glm::ortho(xmin, xmax, ymin, ymax);
glm::ortho(xmin, xmax, ymin, ymax, zmin, zmax);



glm::mat4 mProjectionMatrix = glm::ortho(xmin, xmax, ymin, ymax)

Specifies a logical 2D coordinate system which is to be mapped into the window positions indicated.  Often one matches the coordinates to match the size of the window being rendered to.

In the template glm::ortho is used for 2D rendering of text.

High