lay base for supporting different MP interfaces

src/net/MPInterface.cpp

@@ -0,0 +1,60 @@
+/*
+    Copyright 2016-2024 melonDS team
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#include "MPInterface.h"
+#include "LocalMP.h"
+
+namespace melonDS
+{
+
+class DummyMP : public MPInterface
+{
+public:
+    void Process() override {}
+
+    void Begin(int inst) override {}
+    void End(int inst) override {}
+
+    int SendPacket(int inst, u8* data, int len, u64 timestamp) override { return 0; }
+    int RecvPacket(int inst, u8* data, u64* timestamp) override { return 0; }
+    int SendCmd(int inst, u8* data, int len, u64 timestamp) override { return 0; }
+    int SendReply(int inst, u8* data, int len, u64 timestamp, u16 aid) override { return 0; }
+    int SendAck(int inst, u8* data, int len, u64 timestamp) override { return 0; }
+    int RecvHostPacket(int inst, u8* data, u64* timestamp) override { return 0; }
+    u16 RecvReplies(int inst, u8* data, u64 timestamp, u16 aidmask) override { return 0; }
+};
+
+
+std::unique_ptr<MPInterface> MPInterface::Current(std::make_unique<DummyMP>());
+
+
+void MPInterface::Set(MPInterfaceType type)
+{
+    switch (type)
+    {
+    case MPInterface_Local:
+        Current = std::make_unique<LocalMP>();
+        break;
+
+    default:
+        Current = std::make_unique<DummyMP>();
+        break;
+    }
+}
+
+}