Projects a 3d point into 2d screen space.
Projects the 3d point (x, y, z) into 2d screen space, storing the result
in (*xout, *yout) and using the scaling parameters previously set by
calling set_projection_viewport(). This function projects from the
normalized viewing pyramid, which has a camera at the origin and facing
along the positive z axis. The x axis runs left/right, y runs up/down,
and z increases with depth into the screen. The camera has a 90 degree
field of view, ie. points on the planes x=z and -x=z will map onto the
left and right edges of the screen, and the planes y=z and -y=z map to
the top and bottom of the screen. If you want a different field of view
or camera location, you should transform all your objects with an
appropriate viewing matrix, eg. to get the effect of panning the camera
10 degrees to the left, rotate all your objects 10 degrees to the right.
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