/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    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; either

    version 2.1 of the License, or (at your option) any later version.

    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 St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/*

	GEM video driver

	Patrice Mandin

	and work from

	Olivier Landemarre, Johan Klockars, Xavier Joubert, Claude Attard

*/

/* Mint includes */

#include <gem.h>

#include <gemx.h>

#include <mint/osbind.h>

#include <mint/cookie.h>

#include "SDL_endian.h"

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "../SDL_sysvideo.h"

#include "../SDL_pixels_c.h"

#include "../../events/SDL_events_c.h"

#include "../SDL_cursor_c.h"

#include "../ataricommon/SDL_ataric2p_s.h"

#include "../ataricommon/SDL_atarieddi_s.h"

#include "../ataricommon/SDL_atarimxalloc_c.h"

#include "../ataricommon/SDL_atarigl_c.h"

#include "SDL_gemvideo.h"

#include "SDL_gemevents_c.h"

#include "SDL_gemmouse_c.h"

#include "SDL_gemwm_c.h"

#include "../ataricommon/SDL_xbiosevents_c.h"

#include "../ataricommon/SDL_ataridevmouse_c.h"

/* Defines */

/*#define DEBUG_VIDEO_GEM	1*/

#define GEM_VID_DRIVER_NAME "gem"

#undef MIN

#define MIN(a,b) (((a)<(b)) ? (a) : (b))

#undef MAX

#define MAX(a,b) (((a)>(b)) ? (a) : (b))

/* Variables */

static unsigned char vdi_index[256] = {

    0, 2, 3, 6, 4, 7, 5, 8,

    9, 10, 11, 14, 12, 15, 13, 255

};

static const unsigned char empty_name[] = "";

/* Initialization/Query functions */

static int GEM_VideoInit(_THIS, SDL_PixelFormat * vformat);

static SDL_Rect **GEM_ListModes(_THIS, SDL_PixelFormat * format,

                                Uint32 flags);

static SDL_Surface *GEM_SetVideoMode(_THIS, SDL_Surface * current, int width,

                                     int height, int bpp, Uint32 flags);

static int GEM_SetColors(_THIS, int firstcolor, int ncolors,

                         SDL_Color * colors);

static void GEM_VideoQuit(_THIS);

/* Hardware surface functions */

static int GEM_AllocHWSurface(_THIS, SDL_Surface * surface);

static int GEM_LockHWSurface(_THIS, SDL_Surface * surface);

static int GEM_FlipHWSurface(_THIS, SDL_Surface * surface);

static void GEM_UnlockHWSurface(_THIS, SDL_Surface * surface);

static void GEM_FreeHWSurface(_THIS, SDL_Surface * surface);

static void GEM_UpdateRects(_THIS, int numrects, SDL_Rect * rects);

#if 0

static int GEM_ToggleFullScreen(_THIS, int on);

#endif

/* Internal functions */

static void GEM_FreeBuffers(_THIS);

static void GEM_ClearScreen(_THIS);

static void GEM_ClearRect(_THIS, short *rect);

static void GEM_SetNewPalette(_THIS, Uint16 newpal[256][3]);

static void GEM_LockScreen(_THIS);

static void GEM_UnlockScreen(_THIS);

static void refresh_window(_THIS, int winhandle, short *rect);

#if SDL_VIDEO_OPENGL

/* OpenGL functions */

static void GEM_GL_SwapBuffers(_THIS);

#endif

/* GEM driver bootstrap functions */

static int

GEM_Available(void)

{

    /* Test if AES available */

    if (appl_init() == -1)

        return 0;

    appl_exit();

    return 1;

}

static void

GEM_DeleteDevice(SDL_VideoDevice * device)

{

    SDL_free(device->hidden);

    SDL_free(device);

}

static SDL_VideoDevice *

GEM_CreateDevice(int devindex)

{

    SDL_VideoDevice *device;

    int vectors_mask;

    unsigned long dummy;

    /* Initialize all variables that we clean on shutdown */

    device = (SDL_VideoDevice *) SDL_malloc(sizeof(SDL_VideoDevice));

    if (device) {

        SDL_memset(device, 0, (sizeof *device));

        device->hidden = (struct SDL_PrivateVideoData *)

            SDL_malloc((sizeof *device->hidden));

        device->gl_data = (struct SDL_PrivateGLData *)

            SDL_malloc((sizeof *device->gl_data));

