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package jogamp.opengl;
import javax.media.nativewindow.NativeSurface;
import javax.media.opengl.GL;
import javax.media.opengl.GL2GL3;
import javax.media.opengl.GLCapabilitiesImmutable;
import javax.media.opengl.GLContext;
import javax.media.opengl.GLException;
import com.jogamp.nativewindow.MutableGraphicsConfiguration;
import com.jogamp.opengl.FBObject;
import com.jogamp.opengl.FBObject.Attachment;
import com.jogamp.opengl.FBObject.TextureAttachment;
/**
* Offscreen GLDrawable implementation using framebuffer object (FBO)
* as it's offscreen rendering mechanism.
*
* @see GLDrawableImpl#contextRealized(GLContext, boolean)
* @see GLDrawableImpl#contextMadeCurrent(GLContext, boolean)
* @see GLDrawableImpl#getDefaultDrawFramebuffer()
* @see GLDrawableImpl#getDefaultReadFramebuffer()
*/
public class GLFBODrawableImpl extends GLDrawableImpl {
final GLDrawableImpl parent;
final FBObject fbo;
int texUnit;
int samplesTexUnit = 0;
int width=0, height=0, samples=0;
protected GLFBODrawableImpl(GLDrawableFactoryImpl factory, GLDrawableImpl parent,
NativeSurface surface, int initialWidth, int initialHeight, int textureUnit) {
super(factory, surface, false);
this.parent = parent;
this.texUnit = textureUnit;
final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) surface.getGraphicsConfiguration().getChosenCapabilities();
this.width = initialWidth;
this.height = initialHeight;
this.samples = caps.getNumSamples();
this.fbo = new FBObject();
}
@Override
protected void contextRealized(GLContext glc, boolean realized) {
final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) surface.getGraphicsConfiguration().getChosenCapabilities();
final GL gl = glc.getGL();
if(realized) {
fbo.reset(gl, width, height, samples);
samples = fbo.getNumSamples(); // update, maybe capped
if(samples > 0) {
fbo.attachColorbuffer(gl, 0, caps.getAlphaBits()>0);
} else {
fbo.attachTexture2D(gl, 0, caps.getAlphaBits()>0);
}
if( caps.getStencilBits() > 0 ) {
fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH_STENCIL, 24);
} else {
fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH, 24);
}
} else if(null != fbo) {
fbo.destroy(gl);
}
}
@Override
protected void contextMadeCurrent(GLContext glc, boolean current) {
final GL gl = glc.getGL();
if(current) {
fbo.bind(gl);
} else {
fbo.unbind(gl);
gl.glActiveTexture(GL.GL_TEXTURE0 + texUnit);
fbo.use(gl, samples > 0 ? fbo.getSamplingSink() : (TextureAttachment) fbo.getColorbuffer(0) );
if( samples > 0) {
gl.glBindFramebuffer(GL2GL3.GL_READ_FRAMEBUFFER, fbo.getReadFramebuffer());
}
}
}
@Override
protected int getDefaultDrawFramebuffer() { return fbo.getWriteFramebuffer(); }
@Override
protected int getDefaultReadFramebuffer() { return fbo.getReadFramebuffer(); }
public FBObject getFBObject() { return fbo; }
public void setSize(GL gl, int newWidth, int newHeight) throws GLException {
width = newWidth;
height = newHeight;
fbo.reset(gl, width, height, samples);
samples = fbo.getNumSamples(); // update, maybe capped
}
public void setSamples(GL gl, int newSamples) throws GLException {
samples = newSamples;
fbo.reset(gl, width, height, samples);
samples = fbo.getNumSamples(); // update, maybe capped
}
@Override
public GLContext createContext(GLContext shareWith) {
final GLContext ctx = parent.createContext(shareWith);
ctx.setGLDrawable(this, false);
return ctx;
}
@Override
public GLDynamicLookupHelper getGLDynamicLookupHelper() {
return parent.getGLDynamicLookupHelper();
}
@Override
protected void swapBuffersImpl() {
}
@Override
protected void setRealizedImpl() {
parent.setRealized(realized);
if(realized) {
final MutableGraphicsConfiguration msConfig = (MutableGraphicsConfiguration) surface.getGraphicsConfiguration();
final GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable) msConfig.getChosenCapabilities();
final GLCapabilitiesImmutable chosenFBOCaps = GLGraphicsConfigurationUtil.fixOffscreenGLCapabilities(chosenCaps, true /*FBO*/, false /*PBO*/);
msConfig.setChosenCapabilities(chosenFBOCaps);
}
}
@Override
public int getWidth() {
return width;
}
@Override
public int getHeight() {
return height;
}
}
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