svn merge ^/branches/released .

1 files changed, 741 insertions, 741 deletions

diff --git a/xorg-server/hw/xfree86/utils/gtf/gtf.c b/xorg-server/hw/xfree86/utils/gtf/gtf.c
index 8ce93276a..840626c66 100644
--- a/xorg-server/hw/xfree86/utils/gtf/gtf.c
+++ b/xorg-server/hw/xfree86/utils/gtf/gtf.c
@@ -1,741 +1,741 @@
-/* gtf.c  Generate mode timings using the GTF Timing Standard
- *
- * gcc gtf.c -o gtf -lm -Wall
- *
- * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
- * All rights reserved.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 
- * o Redistributions of source code must retain the above copyright
- *   notice, this list of conditions and the following disclaimer.
- * o 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.
- * o Neither the name of NVIDIA 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 COPYRIGHT HOLDERS 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.
- *
- * 
- *
- * This program is based on the Generalized Timing Formula(GTF TM)
- * Standard Version: 1.0, Revision: 1.0
- *
- * The GTF Document contains the following Copyright information:
- *
- * Copyright (c) 1994, 1995, 1996 - Video Electronics Standards
- * Association. Duplication of this document within VESA member
- * companies for review purposes is permitted. All other rights
- * reserved.
- *
- * While every precaution has been taken in the preparation
- * of this standard, the Video Electronics Standards Association and
- * its contributors assume no responsibility for errors or omissions,
- * and make no warranties, expressed or implied, of functionality
- * of suitability for any purpose. The sample code contained within
- * this standard may be used without restriction.
- *
- * 
- *
- * The GTF EXCEL(TM) SPREADSHEET, a sample (and the definitive)
- * implementation of the GTF Timing Standard, is available at:
- *
- * ftp://ftp.vesa.org/pub/GTF/GTF_V1R1.xls
- *
- *
- *
- * This program takes a desired resolution and vertical refresh rate,
- * and computes mode timings according to the GTF Timing Standard.
- * These mode timings can then be formatted as an XServer modeline
- * or a mode description for use by fbset(8).
- *
- *
- *
- * NOTES:
- *
- * The GTF allows for computation of "margins" (the visible border
- * surrounding the addressable video); on most non-overscan type
- * systems, the margin period is zero.  I've implemented the margin
- * computations but not enabled it because 1) I don't really have
- * any experience with this, and 2) neither XServer modelines nor
- * fbset fb.modes provide an obvious way for margin timings to be
- * included in their mode descriptions (needs more investigation).
- * 
- * The GTF provides for computation of interlaced mode timings;
- * I've implemented the computations but not enabled them, yet.
- * I should probably enable and test this at some point.
- *
- * 
- *
- * TODO:
- *
- * o Add support for interlaced modes.
- *
- * o Implement the other portions of the GTF: compute mode timings
- *   given either the desired pixel clock or the desired horizontal
- *   frequency.
- *
- * o It would be nice if this were more general purpose to do things
- *   outside the scope of the GTF: like generate double scan mode
- *   timings, for example.
- *   
- * o Printing digits to the right of the decimal point when the
- *   digits are 0 annoys me.
- *
- * o Error checking.
- *
- */
-
-#ifdef HAVE_XORG_CONFIG_H
-# include <xorg-config.h>
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-
-#define MARGIN_PERCENT    1.8   /* % of active vertical image                */
-#define CELL_GRAN         8.0   /* assumed character cell granularity        */
-#define MIN_PORCH         1     /* minimum front porch                       */
-#define V_SYNC_RQD        3     /* width of vsync in lines                   */
-#define H_SYNC_PERCENT    8.0   /* width of hsync as % of total line         */
-#define MIN_VSYNC_PLUS_BP 550.0 /* min time of vsync + back porch (microsec) */
-#define M                 600.0 /* blanking formula gradient                 */
-#define C                 40.0  /* blanking formula offset                   */
-#define K                 128.0 /* blanking formula scaling factor           */
-#define J                 20.0  /* blanking formula scaling factor           */
-
-/* C' and M' are part of the Blanking Duty Cycle computation */
-
-#define C_PRIME           (((C - J) * K/256.0) + J)
-#define M_PRIME           (K/256.0 * M)
-
-
-/* struct definitions */
-
-typedef struct __mode
-{
-    int hr, hss, hse, hfl;
-    int vr, vss, vse, vfl;
-    float pclk, h_freq, v_freq;
-} mode;
-
-
-typedef struct __options
-{
-    int x, y;
-    int xorgmode, fbmode;
-    float v_freq;
-} options;
-
-
-
-
-/* prototypes */
-
-void print_value(int n, char *name, float val);
-void print_xf86_mode (mode *m);
-void print_fb_mode (mode *m);
-mode *vert_refresh (int h_pixels, int v_lines, float freq,
-                    int interlaced, int margins);
-options *parse_command_line (int argc, char *argv[]);
-
-
-
-
-/*
- * print_value() - print the result of the named computation; this is
- * useful when comparing against the GTF EXCEL spreadsheet.
- */
-
-int global_verbose = 0;
-
-void print_value(int n, char *name, float val)
-{
-    if (global_verbose) {
-        printf("%2d: %-27s: %15f\n", n, name, val);
-    }
-}
-
-
-
-/* print_xf86_mode() - print the XServer modeline, given mode timings. */
-
-void print_xf86_mode (mode *m)
-{
-    printf ("\n");
-    printf ("  # %dx%d @ %.2f Hz (GTF) hsync: %.2f kHz; pclk: %.2f MHz\n",
