101 lines
3.5 KiB
C++
Executable File
101 lines
3.5 KiB
C++
Executable File
///////////////////////////////////////////////////////////////////////////////
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//
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// Name: Terrain.h
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// Author: Rich Cross
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// Contact: rich@wildfiregames.com
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _TERRAIN_H
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#define _TERRAIN_H
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#include "Patch.h"
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#include "Vector3D.h"
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#include "Vector2D.h"
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///////////////////////////////////////////////////////////////////////////////
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// CTerrain: main terrain class; contains the heightmap describing elevation
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// data, and the smaller subpatches that form the terrain
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class CTerrain
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{
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public:
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CTerrain();
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~CTerrain();
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bool Initialize(u32 size,const u16* ptr);
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// return number of vertices along edge of the terrain
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u32 GetVerticesPerSide() const { return m_MapSize; }
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// return number of patches along edge of the terrain
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u32 GetPatchesPerSide() const { return m_MapSizePatches; }
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inline bool isOnMap( float x, float y ) const
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{
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return( ( x >= 0.0f ) && ( x <= (float)( m_MapSize * CELL_SIZE ) ) && ( y >= 0.0f ) && ( y <= (float)( m_MapSize * CELL_SIZE ) ) );
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}
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inline bool isOnMap( const CVector2D& v ) const
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{
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return( ( v.x >= 0.0f ) && ( v.x <= (float)( m_MapSize * CELL_SIZE ) ) && ( v.y >= 0.0f ) && ( v.y <= (float)( m_MapSize * CELL_SIZE ) ) );
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}
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float getVertexGroundLevel( int x, int y ) const ;
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float getExactGroundLevel( float x, float y ) const ;
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inline float getExactGroundLevel( const CVector2D& v ) const { return( getExactGroundLevel( v.x, v.y ) ); }
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// resize this terrain such that each side has given number of patches
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void Resize(u32 size);
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// set up a new heightmap from 16 bit data; assumes heightmap matches current terrain size
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void SetHeightMap(u16* heightmap);
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// return a pointer to the heightmap
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u16* GetHeightMap() const { return m_Heightmap; }
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// get patch at given coordinates, expressed in patch-space; return 0 if
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// coordinates represent patch off the edge of the map
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CPatch* GetPatch(i32 x, i32 z) const;
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// get tile at given coordinates, expressed in tile-space; return 0 if
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// coordinates represent tile off the edge of the map
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CMiniPatch* GetTile(i32 x, i32 z) const;
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// calculate the position of a given vertex
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void CalcPosition(i32 i, i32 j, CVector3D& pos) const;
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// calculate the vertex under a given position (rounding down coordinates)
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static void CalcFromPosition(const CVector3D& pos, i32& i, i32& j)
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{
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i = pos.X / CELL_SIZE; j = pos.Z / CELL_SIZE;
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}
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// calculate the vertex under a given position (rounding down coordinates)
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static void CalcFromPosition(float x, float y, i32& i, i32& j)
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{
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i = x / CELL_SIZE; j = y / CELL_SIZE;
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}
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// calculate the normal at a given vertex
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void CalcNormal(u32 i, u32 j, CVector3D& normal) const;
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// flatten out an area of terrain (specified in world space coords); return
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// the average height of the flattened area
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float FlattenArea(float x0,float x1,float z0,float z1);
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// mark a specific square of tiles as dirty - use this after modifying the heightmap
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void MakeDirty(int x0, int z0, int x1, int z1, int dirtyFlags);
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// mark the entire map as dirty
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void MakeDirty(int dirtyFlags);
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private:
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// delete any data allocated by this terrain
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void ReleaseData();
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// setup patch pointers etc
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void InitialisePatches();
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// size of this map in each direction, in vertices; ie. total tiles = sqr(m_MapSize-1)
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u32 m_MapSize;
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// size of this map in each direction, in patches; total patches = sqr(m_MapSizePatches)
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u32 m_MapSizePatches;
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// the patches comprising this terrain
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CPatch* m_Patches;
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// 16-bit heightmap data
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u16* m_Heightmap;
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};
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#endif
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