6594783dbb
This allows one to query monitors (or use BIOS EDID data) and learn their default modes, etc. To use this, pass an EDID data block edid_parse(), and get back nicely parsed data, including precalculated modes using GTF, etc. The result can be printed using edid_print(). Also, if you want to use GTF to generate modes without EDID, you can use the vesagtf pseudo-device. vesagtf.c can also be compiled as a standalone program to generate XFree86 modelines.
86 lines
3.4 KiB
C
86 lines
3.4 KiB
C
/* $NetBSD: vesagtf.h,v 1.1 2006/05/11 01:49:53 gdamore Exp $ */
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/*-
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* Copyright (c) 2006 Itronix Inc.
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* All rights reserved.
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*
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* Written by Garrett D'Amore for Itronix Inc.
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*
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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. The name of Itronix Inc. may not be used to endorse
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* or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _DEV_VIDEOMODE_VESAGTF_H
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#define _DEV_VIDEOMODE_VESAGTF_H
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/*
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* Use VESA GTF formula to generate a monitor mode, given resolution and
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* refresh rates.
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*/
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struct vesagtf_params {
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unsigned margin_ppt; /* vertical margin size, percent * 10
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* think parts-per-thousand */
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unsigned min_porch; /* minimum front porch */
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unsigned vsync_rqd; /* width of vsync in lines */
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unsigned hsync_pct; /* hsync as % of total width */
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unsigned min_vsbp; /* minimum vsync + back porch (usec) */
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unsigned M; /* blanking formula gradient */
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unsigned C; /* blanking formula offset */
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unsigned K; /* blanking formula scaling factor */
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unsigned J; /* blanking formula scaling factor */
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};
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/*
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* Default values to use for params.
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*/
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#define VESAGTF_MARGIN_PPT 18 /* 1.8% */
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#define VESAGTF_MIN_PORCH 1 /* minimum front porch */
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#define VESAGTF_VSYNC_RQD 3 /* vsync width in lines */
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#define VESAGTF_HSYNC_PCT 8 /* width of hsync % of total line */
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#define VESAGTF_MIN_VSBP 550 /* min vsync + back porch (usec) */
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#define VESAGTF_M 600 /* blanking formula gradient */
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#define VESAGTF_C 40 /* blanking formula offset */
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#define VESAGTF_K 128 /* blanking formula scaling factor */
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#define VESAGTF_J 20 /* blanking formula scaling factor */
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/*
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* Use VESA GTF formula to generate monitor timings. Assumes default
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* GTF parameters, non-interlaced, and no margins.
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*/
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void vesagtf_mode(unsigned x, unsigned y, unsigned refresh,
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struct videomode *);
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/*
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* A more complete version, in case we ever want to use alternate GTF
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* parameters. EDID 1.3 allows for "secondary GTF parameters".
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*/
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void vesagtf_mode_params(unsigned x, unsigned y, unsigned refresh,
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struct vesagtf_params *, int flags, struct videomode *);
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#define VESAGTF_FLAG_ILACE 0x0001 /* use interlace */
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#define VESAGTF_FLAG_MARGINS 0x0002 /* use margins */
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#endif /* _DEV_VIDEOMODE_VESAGTF_H */
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