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 /* We use the top couple of bits in the vertex fetch index to convey a
  44  * little API information.  This limits the number of vertices we can
  45  * address to only 1 billion -- if that becomes a problem, these could
  46  * be moved out & passed separately.
  47  */
  48 #define DRAW_PT_EDGEFLAG      (1<<30)
  49 #define DRAW_PT_RESET_STIPPLE (1<<31)
  50 #define DRAW_PT_FLAG_MASK     (3<<30)
  51
  52
  53 /* The "front end" - prepare sets of fetch, draw elements for the
  54  * middle end.
  55  *
  56  * Currenly one version of this:
  57  *    - vcache - catchall implementation, decomposes to TRI/LINE/POINT prims
  58  * Later:
  59  *    - varray, varray_split
  60  *    - velement, velement_split
  61  *
  62  * Currenly only using the vcache version.
  63  */
  64 struct draw_pt_front_end {
  65    void (*prepare)( struct draw_pt_front_end *,
  66                     unsigned prim,
  67                     struct draw_pt_middle_end *,
  68                     unsigned opt );
  69
  70    void (*run)( struct draw_pt_front_end *,
  71                 pt_elt_func elt_func,
  72                 const void *elt_ptr,
  73                 unsigned count );
  74
  75    void (*finish)( struct draw_pt_front_end * );
  76    void (*destroy)( struct draw_pt_front_end * );
  77 };
  78
  79
  80 /* The "middle end" - prepares actual hardware vertices for the
  81  * hardware backend.
  82  *
  83  * Currently two versions of this:
  84  *     - fetch, vertex shade, cliptest, prim-pipeline
  85  *     - fetch, emit (ie passthrough)
  86  * Later:
  87  *     - fetch, vertex shade, cliptest, maybe-pipeline, maybe-emit
  88  *     - fetch, vertex shade, emit
  89  *
  90  * Currenly only using the passthrough version.
  91  */
  92 struct draw_pt_middle_end {
  93    void (*prepare)( struct draw_pt_middle_end *,
  94                     unsigned prim,
  95                     unsigned opt );
  96
  97    void (*run)( struct draw_pt_middle_end *,
  98                 const unsigned *fetch_elts,
  99                 unsigned fetch_count,
 100                 const ushort *draw_elts,
 101                 unsigned draw_count );
 102
 103    void (*finish)( struct draw_pt_middle_end * );
 104    void (*destroy)( struct draw_pt_middle_end * );
 105 };
 106
 107
 108 /* The "back end" - supplied by the driver, defined in draw_vbuf.h.
 109  *
 110  * Not sure whether to wrap the prim pipeline up as an alternate
 111  * backend.  Would be a win for everything except pure passthrough
 112  * mode...
 113  */
 114 struct vbuf_render;
 115
 116
 117 /* Helper functions.
 118  */
 119 pt_elt_func draw_pt_elt_func( struct draw_context *draw );
 120 const void *draw_pt_elt_ptr( struct draw_context *draw,
 121                              unsigned start );
 122
 123 /* Implementations:
 124  */
 125 struct draw_pt_front_end *draw_pt_vcache( struct draw_context *draw );
 126 struct draw_pt_middle_end *draw_pt_fetch_emit( struct draw_context *draw );
 127 struct draw_pt_middle_end *draw_pt_fetch_pipeline( struct draw_context *draw );
 128 struct draw_pt_middle_end *draw_pt_fetch_pipeline_or_emit(struct draw_context *draw);
 129
 130
 131 #endif