/**
 * @file llwindowsdl.cpp
 * @brief SDL implementation of LLWindow class
 * @author This module has many fathers, and it shows.
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llwindowsdl.h"

#include "llwindowcallbacks.h"
#include "llkeyboardsdl.h"

#include "llerror.h"
#include "llgl.h"
#include "llstring.h"
#include "lldir.h"
#include "llfindlocale.h"

#ifdef LL_GLIB
#include <glib.h>
#endif

extern "C" {
# include "fontconfig/fontconfig.h"
}

#if LL_LINUX
// not necessarily available on random SDL platforms, so #if LL_LINUX
// for execv(), waitpid(), fork()
# include <unistd.h>
# include <sys/types.h>
# include <sys/wait.h>
# include <stdio.h>
#endif // LL_LINUX

extern BOOL gDebugWindowProc;

const S32 MAX_NUM_RESOLUTIONS = 200;

// static variable for ATI mouse cursor crash work-around:
static bool ATIbug = false;

//
// LLWindowSDL
//

#if LL_X11
# include <X11/Xutil.h>
#endif //LL_X11

// TOFU HACK -- (*exactly* the same hack as LLWindowMacOSX for a similar
// set of reasons): Stash a pointer to the LLWindowSDL object here and
// maintain in the constructor and destructor.  This assumes that there will
// be only one object of this class at any time.  Currently this is true.
static LLWindowSDL *gWindowImplementation = NULL;


void maybe_lock_display(void)
{
    if (gWindowImplementation && gWindowImplementation->Lock_Display) {
        gWindowImplementation->Lock_Display();
    }
}


void maybe_unlock_display(void)
{
    if (gWindowImplementation && gWindowImplementation->Unlock_Display) {
        gWindowImplementation->Unlock_Display();
    }
}


#if LL_X11
// static
Window LLWindowSDL::get_SDL_XWindowID(void)
{
    if (gWindowImplementation) {
        return gWindowImplementation->mSDL_XWindowID;
    }
    return None;
}

//static
Display* LLWindowSDL::get_SDL_Display(void)
{
    if (gWindowImplementation) {
        return gWindowImplementation->mSDL_Display;
    }
    return NULL;
}
#endif // LL_X11

#if LL_X11

// Clipboard handing via native X11, base on the implementation in Cool VL by Henri Beauchamp

namespace
{
    std::array<Atom, 3> gSupportedAtoms;

    Atom XA_CLIPBOARD;
    Atom XA_TARGETS;
    Atom PVT_PASTE_BUFFER;
    long const MAX_PASTE_BUFFER_SIZE = 16383;

    void filterSelectionRequest( XEvent aEvent )
    {
        auto *display = LLWindowSDL::getSDLDisplay();
        auto &request = aEvent.xselectionrequest;

        XSelectionEvent reply { SelectionNotify, aEvent.xany.serial, aEvent.xany.send_event, display,
                                request.requestor, request.selection, request.target,
                                request.property,request.time };

        if (request.target == XA_TARGETS)
        {
            XChangeProperty(display, request.requestor, request.property,
                            XA_ATOM, 32, PropModeReplace,
                            (unsigned char *) &gSupportedAtoms.front(), gSupportedAtoms.size());
        }
        else if (std::find(gSupportedAtoms.begin(), gSupportedAtoms.end(), request.target) !=
                 gSupportedAtoms.end())
        {
            std::string utf8;
            if (request.selection == XA_PRIMARY)
                utf8 = wstring_to_utf8str(gWindowImplementation->getPrimaryText());
            else
                utf8 = wstring_to_utf8str(gWindowImplementation->getSecondaryText());

            XChangeProperty(display, request.requestor, request.property,
                            request.target, 8, PropModeReplace,
                            (unsigned char *) utf8.c_str(), utf8.length());
        }
        else if (request.selection == XA_CLIPBOARD)
        {
            // Did not have what they wanted, so no property set
            reply.property = None;
        }
        else
            return;

        XSendEvent(request.display, request.requestor, False, NoEventMask, (XEvent *) &reply);
        XSync(display, False);
    }

    void filterSelectionClearRequest( XEvent aEvent )
    {
        auto &request = aEvent.xselectionrequest;
        if (request.selection == XA_PRIMARY)
            gWindowImplementation->clearPrimaryText();
        else if (request.selection == XA_CLIPBOARD)
            gWindowImplementation->clearSecondaryText();
    }

    int x11_clipboard_filter(void*, SDL_Event *evt)
    {
        Display *display = LLWindowSDL::getSDLDisplay();
        if (!display)
            return 1;

        if (evt->type != SDL_SYSWMEVENT)
            return 1;

        auto xevent = evt->syswm.msg->msg.x11.event;

        if (xevent.type == SelectionRequest)
            filterSelectionRequest( xevent );
        else if (xevent.type == SelectionClear)
            filterSelectionClearRequest( xevent );
        return 1;
    }

    bool grab_property(Display* display, Window window, Atom selection, Atom target)
    {
        if( !display )
            return false;

        maybe_lock_display();

        XDeleteProperty(display, window, PVT_PASTE_BUFFER);
        XFlush(display);

        XConvertSelection(display, selection, target, PVT_PASTE_BUFFER, window,  CurrentTime);

        // Unlock the connection so that the SDL event loop may function
        maybe_unlock_display();

        const auto start{ SDL_GetTicks() };
        const auto end{ start + 1000 };

        XEvent xevent {};
        bool response = false;

        do
        {
            SDL_Event event {};

            // Wait for an event
            SDL_WaitEvent(&event);

            // If the event is a window manager event
            if (event.type == SDL_SYSWMEVENT)
            {
                xevent = event.syswm.msg->msg.x11.event;

                if (xevent.type == SelectionNotify && xevent.xselection.requestor == window)
                    response = true;
            }
        } while (!response && SDL_GetTicks() < end );

        return response && xevent.xselection.property != None;
    }
}

void LLWindowSDL::initialiseX11Clipboard()
{
    if (!mSDL_Display)
        return;

    SDL_EventState(SDL_SYSWMEVENT, SDL_ENABLE);
    SDL_SetEventFilter(x11_clipboard_filter, nullptr);

    maybe_lock_display();

    XA_CLIPBOARD = XInternAtom(mSDL_Display, "CLIPBOARD", False);

    gSupportedAtoms[0] = XInternAtom(mSDL_Display, "UTF8_STRING", False);
    gSupportedAtoms[1] = XInternAtom(mSDL_Display, "COMPOUND_TEXT", False);
    gSupportedAtoms[2] = XA_STRING;

    // TARGETS atom
    XA_TARGETS = XInternAtom(mSDL_Display, "TARGETS", False);

    // SL_PASTE_BUFFER atom
    PVT_PASTE_BUFFER = XInternAtom(mSDL_Display, "FS_PASTE_BUFFER", False);

    maybe_unlock_display();
}

bool LLWindowSDL::getSelectionText( Atom aSelection, Atom aType, LLWString &text )
{
    if( !mSDL_Display )
        return false;

    if( !grab_property(mSDL_Display, mSDL_XWindowID, aSelection,aType ) )
        return false;

    maybe_lock_display();

    Atom type;
    int format{};
    unsigned long len{},remaining {};
    unsigned char* data = nullptr;
    int res = XGetWindowProperty(mSDL_Display, mSDL_XWindowID,
                                 PVT_PASTE_BUFFER, 0, MAX_PASTE_BUFFER_SIZE, False,
                                 AnyPropertyType, &type, &format, &len,
                                 &remaining, &data);
    if (data && len)
    {
        text = LLWString(
                utf8str_to_wstring(reinterpret_cast< char const *>( data ) )
        );
        XFree(data);
    }

    maybe_unlock_display();
    return res == Success;
}

bool LLWindowSDL::getSelectionText(Atom selection, LLWString& text)
{
    if (!mSDL_Display)
        return false;

    maybe_lock_display();

    Window owner = XGetSelectionOwner(mSDL_Display, selection);
    if (owner == None)
    {
        if (selection == XA_PRIMARY)
        {
            owner = DefaultRootWindow(mSDL_Display);
            selection = XA_CUT_BUFFER0;
        }
        else
        {
            maybe_unlock_display();
            return false;
        }
    }

    maybe_unlock_display();

    for( Atom atom : gSupportedAtoms )
    {
        if(getSelectionText(selection, atom, text ) )
            return true;
    }

    return false;
}

bool LLWindowSDL::setSelectionText(Atom selection, const LLWString& text)
{
    maybe_lock_display();

    if (selection == XA_PRIMARY)
    {
        std::string utf8 = wstring_to_utf8str(text);
        XStoreBytes(mSDL_Display, utf8.c_str(), utf8.length() + 1);
        mPrimaryClipboard = text;
    }
    else
        mSecondaryClipboard = text;

    XSetSelectionOwner(mSDL_Display, selection, mSDL_XWindowID, CurrentTime);

    auto owner = XGetSelectionOwner(mSDL_Display, selection);

    maybe_unlock_display();

    return owner == mSDL_XWindowID;
}

Display* LLWindowSDL::getSDLDisplay()
{
    if (gWindowImplementation)
        return gWindowImplementation->mSDL_Display;
    return nullptr;
}

#endif


LLWindowSDL::LLWindowSDL(LLWindowCallbacks* callbacks,
                         const std::string& title, S32 x, S32 y, S32 width,
                         S32 height, U32 flags,
                         BOOL fullscreen, BOOL clearBg,
                         BOOL disable_vsync, BOOL use_gl,
                         BOOL ignore_pixel_depth, U32 fsaa_samples)
        : LLWindow(callbacks, fullscreen, flags),
        Lock_Display(NULL),
        //Unlock_Display(NULL), mGamma(1.0f)
        Unlock_Display(NULL), mGamma(1.0f)
{
    // Initialize the keyboard
    gKeyboard = new LLKeyboardSDL();
    gKeyboard->setCallbacks(callbacks);
    // Note that we can't set up key-repeat until after SDL has init'd video

    // Ignore use_gl for now, only used for drones on PC
    mWindow = NULL;
    mContext = {};
    mNeedsResize = FALSE;
    mOverrideAspectRatio = 0.f;
    mGrabbyKeyFlags = 0;
    mReallyCapturedCount = 0;
    mHaveInputFocus = -1;
    mIsMinimized = -1;
    mFSAASamples = fsaa_samples;

#if LL_X11
    mSDL_XWindowID = None;
    mSDL_Display = NULL;
#endif // LL_X11

    // Assume 4:3 aspect ratio until we know better
    mOriginalAspectRatio = 1024.0 / 768.0;

    if (title.empty())
        mWindowTitle = "SDL Window";  // *FIX: (?)
    else
        mWindowTitle = title;

    // Create the GL context and set it up for windowed or fullscreen, as appropriate.
    if(createContext(x, y, width, height, 32, fullscreen, disable_vsync))
    {
        gGLManager.initGL();

        //start with arrow cursor
        initCursors();
        setCursor( UI_CURSOR_ARROW );
    }

    stop_glerror();