    }

    if ((device == NULL) || (device->hidden == NULL)) {

        SDL_OutOfMemory();

        if (device) {

            SDL_free(device);

        }

        return (0);

    }

    SDL_memset(device->hidden, 0, (sizeof *device->hidden));

    SDL_memset(device->gl_data, 0, sizeof(*device->gl_data));

    /* Set the function pointers */

    device->VideoInit = GEM_VideoInit;

    device->ListModes = GEM_ListModes;

    device->SetVideoMode = GEM_SetVideoMode;

    device->SetColors = GEM_SetColors;

    device->UpdateRects = NULL /*GEM_UpdateRects */ ;

    device->VideoQuit = GEM_VideoQuit;

    device->AllocHWSurface = GEM_AllocHWSurface;

    device->LockHWSurface = GEM_LockHWSurface;

    device->UnlockHWSurface = GEM_UnlockHWSurface;

    device->FlipHWSurface = GEM_FlipHWSurface;

    device->FreeHWSurface = GEM_FreeHWSurface;

    device->ToggleFullScreen = NULL /*GEM_ToggleFullScreen */ ;

    /* Window manager */

    device->SetCaption = GEM_SetCaption;

    device->SetIcon = GEM_SetIcon;

    device->IconifyWindow = GEM_IconifyWindow;

    device->GrabInput = GEM_GrabInput;

    /* Events */

    device->InitOSKeymap = GEM_InitOSKeymap;

    device->PumpEvents = GEM_PumpEvents;

    /* Mouse */

    device->FreeWMCursor = GEM_FreeWMCursor;

    device->CreateWMCursor = GEM_CreateWMCursor;

    device->ShowWMCursor = GEM_ShowWMCursor;

    device->WarpWMCursor = NULL /*GEM_WarpWMCursor */ ;

    device->CheckMouseMode = GEM_CheckMouseMode;

#if SDL_VIDEO_OPENGL

    /* OpenGL functions */

    device->GL_LoadLibrary = SDL_AtariGL_LoadLibrary;

    device->GL_GetProcAddress = SDL_AtariGL_GetProcAddress;

    device->GL_GetAttribute = SDL_AtariGL_GetAttribute;

    device->GL_MakeCurrent = SDL_AtariGL_MakeCurrent;

    device->GL_SwapBuffers = GEM_GL_SwapBuffers;

#endif

    device->hidden->use_dev_mouse =

        (SDL_AtariDevMouse_Open() != 0) ? SDL_TRUE : SDL_FALSE;

    vectors_mask = ATARI_XBIOS_JOYSTICKEVENTS;  /* XBIOS joystick events */

    if (!(device->hidden->use_dev_mouse)) {

        vectors_mask |= ATARI_XBIOS_MOUSEEVENTS;        /* XBIOS mouse events */

    }

    /*if (Getcookie(C_MiNT, &dummy) == C_FOUND) {

       vectors_mask = 0;

       } */

    SDL_AtariXbios_InstallVectors(vectors_mask);

    device->free = GEM_DeleteDevice;

    return device;

}

VideoBootStrap GEM_bootstrap = {

    GEM_VID_DRIVER_NAME, "Atari GEM video driver",

    GEM_Available, GEM_CreateDevice

};

static void

VDI_ReadExtInfo(_THIS, short *work_out)

{

    unsigned long EdDI_version;

    unsigned long cookie_EdDI;

    Uint32 num_colours;

    Uint16 clut_type, num_bits;

    /* Read EdDI informations */

    if (Getcookie(C_EdDI, &cookie_EdDI) == C_NOTFOUND) {

        return;

    }

    EdDI_version = Atari_get_EdDI_version((void *) cookie_EdDI);

    vq_scrninfo(VDI_handle, work_out);

    VDI_format = work_out[0];

    clut_type = work_out[1];

    num_bits = work_out[2];

    num_colours = *((Uint32 *) & work_out[3]);

    /* With EdDI>=1.1, we can have screen pitch, address and format

     * so we can directly write to screen without using vro_cpyfm

     */

    if (EdDI_version >= EDDI_11) {

        VDI_pitch = work_out[5];

        VDI_screen = (void *) *((unsigned long *) &work_out[6]);

    }

    switch (clut_type) {

    case VDI_CLUT_HARDWARE:

        {

            int i;

            Uint16 *tmp_p;

            tmp_p = (Uint16 *) & work_out[16];

            for (i = 0; i < 256; i++) {

                vdi_index[*tmp_p++] = i;

