dagon.ui.firstpersonview source code

1 /*
2 Copyright (c) 2017-2020 Timur Gafarov
3 
4 Boost Software License - Version 1.0 - August 17th, 2003
5 Permission is hereby granted, free of charge, to any person or organization
6 obtaining a copy of the software and accompanying documentation covered by
7 this license (the "Software") to use, reproduce, display, distribute,
8 execute, and transmit the Software, and to prepare derivative works of the
9 Software, and to permit third-parties to whom the Software is furnished to
10 do so, all subject to the following:
11 
12 The copyright notices in the Software and this entire statement, including
13 the above license grant, this restriction and the following disclaimer,
14 must be included in all copies of the Software, in whole or in part, and
15 all derivative works of the Software, unless such copies or derivative
16 works are solely in the form of machine-executable object code generated by
17 a source language processor.
18 
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
22 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
23 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
24 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 DEALINGS IN THE SOFTWARE.
26 */
27 
28 module dagon.ui.firstpersonview;
29 
30 import std.math;
31 
32 import dlib.math.vector;
33 import dlib.math.matrix;
34 import dlib.math.quaternion;
35 import dlib.math.transformation;
36 import dlib.math.utils;
37 
38 import dagon.core.event;
39 import dagon.core.keycodes;
40 import dagon.core.time;
41 import dagon.graphics.entity;
42 
43 class FirstPersonViewComponent: EntityComponent
44 {
45     int prevMouseX = 0;
46     int prevMouseY = 0;
47     
48     float pitch = 0.0f;
49     float turn = 0.0f;
50 
51     float mouseSensibility = 0.1f;
52     float axisSensibility = 20.0f;
53     
54     bool active = true;
55     bool mouseActive = true;
56     
57     float pitchLimitMax = 60.0f;
58     float pitchLimitMin = -60.0f;
59     
60     this(EventManager em, Entity e)
61     {
62         super(em, e);
63         reset();
64     }
65     
66     void reset()
67     {
68         pitch = 0.0f;
69         turn = 0.0f;
70         eventManager.setMouseToCenter();
71         prevMouseX = eventManager.mouseX;
72         prevMouseY = eventManager.mouseY;
73     }
74     
75     override void update(Time time)
76     {
77         processEvents();
78         
79         if (active & mouseActive)
80         {
81             float mouseRelH =  (eventManager.mouseX - prevMouseX) * mouseSensibility;
82             float mouseRelV = (eventManager.mouseY - prevMouseY) * mouseSensibility;
83             float axisV = inputManager.getAxis("vertical") * axisSensibility * mouseSensibility;
84             float axisH = inputManager.getAxis("horizontal") * axisSensibility * mouseSensibility;
85             pitch -= mouseRelV + axisV;
86             turn -= mouseRelH + axisH;
87             
88             if (pitch > pitchLimitMax)
89             {
90                 pitch = pitchLimitMax;
91             }
92             else if (pitch < pitchLimitMin)
93             {
94                 pitch = pitchLimitMin;
95             }
96             
97             eventManager.setMouse(prevMouseX, prevMouseY);
98         }
99         
100         auto rotPitch = rotationQuaternion(Vector3f(1.0f,0.0f,0.0f), degtorad(pitch));
101         auto rotTurn = rotationQuaternion(Vector3f(0.0f,1.0f,0.0f), degtorad(turn));
102         
103         Quaternionf q = rotTurn * rotPitch;
104         
105         entity.transformation =
106             translationMatrix(entity.position) *
107             q.toMatrix4x4 *
108             scaleMatrix(entity.scaling);
109         
110         entity.invTransformation = entity.transformation.inverse;
111         
112         if (entity.parent)
113         {
114             entity.absoluteTransformation = entity.parent.absoluteTransformation * entity.transformation;
115             entity.invAbsoluteTransformation = entity.invTransformation * entity.parent.invAbsoluteTransformation;
116             entity.prevAbsoluteTransformation = entity.parent.prevAbsoluteTransformation * entity.prevTransformation;
117         }
118         else
119         {
120             entity.absoluteTransformation = entity.transformation;
121             entity.invAbsoluteTransformation = entity.invTransformation;
122             entity.prevAbsoluteTransformation = entity.prevTransformation;
123         }
124     }
125     
126     override void onResize(int width, int height)
127     {
128         prevMouseX = width / 2;
129         prevMouseY = height / 2;
130     }
131     
132     override void onFocusGain()
133     {
134         mouseActive = true;
135     }
136     
137     override void onFocusLoss()
138     {
139         mouseActive = false;
140     }
141     
142     void moveForward(float speed)
143     {
144         Vector3f forward = entity.transformation.forward;
145         entity.position -= forward.normalized * speed;
146     }
147     
148     void moveBack(float speed)
149     {
150         Vector3f forward = entity.transformation.forward;
151         entity.position += forward.normalized * speed;
152     }
153     
154     void strafeRight(float speed)
155     {
156         Vector3f right = entity.transformation.right;
157         entity.position += right.normalized * speed;
158     }
159     
160     void strafeLeft(float speed)
161     {
162         Vector3f right = entity.transformation.right;
163         entity.position -= right.normalized * speed;
164     }
165 }