/** 
 * @file llvlcomposition.h
 * @brief Viewer-side representation of a composition layer...
 *
 * Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
 * $License$
 */

#ifndef LL_LLVLCOMPOSITION_H
#define LL_LLVLCOMPOSITION_H

#include "llviewerlayer.h"
#include "llviewerimage.h"

class LLSurface;

class LLVLComposition : public LLViewerLayer
{
public:
	LLVLComposition(LLSurface *surfacep, const U32 width, const F32 scale);
	/*virtual*/ ~LLVLComposition();

	void setSurface(LLSurface *surfacep);

	// Viewer side hack to generate composition values
	BOOL generateHeights(const F32 x, const F32 y, const F32 width, const F32 height);
	BOOL generateComposition();
	// Generate texture from composition values.
	BOOL generateTexture(const F32 x, const F32 y, const F32 width, const F32 height);		

	// Use these as indeces ito the get/setters below that use 'corner'
	enum ECorner
	{
		SOUTHWEST = 0,
		SOUTHEAST = 1,
		NORTHWEST = 2,
		NORTHEAST = 3,
		CORNER_COUNT = 4
	};
	LLUUID getDetailTextureID(S32 corner);
	LLViewerImage* getDetailTexture(S32 corner);
	F32 getStartHeight(S32 corner);
	F32 getHeightRange(S32 corner);

	void setDetailTextureID(S32 corner, const LLUUID& id);
	void setStartHeight(S32 corner, F32 start_height);
	void setHeightRange(S32 corner, F32 range);

	friend class LLVOSurfacePatch;
	friend class LLDrawPoolTerrain;
	void setParamsReady()		{ mParamsReady = TRUE; }
	BOOL getParamsReady() const	{ return mParamsReady; }
protected:
	BOOL mParamsReady;
	LLSurface *mSurfacep;
	BOOL mTexturesLoaded;

	LLPointer<LLViewerImage> mDetailTextures[CORNER_COUNT];

	F32 mStartHeight[CORNER_COUNT];
	F32 mHeightRange[CORNER_COUNT];

	F32 mTexScaleX;
	F32 mTexScaleY;
};

#endif //LL_LLVLCOMPOSITION_H