src/gallium/drivers/svga/svga_draw_private.h

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
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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     (1 << PIPE_PRIM_PATCHES));
  57
  58
  59 /**
  60  * Translate a gallium PIPE_PRIM_x value to an SVGA3D_PRIMITIVE_x value.
  61  * Also, compute the number of primitives that'll be drawn given a
  62  * vertex count.
  63  * Note that this function doesn't have to handle PIPE_PRIM_LINE_LOOP,
  64  * PIPE_PRIM_QUADS, PIPE_PRIM_QUAD_STRIP or PIPE_PRIM_POLYGON.  We convert
  65  * those to other types of primitives with index/translation code.
  66  */
  67 static inline SVGA3dPrimitiveType
  68 svga_translate_prim(unsigned mode, unsigned vcount, unsigned *prim_count,
  69                     ubyte vertices_per_patch)
  70 {
  71    switch (mode) {
  72    case PIPE_PRIM_POINTS:
  73       *prim_count = vcount;
  74       return SVGA3D_PRIMITIVE_POINTLIST;
  75
  76    case PIPE_PRIM_LINES:
  77       *prim_count = vcount / 2;
  78       return SVGA3D_PRIMITIVE_LINELIST;
  79
  80    case PIPE_PRIM_LINE_STRIP:
  81       *prim_count = vcount - 1;
  82       return SVGA3D_PRIMITIVE_LINESTRIP;
  83
  84    case PIPE_PRIM_TRIANGLES:
  85       *prim_count = vcount / 3;
  86       return SVGA3D_PRIMITIVE_TRIANGLELIST;
  87
  88    case PIPE_PRIM_TRIANGLE_STRIP:
  89       *prim_count = vcount - 2;
  90       return SVGA3D_PRIMITIVE_TRIANGLESTRIP;
  91
  92    case PIPE_PRIM_TRIANGLE_FAN:
  93       *prim_count = vcount - 2;
  94       return SVGA3D_PRIMITIVE_TRIANGLEFAN;
  95
  96    case PIPE_PRIM_LINES_ADJACENCY:
  97       *prim_count = vcount / 4;
  98       return SVGA3D_PRIMITIVE_LINELIST_ADJ;
  99
 100    case PIPE_PRIM_LINE_STRIP_ADJACENCY:
 101       *prim_count = vcount - 3;
 102       return SVGA3D_PRIMITIVE_LINESTRIP_ADJ;
 103
 104    case PIPE_PRIM_TRIANGLES_ADJACENCY:
 105       *prim_count = vcount / 6;
 106       return SVGA3D_PRIMITIVE_TRIANGLELIST_ADJ;
 107
 108    case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
 109       *prim_count = vcount / 2 - 2 ;
 110       return SVGA3D_PRIMITIVE_TRIANGLESTRIP_ADJ;
 111
 112    case PIPE_PRIM_PATCHES:
 113       *prim_count = vcount / vertices_per_patch ;
 114       assert(vertices_per_patch >= 1);
 115       assert(vertices_per_patch <= 32);
 116       return (SVGA3D_PRIMITIVE_1_CONTROL_POINT_PATCH - 1)
 117              + vertices_per_patch;
 118
 119    default:
 120       assert(0);
 121       *prim_count = 0;
 122       return 0;
 123    }
 124 }
 125
 126
 127 struct index_cache {
 128    u_generate_func generate;
 129    unsigned gen_nr;
 130
 131    /* If non-null, this buffer is filled by calling generate(nr, map(buffer))
 132     */
 133    struct pipe_resource *buffer;
 134 };
 135
 136
 137 /** Max number of primitives per draw call */
 138 #define QSZ SVGA3D_MAX_DRAW_PRIMITIVE_RANGES
 139
 140 struct draw_cmd {
 141    struct svga_winsys_context *swc;
 142
 143    /* vertex layout info */
 144    SVGA3dVertexDecl vdecl[SVGA3D_INPUTREG_MAX];
 145    unsigned vdecl_count;
 146    SVGA3dElementLayoutId vdecl_layout_id;
 147    unsigned vdecl_buffer_index[SVGA3D_INPUTREG_MAX];
 148
 149    /* vertex buffer info */
 150    struct pipe_vertex_buffer vbufs[SVGA3D_INPUTREG_MAX];
 151    unsigned vbuf_count;
 152
 153    SVGA3dPrimitiveRange prim[QSZ];
 154    struct pipe_resource *prim_ib[QSZ];
 155    unsigned prim_count;   /**< number of primitives for this draw */
 156    unsigned min_index[QSZ];
 157    unsigned max_index[QSZ];
 158 };
 159
 160 #define IDX_CACHE_MAX  8
 161
 162 struct svga_hwtnl {
 163    struct svga_context *svga;
 164    struct u_upload_mgr *upload_ib;
 165
 166    /* Additional negative index bias due to partial buffer uploads
 167     * This is compensated for in the offset associated with all
 168     * vertex buffers.
