/**
 * Copyright 2010 JogAmp Community. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``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 JogAmp Community 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.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of JogAmp Community.
 */
package jogamp.graph.curve.opengl;

import java.util.ArrayList;

import javax.media.opengl.GL;
import javax.media.opengl.GL2ES2;

import jogamp.graph.curve.opengl.shader.AttributeNames;

import com.jogamp.graph.curve.Region;
import com.jogamp.graph.curve.opengl.RenderState;
import com.jogamp.graph.geom.AABBox;
import com.jogamp.graph.geom.Vertex;
import com.jogamp.graph.geom.Triangle;
import com.jogamp.opengl.util.GLArrayDataServer;
import com.jogamp.opengl.util.glsl.ShaderState;

public class VBORegionSPES2  implements Region {
    private int numVertices = 0;
    
    private ArrayList<Triangle> triangles = new ArrayList<Triangle>();
    private ArrayList<Vertex> vertices = new ArrayList<Vertex>();
    private GLArrayDataServer verticeAttr = null;
    private GLArrayDataServer texCoordAttr = null;
    private GLArrayDataServer indices = null;
    
    private boolean flipped = false;
    private boolean dirty = true;
    
    private AABBox box = null;
    
    public VBORegionSPES2(RenderState rs){        
        box = new AABBox();
        
        final int initialSize = 256;
        final ShaderState st = rs.getShaderState();
        
        indices = GLArrayDataServer.createData(3, GL2ES2.GL_SHORT, initialSize, GL.GL_STATIC_DRAW, GL.GL_ELEMENT_ARRAY_BUFFER);        
        
        verticeAttr = GLArrayDataServer.createGLSL(st, AttributeNames.VERTEX_ATTR_NAME, 3, 
                                                   GL2ES2.GL_FLOAT, false, initialSize, GL.GL_STATIC_DRAW); 
        st.bindAttribute(verticeAttr);
        
        texCoordAttr = GLArrayDataServer.createGLSL(st, AttributeNames.TEXCOORD_ATTR_NAME, 2, 
                                                    GL2ES2.GL_FLOAT, false, initialSize, GL.GL_STATIC_DRAW);
        st.bindAttribute(texCoordAttr);
        
        if(DEBUG_INSTANCE) {
            System.err.println("VBORegionSPES2 Create: " + this);
        }        
    }
    
    public void update(GL2ES2 gl){
        if(!dirty) {
            return; 
        }
        
        // process triangles
        indices.seal(gl, false);
        indices.rewind();        
        for(Triangle t:triangles){
            final Vertex[] t_vertices = t.getVertices();
            
            if(t_vertices[0].getId() == Integer.MAX_VALUE){
                t_vertices[0].setId(numVertices++);
                t_vertices[1].setId(numVertices++);
                t_vertices[2].setId(numVertices++);
                                
                vertices.add(t.getVertices()[0]);
                vertices.add(t.getVertices()[1]);
                vertices.add(t.getVertices()[2]);

                indices.puts((short) t.getVertices()[0].getId());
                indices.puts((short) t.getVertices()[1].getId());
                indices.puts((short) t.getVertices()[2].getId());
            }
            else{
                Vertex v1 = t_vertices[0];
                Vertex v2 = t_vertices[1];
                Vertex v3 = t_vertices[2];
                
                indices.puts((short) v1.getId());
                indices.puts((short) v2.getId());
                indices.puts((short) v3.getId());
            }
        }
        indices.seal(gl, true);
        indices.enableBuffer(gl, false);
        
        // process vertices and update bbox
        box.reset();
        verticeAttr.seal(gl, false); 
        verticeAttr.rewind();
        texCoordAttr.seal(gl, false);
        texCoordAttr.rewind();
        for(Vertex v:vertices){            
            if(flipped){
                verticeAttr.putf(v.getX());
                verticeAttr.putf(-1*v.getY());
                verticeAttr.putf(v.getZ());
                
                box.resize(v.getX(),-1*v.getY(),v.getZ());
            }
            else{
                verticeAttr.putf(v.getX());
                verticeAttr.putf(v.getY());
                verticeAttr.putf(v.getZ());
                
                box.resize(v.getX(),v.getY(),v.getZ());
            }
            
            final float[] tex = v.getTexCoord();
            texCoordAttr.putf(tex[0]);
            texCoordAttr.putf(tex[1]);
        }
        verticeAttr.seal(gl, true);        
        verticeAttr.enableBuffer(gl, false);
        texCoordAttr.seal(gl, true);
        texCoordAttr.enableBuffer(gl, false);
        
        // update all bbox related data: nope
        
        dirty = false;
        
        // the buffers were disabled, since due to real/fbo switching and other vbo usage
    }
    
    private void render(GL2ES2 gl) {
        verticeAttr.enableBuffer(gl, true);       
        texCoordAttr.enableBuffer(gl, true);
        indices.enableBuffer(gl, true);
        
        gl.glDrawElements(GL2ES2.GL_TRIANGLES, indices.getElementNumber() * indices.getComponentNumber(), GL2ES2.GL_UNSIGNED_SHORT, 0);         
        
        verticeAttr.enableBuffer(gl, false);       
        texCoordAttr.enableBuffer(gl, false);
        indices.enableBuffer(gl, false);
    }
    
    public void render(GL2ES2 gl, RenderState rs, int vp_width, int vp_height, int width) {
        render(gl);
    }
    
    public void addTriangles(ArrayList<Triangle> tris) {
        triangles.addAll(tris);
        dirty = true;
    }
    
    public int getNumVertices(){
        return numVertices;
    }
    
    public void addVertices(ArrayList<Vertex> verts){
        vertices.addAll(verts);
        numVertices = vertices.size();
        dirty = true;
    }
    
    public boolean isDirty(){
        return dirty;
    }
    
    public final void destroy(GL2ES2 gl) {
        if(DEBUG_INSTANCE) {
            System.err.println("VBORegionSPES2 Destroy: " + this);
        }        
        if(null != verticeAttr) {
            verticeAttr.destroy(gl);
            verticeAttr = null;
        }
        if(null != texCoordAttr) {
            texCoordAttr.destroy(gl);
            texCoordAttr = null;
        }
        if(null != indices) {
            indices.destroy(gl);
            indices = null;
        }
    }
    
    public boolean isFlipped() {
        return flipped;
    }

    public void setFlipped(boolean flipped) {
        this.flipped = flipped;
    }
    public AABBox getBounds(){
        return box;
    }
}