koolness/3d.h at master · wbcbz7/koolness · GitHub

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
#ifndef __3D_H
#define __3D_H

#include "vec.h"
#include "fxmath.h"

// epsilon

inline vec2f proj(vec3f &f, float fov, float xres, float yres) {
    vec2f p;

    // does mirror if z < 0!

    float t = (fov / (f.z + ee));
    p.x = (f.x * t) + (xres/2);
    p.y = (f.y * t) + (yres/2);

    return p;
}

inline vec2f proj(vec4f &f, float fov, float xres, float yres) {
    vec2f p;

    // does mirror if z < 0!

    float t = (fov / (f.z + ee));
    p.x = (f.x * t) + (xres/2);
    p.y = (f.y * t) + (yres/2);

    return p;
}

inline void proj(vec2f& of, vec3f &f, float fov, float xres, float yres) {
    // does mirror if z < 0!
    float t = (fov / (f.z + ee));
    of.x = (f.x * t) + (xres/2);
    of.y = (f.y * t) + (yres/2);
}

inline void proj(vec2f& of, vec4f &f, float fov, float xres, float yres) {
    // does mirror if z < 0!
    float t = (fov / (f.z + ee));
    of.x = (f.x * t) + (xres/2);
    of.y = (f.y * t) + (yres/2);
}


#endif