#ifndef __RENDERSTATE_H
#define __RENDERSTATE_H


#include "common.h"
#include "glInterface.h"
#include <Cg/cg.h>
#include <Cg/cgGL.h>


namespace CHCDemoEngine 
{

/** The current render state.
*/
class RenderState
{
public:

	enum Mode
	{
		QUERY,
		RENDER
	};

	/// the used render type for this render pass
	enum RenderPassType
	{
		FIXED,
		DEPTH_PASS,
		DEFERRED
	};

	/** Constructor setting render as default state.
	*/
	RenderState();
	
	~RenderState() { Reset(); };
	/** This must be called each time before and after an occlusion test.
		Mode is one of render mode or query mode. Returns true if a state
		change was issued.
	*/
	bool SetState(Mode mode);
	/** Sets the current render state.
	*/
	void SetState(bool texturing, bool alphaTest, bool cullFace);
	/** Returns either query or render mode
	*/
	inline Mode GetMode() const { return mMode; }
	/** Reset the state.
	*/
	void Reset();
	/** Stores the current vbo id.
	*/
	inline void SetCurrentVboId(int id) { mCurrentVboId = id; }
	/** Returns the current vbo id.
	*/
	inline int GetCurrentVboId() const { return mCurrentVboId; }
	/** If alpha to coverage is instead of alpha testing
	*/
	void SetUseAlphaToCoverage(bool useAlphaToCoverage);
	/** Sets the type of rendering used (foreward, depth pass, deferred)
	*/
	void SetRenderPassType(RenderPassType t);
	/** See Set
	*/
	RenderPassType GetRenderPassType() const;
	/** If true, the current value of cull face enabled / disable will
		not be changed by the render state.
	*/
	void LockCullFaceEnabled(bool lockCull);


	///////////////////
	//-- for deferred shading, we have to switch shaders on and off

	static CGprofile sCgFragmentProfile;
	static CGprofile sCgVertexProfile; 

	static CGprogram sCgMrtFragmentProgram;
	static CGprogram sCgMrtFragmentTexProgram;

	static CGparameter sTexParam;

protected:

	bool mAlphaTestEnabled;
	bool mCullFaceEnabled;
	bool mTexturesEnabled;

	Mode mMode;

	int mCurrentVboId;

	RenderPassType mRenderType;

	bool mUseAlphaToCoverage;

	bool mLockCullFaceEnabled;
};


}

#endif // __RENDERSTATE_H