/**
* Copyright (c) 2008-2012 Ardor Labs, Inc.
*
* This file is part of Ardor3D.
*
* Ardor3D is free software: you can redistribute it and/or modify it
* under the terms of its license which may be found in the accompanying
* LICENSE file or at <http://www.ardor3d.com/LICENSE>.
*/
package com.ardor3d.renderer.queue;
import java.util.Comparator;
import com.ardor3d.renderer.state.RenderState;
import com.ardor3d.renderer.state.TextureState;
import com.ardor3d.scenegraph.Mesh;
import com.ardor3d.scenegraph.Spatial;
import com.ardor3d.util.TextureKey;
public class OpaqueRenderBucket extends AbstractRenderBucket {
public OpaqueRenderBucket() {
super();
_comparator = new OpaqueComparator();
}
private class OpaqueComparator implements Comparator<Spatial> {
public int compare(final Spatial o1, final Spatial o2) {
if (o1 instanceof Mesh && o2 instanceof Mesh) {
return compareByStates((Mesh) o1, (Mesh) o2);
}
final double d1 = distanceToCam(o1);
final double d2 = distanceToCam(o2);
if (d1 > d2) {
return 1;
} else if (d1 < d2) {
return -1;
} else {
return 0;
}
}
/**
* Compare opaque items by their texture states - generally the most expensive switch. Later this might expand
* to comparisons by other states as well, such as lighting or material.
*/
private int compareByStates(final Mesh mesh1, final Mesh mesh2) {
final TextureState ts1 = (TextureState) mesh1.getWorldRenderState(RenderState.StateType.Texture);
final TextureState ts2 = (TextureState) mesh2.getWorldRenderState(RenderState.StateType.Texture);
if (ts1 == ts2) {
return 0;
} else if (ts1 == null && ts2 != null) {
return -1;
} else if (ts2 == null && ts1 != null) {
return 1;
}
for (int x = 0, maxIndex = Math.min(ts1.getMaxTextureIndexUsed(), ts2.getMaxTextureIndexUsed()); x <= maxIndex; x++) {
final TextureKey key1 = ts1.getTextureKey(x);
final TextureKey key2 = ts2.getTextureKey(x);
if (key1 == null) {
if (key2 == null) {
continue;
} else {
return -1;
}
} else if (key2 == null) {
return 1;
}
final int tid1 = key1.hashCode();
final int tid2 = key2.hashCode();
if (tid1 == tid2) {
continue;
} else if (tid1 < tid2) {
return -1;
} else {
return 1;
}
}
if (ts1.getMaxTextureIndexUsed() != ts2.getMaxTextureIndexUsed()) {
return ts2.getMaxTextureIndexUsed() - ts1.getMaxTextureIndexUsed();
}
return 0;
}
}
}