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/*

 *  ShadowBuffer.h

 *  02564_Framework

 *

 *  Created by J. Andreas Bærentzen on 01/02/11.

 *  Copyright 2011 __MyCompanyName__. All rights reserved.

 *

 */

#ifndef __SHADOWBUFFER_H__

#define __SHADOWBUFFER_H__

#include <GL/glew.h>

#include <GLGraphics/glsl_shader.h>

/** This class represents a shadow buffer. Essentially, this is just a texture

 and a framebuffer object wrapped in a class. Note that the shadow is a depth 

 texture */

class ShadowBuffer

{

	const int dim; // Size

	GLuint fbo, rb; // The framebuffer object and the render buffer

	GLuint dtex; // The depth texture 

	/// Let go of resources 

	void relinquish();

public:

	/// Construct with default size 1024

    ShadowBuffer(int _dim = 1024);

	/// Destroy, releasing resources

	~ShadowBuffer() {relinquish();}

	/// Initialize: Acquire resources. 

	void initialize();

	/** Enable the framebuffer object. There is no disable(). This seems unsymmetrical, but 

	 we do not necessarily switch back to the framebuffer we had prior to enable. So switching 

	 back might incur an unnecessary FBO switch. */

	int enable();

	/// Bind the depth map texture to specified tex unit.

	void bind_textures(int dtex_unit);

};

#endif