src/gallium/drivers/softpipe/sp_prim_setup.c

   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  * \brief A draw stage that drives our triangle setup routines from
  30  * within the draw pipeline.  One of two ways to drive setup, the
  31  * other being in sp_prim_vbuf.c.
  32  *
  33  * \author  Keith Whitwell <keith@tungstengraphics.com>
  34  * \author  Brian Paul
  35  */
  36
  37
  38 #include "sp_context.h"
  39 #include "sp_setup.h"
  40 #include "sp_state.h"
  41 #include "sp_prim_setup.h"
  42 #include "draw/draw_pipe.h"
  43 #include "draw/draw_vertex.h"
  44 #include "util/u_memory.h"
  45
  46 /**
  47  * Triangle setup info (derived from draw_stage).
  48  * Also used for line drawing (taking some liberties).
  49  */
  50 struct setup_stage {
  51    struct draw_stage stage; /**< This must be first (base class) */
  52
  53    struct setup_context *setup;
  54 };
  55
  56
  57
  58 /**
  59  * Basically a cast wrapper.
  60  */
  61 static INLINE struct setup_stage *setup_stage( struct draw_stage *stage )
  62 {
  63    return (struct setup_stage *)stage;
  64 }
  65
  66
  67 typedef const float (*cptrf4)[4];
  68
  69 static void
  70 do_tri(struct draw_stage *stage, struct prim_header *prim)
  71 {
  72    struct setup_stage *setup = setup_stage( stage );
  73
  74    setup_tri( setup->setup,
  75               (cptrf4)prim->v[0]->data,
  76               (cptrf4)prim->v[1]->data,
  77               (cptrf4)prim->v[2]->data );
  78 }
  79
  80 static void
  81 do_line(struct draw_stage *stage, struct prim_header *prim)
  82 {
  83    struct setup_stage *setup = setup_stage( stage );
  84
  85    setup_line( setup->setup,
  86                (cptrf4)prim->v[0]->data,
  87                (cptrf4)prim->v[1]->data );
  88 }
  89
  90 static void
  91 do_point(struct draw_stage *stage, struct prim_header *prim)
  92 {
  93    struct setup_stage *setup = setup_stage( stage );
  94
  95    setup_point( setup->setup,
  96                 (cptrf4)prim->v[0]->data );
  97 }
  98
  99
 100
 101
 102 static void setup_begin( struct draw_stage *stage )
 103 {
 104    struct setup_stage *setup = setup_stage(stage);
 105
 106    setup_prepare( setup->setup );
 107
 108    stage->point = do_point;
 109    stage->line = do_line;
 110    stage->tri = do_tri;
 111 }
 112
 113
 114 static void setup_first_point( struct draw_stage *stage,
 115                                struct prim_header *header )
 116 {
 117    setup_begin(stage);
 118    stage->point( stage, header );
 119 }
 120
 121 static void setup_first_line( struct draw_stage *stage,
 122                                struct prim_header *header )
 123 {
 124    setup_begin(stage);
 125    stage->line( stage, header );
 126 }
 127
 128
 129 static void setup_first_tri( struct draw_stage *stage,
 130                                struct prim_header *header )
 131 {
 132    setup_begin(stage);
 133    stage->tri( stage, header );
 134 }
 135
 136
 137
 138 static void setup_flush( struct draw_stage *stage,
 139                          unsigned flags )
 140 {
 141    stage->point = setup_first_point;
 142    stage->line = setup_first_line;
 143    stage->tri = setup_first_tri;
 144 }
 145
 146
 147 static void reset_stipple_counter( struct draw_stage *stage )
 148 {
 149 }
 150
 151
 152 static void render_destroy( struct draw_stage *stage )
 153 {
 154    struct setup_stage *ssetup = setup_stage(stage);
 155    setup_destroy_context(ssetup->setup);
 156    FREE( stage );
 157 }
 158
 159
 160 /**
 161  * Create a new primitive setup/render stage.
 162  */
 163 struct draw_stage *sp_draw_render_stage( struct softpipe_context *softpipe )
 164 {
 165    struct setup_stage *sstage = CALLOC_STRUCT(setup_stage);
 166
 167    sstage->setup = setup_create_context(softpipe);
 168    sstage->stage.draw = softpipe->draw;
 169    sstage->stage.point = setup_first_point;
 170    sstage->stage.line = setup_first_line;
 171    sstage->stage.tri = setup_first_tri;
 172    sstage->stage.flush = setup_flush;
 173    sstage->stage.reset_stipple_counter = reset_stipple_counter;
 174    sstage->stage.destroy = render_destroy;
 175
 176    return (struct draw_stage *)sstage;
 177 }
 178
 179 struct setup_context *
 180 sp_draw_setup_context( struct draw_stage *stage )
 181 {
 182    struct setup_stage *ssetup = setup_stage(stage);
 183    return ssetup->setup;
 184 }
 185
 186 void
 187 sp_draw_flush( struct draw_stage *stage )
 188 {
 189    stage->flush( stage, 0 );
 190 }