83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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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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///////////////////////////////////////////////////////////////////////////////
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// Terrain Constants:
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//
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// PATCH_SIZE: number of tiles in each patch
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const int PATCH_SIZE = 16;
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// CELL_SIZE: size of each tile in x and z
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const int CELL_SIZE = 4;
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// HEIGHT_SCALE: vertical scale of terrain - terrain has a coordinate range of
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// 0 to 65536*HEIGHT_SCALE
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const float HEIGHT_SCALE = 0.35f/256.0f;
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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() { return m_MapSize; }
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// return number of patches along edge of the terrain
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u32 GetPatchesPerSide() { return m_MapSizePatches; }
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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(int32 x,int32 z);
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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(int32 x,int32 z);
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// calculate the position of a given vertex
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void CalcPosition(u32 i,u32 j,CVector3D& pos);
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// calculate the normal at a given vertex
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void CalcNormal(u32 i,u32 j,CVector3D& normal);
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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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extern CTerrain g_Terrain;
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#endif
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