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
39void
40draw_pipe_passthrough_point(struct draw_stage *stage, struct prim_header *header)
41{
42   stage->next->point(stage->next, header);
43}
44
45void
46draw_pipe_passthrough_line(struct draw_stage *stage, struct prim_header *header)
47{
48   stage->next->line(stage->next, header);
49}
50
51void
52draw_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 */
69boolean 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
98void 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 */
112void 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
138