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gistfile1.txt

- (void)drawCIImage:(CIImage *)image
{
	CGRect rect = [image extent];
	
	CIContext *coreImageContext;

	EAGLContext *glContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
	[EAGLContext setCurrentContext:glContext];
	
	// http://developer.apple.com/library/ios/#documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/WorkingwithEAGLContexts/WorkingwithEAGLContexts.html
	
	GLuint framebuffer;
	glGenFramebuffers(1, &framebuffer);
	glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
	
	GLuint colorRenderbuffer;
	glGenRenderbuffers(1, &colorRenderbuffer);
	glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
	glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8_OES, rect.size.width, rect.size.height);
	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);
	
	GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER) ;
	if(status != GL_FRAMEBUFFER_COMPLETE) {
		NSLog(@"failed to make complete framebuffer object %x", status);
	}
	
	
	coreImageContext = [CIContext contextWithEAGLContext:glContext];
	[coreImageContext drawImage:image atPoint:CGPointZero fromRect:rect];
}