OpenGL rendering component. First iteration, WiP.

src/include/86box/win_opengl.h

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+/*
+ * 86Box	A hypervisor and IBM PC system emulator that specializes in
+ *		running old operating systems and software designed for IBM
+ *		PC systems and compatibles from 1981 through fairly recent
+ *		system designs based on the PCI bus.
+ *
+ *		This file is part of the 86Box distribution.
+ *
+ *		Header file for OpenGL rendering module
+ *
+ * Authors:	Teemu Korhonen
+ *
+ *		Copyright 2021 Teemu Korhonen
+ */
+#ifndef WIN_OPENGL_H
+#define WIN_OPENGL_H
+
+#define UNICODE
+#include <Windows.h>
+
+extern int opengl_init(HWND hwnd);
+extern int opengl_pause();
+extern void opengl_close();
+extern void opengl_set_fs(int fs);
+extern void opengl_enable(int enable);
+
+#endif /*!WIN_OPENGL_H*/