mirror of https://github.com/minetest/minetest.git
115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
/*
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Minetest
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Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "texturepaths.h"
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#include "util/container.h"
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#include "settings.h"
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#include "filesys.h"
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#include "porting.h"
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#include <vector>
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// A cache from texture name to texture path
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static MutexedMap<std::string, std::string> g_texturename_to_path_cache;
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void clearTextureNameCache()
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{
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g_texturename_to_path_cache.clear();
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}
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// Find out the full path of an image by trying different filename extensions.
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// If failed, return "".
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std::string getImagePath(std::string_view path)
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{
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// A NULL-ended list of possible image extensions
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// (In newer C++ versions a fixed size array and ranges::subrange could be used
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// or just modernise removeStringEnd.)
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static const char *extensions[] = {".png", ".jpg", ".bmp", ".tga", nullptr};
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// Remove present extension
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std::string_view stripped_path = removeStringEnd(path, extensions);
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// If there is no known extension, assume it has been omitted.
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if (stripped_path.empty())
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stripped_path = path;
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for (const char *ext : extensions) {
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if (!ext)
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break;
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std::string extended_path(stripped_path);
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extended_path.append(ext);
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if (fs::PathExists(extended_path))
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return extended_path;
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}
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return "";
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}
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/* Gets the path to a texture by first checking if the texture exists
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* in texture_path and if not, using the data path.
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*
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* Checks all supported extensions by replacing the original extension.
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*
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* If not found, returns "".
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*
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* Utilizes a thread-safe cache.
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*/
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std::string getTexturePath(const std::string &filename, bool *is_base_pack)
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{
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std::string fullpath;
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// This can set a wrong value on cached textures, but is irrelevant because
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// is_base_pack is only passed when initializing the textures the first time
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if (is_base_pack)
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*is_base_pack = false;
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// Check from cache
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bool incache = g_texturename_to_path_cache.get(filename, &fullpath);
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if (incache)
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return fullpath;
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// Check from texture_path setting
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for (const auto &path : getTextureDirs()) {
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// Check all filename extensions. Returns "" if not found.
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fullpath = getImagePath(path + DIR_DELIM + filename);
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if (!fullpath.empty())
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break;
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}
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// Check from default data directory i.e. .../minetest/textures/base/pack
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if (fullpath.empty()) {
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std::string base_path = porting::path_share + DIR_DELIM + "textures"
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+ DIR_DELIM + "base" + DIR_DELIM + "pack";
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// Check all filename extensions. Returns "" if not found.
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fullpath = getImagePath(base_path + DIR_DELIM + filename);
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if (is_base_pack && !fullpath.empty())
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*is_base_pack = true;
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}
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// Add to cache (also an empty result is cached)
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g_texturename_to_path_cache.set(filename, fullpath);
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// Finally return it
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return fullpath;
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}
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std::vector<std::string> getTextureDirs()
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{
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return fs::GetRecursiveDirs(g_settings->get("texture_path"));
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}
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