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