    // Stash an object pointer for OSMessageBox()
    gWindowImplementation = this;

#if LL_X11
    mFlashing = FALSE;
    initialiseX11Clipboard();
#endif // LL_X11

    mKeyVirtualKey = 0;
    mKeyModifiers = KMOD_NONE;
}

static SDL_Surface *Load_BMP_Resource(const char *basename)
{
    const int PATH_BUFFER_SIZE=1000;
    char path_buffer[PATH_BUFFER_SIZE]; /* Flawfinder: ignore */

    // Figure out where our BMP is living on the disk
    snprintf(path_buffer, PATH_BUFFER_SIZE-1, "%s%sres-sdl%s%s",
             gDirUtilp->getAppRODataDir().c_str(),
             gDirUtilp->getDirDelimiter().c_str(),
             gDirUtilp->getDirDelimiter().c_str(),
             basename);
    path_buffer[PATH_BUFFER_SIZE-1] = '\0';

    return SDL_LoadBMP(path_buffer);
}

#if LL_X11
// This is an XFree86/XOrg-specific hack for detecting the amount of Video RAM
// on this machine.  It works by searching /var/log/var/log/Xorg.?.log or
// /var/log/XFree86.?.log for a ': (VideoRAM ?|Memory): (%d+) kB' regex, where
// '?' is the X11 display number derived from $DISPLAY
static int x11_detect_VRAM_kb_fp(FILE *fp, const char *prefix_str)
{
    const int line_buf_size = 1000;
    char line_buf[line_buf_size];
    while (fgets(line_buf, line_buf_size, fp))
    {
        //LL_DEBUGS() << "XLOG: " << line_buf << LL_ENDL;

        // Why the ad-hoc parser instead of using a regex?  Our
        // favourite regex implementation - libboost_regex - is
        // quite a heavy and troublesome dependency for the client, so
        // it seems a shame to introduce it for such a simple task.
        // *FIXME: libboost_regex is a dependency now anyway, so we may
        // as well use it instead of this hand-rolled nonsense.
        const char *part1_template = prefix_str;
        const char part2_template[] = " kB";
        char *part1 = strstr(line_buf, part1_template);
        if (part1) // found start of matching line
        {
            part1 = &part1[strlen(part1_template)]; // -> after
            char *part2 = strstr(part1, part2_template);
            if (part2) // found end of matching line
            {
                // now everything between part1 and part2 is
                // supposed to be numeric, describing the
                // number of kB of Video RAM supported
                int rtn = 0;
                for (; part1 < part2; ++part1)
                {
                    if (*part1 < '0' || *part1 > '9')
                    {
                        // unexpected char, abort parse
                        rtn = 0;
                        break;
                    }
                    rtn *= 10;
                    rtn += (*part1) - '0';
                }
                if (rtn > 0)
                {
                    // got the kB number.  return it now.
                    return rtn;
                }
            }
        }
    }
    return 0; // 'could not detect'
}

static int x11_detect_VRAM_kb()
{
    std::string x_log_location("/var/log/");
    std::string fname;
    int rtn = 0; // 'could not detect'
    int display_num = 0;
    FILE *fp;
    char *display_env = getenv("DISPLAY"); // e.g. :0 or :0.0 or :1.0 etc
    // parse DISPLAY number so we can go grab the right log file
    if (display_env[0] == ':' &&
        display_env[1] >= '0' && display_env[1] <= '9')
    {
        display_num = display_env[1] - '0';
    }

    // *TODO: we could be smarter and see which of Xorg/XFree86 has the
    // freshest time-stamp.

    // Try Xorg log first
    fname = x_log_location;
    fname += "Xorg.";
    fname += ('0' + display_num);
    fname += ".log";
    fp = fopen(fname.c_str(), "r");
    if (fp)
    {
        LL_INFOS() << "Looking in " << fname
                   << " for VRAM info..." << LL_ENDL;
        rtn = x11_detect_VRAM_kb_fp(fp, ": VideoRAM: ");
        fclose(fp);
        if (0 == rtn)
        {
            fp = fopen(fname.c_str(), "r");
            if (fp)
            {
                rtn = x11_detect_VRAM_kb_fp(fp, ": Video RAM: ");
                fclose(fp);
                if (0 == rtn)
                {
                    fp = fopen(fname.c_str(), "r");
                    if (fp)
                    {
                        rtn = x11_detect_VRAM_kb_fp(fp, ": Memory: ");
                        fclose(fp);
                    }
                }
            }
        }
    }
    else
    {
        LL_INFOS() << "Could not open " << fname
                   << " - skipped." << LL_ENDL;
        // Try old XFree86 log otherwise
        fname = x_log_location;
        fname += "XFree86.";
        fname += ('0' + display_num);
        fname += ".log";
        fp = fopen(fname.c_str(), "r");
        if (fp)
        {
            LL_INFOS() << "Looking in " << fname
                       << " for VRAM info..." << LL_ENDL;
            rtn = x11_detect_VRAM_kb_fp(fp, ": VideoRAM: ");
            fclose(fp);
            if (0 == rtn)
            {
                fp = fopen(fname.c_str(), "r");
                if (fp)
                {
                    rtn = x11_detect_VRAM_kb_fp(fp, ": Memory: ");
                    fclose(fp);
                }
            }
        }
        else
        {
            LL_INFOS() << "Could not open " << fname
                       << " - skipped." << LL_ENDL;
        }
    }
    return rtn;
}
#endif // LL_X11

void LLWindowSDL::setTitle(const std::string title)
{
    SDL_SetWindowTitle( mWindow, title.c_str() );
}

void LLWindowSDL::tryFindFullscreenSize( int &width, int &height )
{
    LL_INFOS() << "createContext: setting up fullscreen " << width << "x" << height << LL_ENDL;

    // If the requested width or height is 0, find the best default for the monitor.
    if((width == 0) || (height == 0))
    {
        // Scan through the list of modes, looking for one which has:
        //      height between 700 and 800
        //      aspect ratio closest to the user's original mode
        S32 resolutionCount = 0;
        LLWindowResolution *resolutionList = getSupportedResolutions(resolutionCount);

        if(resolutionList != NULL)
        {
            F32 closestAspect = 0;
            U32 closestHeight = 0;
            U32 closestWidth = 0;
            int i;

            LL_INFOS() << "createContext: searching for a display mode, original aspect is " << mOriginalAspectRatio << LL_ENDL;

            for(i=0; i < resolutionCount; i++)
            {
                F32 aspect = (F32)resolutionList[i].mWidth / (F32)resolutionList[i].mHeight;

                LL_INFOS() << "createContext: width " << resolutionList[i].mWidth << " height " << resolutionList[i].mHeight << " aspect " << aspect << LL_ENDL;

                if( (resolutionList[i].mHeight >= 700) && (resolutionList[i].mHeight <= 800) &&
                    (fabs(aspect - mOriginalAspectRatio) < fabs(closestAspect - mOriginalAspectRatio)))
                {
                    LL_INFOS() << " (new closest mode) " << LL_ENDL;

                    // This is the closest mode we've seen yet.
                    closestWidth = resolutionList[i].mWidth;
                    closestHeight = resolutionList[i].mHeight;
                    closestAspect = aspect;
                }
            }

            width = closestWidth;
            height = closestHeight;
        }
    }

    if((width == 0) || (height == 0))
    {
        // Mode search failed for some reason.  Use the old-school default.
        width = 1024;
        height = 768;
    }
}

BOOL LLWindowSDL::createContext(int x, int y, int width, int height, int bits, BOOL fullscreen, BOOL disable_vsync)
{
    //bool          glneedsinit = false;

    LL_INFOS() << "createContext, fullscreen=" << fullscreen <<
               " size=" << width << "x" << height << LL_ENDL;

    // captures don't survive contexts
    mGrabbyKeyFlags = 0;
    mReallyCapturedCount = 0;

    std::initializer_list<std::tuple< char const*, char const * > > hintList =
            {
                    {SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR,"0"},
                    {SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH,"1"},
                    {SDL_HINT_IME_INTERNAL_EDITING,"1"}
            };

    for( auto hint: hintList )
    {
        SDL_SetHint( std::get<0>(hint), std::get<1>(hint));
    }

    std::initializer_list<std::tuple<uint32_t, char const*, bool>> initList=
            { {SDL_INIT_VIDEO,"SDL_INIT_VIDEO", true},
              {SDL_INIT_AUDIO,"SDL_INIT_AUDIO", false},
              {SDL_INIT_GAMECONTROLLER,"SDL_INIT_GAMECONTROLLER", false},
              {SDL_INIT_SENSOR,"SDL_INIT_SENSOR", false}
            };

    for( auto subSystem : initList)
    {
        if( SDL_InitSubSystem( std::get<0>(subSystem) ) < 0 )
        {
            LL_WARNS() << "SDL_InitSubSystem for " << std::get<1>(subSystem) << " failed " << SDL_GetError() << LL_ENDL;

            if( std::get<2>(subSystem))
                setupFailure("SDL_Init() failure", "error", OSMB_OK);

        }
    }

    SDL_version c_sdl_version;
    SDL_VERSION(&c_sdl_version);
    LL_INFOS() << "Compiled against SDL "
               << int(c_sdl_version.major) << "."
               << int(c_sdl_version.minor) << "."
               << int(c_sdl_version.patch) << LL_ENDL;
    SDL_version r_sdl_version;
    SDL_GetVersion(&r_sdl_version);
    LL_INFOS() << " Running against SDL "
               << int(r_sdl_version.major) << "."
               << int(r_sdl_version.minor) << "."
               << int(r_sdl_version.patch) << LL_ENDL;

    if (width == 0)
        width = 1024;
    if (height == 0)
        width = 768;

    mFullscreen = fullscreen;

    int sdlflags = SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE;

    if( mFullscreen )
    {
        sdlflags |= SDL_WINDOW_FULLSCREEN;
        tryFindFullscreenSize( width, height );
    }

    mSDLFlags = sdlflags;

    GLint redBits{8}, greenBits{8}, blueBits{8}, alphaBits{8};

    GLint depthBits{(bits <= 16) ? 16 : 24}, stencilBits{8};

    if (getenv("LL_GL_NO_STENCIL"))
        stencilBits = 0;

    SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, alphaBits);
    SDL_GL_SetAttribute(SDL_GL_RED_SIZE,   redBits);
    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, greenBits);
    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  blueBits);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, depthBits );

    // We need stencil support for a few (minor) things.
    if (stencilBits)
        SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, stencilBits);
    // *FIX: try to toggle vsync here?

