62 lines
2 KiB
C
62 lines
2 KiB
C
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// Copyright (C) 2007 Id Software, Inc.
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//
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#ifndef __GAME_DECLS_HEIGHTMAP_H__
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#define __GAME_DECLS_HEIGHTMAP_H__
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class sdHeightMapScaleData {
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public:
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void Init( const idBounds& bounds ) {
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mins = bounds.GetMins();
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size = bounds.Size();
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for ( int i = 0; i < 3; i++ ) {
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invSize[ i ] = 1 / size[ i ];
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}
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heightScale = size[ 2 ] / 256.f;
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heightOffset = mins[ 2 ];
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}
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idVec3 mins;
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idVec3 size;
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idVec3 invSize;
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float heightScale;
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float heightOffset;
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};
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class sdHeightMap {
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public:
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sdHeightMap( void );
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~sdHeightMap( void );
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void Clear( void );
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void Init( int w, int h, byte height );
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void Load( const char* filename );
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float GetHeight( const idVec3& pos, const sdHeightMapScaleData& scale ) const {
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int coords[ 2 ];
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coords[ 0 ] = idMath::ClampFloat( 0.f, 1.f, ( pos[ 0 ] - scale.mins[ 0 ] ) * scale.invSize[ 0 ] ) * ( dimensions[ 0 ] - 1 );
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coords[ 1 ] = idMath::ClampFloat( 0.f, 1.f, ( pos[ 1 ] - scale.mins[ 1 ] ) * scale.invSize[ 1 ] ) * ( dimensions[ 1 ] - 1 );
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return ( data[ coords[ 0 ] + ( coords[ 1 ] * dimensions[ 0 ] ) ] * scale.heightScale ) + scale.heightOffset;
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}
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float GetInterpolatedHeight( const idVec3& pos, const sdHeightMapScaleData& scale ) const;
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void GetHeight( const idBounds& pos, idVec2& out, const sdHeightMapScaleData& scale ) const;
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float GetHeight( const idVec3& start, const idVec3& end, const sdHeightMapScaleData& scale ) const;
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// this does a kind-of-trace through the heightmap for really rough approximation work
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// where you don't want to do it in the full physics world
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// heightOffset acts as if you're tracing through an offset world
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float TracePoint( const idVec3& start, const idVec3& end, idVec3& result, float heightOffset, const sdHeightMapScaleData& scale ) const;
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bool IsValid( void ) const { return !data.Empty(); }
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private:
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idList< byte > data;
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int dimensions[ 2 ];
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};
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#endif // __GAME_DECLS_HEIGHTMAP_H__
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