            }

        }

        break;

    case VDI_CLUT_SOFTWARE:

        {

            int component;      /* red, green, blue, alpha, overlay */

            int num_bit;

            unsigned short *tmp_p;

            /* We can build masks with info here */

            tmp_p = (unsigned short *) &work_out[16];

            for (component = 0; component < 5; component++) {

                for (num_bit = 0; num_bit < 16; num_bit++) {

                    unsigned short valeur;

                    valeur = *tmp_p++;

                    if (valeur == 0xffff) {

                        continue;

                    }

                    switch (component) {

                    case 0:

                        VDI_redmask |= 1 << valeur;

                        break;

                    case 1:

                        VDI_greenmask |= 1 << valeur;

                        break;

                    case 2:

                        VDI_bluemask |= 1 << valeur;

                        break;

                    case 3:

                        VDI_alphamask |= 1 << valeur;

                        break;

                    }

                }

            }

        }

        /* Remove lower green bits for Intel endian screen */

        if ((VDI_greenmask == ((7 << 13) | 3))

            || (VDI_greenmask == ((7 << 13) | 7))) {

            VDI_greenmask &= ~(7 << 13);

        }

        break;

    case VDI_CLUT_NONE:

        break;

    }

}

int

GEM_VideoInit(_THIS, SDL_PixelFormat * vformat)

{

    int i, menubar_size;

    short work_in[12], work_out[272], dummy;

    /* Open AES (Application Environment Services) */

    if (appl_init() == -1) {

        fprintf(stderr, "Can not open AES\n");

        return 1;

    }

    /* Read version and features */

    GEM_version = aes_global[0];

    if (GEM_version >= 0x0410) {

        short ap_gout[4], errorcode;

        GEM_wfeatures = 0;

        errorcode =

            appl_getinfo(AES_WINDOW, &ap_gout[0], &ap_gout[1], &ap_gout[2],

                         &ap_gout[3]);

        if (errorcode == 0) {

            GEM_wfeatures = ap_gout[0];

        }

    }

    /* Ask VDI physical workstation handle opened by AES */

    VDI_handle = graf_handle(&dummy, &dummy, &dummy, &dummy);

    if (VDI_handle < 1) {

        fprintf(stderr, "Wrong VDI handle %d returned by AES\n", VDI_handle);

        return 1;

    }

    /* Open virtual VDI workstation */

    work_in[0] = Getrez() + 2;

    for (i = 1; i < 10; i++)

        work_in[i] = 1;

    work_in[10] = 2;

    v_opnvwk(work_in, &VDI_handle, work_out);

    if (VDI_handle == 0) {

        fprintf(stderr, "Can not open VDI virtual workstation\n");

        return 1;

    }

    /* Read fullscreen size */

    VDI_w = work_out[0] + 1;

    VDI_h = work_out[1] + 1;

    /* Read desktop size and position */

    if (!wind_get

        (DESKTOP_HANDLE, WF_WORKXYWH, &GEM_desk_x, &GEM_desk_y, &GEM_desk_w,

         &GEM_desk_h)) {

        fprintf(stderr, "Can not read desktop properties\n");

        return 1;

    }

    /* Read bit depth */

    vq_extnd(VDI_handle, 1, work_out);

    VDI_bpp = work_out[4];

    VDI_oldnumcolors = 0;

    switch (VDI_bpp) {

    case 8:

        VDI_pixelsize = 1;

        break;

    case 15:

    case 16:

        VDI_pixelsize = 2;

        break;

    case 24:

        VDI_pixelsize = 3;

        break;

    case 32:

        VDI_pixelsize = 4;

        break;

    default:

        fprintf(stderr, "%d bits colour depth not supported\n", VDI_bpp);

        return 1;

    }

    /* Setup hardware -> VDI palette mapping */

    for (i = 16; i < 255; i++) {

        vdi_index[i] = i;

    }

    vdi_index[255] = 1;

    /* Save current palette */

    if (VDI_bpp > 8) {

        VDI_oldnumcolors = 1 << 8;

    } else {

        VDI_oldnumcolors = 1 << VDI_bpp;

    }

    for (i = 0; i < VDI_oldnumcolors; i++) {

        short rgb[3];

        vq_color(VDI_handle, i, 0, rgb);

        VDI_oldpalette[i][0] = rgb[0];

        VDI_oldpalette[i][1] = rgb[1];

