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
|
#include "EditorHelpers.hpp"
#include <cmath>
#include <glm/gtc/matrix_inverse.hpp>
#include <vector>
namespace renderer {
namespace editor {
Mesh makeWireCube ( float size ) {
float h = size * 0.5f;
std::vector<float> verts = {
-h, -h, -h, h, -h, -h, h, -h, -h, h, -h, h, h, -h, h, -h, -h, h, -h, -h, h, -h, -h, -h,
-h, h, -h, h, h, -h, h, h, -h, h, h, h, h, h, h, -h, h, h, -h, h, h, -h, h, -h,
-h, -h, -h, -h, h, -h, h, -h, -h, h, h, -h, h, -h, h, h, h, h, -h, -h, h, -h, h, h };
Mesh m;
m.createFromPositions( verts, true );
return m;
}
Mesh makeCircleWire ( float radius, int segments ) {
if( segments < 3 )
segments = 3;
std::vector<float> verts;
verts.reserve( segments * 3 );
const float twoPi = 6.28318530717958647692f;
for( int i = 0; i < segments; ++i ) {
int ni = ( i + 1 ) % segments;
float ti = (float)i / (float)segments;
float angi = ti * twoPi;
float xi = cosf( angi ) * radius;
float zi = sinf( angi ) * radius;
float tni = (float)ni / (float)segments;
float angni = tni * twoPi;
float xni = cosf( angni ) * radius;
float zni = sinf( angni ) * radius;
verts.push_back( xi );
verts.push_back( 0.0f );
verts.push_back( zi );
verts.push_back( xni );
verts.push_back( 0.0f );
verts.push_back( zni );
}
Mesh m;
m.createFromPositions( verts, true );
return m;
}
Mesh makeCircleFilled ( float radius, int segments ) {
if( segments < 3 )
segments = 3;
std::vector<float> data;
data.reserve( ( segments + 2 ) * 5 );
const float twoPi = 6.28318530717958647692f;
float cx = 0.0f, cz = 0.0f;
float cu = 0.5f, cv = 0.5f;
for( int i = 0; i < segments; ++i ) {
int i1 = i;
int i2 = ( i + 1 ) % segments;
float t1 = (float)i1 / (float)segments;
float ang1 = t1 * twoPi;
float x1 = cosf( ang1 ) * radius;
float z1 = sinf( ang1 ) * radius;
float u1 = ( x1 / ( radius * 2.0f ) ) + 0.5f;
float v1 = ( z1 / ( radius * 2.0f ) ) + 0.5f;
float t2 = (float)i2 / (float)segments;
float ang2 = t2 * twoPi;
float x2 = cosf( ang2 ) * radius;
float z2 = sinf( ang2 ) * radius;
float u2 = ( x2 / ( radius * 2.0f ) ) + 0.5f;
float v2 = ( z2 / ( radius * 2.0f ) ) + 0.5f;
data.push_back( cx );
data.push_back( 0.0f );
data.push_back( cz );
data.push_back( cu );
data.push_back( cv );
data.push_back( x1 );
data.push_back( 0.0f );
data.push_back( z1 );
data.push_back( u1 );
data.push_back( v1 );
data.push_back( x2 );
data.push_back( 0.0f );
data.push_back( z2 );
data.push_back( u2 );
data.push_back( v2 );
}
Mesh m;
m.createFromPosTex( data );
return m;
}
bool makeRayFromMouse ( const glm::vec2& mousePx, int fbw, int fbh, const glm::mat4& view,
const glm::mat4& proj, const glm::vec3& camPos, glm::vec3& outOrigin,
glm::vec3& outDir ) {
if( fbw <= 0 || fbh <= 0 )
return false;
float ndcX = ( mousePx.x / (float)fbw ) * 2.0f - 1.0f;
float ndcY = 1.0f - ( mousePx.y / (float)fbh ) * 2.0f;
glm::vec4 nearPointNDC( ndcX, ndcY, -1.0f, 1.0f );
glm::vec4 farPointNDC( ndcX, ndcY, 1.0f, 1.0f );
glm::mat4 invPV = glm::inverse( proj * view );
glm::vec4 nearWorld = invPV * nearPointNDC;
glm::vec4 farWorld = invPV * farPointNDC;
if( nearWorld.w == 0.0f || farWorld.w == 0.0f )
return false;
nearWorld /= nearWorld.w;
farWorld /= farWorld.w;
glm::vec3 nearPos = glm::vec3( nearWorld );
glm::vec3 farPos = glm::vec3( farWorld );
outOrigin = nearPos;
outDir = glm::normalize( farPos - nearPos );
if( !isfinite( outDir.x ) || !isfinite( outDir.y ) || !isfinite( outDir.z ) ) {
outOrigin = camPos;
outDir = glm::normalize( glm::vec3( 0.0f, 0.0f, -1.0f ) );
}
return true;
}
} // namespace editor
} // namespace renderer
|
