Graphmath.Mat44.make_rotate_x

You're seeing just the function make_rotate_x, go back to Graphmath.Mat44 module for more information.
Link to this function

make_rotate_x(theta)

Specs

make_rotate_x(float()) :: mat44()

make_rotate_x( theta ) creates a mat44 that rotates a vec3 by theta radians about the +X axis.

theta is the float of the number of radians of rotation the matrix will provide.

This returns a mat44 which rotates by theta radians about the +X axis.