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umc.c
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umc.c
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/***************************************************************************
* Copyright (C) 2005 by Desmond Colin Jones *
* http://umc.sourceforge.net/ *
* *
* gcc umc.c -o umc -lm -Wall *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
/* cmsj - This isn't even used
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
/* The name by which this program was run. */
char *program_name;
/* Nonzero if a non-fatal error has occurred. */
static int exit_status = EXIT_SUCCESS;
/* define a return variable of type modeline */
typedef struct __UMC_MODELINE
{
/* pixel clock Hz */
double PClock;
/* horizontal modeline variables */
int HRes; //horizontal resolution
int HSyncStart; //horizontal sync start
int HSyncEnd; //horizontal sync end
int HTotal; //horizontal total
/* vertical modeline variables */
int VRes; //vertical resolution
int VSyncStart; //vertical sync start
int VSyncEnd; //vertical sync end
int VTotal; //vertical total
/* parameters */
int Interlace; //boolean (> 0 = yes)
int Doublescan; //boolean (> 0 = yes)
int HSyncPolarity; //boolean (low voltage, high voltage > 0)
int VSyncPolarity; //boolean (low voltage, high voltage > 0)
/* linked list pointers */
struct __UMC_MODELINE *next;
struct __UMC_MODELINE *previous;
} UMC_MODELINE;
/* define an input variable for display timings */
typedef struct __UMC_DISPLAY
{
/* pixel clock parameters */
double CharacterCell; //horizontal character cell granularity
double PClockStep; //pixel clock stepping
/* horizontal blanking time parameters */
double HSyncPercent; //horizontal sync width as % of line period
double M; //M gradient (%/kHz)
double C; //C offset (%)
double K; //K blanking time scaling factor
double J; //J scaling factor weighting
/* vertical blanking time parameters */
double VFrontPorch; //minimum number of lines for front porch
double VBackPorchPlusSync; //minimum time for vertical sync+back porch
double VSyncWidth; //minimum number of lines for vertical sync
double VBackPorch; //minimum number of lines for back porch
/* configuration parameters */
double Margin; //top/bottom MARGIN size as % of height
/* reduced blanking parameters */
double HBlankingTicks; //number of clock ticks for horizontal blanking
double HSyncTicks; //number of clock ticks for horizontal sync
double VBlankingTime; //minimum vertical blanking time
} UMC_DISPLAY;
UMC_DISPLAY UMC_GTF = {
8.0, //horizontal character cell granularity
0.0, //pixel clock stepping
8.0, //horizontal sync width% of line period
600.0, //M gradient (%/kHz)
40.0, //C offset (%)
128.0, //K blanking time scaling factor
20.0, //J scaling factor weighting
1.0, //number of lines for front porch
550.0, //time for vertical sync+back porch
3.0, //number of lines for vertical sync
6.0, //number of lines for back porch
0.0, //top/bottom MARGIN size as % of height
160.0, //clock ticks for horizontal blanking
32.0, //clock ticks for horizontal sync
460.0, //minimum vertical blanking time
};
UMC_DISPLAY UMC_CVT = {
8.0, //horizontal character cell granularity
0.25, //pixel clock stepping
8.0, //horizontal sync width% of line period
600.0, //M gradient (%/kHz)
