *prim_count = vcount / 2;
  76       return SVGA3D_PRIMITIVE_LINELIST;
  77
  78    case PIPE_PRIM_LINE_STRIP:
  79       *prim_count = vcount - 1;
  80       return SVGA3D_PRIMITIVE_LINESTRIP;
  81
  82    case PIPE_PRIM_TRIANGLES:
  83       *prim_count = vcount / 3;
  84       return SVGA3D_PRIMITIVE_TRIANGLELIST;
  85
  86    case PIPE_PRIM_TRIANGLE_STRIP:
  87       *prim_count = vcount - 2;
  88       return SVGA3D_PRIMITIVE_TRIANGLESTRIP;
  89
  90    case PIPE_PRIM_TRIANGLE_FAN:
  91       *prim_count = vcount - 2;
  92       return SVGA3D_PRIMITIVE_TRIANGLEFAN;
  93
  94    case PIPE_PRIM_LINES_ADJACENCY:
  95       *prim_count = vcount / 4;
  96       return SVGA3D_PRIMITIVE_LINELIST_ADJ;
  97
  98    case PIPE_PRIM_LINE_STRIP_ADJACENCY:
  99       *prim_count = vcount - 3;
 100       return SVGA3D_PRIMITIVE_LINESTRIP_ADJ;
 101
 102    case PIPE_PRIM_TRIANGLES_ADJACENCY:
 103       *prim_count = vcount / 6;
 104       return SVGA3D_PRIMITIVE_TRIANGLELIST_ADJ;
 105
 106    case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
 107       *prim_count = vcount / 2 - 2 ;
 108       return SVGA3D_PRIMITIVE_TRIANGLESTRIP_ADJ;
 109
 110    default:
 111       assert(0);
 112       *prim_count = 0;
 113       return 0;
 114    }
 115 }
 116
 117
 118 struct index_cache {
 119    u_generate_func generate;
 120    unsigned gen_nr;
 121
 122    /* If non-null, this buffer is filled by calling generate(nr, map(buffer))
 123     */
 124    struct pipe_resource *buffer;
 125 };
 126
 127
 128 /** Max number of primitives per draw call */
 129 #define QSZ SVGA3D_MAX_DRAW_PRIMITIVE_RANGES
 130
 131 struct draw_cmd {
 132    struct svga_winsys_context *swc;
 133
 134    /* vertex layout info */
 135    SVGA3dVertexDecl vdecl[SVGA3D_INPUTREG_MAX];
 136    unsigned vdecl_count;
 137    SVGA3dElementLayoutId vdecl_layout_id;
 138    unsigned vdecl_buffer_index[SVGA3D_INPUTREG_MAX];
 139
 140    /* vertex buffer info */
 141    struct pipe_vertex_buffer vbufs[SVGA3D_INPUTREG_MAX];
 142    unsigned vbuf_count;
 143
 144    SVGA3dPrimitiveRange prim[QSZ];
 145    struct pipe_resource *prim_ib[QSZ];
 146    unsigned prim_count;   /**< number of primitives for this draw */
 147    unsigned min_index[QSZ];
 148    unsigned max_index[QSZ];
 149 };
 150
 151 #define IDX_CACHE_MAX  8
 152
 153 struct svga_hwtnl {
 154    struct svga_context *svga;
 155    struct u_upload_mgr *upload_ib;
 156
 157    /* Additional negative index bias due to partial buffer uploads
 158     * This is compensated for in the offset associated with all
 159     * vertex buffers.
 160     */
 161    int index_bias;
 162
 163    /* Provoking vertex information (for flat shading). */
 164    unsigned api_pv;  /**< app-requested PV mode (PV_FIRST or PV_LAST) */
 165    unsigned hw_pv;   /**< device-supported PV mode (PV_FIRST or PV_LAST) */
 166
 167    /* The triangle fillmode for the device (one of PIPE_POLYGON_MODE_{FILL,
 168     * LINE,POINT}).  If the polygon front mode matches the back mode,
 169     * api_fillmode will be that mode.  Otherwise, api_fillmode will be
 170     * PIPE_POLYGON_MODE_FILL.
 171     */
 172    unsigned api_fillmode;
 173
 174    /* Cache the results of running a particular generate func on each
 175     * primitive type.
 176     */
 177    struct index_cache index_cache[PIPE_PRIM_MAX][IDX_CACHE_MAX];
 178
 179    /* Try to build the maximal draw command packet before emitting:
 180     */
 181    struct draw_cmd cmd;
 182 };
 183
 184
 185
 186 /**
 187  * Do we need to use the gallium 'indices' helper to render unfilled
 188  * triangles?
 189  */
 190 static inline boolean
 191 svga_need_unfilled_fallback(const struct svga_hwtnl *hwtnl,
 192                             enum pipe_prim_type prim)
 193 {
 194    if (u_reduced_prim(prim) != PIPE_PRIM_TRIANGLES) {
 195       /* if we're drawing points or lines, no fallback needed */
 196       return FALSE;
 197    }
 198
 199    if ((prim == PIPE_PRIM_QUADS ||
 200         prim == PIPE_PRIM_QUAD_STRIP ||
 201         prim == PIPE_PRIM_POLYGON) &&
 202        hwtnl->api_fillmode == PIPE_POLYGON_MODE_LINE) {
 203       /* We can't directly render quads or polygons.  They're
 204        * converted to triangles.  If we let the device draw the triangle
 205        * outlines we'll get an extra, stray lines in the interiors.
 206        * So, to draw unfilled quads correctly, we need the fallback.
 207        */
 208       return true;
 209    }
 210    return false;
 211 }
 212
 213
 214 enum pipe_error
 215 svga_hwtnl_prim(struct svga_hwtnl *hwtnl,
 216                 const SVGA3dPrimitiveRange *range,
 217                 unsigned vcount,
 218                 unsigned min_index,
 219                 unsigned max_index,
 220                 struct pipe_resource *ib,
 221                 unsigned start_instance, unsigned instance_count);
 222
 223 enum pipe_error
 224 svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
 225                                       struct pipe_resource *indexBuffer,
 226                                       unsigned index_size,
 227                                       int index_bias,
 228                                       unsigned min_index,
 229                                       unsigned max_index,
 230                                       enum pipe_prim_type prim,
 231                                       unsigned start,
 232                                       unsigned count,
 233                                       unsigned start_instance,
 234                                       unsigned instance_count);
 235
 236 #endif