    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

    if (mFSAASamples > 0)
    {
        SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
        SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, mFSAASamples);
    }

    SDL_GL_SetAttribute(SDL_GL_SHARE_WITH_CURRENT_CONTEXT, 1);
    mWindow = SDL_CreateWindow( mWindowTitle.c_str(), SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, mSDLFlags );

    if( mWindow )
    {
        mContext = SDL_GL_CreateContext( mWindow );

        if( mContext == 0 )
        {
            LL_WARNS() << "Cannot create GL context " << SDL_GetError() << LL_ENDL;
            setupFailure("GL Context creation error creation error", "Error", OSMB_OK);
            return FALSE;
        }
        // SDL_GL_SetSwapInterval(1);
        mSurface = SDL_GetWindowSurface( mWindow );
    }


    if( mFullscreen )
    {
        if (mSurface)
        {
            mFullscreen = TRUE;
            mFullscreenWidth = mSurface->w;
            mFullscreenHeight = mSurface->h;
            mFullscreenBits    = mSurface->format->BitsPerPixel;
            mFullscreenRefresh = -1;

            LL_INFOS() << "Running at " << mFullscreenWidth
                       << "x"   << mFullscreenHeight
                       << "x"   << mFullscreenBits
                       << " @ " << mFullscreenRefresh
                       << LL_ENDL;
        }
        else
        {
            LL_WARNS() << "createContext: fullscreen creation failure. SDL: " << SDL_GetError() << LL_ENDL;
            // No fullscreen support
            mFullscreen = FALSE;
            mFullscreenWidth   = -1;
            mFullscreenHeight  = -1;
            mFullscreenBits    = -1;
            mFullscreenRefresh = -1;

            std::string error = llformat("Unable to run fullscreen at %d x %d.\nRunning in window.", width, height);
            OSMessageBox(error, "Error", OSMB_OK);
            return FALSE;
        }
    }
    else
    {
        if (!mWindow)
        {
            LL_WARNS() << "createContext: window creation failure. SDL: " << SDL_GetError() << LL_ENDL;
            setupFailure("Window creation error", "Error", OSMB_OK);
            return FALSE;
        }
    }

    // Set the application icon.
    SDL_Surface *bmpsurface;
    bmpsurface = Load_BMP_Resource("ll_icon.BMP");
    if (bmpsurface)
    {
        SDL_SetWindowIcon(mWindow, bmpsurface);
        SDL_FreeSurface(bmpsurface);
        bmpsurface = NULL;
    }

    // Detect video memory size.
# if LL_X11
    gGLManager.mVRAM = x11_detect_VRAM_kb() / 1024;
    if (gGLManager.mVRAM != 0)
    {
        LL_INFOS() << "X11 log-parser detected " << gGLManager.mVRAM << "MB VRAM." << LL_ENDL;
    } else
# endif // LL_X11
    {
        // fallback to letting SDL detect VRAM.
        // note: I've not seen SDL's detection ever actually find
        // VRAM != 0, but if SDL *does* detect it then that's a bonus.
        gGLManager.mVRAM = 0;
        if (gGLManager.mVRAM != 0)
        {
            LL_INFOS() << "SDL detected " << gGLManager.mVRAM << "MB VRAM." << LL_ENDL;
        }
    }
    // If VRAM is not detected, that is handled later

    // *TODO: Now would be an appropriate time to check for some
    // explicitly unsupported cards.
    //const char* RENDERER = (const char*) glGetString(GL_RENDERER);

    SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &redBits);
    SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &greenBits);
    SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &blueBits);
    SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &alphaBits);
    SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &depthBits);
    SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE, &stencilBits);

    LL_INFOS() << "GL buffer:" << LL_ENDL;
    LL_INFOS() << "  Red Bits " << S32(redBits) << LL_ENDL;
    LL_INFOS() << "  Green Bits " << S32(greenBits) << LL_ENDL;
    LL_INFOS() << "  Blue Bits " << S32(blueBits) << LL_ENDL;
    LL_INFOS() << "  Alpha Bits " << S32(alphaBits) << LL_ENDL;
    LL_INFOS() << "  Depth Bits " << S32(depthBits) << LL_ENDL;
    LL_INFOS() << "  Stencil Bits " << S32(stencilBits) << LL_ENDL;

    GLint colorBits = redBits + greenBits + blueBits + alphaBits;
    // fixme: actually, it's REALLY important for picking that we get at
    // least 8 bits each of red,green,blue.  Alpha we can be a bit more
    // relaxed about if we have to.
    if (colorBits < 32)
    {
        close();
        setupFailure(
                "Second Life requires True Color (32-bit) to run in a window.\n"
                "Please go to Control Panels -> Display -> Settings and\n"
                "set the screen to 32-bit color.\n"
                "Alternately, if you choose to run fullscreen, Second Life\n"
                "will automatically adjust the screen each time it runs.",
                "Error",
                OSMB_OK);
        return FALSE;
    }

#if LL_X11
    /* Grab the window manager specific information */
    SDL_SysWMinfo info;
    SDL_VERSION(&info.version);
    if ( SDL_GetWindowWMInfo(mWindow, &info) )
    {
        /* Save the information for later use */
        if ( info.subsystem == SDL_SYSWM_X11 )
        {
            mSDL_Display = info.info.x11.display;
            mSDL_XWindowID = info.info.x11.window;
        }
        else
        {
            LL_WARNS() << "We're not running under X11?  Wild."
                       << LL_ENDL;
        }
    }
    else
    {
        LL_WARNS() << "We're not running under any known WM.  Wild."
                   << LL_ENDL;
    }
#endif // LL_X11


    SDL_StartTextInput();
    //make sure multisampling is disabled by default
    glDisable(GL_MULTISAMPLE_ARB);

    // Don't need to get the current gamma, since there's a call that restores it to the system defaults.
    return TRUE;
}


// changing fullscreen resolution, or switching between windowed and fullscreen mode.
BOOL LLWindowSDL::switchContext(BOOL fullscreen, const LLCoordScreen &size, BOOL disable_vsync, const LLCoordScreen * const posp)
{
    const BOOL needsRebuild = TRUE;  // Just nuke the context and start over.
    BOOL result = true;

    LL_INFOS() << "switchContext, fullscreen=" << fullscreen << LL_ENDL;
    stop_glerror();
    if(needsRebuild)
    {
        destroyContext();
        result = createContext(0, 0, size.mX, size.mY, 0, fullscreen, disable_vsync);
        if (result)
        {
            gGLManager.initGL();

            //start with arrow cursor
            initCursors();
            setCursor( UI_CURSOR_ARROW );
        }
    }

    stop_glerror();

    return result;
}

void LLWindowSDL::destroyContext()
{
    LL_INFOS() << "destroyContext begins" << LL_ENDL;

    SDL_StopTextInput();
#if LL_X11
    mSDL_Display = NULL;
    mSDL_XWindowID = None;
    Lock_Display = NULL;
    Unlock_Display = NULL;
#endif // LL_X11

    // Clean up remaining GL state before blowing away window
    LL_INFOS() << "shutdownGL begins" << LL_ENDL;
    gGLManager.shutdownGL();
    LL_INFOS() << "SDL_QuitSS/VID begins" << LL_ENDL;
    SDL_QuitSubSystem(SDL_INIT_VIDEO);  // *FIX: this might be risky...

    mWindow = NULL;
}

LLWindowSDL::~LLWindowSDL()
{
    quitCursors();
    destroyContext();

    if(mSupportedResolutions != NULL)
    {
        delete []mSupportedResolutions;
    }

    gWindowImplementation = NULL;
}


void LLWindowSDL::show()
{
    // *FIX: What to do with SDL?
}

void LLWindowSDL::hide()
{
    // *FIX: What to do with SDL?
}

//virtual
void LLWindowSDL::minimize()
{
    // *FIX: What to do with SDL?
}

//virtual
void LLWindowSDL::restore()
{
    // *FIX: What to do with SDL?
}


// close() destroys all OS-specific code associated with a window.
// Usually called from LLWindowManager::destroyWindow()
void LLWindowSDL::close()
{
    // Is window is already closed?
    //  if (!mWindow)
    //  {
    //      return;
    //  }

    // Make sure cursor is visible and we haven't mangled the clipping state.
    setMouseClipping(FALSE);
    showCursor();

    destroyContext();
}

BOOL LLWindowSDL::isValid()
{
    return (mWindow != NULL);
}

BOOL LLWindowSDL::getVisible()
{
    BOOL result = FALSE;

    // *FIX: This isn't really right...
    // Then what is?
    if (mWindow)
    {
        result = TRUE;
    }

    return(result);
}

BOOL LLWindowSDL::getMinimized()
{
    BOOL result = FALSE;

    if (mWindow && (1 == mIsMinimized))
    {
        result = TRUE;
    }
    return(result);
}

BOOL LLWindowSDL::getMaximized()
{
    BOOL result = FALSE;

    if (mWindow)
    {
        // TODO
    }

    return(result);
}

BOOL LLWindowSDL::maximize()
{
    // TODO
    return FALSE;
}

BOOL LLWindowSDL::getFullscreen()
{
    return mFullscreen;
}

BOOL LLWindowSDL::getPosition(LLCoordScreen *position)
{
    // *FIX: can anything be done with this?
    position->mX = 0;
    position->mY = 0;
    return TRUE;
}

BOOL LLWindowSDL::getSize(LLCoordScreen *size)
{
    if (mSurface)
    {
        size->mX = mSurface->w;
        size->mY = mSurface->h;
        return (TRUE);
    }

    return (FALSE);
}

BOOL LLWindowSDL::getSize(LLCoordWindow *size)
{
    if (mSurface)
    {
        size->mX = mSurface->w;
        size->mY = mSurface->h;
        return (TRUE);
    }

    return (FALSE);
}

BOOL LLWindowSDL::setPosition(const LLCoordScreen position)
{
    if(mWindow)
    {
        // *FIX: (?)
        //MacMoveWindow(mWindow, position.mX, position.mY, false);
    }

    return TRUE;
}

template< typename T > bool setSizeImpl( const T& newSize, SDL_Window *pWin )
{
    if( !pWin )
        return false;

    auto nFlags = SDL_GetWindowFlags( pWin );

    if( nFlags & SDL_WINDOW_MAXIMIZED )
        SDL_RestoreWindow( pWin );


    SDL_SetWindowSize( pWin, newSize.mX, newSize.mY );
    SDL_Event event;
    event.type = SDL_WINDOWEVENT;
    event.window.event = SDL_WINDOWEVENT_RESIZED;
    event.window.windowID = SDL_GetWindowID( pWin );
    event.window.data1 = newSize.mX;
    event.window.data2 = newSize.mY;
    SDL_PushEvent( &event );

    return true;
}

BOOL LLWindowSDL::setSizeImpl(const LLCoordScreen size)
{
    return ::setSizeImpl( size, mWindow );
}

BOOL LLWindowSDL::setSizeImpl(const LLCoordWindow size)
{
    return ::setSizeImpl( size, mWindow );
}


void LLWindowSDL::swapBuffers()
{
    if (mWindow)
    {
        SDL_GL_SwapWindow( mWindow );
    }
}

U32 LLWindowSDL::getFSAASamples()
{
    return mFSAASamples;
}

void LLWindowSDL::setFSAASamples(const U32 samples)
{
    mFSAASamples = samples;
}