        VDI_oldpalette[i][2] = rgb[2];

    }

    VDI_setpalette = GEM_SetNewPalette;

    SDL_memcpy(VDI_curpalette, VDI_oldpalette, sizeof(VDI_curpalette));

    /* Setup screen info */

    GEM_title_name = empty_name;

    GEM_icon_name = empty_name;

    GEM_handle = -1;

    GEM_locked = SDL_FALSE;

    GEM_win_fulled = SDL_FALSE;

    GEM_fullscreen = SDL_FALSE;

    GEM_lock_redraw = SDL_TRUE; /* Prevent redraw till buffers are setup */

    VDI_screen = NULL;

    VDI_pitch = VDI_w * VDI_pixelsize;

    VDI_format = ((VDI_bpp <= 8) ? VDI_FORMAT_INTER : VDI_FORMAT_PACK);

    VDI_redmask = VDI_greenmask = VDI_bluemask = VDI_alphamask = 0;

    VDI_ReadExtInfo(this, work_out);

#ifdef DEBUG_VIDEO_GEM

    printf("sdl:video:gem: screen: address=0x%08x, pitch=%d\n", VDI_screen,

           VDI_pitch);

    printf("sdl:video:gem: format=%d\n", VDI_format);

    printf("sdl:video:gem: masks: 0x%08x, 0x%08x, 0x%08x, 0x%08x\n",

           VDI_alphamask, VDI_redmask, VDI_greenmask, VDI_bluemask);

#endif

    /* Setup destination mfdb */

    VDI_dst_mfdb.fd_addr = NULL;

    /* Determine the current screen size */

    this->info.current_w = VDI_w;

    this->info.current_h = VDI_h;

    /* Determine the screen depth */

    /* we change this during the SDL_SetVideoMode implementation... */

    vformat->BitsPerPixel = VDI_bpp;

    /* Set mouse cursor to arrow */

    graf_mouse(ARROW, NULL);

    /* Init chunky to planar routine */

    SDL_Atari_C2pConvert = SDL_Atari_C2pConvert8;

    /* Setup VDI fill functions */

    vsf_color(VDI_handle, 0);

    vsf_interior(VDI_handle, 1);

    vsf_perimeter(VDI_handle, 0);

    /* Menu bar save buffer */

    menubar_size = GEM_desk_w * GEM_desk_y * VDI_pixelsize;

    GEM_menubar = Atari_SysMalloc(menubar_size, MX_PREFTTRAM);

    /* Fill video modes list */

    SDL_modelist[0] = SDL_malloc(sizeof(SDL_Rect));

    SDL_modelist[0]->x = 0;

    SDL_modelist[0]->y = 0;

    SDL_modelist[0]->w = VDI_w;

    SDL_modelist[0]->h = VDI_h;

    SDL_modelist[1] = NULL;

#if SDL_VIDEO_OPENGL

    SDL_AtariGL_InitPointers(this);

#endif

    this->info.wm_available = 1;

    /* We're done! */

    return (0);

}

SDL_Rect **

GEM_ListModes(_THIS, SDL_PixelFormat * format, Uint32 flags)

{

    if (format->BitsPerPixel != VDI_bpp) {

        return ((SDL_Rect **) NULL);

    }

    if (flags & SDL_FULLSCREEN) {

        return (SDL_modelist);

    }

    return ((SDL_Rect **) - 1);

}

static void

GEM_FreeBuffers(_THIS)

{

    /* Release buffer */

    if (GEM_buffer2) {

        Mfree(GEM_buffer2);

        GEM_buffer2 = NULL;

    }

    if (GEM_buffer1) {

        Mfree(GEM_buffer1);

        GEM_buffer1 = NULL;

    }

}

static void

GEM_ClearRect(_THIS, short *rect)

{

    short oldrgb[3], rgb[3] = { 0, 0, 0 };

    vq_color(VDI_handle, vdi_index[0], 0, oldrgb);

    vs_color(VDI_handle, vdi_index[0], rgb);

    vsf_color(VDI_handle, 0);

    vsf_interior(VDI_handle, 1);

    vsf_perimeter(VDI_handle, 0);

    v_bar(VDI_handle, rect);

    vs_color(VDI_handle, vdi_index[0], oldrgb);

}

static void

GEM_ClearScreen(_THIS)

