// Demeter Terrain Visualization Library by Clay Fowler
// Copyright (C) 2002 Clay Fowler

// $ID$

/*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA  02111-1307, USA.
*/

#include "Demeter/TriangleStrip.h"
#include "Demeter/Vector.h"

using namespace Demeter;

TriangleStrip::TriangleStrip()
{
}

TriangleStrip::~TriangleStrip()
{
}

void TriangleStrip::Setup(Terrain * pTerrain)
{
	if (m_bEnabled)
	{
		minX = pTerrain->m_pVertices[m_pVertices[0]].x;
		minY = pTerrain->m_pVertices[m_pVertices[0]].y;
		for (int i = 1; i < m_NumberOfVertices; i++)
		{
			if (pTerrain->m_pVertices[m_pVertices[i]].x < minX)
				minX = pTerrain->m_pVertices[m_pVertices[i]].x;
			if (pTerrain->m_pVertices[m_pVertices[i]].y < minY)
				minY = pTerrain->m_pVertices[m_pVertices[i]].y;
		}
		int tileY = (int)((minY - pTerrain->m_OffsetY) / pTerrain->GetTextureTileHeight());
		int tileX = (int)((minX - pTerrain->m_OffsetX) / pTerrain->GetTextureTileWidth());
		textureId = tileY * pTerrain->GetNumberOfTextureTilesWidth() + tileX;
	}
}

void TriangleStrip::Render(Terrain * pTerrain)
{
	if (m_bEnabled)
		glDrawElements(GL_TRIANGLE_STRIP, m_NumberOfVertices, GL_UNSIGNED_INT, m_pVertices);
}