-            m->hr, m->vr, m->v_freq, m->h_freq, m->pclk);
-    
-    printf ("  Modeline \"%dx%d_%.2f\"  %.2f"
-            "  %d %d %d %d"
-            "  %d %d %d %d"
-            "  -HSync +Vsync\n\n",
-            m->hr, m->vr, m->v_freq, m->pclk,
-            m->hr, m->hss, m->hse, m->hfl,
-            m->vr, m->vss, m->vse, m->vfl);
-    
-}
-
-
-
-/*
- * print_fb_mode() - print a mode description in fbset(8) format;
- * see the fb.modes(8) manpage.  The timing description used in
- * this is rather odd; they use "left and right margin" to refer
- * to the portion of the hblank before and after the sync pulse
- * by conceptually wrapping the portion of the blank after the pulse
- * to infront of the visible region; ie:
- * 
- *
- * Timing description I'm accustomed to:
- *
- *
- *
- *     <--------1--------> <--2--> <--3--> <--4-->
- *                                _________
- *    |-------------------|_______|       |_______
- *
- *                        R       SS      SE     FL
- *       
- * 1: visible image
- * 2: blank before sync (aka front porch)
- * 3: sync pulse
- * 4: blank after sync (aka back porch)
- * R: Resolution
- * SS: Sync Start
- * SE: Sync End
- * FL: Frame Length
- *
- *
- * But the fb.modes format is:
- *
- *
- *    <--4--> <--------1--------> <--2--> <--3--> 
- *                                       _________
- *    _______|-------------------|_______|       |
- *  
- * The fb.modes(8) manpage refers to <4> and <2> as the left and
- * right "margin" (as well as upper and lower margin in the vertical
- * direction) -- note that this has nothing to do with the term
- * "margin" used in the GTF Timing Standard.
- *
- * XXX always prints the 32 bit mode -- should I provide a command
- * line option to specify the bpp?  It's simple enough for a user
- * to edit the mode description after it's generated.
- */
-
-void print_fb_mode (mode *m)
-{
-    printf ("\n");
-    printf ("mode \"%dx%d %.2fHz 32bit (GTF)\"\n",
-            m->hr, m->vr, m->v_freq);
-    printf ("    # PCLK: %.2f MHz, H: %.2f kHz, V: %.2f Hz\n",
-            m->pclk, m->h_freq, m->v_freq);
-    printf ("    geometry %d %d %d %d 32\n",
-            m->hr, m->vr, m->hr, m->vr);
-    printf ("    timings %d %d %d %d %d %d %d\n",
-            (int) rint(1000000.0/m->pclk),/* pixclock in picoseconds */
-            m->hfl - m->hse,              /* left margin (in pixels) */
-            m->hss - m->hr,               /* right margin (in pixels) */
-            m->vfl - m->vse,              /* upper margin (in pixel lines) */
-            m->vss - m->vr,               /* lower margin (in pixel lines) */
-            m->hse - m->hss,              /* horizontal sync length (pixels) */
-            m->vse - m->vss);             /* vert sync length (pixel lines) */
-    printf ("    hsync low\n");
-    printf ("    vsync high\n");
-    printf ("endmode\n\n");
-    
-}
-
-
-
-
-/*
- * vert_refresh() - as defined by the GTF Timing Standard, compute the
- * Stage 1 Parameters using the vertical refresh frequency.  In other
- * words: input a desired resolution and desired refresh rate, and
- * output the GTF mode timings.
- *
- * XXX All the code is in place to compute interlaced modes, but I don't
- * feel like testing it right now.
- *
- * XXX margin computations are implemented but not tested (nor used by
- * XServer of fbset mode descriptions, from what I can tell).
- */
-
-mode *vert_refresh (int h_pixels, int v_lines, float freq,
-                    int interlaced, int margins)
-{
-    float h_pixels_rnd;
-    float v_lines_rnd;
-    float v_field_rate_rqd;
-    float top_margin;
-    float bottom_margin;
-    float interlace;
-    float h_period_est;
-    float vsync_plus_bp;
-    float v_back_porch;
-    float total_v_lines;
-    float v_field_rate_est;
-    float h_period;
-    float v_field_rate;
-    float v_frame_rate;
-    float left_margin;
-    float right_margin;
-    float total_active_pixels;
-    float ideal_duty_cycle;
-    float h_blank;
-    float total_pixels;
-    float pixel_freq;
-    float h_freq;
-
-    float h_sync;
-    float h_front_porch;
-    float v_odd_front_porch_lines;
-
-    mode *m = (mode*) malloc (sizeof (mode));
-    
-    
-    /*  1. In order to give correct results, the number of horizontal
-     *  pixels requested is first processed to ensure that it is divisible
-     *  by the character size, by rounding it to the nearest character
-     *  cell boundary:
-     *
-     *  [H PIXELS RND] = ((ROUND([H PIXELS]/[CELL GRAN RND],0))*[CELLGRAN RND])
-     */
-    
-    h_pixels_rnd = rint((float) h_pixels / CELL_GRAN) * CELL_GRAN;
-    
-    print_value(1, "[H PIXELS RND]", h_pixels_rnd);
-
-    
-    /*  2. If interlace is requested, the number of vertical lines assumed
-     *  by the calculation must be halved, as the computation calculates
-     *  the number of vertical lines per field. In either case, the
-     *  number of lines is rounded to the nearest integer.
-     *   
-     *  [V LINES RND] = IF([INT RQD?]="y", ROUND([V LINES]/2,0),
-     *                                     ROUND([V LINES],0))
-     */
-
-    v_lines_rnd = interlaced ?
-            rint((float) v_lines) / 2.0 :
-            rint((float) v_lines);
-    
-    print_value(2, "[V LINES RND]", v_lines_rnd);
-    
-    
-    /*  3. Find the frame rate required:
-     *
-     *  [V FIELD RATE RQD] = IF([INT RQD?]="y", [I/P FREQ RQD]*2,
-     *                                          [I/P FREQ RQD])
-     */
-
-    v_field_rate_rqd = interlaced ? (freq * 2.0) : (freq);
-
