re-add OSD system

src/frontend/qt_sdl/OSD.h

@@ -0,0 +1,36 @@
+/*
+    Copyright 2016-2020 Arisotura
+
+    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/.
+*/
+
+#ifndef OSD_H
+#define OSD_H
+
+namespace OSD
+{
+
+bool Init(QOpenGLFunctions_3_2_Core* f);
+void DeInit(QOpenGLFunctions_3_2_Core* f);
+
+void AddMessage(u32 color, const char* text);
+
+void Update(QOpenGLFunctions_3_2_Core* f);
+void DrawNative(QPainter& painter);
+void DrawGL(QOpenGLFunctions_3_2_Core* f, float w, float h);
+
+}
+
+#endif // OSD_H