Function gl_utils::camera2d::screen_2d_to_ndc_2d

pub fn screen_2d_to_ndc_2d(
    screen_dimensions: Vector2<u16>, 
    screen_coord: Point2<i16>
) -> Point2<f32>

Convert screen coordinate to OpenGL NDC based on a given screen resolution.

Examples

assert_eq!(
  screen_2d_to_ndc_2d (cgmath::vec2 (640, 480), (320, 240).into()),
  (0.0, 0.0).into()
);
assert_relative_eq!(
  screen_2d_to_ndc_2d (cgmath::vec2 (640, 480), (480, 264).into()),
  (0.5, 0.1).into()
);
assert_eq!(
  screen_2d_to_ndc_2d (cgmath::vec2 (640, 480), (0, 0).into()),
  (-1.0, -1.0).into()
);
assert_eq!(
  screen_2d_to_ndc_2d (cgmath::vec2 (640, 480), (0, 480).into()),
  (-1.0, 1.0).into()
);
assert_eq!(
  screen_2d_to_ndc_2d (cgmath::vec2 (640, 480), (640, 0).into()),
  (1.0, -1.0).into()
);
assert_eq!(
  screen_2d_to_ndc_2d (cgmath::vec2 (640, 480), (640, 480).into()),
  (1.0, 1.0).into()
);