-    print_value(3, "[V FIELD RATE RQD]", v_field_rate_rqd);
-    
-
-    /*  4. Find number of lines in Top margin:
-     *
-     *  [TOP MARGIN (LINES)] = IF([MARGINS RQD?]="Y",
-     *          ROUND(([MARGIN%]/100*[V LINES RND]),0),
-     *          0)
-     */
-
-    top_margin = margins ? rint(MARGIN_PERCENT / 100.0 * v_lines_rnd) : (0.0);
-
-    print_value(4, "[TOP MARGIN (LINES)]", top_margin);
-    
-
-    /*  5. Find number of lines in Bottom margin:
-     *
-     *  [BOT MARGIN (LINES)] = IF([MARGINS RQD?]="Y",
-     *          ROUND(([MARGIN%]/100*[V LINES RND]),0),
-     *          0)
-     */
-
-    bottom_margin = margins ? rint(MARGIN_PERCENT/100.0 * v_lines_rnd) : (0.0);
-
-    print_value(5, "[BOT MARGIN (LINES)]", bottom_margin);
-
-    
-    /*  6. If interlace is required, then set variable [INTERLACE]=0.5:
-     *   
-     *  [INTERLACE]=(IF([INT RQD?]="y",0.5,0))
-     */
-
-    interlace = interlaced ? 0.5 : 0.0;
-
-    print_value(6, "[INTERLACE]", interlace);
-    
-
-    /*  7. Estimate the Horizontal period
-     *
-     *  [H PERIOD EST] = ((1/[V FIELD RATE RQD]) - [MIN VSYNC+BP]/1000000) /
-     *                    ([V LINES RND] + (2*[TOP MARGIN (LINES)]) +
-     *                     [MIN PORCH RND]+[INTERLACE]) * 1000000
-     */
-
-    h_period_est = (((1.0/v_field_rate_rqd) - (MIN_VSYNC_PLUS_BP/1000000.0))
-                    / (v_lines_rnd + (2*top_margin) + MIN_PORCH + interlace)
-                    * 1000000.0);
-
-    print_value(7, "[H PERIOD EST]", h_period_est);
-    
-
-    /*  8. Find the number of lines in V sync + back porch:
-     *
-     *  [V SYNC+BP] = ROUND(([MIN VSYNC+BP]/[H PERIOD EST]),0)
-     */
-
-    vsync_plus_bp = rint(MIN_VSYNC_PLUS_BP/h_period_est);
-
-    print_value(8, "[V SYNC+BP]", vsync_plus_bp);
-    
-    
-    /*  9. Find the number of lines in V back porch alone:
-     *
-     *  [V BACK PORCH] = [V SYNC+BP] - [V SYNC RND]
-     *
-     *  XXX is "[V SYNC RND]" a typo? should be [V SYNC RQD]?
-     */
-    
-    v_back_porch = vsync_plus_bp - V_SYNC_RQD;
-    
-    print_value(9, "[V BACK PORCH]", v_back_porch);
-    
-
-    /*  10. Find the total number of lines in Vertical field period:
-     *
-     *  [TOTAL V LINES] = [V LINES RND] + [TOP MARGIN (LINES)] +
-     *                    [BOT MARGIN (LINES)] + [V SYNC+BP] + [INTERLACE] +
-     *                    [MIN PORCH RND]
-     */
-
-    total_v_lines = v_lines_rnd + top_margin + bottom_margin + vsync_plus_bp +
-        interlace + MIN_PORCH;
-    
-    print_value(10, "[TOTAL V LINES]", total_v_lines);
-    
-
-    /*  11. Estimate the Vertical field frequency:
-     *
-     *  [V FIELD RATE EST] = 1 / [H PERIOD EST] / [TOTAL V LINES] * 1000000
-     */
-
-    v_field_rate_est = 1.0 / h_period_est / total_v_lines * 1000000.0;
-    
-    print_value(11, "[V FIELD RATE EST]", v_field_rate_est);
-    
-
-    /*  12. Find the actual horizontal period:
-     *
-     *  [H PERIOD] = [H PERIOD EST] / ([V FIELD RATE RQD] / [V FIELD RATE EST])
-     */
-
-    h_period = h_period_est / (v_field_rate_rqd / v_field_rate_est);
-    
-    print_value(12, "[H PERIOD]", h_period);
-    
-
-    /*  13. Find the actual Vertical field frequency:
-     *
-     *  [V FIELD RATE] = 1 / [H PERIOD] / [TOTAL V LINES] * 1000000
-     */
-
-    v_field_rate = 1.0 / h_period / total_v_lines * 1000000.0;
-
-    print_value(13, "[V FIELD RATE]", v_field_rate);
-    
-
-    /*  14. Find the Vertical frame frequency:
-     *
-     *  [V FRAME RATE] = (IF([INT RQD?]="y", [V FIELD RATE]/2, [V FIELD RATE]))
-     */
-
-    v_frame_rate = interlaced ? v_field_rate / 2.0 : v_field_rate;
-
-    print_value(14, "[V FRAME RATE]", v_frame_rate);
-    
-
-    /*  15. Find number of pixels in left margin:
-     *
-     *  [LEFT MARGIN (PIXELS)] = (IF( [MARGINS RQD?]="Y",
-     *          (ROUND( ([H PIXELS RND] * [MARGIN%] / 100 /
-     *                   [CELL GRAN RND]),0)) * [CELL GRAN RND],
-     *          0))
-     */
-
-    left_margin = margins ?
-        rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN :
-        0.0;
-    
-    print_value(15, "[LEFT MARGIN (PIXELS)]", left_margin);
-    
-
-    /*  16. Find number of pixels in right margin:
-     *
-     *  [RIGHT MARGIN (PIXELS)] = (IF( [MARGINS RQD?]="Y",
-     *          (ROUND( ([H PIXELS RND] * [MARGIN%] / 100 /
-     *                   [CELL GRAN RND]),0)) * [CELL GRAN RND],
-     *          0))
-     */
-    
-    right_margin = margins ?
-        rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN :
-        0.0;
-    
-    print_value(16, "[RIGHT MARGIN (PIXELS)]", right_margin);
-    
-
-    /*  17. Find total number of active pixels in image and left and right
-     *  margins:
-     *
-     *  [TOTAL ACTIVE PIXELS] = [H PIXELS RND] + [LEFT MARGIN (PIXELS)] +
-     *                          [RIGHT MARGIN (PIXELS)]
-     */
-
-    total_active_pixels = h_pixels_rnd + left_margin + right_margin;
-    
-    print_value(17, "[TOTAL ACTIVE PIXELS]", total_active_pixels);
-    
-    
-    /*  18. Find the ideal blanking duty cycle from the blanking duty cycle
-     *  equation:
-     *
-     *  [IDEAL DUTY CYCLE] = [C'] - ([M']*[H PERIOD]/1000)
-     */
-
-    ideal_duty_cycle = C_PRIME - (M_PRIME * h_period / 1000.0);
-    
-    print_value(18, "[IDEAL DUTY CYCLE]", ideal_duty_cycle);
-    
-
-    /*  19. Find the number of pixels in the blanking time to the nearest
-     *  double character cell:
-     *
-     *  [H BLANK (PIXELS)] = (ROUND(([TOTAL ACTIVE PIXELS] *
-     *                               [IDEAL DUTY CYCLE] /
