support/camera.rs

   1 extern crate glutin;
   2
   3 use glutin::ElementState::{Pressed, Released};
   4 use glutin::Event::{KeyboardInput, MouseMoved};
   5 use glutin::VirtualKeyCode;
   6 use support::vec3::Vec3;
   7 use support::vec3::norm;
   8
   9 use std::f32;
  10
  11 //use glutin::Event;
  12 //use VirtualKeyCode;
  13
  14 #[derive(Default)]
  15 pub struct CameraState {
  16     aspect_ratio: f32,
  17     pos: Vec3,
  18     dir: Vec3,
  19
  20     moving_up: bool,
  21     moving_left: bool,
  22     moving_down: bool,
  23     moving_right: bool,
  24     moving_forward: bool,
  25     moving_backward: bool,
  26     turning_up: bool,
  27     turning_left: bool,
  28     turning_down: bool,
  29     turning_right: bool,
  30
  31     mouse_x: i32,
  32     mouse_y: i32,
  33     rel_x: i32,
  34     rel_y: i32,
  35 }
  36
  37 impl CameraState {
  38     pub fn new() -> CameraState {
  39         CameraState {
  40             aspect_ratio: 1024.0 / 768.0,
  41             pos: Vec3(0.0, 0.0, 0.0),
  42             dir: Vec3(0.0, 0.0, -1.0),
  43             .. Default::default()
  44         }
  45     }
  46
  47     pub fn set_pos(&mut self, pos: Vec3) {
  48         self.pos = pos;
  49     }
  50
  51     pub fn get_pos(&self) -> Vec3 {
  52         self.pos
  53     }
  54
  55     pub fn set_dir(&mut self, dir: Vec3) {
  56         self.dir = dir;
  57     }
  58
  59     pub fn get_perspective(&self) -> [[f32; 4]; 4] {
  60         let fov: f32 = 3.141592 / 2.0;
  61         let zfar = 1024.0;
  62         let znear = 0.1;
  63
  64         let f = 1.0 / (fov / 2.0).tan();
  65
  66         // note: remember that this is column-major, so the lines of code are actually columns
  67         [
  68             [f / self.aspect_ratio,    0.0,              0.0              ,   0.0],
  69             [         0.0         ,     f ,              0.0              ,   0.0],
  70             [         0.0         ,    0.0,  (zfar+znear)/(zfar-znear)    ,   1.0],
  71             [         0.0         ,    0.0, -(2.0*zfar*znear)/(zfar-znear),   0.0],
  72         ]
  73     }
  74
  75     pub fn get_view(&self) -> [[f32; 4]; 4] {
  76         let f = norm(&self.dir);
  77
  78         let up = Vec3(0.0, 1.0, 0.0);
  79
  80         let s = Vec3(f.1 * up.2 - f.2 * up.1,
  81                      f.2 * up.0 - f.0 * up.2,
  82                      f.0 * up.1 - f.1 * up.0);
  83         let sn = norm(&s);
  84
  85         let u = (sn.1 * f.2 - sn.2 * f.1,
  86                  sn.2 * f.0 - sn.0 * f.2,
  87                  sn.0 * f.1 - sn.1 * f.0);
  88
  89         let p = (-self.pos.0 * s.0 - self.pos.1 * s.1 - self.pos.2 * s.2,
  90                  -self.pos.0 * u.0 - self.pos.1 * u.1 - self.pos.2 * u.2,
  91                  -self.pos.0 * f.0 - self.pos.1 * f.1 - self.pos.2 * f.2);
  92
  93         // note: remember that this is column-major, so the lines of code are actually columns
  94         [
  95             [sn.0, u.0, f.0, 0.0],
  96             [sn.1, u.1, f.1, 0.0],
  97             [sn.2, u.2, f.2, 0.0],
  98             [p.0,  p.1, p.2, 1.0],
  99         ]
 100     }
 101
 102     pub fn update(&mut self) {
 103         let f = norm(&self.dir);
 104
 105         let up = Vec3(0.0, 1.0, 0.0);
 106
 107         let s = Vec3(f.1 * up.2 - f.2 * up.1,
 108                      f.2 * up.0 - f.0 * up.2,
 109                      f.0 * up.1 - f.1 * up.0);
 110
 111         let s = norm(&s);
 112
 113         let u = Vec3(s.1 * f.2 - s.2 * f.1,
 114                      s.2 * f.0 - s.0 * f.2,
 115                      s.0 * f.1 - s.1 * f.0);
 116
 117         let walk_speed = 0.01;
 118         let strife_speed = 0.02;
 119         let pan_speed = 0.01;
 120
 121         if self.moving_up {
 122             self.pos += u * strife_speed;
 123         }
 124         if self.moving_down {
 125             self.pos -= u * strife_speed;
 126         }
 127         if self.moving_left {
 128             self.pos -= s * strife_speed;
 129         }
 130         if self.moving_right {
 131             self.pos += s * strife_speed;
 132         }
 133         if self.moving_forward {
