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

WinQuake/vid.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.
+
+*/
+// vid.h -- video driver defs
+
+#define VID_CBITS	6
+#define VID_GRADES	(1 << VID_CBITS)
+
+// a pixel can be one, two, or four bytes
+typedef byte pixel_t;
+
+typedef struct vrect_s
+{
+	int				x,y,width,height;
+	struct vrect_s	*pnext;
+} vrect_t;
+
+typedef struct
+{
+	pixel_t			*buffer;		// invisible buffer
+	pixel_t			*colormap;		// 256 * VID_GRADES size
+	unsigned short	*colormap16;	// 256 * VID_GRADES size
+	int				fullbright;		// index of first fullbright color
+	unsigned		rowbytes;	// may be > width if displayed in a window
+	unsigned		width;		
+	unsigned		height;
+	float			aspect;		// width / height -- < 0 is taller than wide
+	int				numpages;
+	int				recalc_refdef;	// if true, recalc vid-based stuff
+	pixel_t			*conbuffer;
+	int				conrowbytes;
+	unsigned		conwidth;
+	unsigned		conheight;
+	int				maxwarpwidth;
+	int				maxwarpheight;
+	pixel_t			*direct;		// direct drawing to framebuffer, if not
+									//  NULL
+} viddef_t;
+
+extern	viddef_t	vid;				// global video state
+extern	unsigned short	d_8to16table[256];
+extern	unsigned	d_8to24table[256];
+extern void (*vid_menudrawfn)(void);
+extern void (*vid_menukeyfn)(int key);
+
+void	VID_SetPalette (unsigned char *palette);
+// called at startup and after any gamma correction
+
+void	VID_ShiftPalette (unsigned char *palette);
+// called for bonus and pain flashes, and for underwater color changes
+
+void	VID_Init (unsigned char *palette);
+// Called at startup to set up translation tables, takes 256 8 bit RGB values
+// the palette data will go away after the call, so it must be copied off if
+// the video driver will need it again
+
+void	VID_Shutdown (void);
+// Called at shutdown
+
+void	VID_Update (vrect_t *rects);
+// flushes the given rectangles from the view buffer to the screen
+
+int VID_SetMode (int modenum, unsigned char *palette);
+// sets the mode; only used by the Quake engine for resetting to mode 0 (the
+// base mode) on memory allocation failures
+
+void VID_HandlePause (qboolean pause);
+// called only on Win32, when pause happens, so the mouse can be released
+