-     *                               (100-[IDEAL DUTY CYCLE]) /
-     *                               (2*[CELL GRAN RND])), 0))
-     *                       * (2*[CELL GRAN RND])
-     */
-
-    h_blank = rint(total_active_pixels *
-                   ideal_duty_cycle /
-                   (100.0 - ideal_duty_cycle) /
-                   (2.0 * CELL_GRAN)) * (2.0 * CELL_GRAN);
-    
-    print_value(19, "[H BLANK (PIXELS)]", h_blank);
-    
-
-    /*  20. Find total number of pixels:
-     *
-     *  [TOTAL PIXELS] = [TOTAL ACTIVE PIXELS] + [H BLANK (PIXELS)]
-     */
-
-    total_pixels = total_active_pixels + h_blank;
-    
-    print_value(20, "[TOTAL PIXELS]", total_pixels);
-    
-
-    /*  21. Find pixel clock frequency:
-     *
-     *  [PIXEL FREQ] = [TOTAL PIXELS] / [H PERIOD]
-     */
-    
-    pixel_freq = total_pixels / h_period;
-    
-    print_value(21, "[PIXEL FREQ]", pixel_freq);
-    
-
-    /*  22. Find horizontal frequency:
-     *
-     *  [H FREQ] = 1000 / [H PERIOD]
-     */
-
-    h_freq = 1000.0 / h_period;
-    
-    print_value(22, "[H FREQ]", h_freq);
-    
-
-
-    /* Stage 1 computations are now complete; I should really pass
-       the results to another function and do the Stage 2
-       computations, but I only need a few more values so I'll just
-       append the computations here for now */
-
-    
-
-    /*  17. Find the number of pixels in the horizontal sync period:
-     *
-     *  [H SYNC (PIXELS)] =(ROUND(([H SYNC%] / 100 * [TOTAL PIXELS] /
-     *                             [CELL GRAN RND]),0))*[CELL GRAN RND]
-     */
-
-    h_sync = rint(H_SYNC_PERCENT/100.0 * total_pixels / CELL_GRAN) * CELL_GRAN;
-
-    print_value(17, "[H SYNC (PIXELS)]", h_sync);
-    
-
-    /*  18. Find the number of pixels in the horizontal front porch period:
-     *
-     *  [H FRONT PORCH (PIXELS)] = ([H BLANK (PIXELS)]/2)-[H SYNC (PIXELS)]
-     */
-
-    h_front_porch = (h_blank / 2.0) - h_sync;
-
-    print_value(18, "[H FRONT PORCH (PIXELS)]", h_front_porch);
-    
-    
-    /*  36. Find the number of lines in the odd front porch period:
-     *
-     *  [V ODD FRONT PORCH(LINES)]=([MIN PORCH RND]+[INTERLACE])
-     */
-    
-    v_odd_front_porch_lines = MIN_PORCH + interlace;
-    
-    print_value(36, "[V ODD FRONT PORCH(LINES)]", v_odd_front_porch_lines);
-    
-
-    /* finally, pack the results in the mode struct */
-    
-    m->hr  = (int) (h_pixels_rnd);
-    m->hss = (int) (h_pixels_rnd + h_front_porch);
-    m->hse = (int) (h_pixels_rnd + h_front_porch + h_sync);
-    m->hfl = (int) (total_pixels);
-
-    m->vr  = (int) (v_lines_rnd);
-    m->vss = (int) (v_lines_rnd + v_odd_front_porch_lines);
-    m->vse = (int) (int) (v_lines_rnd + v_odd_front_porch_lines + V_SYNC_RQD);
-    m->vfl = (int) (total_v_lines);
-
-    m->pclk   = pixel_freq;
-    m->h_freq = h_freq;
-    m->v_freq = freq;
-
-    return (m);
-    
-}
-
-
-
-
-/*
- * parse_command_line() - parse the command line and return an
- * alloced structure containing the results.  On error print usage
- * and return NULL.
- */ 
-
-options *parse_command_line (int argc, char *argv[])
-{
-    int n;
-
-    options *o = (options *) calloc (1, sizeof (options));
-
-    if (argc < 4) goto bad_option;
-
-    o->x = atoi (argv[1]);
-    o->y = atoi (argv[2]);
-    o->v_freq = atof (argv[3]);
-
-    /* XXX should check for errors in the above */
-    
-    n = 4;
-
-    while (n < argc) {
-        if ((strcmp (argv[n], "-v") == 0) ||
-            (strcmp (argv[n], "--verbose") == 0)) {
-            global_verbose = 1;
-        } else if ((strcmp (argv[n], "-f") == 0) ||
-                   (strcmp (argv[n], "--fbmode") == 0)) {
-            o->fbmode = 1;
-        } else if ((strcmp (argv[n], "-x") == 0) ||
-		   (strcmp (argv[n], "--xorgmode") == 0) ||
-                   (strcmp (argv[n], "--xf86mode") == 0)) {
-            o->xorgmode = 1;
-        } else {
-            goto bad_option;
-        }
-        
-        n++;
-    }
-
-    /* if neither xorgmode nor fbmode were requested, default to
-       xorgmode */
-
-    if (!o->fbmode && !o->xorgmode) o->xorgmode = 1;
-    
-    return (o);
-    
- bad_option:
-
-    fprintf (stderr, "\n");
-    fprintf (stderr, "usage: %s x y refresh [-v|--verbose] "
-             "[-f|--fbmode] [-x|--xorgmode]\n", argv[0]);
-
-    fprintf (stderr, "\n");
-    
-    fprintf (stderr, "            x : the desired horizontal "
-             "resolution (required)\n");
-    fprintf (stderr, "            y : the desired vertical "
-             "resolution (required)\n");
-    fprintf (stderr, "      refresh : the desired refresh "
-             "rate (required)\n");
-    fprintf (stderr, " -v|--verbose : enable verbose printouts "
-             "(traces each step of the computation)\n");
-    fprintf (stderr, "  -f|--fbmode : output an fbset(8)-style mode "
-             "description\n");
-    fprintf (stderr, " -x|--xorgmode : output an "__XSERVERNAME__"-style mode "
-             "description (this is the default\n"
-             "                if no mode description is requested)\n");
-    
-    fprintf (stderr, "\n");
-    
-    free (o);
-    return (NULL);
-
-}
-
-
-
-int main (int argc, char *argv[])
-{
-    mode *m;
-    options *o;
-
-    o = parse_command_line (argc, argv);
-    if (!o) exit (1);
-    
-    m = vert_refresh (o->x, o->y, o->v_freq, 0, 0);
-    if (!m) exit (1);
-
-    if (o->xorgmode)
-        print_xf86_mode(m);
-    
-    if (o->fbmode)
-        print_fb_mode(m);
-    
-    return 0;
-    
-}
+/* gtf.c  Generate mode timings using the GTF Timing Standard

