#ifndef __RENDERSTATE_H
#define __RENDERSTATE_H


#include "common.h"


namespace CHCDemoEngine 
{

class ShaderProgram;
class Texture;
class Material;

/** Class representing the current render state.
*/
class RenderState
{
public:

	enum Mode
	{
		QUERY,
		RENDER
	};

	/** Constructor setting render as default state.
	*/
	RenderState();
	/** 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 SetMode(Mode mode);
	/** Sets the current render state with the current technique + scene entity
	*/
	void SetState(Technique *tech, SceneEntity *ent = NULL);
	/** Returns the current render state.
	*/
	Technique *GetState() { return mCurrentTechnique; }
	/** 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; }
	/** Sets the index of the render technique that is used to render a material. 
		Initially we use foreward = 0, deferred = 1, depth pass = 1
	*/
	void SetRenderTechnique(int t);
	/** See Set
	*/
	int GetRenderTechnique() const;
	/** If alpha to coverage is instead of alpha testing
	*/
	void SetUseAlphaToCoverage(bool useAlphaToCoverage);
	/** If true, the current value of cull face enabled / disable will
		not be changed by the render state.
	*/
	void LockCullFaceEnabled(bool lockCull);
	

protected:


	//////////////////

	bool mAlphaTestEnabled;
	bool mCullFaceEnabled;
	bool mTexturesEnabled;
	/// Render or query mode
	Mode mMode;

	int mCurrentVboId;
	/// the current render technique
	int mRenderTechnique;

	bool mUseAlphaToCoverage;

	bool mLockCullFaceEnabled;

	int mCurrentTexId;

	ShaderProgram *mCurrentVertexProgram;
	ShaderProgram *mCurrentFragmentProgram;

	bool mFragmentProgramEnabled;
	bool mVertexProgramEnabled;

	bool mLightingEnabled;
	bool mColorWriteEnabled;

	Technique *mCurrentTechnique;
	bool mDepthWriteEnabled;
};


}

#endif // __RENDERSTATE_H