vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/* Copyright (C) 2020 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Describes ground using heightmap mipmaps
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* Used for camera movement
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*/
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#ifndef INCLUDED_HEIGHTMIPMAP
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#define INCLUDED_HEIGHTMIPMAP
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#include <vector>
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class Path;
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using VfsPath = Path;
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struct SMipmap
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{
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SMipmap() : m_MapSize(0), m_Heightmap(0) { }
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SMipmap(size_t MapSize, u16* Heightmap) : m_MapSize(MapSize), m_Heightmap(Heightmap) { }
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size_t m_MapSize;
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u16* m_Heightmap;
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};
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class CHeightMipmap
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{
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NONCOPYABLE(CHeightMipmap);
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public:
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CHeightMipmap();
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~CHeightMipmap();
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void Initialize(size_t mapSize, const u16* ptr);
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void ReleaseData();
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// update the heightmap mipmaps
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void Update(const u16* ptr);
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// update a section of the heightmap mipmaps
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// (coordinates are heightmap cells, inclusive of lower bounds,
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// exclusive of upper bounds)
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void Update(const u16* ptr, size_t left, size_t bottom, size_t right, size_t top);
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float GetTrilinearGroundLevel(float x, float z, float radius) const;
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void DumpToDisk(const VfsPath& path) const;
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private:
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// get bilinear filtered height from mipmap
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float BilinearFilter(const SMipmap &mipmap, float x, float z) const;
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// update rectangle of the output mipmap by bilinear interpolating an input mipmap of exactly twice its size
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void HalfResizeUpdate(SMipmap &out_mipmap, size_t mapSize, const u16* ptr, size_t left, size_t bottom, size_t right, size_t top);
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// update rectangle of the output mipmap by bilinear interpolating the input mipmap
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void BilinearUpdate(SMipmap &out_mipmap, size_t mapSize, const u16* ptr, size_t left, size_t bottom, size_t right, size_t top);
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// size of this map in each direction
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size_t m_MapSize;
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// mipmap list
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std::vector<SMipmap> m_Mipmap;
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};
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#endif
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