GHOST_DisplayManagerX11.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Video mode switching
 * Copyright (C) 1997-2001 Id Software, Inc.
 * Ported from Quake 2 by Alex Fraser <alex@phatcore.com>
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifdef WITH_X11_XF86VMODE
#  include <X11/Xlib.h>
#  include <X11/extensions/xf86vmode.h>
#endif

#include "GHOST_DisplayManagerX11.h"
#include "GHOST_SystemX11.h"



GHOST_DisplayManagerX11::
GHOST_DisplayManagerX11(
    GHOST_SystemX11 *system
) :
    GHOST_DisplayManager(),
    m_system(system)
{
    //nothing to do.
}

    GHOST_TSuccess 
GHOST_DisplayManagerX11::
getNumDisplays(
    GHOST_TUns8& numDisplays
) const{    
    numDisplays =  m_system->getNumDisplays();
    return GHOST_kSuccess;
}


    GHOST_TSuccess 
GHOST_DisplayManagerX11::
getNumDisplaySettings(
    GHOST_TUns8 display,
    GHOST_TInt32& numSettings
) const{
#ifdef WITH_X11_XF86VMODE
    int majorVersion, minorVersion;
    XF86VidModeModeInfo **vidmodes;
    Display *dpy = m_system->getXDisplay();

    GHOST_ASSERT(display < 1, "Only single display systems are currently supported.\n");

    if (dpy == NULL)
        return GHOST_kFailure;

    majorVersion = minorVersion = 0;
    if (!XF86VidModeQueryVersion(dpy, &majorVersion, &minorVersion)) {
        fprintf(stderr, "Error: XF86VidMode extension missing!\n");
        return GHOST_kFailure;
    }

    /* The X11 man page says vidmodes needs to be freed, but doing so causes a
     * segfault. - z0r */
    XF86VidModeGetAllModeLines(dpy, DefaultScreen(dpy), &numSettings, &vidmodes);

#else
    // We only have one X11 setting at the moment.
    GHOST_ASSERT(display < 1, "Only single display systems are currently supported.\n");    
    numSettings = GHOST_TInt32(1);
#endif

    return GHOST_kSuccess;
}

    GHOST_TSuccess 
GHOST_DisplayManagerX11::
getDisplaySetting(
    GHOST_TUns8 display,
    GHOST_TInt32 index,
    GHOST_DisplaySetting& setting
) const {

#ifdef WITH_X11_XF86VMODE
    int majorVersion, minorVersion;
    XF86VidModeModeInfo **vidmodes;
    Display *dpy = m_system->getXDisplay();
    int numSettings;

    GHOST_ASSERT(display < 1, "Only single display systems are currently supported.\n");

    if (dpy == NULL)
        return GHOST_kFailure;

    majorVersion = minorVersion = 0;
    if (!XF86VidModeQueryVersion(dpy, &majorVersion, &minorVersion)) {
        fprintf(stderr, "Error: XF86VidMode extension missing!\n");
        return GHOST_kFailure;
    }

    /* The X11 man page says vidmodes needs to be freed, but doing so causes a
     * segfault. - z0r */
    XF86VidModeGetAllModeLines(dpy, DefaultScreen(dpy), &numSettings, &vidmodes);
    GHOST_ASSERT(index < numSettings, "Requested setting outside of valid range.\n");

    setting.xPixels = vidmodes[index]->hdisplay;
    setting.yPixels = vidmodes[index]->vdisplay;
    setting.bpp = DefaultDepth(dpy,DefaultScreen(dpy));

#else
    GHOST_ASSERT(display < 1, "Only single display systems are currently supported.\n");    
    GHOST_ASSERT(index < 1, "Requested setting outside of valid range.\n"); 
    
    Display * x_display = m_system->getXDisplay();

    if (x_display == NULL) {
        return GHOST_kFailure;
    }

    setting.xPixels  = DisplayWidth(x_display, DefaultScreen(x_display));
    setting.yPixels = DisplayHeight(x_display, DefaultScreen(x_display));
    setting.bpp = DefaultDepth(x_display,DefaultScreen(x_display));
#endif

    // Don't think it's possible to get this value from X!
    // So let's guess!!
    setting.frequency = 60;

    return GHOST_kSuccess;
}
    
    GHOST_TSuccess 
GHOST_DisplayManagerX11::
getCurrentDisplaySetting(
    GHOST_TUns8 display,
    GHOST_DisplaySetting& setting
) const {
    /* According to the xf86vidmodegetallmodelines man page,
     * "The first element of the array corresponds to the current video mode."
     */
    return getDisplaySetting(display,GHOST_TInt32(0),setting);
}


    GHOST_TSuccess 
GHOST_DisplayManagerX11::
setCurrentDisplaySetting(
    GHOST_TUns8 display,
    const GHOST_DisplaySetting& setting
){
#ifdef WITH_X11_XF86VMODE
    //
    // Mode switching code ported from Quake 2:
    // ftp://ftp.idsoftware.com/idstuff/source/q2source-3.21.zip
    // See linux/gl_glx.c:GLimp_SetMode
    //
    int majorVersion, minorVersion;
    XF86VidModeModeInfo **vidmodes;
    Display *dpy = m_system->getXDisplay();
    int scrnum, num_vidmodes;
    int best_fit, best_dist, dist, x, y;

    if (dpy == NULL)
        return GHOST_kFailure;

    scrnum = DefaultScreen(dpy);

    // Get video mode list
    majorVersion = minorVersion = 0;
    if (!XF86VidModeQueryVersion(dpy, &majorVersion, &minorVersion)) {
        fprintf(stderr, "Error: XF86VidMode extension missing!\n");
        return GHOST_kFailure;
    }
#  ifdef _DEBUG
    printf("Using XFree86-VidModeExtension Version %d.%d\n",
            majorVersion, minorVersion);
#  endif

    /* The X11 man page says vidmodes needs to be freed, but doing so causes a
     * segfault. - z0r */
    XF86VidModeGetAllModeLines(dpy, scrnum, &num_vidmodes, &vidmodes);

    best_dist = 9999999;
    best_fit = -1;

    for (int i = 0; i < num_vidmodes; i++) {
        if (setting.xPixels > vidmodes[i]->hdisplay ||
            setting.yPixels > vidmodes[i]->vdisplay)
            continue;

        x = setting.xPixels - vidmodes[i]->hdisplay;
        y = setting.yPixels - vidmodes[i]->vdisplay;
        dist = (x * x) + (y * y);
        if (dist < best_dist) {
            best_dist = dist;
            best_fit = i;
        }
    }

    if (best_fit != -1) {
#  ifdef _DEBUG
        int actualWidth, actualHeight;
        actualWidth = vidmodes[best_fit]->hdisplay;
        actualHeight = vidmodes[best_fit]->vdisplay;
        printf("Switching to video mode %dx%d\n",
                actualWidth, actualHeight);
#  endif

        // change to the mode
        XF86VidModeSwitchToMode(dpy, scrnum, vidmodes[best_fit]);

        // Move the viewport to top left
        XF86VidModeSetViewPort(dpy, scrnum, 0, 0);
    } else
        return GHOST_kFailure;

    XFlush(dpy);
    return GHOST_kSuccess;

#else
    // Just pretend the request was successful.
    return GHOST_kSuccess;
#endif
}