Multiple Viewports

Code you cannot change:

view.cpp V_Init():
DO NOT delete:
	CreateNewViewport(MainViewport, 0, 0, 0, 0, false, true, VP_MainViewport);
or:
	pCurrent = pHead;

Add any new viewports you want to always show up on the screen between CreateNewViewport and pCurrent = pHead.


Adding a new viewport:

Open z_viewport.h

Add:

#define YourViewportsName [next_id]
next_id is the next number available for an index.

void VP_YourViewport (struct ref_params_s *pparams, vp_s *vp);

Open z_viewport.cpp

Add:

void VP_YourViewport (struct ref_params_s *pparams, vp_s *vp)
{
	// this block is the only required data
	pparams->viewport[0] = XRES(vp->x);
	pparams->viewport[1] = YRES(vp->y);
	pparams->viewport[2] = XRES(vp->wide);
	pparams->viewport[3] = YRES(vp->tall);
	pparams->onlyClientDraw = vp->clientOnly;
	// add viewport specific code after this
}

You can now create a viewport, anywhere you need it by using (make sure you have z_viewport.h included)

CreateNewViewport( YourViewportsName, x, y, wide, tall, clientOnly, visible, VP_YourViewport );
Do not use XRES or YRES here. It is done in your viewports function. If you decide to change that, you cannot use
XRES or YRES in V_Init. The screen res is not available then.

Getting a pointer to your viewport:

Again, make sure z_viewport.h is included. 

vp_s *pYourViewport = GetVP( YourViewportsName );
if (pYourViewport)
{
	// do stuff to your viewport
}

It is best, if youre going to have a viewport off most of the time to delete it. You can do this by getting a pointer
to your viewport and calling RemoveVP on it. Once you need it again, call CreateNewViewport with the same index
as the viewport you deleted.