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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
*/
package net.java.joglutils.msg.elements;
import java.nio.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import net.java.joglutils.msg.math.*;
import net.java.joglutils.msg.misc.*;
import net.java.joglutils.msg.nodes.*;
/** Represents the blending state of the OpenGL fixed-function
pipeline and causes side-effects in OpenGL for rendering. */
public class GLBlendElement extends BlendElement {
// Boilerplate for concrete element subclasses
public Element newInstance() {
return new GLBlendElement();
}
public static GLBlendElement getInstance(State state) {
return (GLBlendElement) BlendElement.getInstance(state);
}
public static void enable(State defaultState) {
Element tmp = new GLBlendElement();
defaultState.setElement(tmp.getStateIndex(), tmp);
}
public void pop(State state, Element previousTopElement) {
send();
}
public void setElt(boolean enabled,
Vec4f blendColor,
int srcFunc,
int destFunc,
int blendEquation) {
super.setElt(enabled, blendColor, srcFunc, destFunc, blendEquation);
send();
}
private static int oglBlendFunc(int func) {
switch (func) {
case Blend.ZERO: return GL.GL_ZERO;
case Blend.ONE: return GL.GL_ONE;
case Blend.SRC_COLOR: return GL.GL_SRC_COLOR;
case Blend.ONE_MINUS_SRC_COLOR: return GL.GL_ONE_MINUS_SRC_COLOR;
case Blend.DST_COLOR: return GL.GL_DST_COLOR;
case Blend.ONE_MINUS_DST_COLOR: return GL.GL_ONE_MINUS_DST_COLOR;
case Blend.SRC_ALPHA: return GL.GL_SRC_ALPHA;
case Blend.ONE_MINUS_SRC_ALPHA: return GL.GL_ONE_MINUS_SRC_ALPHA;
case Blend.DST_ALPHA: return GL.GL_DST_ALPHA;
case Blend.ONE_MINUS_DST_ALPHA: return GL.GL_ONE_MINUS_DST_ALPHA;
case Blend.SRC_ALPHA_SATURATE: return GL.GL_SRC_ALPHA_SATURATE;
case Blend.CONSTANT_COLOR: return GL.GL_CONSTANT_COLOR;
case Blend.ONE_MINUS_CONSTANT_COLOR: return GL.GL_ONE_MINUS_CONSTANT_COLOR;
case Blend.CONSTANT_ALPHA: return GL.GL_CONSTANT_ALPHA;
case Blend.ONE_MINUS_CONSTANT_ALPHA: return GL.GL_ONE_MINUS_CONSTANT_ALPHA;
}
throw new InternalError("Illegal blend function " + func);
}
private int oglBlendEquation(int equation) {
switch (equation) {
case Blend.FUNC_ADD: return GL.GL_FUNC_ADD;
case Blend.FUNC_SUBTRACT: return GL.GL_FUNC_SUBTRACT;
case Blend.FUNC_REVERSE_SUBTRACT: return GL.GL_FUNC_REVERSE_SUBTRACT;
case Blend.MIN: return GL.GL_MIN;
case Blend.MAX: return GL.GL_MAX;
}
throw new InternalError("Illegal blend equation " + equation);
}
private static void validateFunc(GL gl, int func) {
if (func == GL.GL_CONSTANT_COLOR ||
func == GL.GL_ONE_MINUS_CONSTANT_COLOR ||
func == GL.GL_CONSTANT_ALPHA ||
func == GL.GL_ONE_MINUS_CONSTANT_ALPHA) {
if (!gl.isExtensionAvailable("GL_ARB_imaging")) {
throw new RuntimeException("Blend function requires GL_ARB_imaging extension");
}
}
}
private void send() {
GL gl = GLU.getCurrentGL();
// Don't try to optimize what we send to OpenGL at this point -- too complicated
if (enabled) {
gl.glEnable(GL.GL_BLEND);
int oglSrcFunc = oglBlendFunc(srcFunc);
int oglDestFunc = oglBlendFunc(destFunc);
validateFunc(gl, oglSrcFunc);
validateFunc(gl, oglDestFunc);
gl.glBlendFunc(oglSrcFunc, oglDestFunc);
if (gl.isExtensionAvailable("GL_ARB_imaging")) {
gl.glBlendEquation(oglBlendEquation(blendEquation));
gl.glBlendColor(blendColor.x(), blendColor.y(), blendColor.z(), blendColor.w());
}
} else {
gl.glDisable(GL.GL_BLEND);
}
}
}
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