Windows support

shared/Paths.cpp

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+#include "Paths.h"
+
+#include <cstdlib>
+
+#if defined(_WIN32)
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#endif
+
+#ifndef BS_ASSET_DIR
+#define BS_ASSET_DIR "assets"
+#endif
+
+namespace bs {
+
+namespace fs = std::filesystem;
+
+fs::path executableDir() {
+#if defined(_WIN32)
+    std::wstring buf(32768, L'\0');
+    DWORD n = GetModuleFileNameW(nullptr, buf.data(), DWORD(buf.size()));
+    buf.resize(n);
+    return fs::path(buf).parent_path();
+#else
+    std::error_code ec;
+    fs::path exe = fs::read_symlink("/proc/self/exe", ec);
+    return ec ? fs::current_path() : exe.parent_path();
+#endif
+}
+
+fs::path userDataDir() {
+    fs::path base;
+#if defined(_WIN32)
+    if (const char* a = std::getenv("APPDATA"); a && *a) base = a;
+#else
+    if (const char* x = std::getenv("XDG_DATA_HOME"); x && *x) base = x;
+    else if (const char* h = std::getenv("HOME"); h && *h) base = fs::path(h) / ".local/share";
+#endif
+    if (base.empty()) base = ".";
+    fs::path d = base / "brandling-safari";
+    std::error_code ec;
+    fs::create_directories(d, ec);
+    return d;
+}
+
+const std::string& gameAssetDir() {
+    static const std::string dir = [] {
+        fs::path packaged = executableDir() / "assets";
+        std::error_code ec;
+        if (fs::exists(packaged / "characters" / "manifest.json", ec)) return packaged.string();
+        return std::string(BS_ASSET_DIR);
+    }();
+    return dir;
+}
+
+}  // namespace bs

shared/Paths.h

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+#pragma once
+// Where things live on disk.
+//
+// Assets: a release package keeps them next to the executables
+// (`<exe dir>/assets` for the game, `<exe dir>/engine` for the engine's shaders,
+// fonts, textures and models); a development build falls back to the source
+// checkout paths baked in by CMake (BS_ASSET_DIR / HD2D_ENGINE_ASSET_DIR).
+
+#include <filesystem>
+#include <string>
+
+namespace bs {
+
+std::filesystem::path executableDir();
+// %APPDATA%\brandling-safari on Windows, $XDG_DATA_HOME/brandling-safari or
+// ~/.local/share/brandling-safari elsewhere. Created if missing.
+std::filesystem::path userDataDir();
+// Game asset root (contains characters/manifest.json).
+const std::string& gameAssetDir();
+
+}  // namespace bs