/*
* Descent 3 
* Copyright (C) 2024 Parallax Software
*
* 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 3 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, see <http://www.gnu.org/licenses/>.

--- HISTORICAL COMMENTS FOLLOW ---

 * $Logfile: /DescentIII/Main/renderer/lnxscreenmode.cpp $
 * $Revision: 1.6 $
 * $Date: 2000/06/29 18:48:13 $
 * $Author: icculus $
 *
 *
 *
 * $Log: lnxscreenmode.cpp,v $
 * Revision 1.6  2000/06/29 18:48:13  icculus
 * Dumb typo fixed.
 *
 * Revision 1.5  2000/06/29 06:41:24  icculus
 * mad commits.
 *
 * Revision 1.4  2000/06/24 01:15:15  icculus
 * patched to compile.
 *
 * Revision 1.3  2000/05/29 05:25:57  icculus
 * Command line fix: Changed "--nofullscreen" to "--windowed" (or "-w").
 *
 * Revision 1.2  2000/04/28 20:25:51  icculus
 * Updates, cleanups, and SDLification.
 *
 * Revision 1.1.1.1  2000/04/18 00:00:49  icculus
 * initial checkin
 *
 *
 * 4     9/09/99 4:38p Jeff
 * fixed crashes if lib not loaded
 *
 * 3     9/06/99 9:21p Jeff
 * lock video mode switching, don't set viewport when restoring (causing a
 * bunch of screen garbage)
 *
 * 2     9/05/99 9:41p Jeff
 * first checkin of Linux Screen manager
 *
 * $NoKeywords: $
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lnxscreenmode.h"
#include "pserror.h"
#include "args.h"

CLnxVideoModes LinuxVideoMode;

/*
typedef Bool (*VidModeQueryExtension_fp)(Display* dpy,int* event_base,int* error_base);
typedef Bool (*VidModeGetAllModeLines_fp)(Display* dpy,int screen,int* modecount,XF86VidModeModeInfo*** modelinesPtr);
typedef Bool (*VidModeSwitchToMode_fp)(Display* dpy,int screen,XF86VidModeModeInfo* modeline);
typedef Bool (*VidModeSetViewPort_fp)(Display* dpy,int screen,int x,int y);
typedef void (*VidModeFreeData_fp)(int num_modes,XF86VidModeModeInfo** modelinePtr);
typedef Bool (*VidModeGetModeLine_fp)(Display* dpy,int screen,int* dotclock,XF86VidModeModeLine* modeline);
typedef Bool (*VidModeLockModeSwitch_fp)(Display* dpy,int screen,int lock);

VidModeQueryExtension_fp VidModeQueryExtension;
VidModeGetAllModeLines_fp VidModeGetAllModeLines;
VidModeSwitchToMode_fp VidModeSwitchToMode;
VidModeSetViewPort_fp VidModeSetViewPort;
VidModeFreeData_fp VidModeFreeData;
VidModeGetModeLine_fp VidModeGetModeLine;
VidModeLockModeSwitch_fp VidModeLockModeSwitch;
*/

CLnxVideoModes::CLnxVideoModes() {
  m_Inited = false;
  m_NumVideoModes = 0;
  m_ModeInfoList = NULL;
  //	m_Display = NULL;
  m_VideoResolutionChanged = false;
  /*
          VidModeQueryExtension = NULL;
          VidModeGetAllModeLines = NULL;
          VidModeSwitchToMode = NULL;
          VidModeSetViewPort = NULL;
          VidModeFreeData = NULL;
          VidModeGetModeLine = NULL;
          VidModeLockModeSwitch = NULL;
  */
}

CLnxVideoModes::~CLnxVideoModes() {
  if (!m_Inited)
    return;

  // shutdown and free the memory
  RestoreVideoMode();

  //	VidModeFreeData(m_NumVideoModes,m_ModeInfoList);
}

// enumerate all the possible video modes
bool CLnxVideoModes::Init(void) // Display *dpy,int screen)
{
#if 0  // with SDL2, we'll just use FULLSCREEN_DESKTOP and never change the physical vidmode
  if (m_Inited)
    return true;

  //	m_Display = dpy;
  //	m_Screen = screen;
  m_NumVideoModes = 0;
  m_ModeInfoList = NULL;
  m_Inited = true;
  sdlflags = 0;
  /*
          if(!LoadLibraries())
          {
                  m_Inited = false;
                  fprintf(stdout,"LoadLib: Unable to load VideoMode libraries\n");
                  return false;
          }

          int dummy;
          if(!VidModeQueryExtension(dpy,&dummy,&dummy))
                  return false;

          if(!VidModeGetAllModeLines(m_Display,m_Screen,&m_NumVideoModes,&m_ModeInfoList))
          {
                  m_NumVideoModes = 0;
          }else
          {
  */

  const SDL_VideoInfo *vidInfo = NULL;

  sdlflags = SDL_HWSURFACE | SDL_FULLSCREEN;
  sdlflags = SDL_OPENGL | SDL_FULLSCREEN;
  if (FindArgChar("-windowed", 'w'))
    sdlflags &= ~SDL_FULLSCREEN;

  vidInfo = SDL_GetVideoInfo();