{

    short pxy[4];

    v_hide_c(VDI_handle);

    pxy[0] = pxy[1] = 0;

    pxy[2] = VDI_w - 1;

    pxy[3] = VDI_h - 1;

    GEM_ClearRect(this, pxy);

    v_show_c(VDI_handle, 1);

}

static void

GEM_SetNewPalette(_THIS, Uint16 newpal[256][3])

{

    int i;

    short rgb[3];

    if (VDI_oldnumcolors == 0)

        return;

    for (i = 0; i < VDI_oldnumcolors; i++) {

        rgb[0] = newpal[i][0];

        rgb[1] = newpal[i][1];

        rgb[2] = newpal[i][2];

        vs_color(VDI_handle, i, rgb);

    }

}

static void

GEM_LockScreen(_THIS)

{

    if (!GEM_locked) {

        /* Lock AES */

        wind_update(BEG_UPDATE);

        wind_update(BEG_MCTRL);

        /* Reserve memory space, used to be sure of compatibility */

        form_dial(FMD_START, 0, 0, 0, 0, 0, 0, VDI_w, VDI_h);

        /* Save menu bar */

        if (GEM_menubar) {

            MFDB mfdb_src;

            short blitcoords[8];

            mfdb_src.fd_addr = GEM_menubar;

            mfdb_src.fd_w = GEM_desk_w;

            mfdb_src.fd_h = GEM_desk_y;

            mfdb_src.fd_wdwidth = GEM_desk_w >> 4;

            mfdb_src.fd_nplanes = VDI_bpp;

            mfdb_src.fd_stand =

                mfdb_src.fd_r1 = mfdb_src.fd_r2 = mfdb_src.fd_r3 = 0;

            blitcoords[0] = blitcoords[4] = 0;

            blitcoords[1] = blitcoords[5] = 0;

            blitcoords[2] = blitcoords[6] = GEM_desk_w - 1;

            blitcoords[3] = blitcoords[7] = GEM_desk_y - 1;

            vro_cpyfm(VDI_handle, S_ONLY, blitcoords, &VDI_dst_mfdb,

                      &mfdb_src);

        }

        GEM_locked = SDL_TRUE;

    }

}

static void

GEM_UnlockScreen(_THIS)

{

    if (GEM_locked) {

        /* Restore menu bar */

        if (GEM_menubar) {

            MFDB mfdb_src;

            short blitcoords[8];

            mfdb_src.fd_addr = GEM_menubar;

            mfdb_src.fd_w = GEM_desk_w;

            mfdb_src.fd_h = GEM_desk_y;

            mfdb_src.fd_wdwidth = GEM_desk_w >> 4;

            mfdb_src.fd_nplanes = VDI_bpp;

            mfdb_src.fd_stand =

                mfdb_src.fd_r1 = mfdb_src.fd_r2 = mfdb_src.fd_r3 = 0;

            blitcoords[0] = blitcoords[4] = 0;

            blitcoords[1] = blitcoords[5] = 0;

            blitcoords[2] = blitcoords[6] = GEM_desk_w - 1;

            blitcoords[3] = blitcoords[7] = GEM_desk_y - 1;

            vro_cpyfm(VDI_handle, S_ONLY, blitcoords, &mfdb_src,

                      &VDI_dst_mfdb);

        }

        /* Restore screen memory, and send REDRAW to all apps */

        form_dial(FMD_FINISH, 0, 0, 0, 0, 0, 0, VDI_w, VDI_h);

        /* Unlock AES */

        wind_update(END_MCTRL);

        wind_update(END_UPDATE);

        GEM_locked = SDL_FALSE;

    }

}

SDL_Surface *

GEM_SetVideoMode(_THIS, SDL_Surface * current,

                 int width, int height, int bpp, Uint32 flags)

{

    int maxwidth, maxheight;

    Uint32 modeflags, screensize;

    SDL_bool use_shadow1, use_shadow2;

        /*--- Verify if asked mode can be used ---*/

    if (flags & SDL_FULLSCREEN) {

        maxwidth = VDI_w;

        maxheight = VDI_h;

    } else {

        /* Windowed mode */

        maxwidth = GEM_desk_w;

        maxheight = GEM_desk_h;

    }

    /* width must be multiple of 16, for vro_cpyfm() and c2p_convert() */

    if ((width & 15) != 0) {

        width = (width | 15) + 1;

    }

    if ((maxwidth < width) || (maxheight < height) || (VDI_bpp != bpp)) {

        SDL_SetError("Couldn't find requested mode in list");

        return (NULL);

