/**
 *
 * This file is part of jReality. jReality is open source software, made
 * available under a BSD license:
 *
 * Copyright (c) 2003-2006, jReality Group: Charles Gunn, Tim Hoffmann, Markus
 * Schmies, Steffen Weissmann.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * - Redistributions 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 jReality nor the names of its contributors nor the
 *   names of their associated organizations may be used to endorse or promote
 *   products derived from this software without specific prior written
 *   permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */


package de.jreality.jogl.shader;

import java.awt.Color;

import javax.media.opengl.GL;

import de.jreality.jogl.JOGLRenderer;
import de.jreality.jogl.JOGLRenderingState;
import de.jreality.scene.Appearance;
import de.jreality.shader.CommonAttributes;
import de.jreality.shader.EffectiveAppearance;
import de.jreality.shader.GlslProgram;
import de.jreality.shader.ShaderUtility;


/**
 * @author gunn
 *
 */
public class DefaultVertexShader {
	public Color	
		ambientColor,
		diffuseColor,
		specularColor;		
	public double 	specularExponent, 
		ambientCoefficient, 
		diffuseCoefficient, 
		specularCoefficient, 
		transparency;	
	public float[] 
	    specularColorAsFloat, 
	    ambientColorAsFloat, 
	    diffuseColorAsFloat;
	
	public DefaultVertexShader() {
		super();
	}

	public void setFromEffectiveAppearance(EffectiveAppearance eap, String name)	{
		specularExponent = eap.getAttribute(ShaderUtility.nameSpace(name,CommonAttributes.SPECULAR_EXPONENT), CommonAttributes.SPECULAR_EXPONENT_DEFAULT);
		ambientCoefficient = eap.getAttribute(ShaderUtility.nameSpace(name,CommonAttributes.AMBIENT_COEFFICIENT), CommonAttributes.AMBIENT_COEFFICIENT_DEFAULT);
		diffuseCoefficient = eap.getAttribute(ShaderUtility.nameSpace(name,CommonAttributes.DIFFUSE_COEFFICIENT), CommonAttributes.DIFFUSE_COEFFICIENT_DEFAULT);
		specularCoefficient = eap.getAttribute(ShaderUtility.nameSpace(name,CommonAttributes.SPECULAR_COEFFICIENT), CommonAttributes.SPECULAR_COEFFICIENT_DEFAULT);
		ambientColor = (Color) eap.getAttribute(ShaderUtility.nameSpace(name,CommonAttributes.AMBIENT_COLOR), CommonAttributes.AMBIENT_COLOR_DEFAULT);
		ambientColorAsFloat = ambientColor.getRGBComponents(null);
		diffuseColor = (Color) eap.getAttribute(ShaderUtility.nameSpace(name,CommonAttributes.DIFFUSE_COLOR), CommonAttributes.DIFFUSE_COLOR_DEFAULT);
//		System.err.println("dc = "+diffuseColor);
		transparency= eap.getAttribute(ShaderUtility.nameSpace(name,CommonAttributes.TRANSPARENCY), CommonAttributes.TRANSPARENCY_DEFAULT );
		//JOGLConfiguration.theLog.log(Level.INFO,"Name is "+name+" transparency is "+transparency);
		diffuseColor = ShaderUtility.combineDiffuseColorWithTransparency(diffuseColor, transparency, JOGLRenderingState.useOldTransparency);
		diffuseColorAsFloat = diffuseColor.getRGBComponents(null);
		specularColor = (Color) eap.getAttribute(ShaderUtility.nameSpace(name,CommonAttributes.SPECULAR_COLOR), CommonAttributes.SPECULAR_COLOR_DEFAULT);
		specularColorAsFloat = specularColor.getRGBComponents(null);
		for (int i  = 0; i<3; ++i) {
			ambientColorAsFloat[i] *= (float) ambientCoefficient;
			diffuseColorAsFloat[i] *= (float) diffuseCoefficient;
			specularColorAsFloat[i] *= (float) specularCoefficient;
		}
	}

	public void render(JOGLRenderingState jrs)	{
		JOGLRenderer jr = jrs.renderer;
		GL gl = jr.globalGL;
		int frontBack = jrs.frontBack;
//		if (jr.openGLState.frontBack != frontBack)	{
			gl.glColorMaterial(frontBack, GL.GL_DIFFUSE);
//			jr.openGLState.frontBack = frontBack;
//		}
//		if (!(OpenGLState.equals(diffuseColorAsFloat, jr.openGLState.diffuseColor, (float) 10E-5))) {
			if (jr.renderingState.transparencyEnabled || diffuseColorAsFloat[3] == 0.0) gl.glColor4fv( diffuseColorAsFloat,0);
			else gl.glColor3fv(diffuseColorAsFloat,0);
			System.arraycopy(diffuseColorAsFloat, 0, jr.renderingState.diffuseColor, 0, 4);
		    jrs.currentAlpha =jrs.diffuseColor[3];
//		}
			//gl.glMaterialfv(frontBack, GL.GL_DIFFUSE, diffuseColorAsFloat);
		gl.glMaterialfv(frontBack, GL.GL_AMBIENT, ambientColorAsFloat,0);
		gl.glMaterialfv(frontBack, GL.GL_SPECULAR, specularColorAsFloat,0);
		gl.glMaterialf(frontBack, GL.GL_SHININESS, (float) specularExponent);
//		LoggingSystem.getLogger(this).finest("VertexShader: Setting diffuse color to: "+Rn.toString(getDiffuseColorAsFloat()));
	}

	public void postRender(JOGLRenderingState jrs) {
	}

}