40.0, //C offset (%)
128.0, //K blanking time scaling factor
20.0, //J scaling factor weighting
3.0, //number of lines for front porch
550.0, //time for vertical sync+back porch
4.0, //number of lines for vertical sync
6.0, //number of lines for back porch
0.0, //top/bottom MARGIN size as % of height
160.0, //clock ticks for horizontal blanking
32.0, //clock ticks for horizontal sync
460.0, //minimum vertical blanking time
};
/* define a round function to keep the source ANSI C 89 compliant */
double round(double input)
{
return ((double) ((int) (input + 0.5)));
}
double floor(double input)
{
return ((double) ((int) input));
}
double ceil(double input)
{
return ((double) ((int) (input + 1.0)));
}
void usage (int status)
{
if (status != EXIT_SUCCESS)
fprintf (stderr,"Try `%s --help' for more information.\n",
program_name);
else
{
printf("Usage: %s x y refresh [OPTIONS]\n", program_name);
printf("Compute a modeline given a resolution and refresh rate.\n\n\
-i, --interlace calculate an interlaced mode\n\
-d, --doublescan calculate a doublescanned mode\n\
-m, --margin margin percentage\n\
-x, --X11R6 print X11R6 modeline format (default)\n\
-f, --fb print fb modeline format\n\
-p, --p96 print Picasso 96 mode format\n\
--help\n\
--version\n\n");
}
exit (status);
} // usage()
UMC_MODELINE *reduced_blanking_timing(double HRes, double VRes,
double RefreshRate, UMC_DISPLAY Display, double Flags)
{
/* define Clock variables */
double PClock = 0;
/* horizontal calculation variables */
double HActive = 0;
double HSyncWidth = 0;
double HBackPorch = 0;
double HTotal = 0;
double HorizontalPeriodEstimate = 0;
/* vertical calculation variables */
double Interlace = 0;
double VBlanking = 0;
double VBackPorch = 0;
double VTotal = 0;
/* Margin variables */
double TopMargin = 0;
double BottomMargin = 0;
double RightMargin = 0;
double LeftMargin = 0;
/* get a return variable */
UMC_MODELINE *Modeline = (UMC_MODELINE*) malloc(sizeof(UMC_MODELINE));
/* perform a very, very small sainity check */
if (Modeline == NULL)
{
fprintf(stderr, "Error: not enough memory available.\n");
return (NULL);
}
if (
(HRes < 1) ||
(VRes < 1) ||
(RefreshRate < 1)
)
{
fprintf(stderr, "Error: mode parameters invalid.\n");
return (NULL);
}
/* initialize a few Modeline variables to their default values */
Modeline->Doublescan = 0;
Modeline->Interlace = 0;
Modeline->next = NULL;
Modeline->previous = NULL;
/* round character cell granularity to nearest integer*/
Display.CharacterCell = floor(Display.CharacterCell);
if (Display.CharacterCell < 1)
{
fprintf(stderr, "Error: character cell less than 1 pixel.\n");
}
/* round number of lines in front porch to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VFrontPorch = round(Display.VFrontPorch / 2.0) * 2.0;
}
else
{
Display.VFrontPorch = floor(Display.VFrontPorch);
}
if (Display.VFrontPorch < 0)
{
fprintf(stderr, "Error: vertical sync start less than 0 lines.\n");
}
/* round number of lines in vsync width to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VSyncWidth = round(Display.VSyncWidth / 2.0) * 2.0;
}
else
{
Display.VSyncWidth = floor(Display.VSyncWidth);
}
if (Display.VSyncWidth < 1)
{
fprintf(stderr, "Error: vertical sync width less than 1 line.\n");
}
