54 lines
1.4 KiB
Rust
54 lines
1.4 KiB
Rust
use glam::{Mat4, Vec3, Vec4};
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use std::ops::Mul;
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/// A 2D transformation matrix.
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#[derive(Debug, Clone, Copy, PartialEq)]
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pub struct Transformation(Mat4);
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impl Transformation {
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/// Get the identity transformation.
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pub fn identity() -> Transformation {
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Transformation(Mat4::identity())
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}
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/// Creates an orthographic projection.
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#[rustfmt::skip]
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pub fn orthographic(width: u32, height: u32) -> Transformation {
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Transformation(Mat4::from_cols(
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Vec4::new(2.0 / width as f32, 0.0, 0.0, 0.0),
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Vec4::new(0.0, -2.0 / height as f32, 0.0, 0.0),
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Vec4::new(0.0, 0.0, -1.0, 0.0),
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Vec4::new(-1.0, 1.0, 0.0, 1.0)
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))
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}
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/// Creates a translate transformation.
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pub fn translate(x: f32, y: f32) -> Transformation {
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Transformation(Mat4::from_translation(Vec3::new(x, y, 0.0)))
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}
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/// Creates a scale transformation.
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pub fn scale(x: f32, y: f32) -> Transformation {
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Transformation(Mat4::from_scale(Vec3::new(x, y, 1.0)))
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}
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}
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impl Mul for Transformation {
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type Output = Self;
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fn mul(self, rhs: Self) -> Self {
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Transformation(self.0 * rhs.0)
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}
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}
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impl AsRef<[f32; 16]> for Transformation {
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fn as_ref(&self) -> &[f32; 16] {
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self.0.as_ref()
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}
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}
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impl From<Transformation> for [f32; 16] {
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fn from(t: Transformation) -> [f32; 16] {
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*t.as_ref()
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}
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}
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