src/gallium/auxiliary/draw/draw_pt.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #ifndef DRAW_PT_H
  34 #define DRAW_PT_H
  35
  36 #include "pipe/p_compiler.h"
  37
  38 typedef unsigned (*pt_elt_func)( const void *elts, unsigned idx );
  39
  40 struct draw_pt_middle_end;
  41 struct draw_context;
  42
  43
  44 #define PT_SHADE      0x1
  45 #define PT_CLIPTEST   0x2
  46 #define PT_PIPELINE   0x4
  47 #define PT_MAX_MIDDLE 0x8
  48
  49
  50 /* The "front end" - prepare sets of fetch, draw elements for the
  51  * middle end.
  52  *
  53  * Currenly one version of this:
  54  *    - vcache - catchall implementation, decomposes to TRI/LINE/POINT prims
  55  * Later:
  56  *    - varray, varray_split
  57  *    - velement, velement_split
  58  *
  59  * Currenly only using the vcache version.
  60  */
  61 struct draw_pt_front_end {
  62    void (*prepare)( struct draw_pt_front_end *,
  63                     unsigned prim,
  64                     struct draw_pt_middle_end *,
  65                     unsigned opt );
  66
  67    void (*run)( struct draw_pt_front_end *,
  68                 pt_elt_func elt_func,
  69                 const void *elt_ptr,
  70                 unsigned count );
  71
  72    void (*finish)( struct draw_pt_front_end * );
  73    void (*destroy)( struct draw_pt_front_end * );
  74 };
  75
  76
  77 /* The "middle end" - prepares actual hardware vertices for the
  78  * hardware backend.
  79  *
  80  * Currently two versions of this:
  81  *     - fetch, vertex shade, cliptest, prim-pipeline
  82  *     - fetch, emit (ie passthrough)
  83  */
  84 struct draw_pt_middle_end {
  85    void (*prepare)( struct draw_pt_middle_end *,
  86                     unsigned prim,
  87                     unsigned opt,
  88                     unsigned *max_vertices );
  89
  90    void (*run)( struct draw_pt_middle_end *,
  91                 const unsigned *fetch_elts,
  92                 unsigned fetch_count,
  93                 const ushort *draw_elts,
  94                 unsigned draw_count );
  95
  96    void (*run_linear)(struct draw_pt_middle_end *,
  97                       unsigned start,
  98                       unsigned count);
  99
 100    /* Transform all vertices in a linear range and then draw them with
 101     * the supplied element list.  May fail and return FALSE.
 102     */
 103    boolean (*run_linear_elts)( struct draw_pt_middle_end *,
 104                             unsigned fetch_start,
 105                             unsigned fetch_count,
 106                             const ushort *draw_elts,
 107                             unsigned draw_count );
 108
 109    int (*get_max_vertex_count)( struct draw_pt_middle_end * );
 110
 111    void (*finish)( struct draw_pt_middle_end * );
 112    void (*destroy)( struct draw_pt_middle_end * );
 113 };
 114
 115
 116 /* The "back end" - supplied by the driver, defined in draw_vbuf.h.
 117  */
 118 struct vbuf_render;
 119 struct vertex_header;
 120
 121
 122 /* Helper functions.
 123  */
 124 pt_elt_func draw_pt_elt_func( struct draw_context *draw );
 125 const void *draw_pt_elt_ptr( struct draw_context *draw,
 126                              unsigned start );
 127
 128 /* Frontends:
 129  *
 130  * Currently only the general-purpose vcache implementation, could add
 131  * a special case for tiny vertex buffers.
 132  */
 133 struct draw_pt_front_end *draw_pt_vcache( struct draw_context *draw );
 134 struct draw_pt_front_end *draw_pt_varray(struct draw_context *draw);
 135
 136
 137 /* Middle-ends:
 138  *
 139  * Currently one general-purpose case which can do all possibilities,
 140  * at the slight expense of creating a vertex_header in some cases
 141  * unecessarily.
 142  *
 143  * The special case fetch_emit code avoids pipeline vertices
 144  * altogether and builds hardware vertices directly from API
 145  * vertex_elements.
 146  */
 147 struct draw_pt_middle_end *draw_pt_fetch_emit( struct draw_context *draw );
 148 struct draw_pt_middle_end *draw_pt_middle_fse( struct draw_context *draw );
 149 struct draw_pt_middle_end *draw_pt_fetch_pipeline_or_emit(struct draw_context *draw);
 150
 151
 152 /* More helpers:
 153  */
 154 boolean draw_pt_get_edgeflag( struct draw_context *draw,
 155                               unsigned idx );
 156
 157
 158 /*******************************************************************************
 159  * HW vertex emit:
 160  */
 161 struct pt_emit;
 162
 163 void draw_pt_emit_prepare( struct pt_emit *emit,
 164                            unsigned prim,
 165                            unsigned *max_vertices );
 166
 167 void draw_pt_emit( struct pt_emit *emit,
 168                    const float (*vertex_data)[4],
 169                    unsigned vertex_count,
 170                    unsigned stride,
 171                    const ushort *elts,
 172                    unsigned count );
 173
 174 void draw_pt_emit_linear( struct pt_emit *emit,
 175                           const float (*vertex_data)[4],
 176                           unsigned vertex_count,
 177                           unsigned stride,
 178                           unsigned start,
 179                           unsigned count );
 180
 181 void draw_pt_emit_destroy( struct pt_emit *emit );
 182
 183 struct pt_emit *draw_pt_emit_create( struct draw_context *draw );
 184
 185
 186 /*******************************************************************************
 187  * API vertex fetch:
 188  */
 189
 190 struct pt_fetch;
 191 void draw_pt_fetch_prepare( struct pt_fetch *fetch,
 192                             unsigned vertex_size );
 193
 194 void draw_pt_fetch_run( struct pt_fetch *fetch,
 195                         const unsigned *elts,
 196                         unsigned count,
 197                         char *verts );
 198
 199 void draw_pt_fetch_run_linear( struct pt_fetch *fetch,
 200                                unsigned start,
 201                                unsigned count,
 202                                char *verts );
 203
 204 void draw_pt_fetch_destroy( struct pt_fetch *fetch );
 205
 206 struct pt_fetch *draw_pt_fetch_create( struct draw_context *draw );
 207
 208 /*******************************************************************************
 209  * Post-VS: cliptest, rhw, viewport
 210  */
 211 struct pt_post_vs;
 212
 213 boolean draw_pt_post_vs_run( struct pt_post_vs *pvs,
 214                              struct vertex_header *pipeline_verts,
 215                              unsigned stride,
 216                              unsigned count );
 217
 218 void draw_pt_post_vs_prepare( struct pt_post_vs *pvs,
 219                               boolean bypass_clipping,
 220                               boolean identity_viewport,
 221                               boolean opengl );
 222
 223 struct pt_post_vs *draw_pt_post_vs_create( struct draw_context *draw );
 224
 225 void draw_pt_post_vs_destroy( struct pt_post_vs *pvs );
 226
 227
 228 /*******************************************************************************
 229  * Utils:
 230  */
 231 void draw_pt_split_prim(unsigned prim, unsigned *first, unsigned *incr);
 232 unsigned draw_pt_reduced_prim(unsigned prim);
 233
 234
 235 #endif