 134             self.pos += f * walk_speed;
 135         }
 136         if self.moving_backward {
 137             self.pos -= f * walk_speed;
 138         }
 139
 140         if self.turning_left { self.rel_x -= 2; }
 141         if self.turning_right { self.rel_x += 2; }
 142         if self.turning_up { self.rel_y -= 2; }
 143         if self.turning_down { self.rel_y += 2; }
 144         let vx = -pan_speed * self.rel_x as f32;
 145         let vy = -pan_speed * self.rel_y as f32;
 146         self.dir = Vec3(f.0 * vx.cos() + f.2 * vx.sin(),
 147                         f.1 * vy.cos() - f.2 * vy.sin(),
 148                         f.1 * vy.sin() - f.0 * vx.sin() + f.2 * vx.cos() * vy.cos());
 149         self.rel_x = 0;
 150         self.rel_y = 0;
 151
 152         //println!("camera_pos = {:?}", self.pos);
 153         //println!("camera_dir = {:?}", self.dir);
 154     }
 155
 156     pub fn process_input(&mut self, event: &glutin::Event) {
 157         match event {
 158             &MouseMoved(x, y) => {
 159                 self.rel_x += x - self.mouse_x;
 160                 self.rel_y += y - self.mouse_y;
 161                 self.mouse_x = x;
 162                 self.mouse_y = y;
 163             }
 164             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::Up)) => {
 165                 self.moving_up = true;
 166             },
 167             &KeyboardInput(Released, _, Some(VirtualKeyCode::Up)) => {
 168                 self.moving_up = false;
 169             },
 170             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::Down)) => {
 171                 self.moving_down = true;
 172             },
 173             &KeyboardInput(Released, _, Some(VirtualKeyCode::Down)) => {
 174                 self.moving_down = false;
 175             },
 176             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::Left)) => {
 177                 self.moving_left = true;
 178             },
 179             &KeyboardInput(Released, _, Some(VirtualKeyCode::Left)) => {
 180                 self.moving_left = false;
 181             },
 182             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::Right)) => {
 183                 self.moving_right = true;
 184             },
 185             &KeyboardInput(Released, _, Some(VirtualKeyCode::Right)) => {
 186                 self.moving_right = false;
 187             },
 188             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::A)) => {
 189                 self.turning_left = true;
 190             },
 191             &KeyboardInput(Released, _, Some(VirtualKeyCode::A)) => {
 192                 self.turning_left = false;
 193             },
 194             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::D)) => {
 195                 self.turning_right = true;
 196             },
 197             &KeyboardInput(Released, _, Some(VirtualKeyCode::D)) => {
 198                 self.turning_right = false;
 199             },
 200             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::W)) => {
 201                 self.moving_forward = true;
 202             },
 203             &KeyboardInput(Released, _, Some(VirtualKeyCode::W)) => {
 204                 self.moving_forward = false;
 205             },
 206             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::S)) => {
 207                 self.moving_backward = true;
 208             },
 209             &KeyboardInput(Released, _, Some(VirtualKeyCode::S)) => {
 210                 self.moving_backward = false;
 211             },
 212             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::R)) => {
 213                 self.turning_up = true;
 214             },
 215             &KeyboardInput(Released, _, Some(VirtualKeyCode::R)) => {
 216                 self.turning_up = false;
 217             },
 218             &KeyboardInput(Pressed, _, Some(VirtualKeyCode::F)) => {
 219                 self.turning_down = true;
 220             },
 221             &KeyboardInput(Released, _, Some(VirtualKeyCode::F)) => {
 222                 self.turning_down = false;
 223             },
 224             _ => {}
 225         }
 226     }
 227 }