extern crate nalgebra as na;
extern crate nalgebra_glm as glm;

use na::Perspective3;
use na::Orthographic3;
use glm::Mat4;
use glm::Vec4;

#[test]
pub fn orthographic_glm_nalgebra_same()
{
    let na_mat : Mat4 = Orthographic3::new(-100.0f32,100.0f32, -50.0f32, 50.0f32, 0.1f32, 100.0f32).unwrap();
    let gl_mat : Mat4 = glm::ortho_rh_no(-100.0f32,100.0f32, -50.0f32, 50.0f32, 0.1f32, 100.0f32);

    // ortho_rh_no is the same as the standard nalgebra orthographic matrix
    //
    // we cant use plain ortho here as the library could be configured to produce different values

    assert_eq!(na_mat, gl_mat);
}

#[test]
pub fn perspective_glm_nalgebra_same()
{
    let na_mat : Mat4 = Perspective3::new(16.0f32/9.0f32, 3.14f32/2.0f32, 0.1f32, 100.0f32).unwrap();
    let gl_mat : Mat4 = glm::perspective_rh_no(16.0f32/9.0f32, 3.14f32/2.0f32, 0.1f32, 100.0f32);

    // perspective_rh_no is the same as the standard nalgebra perspective matrix
    //
    // we cant use plain perspective here as the library could be configured to produce different
    // values

    assert_eq!(na_mat, gl_mat);
}

#[test]
pub fn orthographic_glm_nalgebra_project_same()
{
    let point = Vec4::new(1.0,0.0,-20.0,1.0);

    let na_mat : Mat4 = Orthographic3::new(-100.0f32,100.0f32, -50.0f32, 50.0f32, 0.1f32, 100.0f32).unwrap();
    let gl_mat : Mat4 = glm::ortho_rh_no(-100.0f32,100.0f32, -50.0f32, 50.0f32, 0.1f32, 100.0f32);

    // ortho_rh_no is the same as the standard nalgebra orthographic matrix
    //
    // we cant use plain ortho here as the library could be configured to produce different values

    let na_pt = na_mat * point;
    let gl_pt = gl_mat * point;

    assert_eq!(na_pt, gl_pt);
}

#[test]
pub fn perspective_glm_nalgebra_project_same()
{
    let point = Vec4::new(1.0,0.0,-20.0,1.0);

    let na_mat : Mat4 = Perspective3::new(16.0f32/9.0f32, 3.14f32/2.0f32, 0.1f32, 100.0f32).unwrap();
    let gl_mat : Mat4 = glm::perspective_rh_no(16.0f32/9.0f32, 3.14f32/2.0f32, 0.1f32, 100.0f32);

    // perspective_rh_no is the same as the standard nalgebra perspective matrix
    //
    // we cant use plain perspective here as the library could be configured to produce different
    // values

    let na_pt = na_mat * point;
    let gl_pt = gl_mat * point;

    assert_eq!(na_pt, gl_pt);
}