+ *

+ * gcc gtf.c -o gtf -lm -Wall

+ *

+ * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com

+ * All rights reserved.

+ * 

+ * Redistribution and use in source and binary forms, with or without

+ * modification, are permitted provided that the following conditions

+ * are met:

+ * 

+ * o Redistributions of source code must retain the above copyright

+ *   notice, this list of conditions and the following disclaimer.

+ * o 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.

+ * o Neither the name of NVIDIA 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 COPYRIGHT HOLDERS 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.

+ *

+ * 

+ *

+ * This program is based on the Generalized Timing Formula(GTF TM)

+ * Standard Version: 1.0, Revision: 1.0

+ *

+ * The GTF Document contains the following Copyright information:

+ *

+ * Copyright (c) 1994, 1995, 1996 - Video Electronics Standards

+ * Association. Duplication of this document within VESA member

+ * companies for review purposes is permitted. All other rights

+ * reserved.

+ *

+ * While every precaution has been taken in the preparation

+ * of this standard, the Video Electronics Standards Association and

+ * its contributors assume no responsibility for errors or omissions,

+ * and make no warranties, expressed or implied, of functionality

+ * of suitability for any purpose. The sample code contained within

+ * this standard may be used without restriction.

+ *

+ * 

+ *

+ * The GTF EXCEL(TM) SPREADSHEET, a sample (and the definitive)

+ * implementation of the GTF Timing Standard, is available at:

+ *

+ * ftp://ftp.vesa.org/pub/GTF/GTF_V1R1.xls

+ *

+ *

+ *

+ * This program takes a desired resolution and vertical refresh rate,

+ * and computes mode timings according to the GTF Timing Standard.

+ * These mode timings can then be formatted as an XServer modeline

+ * or a mode description for use by fbset(8).

+ *

+ *

+ *

+ * NOTES:

+ *

+ * The GTF allows for computation of "margins" (the visible border

+ * surrounding the addressable video); on most non-overscan type

+ * systems, the margin period is zero.  I've implemented the margin

+ * computations but not enabled it because 1) I don't really have

+ * any experience with this, and 2) neither XServer modelines nor

+ * fbset fb.modes provide an obvious way for margin timings to be

+ * included in their mode descriptions (needs more investigation).

+ * 

+ * The GTF provides for computation of interlaced mode timings;

+ * I've implemented the computations but not enabled them, yet.

+ * I should probably enable and test this at some point.

+ *

+ * 

+ *

+ * TODO:

+ *

+ * o Add support for interlaced modes.

+ *

+ * o Implement the other portions of the GTF: compute mode timings

+ *   given either the desired pixel clock or the desired horizontal

+ *   frequency.

+ *

+ * o It would be nice if this were more general purpose to do things

+ *   outside the scope of the GTF: like generate double scan mode

+ *   timings, for example.

+ *   

+ * o Printing digits to the right of the decimal point when the

+ *   digits are 0 annoys me.

+ *

+ * o Error checking.

+ *

+ */

+

+#ifdef HAVE_XORG_CONFIG_H

+# include <xorg-config.h>

+#endif

+

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+#include <math.h>

+

+#define MARGIN_PERCENT    1.8   /* % of active vertical image                */

+#define CELL_GRAN         8.0   /* assumed character cell granularity        */

+#define MIN_PORCH         1     /* minimum front porch                       */

+#define V_SYNC_RQD        3     /* width of vsync in lines                   */

+#define H_SYNC_PERCENT    8.0   /* width of hsync as % of total line         */

+#define MIN_VSYNC_PLUS_BP 550.0 /* min time of vsync + back porch (microsec) */

+#define M                 600.0 /* blanking formula gradient                 */

+#define C                 40.0  /* blanking formula offset                   */

+#define K                 128.0 /* blanking formula scaling factor           */

+#define J                 20.0  /* blanking formula scaling factor           */

+

+/* C' and M' are part of the Blanking Duty Cycle computation */

+

+#define C_PRIME           (((C - J) * K/256.0) + J)

+#define M_PRIME           (K/256.0 * M)

+

+

+/* struct definitions */

+

+typedef struct __mode

+{

+    int hr, hss, hse, hfl;

+    int vr, vss, vse, vfl;

+    float pclk, h_freq, v_freq;

+} mode;

+

+

+typedef struct __options

+{

+    int x, y;

+    int xorgmode, fbmode;

+    float v_freq;

+} options;

+

+

+

+

+/* prototypes */

+

+void print_value(int n, char *name, float val);

+void print_xf86_mode (mode *m);

+void print_fb_mode (mode *m);

+mode *vert_refresh (int h_pixels, int v_lines, float freq,

+                    int interlaced, int margins);

+options *parse_command_line (int argc, char *argv[]);

+

+

+

+

+/*

+ * print_value() - print the result of the named computation; this is

+ * useful when comparing against the GTF EXCEL spreadsheet.

+ */

+

+int global_verbose = 0;

+

+void print_value(int n, char *name, float val)

+{

+    if (global_verbose) {

+        printf("%2d: %-27s: %15f\n", n, name, val);

+    }

+}

+

+

+

+/* print_xf86_mode() - print the XServer modeline, given mode timings. */

+

+void print_xf86_mode (mode *m)

+{

+    printf ("\n");

+    printf ("  # %dx%d @ %.2f Hz (GTF) hsync: %.2f kHz; pclk: %.2f MHz\n",

+            m->hr, m->vr, m->v_freq, m->h_freq, m->pclk);

+    

+    printf ("  Modeline \"%dx%d_%.2f\"  %.2f"

+            "  %d %d %d %d"

+            "  %d %d %d %d"

+            "  -HSync +Vsync\n\n",

+            m->hr, m->vr, m->v_freq, m->pclk,

+            m->hr, m->hss, m->hse, m->hfl,

+            m->vr, m->vss, m->vse, m->vfl);

+    

+}

+

+

+

+/*

+ * print_fb_mode() - print a mode description in fbset(8) format;

+ * see the fb.modes(8) manpage.  The timing description used in

+ * this is rather odd; they use "left and right margin" to refer

+ * to the portion of the hblank before and after the sync pulse

+ * by conceptually wrapping the portion of the blank after the pulse

+ * to infront of the visible region; ie:

+ * 

+ *

+ * Timing description I'm accustomed to:

+ *

+ *

+ *

+ *     <--------1--------> <--2--> <--3--> <--4-->

+ *                                _________

+ *    |-------------------|_______|       |_______

+ *

+ *                        R       SS      SE     FL

+ *       

+ * 1: visible image

+ * 2: blank before sync (aka front porch)

+ * 3: sync pulse

+ * 4: blank after sync (aka back porch)

+ * R: Resolution

+ * SS: Sync Start

+ * SE: Sync End

+ * FL: Frame Length

+ *

+ *

+ * But the fb.modes format is:

+ *

+ *

+ *    <--4--> <--------1--------> <--2--> <--3--> 

+ *                                       _________

+ *    _______|-------------------|_______|       |

+ *  

+ * The fb.modes(8) manpage refers to <4> and <2> as the left and

+ * right "margin" (as well as upper and lower margin in the vertical

+ * direction) -- note that this has nothing to do with the term

+ * "margin" used in the GTF Timing Standard.

