1 /* $NetBSD: btvar.h,v 1.1 1995/03/10 01:50:47 gwr 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. All advertising materials mentioning features or use of this software 25 * must display the following acknowledgement: 26 * This product includes software developed by the University of 27 * California, Berkeley and its contributors. 28 * 4. Neither the name of the University nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 * 44 * @(#)btvar.h 8.2 (Berkeley) 1/21/94 45 */ 46 47 /* 48 * Brooktree color frame buffer state variables (see btreg.h). 49 * 50 * Unfortunately, remarkably little code can be shared between the 51 * cg3 and cg6 drivers here, as the cg3 registers do longword-ops 52 * `as expected', but the cg6 ones use only the upper byte. 53 * 54 * Still, the software color map manipulation is not completely trivial. 55 */ 56 union bt_cmap { 57 u_char cm_map[256][3]; /* 256 R/G/B entries */ 58 u_int cm_chip[256 * 3 / 4]; /* the way the chip gets loaded */ 59 }; 60 61 /* 62 * Routines in bt_subr.c. 63 */ 64 int bt_getcmap __P((struct fbcmap *, union bt_cmap *, int)); 65 int bt_putcmap __P((struct fbcmap *, union bt_cmap *, int)); 66 67 /* 68 * Compute (x / 4) * 3 and (x / 4) * 4. These are used in turning 69 * RGB indices (which are in multiples of three) into `chip RGB' values 70 * (which are in multiples of four). 71 */ 72 #define BT_D4M3(x) ((((x) >> 2) << 1) + ((x) >> 2)) /* (x / 4) * 3 */ 73 #define BT_D4M4(x) ((x) & ~3) /* (x / 4) * 4 */ 74