Function frustum 

pub fn frustum(
    left: f64,
    right: f64,
    bottom: f64,
    top: f64,
    near: f64,
    far: f64,
) -> DMat4

Creates a perspective projection matrix from a frustum for use with OpenGL.

Expects a right-handed Y-up view space input. Outputs NDC with Z in [-1, 1] and Y-up.

This is the OpenGL glFrustum equivalent. See https://registry.khronos.org/OpenGL-Refpages/gl2.1/xhtml/glFrustum.xml

Panics

Will panic if near or far are less than or equal to zero when glam_assert is enabled.