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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* Mesa 3-D graphics library
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* Copyright (C) 2010 LunarG Inc.
*
* 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, sublicense,
* 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
static void
FUNC(FUNC_VARS)
{
unsigned first, incr;
LOCAL_VARS
/*
* prim, start, count, and max_count_{simple,loop,fan} should have been
* defined
*/
if (0) {
debug_printf("%s: prim 0x%x, start %d, count %d, max_count_simple %d, "
"max_count_loop %d, max_count_fan %d\n",
__FUNCTION__, prim, start, count, max_count_simple,
max_count_loop, max_count_fan);
}
draw_pt_split_prim(prim, &first, &incr);
/* sanitize primitive length */
count = draw_pt_trim_count(count, first, incr);
if (count < first)
return;
/* try flushing the entire primitive */
if (PRIMITIVE(start, count))
return;
/* must be able to at least flush two complete primitives */
assert(max_count_simple >= first + incr &&
max_count_loop >= first + incr &&
max_count_fan >= first + incr);
/* no splitting required */
if (count <= max_count_simple) {
SEGMENT_SIMPLE(0x0, start, count);
}
else {
const unsigned rollback = first - incr;
unsigned flags = DRAW_SPLIT_AFTER, seg_start = 0, seg_max;
/*
* Both count and seg_max below are explicitly trimmed. Because
*
* seg_start = N * (seg_max - rollback) = N' * incr,
*
* we have
*
* remaining = count - seg_start = first + N'' * incr.
*
* That is, remaining is implicitly trimmed.
*/
switch (prim) {
case PIPE_PRIM_POINTS:
case PIPE_PRIM_LINES:
case PIPE_PRIM_LINE_STRIP:
case PIPE_PRIM_TRIANGLES:
case PIPE_PRIM_TRIANGLE_STRIP:
case PIPE_PRIM_QUADS:
case PIPE_PRIM_QUAD_STRIP:
case PIPE_PRIM_LINES_ADJACENCY:
case PIPE_PRIM_LINE_STRIP_ADJACENCY:
case PIPE_PRIM_TRIANGLES_ADJACENCY:
case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
seg_max =
draw_pt_trim_count(MIN2(max_count_simple, count), first, incr);
if (prim == PIPE_PRIM_TRIANGLE_STRIP ||
prim == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY) {
/* make sure we flush even number of triangles at a time */
if (seg_max < count && !(((seg_max - first) / incr) & 1))
seg_max -= incr;
}
do {
const unsigned remaining = count - seg_start;
if (remaining > seg_max) {
SEGMENT_SIMPLE(flags, start + seg_start, seg_max);
seg_start += seg_max - rollback;
flags |= DRAW_SPLIT_BEFORE;
}
else {
flags &= ~DRAW_SPLIT_AFTER;
SEGMENT_SIMPLE(flags, start + seg_start, remaining);
seg_start += remaining;
}
} while (seg_start < count);
break;
case PIPE_PRIM_LINE_LOOP:
seg_max =
draw_pt_trim_count(MIN2(max_count_loop, count), first, incr);
do {
const unsigned remaining = count - seg_start;
if (remaining > seg_max) {
SEGMENT_LOOP(flags, start + seg_start, seg_max, start);
seg_start += seg_max - rollback;
flags |= DRAW_SPLIT_BEFORE;
}
else {
flags &= ~DRAW_SPLIT_AFTER;
SEGMENT_LOOP(flags, start + seg_start, remaining, start);
seg_start += remaining;
}
} while (seg_start < count);
break;
case PIPE_PRIM_TRIANGLE_FAN:
case PIPE_PRIM_POLYGON:
seg_max =
draw_pt_trim_count(MIN2(max_count_fan, count), first, incr);
do {
const unsigned remaining = count - seg_start;
if (remaining > seg_max) {
SEGMENT_FAN(flags, start + seg_start, seg_max, start);
seg_start += seg_max - rollback;
flags |= DRAW_SPLIT_BEFORE;
}
else {
flags &= ~DRAW_SPLIT_AFTER;
SEGMENT_FAN(flags, start + seg_start, remaining, start);
seg_start += remaining;
}
} while (seg_start < count);
break;
default:
assert(0);
break;
}
}
}
#undef FUNC
#undef FUNC_VARS
#undef LOCAL_VARS
#undef PRIMITIVE
#undef SEGMENT_SIMPLE
#undef SEGMENT_LOOP
#undef SEGMENT_FAN
|