/* round number of lines in back porch to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VBackPorch= round(Display.VBackPorch / 2.0) * 2.0;
}
else
{
Display.VBackPorch = floor(Display.VBackPorch);
}
if (Display.VBackPorch < 1)
{
fprintf(stderr, "Error: vertical sync width less than 1 line.\n");
}
/* number of lines per field rounded to nearest integer */
if (Flags > 0) // if interlace mode
{
VRes = floor(VRes / 2.0);
}
else if (Flags < 0) // if doublescan mode
{
VRes = floor(VRes) * 2;
}
else
{
VRes = floor(VRes);
}
/* round horizontal resolution to lowest character cell multiple */
HRes = floor(HRes / Display.CharacterCell) * Display.CharacterCell;
/* round horizontal blanking to lowest character cell multiple */
Display.HBlankingTicks =
floor(Display.HBlankingTicks / Display.CharacterCell) *
Display.CharacterCell;
/* round horizontal sync to lowest character cell multiple */
Display.HSyncTicks =
floor(Display.HSyncTicks / Display.CharacterCell) *
Display.CharacterCell;
/* calculate margins */
if (Display.Margin > 0)
{
/* calculate top and bottom margins */
TopMargin = BottomMargin = floor((Display.Margin / 100.0) * VRes);
/* calculate left and right margins */
LeftMargin = RightMargin =
floor(HRes * (Display.Margin / 100.0) / Display.CharacterCell) *
Display.CharacterCell;
}
/* calculate total number of active pixels per line */
HActive = HRes + LeftMargin + RightMargin;
/* set interlace variable if interlace mode */
if (Flags > 0) // if interlace mode
{
Interlace = 0.5;
}
else
{
Interlace = 0;
}
/* calculate field refresh rate */
if (Flags > 0) // if interlace mode
{
RefreshRate = RefreshRate * 2.0;
}
/* estimate horizontal period */
HorizontalPeriodEstimate =
((1000000.0 / RefreshRate) - Display.VBlankingTime) /
(VRes + TopMargin + BottomMargin);
/* calculate number of lines in vertical sync and back porch */
VBlanking = Display.VBlankingTime / HorizontalPeriodEstimate;
if (Flags < 0) // if doublescan mode
{
VBlanking = ceil(VBlanking / 2.0) * 2.0;
}
else // default
{
VBlanking = ceil(VBlanking);
}
if (VBlanking <
Display.VFrontPorch + Display.VSyncWidth + Display.VBackPorch)
{
VBlanking =
Display.VFrontPorch + Display.VSyncWidth + Display.VBackPorch;
}
/* calculate number of lines in back porch */
VBackPorch = VBlanking - Display.VSyncWidth - Display.VFrontPorch;
/* calculate total number of lines */
VTotal = VRes + TopMargin + BottomMargin + VBlanking + Interlace;
/* calculate total number of pixels per line */
HTotal = HActive + Display.HBlankingTicks;
/* calculate pixel clock */
PClock = RefreshRate * VTotal * HTotal / 1000000.0;
if (Display.PClockStep > 0)
{
PClock = floor(PClock / Display.PClockStep) * Display.PClockStep;
}
/* calculate horizontal sync width in pixels */
HSyncWidth = Display.HSyncTicks;
/* calculate horizontal back porch in pixels */
HBackPorch = Display.HBlankingTicks / 2.0;
/* output modeline calculations */
if (Flags > 0) // if interlace mode
{
Modeline->Interlace = 1;
Modeline->PClock = PClock;
Modeline->HRes = (int) HRes;
Modeline->HSyncStart = (int) (HTotal - HBackPorch - HSyncWidth);
Modeline->HSyncEnd = (int) (HTotal - HBackPorch);
Modeline->HTotal = (int) HTotal;
Modeline->VRes = (int) (VRes * 2.0);
Modeline->VSyncStart =
(int) ((VTotal - VBackPorch - Display.VSyncWidth) * 2.0);
Modeline->VSyncEnd = (int) ((VTotal - VBackPorch) * 2.0);
Modeline->VTotal = (int) (VTotal * 2.0);