F32 LLWindowSDL::getGamma()
{
    return 1/mGamma;
}

BOOL LLWindowSDL::restoreGamma()
{
    //CGDisplayRestoreColorSyncSettings();
    // SDL_SetGamma(1.0f, 1.0f, 1.0f);
    return true;
}

BOOL LLWindowSDL::setGamma(const F32 gamma)
{
    mGamma = gamma;
    if (mGamma == 0) mGamma = 0.1f;
    mGamma = 1/mGamma;
    // SDL_SetGamma(mGamma, mGamma, mGamma);
    return true;
}

BOOL LLWindowSDL::isCursorHidden()
{
    return mCursorHidden;
}



// Constrains the mouse to the window.
void LLWindowSDL::setMouseClipping( BOOL b )
{
    //SDL_WM_GrabInput(b ? SDL_GRAB_ON : SDL_GRAB_OFF);
}

// virtual
void LLWindowSDL::setMinSize(U32 min_width, U32 min_height, bool enforce_immediately)
{
    LLWindow::setMinSize(min_width, min_height, enforce_immediately);

#if LL_X11
    // Set the minimum size limits for X11 window
    // so the window manager doesn't allow resizing below those limits.
    XSizeHints* hints = XAllocSizeHints();
    hints->flags |= PMinSize;
    hints->min_width = mMinWindowWidth;
    hints->min_height = mMinWindowHeight;

    XSetWMNormalHints(mSDL_Display, mSDL_XWindowID, hints);

    XFree(hints);
#endif
}

BOOL LLWindowSDL::setCursorPosition(const LLCoordWindow position)
{
    BOOL result = TRUE;
    LLCoordScreen screen_pos;

    if (!convertCoords(position, &screen_pos))
    {
        return FALSE;
    }

    //LL_INFOS() << "setCursorPosition(" << screen_pos.mX << ", " << screen_pos.mY << ")" << LL_ENDL;

    // do the actual forced cursor move.
    SDL_WarpMouseInWindow(mWindow, screen_pos.mX, screen_pos.mY);

    //LL_INFOS() << llformat("llcw %d,%d -> scr %d,%d", position.mX, position.mY, screen_pos.mX, screen_pos.mY) << LL_ENDL;

    return result;
}

BOOL LLWindowSDL::getCursorPosition(LLCoordWindow *position)
{
    //Point cursor_point;
    LLCoordScreen screen_pos;

    //GetMouse(&cursor_point);
    int x, y;
    SDL_GetMouseState(&x, &y);

    screen_pos.mX = x;
    screen_pos.mY = y;

    return convertCoords(screen_pos, position);
}


F32 LLWindowSDL::getNativeAspectRatio()
{
    // MBW -- there are a couple of bad assumptions here.  One is that the display list won't include
    //      ridiculous resolutions nobody would ever use.  The other is that the list is in order.

    // New assumptions:
    // - pixels are square (the only reasonable choice, really)
    // - The user runs their display at a native resolution, so the resolution of the display
    //    when the app is launched has an aspect ratio that matches the monitor.

    //RN: actually, the assumption that there are no ridiculous resolutions (above the display's native capabilities) has
    // been born out in my experience.
    // Pixels are often not square (just ask the people who run their LCDs at 1024x768 or 800x600 when running fullscreen, like me)
    // The ordering of display list is a blind assumption though, so we should check for max values
    // Things might be different on the Mac though, so I'll defer to MBW

    // The constructor for this class grabs the aspect ratio of the monitor before doing any resolution
    // switching, and stashes it in mOriginalAspectRatio.  Here, we just return it.

    if (mOverrideAspectRatio > 0.f)
    {
        return mOverrideAspectRatio;
    }

    return mOriginalAspectRatio;
}

F32 LLWindowSDL::getPixelAspectRatio()
{
    F32 pixel_aspect = 1.f;
    if (getFullscreen())
    {
        LLCoordScreen screen_size;
        if (getSize(&screen_size))
        {
            pixel_aspect = getNativeAspectRatio() * (F32)screen_size.mY / (F32)screen_size.mX;
        }
    }

    return pixel_aspect;
}


// This is to support 'temporarily windowed' mode so that
// dialogs are still usable in fullscreen.
void LLWindowSDL::beforeDialog()
{
    bool running_x11 = false;
#if LL_X11
    running_x11 = (mSDL_XWindowID != None);
#endif //LL_X11

    LL_INFOS() << "LLWindowSDL::beforeDialog()" << LL_ENDL;

    if (SDLReallyCaptureInput(FALSE)) // must ungrab input so popup works!
    {
        if (mFullscreen)
        {
            // need to temporarily go non-fullscreen; bless SDL
            // for providing a SDL_WM_ToggleFullScreen() - though
            // it only works in X11
            if (running_x11 && mWindow)
            {
                SDL_SetWindowFullscreen( mWindow, 0 );
            }
        }
    }

#if LL_X11
    if (mSDL_Display)
    {
        // Everything that we/SDL asked for should happen before we
        // potentially hand control over to GTK.
        maybe_lock_display();
        XSync(mSDL_Display, False);
        maybe_unlock_display();
    }
#endif // LL_X11

    maybe_lock_display();
}

void LLWindowSDL::afterDialog()
{
    bool running_x11 = false;
#if LL_X11
    running_x11 = (mSDL_XWindowID != None);
#endif //LL_X11

    LL_INFOS() << "LLWindowSDL::afterDialog()" << LL_ENDL;

    maybe_unlock_display();

    if (mFullscreen)
    {
        // need to restore fullscreen mode after dialog - only works
        // in X11
        if (running_x11 && mWindow)
        {
            SDL_SetWindowFullscreen( mWindow, 0 );
        }
    }
}


#if LL_X11
// set/reset the XWMHints flag for 'urgency' that usually makes the icon flash
void LLWindowSDL::x11_set_urgent(BOOL urgent)
{
    if (mSDL_Display && !mFullscreen)
    {
        XWMHints *wm_hints;

        LL_INFOS() << "X11 hint for urgency, " << urgent << LL_ENDL;

        maybe_lock_display();
        wm_hints = XGetWMHints(mSDL_Display, mSDL_XWindowID);
        if (!wm_hints)
            wm_hints = XAllocWMHints();

        if (urgent)
            wm_hints->flags |= XUrgencyHint;
        else
            wm_hints->flags &= ~XUrgencyHint;

        XSetWMHints(mSDL_Display, mSDL_XWindowID, wm_hints);
        XFree(wm_hints);
        XSync(mSDL_Display, False);
        maybe_unlock_display();
    }
}
#endif // LL_X11

void LLWindowSDL::flashIcon(F32 seconds)
{
    if (getMinimized())
    {
#if !LL_X11
        LL_INFOS() << "Stub LLWindowSDL::flashIcon(" << seconds << ")" << LL_ENDL;
#else
        LL_INFOS() << "X11 LLWindowSDL::flashIcon(" << seconds << ")" << LL_ENDL;

        F32 remaining_time = mFlashTimer.getRemainingTimeF32();
        if (remaining_time < seconds)
            remaining_time = seconds;
        mFlashTimer.reset();
        mFlashTimer.setTimerExpirySec(remaining_time);

        x11_set_urgent(TRUE);
        mFlashing = TRUE;
#endif // LL_X11
    }
}

BOOL LLWindowSDL::isClipboardTextAvailable()
{
    return mSDL_Display && XGetSelectionOwner(mSDL_Display, XA_CLIPBOARD) != None;
}

BOOL LLWindowSDL::pasteTextFromClipboard(LLWString &dst)
{
    return getSelectionText(XA_CLIPBOARD, dst);
}

BOOL LLWindowSDL::copyTextToClipboard(const LLWString &s)
{
    return setSelectionText(XA_CLIPBOARD, s);
}

BOOL LLWindowSDL::isPrimaryTextAvailable()
{
    LLWString text;
    return getSelectionText(XA_PRIMARY, text) && !text.empty();
}

BOOL LLWindowSDL::pasteTextFromPrimary(LLWString &dst)
{
    return getSelectionText(XA_PRIMARY, dst);
}

BOOL LLWindowSDL::copyTextToPrimary(const LLWString &s)
{
    return setSelectionText(XA_PRIMARY, s);
}

LLWindow::LLWindowResolution* LLWindowSDL::getSupportedResolutions(S32 &num_resolutions)
{
    if (!mSupportedResolutions)
    {
        mSupportedResolutions = new LLWindowResolution[MAX_NUM_RESOLUTIONS];
        mNumSupportedResolutions = 0;

        // <FS:ND> Use display no from mWindow/mSurface here?
        int max = SDL_GetNumDisplayModes(0);
        max = llclamp( max, 0, MAX_NUM_RESOLUTIONS );

        for( int i =0; i < max; ++i )
        {
            SDL_DisplayMode mode = { SDL_PIXELFORMAT_UNKNOWN, 0, 0, 0, 0 };
            if (SDL_GetDisplayMode( 0 , i, &mode) != 0)
            {
                continue;
            }

            int w = mode.w;
            int h = mode.h;
            if ((w >= 800) && (h >= 600))
            {
                // make sure we don't add the same resolution multiple times!
                if ( (mNumSupportedResolutions == 0) ||
                     ((mSupportedResolutions[mNumSupportedResolutions-1].mWidth != w) &&
                      (mSupportedResolutions[mNumSupportedResolutions-1].mHeight != h)) )
                {
                    mSupportedResolutions[mNumSupportedResolutions].mWidth = w;
                    mSupportedResolutions[mNumSupportedResolutions].mHeight = h;
                    mNumSupportedResolutions++;
                }
            }
        }
    }

    num_resolutions = mNumSupportedResolutions;
    return mSupportedResolutions;
}

BOOL LLWindowSDL::convertCoords(LLCoordGL from, LLCoordWindow *to)
{
    if (!to)
        return FALSE;

    to->mX = from.mX;
    to->mY = mSurface->h - from.mY - 1;

    return TRUE;
}

BOOL LLWindowSDL::convertCoords(LLCoordWindow from, LLCoordGL* to)
{
    if (!to)
        return FALSE;

    to->mX = from.mX;
    to->mY = mSurface->h - from.mY - 1;

    return TRUE;
}

BOOL LLWindowSDL::convertCoords(LLCoordScreen from, LLCoordWindow* to)
{
    if (!to)
        return FALSE;

    // In the fullscreen case, window and screen coordinates are the same.
    to->mX = from.mX;
    to->mY = from.mY;
    return (TRUE);
}

BOOL LLWindowSDL::convertCoords(LLCoordWindow from, LLCoordScreen *to)
{
    if (!to)
        return FALSE;

    // In the fullscreen case, window and screen coordinates are the same.
    to->mX = from.mX;
    to->mY = from.mY;
    return (TRUE);
}

BOOL LLWindowSDL::convertCoords(LLCoordScreen from, LLCoordGL *to)
{
    LLCoordWindow window_coord;

    return(convertCoords(from, &window_coord) && convertCoords(window_coord, to));
}

BOOL LLWindowSDL::convertCoords(LLCoordGL from, LLCoordScreen *to)
{
    LLCoordWindow window_coord;

    return(convertCoords(from, &window_coord) && convertCoords(window_coord, to));
}




void LLWindowSDL::setupFailure(const std::string& text, const std::string& caption, U32 type)
{
    destroyContext();