+ *

+ * XXX always prints the 32 bit mode -- should I provide a command

+ * line option to specify the bpp?  It's simple enough for a user

+ * to edit the mode description after it's generated.

+ */

+

+void print_fb_mode (mode *m)

+{

+    printf ("\n");

+    printf ("mode \"%dx%d %.2fHz 32bit (GTF)\"\n",

+            m->hr, m->vr, m->v_freq);

+    printf ("    # PCLK: %.2f MHz, H: %.2f kHz, V: %.2f Hz\n",

+            m->pclk, m->h_freq, m->v_freq);

+    printf ("    geometry %d %d %d %d 32\n",

+            m->hr, m->vr, m->hr, m->vr);

+    printf ("    timings %d %d %d %d %d %d %d\n",

+            (int) rint(1000000.0/m->pclk),/* pixclock in picoseconds */

+            m->hfl - m->hse,              /* left margin (in pixels) */

+            m->hss - m->hr,               /* right margin (in pixels) */

+            m->vfl - m->vse,              /* upper margin (in pixel lines) */

+            m->vss - m->vr,               /* lower margin (in pixel lines) */

+            m->hse - m->hss,              /* horizontal sync length (pixels) */

+            m->vse - m->vss);             /* vert sync length (pixel lines) */

+    printf ("    hsync low\n");

+    printf ("    vsync high\n");

+    printf ("endmode\n\n");

+    

+}

+

+

+

+

+/*

+ * vert_refresh() - as defined by the GTF Timing Standard, compute the

+ * Stage 1 Parameters using the vertical refresh frequency.  In other

+ * words: input a desired resolution and desired refresh rate, and

+ * output the GTF mode timings.

+ *

+ * XXX All the code is in place to compute interlaced modes, but I don't

+ * feel like testing it right now.

+ *

+ * XXX margin computations are implemented but not tested (nor used by

+ * XServer of fbset mode descriptions, from what I can tell).

+ */

+

+mode *vert_refresh (int h_pixels, int v_lines, float freq,

+                    int interlaced, int margins)

+{

+    float h_pixels_rnd;

+    float v_lines_rnd;

+    float v_field_rate_rqd;

+    float top_margin;

+    float bottom_margin;

+    float interlace;

+    float h_period_est;

+    float vsync_plus_bp;

+    float v_back_porch;

+    float total_v_lines;

+    float v_field_rate_est;

+    float h_period;

+    float v_field_rate;

+    float v_frame_rate;

+    float left_margin;

+    float right_margin;

+    float total_active_pixels;

+    float ideal_duty_cycle;

+    float h_blank;

+    float total_pixels;

+    float pixel_freq;

+    float h_freq;

+

+    float h_sync;

+    float h_front_porch;

+    float v_odd_front_porch_lines;

+

+    mode *m = (mode*) malloc (sizeof (mode));

+    

+    

+    /*  1. In order to give correct results, the number of horizontal

+     *  pixels requested is first processed to ensure that it is divisible

+     *  by the character size, by rounding it to the nearest character

+     *  cell boundary:

+     *

+     *  [H PIXELS RND] = ((ROUND([H PIXELS]/[CELL GRAN RND],0))*[CELLGRAN RND])

+     */

+    

+    h_pixels_rnd = rint((float) h_pixels / CELL_GRAN) * CELL_GRAN;

+    

+    print_value(1, "[H PIXELS RND]", h_pixels_rnd);

+

+    

+    /*  2. If interlace is requested, the number of vertical lines assumed

+     *  by the calculation must be halved, as the computation calculates

+     *  the number of vertical lines per field. In either case, the

+     *  number of lines is rounded to the nearest integer.

+     *   

+     *  [V LINES RND] = IF([INT RQD?]="y", ROUND([V LINES]/2,0),

+     *                                     ROUND([V LINES],0))

+     */

+

+    v_lines_rnd = interlaced ?

+            rint((float) v_lines) / 2.0 :

+            rint((float) v_lines);

+    

+    print_value(2, "[V LINES RND]", v_lines_rnd);

+    

+    

+    /*  3. Find the frame rate required:

+     *

+     *  [V FIELD RATE RQD] = IF([INT RQD?]="y", [I/P FREQ RQD]*2,

+     *                                          [I/P FREQ RQD])

+     */

+

+    v_field_rate_rqd = interlaced ? (freq * 2.0) : (freq);

+

+    print_value(3, "[V FIELD RATE RQD]", v_field_rate_rqd);

+    

+

+    /*  4. Find number of lines in Top margin:

+     *

+     *  [TOP MARGIN (LINES)] = IF([MARGINS RQD?]="Y",

+     *          ROUND(([MARGIN%]/100*[V LINES RND]),0),

+     *          0)

+     */

+

+    top_margin = margins ? rint(MARGIN_PERCENT / 100.0 * v_lines_rnd) : (0.0);

+

+    print_value(4, "[TOP MARGIN (LINES)]", top_margin);

+    

+

+    /*  5. Find number of lines in Bottom margin:

+     *

+     *  [BOT MARGIN (LINES)] = IF([MARGINS RQD?]="Y",

+     *          ROUND(([MARGIN%]/100*[V LINES RND]),0),

+     *          0)

+     */

+

+    bottom_margin = margins ? rint(MARGIN_PERCENT/100.0 * v_lines_rnd) : (0.0);

+

+    print_value(5, "[BOT MARGIN (LINES)]", bottom_margin);

+

+    

+    /*  6. If interlace is required, then set variable [INTERLACE]=0.5:

+     *   

+     *  [INTERLACE]=(IF([INT RQD?]="y",0.5,0))

