ui: Add primary xemu user interface

ui/xemu-hud.h

@@ -0,0 +1,49 @@
+/*
+ * xemu User Interface
+ *
+ * Subsystem handling primary graphical user interface, which can be controlled
+ * via mouse and keyboard or through any attached gamepad.
+ *
+ * Copyright (C) 2020 Matt Borgerson
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef XEMU_HUD_H
+#define XEMU_HUD_H
+
+#include <SDL.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Implemented in xemu.c
+extern int scaling_mode;
+int xemu_is_fullscreen(void);
+void xemu_monitor_init(void);
+void xemu_toggle_fullscreen(void);
+
+// Implemented in xemu_hud.cc
+void xemu_hud_init(SDL_Window *window, void *sdl_gl_context);
+void xemu_hud_cleanup(void);
+void xemu_hud_render(SDL_Window *window);
+void xemu_hud_process_sdl_events(SDL_Event *event);
+void xemu_hud_should_capture_kbd_mouse(int *kbd, int *mouse);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif