/*****************************************************************************
The Dark Mod GPL Source Code

This file is part of the The Dark Mod Source Code, originally based
on the Doom 3 GPL Source Code as published in 2011.

The Dark Mod Source Code is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version. For details, see LICENSE.TXT.

Project: The Dark Mod (http://www.thedarkmod.com/)

******************************************************************************/

#include "precompiled.h"
#pragma hdrstop



#include "dmap.h"

int		c_glfaces;

int PortalVisibleSides( uPortal_t *p )
{
	int		fcon, bcon;

	if (!p->onnode)
		return 0;		// outside

	fcon = p->nodes[0]->opaque;
	bcon = p->nodes[1]->opaque;

	// same contents never create a face
	if (fcon == bcon)
		return 0;

	if (!fcon)
		return 1;
	if (!bcon)
		return 2;
	return 0;
}

void OutputWinding( idWinding *w, idFile *glview )
{
	static	int	level = 128;
	float		light;
	int			i;

	glview->WriteFloatString( "%i\n", w->GetNumPoints() );
	level += 28;
	light = (level&255)/255.0;
	for ( i = 0; i < w->GetNumPoints(); i++ ) {
		glview->WriteFloatString( "%6.3f %6.3f %6.3f %6.3f %6.3f %6.3f\n",
			(*w)[i][0],
			(*w)[i][1],
			(*w)[i][2],
			light,
			light,
			light );
	}
	glview->WriteFloatString( "\n" );
}

/*
=============
OutputPortal
=============
*/
void OutputPortal( uPortal_t *p, idFile *glview ) {
	idWinding	*w;
	int		sides;

	sides = PortalVisibleSides( p );
	if ( !sides ) {
		return;
	}

	c_glfaces++;

	w = p->winding;

	if ( sides == 2 ) {		// back side
		w = w->Reverse();
	}

	OutputWinding( w, glview );

	if ( sides == 2 ) {
		delete w;
	}
}

/*
=============
WriteGLView_r
=============
*/
void WriteGLView_r( node_t *node, idFile *glview )
{
	uPortal_t	*p, *nextp;

	if ( node->planenum != PLANENUM_LEAF )
	{
		WriteGLView_r( node->children[0], glview );
		WriteGLView_r( node->children[1], glview );
		return;
	}

	// write all the portals
	for ( p = node->portals; p; p = nextp )
	{
		if ( p->nodes[0] == node )
		{
			OutputPortal( p, glview );
			nextp = p->next[0];
		}
		else {
			nextp = p->next[1];
		}
	}
}

/*
=============
WriteGLView
=============
*/
void WriteGLView( tree_t *tree, char *source )
{
	idFile *glview;

	c_glfaces = 0;
	common->Printf( "Writing %s\n", source );

	glview = fileSystem->OpenExplicitFileWrite( source );
	if ( !glview ) {
		common->Error( "Couldn't open %s", source );
	}
	WriteGLView_r( tree->headnode, glview );
	fileSystem->CloseFile( glview );

	common->Printf( "%5i c_glfaces\n", c_glfaces );
}