/**
* Returns a ByteBuffer of BufferedImage data. Ensure BufferedImage is of 4BYTE_ABGR type. If
* imageFormat is set to GL_RGBA, byte stream will be converted.
*/
private ByteBuffer getByteBuffer(final BufferedImage _image) {
final DataBuffer buffer = _image.getRaster().getDataBuffer();
final int type = buffer.getDataType();
if (type == DataBuffer.TYPE_BYTE) {
final byte[] data = ((DataBufferByte) buffer).getData();
if (imageFormat == GL3.GL_RGBA) {
convertABGRtoRGBA(data);
}
return ByteBuffer.wrap(data);
}
System.out.println("Failed to determine DataBuffer type.");
return null;
}
/**
* Binds the BufferedImage byte-stream into video memory. BufferedImage must be in 4BYTE_ABGR.
* 4BYTE_ABGR removes endinese problems.
*/
public Texture bind(final BufferedImage _image, final InternalFormat _format) {
final GL3 gl = GLRenderer.getCanvas().getContext().getCurrentGL().getGL3();
if (gl == null) {
System.out.println("GL context doesn't exist");
return null;
}
gl.glEnable(GL.GL_TEXTURE_2D);
final int textureID = glGenTextures(gl);
gl.glBindTexture(GL3.GL_TEXTURE_2D, textureID);
gl.glTexParameteri(GL3.GL_TEXTURE_2D, GL3.GL_TEXTURE_WRAP_S, GL3.GL_REPEAT);
gl.glTexParameteri(GL3.GL_TEXTURE_2D, GL3.GL_TEXTURE_WRAP_T, GL3.GL_REPEAT);
gl.glTexParameteri(GL3.GL_TEXTURE_2D, GL3.GL_TEXTURE_MAG_FILTER, GL3.GL_LINEAR);
gl.glTexParameteri(GL3.GL_TEXTURE_2D, GL3.GL_TEXTURE_MIN_FILTER, GL3.GL_LINEAR_MIPMAP_LINEAR);
final int width = _image.getWidth();
final int height = _image.getHeight();
final int channels = _image.getSampleModel().getNumBands();
int internalFormat = GL3.GL_RGB;
if (gl.isExtensionAvailable("GL_EXT_abgr") == true) {
switch (channels) {
case 4:
imageFormat = GL2.GL_ABGR_EXT;
break;
case 3:
imageFormat = GL3.GL_BGR;
break;
case 1:
imageFormat = GL3.GL_RED;
break;
}
} else {
switch (channels) {
case 4:
imageFormat = GL3.GL_RGBA;
break;
case 3:
imageFormat = GL3.GL_RGB;
break;
case 1:
imageFormat = GL3.GL_RED;
break;
}
}
gl.glPixelStorei(GL3.GL_UNPACK_ALIGNMENT, 1);
gl.glTexImage2D(
GL3.GL_TEXTURE_2D,
0,
getGLInternalFormat(channels, _format),
width,
height,
0,
imageFormat,
GL3.GL_UNSIGNED_BYTE,
getByteBuffer(_image));
gl.glGenerateMipmap(GL3.GL_TEXTURE_2D);
gl.glBindTexture(GL.GL_TEXTURE_2D, 0); // Reset to default texture
return new Texture(new GLImage(textureID, width, height));
}