/* -----------------------------------------------------------------------------
	GSFramework
	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
----------------------------------------------------------------------------- */


#ifndef	__GPUFBO__
#define __GPUFBO__


		#include "ntypes.h"
		#include "geometry/rect.h"
		#include "alloc/ialloc.h"


namespace GS {
	namespace Render { struct Texture; }
	namespace GPU {
		class Renderer;

/*!
	@short	GPU frame buffer object.
	@author	Emmanuel Julien (ejulien@nworks.fr)
*/
struct	FBO
{
		NPLACEMENT_NEW(Renderer)

		Renderer		&renderer;

		uint			color_texture_count;

		Render::Texture	*color_texture[8], *depth_texture;

		/// Set output color texture.
virtual	void			SetColorTexture(Render::Texture *t)
		{
			color_texture[0] = t;
			color_texture_count = 1;
		}
		/// Set output color texture.
virtual	void			SetColorTexture(Render::Texture *t[], uint n)
		{
			for	(color_texture_count = 0; color_texture_count < n; ++color_texture_count)
				color_texture[color_texture_count] = t[color_texture_count];
		}
		/// Set output depth texture.
virtual	void			SetDepthTexture(Render::Texture *t)
		{	depth_texture = t;	}

		/// Blit attachment to another FBO attachment.
virtual	void			Blit(FBO *out, const iRect &src, const iRect &dst, bool color = true, bool depth = true) = 0;
		/// Transfer color pixels into a CPU based buffer, this buffer is expected to be big enough to hold the required region in RGBA format.
virtual	void			ReadColorPixels(char *out, int x, int y, int w, int h) = 0;
virtual	void			ReadDepthPixels(float *out) = 0;

		/// Create FBO.
virtual	bool			Create() = 0;
		/// Free FBO.
virtual	void			Free() = 0;

		FBO(Renderer &r) : renderer(r)
		{
			for (uint n = 0; n < 8; ++n)
				color_texture[n] = 0;
			color_texture_count = 0;
			depth_texture = 0;
		}
virtual	~FBO() {}
};

	} // GPU
} // GS


#endif	// __GPUFBO__