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
|
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <memdraw.h>
#include <geometry.h>
#include "graphics.h"
#include "internal.h"
Point
minpt(Point a, Point b)
{
return (Point){
min(a.x, b.x),
min(a.y, b.y)
};
}
Point
maxpt(Point a, Point b)
{
return (Point){
max(a.x, b.x),
max(a.y, b.y)
};
}
Point2
modulapt2(Point2 a, Point2 b)
{
return (Point2){a.x*b.x, a.y*b.y, a.w*b.w};
}
Point2
minpt2(Point2 a, Point2 b)
{
return (Point2){
min(a.x, b.x),
min(a.y, b.y),
min(a.w, b.w)
};
}
Point2
maxpt2(Point2 a, Point2 b)
{
return (Point2){
max(a.x, b.x),
max(a.y, b.y),
max(a.w, b.w)
};
}
int
eqpt2(Point2 a, Point2 b)
{
return vec2len(subpt2(a, b)) < ε2;
}
Point3
modulapt3(Point3 a, Point3 b)
{
return (Point3){a.x*b.x, a.y*b.y, a.z*b.z, a.w*b.w};
}
Point3
minpt3(Point3 a, Point3 b)
{
return (Point3){
min(a.x, b.x),
min(a.y, b.y),
min(a.z, b.z),
min(a.w, b.w)
};
}
Point3
maxpt3(Point3 a, Point3 b)
{
return (Point3){
max(a.x, b.x),
max(a.y, b.y),
max(a.z, b.z),
max(a.w, b.w)
};
}
int
eqpt3(Point3 a, Point3 b)
{
return vec3len(subpt3(a, b)) < ε2;
}
Quaternion
qsandwich(Quaternion q, Quaternion p)
{
return mulq(mulq(q, p), invq(q));
}
Point3
qsandwichpt3(Quaternion q, Point3 p)
{
Quaternion r;
r = qsandwich(q, Quatvec(0, p));
return Pt3(r.i, r.j, r.k, p.w);
}
void
memsetf(void *dp, float v, usize len)
{
float *p;
p = dp;
while(len--)
*p++ = v;
}
void
memsetl(void *dp, ulong v, usize len)
{
ulong *p;
p = dp;
while(len--)
*p++ = v;
}
Memimage *
rgba(ulong c)
{
Memimage *i;
i = eallocmemimage(UR, RGBA32);
i->flags |= Frepl;
i->clipr = Rect(-1e6, -1e6, 1e6, 1e6);
memfillcolor(i, c);
return i;
}
Memimage *
dupmemimage(Memimage *i)
{
Memimage *ni;
if(i == nil)
return nil;
ni = allocmemimaged(i->r, i->chan, i->data);
if(ni == nil)
sysfatal("allocmemimaged: %r");
ni->data->ref++;
return ni;
}
|