    }

        /*--- Allocate the new pixel format for the screen ---*/

    if (!SDL_ReallocFormat

        (current, VDI_bpp, VDI_redmask, VDI_greenmask, VDI_bluemask,

         VDI_alphamask)) {

        SDL_SetError("Couldn't allocate new pixel format for requested mode");

        return (NULL);

    }

    screensize = width * height * VDI_pixelsize;

#ifdef DEBUG_VIDEO_GEM

    printf("sdl:video:gem: setvideomode(): %dx%dx%d = %d\n", width, height,

           bpp, screensize);

#endif

        /*--- Allocate shadow buffers if needed, and conversion operations ---*/

    GEM_FreeBuffers(this);

    GEM_bufops = 0;

    use_shadow1 = use_shadow2 = SDL_FALSE;

    if (VDI_screen && (flags & SDL_FULLSCREEN)) {

        if (VDI_format == VDI_FORMAT_INTER) {

            use_shadow1 = SDL_TRUE;

            GEM_bufops = B2S_C2P_1TOS;

        }

    } else {

        use_shadow1 = SDL_TRUE;

        if (VDI_format == VDI_FORMAT_PACK) {

            GEM_bufops = B2S_VROCPYFM_1TOS;

        } else {

            use_shadow2 = SDL_TRUE;

            GEM_bufops = B2S_C2P_1TO2 | B2S_VROCPYFM_2TOS;

        }

    }

    if (use_shadow1) {

        GEM_buffer1 = Atari_SysMalloc(screensize, MX_PREFTTRAM);

        if (GEM_buffer1 == NULL) {

            SDL_SetError("Can not allocate %d KB for frame buffer",

                         screensize >> 10);

            return NULL;

        }

        SDL_memset(GEM_buffer1, 0, screensize);

#ifdef DEBUG_VIDEO_GEM

        printf("sdl:video:gem: setvideomode(): allocated buffer 1\n");

#endif

    }

    if (use_shadow2) {

        GEM_buffer2 = Atari_SysMalloc(screensize, MX_PREFTTRAM);

        if (GEM_buffer2 == NULL) {

            SDL_SetError("Can not allocate %d KB for shadow buffer",

                         screensize >> 10);

            return NULL;

        }

        SDL_memset(GEM_buffer2, 0, screensize);

#ifdef DEBUG_VIDEO_GEM

        printf("sdl:video:gem: setvideomode(): allocated buffer 2\n");

#endif

    }

        /*--- Initialize screen ---*/

    modeflags = SDL_PREALLOC;

    if (VDI_bpp == 8) {

        modeflags |= SDL_HWPALETTE;

    }

    if (flags & SDL_FULLSCREEN) {

        GEM_LockScreen(this);

        GEM_ClearScreen(this);

        modeflags |= SDL_FULLSCREEN;

        if (VDI_screen && (VDI_format == VDI_FORMAT_PACK) && !use_shadow1) {

            modeflags |= SDL_HWSURFACE;

        } else {

            modeflags |= SDL_SWSURFACE;

        }

        GEM_fullscreen = SDL_TRUE;

    } else {

        int old_win_type;

        short x2, y2, w2, h2;

        GEM_UnlockScreen(this);

        /* Set window gadgets */

        old_win_type = GEM_win_type;

        if (!(flags & SDL_NOFRAME)) {

            GEM_win_type = NAME | MOVER | CLOSER | SMALLER;

            if (flags & SDL_RESIZABLE) {

                GEM_win_type |= FULLER | SIZER;

                modeflags |= SDL_RESIZABLE;

            }

        } else {

            GEM_win_type = 0;

            modeflags |= SDL_NOFRAME;

        }

        modeflags |= SDL_SWSURFACE;

        /* Recreate window ? only for different widget or non-created window */

        if ((old_win_type != GEM_win_type) || (GEM_handle < 0)) {

            /* Calculate window size */

            if (!wind_calc

                (WC_BORDER, GEM_win_type, 0, 0, width, height, &x2, &y2,

                 &w2, &h2)) {

                GEM_FreeBuffers(this);

                SDL_SetError("Can not calculate window attributes");

                return NULL;

            }

            /* Center window */

            x2 = GEM_desk_x + ((GEM_desk_w - w2) >> 1);

            y2 = GEM_desk_y + ((GEM_desk_h - h2) >> 1);

