set_projection_viewport(3)      Allegro manual      set_projection_viewport(3)



NAME
       set_projection_viewport - Sets the viewport used to scale the output of
       persp_project(). Allegro game programming library.

SYNOPSIS
       #include <allegro.h>


       void set_projection_viewport(int x, int y, int w, int h);

DESCRIPTION
       Sets the viewport used to scale the output of the persp_project()
       function. Pass the dimensions of the screen area you want to draw onto,
       which will typically be 0, 0, SCREEN_W, and SCREEN_H. Also don't forget
       to pass an appropriate aspect ratio to get_camera_matrix later. The
       width and height you specify here will determine how big your viewport
       is in 3d space. So if an object in your 3D space is w units wide, it
       will fill the complete screen when you run into it (i.e., if it has a
       distance of 1.0 after the camera matrix was applied. The fov and
       aspect-ratio parameters to get_camera_matrix also apply some scaling
       though, so this isn't always completely true). If you pass -1/-1/2/2 as
       parameters, no extra scaling will be performed by the projection.


SEE ALSO
       persp_project(3), get_camera_matrix(3), ex3d(3), excamera(3),
       exquat(3), exscn3d(3), exstars(3), exzbuf(3)



Allegro                          version 4.2.3      set_projection_viewport(3)
