2023-05-22 16:18:35 +00:00
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use cgmath::{Vector3, Point3, InnerSpace, Deg, Rad, Matrix4};
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use crate::{input::Input, player::Player};
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2023-05-13 09:41:36 +00:00
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#[derive(Debug)]
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pub struct Camera {
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pub position: Option<Point3<f32>>,
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pub target: Option<Point3<f32>>,
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2023-05-15 08:28:40 +00:00
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pub rot_y: Deg<f32>,
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aspect: f32,
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fovy: Deg<f32>,
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znear: f32,
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zfar: f32,
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}
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2023-05-22 16:18:35 +00:00
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fn pitch_clamp(pitch: f32) -> Deg<f32> {
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const PITCH_LIM: f32 = 90.0 - (0.0001 * 10.0);
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return Deg(pitch.clamp(-PITCH_LIM, PITCH_LIM));
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}
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impl Camera {
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pub fn new(
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dimensions: winit::dpi::PhysicalSize<u32>,
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rot_y: Deg<f32>,
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) -> Self {
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return Self {
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position: None,
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target: None,
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rot_y: pitch_clamp(rot_y.0),
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aspect: dimensions.width as f32 / dimensions.height as f32,
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fovy: Deg(40.0),
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znear: 0.1,
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zfar: 100.0,
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};
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}
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pub fn reconfigure(&mut self, dimensions: winit::dpi::PhysicalSize<u32>) {
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self.aspect = dimensions.width as f32 / dimensions.height as f32;
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return;
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}
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pub fn update_pos(&mut self, player: &Player) {
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let mut target = player.position + (player.forward_right().1 * (0.1 /* player half width */ + 0.05 /* additional offset */));
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target.y += 0.25; // player half height
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let (sin_yaw, cos_yaw) = Rad::from(player.rot_x).0.sin_cos();
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let (sin_pitch, cos_pitch) = Rad::from(self.rot_y).0.sin_cos();
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let v = Vector3::new(
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cos_pitch * cos_yaw,
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sin_pitch,
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cos_pitch * sin_yaw
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).normalize();
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self.position = Some(target - v);
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self.target = Some(target);
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return;
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2023-05-15 13:45:55 +00:00
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}
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2023-05-15 19:21:01 +00:00
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pub fn update_rot(&mut self, input: &Input, sf: f32) {
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// doesn't need dt because the input is not continuous.
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let (_, dy) = input.mouse_moved;
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self.rot_y = pitch_clamp(self.rot_y.0 + ((-dy / input.dots_per_deg) * sf));
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return;
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}
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}
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pub struct CameraUniform {
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buffer: wgpu::Buffer,
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}
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impl<'a> CameraUniform {
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const OPENGL_TO_WGPU_MATRIX: cgmath::Matrix4<f32> = cgmath::Matrix4::new(
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1.0, 0.0, 0.0, 0.0,
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0.0, 1.0, 0.0, 0.0,
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0.0, 0.0, 0.5, 0.0,
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0.0, 0.0, 0.5, 1.0,
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);
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const SIZE: usize = std::mem::size_of::<[[f32; 4]; 4]>();
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pub fn new(device: &wgpu::Device) -> Self {
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return Self {
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buffer: device.create_buffer(
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&(wgpu::BufferDescriptor {
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label: Some("Camera Buffer"),
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usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
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size: Self::SIZE as u64,
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mapped_at_creation: false,
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})
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),
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};
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}
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pub fn set_view_projection_matrix(&self, queue: &wgpu::Queue, camera: &Camera) {
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/*let (sin_yaw, cos_yaw) = Rad::from(camera.rot.x).0.sin_cos();
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let (sin_pitch, cos_pitch) = Rad::from(camera.rot.y).0.sin_cos();
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let target = Vector3::new(
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cos_pitch * cos_yaw,
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sin_pitch,
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cos_pitch * sin_yaw
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).normalize();*/
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let view = Matrix4::look_to_rh(camera.position.unwrap(), camera.target.unwrap() - camera.position.unwrap(), Vector3::unit_y());
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let proj = cgmath::perspective(camera.fovy, camera.aspect, camera.znear, camera.zfar);
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let transformed_proj: [[f32; 4]; 4] = (Self::OPENGL_TO_WGPU_MATRIX * proj * view).into();
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queue.write_buffer(&(self.buffer), 0, bytemuck::cast_slice(&(transformed_proj)));
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return;
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}
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pub fn as_entire_binding(&self) -> wgpu::BindingResource {
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return self.buffer.as_entire_binding();
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}
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}
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