/*
===========================================================================

Shared terrain source model

===========================================================================
*/
#ifndef __MODEL_TERRAIN_H__
#define __MODEL_TERRAIN_H__

#define TERRAIN_DEFAULT_VERTS			65
#define TERRAIN_DEFAULT_CELL_SIZE		512.0f
#define TERRAIN_DEFAULT_PAINT_SIZE		257
#define TERRAIN_MAX_LAYERS				4

class idTerrainPatch {
public:
	idTerrainPatch();

	idStr		name;
	idStr		material;
	idStr		layerMaterials[TERRAIN_MAX_LAYERS];
	idVec3		origin;
	int			width;
	int			height;
	float		cellSize;
	idList<float> heights;
	int			paintWidth;
	int			paintHeight;
	idList<idVec4> paintWeights;

	// Editor preview cache state. Runtime code ignores this, but keeping it on the
	// source object lets Radiant edit the exact model data that gets parsed/written.
	unsigned int paintTexture;
	bool		paintTextureDirty;
	int			paintDirtyMinX;
	int			paintDirtyMinY;
	int			paintDirtyMaxX;
	int			paintDirtyMaxY;

	idBounds	bounds;

	int			SampleIndex( int x, int y ) const;
	int			PaintIndex( int x, int y ) const;
	float		SampleHeight( int x, int y ) const;
	void		SetHeight( int x, int y, float height );
	bool		SetHeightBySample( int sample, float height );
	idVec4		SamplePaintWeight( int x, int y ) const;
	void		SetPaintWeight( int x, int y, const idVec4 &weight );
	bool		SetPaintWeightBySample( int sample, const idVec4 &weight );
	float		WorldWidth() const;
	float		WorldHeight() const;
	float		BilinearHeight( float u, float v ) const;
	idVec3		VertexUV( float u, float v ) const;
	idVec3		Vertex( int x, int y ) const;
	idVec3		VertexNormal( int x, int y ) const;
	void		UpdateBounds();
	void		EnsureLayerData( const char *defaultMaterial );
	void		ClearLayerWeight( int layer );
	bool		SetLayerMaterials( const idStr layerMaterials[TERRAIN_MAX_LAYERS], const char *defaultMaterial );
	void		MarkPaintTextureDirty();
	void		ClearPaintTextureDirtyRect();
	void		MarkPaintTextureDirtyRect( int minX, int minY, int maxX, int maxY );

	static idVec4 BaseLayerWeight();
	static idVec4 NormalizeLayerWeight( const idVec4 &weight );
};

class idTerrainModel {
public:
							idTerrainModel();
							~idTerrainModel();

	void					Clear();
	int						NumTerrains() const;
	idTerrainPatch *		Terrain( int index );
	const idTerrainPatch *	Terrain( int index ) const;
	idList<idTerrainPatch *> &Terrains();
	const idList<idTerrainPatch *> &Terrains() const;

	idTerrainPatch *		AllocDefaultTerrain( const idVec3 &center, const char *defaultMaterial, float gridSize );
	void					AddTerrain( idTerrainPatch *terrain );

	bool					LoadFile( const char *filename, const char *defaultMaterial );
	bool					SaveFile( const char *filename );

	static idStr			FileNameForMap( const char *mapFileName );

private:
	idList<idTerrainPatch *> terrains;
};

#endif