Proposed method for Syphon Server to publish a Framebuffer.

gistfile1.m

- (void)publishFramebuffer:(GLuint)fboID imageRegion:(NSRect)region textureDimensions:(NSSize)size
{
	// TODO: we should probably check we're not already bound and raise an exception here
	// to enforce proper use
#if !SYPHON_DEBUG_NO_DRAWING
	// check the images bounds, compare with our cached rect, if they dont match, rebuild the IOSurface/FBO/Texture combo.
	if(! NSEqualSizes(_surfaceTexture.textureSize, size)) 
	{
		[self destroyIOSurface];
		[self setupIOSurfaceForSize:size];
		_pushPending = YES;
	}
	
	glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &_previousFBO);
	glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING_EXT, &_previousReadFBO);
	glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING_EXT, &_previousDrawFBO);
	
	glBindFramebuffer(GL_READ_FRAMEBUFFER, fboID);
	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, _surfaceFBO);

	glBlitFramebuffer(region.origin.x, region.origin.y,
	                  region.size.width, region.size.height,
	                  0, 0, size.width, size.height,
	                  GL_COLOR_BUFFER_BIT, GL_LINEAR);

	glFlushRenderAPPLE();

	// restore state
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _previousFBO);
	glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, _previousReadFBO);
	glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, _previousDrawFBO);
#endif
	if (_pushPending)
	{
		// Our IOSurface won't update until the next glFlush(). Usually we rely on our host doing this, but
		// we must do it for the first frame on a new surface to avoid sending surface details for a surface
		// which has no clean image.
		glFlush();
		// Push the new surface ID to clients
		[(SyphonServerConnectionManager *)_connectionManager setSurfaceID:IOSurfaceGetID(_surfaceRef)];
		_pushPending = NO;
	}
	[(SyphonServerConnectionManager *)_connectionManager publishNewFrame];
}