84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
// virtualtex.h
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//
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// Copyright (C) 2003, Chris Laurel
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#ifndef _CELENGINE_VIRTUALTEX_H_
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#define _CELENGINE_VIRTUALTEX_H_
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#include <string>
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#include <celengine/texture.h>
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class VirtualTexture : public Texture
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{
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public:
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VirtualTexture(const fs::path& _tilePath,
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unsigned int _baseSplit,
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unsigned int _tileSize,
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const std::string& _tilePrefix,
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const std::string& _tileType);
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~VirtualTexture() = default;
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const TextureTile getTile(int lod, int u, int v) override;
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void bind() override;
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int getLODCount() const override;
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int getUTileCount(int lod) const override;
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int getVTileCount(int lod) const override;
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void beginUsage() override;
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void endUsage() override;
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private:
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struct Tile
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{
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Tile() = default;
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unsigned int lastUsed{ 0 };
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ImageTexture* tex{ nullptr };
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bool loadFailed{ false };
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};
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struct TileQuadtreeNode
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{
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TileQuadtreeNode() = default;
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Tile* tile{ nullptr };
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TileQuadtreeNode* children[4]{ nullptr, nullptr, nullptr, nullptr};
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};
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void populateTileTree();
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void addTileToTree(Tile* tile, unsigned int lod, unsigned int u, unsigned int v);
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void makeResident(Tile* tile, unsigned int lod, unsigned int u, unsigned int v);
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ImageTexture* loadTileTexture(unsigned int lod, unsigned int u, unsigned int v);
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Tile* tiles{ nullptr };
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Tile* findTile(unsigned int lod,
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unsigned int u, unsigned int v);
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private:
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fs::path tilePath;
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fs::path tileExt;
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std::string tilePrefix;
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unsigned int baseSplit{ 0 };
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unsigned int tileSize{ 0 };
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unsigned int ticks{ 0 };
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unsigned int tilesRequested{ 0 };
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unsigned int nResolutionLevels{ 0 };
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enum
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{
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TileNotLoaded = -1,
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TileLoadFailed = -2,
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};
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TileQuadtreeNode* tileTree[2];
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};
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VirtualTexture* LoadVirtualTexture(const fs::path& filename);
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#endif // _CELENGINE_VIRTUALTEX_H_
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