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include/engine/gpu/gpu_fbo.h

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+/* -----------------------------------------------------------------------------
+	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;
+
+		/// 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__