inochi2d.math.camera source code

1 /*
2     Inochi2D Camera
3 
4     Copyright © 2020, Inochi2D Project
5     Distributed under the 2-Clause BSD License, see LICENSE file.
6     
7     Authors: Luna Nielsen
8 */
9 module inochi2d.math.camera;
10 import inochi2d.math;
11 import inochi2d;
12 
13 /**
14     An orthographic camera
15 */
16 class Camera {
17 private:
18     mat4 projection;
19 
20 public:
21 
22     /**
23         Position of camera
24     */
25     vec2 position = vec2(0, 0);
26 
27     /**
28         Size of the camera
29     */
30     vec2 scale = vec2(1, 1);
31 
32     vec2 getRealSize() {
33         int width, height;
34         inGetViewport(width, height);
35 
36         return vec2(cast(float)width/scale.x, cast(float)height/scale.y);
37     }
38 
39     vec2 getCenterOffset() {
40         vec2 realSize = getRealSize();
41         return realSize/2;
42     }
43 
44     /**
45         Matrix for this camera
46 
47         width = width of camera area
48         height = height of camera area
49     */
50     mat4 matrix() {
51         vec2 realSize = getRealSize();
52         if(!position.isFinite) position = vec2(0);
53         if(!scale.isFinite) scale = vec2(1);
54         if(!realSize.isFinite) return mat4.identity;
55 
56         return 
57             mat4.orthographic(0f, realSize.x, realSize.y, 0, 0, ushort.max) * 
58             mat4.translation(position.x+(realSize.x/2), position.y+(realSize.y/2), -(ushort.max/2));
59     }
60 }