[Feat] (Core): Add env config loader and refactor initialization entrypoints.

2026-09-08 04:08:32 +09:00 · 2026-02-21 22:08:55 +08:00
parent 7ccf858181
commit 9e90d9508b
10 changed files with 110 additions and 34 deletions
@@ -0,0 +1,75 @@
+// MobileGL - MobileGL/ConfigLoader.cpp
+// Copyright (c) 2025-2026 MobileGL-Dev
+// Licensed under the GNU Lesser General Public License v3.0:
+//   https://www.gnu.org/licenses/gpl-3.0.txt
+//   https://www.gnu.org/licenses/lgpl-3.0.txt
+// SPDX-License-Identifier: LGPL-3.0-only
+// End of Source File Header
+
+#include "Config.h"
+
+namespace MobileGL::MG_ConfigLoader {
+    static UnorderedMap<String, String> acceptedEnvVariablesMap;
+
+    static Bool IsAcceptedPrefix(const String& key) {
+        return (key.compare(0, 6, "LIBGL_") == 0 || key.compare(0, 9, "MOBILEGL_") == 0);
+    }
+
+    inline void InitializeAcceptedEnvVariables() {
+        acceptedEnvVariablesMap.clear();
+        char** envPtr = nullptr;
+
+#ifdef _WIN32
+        envPtr = _environ;
+#else // POSIX
+        envPtr = ::environ;
+#endif
+
+        if (envPtr == nullptr) return;
+
+        for (char** env = envPtr; *env != nullptr; ++env) {
+            String entry(*env);
+            SizeT pos = entry.find('=');
+            if (pos != String::npos) {
+                String key = entry.substr(0, pos);
+                String value = entry.substr(pos + 1);
+
+                if (IsAcceptedPrefix(key)) {
+                    acceptedEnvVariablesMap[key] = value;
+                }
+            }
+        }
+    }
+
+    inline void QueryEnvVariable(const String& key, String& outValue, const String& defaultValue) {
+        auto it = acceptedEnvVariablesMap.find(key);
+        if (it != acceptedEnvVariablesMap.end()) {
+            outValue = it->second;
+        } else {
+            outValue = defaultValue;
+        }
+    }
+
+    inline void InitBackendType() {
+        String backendTypeStr;
+        QueryEnvVariable("MOBILEGL_BACKEND_TYPE", backendTypeStr, "DirectGLES");
+#define ENTRY(backendType)                                                                                             \
+    if (backendTypeStr == #backendType) {                                                                              \
+        MG_Config::ActiveBackendType = BackendType::backendType;                                                       \
+        MGLOG_I("Config: Active backend type set to " #backendType);                                                   \
+        return;                                                                                                        \
+    }
+        ENTRY(DirectGLES)
+        ENTRY(DirectVulkan)
+        ENTRY(Unknown)
+        MG_Config::ActiveBackendType = BackendType::Unknown;
+#undef ENTRY
+    }
+
+    void Init() {
+        MGLOG_D("Loading configuration from environment variables...");
+        InitializeAcceptedEnvVariables();
+
+        InitBackendType();
+    }
+} // namespace MobileGL::MG_ConfigLoader