1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/* Authors: Keith Whitwell <keith@tungstengraphics.com>
*/
#include "main/imports.h"
#include "pipe/p_defines.h"
#include "draw_private.h"
struct twoside_stage {
struct draw_stage stage;
GLfloat facing;
const GLuint *lookup;
};
static INLINE struct twoside_stage *twoside_stage( struct draw_stage *stage )
{
return (struct twoside_stage *)stage;
}
static void twoside_begin( struct draw_stage *stage )
{
struct twoside_stage *twoside = twoside_stage(stage);
twoside->facing = (stage->draw->setup.front_winding == PIPE_WINDING_CW) ? 1 : -1;
stage->next->begin( stage->next );
}
static INLINE void copy_color( GLuint attr_dst,
GLuint attr_src,
struct vertex_header *v )
{
if (attr_dst && attr_src) {
memcpy( v->data[attr_dst],
v->data[attr_src],
sizeof(v->data[0]) );
}
}
static struct vertex_header *copy_bfc( struct twoside_stage *twoside,
const struct vertex_header *v,
GLuint idx )
{
struct vertex_header *tmp = dup_vert( &twoside->stage, v, idx );
copy_color( twoside->lookup[VF_ATTRIB_COLOR0],
twoside->lookup[VF_ATTRIB_BFC0],
tmp );
copy_color( twoside->lookup[VF_ATTRIB_COLOR1],
twoside->lookup[VF_ATTRIB_BFC1],
tmp );
return tmp;
}
/* Twoside tri:
*/
static void twoside_tri( struct draw_stage *stage,
struct prim_header *header )
{
struct twoside_stage *twoside = twoside_stage(stage);
if (header->det * twoside->facing < 0) {
/* this is a back-facing triangle */
struct prim_header tmp;
tmp.det = header->det;
/* copy back colors to front color slots */
tmp.v[0] = copy_bfc(twoside, header->v[0], 0);
tmp.v[1] = copy_bfc(twoside, header->v[1], 1);
tmp.v[2] = copy_bfc(twoside, header->v[2], 2);
stage->next->tri( stage->next, &tmp );
}
else {
stage->next->tri( stage->next, header );
}
}
static void twoside_line( struct draw_stage *stage,
struct prim_header *header )
{
/* pass-through */
stage->next->line( stage->next, header );
}
static void twoside_point( struct draw_stage *stage,
struct prim_header *header )
{
/* pass-through */
stage->next->point( stage->next, header );
}
static void twoside_end( struct draw_stage *stage )
{
/* pass-through */
stage->next->end( stage->next );
}
/**
* Create twoside pipeline stage.
*/
struct draw_stage *draw_twoside_stage( struct draw_context *draw )
{
struct twoside_stage *twoside = CALLOC_STRUCT(twoside_stage);
draw_alloc_tmps( &twoside->stage, 3 );
twoside->stage.draw = draw;
twoside->stage.next = NULL;
twoside->stage.begin = twoside_begin;
twoside->stage.point = twoside_point;
twoside->stage.line = twoside_line;
twoside->stage.tri = twoside_tri;
twoside->stage.end = twoside_end;
twoside->lookup = draw->vf_attr_to_slot;
return &twoside->stage;
}
|