  m_ModeInfoList = SDL_ListModes(vidInfo->vfmt, sdlflags);
  if (m_ModeInfoList == NULL) {
    sdlflags &= ~SDL_FULLSCREEN;
    m_ModeInfoList = SDL_ListModes(vidInfo->vfmt, sdlflags); // try without fullscreen.
    if (m_ModeInfoList == NULL) {
      sdlflags = 0;
      m_ModeInfoList = SDL_ListModes(vidInfo->vfmt, sdlflags); // give me ANYTHING.
      if (m_ModeInfoList == NULL) {
        fprintf(stderr, "SDL: SDL_ListModes() failed.\n");
        return -3;
      } // if
    }   // if
  }     // if

  if (m_ModeInfoList == (SDL_Rect **)-1) // anything is fine.
  {
    mprintf(0, "Windowed surface is probably going to be used.");
    m_NumVideoModes = 0;
  } // if
  else {
    mprintf(0, "-------------------------\n");
    mprintf(0, "Supported Mode Lines:\n");
    for (int i = 0; m_ModeInfoList[i] != NULL; i++) {
      //,m_ModeInfoList[i]->hdisplay,m_ModeInfoList[i]->vdisplay);
      mprintf(0, "     Mode %d: %dX%d\n", i, m_ModeInfoList[i]->w, m_ModeInfoList[i]->h);
      m_NumVideoModes++;
    } // for
    mprintf(0, "-------------------------\n");
  } // else
#endif

  return true;
}

bool CLnxVideoModes::SwitchResolution(int width, int height) {
  /*
          if(!m_Inited)
                  return false;

          int i;
          for(i=0;i<m_NumVideoModes;i++)
          {
                  if(m_ModeInfoList[i]->hdisplay==width && m_ModeInfoList[i]->vdisplay==height)
                  {
                          // found a matching resolution, try to change to it
                          if(SwitchToMode(m_ModeInfoList[i]))
                          {
                                  fprintf(stdout,"Mode switch to %dX%d OK!\n",width,height);
                                  m_VideoResolutionChanged = (i==0)?false:true;
                                  return true;
                          }
                  }
          }

          return false;
  */
  return (true);
}

void CLnxVideoModes::RestoreVideoMode(void) {
  /*
          if(!m_Inited)
                  return;

          if(!m_VideoResolutionChanged)
                  return;

          // index 0 is the original mode
          if(m_NumVideoModes<=1)
                  return;

          m_VideoResolutionChanged = false;

          VidModeSwitchToMode(m_Display,m_Screen,m_ModeInfoList[0]);
  */
  return;
}

/*
bool CLnxVideoModes::SwitchToMode(XF86VidModeModeInfo *mode)
{
        if(!m_Inited)
                return false;

        if(!VidModeSwitchToMode(m_Display,m_Screen,mode))
        {
                fprintf(stdout,"Video: Unable to switch mode to %dX%d\n",mode->hdisplay,mode->vdisplay);
                return false;
        }

        VidModeSetViewPort(m_Display,m_Screen,0,0);
        return true;
}

bool CLnxVideoModes::QueryExtension(Display *dpy)
{
        if(!m_Inited)
                return false;

        int dummy;
        if(!VidModeQueryExtension(dpy,&dummy,&dummy))
                return false;
        return true;
}

void CLnxVideoModes::GetModeLine(Display *dpy,int screen,int *dotclock,XF86VidModeModeLine *modeline)
{
        if(!m_Inited)
                return;

        VidModeGetModeLine(dpy,screen,dotclock,modeline);
}
*/

void CLnxVideoModes::Lock(bool lock) {
  /*
          if(!m_Inited)
                  return;

          VidModeLockModeSwitch(m_Display,m_Screen,(lock)?1:0);
  */
}

bool CLnxVideoModes::LoadLibraries(void) {
  /*
          void *handle;
          char *libname = "OutrageDynXLib.so";
          handle = dlopen(libname,RTLD_NOW|RTLD_GLOBAL);
          if(!handle)
          {
                  fprintf(stderr,"Library Load Failed: %s (%s)\n",libname,dlerror());
                  return false;
          }

          VidModeQueryExtension = (VidModeQueryExtension_fp)dlsym(handle,"VidModeQueryExtension");
          VidModeGetAllModeLines = (VidModeGetAllModeLines_fp)dlsym(handle,"VidModeGetAllModeLines");
          VidModeSwitchToMode = (VidModeSwitchToMode_fp)dlsym(handle,"VidModeSwitchToMode");
          VidModeSetViewPort = (VidModeSetViewPort_fp)dlsym(handle,"VidModeSetViewPort");
          VidModeFreeData = (VidModeFreeData_fp)dlsym(handle,"VidModeFreeData");
          VidModeGetModeLine = (VidModeGetModeLine_fp)dlsym(handle,"VidModeGetModeLine");
          VidModeLockModeSwitch = (VidModeLockModeSwitch_fp)dlsym(handle,"VidModeLockModeSwitch");

          if(	!VidModeQueryExtension	||
                  !VidModeGetAllModeLines	||
                  !VidModeSwitchToMode	||
                  !VidModeSetViewPort		||
                  !VidModeFreeData		||
                  !VidModeGetModeLine		||
                  !VidModeLockModeSwitch)
          {
                  fprintf(stderr,"Symbol Resolve Error: %s\n",libname);
                  return false;
          }
  */
  return true;
}