}
else if (Flags < 0) // if doublescan mode
{
Modeline->Doublescan = 1;
Modeline->PClock = PClock;
Modeline->HRes = (int) HRes;
Modeline->HSyncStart = (int) (HTotal - HBackPorch - HSyncWidth);
Modeline->HSyncEnd = (int) (HTotal - HBackPorch);
Modeline->HTotal = (int) HTotal;
Modeline->VRes = (int) (VRes / 2.0);
Modeline->VSyncStart =
(int) ((VTotal - VBackPorch - Display.VSyncWidth) / 2.0);
Modeline->VSyncEnd = (int) ((VTotal - VBackPorch) / 2.0);
Modeline->VTotal = (int) (VTotal / 2.0);
}
else
{
Modeline->PClock = PClock;
Modeline->HRes = (int) HRes;
Modeline->HSyncStart = (int) (HTotal - HBackPorch - HSyncWidth);
Modeline->HSyncEnd = (int) (HTotal - HBackPorch);
Modeline->HTotal = (int) HTotal;
Modeline->VRes = (int) VRes;
Modeline->VSyncStart = (int) (VTotal - VBackPorch - Display.VSyncWidth);
Modeline->VSyncEnd = (int) (VTotal - VBackPorch);
Modeline->VTotal = (int) VTotal;
}
Modeline->HSyncPolarity = 1;
Modeline->VSyncPolarity = 0;
return (Modeline);
} // reduced_blanking_timing()
UMC_MODELINE *coordinated_video_timing(double HRes, double VRes,
double RefreshRate, UMC_DISPLAY Display, double Flags)
{
/* define Clock variables */
double PClock = 0;
/* horizontal calculation variables */
double HActive = 0;
double HSyncWidth = 0;
double HBackPorch = 0;
double HTotal = 0;
double IdealDutyCycle = 0;
double HorizontalPeriodEstimate = 0;
double HorizontalBlankingPixels = 0;
/* vertical calculation variables */
double Interlace = 0;
double VSyncPlusBackPorch = 0;
double VBackPorch = 0;
double VTotal = 0;
/* Margin variables */
double TopMargin = 0;
double BottomMargin = 0;
double RightMargin = 0;
double LeftMargin = 0;
/* get a return variable */
UMC_MODELINE *Modeline = (UMC_MODELINE*) malloc(sizeof(UMC_MODELINE));
/* perform a very, very small sainity check */
if (Modeline == NULL)
{
fprintf(stderr, "Error: not enough memory available.\n");
return (NULL);
}
if (
(HRes < 1) ||
(VRes < 1) ||
(RefreshRate < 1)
)
{
fprintf(stderr, "Error: mode parameters invalid.\n");
return (NULL);
}
/* initialize a few Modeline variables to their default values */
Modeline->Doublescan = 0;
Modeline->Interlace = 0;
Modeline->next = NULL;
Modeline->previous = NULL;
/* round character cell granularity to nearest integer*/
Display.CharacterCell = floor(Display.CharacterCell);
if (Display.CharacterCell < 1)
{
fprintf(stderr, "Error: character cell less than 1 pixel.\n");
}
/* round number of lines in front porch to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VFrontPorch = round(Display.VFrontPorch / 2.0) * 2.0;
}
else
{
Display.VFrontPorch = floor(Display.VFrontPorch);
}
if (Display.VFrontPorch < 0)
{
fprintf(stderr, "Error: vertical sync start less than 0 lines.\n");
}
/* round number of lines in vsync width to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VSyncWidth = round(Display.VSyncWidth / 2.0) * 2.0;
}
else
{
Display.VSyncWidth = floor(Display.VSyncWidth);
}
if (Display.VSyncWidth < 1)
{
fprintf(stderr, "Error: vertical sync width less than 1 line.\n");
}
/* round number of lines in back porch to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VBackPorch= round(Display.VBackPorch / 2.0) * 2.0;
}
else
{
Display.VBackPorch = floor(Display.VBackPorch);
}
if (Display.VBackPorch < 1)
{
