dev/sun/btvar.h

1.3  christos /*	$NetBSD: btvar.h,v 1.3 2005/12/11 12:23:56 christos Exp $ */
1.1        pk
1.1        pk /*
1.1        pk  * Copyright (c) 1993
1.1        pk  *	The Regents of the University of California.  All rights reserved.
1.1        pk  *
1.1        pk  * This software was developed by the Computer Systems Engineering group
1.1        pk  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
1.1        pk  * contributed to Berkeley.
1.1        pk  *
1.1        pk  * All advertising materials mentioning features or use of this software
1.1        pk  * must display the following acknowledgement:
1.1        pk  *	This product includes software developed by the University of
1.1        pk  *	California, Lawrence Berkeley Laboratory.
1.1        pk  *
1.1        pk  * Redistribution and use in source and binary forms, with or without
1.1        pk  * modification, are permitted provided that the following conditions
1.1        pk  * are met:
1.1        pk  * 1. Redistributions of source code must retain the above copyright
1.1        pk  *    notice, this list of conditions and the following disclaimer.
1.1        pk  * 2. Redistributions in binary form must reproduce the above copyright
1.1        pk  *    notice, this list of conditions and the following disclaimer in the
1.1        pk  *    documentation and/or other materials provided with the distribution.
1.2       agc  * 3. Neither the name of the University nor the names of its contributors
1.1        pk  *    may be used to endorse or promote products derived from this software
1.1        pk  *    without specific prior written permission.
1.1        pk  *
1.1        pk  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1.1        pk  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.1        pk  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.1        pk  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1.1        pk  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1.1        pk  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1.1        pk  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.1        pk  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1.1        pk  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1.1        pk  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1.1        pk  * SUCH DAMAGE.
1.1        pk  *
1.1        pk  *	@(#)btvar.h	8.2 (Berkeley) 1/21/94
1.1        pk  */
1.1        pk
1.1        pk /*
1.1        pk  * Brooktree color frame buffer state variables (see btreg.h).
1.1        pk  *
1.1        pk  * Unfortunately, remarkably little code can be shared between the
1.1        pk  * cg3 and cg6 drivers here, as the cg3 registers do longword-ops
1.1        pk  * `as expected', but the cg6 ones use only the upper byte.
1.1        pk  *
1.1        pk  * Still, the software color map manipulation is not completely trivial.
1.1        pk  */
1.1        pk union bt_cmap {
1.1        pk 	u_char  cm_map[256][3];		/* 256 R/G/B entries */
1.1        pk 	u_int   cm_chip[256 * 3 / 4];	/* the way the chip gets loaded */
1.1        pk };
1.1        pk
1.1        pk /*
1.1        pk  * Routines in bt_subr.c.
1.1        pk  */
1.1        pk int	bt_getcmap(struct fbcmap *, union bt_cmap *, int, int);
1.1        pk int	bt_putcmap(struct fbcmap *, union bt_cmap *, int, int);
1.1        pk void	bt_initcmap(union bt_cmap *, int);
1.1        pk
1.1        pk /*
1.1        pk  * Compute (x / 4) * 3 and (x / 4) * 4.  These are used in turning
1.1        pk  * RGB indices (which are in multiples of three) into `chip RGB' values
1.1        pk  * (which are in multiples of four).
1.1        pk  */
1.1        pk #define	BT_D4M3(x) ((((x) >> 2) << 1) + ((x) >> 2))	/* (x / 4) * 3 */
1.1        pk #define	BT_D4M4(x) ((x) & ~3)				/* (x / 4) * 4 */