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Added camera uniforms for projection and view matrix

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This commit is contained in:
Lorenzo Torres 2025-08-04 17:23:00 +02:00
parent 59e3997056
commit dcb2ee0584
7 changed files with 92 additions and 28 deletions
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28
src/math.zig
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@ -8,15 +8,15 @@ pub const Matrix = struct {
rows: [4]@Vector(4, f32),
pub fn lookAt(eye: @Vector(3, f32), target: @Vector(3, f32), arbitrary_up: @Vector(3, f32)) Matrix {
const forward = normalize(eye - target);
const right = normalize(cross(arbitrary_up, forward));
const up = cross(forward, right);
const forward = normalize(target - eye);
const right = normalize(cross(forward, arbitrary_up));
const up = cross(right, forward);
const view = [_]@Vector(4, f32){
@Vector(4, f32){ right[0], right[1], right[2], 0.0 },
@Vector(4, f32){ up[0], up[1], up[2], 0.0 },
@Vector(4, f32){ forward[0], forward[1], forward[2], 0.0 },
@Vector(4, f32){ 0.0, 0.0, 1.0, eye[2] },
@Vector(4, f32){ right[0], up[0], -forward[0], 0.0 },
@Vector(4, f32){ right[1], up[1], -forward[1], 0.0 },
@Vector(4, f32){ right[2], up[2], -forward[2], 0.0 },
@Vector(4, f32){ -dot(eye, right), -dot(eye, up), -dot(eye, forward), 1.0 },
};
return Matrix{
@ -25,11 +25,17 @@ pub const Matrix = struct {
}
pub fn perspective(fov: f32, aspect: f32, near: f32, far: f32) Matrix {
const focal_length = 1.0 / tan(fov / 2.0);
const x = focal_length / aspect;
const y = -focal_length;
const a = near / (far - near);
const b = far * a;
const projection = [_]@Vector(4, f32){
@Vector(4, f32){ 1.0 / (aspect * tan(fov / 2.0)), 0.0, 0.0, 0.0 },
@Vector(4, f32){ 0.0, 1.0 / tan(fov / 2.0), 0.0, 0.0 },
@Vector(4, f32){ 0.0, 0.0, -((far + near) / (far - near)), -((2 * far * near) / (far - near)) },
@Vector(4, f32){ 0.0, 0.0, -1.0, 1.0 },
@Vector(4, f32){ x, 0.0, 0.0, 0.0 },
@Vector(4, f32){ 0.0, y, 0.0, 0.0 },
@Vector(4, f32){ 0.0, 0.0, a, b },
@Vector(4, f32){ 0.0, 0.0, 1.0, 0.0 },
};
return Matrix{