fprintf(stderr, "Error: vertical sync width less than 1 line.\n");
}
/* Calculate M, incorporating the scaling factor */
if (Display.K == 0)
{
Display.K = 00.1;
}
Display.M = (Display.K / 256.0) * Display.M;
/* Calculate C, incorporating the scaling factor */
Display.C = ((Display.C - Display.J) * Display.K / 256.0) + Display.J;
/* number of lines per field rounded to nearest integer */
if (Flags > 0) // if interlace mode
{
VRes = floor(VRes / 2.0);
}
else if (Flags < 0) // if doublescan mode
{
VRes = floor(VRes) * 2;
}
else
{
VRes = floor(VRes);
}
/* number of pixels per line rouned to nearest character cell */
HRes = floor(HRes / Display.CharacterCell) * Display.CharacterCell;
/* calculate margins */
if (Display.Margin > 0)
{
/* calculate top and bottom margins */
TopMargin = BottomMargin = floor((Display.Margin / 100.0) * VRes);
/* calculate left and right margins */
LeftMargin = RightMargin =
floor(HRes * (Display.Margin / 100.0) / Display.CharacterCell) *
Display.CharacterCell;
}
/* calculate total number of active pixels per line */
HActive = HRes + LeftMargin + RightMargin;
/* set interlace variable if interlace mode */
if (Flags > 0) // if interlace mode
{
Interlace = 0.5;
}
else
{
Interlace = 0;
}
/* calculate field refresh rate */
if (Flags > 0) // if interlace mode
{
RefreshRate = RefreshRate * 2.0;
}
/* estimate horizontal period */
HorizontalPeriodEstimate =
((1.0 / RefreshRate) - Display.VBackPorchPlusSync / 1000000.0) /
(VRes + TopMargin + BottomMargin + Display.VFrontPorch + Interlace) *
1000000.0;
/* calculate number of lines in vertical sync and back porch */
VSyncPlusBackPorch = Display.VBackPorchPlusSync / HorizontalPeriodEstimate;
if (Flags < 0) // if doublescan mode
{
VSyncPlusBackPorch = ceil(VSyncPlusBackPorch / 2.0) * 2.0;
}
else // default
{
VSyncPlusBackPorch = ceil(VSyncPlusBackPorch);
}
if (VSyncPlusBackPorch < Display.VSyncWidth + Display.VBackPorch)
{
VSyncPlusBackPorch = Display.VSyncWidth + Display.VBackPorch;
}
/* calculate number of lines in back porch */
VBackPorch = VSyncPlusBackPorch - Display.VSyncWidth;
/* calculate total number of lines */
VTotal =
VRes + TopMargin + BottomMargin +
Display.VFrontPorch + VSyncPlusBackPorch + Interlace;
/* calculate ideal duty cycle */
IdealDutyCycle =
Display.C - (Display.M * HorizontalPeriodEstimate / 1000.0);
/* calculate horizontal blanking time in pixels */
if (IdealDutyCycle < 20)
{
HorizontalBlankingPixels =
floor((HActive * 20.0) / (100.0 - 20.0) /
(2.0 * Display.CharacterCell)) * 2.0 * Display.CharacterCell;
}
else
{
HorizontalBlankingPixels =
floor(HActive * IdealDutyCycle / (100.0 - IdealDutyCycle) /
(2.0 * Display.CharacterCell)) * 2.0 * Display.CharacterCell;
}
/* calculate total number of pixels per line */
HTotal = HActive + HorizontalBlankingPixels;
/* calculate pixel clock */
if (Display.PClockStep > 0)
{
PClock =
floor(HTotal / HorizontalPeriodEstimate / Display.PClockStep) *
Display.PClockStep;
}
else
{
PClock = HTotal / HorizontalPeriodEstimate;
}
/* calculate horizontal sync width in pixels */
HSyncWidth =
round(Display.HSyncPercent / 100.0 * HTotal / Display.CharacterCell) *
Display.CharacterCell;
/* calculate horizontal back porch in pixels */
HBackPorch = HorizontalBlankingPixels / 2.0;
/* output modeline calculations */
if (Flags > 0) // if interlace mode
{
