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Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/common/gtfcalc.c')
| -rw-r--r-- | board/MAI/bios_emulator/scitech/src/common/gtfcalc.c | 436 |
1 files changed, 0 insertions, 436 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/common/gtfcalc.c b/board/MAI/bios_emulator/scitech/src/common/gtfcalc.c deleted file mode 100644 index 1d547e9abb..0000000000 --- a/board/MAI/bios_emulator/scitech/src/common/gtfcalc.c +++ /dev/null @@ -1,436 +0,0 @@ -/**************************************************************************** -* -* VESA Generalized Timing Formula (GTF) -* Version 1.1 -* -* ======================================================================== -* -* The contents of this file are subject to the SciTech MGL Public -* License Version 1.0 (the "License"); you may not use this file -* except in compliance with the License. You may obtain a copy of -* the License at http://www.scitechsoft.com/mgl-license.txt -* -* Software distributed under the License is distributed on an -* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or -* implied. See the License for the specific language governing -* rights and limitations under the License. -* -* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc. -* -* The Initial Developer of the Original Code is SciTech Software, Inc. -* All Rights Reserved. -* -* ======================================================================== -* -* Developed by: SciTech Software, Inc. -* -* Language: ANSI C -* Environment: Any. -* -* Description: C module for generating GTF compatible timings given a set -* of input requirements. Translated from the original GTF -* 1.14 spreadsheet definition. -* -* Compile with #define TESTING to build a command line test -* program. -* -* NOTE: The code in here has been written for clarity and -* to follow the original GTF spec as closely as -* possible. -* -****************************************************************************/ - -#include "gtf.h" -#ifndef __WIN32_VXD__ -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <ctype.h> -#include <math.h> -#endif - -/*------------------------- Global Variables ------------------------------*/ - -static GTF_constants GC = { - 1.8, /* Margin size as percentage of display */ - 8, /* Character cell granularity */ - 1, /* Minimum front porch in lines/chars */ - 3, /* Width of V sync in lines */ - 8, /* Width of H sync as percent of total */ - 550, /* Minimum vertical sync + back porch (us) */ - 600, /* Blanking formula gradient */ - 40, /* Blanking formula offset */ - 128, /* Blanking formula scaling factor */ - 20, /* Blanking formula scaling factor weight */ - }; - -/*-------------------------- Implementation -------------------------------*/ - -#ifdef __WIN32_VXD__ -/* These functions are not supported in a VxD, so we stub them out so this - * module will at least compile. Calling the functions in here will do - * something wierd! - */ -double sqrt(double x) -{ return x; } - -double floor(double x) -{ return x; } - -double pow(double x,double y) -{ return x*y; } -#endif - -static double round(double v) -{ - return floor(v + 0.5); -} - -static void GetInternalConstants(GTF_constants *c) -/**************************************************************************** -* -* Function: GetInternalConstants -* Parameters: c - Place to store the internal constants -* -* Description: Calculates the rounded, internal set of GTF constants. -* These constants are different to the real GTF constants -* that can be set up for the monitor. The calculations to -* get these real constants are defined in the 'Work Area' -* after the constants are defined in the Excel