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projection.rs
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projection.rs
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use super::DepthCalculation;
use bevy_math::Mat4;
use bevy_property::{Properties, Property};
use serde::{Deserialize, Serialize};
pub trait CameraProjection {
fn get_projection_matrix(&self) -> Mat4;
fn update(&mut self, width: usize, height: usize);
fn depth_calculation(&self) -> DepthCalculation;
}
#[derive(Debug, Clone, Properties)]
pub struct PerspectiveProjection {
pub fov: f32,
pub aspect_ratio: f32,
pub near: f32,
pub far: f32,
}
impl CameraProjection for PerspectiveProjection {
fn get_projection_matrix(&self) -> Mat4 {
Mat4::perspective_rh(self.fov, self.aspect_ratio, self.near, self.far)
}
fn update(&mut self, width: usize, height: usize) {
self.aspect_ratio = width as f32 / height as f32;
}
fn depth_calculation(&self) -> DepthCalculation {
DepthCalculation::Distance
}
}
impl Default for PerspectiveProjection {
fn default() -> Self {
PerspectiveProjection {
fov: std::f32::consts::PI / 4.0,
near: 1.0,
far: 1000.0,
aspect_ratio: 1.0,
}
}
}
// TODO: make this a component instead of a property
#[derive(Debug, Clone, Property, Serialize, Deserialize)]
pub enum WindowOrigin {
Center,
BottomLeft,
}
#[derive(Debug, Clone, Properties)]
pub struct OrthographicProjection {
pub left: f32,
pub right: f32,
pub bottom: f32,
pub top: f32,
pub near: f32,
pub far: f32,
pub window_origin: WindowOrigin,
}
impl CameraProjection for OrthographicProjection {
fn get_projection_matrix(&self) -> Mat4 {
Mat4::orthographic_rh(
self.left,
self.right,
self.bottom,
self.top,
self.near,
self.far,
)
}
fn update(&mut self, width: usize, height: usize) {
match self.window_origin {
WindowOrigin::Center => {
let half_width = width as f32 / 2.0;
let half_height = height as f32 / 2.0;
self.left = -half_width;
self.right = half_width;
self.top = half_height;
self.bottom = -half_height;
}
WindowOrigin::BottomLeft => {
self.left = 0.0;
self.right = width as f32;
self.top = height as f32;
self.bottom = 0.0;
}
}
}
fn depth_calculation(&self) -> DepthCalculation {
DepthCalculation::ZDifference
}
}
impl Default for OrthographicProjection {
fn default() -> Self {
OrthographicProjection {
left: 0.0,
right: 0.0,
bottom: 0.0,
top: 0.0,
near: 0.0,
far: 1000.0,
window_origin: WindowOrigin::Center,
}
}
}