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use crate::matrix::Matrix;
#[derive(Debug)]
#[non_exhaustive]
pub enum Projection
{
Perspective(Perspective),
}
/// Perspective projection parameters.
#[derive(Debug)]
pub struct Perspective
{
pub fov_radians: f32,
pub far: f32,
pub near: f32,
}
impl Default for Perspective
{
fn default() -> Self
{
Self {
fov_radians: 80.0f32.to_radians(),
far: 100.0,
near: 0.1,
}
}
}
pub(crate) fn new_perspective_matrix(
perspective: &Perspective,
aspect: f32,
) -> Matrix<f32, 4, 4>
{
let mut out = Matrix::new();
out.set_cell(0, 0, (1.0 / (perspective.fov_radians / 2.0).tan()) / aspect);
out.set_cell(1, 1, 1.0 / (perspective.fov_radians / 2.0).tan());
out.set_cell(
2,
2,
(perspective.near + perspective.far) / (perspective.near - perspective.far),
);
out.set_cell(
2,
3,
(2.0 * perspective.near * perspective.far) / (perspective.near - perspective.far),
);
out.set_cell(3, 2, -1.0);
out
}
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