VisClient/org/dronus/gl/Texture.java

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/*
 * Created on 06.03.2005
 *
 */
package org.dronus.gl;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL14;

public class Texture {

        protected int   level=0, internalformat=GL11.GL_RGBA, border=0, 
        format=GL11.GL_RGBA,type=GL11.GL_UNSIGNED_BYTE;
//    final int MAXSIZE=1024;
        
        public int width,height;
        public float imagewidth,imageheight;
        
    protected int texid;

    protected Texture(){
        texid=GLUtil.genTexture();
        imagewidth=imageheight=1; //subclass has to do the cropping
    }
    
    public Texture(Image image){
        this(image.getWidth(null), image.getHeight(null), GL11.GL_RGBA, true);
        
        setPixels(getImageBuffer(image), width, height);   
    }
    
    public static ByteBuffer getImageBuffer(Image image){
        
        BufferedImage tmpImage;
        int w=image.getWidth(null), h=image.getHeight(null);
        
        //check if we can use this directly as texture data
        if (image instanceof BufferedImage 
                && ((BufferedImage)image).getType()==BufferedImage.TYPE_4BYTE_ABGR)
                tmpImage=(BufferedImage)image;
        else { //we have to convert it do a usable pixel format.
                tmpImage=new BufferedImage(w, h, BufferedImage.TYPE_4BYTE_ABGR);
                tmpImage.getGraphics().drawImage(image,0,0,null);
        }
                
        byte pixelData[] = (byte[])tmpImage.getRaster().getDataElements(0,0,w,h,null);
   
        ByteBuffer pixels = ByteBuffer.allocateDirect(pixelData.length);
        pixels.order(ByteOrder.nativeOrder());        
        pixels.put(pixelData);
        pixels.rewind();
        
        return pixels;
    }
    
    public Texture(ByteBuffer pixels, int w, int h, int glPixelFormat){
        this(w, h, glPixelFormat, true);
        setPixels(pixels,w,h);
    }
    
    
    public Texture(int w, int h, int format, boolean mipmap){
        this.format=format;
        texid=GLUtil.genTexture();
        
        width=w; height=h; 
        
        //this now is for some ATI GPU 
        //TODO check for NON POWER OF TWO capability
        if (Integer.bitCount(w)!=1) w=Integer.highestOneBit(w)*2;
        if (Integer.bitCount(h)!=1) h=Integer.highestOneBit(h)*2;
        
        imagewidth=width/(float)w; imageheight=height/(float)h;  //compute relative size of image inside this texture 
                
        GL11.glBindTexture(GL11.GL_TEXTURE_2D,texid);
        GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D,GL14.GL_GENERATE_MIPMAP, mipmap ? GL11.GL_TRUE : GL11.GL_FALSE);        
        GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, mipmap ? GL11.GL_LINEAR_MIPMAP_LINEAR : GL11.GL_LINEAR);           
        GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);                   
        
        GL11.glTexImage2D(GL11.GL_TEXTURE_2D,level,internalformat,w,h,border,format,type,(ByteBuffer)null);        
    }
    
    protected void setPixels(ByteBuffer pixels, int width, int height){
        GL11.glBindTexture(GL11.GL_TEXTURE_2D,texid);
                //although glTexSubImage is made for fill in a part of an image,
        //its very useful for fast bitmap transfers as it does not reinitalize
        //any texture memories or states.
        GL11.glTexSubImage2D(GL11.GL_TEXTURE_2D,level,0,0,width,height,format,type,pixels);
    }
    

        public void render() {
                GL11.glEnable(GL11.GL_TEXTURE_2D);
                GL11.glBindTexture(GL11.GL_TEXTURE_2D,texid);
        };
        
        protected void finalize() throws Throwable {
                //DEBUG         System.out.println("Freed texture "+texid);
                GL11.glDeleteTextures(Buffers.i(texid));
                super.finalize();               
        }
}

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