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https://gitea.wildfiregames.com/0ad/0ad
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734386ce9f
Replace premade bitmap fonts with FreeType2 and dynamic texture atlas. Switched from static, premade bitmap fonts to runtime-generated glyphs using FreeType2. Glyphs are rendered on demand into a dynamic texture atlas, improving scalability, font quality, and support for internationalization. Currently using RGBA format for compatibility across all render paths while initial support for R8_UNORM is being added. This prepares for future optimizations in VRAM and performance Includes groundwork for gamma-corrected blending and future swizzling support.
63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
/* Copyright (C) 2025 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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#ifndef INCLUDED_FONTMANAGER
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#define INCLUDED_FONTMANAGER
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#include "ps/CStrIntern.h"
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include <unordered_map>
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class CFont;
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/**
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* Font manager: loads and caches bitmap fonts.
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*/
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class CFontManager
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{
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public:
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CFontManager();
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~CFontManager() = default;
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NONCOPYABLE(CFontManager);
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std::shared_ptr<CFont> LoadFont(CStrIntern fontName);
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void UploadTexturesAtlasToGPU();
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private:
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static void ftLibraryDeleter(FT_Library library) {
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FT_Done_FreeType(library);
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}
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std::unique_ptr<FT_LibraryRec_, decltype(&ftLibraryDeleter)> m_FreeType{nullptr, &ftLibraryDeleter};
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std::shared_ptr<std::array<float,256>> m_GammaCorrectionLUT;
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using FontsMap = std::unordered_map<CStrIntern, std::shared_ptr<CFont>>;
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FontsMap m_Fonts;
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/*
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* Most monitors today use 2.2 as the standard gamma.
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* MacOS may use 2.2 or 1.8 in some cases.
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* This method assumes your OS or GPU didn’t override the gamma ramp.
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* Unless we need super-accurate gamma (e.g., for print preview or color grading), this is usually acceptable.
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*/
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static constexpr float GAMMA_CORRECTION = 2.2f;
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};
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#endif // INCLUDED_FONTMANAGER
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