215 lines
6.4 KiB
Groff
215 lines
6.4 KiB
Groff
.\" Copyright (c) 1990, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Systems Programming Group of the University of Utah Computer
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.\" Science Department.
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)grf.4 5.3 (Berkeley) 7/31/91
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.\" $Id: grf.4,v 1.2 1993/08/01 07:56:31 mycroft Exp $
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.\"
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.Dd July 31, 1991
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.Dt GRF 4 hp300
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.Os
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.Sh NAME
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.Nm grf
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.Nd
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.Tn HP
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graphics frame buffer device interface
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.Sh DESCRIPTION
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This is a generic description of the frame buffer device interface.
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The devices to which this applies are the 98544, 98545 and 98547
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Topcat display cards (also known as
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.Tn HP300H
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devices),
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the 98548, 98549 and 98550
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Catseye display cards,
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the 98700
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Gatorbox graphics box,
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the 98720
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Renaissance graphics box,
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and the 98730
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DaVinci graphics box.
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.Pp
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Use of the devices can be effectively approached from two directions.
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The first is through
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.Tn HP-UX
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.Em Starbase
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routines, the second is by direct control in the
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.Bx
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environment.
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In order to use the Starbase libraries,
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code must be compiled in an
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.Tn HP-UX
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environment, either by doing so on an
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.Tn HP-UX
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machine and transferring the binaries to the
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.Bx
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machine, or by compilation
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with the use of the
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.Xr hpux 1
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command.
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Applications using Starbase libraries have been run successfully
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on
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.Bx
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machines using both of these compilation techniques.
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.Pp
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Direct compilation,
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such as that used for the X Window System servers, has also been successful.
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Examples of some frame buffer operations can be found in
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the device dependent X Window system sources, for example the
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.Pa /usr/src/new/X/libhp.fb
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directory. These files contain examples of device dependent color map
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initialization, frame buffer operations, bit moving routines etc.
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.Pp
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The basic programming of the
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.Nm grf Ns ?
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devices involves opening the device
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file, mapping the control registers and frame buffer addresses into user
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space, and then manipulating the device as the application requires.
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The address mapping is controlled by an
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.Xr ioctl 2
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call to map the device into user space, and an unmap call when finished.
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The ioctls supported by
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.Bx
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are:
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.Bl -tag -width indent
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.It Dv GRFIOCGINFO
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Get Graphics Info
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.Pp
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Get info about device, setting the entries in the
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.Em grfinfo
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structure, as defined in <hpdev/grfioctl.h>:
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.Bd -literal
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struct grfinfo {
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int gd_id; /* HPUX identifier */
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caddr_t gd_regaddr; /* control registers physaddr */
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int gd_regsize; /* control registers size */
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caddr_t gd_fbaddr; /* frame buffer physaddr */
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int gd_fbsize; /* frame buffer size */
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short gd_colors; /* number of colors */
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short gd_planes; /* number of planes */
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/* new stuff */
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int gd_fbwidth; /* frame buffer width */
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int gd_fbheight; /* frame buffer height */
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int gd_dwidth; /* displayed part width */
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int gd_dheight; /* displayed part height */
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int gd_pad[6]; /* for future expansion */
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};
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.Ed
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.It Dv GRFIOCON
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Graphics On
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.Pp
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Turn graphics on by enabling
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.Tn CRT
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output. The screen will come on, displaying
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whatever is in the frame buffer, using whatever colormap is in place.
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.It Dv GRFIOCOFF
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Graphics Off
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.Pp
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Turn graphics off by disabling output to the
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.Tn CRT .
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The frame buffer contents
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are not affected.
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.It Dv GRFIOCMAP
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Map Device to user space
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.Pp
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Map in control registers and framebuffer space. Once the device file is
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mapped, the frame buffer structure is accessible.
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.It Dv GRFIOCUNMAP
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Unmap Device
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.Pp
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Unmap control registers and framebuffer space.
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.El
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.Pp
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For further information about the use of ioctl see the man page.
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.Sh EXAMPLE
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This short code fragment is an example of opening some graphics device and
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mapping in the control and frame buffer space:
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.Bd -literal
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#define GRF_DEV <some_graphics_device> /* /dev/grfN */
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{
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struct fbstruct *regs; /* fbstruct = gboxfb, rboxfb, etc. */
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u_char *Addr, frame_buffer;
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struct grfinfo gi;
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int disp_fd;
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disp_fd = open(GRF_DEV,1);
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if (ioctl (disp_fd, GRFIOCGINFO, &gi) < 0) return -1;
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(void) ioctl (disp_fd, GRFIOCON, 0);
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Addr = (u_char *) 0;
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if (ioctl (disp_fd, GRFIOCMAP, &Addr) < 0) {
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(void) ioctl (disp_fd, GRFIOCOFF, 0);
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return -1;
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}
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regs = (fbstruct *) Addr; /* Control Registers */
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frame_buffer = (u_char *) Addr + gi.gd_regsize; /* Frame buffer mem */
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}
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.Ed
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.Sh FILES
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.Bl -tag -width /dev/*crt*? -compact
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.It Pa /dev/grf?
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.Bx
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interface special files
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.It Pa /dev/*crt*
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.Tn HP-UX
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.Em starbase
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interface special files
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.El
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.Sh DIAGNOSTICS
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None under
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.Bx .
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.Tn HP-UX
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The
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.Tn CE.utilities/Crtadjust
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programs must be used for each specific device.
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.Sh ERRORS
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.Bl -tag -width [EINVAL]
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.It Bq Er ENODEV
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no such device.
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.It Bq Er EBUSY
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Another process has the device open.
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.It Bq Er EINVAL
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Invalid ioctl specification.
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.El
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr dv 4 ,
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.Xr gb 4 ,
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.Xr rb 4 ,
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.Xr tc 4 ,
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.Xr hil 4
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.Sh HISTORY
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The
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.Nm
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driver
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.Ud
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