sys/arch/sun3/dev/btvar.h

   1 /*      $NetBSD: btvar.h,v 1.1.68.4 2005/01/24 08:34:47 skrll 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 */