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/*
 * Copyright (C) 2012 Daniel Heinrich 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package darwin.renderer.shader;

import java.io.*;
import java.nio.*;
import java.util.Arrays;

import darwin.renderer.GraphicContext;
import darwin.renderer.opengl.ShaderProgramm;

import com.google.common.base.Optional;
import com.jogamp.common.nio.Buffers;
import javax.media.opengl.*;

/**
 *
 * @author Daniel Heinrich 
 */
public class CompiledShader implements Externalizable {

    public static final String EXTENSION_STRING = "GL_ARB_get_program_binary";
    private static int[] formats;
    private int format;
    private ByteBuffer data;

    public CompiledShader(int format, ByteBuffer data) {
        this.format = format;
        this.data = data;
    }

    public static CompiledShader fromShader(GraphicContext gc, ShaderProgramm prog) {
        GL2ES2 gl = gc.getGL().getGL2ES2();

        int pid = prog.getPObject();
        IntBuffer length = Buffers.newDirectIntBuffer(1);

        gl.glGetProgramiv(pid, GL2.GL_PROGRAM_BINARY_RETRIEVABLE_HINT, length);
        if (length.get(0) == GL.GL_FALSE) {
            throw new RuntimeException("The binary of this shader program is not retrievable(set PROGRAM_BINARY_RETRIEVABLE_HINT to true)!");
        }

        gl.glGetProgramiv(pid, GL2.GL_PROGRAM_BINARY_LENGTH, length);
        IntBuffer format = Buffers.newDirectIntBuffer(1);
        ByteBuffer data = Buffers.newDirectByteBuffer(length.get(0));
        gl.glGetProgramBinary(pid, length.get(0), length, format, data);

        if (gl.glGetError() == GL.GL_INVALID_OPERATION) {
            //invalid state can occure when program isn't linked or the buffer is to smale
            throw new RuntimeException("The given shader program is not in a valid state(not linked correctly)");
        }

        return new CompiledShader(format.get(0), data);
    }

    public Optional toShader(GraphicContext gc) {
        GL2ES2 gl = gc.getGL().getGL2();

        int programObject = gl.glCreateProgram();
        ShaderProgramm prog = new ShaderProgramm(gc, programObject);

        gl.glProgramBinary(prog.getPObject(), format, data, data.limit());
        if (GL2ES2.GL_INVALID_ENUM == gl.glGetError()) {
            return Optional.absent();
        }

        Optional error = prog.verify();
        if (error.isPresent()) {
            return Optional.of(prog);
        } else {
            return Optional.absent();
        }
    }

    public boolean isFormatSupported(GraphicContext gc) {
        if (formats == null) {
            initializeFormats(gc);
        }

        return Arrays.binarySearch(formats, format) >= 0;
    }

    public synchronized static void initializeFormats(GraphicContext gc) {
        GL gl = gc.getGL();

        IntBuffer c = Buffers.newDirectIntBuffer(1);
        gl.glGetIntegerv(GL2ES2.GL_NUM_PROGRAM_BINARY_FORMATS, c);

        c = Buffers.newDirectIntBuffer(c.get(0));
        gl.glGetIntegerv(GL2ES2.GL_PROGRAM_BINARY_FORMATS, c);

        formats = c.array();
    }

    public static boolean isAvailable(GraphicContext gc) {
        return gc.getGL().isExtensionAvailable(EXTENSION_STRING);
    }

    public ByteBuffer getData() {
        return data;
    }

    public int getFormat() {
        return format;
    }

    @Override
    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeInt(format);
        byte[] dataArray = getDataArray();
        out.writeInt(dataArray.length);
        out.write(dataArray);
    }

    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        format = in.readInt();
        int len = in.readInt();
        byte[] d = new byte[len];
        in.read(d);
        data = ByteBuffer.wrap(d);
    }

    public byte[] getDataArray() {
        data.rewind();
        byte[] d = new byte[data.limit()];
        data.get(d);
        return d;
    }
}