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Implemented rotations

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This commit is contained in:
Lorenzo Torres 2025-08-06 16:35:29 +02:00
parent 7a634d53b5
commit defdf051ec
6 changed files with 29 additions and 13 deletions
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14
src/math.zig
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@ -11,18 +11,21 @@ pub const Axis = struct {
pub const z: [3]f32 = .{0.0, 0.0, 1.0};
};
pub const Transform = struct {
pub const Transform = extern struct {
translation: Matrix,
scale: Matrix,
rotation_matrix: Matrix,
rotation: Quaternion,
pub fn init(position: [3]f32, scale: [3]f32, rotation: [3]f32) Transform {
var translation = Matrix.identity();
translation.translate(position);
const quaternion = Quaternion.fromEulerAngles(rotation);
return .{
.translation = translation,
.rotation = Quaternion.fromEulerAngles(rotation),
.rotation = quaternion,
.rotation_matrix = quaternion.matrix(),
.scale = Matrix.scale(scale),
};
}
@ -35,10 +38,11 @@ pub const Transform = struct {
const delta = Quaternion.fromAxisAngle(axis, angle);
self.rotation = self.rotation.mul(delta);
self.rotation = self.rotation.normalize();
self.rotation_matrix = self.rotation.matrix();
}
};
pub const Matrix = struct {
pub const Matrix = extern struct {
rows: [4][4]f32,
pub fn lookAt(eye: [3]f32, target: [3]f32, arbitrary_up: [3]f32) Matrix {
@ -134,7 +138,7 @@ pub const Matrix = struct {
}
};
const Quaternion = struct {
pub const Quaternion = extern struct {
w: f32,
x: f32,
y: f32,
@ -150,7 +154,7 @@ const Quaternion = struct {
.w = cos(half_angle),
.x = axis[0] * s,
.y = axis[1] * s,
.z = axis[3] * s,
.z = axis[2] * s,
};
}