128 lines
3.2 KiB
Rust
128 lines
3.2 KiB
Rust
use crate::math::{ Vec3 };
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#[repr(C)]
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#[derive(Clone, Copy, Debug)]
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pub struct Mat4 {
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pub data: [f32; 16],
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}
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impl Mat4 {
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pub fn identity() -> Self {
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Self {
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data: [
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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, 1.0, 0.0,
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0.0, 0.0, 0.0, 1.0,
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],
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}
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}
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pub fn translation(x: f32, y: f32, z: f32) -> Self {
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Self {
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data: [
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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, 1.0, 0.0,
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x, y, z, 1.0,
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],
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}
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}
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pub fn scale(x: f32, y: f32, z: f32) -> Self {
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Self {
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data: [
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x, 0.0, 0.0, 0.0,
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0.0, y, 0.0, 0.0,
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0.0, 0.0, z, 0.0,
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0.0, 0.0, 0.0, 1.0,
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],
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}
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}
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pub fn rotation_x(angle: f32) -> Self {
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let c = angle.cos();
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let s = angle.sin();
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Self {
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data: [
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1.0, 0.0, 0.0, 0.0,
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0.0, c, s, 0.0,
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0.0, -s, c, 0.0,
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0.0, 0.0, 0.0, 1.0,
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],
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}
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}
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pub fn rotation_y(angle: f32) -> Self {
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let c = angle.cos();
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let s = angle.sin();
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Self {
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data: [
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c, 0.0, -s, 0.0,
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0.0, 1.0, 0.0, 0.0,
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s, 0.0, c, 0.0,
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0.0, 0.0, 0.0, 1.0,
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],
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}
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}
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pub fn rotation_z(angle: f32) -> Self {
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let c = angle.cos();
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let s = angle.sin();
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Self {
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data: [
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c, s, 0.0, 0.0,
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-s, c, 0.0, 0.0,
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0.0, 0.0, 1.0, 0.0,
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0.0, 0.0, 0.0, 1.0,
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],
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}
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}
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pub fn perspective(fov: f32, aspect: f32, near: f32, far: f32) -> Self {
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let f = 1.0 / (fov / 2.0).tan();
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let nf = 1.0 / (near - far);
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Self {
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data: [
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f / aspect, 0.0, 0.0, 0.0,
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0.0, f, 0.0, 0.0,
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0.0, 0.0, (far + near) * nf, -1.0,
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0.0, 0.0, 2.0 * far * near * nf, 0.0,
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],
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}
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}
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pub fn look_at(eye: Vec3, target: Vec3, up: Vec3) -> Self {
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let f = (target - eye).normalize();
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let r = f.cross(&up).normalize();
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let u = r.cross(&f);
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Self {
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data: [
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r.x, u.x, -f.x, 0.0,
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r.y, u.y, -f.y, 0.0,
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r.z, u.z, -f.z, 0.0,
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-r.dot(&eye), -u.dot(&eye), f.dot(&eye), 1.0,
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],
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}
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}
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pub fn as_ptr(&self) -> *const f32 {
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self.data.as_ptr()
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}
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}
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impl std::ops::Mul for Mat4 {
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type Output = Self;
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fn mul(self, rhs: Self) -> Self {
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let mut result = [0.0f32; 16];
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for row in 0..4 {
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for col in 0..4 {
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for k in 0..4 {
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result[col * 4 + row] += self.data[k * 4 + row] * rhs.data[col * 4 + k];
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}
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}
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}
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Self { data: result }
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}
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}
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