Modeline->Interlace = 1;
Modeline->PClock = PClock;
Modeline->HRes = (int) HRes;
Modeline->HSyncStart = (int) (HTotal - HBackPorch - HSyncWidth);
Modeline->HSyncEnd = (int) (HTotal - HBackPorch);
Modeline->HTotal = (int) HTotal;
Modeline->VRes = (int) (VRes * 2.0);
Modeline->VSyncStart = (int) ((VTotal - VSyncPlusBackPorch) * 2.0);
Modeline->VSyncEnd = (int) ((VTotal - VBackPorch) * 2.0);
Modeline->VTotal = (int) (VTotal * 2.0);
}
else if (Flags < 0) // if doublescan mode
{
Modeline->Doublescan = 1;
Modeline->PClock = PClock;
Modeline->HRes = (int) HRes;
Modeline->HSyncStart = (int) (HTotal - HBackPorch - HSyncWidth);
Modeline->HSyncEnd = (int) (HTotal - HBackPorch);
Modeline->HTotal = (int) HTotal;
Modeline->VRes = (int) (VRes / 2.0);
Modeline->VSyncStart = (int) ((VTotal - VSyncPlusBackPorch) / 2.0);
Modeline->VSyncEnd = (int) ((VTotal - VBackPorch) / 2.0);
Modeline->VTotal = (int) (VTotal / 2.0);
}
else
{
Modeline->PClock = PClock;
Modeline->HRes = (int) HRes;
Modeline->HSyncStart = (int) (HTotal - HBackPorch - HSyncWidth);
Modeline->HSyncEnd = (int) (HTotal - HBackPorch);
Modeline->HTotal = (int) HTotal;
Modeline->VRes = (int) VRes;
Modeline->VSyncStart = (int) (VTotal - VSyncPlusBackPorch);
Modeline->VSyncEnd = (int) (VTotal - VBackPorch);
Modeline->VTotal = (int) VTotal;
}
Modeline->HSyncPolarity = 0;
Modeline->VSyncPolarity = 1;
return (Modeline);
} // coordinated_video_timing()
UMC_MODELINE *general_timing_formula(double HRes, double VRes, double Clock,
UMC_DISPLAY Display, double Flags)
{
/* define Clock variables */
double RefreshRate = 0;
double RefreshRateEstimate = 0;
double HClock = 0;
double PClock = 0;
/* horizontal calculation variables */
double HActive = 0;
double HSyncWidth = 0;
double HBackPorch = 0;
double HTotal = 0;
double IdealDutyCycle = 0;
double HorizontalPeriodEstimate = 0;
double IdealHorizontalPeriod = 0;
double HorizontalPeriod = 0;
double HorizontalBlankingPixels = 0;
/* vertical calculation variables */
double Interlace = 0;
double VSyncPlusBackPorch = 0;
double VBackPorch = 0;
double VTotal = 0;
/* Margin variables */
double TopMargin = 0;
double BottomMargin = 0;
double RightMargin = 0;
double LeftMargin = 0;
/* get a return variable */
UMC_MODELINE *Modeline = (UMC_MODELINE*) malloc(sizeof(UMC_MODELINE));
/* perform a very, very small sainity check */
if (Modeline == NULL)
{
fprintf(stderr, "Error: not enough memory available.\n");
return (NULL);
}
if (
(HRes < 1) ||
(VRes < 1) ||
(Clock < 1)
)
{
fprintf(stderr, "Error: mode parameters invalid.\n");
return (NULL);
}
/* initialize a few Modeline variables to their default values */
Modeline->Doublescan = 0;
Modeline->Interlace = 0;
Modeline->next = NULL;
Modeline->previous = NULL;
/* round character cell granularity to nearest integer*/
Display.CharacterCell = round(Display.CharacterCell);
if (Display.CharacterCell < 1)
{
fprintf(stderr, "Error: character cell less than 1 pixel.\n");
}
/* round number of lines in front porch to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VFrontPorch = round(Display.VFrontPorch / 2.0) * 2.0;
}
else
{
Display.VFrontPorch = floor(Display.VFrontPorch);
}
if (Display.VFrontPorch < 0)
{
fprintf(stderr, "Error: vertical sync start less than 0 lines.\n");
}
