Function mat4_look_at

native/shared/src/renderer/util.rs:49–72

(eye: [f32; 3], center: [f32; 3], up: [f32; 3])

}

pub fn mat4_look_at(eye: [f32; 3], center: [f32; 3], up: [f32; 3]) -> [[f32; 4]; 4] {
    let fx = center[0] - eye[0];
    let fy = center[1] - eye[1];
    let fz = center[2] - eye[2];
    let flen = (fx*fx + fy*fy + fz*fz).sqrt();
    let (fx, fy, fz) = (fx/flen, fy/flen, fz/flen);

    let sx = fy * up[2] - fz * up[1];
    let sy = fz * up[0] - fx * up[2];
    let sz = fx * up[1] - fy * up[0];
    let slen = (sx*sx + sy*sy + sz*sz).sqrt();
    let (sx, sy, sz) = (sx/slen, sy/slen, sz/slen);

    let ux = sy * fz - sz * fy;
    let uy = sz * fx - sx * fz;
    let uz = sx * fy - sy * fx;

    [
        [sx, ux, -fx, 0.0],
        [sy, uy, -fy, 0.0],
        [sz, uz, -fz, 0.0],
        [-(sx*eye[0]+sy*eye[1]+sz*eye[2]), -(ux*eye[0]+uy*eye[1]+uz*eye[2]), fx*eye[0]+fy*eye[1]+fz*eye[2], 1.0],
    ]
}

pub fn mat4_multiply(a: [[f32; 4]; 4], b: [[f32; 4]; 4]) -> [[f32; 4]; 4] {
    let mut out = [[0.0f32; 4]; 4];