    OSMessageBox(text, caption, type);
}

BOOL LLWindowSDL::SDLReallyCaptureInput(BOOL capture)
{
    // note: this used to be safe to call nestedly, but in the
    // end that's not really a wise usage pattern, so don't.

    if (capture)
        mReallyCapturedCount = 1;
    else
        mReallyCapturedCount = 0;

    bool wantGrab;
    if (mReallyCapturedCount <= 0) // uncapture
    {
        wantGrab = false;
    } else // capture
    {
        wantGrab = true;
    }

    if (mReallyCapturedCount < 0) // yuck, imbalance.
    {
        mReallyCapturedCount = 0;
        LL_WARNS() << "ReallyCapture count was < 0" << LL_ENDL;
    }

    bool newGrab = wantGrab;

#if LL_X11
    if (!mFullscreen) /* only bother if we're windowed anyway */
    {
        if (mSDL_Display)
        {
            /* we dirtily mix raw X11 with SDL so that our pointer
               isn't (as often) constrained to the limits of the
               window while grabbed, which feels nicer and
               hopefully eliminates some reported 'sticky pointer'
               problems.  We use raw X11 instead of
               SDL_WM_GrabInput() because the latter constrains
               the pointer to the window and also steals all
               *keyboard* input from the window manager, which was
               frustrating users. */
            int result;
            if (wantGrab == true)
            {
                maybe_lock_display();
                result = XGrabPointer(mSDL_Display, mSDL_XWindowID,
                                      True, 0, GrabModeAsync,
                                      GrabModeAsync,
                                      None, None, CurrentTime);
                maybe_unlock_display();
                if (GrabSuccess == result)
                    newGrab = true;
                else
                    newGrab = false;
            }
            else
            {
                newGrab = false;

                maybe_lock_display();
                XUngrabPointer(mSDL_Display, CurrentTime);
                // Make sure the ungrab happens RIGHT NOW.
                XSync(mSDL_Display, False);
                maybe_unlock_display();
            }
        }
    }
#endif // LL_X11
    // return boolean success for whether we ended up in the desired state
    return capture == newGrab;
}

U32 LLWindowSDL::SDLCheckGrabbyKeys(U32 keysym, BOOL gain)
{
    /* part of the fix for SL-13243: Some popular window managers like
       to totally eat alt-drag for the purposes of moving windows.  We
       spoil their day by acquiring the exclusive X11 mouse lock for as
       long as ALT is held down, so the window manager can't easily
       see what's happening.  Tested successfully with Metacity.
       And... do the same with CTRL, for other darn WMs.  We don't
       care about other metakeys as SL doesn't use them with dragging
       (for now). */

    /* We maintain a bitmap of critical keys which are up and down
       instead of simply key-counting, because SDL sometimes reports
       misbalanced keyup/keydown event pairs to us for whatever reason. */

    U32 mask = 0;
    switch (keysym)
    {
        case SDLK_LALT:
            mask = 1U << 0; break;
        case SDLK_RALT:
            mask = 1U << 1; break;
        case SDLK_LCTRL:
            mask = 1U << 2; break;
        case SDLK_RCTRL:
            mask = 1U << 3; break;
        default:
            break;
    }

    if (gain)
        mGrabbyKeyFlags |= mask;
    else
        mGrabbyKeyFlags &= ~mask;

    //LL_INFOS() << "mGrabbyKeyFlags=" << mGrabbyKeyFlags << LL_ENDL;

    /* 0 means we don't need to mousegrab, otherwise grab. */
    return mGrabbyKeyFlags;
}


void check_vm_bloat()
{
#if LL_LINUX
    // watch our own VM and RSS sizes, warn if we bloated rapidly
    static const std::string STATS_FILE = "/proc/self/stat";
    FILE *fp = fopen(STATS_FILE.c_str(), "r");
    if (fp)
    {
        static long long last_vm_size = 0;
        static long long last_rss_size = 0;
        const long long significant_vm_difference = 250 * 1024*1024;
        const long long significant_rss_difference = 50 * 1024*1024;
        long long this_vm_size = 0;
        long long this_rss_size = 0;

        ssize_t res;
        size_t dummy;
        char *ptr = NULL;
        for (int i=0; i<22; ++i) // parse past the values we don't want
        {
            res = getdelim(&ptr, &dummy, ' ', fp);
            if (-1 == res)
            {
                LL_WARNS() << "Unable to parse " << STATS_FILE << LL_ENDL;
                goto finally;
            }
            free(ptr);
            ptr = NULL;
        }
        // 23rd space-delimited entry is vsize
        res = getdelim(&ptr, &dummy, ' ', fp);
        llassert(ptr);
        if (-1 == res)
        {
            LL_WARNS() << "Unable to parse " << STATS_FILE << LL_ENDL;
            goto finally;
        }
        this_vm_size = atoll(ptr);
        free(ptr);
        ptr = NULL;
        // 24th space-delimited entry is RSS
        res = getdelim(&ptr, &dummy, ' ', fp);
        llassert(ptr);
        if (-1 == res)
        {
            LL_WARNS() << "Unable to parse " << STATS_FILE << LL_ENDL;
            goto finally;
        }
        this_rss_size = getpagesize() * atoll(ptr);
        free(ptr);
        ptr = NULL;

        LL_INFOS() << "VM SIZE IS NOW " << (this_vm_size/(1024*1024)) << " MB, RSS SIZE IS NOW " << (this_rss_size/(1024*1024)) << " MB" << LL_ENDL;

        if (llabs(last_vm_size - this_vm_size) >
            significant_vm_difference)
        {
            if (this_vm_size > last_vm_size)
            {
                LL_WARNS() << "VM size grew by " << (this_vm_size - last_vm_size)/(1024*1024) << " MB in last frame" << LL_ENDL;
            }
            else
            {
                LL_INFOS() << "VM size shrank by " << (last_vm_size - this_vm_size)/(1024*1024) << " MB in last frame" << LL_ENDL;
            }
        }

        if (llabs(last_rss_size - this_rss_size) >
            significant_rss_difference)
        {
            if (this_rss_size > last_rss_size)
            {
                LL_WARNS() << "RSS size grew by " << (this_rss_size - last_rss_size)/(1024*1024) << " MB in last frame" << LL_ENDL;
            }
            else
            {
                LL_INFOS() << "RSS size shrank by " << (last_rss_size - this_rss_size)/(1024*1024) << " MB in last frame" << LL_ENDL;
            }
        }

        last_rss_size = this_rss_size;
        last_vm_size = this_vm_size;

        finally:
        if (NULL != ptr)
        {
            free(ptr);
            ptr = NULL;
        }
        fclose(fp);
    }
#endif // LL_LINUX
}


// virtual
void LLWindowSDL::processMiscNativeEvents()
{
#if LL_GLIB
    // Pump until we've nothing left to do or passed 1/15th of a
    // second pumping for this frame.
    static LLTimer pump_timer;
    pump_timer.reset();
    pump_timer.setTimerExpirySec(1.0f / 15.0f);
    do
    {
        g_main_context_iteration(g_main_context_default(), FALSE);
    } while( g_main_context_pending(g_main_context_default()) && !pump_timer.hasExpired());
#endif

    // hack - doesn't belong here - but this is just for debugging
    if (getenv("LL_DEBUG_BLOAT"))
    {
        check_vm_bloat();
    }
}

void LLWindowSDL::gatherInput()
{
    const Uint32 CLICK_THRESHOLD = 300;  // milliseconds
    static int leftClick = 0;
    static int rightClick = 0;
    static Uint32 lastLeftDown = 0;
    static Uint32 lastRightDown = 0;
    SDL_Event event;

    // Handle all outstanding SDL events
    while (SDL_PollEvent(&event))
    {
        switch (event.type)
        {
            case SDL_MOUSEWHEEL:
                if( event.wheel.y != 0 )
                    mCallbacks->handleScrollWheel(this, -event.wheel.y);
                break;

            case SDL_MOUSEMOTION:
            {
                LLCoordWindow winCoord(event.button.x, event.button.y);
                LLCoordGL openGlCoord;
                convertCoords(winCoord, &openGlCoord);
                MASK mask = gKeyboard->currentMask(TRUE);
                mCallbacks->handleMouseMove(this, openGlCoord, mask);
                break;
            }

            case SDL_TEXTINPUT:
            {
                auto string = utf8str_to_utf16str( event.text.text );
                mKeyModifiers = gKeyboard->currentMask( FALSE );
                mInputType = "textinput";
                for( auto key: string )
                {
                    mKeyVirtualKey = key;

                    if( (MASK_CONTROL|MASK_ALT)&mKeyModifiers )
                        gKeyboard->handleKeyDown(mKeyVirtualKey, mKeyModifiers );
                    else
                        handleUnicodeUTF16( key, mKeyModifiers );
                }
                break;
            }

            case SDL_KEYDOWN:
                mKeyVirtualKey = event.key.keysym.sym;
                mKeyModifiers = event.key.keysym.mod;
                mInputType = "keydown";

                // treat all possible Enter/Return keys the same
                if (mKeyVirtualKey == SDLK_RETURN2 || mKeyVirtualKey == SDLK_KP_ENTER)
                {
                    mKeyVirtualKey = SDLK_RETURN;
                }

                gKeyboard->handleKeyDown(mKeyVirtualKey, mKeyModifiers );

                // <FS:ND> Slightly hacky :| To make the viewer honor enter (eg to accept form input) we've to not only send handleKeyDown but also send a
                // invoke handleUnicodeUTF16 in case the user hits return.
                // Note that we cannot blindly use handleUnicodeUTF16 for each SDL_KEYDOWN. Doing so will create bogus keyboard input (like % for cursor left).
                if( mKeyVirtualKey == SDLK_RETURN )
                {
                    // fix return key not working when capslock, scrolllock or numlock are enabled
                    mKeyModifiers &= (~(KMOD_NUM | KMOD_CAPS | KMOD_MODE | KMOD_SCROLL));
                    handleUnicodeUTF16( mKeyVirtualKey, mKeyModifiers );
                }

                // part of the fix for SL-13243
                if (SDLCheckGrabbyKeys(event.key.keysym.sym, TRUE) != 0)
                    SDLReallyCaptureInput(TRUE);

                break;

            case SDL_KEYUP:
                mKeyVirtualKey = event.key.keysym.sym;
                mKeyModifiers = event.key.keysym.mod;
                mInputType = "keyup";