/* round number of lines in vsync width to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VSyncWidth = round(Display.VSyncWidth / 2.0) * 2.0;
}
else
{
Display.VSyncWidth = round(Display.VSyncWidth);
}
if (Display.VSyncWidth < 1)
{
fprintf(stderr, "Error: vertical sync width less than 1 line.\n");
}
/* round number of lines in back porch to nearest integer */
if (Flags < 0) // if doublescan mode
{
Display.VBackPorch= round(Display.VBackPorch / 2.0) * 2.0;
}
else
{
Display.VBackPorch = round(Display.VBackPorch);
}
if (Display.VBackPorch < 1)
{
fprintf(stderr, "Error: vertical sync width less than 1 line.\n");
}
/* Calculate M, incorporating the scaling factor */
if (Display.K == 0)
{
Display.K = 00.1;
}
Display.M = (Display.K / 256.0) * Display.M;
/* Calculate C, incorporating the scaling factor */
Display.C = ((Display.C - Display.J) * Display.K / 256.0) + Display.J;
/* number of lines per field rounded to nearest integer */
if (Flags > 0) // if interlace mode
{
VRes = round(VRes / 2.0);
}
else if (Flags < 0) // if doublescan mode
{
VRes = round(VRes) * 2;
}
else
{
VRes = round(VRes);
}
/* number of pixels per line rouned to nearest character cell */
HRes = round(HRes / Display.CharacterCell) * Display.CharacterCell;
/* calculate margins */
if (Display.Margin > 0)
{
/* calculate top and bottom margins */
TopMargin = BottomMargin = round((Display.Margin / 100.0) * VRes);
/* calculate left and right margins */
LeftMargin = RightMargin =
round(HRes * (Display.Margin / 100.0) / Display.CharacterCell) *
Display.CharacterCell;
}
/* calculate total number of active pixels per line */
HActive = HRes + LeftMargin + RightMargin;
/* set interlace variable if interlace mode */
if (Flags > 0) // if interlace mode
{
Interlace = 0.5;
}
else
{
Interlace = 0;
}
/***************************************************************************
* *
* Refresh rate driven calculations. *
* *
***************************************************************************/
if (Clock < 1000)
{
RefreshRate = Clock;
/* calculate field refresh rate */
if (Flags > 0) // if interlace mode
{
RefreshRate = RefreshRate * 2.0;
}
/* estimate horizontal period */
HorizontalPeriodEstimate =
((1.0 / RefreshRate) - Display.VBackPorchPlusSync / 1000000.0) /
(VRes + TopMargin + BottomMargin + Display.VFrontPorch + Interlace) *
1000000.0;
/* calculate number of lines in vertical sync and back porch */
VSyncPlusBackPorch =
Display.VBackPorchPlusSync / HorizontalPeriodEstimate;
if (Flags < 0) // if doublescan mode
{
VSyncPlusBackPorch = round(VSyncPlusBackPorch / 2.0) * 2.0;
}
else // default
{
VSyncPlusBackPorch = round(VSyncPlusBackPorch);
}
/***************************************************************************
* *
* The following reality check was not a part of the gtf worksheet but *
* it should have been, which is why I included it. *
* *
****************************************************************************/
if (VSyncPlusBackPorch < Display.VSyncWidth + Display.VBackPorch)
{
VSyncPlusBackPorch = Display.VSyncWidth + Display.VBackPorch;
}
/* calculate number of lines in back porch */
VBackPorch = VSyncPlusBackPorch - Display.VSyncWidth;
/* calculate total number of lines */
VTotal =
VRes + TopMargin + BottomMargin +
Display.VFrontPorch + VSyncPlusBackPorch + Interlace;
/* estimate field refresh rate*/
RefreshRateEstimate =