spreadsheet. -* -****************************************************************************/ -{ - c->margin = GC.margin; - c->cellGran = round(GC.cellGran); - c->minPorch = round(GC.minPorch); - c->vSyncRqd = round(GC.vSyncRqd); - c->hSync = GC.hSync; - c->minVSyncBP = GC.minVSyncBP; - if (GC.k == 0) - c->k = 0.001; - else - c->k = GC.k; - c->m = (c->k / 256) * GC.m; - c->c = (GC.c - GC.j) * (c->k / 256) + GC.j; - c->j = GC.j; -} - -void GTF_calcTimings(double hPixels,double vLines,double freq, - int type,ibool wantMargins,ibool wantInterlace,GTF_timings *t) -/**************************************************************************** -* -* Function: GTF_calcTimings -* Parameters: hPixels - X resolution -* vLines - Y resolution -* freq - Frequency (Hz, KHz or MHz depending on type) -* type - 1 - vertical, 2 - horizontal, 3 - dot clock -* margins - True if margins should be generated -* interlace - True if interlaced timings to be generated -* t - Place to store the resulting timings -* -* Description: Calculates a set of GTF timing parameters given a specified -* resolution and vertical frequency. The horizontal frequency -* and dot clock will be automatically generated by this -* routines. -* -* For interlaced modes the CRTC parameters are calculated for -* a single field, so will be half what would be used in -* a non-interlaced mode. -* -****************************************************************************/ -{ - double interlace,vFieldRate,hPeriod; - double topMarginLines,botMarginLines; - double leftMarginPixels,rightMarginPixels; - double hPeriodEst,vSyncBP,vBackPorch; - double vTotalLines,vFieldRateEst; - double hTotalPixels,hTotalActivePixels,hBlankPixels; - double idealDutyCycle,hSyncWidth,hSyncBP,hBackPorch; - double idealHPeriod; - double vFreq,hFreq,dotClock; - GTF_constants c; - - /* Get rounded GTF constants used for internal calculations */ - GetInternalConstants(&c); - - /* Move input parameters into appropriate variables */ - vFreq = hFreq = dotClock = freq; - - /* Round pixels to character cell granularity */ - hPixels = round(hPixels / c.cellGran) * c.cellGran; - - /* For interlaced mode halve the vertical parameters, and double - * the required field refresh rate. - */ - vFieldRate = vFreq; - interlace = 0; - if (wantInterlace) - dotClock *= 2; - - /* Determine the lines for margins */ - if (wantMargins) { - topMarginLines = round(c.margin / 100 * vLines); - botMarginLines = round(c.margin / 100 * vLines); - } - else { - topMarginLines = 0; - botMarginLines = 0; - } - - if (type != GTF_lockPF) { - if (type == GTF_lockVF) { - /* Estimate the horizontal period */ - hPeriodEst = ((1/vFieldRate) - (c.minVSyncBP/1000000)) / - (vLines + (2*topMarginLines) + c.minPorch + interlace) * 1000000; - - /* Find the number of lines in vSync + back porch */ - vSyncBP = round(c.minVSyncBP / hPeriodEst); - } - else if (type == GTF_lockHF) { - /* Find the number of lines in vSync + back porch */ - vSyncBP = round((c.minVSyncBP * hFreq) / 1000); - } - - /* Find the number of lines in the V back porch alone */ - vBackPorch = vSyncBP - c.vSyncRqd; - - /* Find the total number of lines in the vertical period */ - vTotalLines = vLines + topMarginLines + botMarginLines + vSyncBP - + interlace + c.minPorch; - - if (type == GTF_lockVF) { - /* Estimate the vertical frequency */ - vFieldRateEst = 1000000 / (hPeriodEst * vTotalLines); - - /* Find the actual horizontal period */ - hPeriod = (hPeriodEst * vFieldRateEst) / vFieldRate; - - /* Find the actual vertical field frequency */ - vFieldRate = 1000000 / (hPeriod * vTotalLines); - } - else if (type == GTF_lockHF) { - /* Find the actual vertical field frequency */ - vFieldRate = (hFreq / vTotalLines) * 1000; - } - } - - /* Find the number of pixels in the left and right margins */ - if (wantMargins) { - leftMarginPixels = round(hPixels * c.margin) / (100 * c.cellGran); - rightMarginPixels = round(hPixels * c.margin) / (100 * c.cellGran); - } - else { - leftMarginPixels = 0; - rightMarginPixels = 0; - } - - /* Find the total number of active pixels in image + margins */ - hTotalActivePixels = hPixels + leftMarginPixels + rightMarginPixels; - - if (type == GTF_lockVF) { - /* Find the ideal blanking duty cycle */ - idealDutyCycle = c.c - ((c.m * hPeriod) / 1000); - } - else if (type == GTF_lockHF) { - /* Find the ideal blanking duty cycle */ - idealDutyCycle = c.c - (c.m / hFreq); - } - else if (type == GTF_lockPF) { - /* Find ideal horizontal period from blanking duty cycle formula */ - idealHPeriod = (((c.c - 100) + (sqrt((pow(100-c.c,2)) + - (0.4 * c.m * (hTotalActivePixels + rightMarginPixels + - leftMarginPixels) / dotClock)))) / (2 * c.m)) * 1000; - - /* Find the ideal blanking duty cycle */ - idealDutyCycle = c.c - ((c.m * idealHPeriod) / 1000); - } - - /* Find the number of pixels in blanking time */ - hBlankPixels = round((hTotalActivePixels * idealDutyCycle) / - ((100 - idealDutyCycle) * c.cellGran)) * c.cellGran; - - /* Find the total number of pixels */ - hTotalPixels = hTotalActivePixels + hBlankPixels; - - /* Find the horizontal back porch */ - hBackPorch = round((hBlankPixels / 2) / c.cellGran) * c.cellGran; - - /* Find the horizontal sync width */ - hSyncWidth = round(((c.hSync/100) * hTotalPixels) / c.cellGran) * c.cellGran; - - /* Find the horizontal sync + back porch */ - hSyncBP = hBackPorch + hSyncWidth; - - if (type == GTF_lockPF) { - /* Find the horizontal frequency */ - hFreq = (dotClock / hTotalPixels) * 1000; - - /* Find the number of lines in vSync + back porch */ - vSyncBP = round((c.minVSyncBP * hFreq) / 1000); - - /* Find the number of lines in the V back porch alone */ - vBackPorch = vSyncBP - c.vSyncRqd; - - /* Find the total number of lines in the vertical period */ - vTotalLines = vLines + topMarginLines + botMarginLines + vSyncBP - + interlace + c.minPorch; - - /* Find the actual vertical field frequency */ - vFieldRate = (hFreq / vTotalLines) * 1000; - } - else { - if (type == GTF_lockVF) { - /* Find the horizontal frequency */ - hFreq = 1000 / hPeriod; - } - else if (type == GTF_lockHF) { - /* Find the horizontal frequency */ - hPeriod = 1000 / hFreq; - } - - /* Find the pixel clock frequency */ - dotClock = hTotalPixels / hPeriod; - } - - /* Return the computed frequencies */ - t->vFreq = vFieldRate; - t->hFreq = hFreq; - t->dotClock = dotClock; - - /* Determine the vertical timing parameters */ - t->h.hTotal = (int)hTotalPixels; - t->h.hDisp = (int)hTotalActivePixels; - t->h.hSyncStart = t->h.hTotal - (int)hSyncBP; - t->h.hSyncEnd = t->h.hTotal - (int)hBackPorch; - t->h.hFrontPorch = t->h.hSyncStart - t->h.hDisp; - t->h.hSyncWidth = (int)hSyncWidth; - t->h.hBackPorch = (int)hBackPorch; - - /* Determine the vertical timing parameters */ - t->v.vTotal = (int)vTotalLines; - t->v.vDisp = (int)vLines; - t->v.vSyncStart = t->v.vTotal - (int)vSyncBP; - t->v.vSyncEnd = t->v.vTotal - (int)vBackPorch; - t->v.vFrontPorch = t->v.vSyncStart - t->v.vDisp; - t->v.vSyncWidth = (int)c.vSyncRqd; - t->v.vBackPorch = (int)vBackPorch; - if (wantInterlace) { - /* Halve the timings for interlaced modes */ - t->v.vTotal /= 2; - t->v.vDisp /= 2; - t->v.vSyncStart /= 2; - t->v.vSyncEnd /= 2; - t->v.vFrontPorch /= 2; - t->v.vSyncWidth /= 2; - t->v.vBackPorch /= 2; - t->dotClock /= 2; - } - - /* Mark as GTF timing using the sync polarities */ - t->interlace = (wantInterlace) ? 