The Quake sources as originally release under the GPL license on December 21, 1999

WinQuake/screen.h

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+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+// screen.h
+
+void SCR_Init (void);
+
+void SCR_UpdateScreen (void);
+
+
+void SCR_SizeUp (void);
+void SCR_SizeDown (void);
+void SCR_BringDownConsole (void);
+void SCR_CenterPrint (char *str);
+
+void SCR_BeginLoadingPlaque (void);
+void SCR_EndLoadingPlaque (void);
+
+int SCR_ModalMessage (char *text);
+
+extern	float		scr_con_current;
+extern	float		scr_conlines;		// lines of console to display
+
+extern	int			scr_fullupdate;	// set to 0 to force full redraw
+extern	int			sb_lines;
+
+extern	int			clearnotify;	// set to 0 whenever notify text is drawn
+extern	qboolean	scr_disabled_for_loading;
+extern	qboolean	scr_skipupdate;
+
+extern	cvar_t		scr_viewsize;
+
+extern cvar_t scr_viewsize;
+
+// only the refresh window will be updated unless these variables are flagged 
+extern	int			scr_copytop;
+extern	int			scr_copyeverything;
+
+extern qboolean		block_drawing;
+
+void SCR_UpdateWholeScreen (void);