                // treat all possible Enter/Return keys the same
                if (mKeyVirtualKey == SDLK_RETURN2 || mKeyVirtualKey == SDLK_KP_ENTER)
                {
                    mKeyVirtualKey = SDLK_RETURN;
                }

                if (SDLCheckGrabbyKeys(mKeyVirtualKey, FALSE) == 0)
                    SDLReallyCaptureInput(FALSE); // part of the fix for SL-13243

                gKeyboard->handleKeyUp(mKeyVirtualKey,mKeyModifiers);
                break;

            case SDL_MOUSEBUTTONDOWN:
            {
                bool isDoubleClick = false;
                LLCoordWindow winCoord(event.button.x, event.button.y);
                LLCoordGL openGlCoord;
                convertCoords(winCoord, &openGlCoord);
                MASK mask = gKeyboard->currentMask(TRUE);

                if (event.button.button == SDL_BUTTON_LEFT)   // SDL doesn't manage double clicking...
                {
                    Uint32 now = SDL_GetTicks();
                    if ((now - lastLeftDown) > CLICK_THRESHOLD)
                        leftClick = 1;
                    else
                    {
                        if (++leftClick >= 2)
                        {
                            leftClick = 0;
                            isDoubleClick = true;
                        }
                    }
                    lastLeftDown = now;
                }
                else if (event.button.button == SDL_BUTTON_RIGHT)
                {
                    Uint32 now = SDL_GetTicks();
                    if ((now - lastRightDown) > CLICK_THRESHOLD)
                        rightClick = 1;
                    else
                    {
                        if (++rightClick >= 2)
                        {
                            rightClick = 0;
                            isDoubleClick = true;
                        }
                    }
                    lastRightDown = now;
                }

                if (event.button.button == SDL_BUTTON_LEFT)  // left
                {
                    if (isDoubleClick)
                        mCallbacks->handleDoubleClick(this, openGlCoord, mask);
                    else
                        mCallbacks->handleMouseDown(this, openGlCoord, mask);
                }

                else if (event.button.button == SDL_BUTTON_RIGHT)  // right
                {
                    mCallbacks->handleRightMouseDown(this, openGlCoord, mask);
                }

                else if (event.button.button == SDL_BUTTON_MIDDLE)  // middle
                {
                    mCallbacks->handleMiddleMouseDown(this, openGlCoord, mask);
                }
                else if (event.button.button == 4)  // mousewheel up...thanks to X11 for making SDL consider these "buttons".
                    mCallbacks->handleScrollWheel(this, -1);
                else if (event.button.button == 5)  // mousewheel down...thanks to X11 for making SDL consider these "buttons".
                    mCallbacks->handleScrollWheel(this, 1);

                break;
            }

            case SDL_MOUSEBUTTONUP:
            {
                LLCoordWindow winCoord(event.button.x, event.button.y);
                LLCoordGL openGlCoord;
                convertCoords(winCoord, &openGlCoord);
                MASK mask = gKeyboard->currentMask(TRUE);

                if (event.button.button == SDL_BUTTON_LEFT)  // left
                    mCallbacks->handleMouseUp(this, openGlCoord, mask);
                else if (event.button.button == SDL_BUTTON_RIGHT)  // right
                    mCallbacks->handleRightMouseUp(this, openGlCoord, mask);
                else if (event.button.button == SDL_BUTTON_MIDDLE)  // middle
                    mCallbacks->handleMiddleMouseUp(this, openGlCoord, mask);
                // don't handle mousewheel here...

                break;
            }

            case SDL_WINDOWEVENT:  // *FIX: handle this?
            {
                if( event.window.event == SDL_WINDOWEVENT_RESIZED
                    /* || event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED*/ ) // <FS:ND> SDL_WINDOWEVENT_SIZE_CHANGED is followed by SDL_WINDOWEVENT_RESIZED, so handling one shall be enough
                {
                    LL_INFOS() << "Handling a resize event: " << event.window.data1 << "x" << event.window.data2 << LL_ENDL;

                    S32 width = llmax(event.window.data1, (S32)mMinWindowWidth);
                    S32 height = llmax(event.window.data2, (S32)mMinWindowHeight);
                    mSurface = SDL_GetWindowSurface( mWindow );

                    // *FIX: I'm not sure this is necessary!
                    // <FS:ND> I think is is not
                    // SDL_SetWindowSize(mWindow, width, height);
                    //

                    mCallbacks->handleResize(this, width, height);
                }
                else if( event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED ) // <FS:ND> What about SDL_WINDOWEVENT_ENTER (mouse focus)
                {
                    // We have to do our own state massaging because SDL
                    // can send us two unfocus events in a row for example,
                    // which confuses the focus code [SL-24071].
                    mHaveInputFocus = true;

                    mCallbacks->handleFocus(this);
                }
                else if( event.window.event == SDL_WINDOWEVENT_FOCUS_LOST ) // <FS:ND> What about SDL_WINDOWEVENT_LEAVE (mouse focus)
                {
                    // We have to do our own state massaging because SDL
                    // can send us two unfocus events in a row for example,
                    // which confuses the focus code [SL-24071].
                    mHaveInputFocus = false;

                    mCallbacks->handleFocusLost(this);
                }
                else if( event.window.event == SDL_WINDOWEVENT_MINIMIZED ||
                         event.window.event == SDL_WINDOWEVENT_MAXIMIZED ||
                         event.window.event == SDL_WINDOWEVENT_RESTORED ||
                         event.window.event == SDL_WINDOWEVENT_EXPOSED ||
                         event.window.event == SDL_WINDOWEVENT_SHOWN )
                {
                    mIsMinimized = (event.window.event == SDL_WINDOWEVENT_MINIMIZED);

                    mCallbacks->handleActivate(this, !mIsMinimized);
                    LL_INFOS() << "SDL deiconification state switched to " << mIsMinimized << LL_ENDL;
                }

                break;
            }
            case SDL_QUIT:
                if(mCallbacks->handleCloseRequest(this))
                {
                    // Get the app to initiate cleanup.
                    mCallbacks->handleQuit(this);
                    // The app is responsible for calling destroyWindow when done with GL
                }
                break;
            default:
                //LL_INFOS() << "Unhandled SDL event type " << event.type << LL_ENDL;
                break;
        }
    }

    updateCursor();

#if LL_X11
    // This is a good time to stop flashing the icon if our mFlashTimer has
    // expired.
    if (mFlashing && mFlashTimer.hasExpired())
    {
        x11_set_urgent(FALSE);
        mFlashing = FALSE;
    }
#endif // LL_X11
}

static SDL_Cursor *makeSDLCursorFromBMP(const char *filename, int hotx, int hoty)
{
    SDL_Cursor *sdlcursor = NULL;
    SDL_Surface *bmpsurface;

    // Load cursor pixel data from BMP file
    bmpsurface = Load_BMP_Resource(filename);
    if (bmpsurface && bmpsurface->w%8==0)
    {
        SDL_Surface *cursurface;
        LL_DEBUGS() << "Loaded cursor file " << filename << " "
                    << bmpsurface->w << "x" << bmpsurface->h << LL_ENDL;
        cursurface = SDL_CreateRGBSurface (SDL_SWSURFACE,
                                           bmpsurface->w,
                                           bmpsurface->h,
                                           32,
                                           SDL_SwapLE32(0xFFU),
                                           SDL_SwapLE32(0xFF00U),
                                           SDL_SwapLE32(0xFF0000U),
                                           SDL_SwapLE32(0xFF000000U));
        SDL_FillRect(cursurface, NULL, SDL_SwapLE32(0x00000000U));

        // Blit the cursor pixel data onto a 32-bit RGBA surface so we
        // only have to cope with processing one type of pixel format.
        if (0 == SDL_BlitSurface(bmpsurface, NULL,
                                 cursurface, NULL))
        {
            // n.b. we already checked that width is a multiple of 8.
            const int bitmap_bytes = (cursurface->w * cursurface->h) / 8;
            unsigned char *cursor_data = new unsigned char[bitmap_bytes];
            unsigned char *cursor_mask = new unsigned char[bitmap_bytes];
            memset(cursor_data, 0, bitmap_bytes);
            memset(cursor_mask, 0, bitmap_bytes);
            int i,j;
            // Walk the RGBA cursor pixel data, extracting both data and
            // mask to build SDL-friendly cursor bitmaps from.  The mask
            // is inferred by color-keying against 200,200,200
            for (i=0; i<cursurface->h; ++i) {
                for (j=0; j<cursurface->w; ++j) {
                    U8 *pixelp =
                            ((U8*)cursurface->pixels)
                            + cursurface->pitch * i
                            + j*cursurface->format->BytesPerPixel;
                    U8 srcred = pixelp[0];
                    U8 srcgreen = pixelp[1];
                    U8 srcblue = pixelp[2];
                    BOOL mask_bit = (srcred != 200)
                                    || (srcgreen != 200)
                                    || (srcblue != 200);
                    BOOL data_bit = mask_bit && (srcgreen <= 80);//not 0x80
                    unsigned char bit_offset = (cursurface->w/8) * i
                                               + j/8;
                    cursor_data[bit_offset] |= (data_bit) << (7 - (j&7));
                    cursor_mask[bit_offset] |= (mask_bit) << (7 - (j&7));
                }
            }
            sdlcursor = SDL_CreateCursor((Uint8*)cursor_data,
                                         (Uint8*)cursor_mask,
                                         cursurface->w, cursurface->h,
                                         hotx, hoty);
            delete[] cursor_data;
            delete[] cursor_mask;
        } else {
            LL_WARNS() << "CURSOR BLIT FAILURE, cursurface: " << cursurface << LL_ENDL;
        }
        SDL_FreeSurface(cursurface);
        SDL_FreeSurface(bmpsurface);
    } else {
        LL_WARNS() << "CURSOR LOAD FAILURE " << filename << LL_ENDL;
    }

    return sdlcursor;
}

void LLWindowSDL::updateCursor()
{
    if (ATIbug) {
        // cursor-updating is very flaky when this bug is
        // present; do nothing.
        return;
    }

    if (mCurrentCursor != mNextCursor)
    {
        if (mNextCursor < UI_CURSOR_COUNT)
        {
            SDL_Cursor *sdlcursor = mSDLCursors[mNextCursor];
            // Try to default to the arrow for any cursors that
            // did not load correctly.
            if (!sdlcursor && mSDLCursors[UI_CURSOR_ARROW])
                sdlcursor = mSDLCursors[UI_CURSOR_ARROW];
            if (sdlcursor)
                SDL_SetCursor(sdlcursor);
        } else {
            LL_WARNS() << "Tried to set invalid cursor number " << mNextCursor << LL_ENDL;
        }
        mCurrentCursor = mNextCursor;
    }
}