+     */

+

+    interlace = interlaced ? 0.5 : 0.0;

+

+    print_value(6, "[INTERLACE]", interlace);

+    

+

+    /*  7. Estimate the Horizontal period

+     *

+     *  [H PERIOD EST] = ((1/[V FIELD RATE RQD]) - [MIN VSYNC+BP]/1000000) /

+     *                    ([V LINES RND] + (2*[TOP MARGIN (LINES)]) +

+     *                     [MIN PORCH RND]+[INTERLACE]) * 1000000

+     */

+

+    h_period_est = (((1.0/v_field_rate_rqd) - (MIN_VSYNC_PLUS_BP/1000000.0))

+                    / (v_lines_rnd + (2*top_margin) + MIN_PORCH + interlace)

+                    * 1000000.0);

+

+    print_value(7, "[H PERIOD EST]", h_period_est);

+    

+

+    /*  8. Find the number of lines in V sync + back porch:

+     *

+     *  [V SYNC+BP] = ROUND(([MIN VSYNC+BP]/[H PERIOD EST]),0)

+     */

+

+    vsync_plus_bp = rint(MIN_VSYNC_PLUS_BP/h_period_est);

+

+    print_value(8, "[V SYNC+BP]", vsync_plus_bp);

+    

+    

+    /*  9. Find the number of lines in V back porch alone:

+     *

+     *  [V BACK PORCH] = [V SYNC+BP] - [V SYNC RND]

+     *

+     *  XXX is "[V SYNC RND]" a typo? should be [V SYNC RQD]?

+     */

+    

+    v_back_porch = vsync_plus_bp - V_SYNC_RQD;

+    

+    print_value(9, "[V BACK PORCH]", v_back_porch);

+    

+

+    /*  10. Find the total number of lines in Vertical field period:

+     *

+     *  [TOTAL V LINES] = [V LINES RND] + [TOP MARGIN (LINES)] +

+     *                    [BOT MARGIN (LINES)] + [V SYNC+BP] + [INTERLACE] +

+     *                    [MIN PORCH RND]

+     */

+

+    total_v_lines = v_lines_rnd + top_margin + bottom_margin + vsync_plus_bp +

+        interlace + MIN_PORCH;

+    

+    print_value(10, "[TOTAL V LINES]", total_v_lines);

+    

+

+    /*  11. Estimate the Vertical field frequency:

+     *

+     *  [V FIELD RATE EST] = 1 / [H PERIOD EST] / [TOTAL V LINES] * 1000000

+     */

+

+    v_field_rate_est = 1.0 / h_period_est / total_v_lines * 1000000.0;

+    

+    print_value(11, "[V FIELD RATE EST]", v_field_rate_est);

+    

+

+    /*  12. Find the actual horizontal period:

+     *

+     *  [H PERIOD] = [H PERIOD EST] / ([V FIELD RATE RQD] / [V FIELD RATE EST])

+     */

+

+    h_period = h_period_est / (v_field_rate_rqd / v_field_rate_est);

+    

+    print_value(12, "[H PERIOD]", h_period);

+    

+

+    /*  13. Find the actual Vertical field frequency:

+     *

+     *  [V FIELD RATE] = 1 / [H PERIOD] / [TOTAL V LINES] * 1000000

+     */

+

+    v_field_rate = 1.0 / h_period / total_v_lines * 1000000.0;

+

+    print_value(13, "[V FIELD RATE]", v_field_rate);

+    

+

+    /*  14. Find the Vertical frame frequency:

+     *

+     *  [V FRAME RATE] = (IF([INT RQD?]="y", [V FIELD RATE]/2, [V FIELD RATE]))

+     */

+

+    v_frame_rate = interlaced ? v_field_rate / 2.0 : v_field_rate;

+

+    print_value(14, "[V FRAME RATE]", v_frame_rate);

+    

+

+    /*  15. Find number of pixels in left margin:

+     *

+     *  [LEFT MARGIN (PIXELS)] = (IF( [MARGINS RQD?]="Y",

+     *          (ROUND( ([H PIXELS RND] * [MARGIN%] / 100 /

+     *                   [CELL GRAN RND]),0)) * [CELL GRAN RND],

+     *          0))

+     */

+

+    left_margin = margins ?

+        rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN :

+        0.0;

+    

+    print_value(15, "[LEFT MARGIN (PIXELS)]", left_margin);

+    

+

+    /*  16. Find number of pixels in right margin:

+     *

+     *  [RIGHT MARGIN (PIXELS)] = (IF( [MARGINS RQD?]="Y",

+     *          (ROUND( ([H PIXELS RND] * [MARGIN%] / 100 /

+     *                   [CELL GRAN RND]),0)) * [CELL GRAN RND],

+     *          0))

+     */

+    

+    right_margin = margins ?

+        rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN :

+        0.0;

+    

+    print_value(16, "[RIGHT MARGIN (PIXELS)]", right_margin);

+    

+

+    /*  17. Find total number of active pixels in image and left and right

+     *  margins:

+     *

+     *  [TOTAL ACTIVE PIXELS] = [H PIXELS RND] + [LEFT MARGIN (PIXELS)] +

+     *                          [RIGHT MARGIN (PIXELS)]

+     */

+

+    total_active_pixels = h_pixels_rnd + left_margin + right_margin;

+    

+    print_value(17, "[TOTAL ACTIVE PIXELS]", total_active_pixels);

+    

+    

+    /*  18. Find the ideal blanking duty cycle from the blanking duty cycle

+     *  equation:

+     *

+     *  [IDEAL DUTY CYCLE] = [C'] - ([M']*[H PERIOD]/1000)

+     */

+

+    ideal_duty_cycle = C_PRIME - (M_PRIME * h_period / 1000.0);

+    

+    print_value(18, "[IDEAL DUTY CYCLE]", ideal_duty_cycle);

+    

+

+    /*  19. Find the number of pixels in the blanking time to the nearest

+     *  double character cell:

+     *

+     *  [H BLANK (PIXELS)] = (ROUND(([TOTAL ACTIVE PIXELS] *

+     *                               [IDEAL DUTY CYCLE] /

+     *                               (100-[IDEAL DUTY CYCLE]) /

+     *                               (2*[CELL GRAN RND])), 0))

+     *                       * (2*[CELL GRAN RND])

+     */

+

+    h_blank = rint(total_active_pixels *

+                   ideal_duty_cycle /

+                   (100.0 - ideal_duty_cycle) /

+                   (2.0 * CELL_GRAN)) * (2.0 * CELL_GRAN);

