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      1 /*	$NetBSD: btvar.h,v 1.4 2005/12/11 12:19:20 christos Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * All advertising materials mentioning features or use of this software
     12  * must display the following acknowledgement:
     13  *	This product includes software developed by the University of
     14  *	California, Lawrence Berkeley Laboratory.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  * 3. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  *	@(#)btvar.h	8.2 (Berkeley) 1/21/94
     41  */
     42 
     43 /*
     44  * Brooktree color frame buffer state variables (see btreg.h).
     45  *
     46  * Unfortunately, remarkably little code can be shared between the
     47  * cg3 and cg6 drivers here, as the cg3 registers do longword-ops
     48  * `as expected', but the cg6 ones use only the upper byte.
     49  *
     50  * Still, the software color map manipulation is not completely trivial.
     51  */
     52 union bt_cmap {
     53 	u_char  cm_map[256][3];		/* 256 R/G/B entries */
     54 	u_int   cm_chip[256 * 3 / 4];	/* the way the chip gets loaded */
     55 };
     56 
     57 /*
     58  * Routines in bt_subr.c.
     59  */
     60 int	bt_getcmap(struct fbcmap *, union bt_cmap *, int);
     61 int	bt_putcmap(struct fbcmap *, union bt_cmap *, int);
     62 
     63 /*
     64  * Compute (x / 4) * 3 and (x / 4) * 4.  These are used in turning
     65  * RGB indices (which are in multiples of three) into `chip RGB' values
     66  * (which are in multiples of four).
     67  */
     68 #define	BT_D4M3(x) ((((x) >> 2) << 1) + ((x) >> 2))	/* (x / 4) * 3 */
     69 #define	BT_D4M4(x) ((x) & ~3)				/* (x / 4) * 4 */
     70