'I' : 'N'; - t->hSyncPol = '-'; - t->vSyncPol = '+'; -} - -void GTF_getConstants(GTF_constants *constants) -{ *constants = GC; } - -void GTF_setConstants(GTF_constants *constants) -{ GC = *constants; } - -#ifdef TESTING_GTF - -void main(int argc,char *argv[]) -{ - FILE *f; - double xPixels,yPixels,freq; - ibool interlace; - GTF_timings t; - - if (argc != 5 && argc != 6) { - printf("Usage: GTFCALC <xPixels> <yPixels> <freq> [[Hz] [KHz] [MHz]] [I]\n"); - printf("\n"); - printf("where <xPixels> is the horizontal resolution of the mode, <yPixels> is the\n"); - printf("vertical resolution of the mode. The <freq> value will be the frequency to\n"); - printf("drive the calculations, and will be either the vertical frequency (in Hz)\n"); - printf("the horizontal frequency (in KHz) or the dot clock (in MHz). To generate\n"); - printf("timings for an interlaced mode, add 'I' to the end of the command line.\n"); - printf("\n"); - printf("For example to generate timings for 640x480 at 60Hz vertical:\n"); - printf("\n"); - printf(" GTFCALC 640 480 60 Hz\n"); - printf("\n"); - printf("For example to generate timings for 640x480 at 31.5KHz horizontal:\n"); - printf("\n"); - printf(" GTFCALC 640 480 31.5 KHz\n"); - printf("\n"); - printf("For example to generate timings for 640x480 with a 25.175Mhz dot clock:\n"); - printf("\n"); - printf(" GTFCALC 640 480 25.175 MHz\n"); - printf("\n"); - printf("GTFCALC will print a summary of the results found, and dump the CRTC\n"); - printf("values to the UVCONFIG.CRT file in the format used by SciTech Display Doctor.\n"); - exit(1); - } - - /* Get values from command line */ - xPixels = atof(argv[1]); - yPixels = atof(argv[2]); - freq = atof(argv[3]); - interlace = ((argc == 6) && (argv[5][0] == 'I')); - - /* Compute the CRTC timings */ - if (toupper(argv[4][0]) == 'H') - GTF_calcTimings(xPixels,yPixels,freq,GTF_lockVF,false,interlace,&t); - else if (toupper(argv[4][0]) == 'K') - GTF_calcTimings(xPixels,yPixels,freq,GTF_lockHF,false,interlace,&t); - else if (toupper(argv[4][0]) == 'M') - GTF_calcTimings(xPixels,yPixels,freq,GTF_lockPF,false,interlace,&t); - else { - printf("Unknown command line!\n"); - exit(1); - } - - /* Dump summary info to standard output */ - printf("CRTC values for %.0fx%.0f @ %.2f %s\n", xPixels, yPixels, freq, argv[4]); - printf("\n"); - printf(" hTotal = %-4d vTotal = %-4d\n", - t.h.hTotal, t.v.vTotal); - printf(" hDisp = %-4d vDisp = %-4d\n", - t.h.hDisp, t.v.vDisp); - printf(" hSyncStart = %-4d vSyncStart = %-4d\n", - t.h.hSyncStart, t.v.vSyncStart); - printf(" hSyncEnd = %-4d vSyncEnd = %-4d\n", - t.h.hSyncEnd, t.v.vSyncEnd); - printf(" hFrontPorch = %-4d vFrontPorch = %-4d\n", - t.h.hFrontPorch, t.v.vFrontPorch); - printf(" hSyncWidth = %-4d vSyncWidth = %-4d\n", - t.h.hSyncWidth, t.v.vSyncWidth); - printf(" hBackPorch = %-4d vBackPorch = %-4d\n", - t.h.hBackPorch, t.v.vBackPorch); - printf("\n"); - printf(" Interlaced = %s\n", (t.interlace == 'I') ? "Yes" : "No"); - printf(" H sync pol = %c\n", t.hSyncPol); - printf(" V sync pol = %c\n", t.vSyncPol); - printf("\n"); - printf(" Vert freq = %.2f Hz\n", t.vFreq); - printf(" Horiz freq = %.2f KHz\n", t.hFreq); - printf(" Dot Clock = %.2f Mhz\n", t.dotClock); - - /* Dump to file in format used by SciTech Display Doctor */ - if ((f = fopen("UVCONFIG.CRT","w")) != NULL) { - fprintf(f, "[%.0f %.0f]\n", xPixels, yPixels); - fprintf(f, "%d %d %d %d '%c' %s\n", - t.h.hTotal, t.h.hDisp, - t.h.hSyncStart, t.h.hSyncEnd, - t.hSyncPol, (t.interlace == 'I') ? "I" : "NI"); - fprintf(f, "%d %d %d %d '%c'\n", - t.v.vTotal, t.v.vDisp, - t.v.vSyncStart, t.v.vSyncEnd, - t.vSyncPol); - fprintf(f, "%.2f\n", t.dotClock); - fclose(f); - } -} - -#endif /* TESTING */ |