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.\" Copyright (c) 1990, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Systems Programming Group of the University of Utah Computer
.\" Science Department.
.\" 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. 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, Berkeley and its contributors.
.\" 4. 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.
.\"
.\" from: @(#)grf.4 5.3 (Berkeley) 7/31/91
.\" $Id: grf.4,v 1.1 1995/10/18 08:44:28 deraadt Exp $
.\"
.Dd July 31, 1991
.Dt GRF 4 hp300
.Os
.Sh NAME
.Nm grf
.Nd
.Tn HP
graphics frame buffer device interface
.Sh DESCRIPTION
This is a generic description of the frame buffer device interface.
The devices to which this applies are the 98544, 98545 and 98547
Topcat display cards (also known as
.Tn HP300H
devices),
the 98548, 98549 and 98550
Catseye display cards,
the 98700
Gatorbox graphics box,
the 98720
Renaissance graphics box,
and the 98730
DaVinci graphics box.
.Pp
Use of the devices can be effectively approached from two directions.
The first is through
.Tn HP-UX
.Em Starbase
routines, the second is by direct control in the
.Bx
environment.
In order to use the Starbase libraries,
code must be compiled in an
.Tn HP-UX
environment, either by doing so on an
.Tn HP-UX
machine and transferring the binaries to the
.Bx
machine, or by compilation
with the use of the
.Xr hpux 1
command.
Applications using Starbase libraries have been run successfully
on
.Bx
machines using both of these compilation techniques.
.Pp
Direct compilation,
such as that used for the X Window System servers, has also been successful.
Examples of some frame buffer operations can be found in
the device dependent X Window system sources, for example the
.Pa /usr/src/new/X/libhp.fb
directory. These files contain examples of device dependent color map
initialization, frame buffer operations, bit moving routines etc.
.Pp
The basic programming of the
.Nm grf Ns ?
devices involves opening the device
file, mapping the control registers and frame buffer addresses into user
space, and then manipulating the device as the application requires.
The address mapping is controlled by an
.Xr ioctl 2
call to map the device into user space, and an unmap call when finished.
The ioctls supported by
.Bx
are:
.Bl -tag -width indent
.It Dv GRFIOCGINFO
Get Graphics Info
.Pp
Get info about device, setting the entries in the
.Em grfinfo
structure, as defined in <hpdev/grfioctl.h>:
.Bd -literal
struct grfinfo {
int gd_id; /* HPUX identifier */
caddr_t gd_regaddr; /* control registers physaddr */
int gd_regsize; /* control registers size */
caddr_t gd_fbaddr; /* frame buffer physaddr */
int gd_fbsize; /* frame buffer size */
short gd_colors; /* number of colors */
short gd_planes; /* number of planes */
/* new stuff */
int gd_fbwidth; /* frame buffer width */
int gd_fbheight; /* frame buffer height */
int gd_dwidth; /* displayed part width */
int gd_dheight; /* displayed part height */
int gd_pad[6]; /* for future expansion */
};
.Ed
.It Dv GRFIOCON
Graphics On
.Pp
Turn graphics on by enabling
.Tn CRT
output. The screen will come on, displaying
whatever is in the frame buffer, using whatever colormap is in place.
.It Dv GRFIOCOFF
Graphics Off
.Pp
Turn graphics off by disabling output to the
.Tn CRT .
The frame buffer contents
are not affected.
.It Dv GRFIOCMAP
Map Device to user space
.Pp
Map in control registers and framebuffer space. Once the device file is
mapped, the frame buffer structure is accessible.
.It Dv GRFIOCUNMAP
Unmap Device
.Pp
Unmap control registers and framebuffer space.
.El
.Pp
For further information about the use of ioctl see the man page.
.Sh EXAMPLE
This short code fragment is an example of opening some graphics device and
mapping in the control and frame buffer space:
.Bd -literal
#define GRF_DEV <some_graphics_device> /* /dev/grfN */
{
struct fbstruct *regs; /* fbstruct = gboxfb, rboxfb, etc. */
u_char *Addr, frame_buffer;
struct grfinfo gi;
int disp_fd;
disp_fd = open(GRF_DEV,1);
if (ioctl (disp_fd, GRFIOCGINFO, &gi) < 0) return -1;
(void) ioctl (disp_fd, GRFIOCON, 0);
Addr = (u_char *) 0;
if (ioctl (disp_fd, GRFIOCMAP, &Addr) < 0) {
(void) ioctl (disp_fd, GRFIOCOFF, 0);
return -1;
}
regs = (fbstruct *) Addr; /* Control Registers */
frame_buffer = (u_char *) Addr + gi.gd_regsize; /* Frame buffer mem */
}
.Ed
.Sh FILES
.Bl -tag -width /dev/*crt*? -compact
.It Pa /dev/grf?
.Bx
interface special files
.It Pa /dev/*crt*
.Tn HP-UX
.Em starbase
interface special files
.El
.Sh DIAGNOSTICS
None under
.Bx .
.Tn HP-UX
The
.Tn CE.utilities/Crtadjust
programs must be used for each specific device.
.Sh ERRORS
.Bl -tag -width [EINVAL]
.It Bq Er ENODEV
no such device.
.It Bq Er EBUSY
Another process has the device open.
.It Bq Er EINVAL
Invalid ioctl specification.
.El
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr dv 4 ,
.Xr gb 4 ,
.Xr rb 4 ,
.Xr tc 4 ,
.Xr hil 4
.Sh HISTORY
The
.Nm
driver
.Ud
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