void LLWindowSDL::initCursors()
{
    int i;
    // Blank the cursor pointer array for those we may miss.
    for (i=0; i<UI_CURSOR_COUNT; ++i)
    {
        mSDLCursors[i] = NULL;
    }
    // Pre-make an SDL cursor for each of the known cursor types.
    // We hardcode the hotspots - to avoid that we'd have to write
    // a .cur file loader.
    // NOTE: SDL doesn't load RLE-compressed BMP files.
    mSDLCursors[UI_CURSOR_ARROW] = makeSDLCursorFromBMP("llarrow.BMP",0,0);
    mSDLCursors[UI_CURSOR_WAIT] = makeSDLCursorFromBMP("wait.BMP",12,15);
    mSDLCursors[UI_CURSOR_HAND] = makeSDLCursorFromBMP("hand.BMP",7,10);
    mSDLCursors[UI_CURSOR_IBEAM] = makeSDLCursorFromBMP("ibeam.BMP",15,16);
    mSDLCursors[UI_CURSOR_CROSS] = makeSDLCursorFromBMP("cross.BMP",16,14);
    mSDLCursors[UI_CURSOR_SIZENWSE] = makeSDLCursorFromBMP("sizenwse.BMP",14,17);
    mSDLCursors[UI_CURSOR_SIZENESW] = makeSDLCursorFromBMP("sizenesw.BMP",17,17);
    mSDLCursors[UI_CURSOR_SIZEWE] = makeSDLCursorFromBMP("sizewe.BMP",16,14);
    mSDLCursors[UI_CURSOR_SIZENS] = makeSDLCursorFromBMP("sizens.BMP",17,16);
    mSDLCursors[UI_CURSOR_SIZEALL] = makeSDLCursorFromBMP("sizeall.BMP", 17, 17);
    mSDLCursors[UI_CURSOR_NO] = makeSDLCursorFromBMP("llno.BMP",8,8);
    mSDLCursors[UI_CURSOR_WORKING] = makeSDLCursorFromBMP("working.BMP",12,15);
    mSDLCursors[UI_CURSOR_TOOLGRAB] = makeSDLCursorFromBMP("lltoolgrab.BMP",2,13);
    mSDLCursors[UI_CURSOR_TOOLLAND] = makeSDLCursorFromBMP("lltoolland.BMP",1,6);
    mSDLCursors[UI_CURSOR_TOOLFOCUS] = makeSDLCursorFromBMP("lltoolfocus.BMP",8,5);
    mSDLCursors[UI_CURSOR_TOOLCREATE] = makeSDLCursorFromBMP("lltoolcreate.BMP",7,7);
    mSDLCursors[UI_CURSOR_ARROWDRAG] = makeSDLCursorFromBMP("arrowdrag.BMP",0,0);
    mSDLCursors[UI_CURSOR_ARROWCOPY] = makeSDLCursorFromBMP("arrowcop.BMP",0,0);
    mSDLCursors[UI_CURSOR_ARROWDRAGMULTI] = makeSDLCursorFromBMP("llarrowdragmulti.BMP",0,0);
    mSDLCursors[UI_CURSOR_ARROWCOPYMULTI] = makeSDLCursorFromBMP("arrowcopmulti.BMP",0,0);
    mSDLCursors[UI_CURSOR_NOLOCKED] = makeSDLCursorFromBMP("llnolocked.BMP",8,8);
    mSDLCursors[UI_CURSOR_ARROWLOCKED] = makeSDLCursorFromBMP("llarrowlocked.BMP",0,0);
    mSDLCursors[UI_CURSOR_GRABLOCKED] = makeSDLCursorFromBMP("llgrablocked.BMP",2,13);
    mSDLCursors[UI_CURSOR_TOOLTRANSLATE] = makeSDLCursorFromBMP("lltooltranslate.BMP",0,0);
    mSDLCursors[UI_CURSOR_TOOLROTATE] = makeSDLCursorFromBMP("lltoolrotate.BMP",0,0);
    mSDLCursors[UI_CURSOR_TOOLSCALE] = makeSDLCursorFromBMP("lltoolscale.BMP",0,0);
    mSDLCursors[UI_CURSOR_TOOLCAMERA] = makeSDLCursorFromBMP("lltoolcamera.BMP",7,5);
    mSDLCursors[UI_CURSOR_TOOLPAN] = makeSDLCursorFromBMP("lltoolpan.BMP",7,5);
    mSDLCursors[UI_CURSOR_TOOLZOOMIN] = makeSDLCursorFromBMP("lltoolzoomin.BMP",7,5);
    mSDLCursors[UI_CURSOR_TOOLZOOMOUT] = makeSDLCursorFromBMP("lltoolzoomout.BMP", 7, 5);
    mSDLCursors[UI_CURSOR_TOOLPICKOBJECT3] = makeSDLCursorFromBMP("toolpickobject3.BMP",0,0);
    mSDLCursors[UI_CURSOR_TOOLPLAY] = makeSDLCursorFromBMP("toolplay.BMP",0,0);
    mSDLCursors[UI_CURSOR_TOOLPAUSE] = makeSDLCursorFromBMP("toolpause.BMP",0,0);
    mSDLCursors[UI_CURSOR_TOOLMEDIAOPEN] = makeSDLCursorFromBMP("toolmediaopen.BMP",0,0);
    mSDLCursors[UI_CURSOR_PIPETTE] = makeSDLCursorFromBMP("lltoolpipette.BMP",2,28);
    mSDLCursors[UI_CURSOR_TOOLSIT] = makeSDLCursorFromBMP("toolsit.BMP",20,15);
    mSDLCursors[UI_CURSOR_TOOLBUY] = makeSDLCursorFromBMP("toolbuy.BMP",20,15);
    mSDLCursors[UI_CURSOR_TOOLOPEN] = makeSDLCursorFromBMP("toolopen.BMP",20,15);
    mSDLCursors[UI_CURSOR_TOOLPATHFINDING] = makeSDLCursorFromBMP("lltoolpathfinding.BMP", 16, 16);
    mSDLCursors[UI_CURSOR_TOOLPATHFINDING_PATH_START] = makeSDLCursorFromBMP("lltoolpathfindingpathstart.BMP", 16, 16);
    mSDLCursors[UI_CURSOR_TOOLPATHFINDING_PATH_START_ADD] = makeSDLCursorFromBMP("lltoolpathfindingpathstartadd.BMP", 16, 16);
    mSDLCursors[UI_CURSOR_TOOLPATHFINDING_PATH_END] = makeSDLCursorFromBMP("lltoolpathfindingpathend.BMP", 16, 16);
    mSDLCursors[UI_CURSOR_TOOLPATHFINDING_PATH_END_ADD] = makeSDLCursorFromBMP("lltoolpathfindingpathendadd.BMP", 16, 16);
    mSDLCursors[UI_CURSOR_TOOLNO] = makeSDLCursorFromBMP("llno.BMP",8,8);

    if (getenv("LL_ATI_MOUSE_CURSOR_BUG") != NULL) {
        LL_INFOS() << "Disabling cursor updating due to LL_ATI_MOUSE_CURSOR_BUG" << LL_ENDL;
        ATIbug = true;
    }
}

void LLWindowSDL::quitCursors()
{
    int i;
    if (mWindow)
    {
        for (i=0; i<UI_CURSOR_COUNT; ++i)
        {
            if (mSDLCursors[i])
            {
                SDL_FreeCursor(mSDLCursors[i]);
                mSDLCursors[i] = NULL;
            }
        }
    } else {
        // SDL doesn't refcount cursors, so if the window has
        // already been destroyed then the cursors have gone with it.
        LL_INFOS() << "Skipping quitCursors: mWindow already gone." << LL_ENDL;
        for (i=0; i<UI_CURSOR_COUNT; ++i)
            mSDLCursors[i] = NULL;
    }
}

void LLWindowSDL::captureMouse()
{
    // SDL already enforces the semantics that captureMouse is
    // used for, i.e. that we continue to get mouse events as long
    // as a button is down regardless of whether we left the
    // window, and in a less obnoxious way than SDL_WM_GrabInput
    // which would confine the cursor to the window too.

    LL_DEBUGS() << "LLWindowSDL::captureMouse" << LL_ENDL;
}

void LLWindowSDL::releaseMouse()
{
    // see LWindowSDL::captureMouse()

    LL_DEBUGS() << "LLWindowSDL::releaseMouse" << LL_ENDL;
}

void LLWindowSDL::hideCursor()
{
    if(!mCursorHidden)
    {
        // LL_INFOS() << "hideCursor: hiding" << LL_ENDL;
        mCursorHidden = TRUE;
        mHideCursorPermanent = TRUE;
        SDL_ShowCursor(0);
    }
    else
    {
        // LL_INFOS() << "hideCursor: already hidden" << LL_ENDL;
    }
}

void LLWindowSDL::showCursor()
{
    if(mCursorHidden)
    {
        // LL_INFOS() << "showCursor: showing" << LL_ENDL;
        mCursorHidden = FALSE;
        mHideCursorPermanent = FALSE;
        SDL_ShowCursor(1);
    }
    else
    {
        // LL_INFOS() << "showCursor: already visible" << LL_ENDL;
    }
}

void LLWindowSDL::showCursorFromMouseMove()
{
    if (!mHideCursorPermanent)
    {
        showCursor();
    }
}

void LLWindowSDL::hideCursorUntilMouseMove()
{
    if (!mHideCursorPermanent)
    {
        hideCursor();
        mHideCursorPermanent = FALSE;
    }
}

//
// LLSplashScreenSDL - I don't think we'll bother to implement this; it's
// fairly obsolete at this point.
//
LLSplashScreenSDL::LLSplashScreenSDL()
{
}

LLSplashScreenSDL::~LLSplashScreenSDL()
{
}

void LLSplashScreenSDL::showImpl()
{
}

void LLSplashScreenSDL::updateImpl(const std::string& mesg)
{
}

void LLSplashScreenSDL::hideImpl()
{
}

S32 OSMessageBoxSDL(const std::string& text, const std::string& caption, U32 type)
{
    SDL_MessageBoxData oData = { SDL_MESSAGEBOX_INFORMATION, nullptr, caption.c_str(), text.c_str(), 0, nullptr, nullptr };
    SDL_MessageBoxButtonData btnOk[] = {{SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT, OSBTN_OK, "OK" }};
    SDL_MessageBoxButtonData btnOkCancel [] =  {{SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT, OSBTN_OK, "OK" }, {SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT, OSBTN_CANCEL, "Cancel"} };
    SDL_MessageBoxButtonData btnYesNo[] = { {SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT, OSBTN_YES, "Yes" }, {SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT, OSBTN_NO, "No"} };

    switch (type)
    {
        default:
        case OSMB_OK:
            oData.flags = SDL_MESSAGEBOX_WARNING;
            oData.buttons = btnOk;
            oData.numbuttons = 1;
            break;
        case OSMB_OKCANCEL:
            oData.flags = SDL_MESSAGEBOX_INFORMATION;
            oData.buttons = btnOkCancel;
            oData.numbuttons = 2;
            break;
        case OSMB_YESNO:
            oData.flags = SDL_MESSAGEBOX_INFORMATION;
            oData.buttons = btnYesNo;
            oData.numbuttons = 2;
            break;
    }

    int btn{0};
    if( 0 == SDL_ShowMessageBox( &oData, &btn ) )
        return btn;
    return OSBTN_CANCEL;
}

BOOL LLWindowSDL::dialogColorPicker( F32 *r, F32 *g, F32 *b)
{
    return (FALSE);
}

/*
        Make the raw keyboard data available - used to poke through to LLQtWebKit so
        that Qt/Webkit has access to the virtual keycodes etc. that it needs
*/
LLSD LLWindowSDL::getNativeKeyData()
{
    LLSD result = LLSD::emptyMap();

    U32 modifiers = 0; // pretend-native modifiers... oh what a tangled web we weave!

