/**
 * $Id: BSP_MeshDrawer.cpp 28254 2010-04-18 10:28:37Z campbellbarton $
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "BSP_MeshDrawer.h"

#include "BSP_TMesh.h"

#if defined(WIN32) || defined(__APPLE__)
#	ifdef WIN32
#		include <windows.h>
#		include <GL/gl.h>
#		include <GL/glu.h>
#	else // WIN32
#		include <AGL/gl.h>
#	endif // WIN32
#else // defined(WIN32) || defined(__APPLE__)
#	include <GL/gl.h>
#	include <GL/glu.h>
#endif // defined(WIN32) || defined(__APPLE__)

#include <vector>

using namespace std;

	void
BSP_MeshDrawer::
DrawMesh(
	BSP_TMesh &mesh,
	int render_mode
){


	if (render_mode == e_none) return;

	// decompose polygons into triangles.

	glEnable(GL_LIGHTING);


	if (render_mode == e_wireframe || render_mode == e_wireframe_shaded) {

		glColor3f(0.0, 0.0, 0.0);

		if (render_mode == e_wireframe) {
			glDisable(GL_LIGHTING);
		} else {
			glEnable(GL_LIGHTING);
		}

		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

		glEnable(GL_POLYGON_OFFSET_FILL);
		glPolygonOffset(1.0,1.0);

		glBegin(GL_TRIANGLES);
			DrawPolies(mesh);
		glEnd();

		glColor3f(1.0, 1.0, 1.0);
		glDisable(GL_LIGHTING);
		glDisable(GL_POLYGON_OFFSET_FILL);
		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

		glBegin(GL_TRIANGLES);
			DrawPolies(mesh);
		glEnd();
		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
	} else {

		glEnable(GL_LIGHTING);

		glBegin(GL_TRIANGLES);
			DrawPolies(mesh);
		glEnd();
	}
	

}


	void
BSP_MeshDrawer::
DrawPolies(
	BSP_TMesh &mesh
){

	const vector<BSP_TVertex> & verts = mesh.VertexSet();
	const vector<BSP_TFace> &faces = mesh.FaceSet();

	// just draw the edges for now.

	vector<BSP_TVertex>::const_iterator vertex_it = verts.begin();


	vector<BSP_TFace>::const_iterator faces_it = faces.begin();
	vector<BSP_TFace>::const_iterator faces_end = faces.end();

	for (;faces_it != faces_end; ++faces_it ){	

		glNormal3f(
			faces_it->m_normal.x(),
			faces_it->m_normal.y(),
			faces_it->m_normal.z()
		);

		glVertex3f(
			verts[faces_it->m_verts[0]].m_pos.x(),
			verts[faces_it->m_verts[0]].m_pos.y(),
			verts[faces_it->m_verts[0]].m_pos.z()
		);
		glVertex3f(
			verts[faces_it->m_verts[1]].m_pos.x(),
			verts[faces_it->m_verts[1]].m_pos.y(),
			verts[faces_it->m_verts[1]].m_pos.z()
		);
		glVertex3f(
			verts[faces_it->m_verts[2]].m_pos.x(),
			verts[faces_it->m_verts[2]].m_pos.y(),
			verts[faces_it->m_verts[2]].m_pos.z()
		);
	}
}