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/* Copyright (C) 2012 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Describes ground using heightmap mipmaps
* Used for camera movement
*/
#ifndef INCLUDED_HEIGHTMIPMAP
#define INCLUDED_HEIGHTMIPMAP
#include "lib/file/vfs/vfs_path.h"
struct SMipmap
{
SMipmap() : m_MapSize(0), m_Heightmap(0) { }
SMipmap(size_t MapSize, u16* Heightmap) : m_MapSize(MapSize), m_Heightmap(Heightmap) { }
size_t m_MapSize;
u16* m_Heightmap;
};
class CHeightMipmap
{
NONCOPYABLE(CHeightMipmap);
public:
CHeightMipmap();
~CHeightMipmap();
void Initialize(size_t mapSize, const u16* ptr);
void ReleaseData();
// update the heightmap mipmaps
void Update(const u16* ptr);
// update a section of the heightmap mipmaps
// (coordinates are heightmap cells, inclusive of lower bounds,
// exclusive of upper bounds)
void Update(const u16* ptr, size_t left, size_t bottom, size_t right, size_t top);
float GetTrilinearGroundLevel(float x, float z, float radius) const;
void DumpToDisk(const VfsPath& path) const;
private:
// get bilinear filtered height from mipmap
float BilinearFilter(const SMipmap &mipmap, float x, float z) const;
// update rectangle of the output mipmap by bilinear interpolating an input mipmap of exactly twice its size
void HalfResizeUpdate(SMipmap &out_mipmap, size_t mapSize, const u16* ptr, size_t left, size_t bottom, size_t right, size_t top);
// update rectangle of the output mipmap by bilinear interpolating the input mipmap
void BilinearUpdate(SMipmap &out_mipmap, size_t mapSize, const u16* ptr, size_t left, size_t bottom, size_t right, size_t top);
// size of this map in each direction
size_t m_MapSize;
// mipmap list
std::vector<SMipmap> m_Mipmap;
};
#endif
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