/**
* 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.scene.state.lwjgl;
import java.nio.DoubleBuffer;
import org.lwjgl.opengl.GL11;
import com.ardor3d.renderer.ContextCapabilities;
import com.ardor3d.renderer.ContextManager;
import com.ardor3d.renderer.RenderContext;
import com.ardor3d.renderer.state.ClipState;
import com.ardor3d.renderer.state.RenderState.StateType;
import com.ardor3d.renderer.state.record.ClipStateRecord;
public abstract class LwjglClipStateUtil {
public static void apply(final ClipState state) {
// ask for the current state record
final RenderContext context = ContextManager.getCurrentContext();
final ClipStateRecord record = (ClipStateRecord) context.getStateRecord(StateType.Clip);
context.setCurrentState(StateType.Clip, state);
final ContextCapabilities caps = context.getCapabilities();
final int max = Math.min(ClipState.MAX_CLIP_PLANES, caps.getMaxUserClipPlanes());
if (state.isEnabled()) {
for (int i = 0; i < max; i++) {
enableClipPlane(i, state.getPlaneEnabled(i), state, record);
}
} else {
for (int i = 0; i < max; i++) {
enableClipPlane(i, false, state, record);
}
}
if (!record.isValid()) {
record.validate();
}
}
private static void enableClipPlane(final int planeIndex, final boolean enable, final ClipState state,
final ClipStateRecord record) {
if (enable) {
if (!record.isValid() || !record.planeEnabled[planeIndex]) {
GL11.glEnable(GL11.GL_CLIP_PLANE0 + planeIndex);
record.planeEnabled[planeIndex] = true;
}
record.buf.rewind();
((DoubleBuffer) record.buf).put(state.getPlaneEquations(planeIndex));
record.buf.flip();
GL11.glClipPlane(GL11.GL_CLIP_PLANE0 + planeIndex, (DoubleBuffer) record.buf);
} else {
if (!record.isValid() || record.planeEnabled[planeIndex]) {
GL11.glDisable(GL11.GL_CLIP_PLANE0 + planeIndex);
record.planeEnabled[planeIndex] = false;
}
}
}
}