    // we go through so many levels of device abstraction that I can't really guess
    // what a plugin under GDK under Qt under SL under SDL under X11 considers
    // a 'native' modifier mask.  this has been sort of reverse-engineered... they *appear*
    // to match GDK consts, but that may be co-incidence.
    modifiers |= (mKeyModifiers & KMOD_LSHIFT) ? 0x0001 : 0;
    modifiers |= (mKeyModifiers & KMOD_RSHIFT) ? 0x0001 : 0;// munge these into the same shift
    modifiers |= (mKeyModifiers & KMOD_CAPS)   ? 0x0002 : 0;
    modifiers |= (mKeyModifiers & KMOD_LCTRL)  ? 0x0004 : 0;
    modifiers |= (mKeyModifiers & KMOD_RCTRL)  ? 0x0004 : 0;// munge these into the same ctrl
    modifiers |= (mKeyModifiers & KMOD_LALT)   ? 0x0008 : 0;// untested
    modifiers |= (mKeyModifiers & KMOD_RALT)   ? 0x0008 : 0;// untested
    // *todo: test ALTs - I don't have a case for testing these.  Do you?
    // *todo: NUM? - I don't care enough right now (and it's not a GDK modifier).

    result["virtual_key"] = (S32)mKeyVirtualKey;
    result["virtual_key_win"] = (S32)LLKeyboardSDL::mapSDL2toWin( mKeyVirtualKey );
    result["modifiers"] = (S32)modifiers;
    result["input_type"] = mInputType;
    return result;
}

#if LL_LINUX || LL_SOLARIS
// extracted from spawnWebBrowser for clarity and to eliminate
//  compiler confusion regarding close(int fd) vs. LLWindow::close()
void exec_cmd(const std::string& cmd, const std::string& arg)
{
    char* const argv[] = {(char*)cmd.c_str(), (char*)arg.c_str(), NULL};
    fflush(NULL);
    pid_t pid = fork();
    if (pid == 0)
    { // child
        // disconnect from stdin/stdout/stderr, or child will
        // keep our output pipe undesirably alive if it outlives us.
        // close(0);
        // close(1);
        // close(2);
        // <FS:TS> Reopen stdin, stdout, and stderr to /dev/null.
        //         It's good practice to always have those file
        //         descriptors open to something, lest the exec'd
        //         program actually try to use them.
        FILE *result;
        result = freopen("/dev/null","r",stdin);
        if (result == NULL)
        {
            LL_WARNS() << "Error reopening stdin for web browser: "
                       << strerror(errno) << LL_ENDL;
        }
        result = freopen("/dev/null","w",stdout);
        if (result == NULL)
        {
            LL_WARNS() << "Error reopening stdout for web browser: "
                       << strerror(errno) << LL_ENDL;
        }
        result = freopen("/dev/null","w",stderr);
        if (result == NULL)
        {
            LL_WARNS() << "Error reopening stderr for web browser: "
                       << strerror(errno) << LL_ENDL;
        }
        // end ourself by running the command
        execv(cmd.c_str(), argv);   /* Flawfinder: ignore */
        // if execv returns at all, there was a problem.
        LL_WARNS() << "execv failure when trying to start " << cmd << LL_ENDL;
        _exit(1); // _exit because we don't want atexit() clean-up!
    } else {
        if (pid > 0)
        {
            // parent - wait for child to die
            int childExitStatus;
            waitpid(pid, &childExitStatus, 0);
        } else {
            LL_WARNS() << "fork failure." << LL_ENDL;
        }
    }
}
#endif

// Open a URL with the user's default web browser.
// Must begin with protocol identifier.
void LLWindowSDL::spawnWebBrowser(const std::string& escaped_url, bool async)
{
    bool found = false;
    S32 i;
    for (i = 0; i < gURLProtocolWhitelistCount; i++)
    {
        if (escaped_url.find(gURLProtocolWhitelist[i]) != std::string::npos)
        {
            found = true;
            break;
        }
    }

    if (!found)
    {
        LL_WARNS() << "spawn_web_browser called for url with protocol not on whitelist: " << escaped_url << LL_ENDL;
        return;
    }

    LL_INFOS() << "spawn_web_browser: " << escaped_url << LL_ENDL;

#if LL_LINUX
# if LL_X11
    if (mSDL_Display)
    {
        maybe_lock_display();
        // Just in case - before forking.
        XSync(mSDL_Display, False);
        maybe_unlock_display();
    }
# endif // LL_X11

    std::string cmd, arg;
    cmd  = gDirUtilp->getAppRODataDir();
    cmd += gDirUtilp->getDirDelimiter();
    cmd += "etc";
    cmd += gDirUtilp->getDirDelimiter();
    cmd += "launch_url.sh";
    arg = escaped_url;
    exec_cmd(cmd, arg);
#endif // LL_LINUX

    LL_INFOS() << "spawn_web_browser returning." << LL_ENDL;
}

void LLWindowSDL::openFile(const std::string& file_name)
{
    spawnWebBrowser("file://"+file_name,TRUE);
}

void *LLWindowSDL::getPlatformWindow()
{
    return NULL;
}

void LLWindowSDL::bringToFront()
{
    // This is currently used when we are 'launched' to a specific
    // map position externally.
    LL_INFOS() << "bringToFront" << LL_ENDL;
#if LL_X11
    if (mSDL_Display && !mFullscreen)
    {
        maybe_lock_display();
        XRaiseWindow(mSDL_Display, mSDL_XWindowID);
        XSync(mSDL_Display, False);
        maybe_unlock_display();
    }
#endif // LL_X11
}

//static
std::vector<std::string> LLWindowSDL::getDynamicFallbackFontList()
{
    // Use libfontconfig to find us a nice ordered list of fallback fonts
    // specific to this system.
    std::string final_fallback("/usr/share/fonts/truetype/kochi/kochi-gothic.ttf");
    const int max_font_count_cutoff = 40; // fonts are expensive in the current system, don't enumerate an arbitrary number of them
    // Our 'ideal' font properties which define the sorting results.
    // slant=0 means Roman, index=0 means the first face in a font file
    // (the one we actually use), weight=80 means medium weight,
    // spacing=0 means proportional spacing.
    std::string sort_order("slant=0:index=0:weight=80:spacing=0");
    // elide_unicode_coverage removes fonts from the list whose unicode
    // range is covered by fonts earlier in the list.  This usually
    // removes ~90% of the fonts as redundant (which is great because
    // the font list can be huge), but might unnecessarily reduce the
    // renderable range if for some reason our FreeType actually fails
    // to use some of the fonts we want it to.
    const bool elide_unicode_coverage = true;
    std::vector<std::string> rtns;
    FcFontSet *fs = NULL;
    FcPattern *sortpat = NULL;

    LL_INFOS() << "Getting system font list from FontConfig..." << LL_ENDL;

    // If the user has a system-wide language preference, then favor
    // fonts from that language group.  This doesn't affect the types
    // of languages that can be displayed, but ensures that their
    // preferred language is rendered from a single consistent font where
    // possible.
    FL_Locale *locale = NULL;
    FL_Success success = FL_FindLocale(&locale, FL_MESSAGES);
    if (success != 0)
    {
        if (success >= 2 && locale->lang) // confident!
        {
            LL_INFOS("AppInit") << "Language " << locale->lang << LL_ENDL;
            LL_INFOS("AppInit") << "Location " << locale->country << LL_ENDL;
            LL_INFOS("AppInit") << "Variant " << locale->variant << LL_ENDL;

            LL_INFOS() << "Preferring fonts of language: "
                       << locale->lang
                       << LL_ENDL;
            sort_order = "lang=" + std::string(locale->lang) + ":"
                         + sort_order;
        }
    }
    FL_FreeLocale(&locale);

    if (!FcInit())
    {
        LL_WARNS() << "FontConfig failed to initialize." << LL_ENDL;
        rtns.push_back(final_fallback);
        return rtns;
    }

    sortpat = FcNameParse((FcChar8*) sort_order.c_str());
    if (sortpat)
    {
        // Sort the list of system fonts from most-to-least-desirable.
        FcResult result;
        fs = FcFontSort(NULL, sortpat, elide_unicode_coverage,
                        NULL, &result);
        FcPatternDestroy(sortpat);
    }

    int found_font_count = 0;
    if (fs)
    {
        // Get the full pathnames to the fonts, where available,
        // which is what we really want.
        found_font_count = fs->nfont;
        for (int i=0; i<fs->nfont; ++i)
        {
            FcChar8 *filename;
            if (FcResultMatch == FcPatternGetString(fs->fonts[i],
                                                    FC_FILE, 0,
                                                    &filename)
                && filename)
            {
                rtns.push_back(std::string((const char*)filename));
                if (rtns.size() >= max_font_count_cutoff)
                    break; // hit limit
            }
        }
        FcFontSetDestroy (fs);
    }

    LL_DEBUGS() << "Using font list: " << LL_ENDL;
    for (std::vector<std::string>::iterator it = rtns.begin();
         it != rtns.end();
         ++it)
    {
        LL_DEBUGS() << "  file: " << *it << LL_ENDL;
    }
    LL_INFOS() << "Using " << rtns.size() << "/" << found_font_count << " system fonts." << LL_ENDL;

    rtns.push_back(final_fallback);
    return rtns;
}


void* LLWindowSDL::createSharedContext()
{
    auto *pContext = SDL_GL_CreateContext(mWindow);
    if ( pContext)
    {
        SDL_GL_SetSwapInterval(0);
        SDL_GL_MakeCurrent(mWindow, mContext);

        LLCoordScreen size;
        if (getSize(&size))
            setSize(size);

        LL_DEBUGS() << "Creating shared OpenGL context successful!" << LL_ENDL;

        return (void*)pContext;
    }

    LL_WARNS() << "Creating shared OpenGL context failed!" << LL_ENDL;

    return nullptr;
}

void LLWindowSDL::makeContextCurrent(void* contextPtr)
{
    LL_PROFILER_GPU_CONTEXT;
    SDL_GL_MakeCurrent( mWindow, contextPtr );
}

void LLWindowSDL::destroySharedContext(void* contextPtr)
{
    SDL_GL_DeleteContext( contextPtr );
}

void LLWindowSDL::toggleVSync(bool enable_vsync)
{
}

U32 LLWindowSDL::getAvailableVRAMMegabytes()
{
    return 4096;
}

void LLWindowSDL::setLanguageTextInput(const LLCoordGL& position)
{
    LLCoordWindow win_pos;
    convertCoords( position, &win_pos );

    SDL_Rect r;
    r.x = win_pos.mX;
    r.y = win_pos.mY;
    r.w = 500;
    r.h = 16;

    SDL_SetTextInputRect(&r);
}