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package gl4java.utils.textures;
import gl4java.*;
import java.io.*;
import java.net.*;
/**
* This is Class implements a TGA texture-loader !
* At this time, this loader only supports
* loading files, which are saved with
* the TGATextureGrabber !
* This means: 24 bpp, RGB, uncompressed, no-colormap,
* no image id-field !
*
* @see IOTextureLoader
* @see TextureLoader
*/
public class TGATextureLoader
extends IOTextureLoader
{
public TGATextureLoader(GLFunc gl, GLUFunc glu)
{
super(gl, glu);
}
protected boolean readTexture(InputStream is)
{
try {
int cc;
glFormat=GL_RGB;
DataInputStream reader = new DataInputStream ( is );
//write TGA header
reader.readByte(); //ID length, 0 because no image id field
reader.readByte(); //no color map
cc = reader.readByte(); //image type (24 bit RGB, uncompressed)
if(cc!=2)
{
reader.close();
System.out.println("TGATextureLoader: File is not 24bit RGB Data !");
error=true;
return false;
}
reader.readShort(); //color map origin, ignore because no color map
reader.readShort(); //color map length, ignore because no color map
reader.readByte(); //color map entry size, ignore because no color map
reader.readShort(); //x origin
reader.readShort(); //y origin
cc = reader.readByte(); // image width low byte
short s = (short)((short)cc & 0x00ff);
cc = reader.readByte(); // image width high byte
s = (short) ( (short)( ((short)cc & 0x00ff)<<8 ) | s );
imageWidth = (int)s;
cc = reader.readByte(); // image height low byte
s = (short)((short)cc & 0x00ff);
cc = reader.readByte(); // image height high byte
s = (short) ( (short)( ((short)cc & 0x00ff)<<8 ) | s );
imageHeight = (int)s;
cc=reader.readByte(); // 24bpp
if(cc!=24)
{
reader.close();
System.out.println("TGATextureLoader: File is not 24bpp Data !");
error=true;
return false;
}
reader.readByte(); //description bits
if(3!=getComponents())
{
reader.close();
System.out.println("TGATextureLoader: Currenly only RGB (24bit) data is supported !");
error=true;
return false;
}
pixel=new byte[imageWidth * imageHeight * 3];
//read TGA image data
reader.read(pixel, 0, pixel.length);
//process image data:
// TGA pixels should be written in BGR format,
// so R en B should be switched
byte tmp;
for (int i=0; i<imageWidth*imageHeight*3; i+=3)
{
tmp=pixel[i];
pixel[i]=pixel[i+2];
pixel[i+2]=tmp;
}
reader.close();
setTextureSize();
return true;
} catch (Exception ex) {
System.out.println("An exception occured, while loading a TGATexture");
System.out.println(ex);
error=true;
}
return false;
}
}
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