 169     */
 170    int index_bias;
 171
 172    /* Provoking vertex information (for flat shading). */
 173    unsigned api_pv;  /**< app-requested PV mode (PV_FIRST or PV_LAST) */
 174    unsigned hw_pv;   /**< device-supported PV mode (PV_FIRST or PV_LAST) */
 175
 176    /* The triangle fillmode for the device (one of PIPE_POLYGON_MODE_{FILL,
 177     * LINE,POINT}).  If the polygon front mode matches the back mode,
 178     * api_fillmode will be that mode.  Otherwise, api_fillmode will be
 179     * PIPE_POLYGON_MODE_FILL.
 180     */
 181    unsigned api_fillmode;
 182
 183    /* Cache the results of running a particular generate func on each
 184     * primitive type.
 185     */
 186    struct index_cache index_cache[PIPE_PRIM_MAX][IDX_CACHE_MAX];
 187
 188    /* Try to build the maximal draw command packet before emitting:
 189     */
 190    struct draw_cmd cmd;
 191 };
 192
 193
 194
 195 /**
 196  * Do we need to use the gallium 'indices' helper to render unfilled
 197  * triangles?
 198  */
 199 static inline boolean
 200 svga_need_unfilled_fallback(const struct svga_hwtnl *hwtnl,
 201                             enum pipe_prim_type prim)
 202 {
 203    if (u_reduced_prim(prim) != PIPE_PRIM_TRIANGLES) {
 204       /* if we're drawing points or lines, no fallback needed */
 205       return FALSE;
 206    }
 207
 208    if ((prim == PIPE_PRIM_QUADS ||
 209         prim == PIPE_PRIM_QUAD_STRIP ||
 210         prim == PIPE_PRIM_POLYGON) &&
 211        hwtnl->api_fillmode == PIPE_POLYGON_MODE_LINE) {
 212       /* We can't directly render quads or polygons.  They're
 213        * converted to triangles.  If we let the device draw the triangle
 214        * outlines we'll get an extra, stray lines in the interiors.
 215        * So, to draw unfilled quads correctly, we need the fallback.
 216        */
 217       return true;
 218    }
 219    return false;
 220 }
 221
 222
 223 enum pipe_error
 224 svga_hwtnl_prim(struct svga_hwtnl *hwtnl,
 225                 const SVGA3dPrimitiveRange *range,
 226                 unsigned vcount,
 227                 unsigned min_index,
 228                 unsigned max_index,
 229                 struct pipe_resource *ib,
 230                 unsigned start_instance, unsigned instance_count,
 231                 const struct pipe_draw_indirect_info *indirect,
 232                 const struct pipe_stream_output_target *so_vertex_count);
 233
 234 enum pipe_error
 235 svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
 236                                       struct pipe_resource *indexBuffer,
 237                                       unsigned index_size,
 238                                       int index_bias,
 239                                       unsigned min_index,
 240                                       unsigned max_index,
 241                                       enum pipe_prim_type prim,
 242                                       unsigned start,
 243                                       unsigned count,
 244                                       unsigned start_instance,
 245                                       unsigned instance_count,
 246                                       ubyte vertices_per_patch);
 247
 248 #endif