src/gallium/auxiliary/draw/draw_pipe_util.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 "util/u_memory.h"
  34 #include "draw/draw_private.h"
  35 #include "draw/draw_pipe.h"
  36
  37
  38
  39 void
  40 draw_pipe_passthrough_point(struct draw_stage *stage, struct prim_header *header)
  41 {
  42    stage->next->point(stage->next, header);
  43 }
  44
  45 void
  46 draw_pipe_passthrough_line(struct draw_stage *stage, struct prim_header *header)
  47 {
  48    stage->next->line(stage->next, header);
  49 }
  50
  51 void
  52 draw_pipe_passthrough_tri(struct draw_stage *stage, struct prim_header *header)
  53 {
  54    stage->next->tri(stage->next, header);
  55 }
  56
  57
  58
  59
  60
  61 /* This is only used for temporary verts.
  62  */
  63 #define MAX_VERTEX_SIZE ((2 + PIPE_MAX_SHADER_OUTPUTS) * 4 * sizeof(float))
  64
  65
  66 /**
  67  * Allocate space for temporary post-transform vertices, such as for clipping.
  68  */
  69 boolean draw_alloc_temp_verts( struct draw_stage *stage, unsigned nr )
  70 {
  71    assert(!stage->tmp);
  72
  73    stage->tmp = NULL;
  74    stage->nr_tmps = nr;
  75
  76    if (nr != 0)
  77    {
  78       unsigned i;
  79       ubyte *store = (ubyte *) MALLOC( MAX_VERTEX_SIZE * nr );
  80
  81       if (store == NULL)
  82          return FALSE;
  83
  84       stage->tmp = (struct vertex_header **) MALLOC( sizeof(struct vertex_header *) * nr );
  85       if (stage->tmp == NULL) {
  86          FREE(store);
  87          return FALSE;
  88       }
  89
  90       for (i = 0; i < nr; i++)
  91          stage->tmp[i] = (struct vertex_header *)(store + i * MAX_VERTEX_SIZE);
  92    }
  93
  94    return TRUE;
  95 }
  96
  97
  98 void draw_free_temp_verts( struct draw_stage *stage )
  99 {
 100    if (stage->tmp) {
 101       FREE( stage->tmp[0] );
 102       FREE( stage->tmp );
 103       stage->tmp = NULL;
 104    }
 105 }
 106
 107
 108 /* Reset vertex ids.  This is basically a type of flush.
 109  *
 110  * Called only from draw_pipe_vbuf.c
 111  */
 112 void draw_reset_vertex_ids(struct draw_context *draw)
 113 {
 114    struct draw_stage *stage = draw->pipeline.first;
 115
 116    while (stage) {
 117       unsigned i;
 118
 119       for (i = 0; i < stage->nr_tmps; i++)
 120          stage->tmp[i]->vertex_id = UNDEFINED_VERTEX_ID;
 121
 122       stage = stage->next;
 123    }
 124
 125    if (draw->pipeline.verts)
 126    {
 127       unsigned i;
 128       char *verts = draw->pipeline.verts;
 129       unsigned stride = draw->pipeline.vertex_stride;
 130
 131       for (i = 0; i < draw->pipeline.vertex_count; i++) {
 132          ((struct vertex_header *)verts)->vertex_id = UNDEFINED_VERTEX_ID;
 133          verts += stride;
 134       }
 135    }
 136 }
 137