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 /* The "front end" - prepare sets of fetch, draw elements for the
  44  * middle end.
  45  *
  46  * Currenly one version of this:
  47  *    - vcache - catchall implementation, decomposes to TRI/LINE/POINT prims
  48  * Later:
  49  *    - varray, varray_split
  50  *    - velement, velement_split
  51  *
  52  * Currenly only using the vcache version.
  53  */
  54 struct draw_pt_front_end {
  55    void (*prepare)( struct draw_pt_front_end *,
  56                     struct draw_pt_middle_end * );
  57
  58    void (*run)( struct draw_pt_front_end *,
  59                 unsigned prim,
  60                 pt_elt_func elt_func,
  61                 const void *elt_ptr,
  62                 unsigned count );
  63
  64    void (*finish)( struct draw_pt_front_end * );
  65    void (*destroy)( struct draw_pt_front_end * );
  66 };
  67
  68
  69 /* The "middle end" - prepares actual hardware vertices for the
  70  * hardware backend.
  71  *
  72  * Currently two versions of this:
  73  *     - fetch, vertex shade, cliptest, prim-pipeline
  74  *     - fetch, emit (ie passthrough)
  75  * Later:
  76  *     - fetch, vertex shade, cliptest, maybe-pipeline, maybe-emit
  77  *     - fetch, vertex shade, emit
  78  *
  79  * Currenly only using the passthrough version.
  80  */
  81 struct draw_pt_middle_end {
  82    void (*prepare)( struct draw_pt_middle_end * );
  83
  84    void (*run)( struct draw_pt_middle_end *,
  85                 unsigned prim,
  86                 const unsigned *fetch_elts,
  87                 unsigned fetch_count,
  88                 const ushort *draw_elts,
  89                 unsigned draw_count );
  90
  91    void (*finish)( struct draw_pt_middle_end * );
  92    void (*destroy)( struct draw_pt_middle_end * );
  93 };
  94
  95
  96 /* The "back end" - supplied by the driver, defined in draw_vbuf.h.
  97  *
  98  * Not sure whether to wrap the prim pipeline up as an alternate
  99  * backend.  Would be a win for everything except pure passthrough
 100  * mode...
 101  */
 102 struct vbuf_render;
 103
 104
 105 /* Helper functions.
 106  */
 107 pt_elt_func draw_pt_elt_func( struct draw_context *draw );
 108 const void *draw_pt_elt_ptr( struct draw_context *draw,
 109                              unsigned start );
 110
 111 /* Implementations:
 112  */
 113 struct draw_pt_front_end *draw_pt_vcache( struct draw_context *draw );
 114 struct draw_pt_middle_end *draw_pt_fetch_emit( struct draw_context *draw );
 115
 116
 117
 118 #endif