+    

+    print_value(19, "[H BLANK (PIXELS)]", h_blank);

+    

+

+    /*  20. Find total number of pixels:

+     *

+     *  [TOTAL PIXELS] = [TOTAL ACTIVE PIXELS] + [H BLANK (PIXELS)]

+     */

+

+    total_pixels = total_active_pixels + h_blank;

+    

+    print_value(20, "[TOTAL PIXELS]", total_pixels);

+    

+

+    /*  21. Find pixel clock frequency:

+     *

+     *  [PIXEL FREQ] = [TOTAL PIXELS] / [H PERIOD]

+     */

+    

+    pixel_freq = total_pixels / h_period;

+    

+    print_value(21, "[PIXEL FREQ]", pixel_freq);

+    

+

+    /*  22. Find horizontal frequency:

+     *

+     *  [H FREQ] = 1000 / [H PERIOD]

+     */

+

+    h_freq = 1000.0 / h_period;

+    

+    print_value(22, "[H FREQ]", h_freq);

+    

+

+

+    /* Stage 1 computations are now complete; I should really pass

+       the results to another function and do the Stage 2

+       computations, but I only need a few more values so I'll just

+       append the computations here for now */

+

+    

+

+    /*  17. Find the number of pixels in the horizontal sync period:

+     *

+     *  [H SYNC (PIXELS)] =(ROUND(([H SYNC%] / 100 * [TOTAL PIXELS] /

+     *                             [CELL GRAN RND]),0))*[CELL GRAN RND]

+     */

+

+    h_sync = rint(H_SYNC_PERCENT/100.0 * total_pixels / CELL_GRAN) * CELL_GRAN;

+

+    print_value(17, "[H SYNC (PIXELS)]", h_sync);

+    

+

+    /*  18. Find the number of pixels in the horizontal front porch period:

+     *

+     *  [H FRONT PORCH (PIXELS)] = ([H BLANK (PIXELS)]/2)-[H SYNC (PIXELS)]

+     */

+

+    h_front_porch = (h_blank / 2.0) - h_sync;

+

+    print_value(18, "[H FRONT PORCH (PIXELS)]", h_front_porch);

+    

+    

+    /*  36. Find the number of lines in the odd front porch period:

+     *

+     *  [V ODD FRONT PORCH(LINES)]=([MIN PORCH RND]+[INTERLACE])

+     */

+    

+    v_odd_front_porch_lines = MIN_PORCH + interlace;

+    

+    print_value(36, "[V ODD FRONT PORCH(LINES)]", v_odd_front_porch_lines);

+    

+

+    /* finally, pack the results in the mode struct */

+    

+    m->hr  = (int) (h_pixels_rnd);

+    m->hss = (int) (h_pixels_rnd + h_front_porch);

+    m->hse = (int) (h_pixels_rnd + h_front_porch + h_sync);

+    m->hfl = (int) (total_pixels);

+

+    m->vr  = (int) (v_lines_rnd);

+    m->vss = (int) (v_lines_rnd + v_odd_front_porch_lines);

+    m->vse = (int) (int) (v_lines_rnd + v_odd_front_porch_lines + V_SYNC_RQD);

+    m->vfl = (int) (total_v_lines);

+

+    m->pclk   = pixel_freq;

+    m->h_freq = h_freq;

+    m->v_freq = freq;

+

+    return m;

+    

+}

+

+

+

+

+/*

+ * parse_command_line() - parse the command line and return an

+ * alloced structure containing the results.  On error print usage

+ * and return NULL.

+ */ 

+

+options *parse_command_line (int argc, char *argv[])

+{

+    int n;

+

+    options *o = (options *) calloc (1, sizeof (options));

+

+    if (argc < 4) goto bad_option;

+

+    o->x = atoi (argv[1]);

+    o->y = atoi (argv[2]);

+    o->v_freq = atof (argv[3]);

+

+    /* XXX should check for errors in the above */

+    

+    n = 4;

+

+    while (n < argc) {

+        if ((strcmp (argv[n], "-v") == 0) ||

+            (strcmp (argv[n], "--verbose") == 0)) {

+            global_verbose = 1;

+        } else if ((strcmp (argv[n], "-f") == 0) ||

+                   (strcmp (argv[n], "--fbmode") == 0)) {

+            o->fbmode = 1;

+        } else if ((strcmp (argv[n], "-x") == 0) ||

+		   (strcmp (argv[n], "--xorgmode") == 0) ||

+                   (strcmp (argv[n], "--xf86mode") == 0)) {

+            o->xorgmode = 1;

+        } else {

+            goto bad_option;

+        }

+        

+        n++;

+    }

+

+    /* if neither xorgmode nor fbmode were requested, default to

+       xorgmode */

+

+    if (!o->fbmode && !o->xorgmode) o->xorgmode = 1;

+    

+    return o;

+    

+ bad_option:

+

+    fprintf (stderr, "\n");

+    fprintf (stderr, "usage: %s x y refresh [-v|--verbose] "

+             "[-f|--fbmode] [-x|--xorgmode]\n", argv[0]);

+

+    fprintf (stderr, "\n");

+    

+    fprintf (stderr, "            x : the desired horizontal "

+             "resolution (required)\n");

+    fprintf (stderr, "            y : the desired vertical "

+             "resolution (required)\n");

+    fprintf (stderr, "      refresh : the desired refresh "

+             "rate (required)\n");

+    fprintf (stderr, " -v|--verbose : enable verbose printouts "

+             "(traces each step of the computation)\n");

+    fprintf (stderr, "  -f|--fbmode : output an fbset(8)-style mode "

+             "description\n");

+    fprintf (stderr, " -x|--xorgmode : output an "__XSERVERNAME__"-style mode "

+             "description (this is the default\n"

+             "                if no mode description is requested)\n");

+    

+    fprintf (stderr, "\n");

+    

+    free (o);

+    return NULL;

+

+}

+

+

+

+int main (int argc, char *argv[])

+{

+    mode *m;

+    options *o;

+

+    o = parse_command_line (argc, argv);

+    if (!o) exit (1);

+    

+    m = vert_refresh (o->x, o->y, o->v_freq, 0, 0);

+    if (!m) exit (1);

+

+    if (o->xorgmode)

+        print_xf86_mode(m);

+    

+    if (o->fbmode)

+        print_fb_mode(m);

+    

+    return 0;

+    

+}