/*******************************************************************************
* Copyright 2012 Geoscience Australia
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package au.gov.ga.earthsci.worldwind.common.layers.tiled.image.delegate.nearestneighbor;
import gov.nasa.worldwind.avlist.AVKey;
import gov.nasa.worldwind.avlist.AVList;
import gov.nasa.worldwind.geom.Sector;
import gov.nasa.worldwind.layers.TextureTile;
import gov.nasa.worldwind.render.DrawContext;
import gov.nasa.worldwind.util.Level;
import javax.media.opengl.GL2;
import au.gov.ga.earthsci.worldwind.common.layers.delegate.ITileFactoryDelegate;
import au.gov.ga.earthsci.worldwind.common.layers.tiled.image.delegate.DelegatorTextureTile;
import com.jogamp.opengl.util.texture.Texture;
/**
* {@link TextureTile} which performs NearestNeighbor Magnification at when
* viewing the layer's lowest level (highest resolution).
*
* @author Michael de Hoog (michael.dehoog@ga.gov.au)
*/
public class NearestNeighborTextureTile extends DelegatorTextureTile
{
private int numLevels = 0;
public NearestNeighborTextureTile(Sector sector, Level level, int row, int col,
ITileFactoryDelegate<DelegatorTextureTile, Sector, Level> delegate)
{
super(sector, level, row, col, delegate);
AVList params = level.getParams();
Object o = params.getValue(AVKey.NUM_LEVELS);
if (o != null && o instanceof Integer)
numLevels = (Integer) o;
}
@Override
protected void setTextureParameters(DrawContext dc, Texture t)
{
super.setTextureParameters(dc, t);
//set the magnification filter to nearest neighbor if this tile's level is the layer's last level
if ((numLevels > 0 && getLevelNumber() >= numLevels - 1) || dc.getCurrentLayer().isAtMaxResolution())
{
dc.getGL().glTexParameteri(GL2.GL_TEXTURE_2D, GL2.GL_TEXTURE_MAG_FILTER, GL2.GL_NEAREST);
}
}
}