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