/**
* Copyright (c) 2008-2010 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.jogl;
import javax.media.opengl.GL;
import javax.media.opengl.GL2GL3;
import javax.media.opengl.GLContext;
import com.ardor3d.renderer.ContextManager;
import com.ardor3d.renderer.RenderContext;
import com.ardor3d.renderer.jogl.JoglRenderer;
import com.ardor3d.renderer.state.OffsetState;
import com.ardor3d.renderer.state.OffsetState.OffsetType;
import com.ardor3d.renderer.state.RenderState.StateType;
import com.ardor3d.renderer.state.record.OffsetStateRecord;
public abstract class JoglOffsetStateUtil {
public static void apply(final JoglRenderer renderer, final OffsetState state) {
// ask for the current state record
final RenderContext context = ContextManager.getCurrentContext();
final OffsetStateRecord record = (OffsetStateRecord) context.getStateRecord(StateType.Offset);
context.setCurrentState(StateType.Offset, state);
if (state.isEnabled()) {
// enable any set offset types
setOffsetEnabled(OffsetType.Fill, state.isTypeEnabled(OffsetType.Fill), record);
setOffsetEnabled(OffsetType.Line, state.isTypeEnabled(OffsetType.Line), record);
setOffsetEnabled(OffsetType.Point, state.isTypeEnabled(OffsetType.Point), record);
// set factor and units.
setOffset(state.getFactor(), state.getUnits(), record);
} else {
// disable all offset types
setOffsetEnabled(OffsetType.Fill, false, record);
setOffsetEnabled(OffsetType.Line, false, record);
setOffsetEnabled(OffsetType.Point, false, record);
// set factor and units to default 0, 0.
setOffset(0, 0, record);
}
if (!record.isValid()) {
record.validate();
}
}
private static void setOffsetEnabled(final OffsetType type, final boolean typeEnabled,
final OffsetStateRecord record) {
final GL gl = GLContext.getCurrentGL();
final int glType = getGLType(type);
if (!record.isValid() || typeEnabled != record.enabledOffsets.contains(type)) {
if (typeEnabled) {
gl.glEnable(glType);
} else {
gl.glDisable(glType);
}
}
}
private static void setOffset(final float factor, final float units, final OffsetStateRecord record) {
final GL gl = GLContext.getCurrentGL();
if (!record.isValid() || record.factor != factor || record.units != units) {
gl.glPolygonOffset(factor, units);
record.factor = factor;
record.units = units;
}
}
private static int getGLType(final OffsetType type) {
switch (type) {
case Fill:
return GL.GL_POLYGON_OFFSET_FILL;
case Line:
return GL2GL3.GL_POLYGON_OFFSET_LINE;
case Point:
return GL2GL3.GL_POLYGON_OFFSET_POINT;
}
throw new IllegalArgumentException("invalid type: " + type);
}
}