src/gallium/auxiliary/draw/draw_pt.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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #include "pipe/p_util.h"
  34 #include "draw/draw_context.h"
  35 #include "draw/draw_private.h"
  36 #include "draw/draw_pt.h"
  37
  38
  39
  40
  41 /* Overall we split things into:
  42  *     - frontend -- prepare fetch_elts, draw_elts - eg vcache
  43  *     - middle   -- fetch, shade, cliptest, viewport
  44  *     - pipeline -- the prim pipeline: clipping, wide lines, etc
  45  *     - backend  -- the vbuf_render provided by the driver.
  46  */
  47 static boolean
  48 draw_pt_arrays(struct draw_context *draw,
  49                unsigned prim,
  50                unsigned start,
  51                unsigned count)
  52 {
  53    struct draw_pt_front_end *frontend = NULL;
  54    struct draw_pt_middle_end *middle = NULL;
  55    unsigned opt = 0;
  56
  57    if (!draw->render) {
  58       opt |= PT_PIPELINE;
  59    }
  60
  61    if (draw_need_pipeline(draw,
  62                           draw->rasterizer,
  63                           prim)) {
  64       opt |= PT_PIPELINE;
  65    }
  66
  67    if (!draw->bypass_clipping && !draw->pt.test_fse) {
  68       opt |= PT_CLIPTEST;
  69    }
  70
  71    if (!draw->rasterizer->bypass_vs) {
  72       opt |= PT_SHADE;
  73    }
  74
  75
  76    if (opt == 0)
  77       middle = draw->pt.middle.fetch_emit;
  78    else if (opt == PT_SHADE && draw->pt.test_fse)
  79       middle = draw->pt.middle.fetch_shade_emit;
  80    else
  81       middle = draw->pt.middle.general;
  82
  83
  84    /* Pick the right frontend
  85     */
  86    if (draw->pt.user.elts || (opt & PT_PIPELINE)) {
  87       frontend = draw->pt.front.vcache;
  88 #if 0
  89    } else if (opt == PT_SHADE && draw->pt.test_fse) {
  90       /* should be a middle end.. */
  91       frontend = draw->pt.front.fetch_shade_emit;
  92 #endif
  93    } else {
  94       frontend = draw->pt.front.varray;
  95    }
  96
  97    frontend->prepare( frontend, prim, middle, opt );
  98
  99    frontend->run(frontend,
 100                  draw_pt_elt_func(draw),
 101                  draw_pt_elt_ptr(draw, start),
 102                  count);
 103
 104    frontend->finish( frontend );
 105
 106    return TRUE;
 107 }
 108
 109
 110 boolean draw_pt_init( struct draw_context *draw )
 111 {
 112    draw->pt.test_fse = GETENV("DRAW_FSE") != NULL;
 113
 114    draw->pt.front.vcache = draw_pt_vcache( draw );
 115    if (!draw->pt.front.vcache)
 116       return FALSE;
 117
 118    draw->pt.front.varray = draw_pt_varray(draw);
 119    if (!draw->pt.front.varray)
 120       return FALSE;
 121
 122    draw->pt.middle.fetch_emit = draw_pt_fetch_emit( draw );
 123    if (!draw->pt.middle.fetch_emit)
 124       return FALSE;
 125
 126    if (draw->pt.test_fse) {
 127       draw->pt.middle.fetch_shade_emit = draw_pt_middle_fse( draw );
 128       if (!draw->pt.middle.fetch_shade_emit)
 129          return FALSE;
 130
 131       draw->pt.front.fetch_shade_emit = draw_pt_fetch_shade_emit( draw );
 132       if (!draw->pt.front.fetch_shade_emit)
 133          return FALSE;
 134    }
 135
 136
 137    draw->pt.middle.general = draw_pt_fetch_pipeline_or_emit( draw );
 138    if (!draw->pt.middle.general)
 139       return FALSE;
 140
 141    return TRUE;
 142 }
 143
 144
 145 void draw_pt_destroy( struct draw_context *draw )
 146 {
 147    if (draw->pt.middle.general) {
 148       draw->pt.middle.general->destroy( draw->pt.middle.general );
 149       draw->pt.middle.general = NULL;
 150    }
 151
 152    if (draw->pt.middle.fetch_emit) {
 153       draw->pt.middle.fetch_emit->destroy( draw->pt.middle.fetch_emit );
 154       draw->pt.middle.fetch_emit = NULL;
 155    }
 156
 157    if (draw->pt.middle.fetch_shade_emit) {
 158       draw->pt.middle.fetch_shade_emit->destroy( draw->pt.middle.fetch_shade_emit );
 159       draw->pt.middle.fetch_shade_emit = NULL;
 160    }
 161
 162    if (draw->pt.front.fetch_shade_emit) {
 163       draw->pt.front.fetch_shade_emit->destroy( draw->pt.front.fetch_shade_emit );
 164       draw->pt.front.fetch_shade_emit = NULL;
 165    }
 166
 167    if (draw->pt.front.vcache) {
 168       draw->pt.front.vcache->destroy( draw->pt.front.vcache );
 169       draw->pt.front.vcache = NULL;
 170    }
 171
 172    if (draw->pt.front.varray) {
 173       draw->pt.front.varray->destroy( draw->pt.front.varray );
 174       draw->pt.front.varray = NULL;
 175    }
 176 }
 177
 178
 179
 180
 181 /**
 182  * Draw vertex arrays
 183  * This is the main entrypoint into the drawing module.
 184  * \param prim  one of PIPE_PRIM_x
 185  * \param start  index of first vertex to draw
 186  * \param count  number of vertices to draw
 187  */
 188 void
 189 draw_arrays(struct draw_context *draw, unsigned prim,
 190             unsigned start, unsigned count)
 191 {
 192    unsigned reduced_prim = draw_pt_reduced_prim(prim);
 193    if (reduced_prim != draw->reduced_prim) {
 194       draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
 195       draw->reduced_prim = reduced_prim;
 196    }
 197
 198    /* drawing done here: */
 199    draw_pt_arrays(draw, prim, start, count);
 200 }
 201
 202 boolean draw_pt_get_edgeflag( struct draw_context *draw,
 203                               unsigned idx )
 204 {
 205    if (draw->pt.user.edgeflag)
 206       return (draw->pt.user.edgeflag[idx/32] & (1 << (idx%32))) != 0;
 207    else
 208       return 1;
 209 }