            /* Destroy existing window */

            if (GEM_handle >= 0) {

                wind_close(GEM_handle);

                wind_delete(GEM_handle);

            }

            /* Create window */

            GEM_handle = wind_create(GEM_win_type, x2, y2, w2, h2);

            if (GEM_handle < 0) {

                GEM_FreeBuffers(this);

                SDL_SetError("Can not create window");

                return NULL;

            }

#ifdef DEBUG_VIDEO_GEM

            printf("sdl:video:gem: handle=%d\n", GEM_handle);

#endif

            /* Setup window name */

            wind_set(GEM_handle, WF_NAME,

                     (short) (((unsigned long) GEM_title_name) >> 16),

                     (short) (((unsigned long) GEM_title_name) & 0xffff),

                     0, 0);

            GEM_refresh_name = SDL_FALSE;

            /* Open the window */

            wind_open(GEM_handle, x2, y2, w2, h2);

        } else {

            /* Resize window if needed, to fit asked video mode */

            if (modeflags & SDL_RESIZABLE) {

                wind_get(GEM_handle, WF_WORKXYWH, &x2, &y2, &w2, &h2);

                if ((w2 & 15) != 0) {

                    w2 = (w2 | 15) + 1;

                }

                if ((w2 != width) || (h2 != height)) {

                    if (wind_calc

                        (WC_BORDER, GEM_win_type, x2, y2, width,

                         height, &x2, &y2, &w2, &h2)) {

                        wind_set(GEM_handle, WF_CURRXYWH, x2, y2, w2, h2);

                    }

                }

            }

        }

        GEM_fullscreen = SDL_FALSE;

    }

    /* Set up the new mode framebuffer */

    current->w = width;

    current->h = height;

    if (use_shadow1) {

        current->pixels = GEM_buffer1;

        current->pitch = width * VDI_pixelsize;

    } else {

        current->pixels = VDI_screen;

        current->pitch = VDI_pitch;

    }

#if SDL_VIDEO_OPENGL

    if (flags & SDL_INTERNALOPENGL) {

        if (!SDL_AtariGL_Init(this, current)) {

            GEM_FreeBuffers(this);

            SDL_SetError("Can not create OpenGL context");

            return NULL;

        }

        modeflags |= SDL_INTERNALOPENGL;

    }

#endif

    current->flags = modeflags;

#ifdef DEBUG_VIDEO_GEM

    printf("sdl:video:gem: surface: %dx%d\n", current->w, current->h);

#endif

    this->UpdateRects = GEM_UpdateRects;

    GEM_lock_redraw = SDL_FALSE;        /* Enable redraw */

    /* We're done */

    return (current);

}

static int

GEM_AllocHWSurface(_THIS, SDL_Surface * surface)

{

    return -1;

}

static void

GEM_FreeHWSurface(_THIS, SDL_Surface * surface)

{

    return;

}

static int

GEM_LockHWSurface(_THIS, SDL_Surface * surface)

{

    return (0);

}

static void

GEM_UnlockHWSurface(_THIS, SDL_Surface * surface)

{

    return;

}

static void

GEM_UpdateRectsFullscreen(_THIS, int numrects, SDL_Rect * rects)

{

    SDL_Surface *surface;

    int i, surf_width;

    surface = this->screen;

    /* Need to be a multiple of 16 pixels */

    surf_width = surface->w;

    if ((surf_width & 15) != 0) {

        surf_width = (surf_width | 15) + 1;

    }

    if (GEM_bufops & (B2S_C2P_1TO2 | B2S_C2P_1TOS)) {

        void *destscr;

        int destpitch;

        if (GEM_bufops & B2S_C2P_1TOS) {

            destscr = VDI_screen;

            destpitch = VDI_pitch;

        } else {

            destscr = GEM_buffer2;

            destpitch = surface->pitch;

        }

        for (i = 0; i < numrects; i++) {

            void *source, *destination;

            int x1, x2;

            x1 = rects[i].x & ~15;

            x2 = rects[i].x + rects[i].w;

            if (x2 & 15) {

                x2 = (x2 | 15) + 1;

            }

            source = surface->pixels;

            source += surface->pitch * rects[i].y;

            source += x1;

            destination = destscr;

            destination += destpitch * rects[i].y;

            destination += x1;

            SDL_Atari_C2pConvert(source, destination,

                                 x2 - x1, rects[i].h,

                                 SDL_FALSE, surface->pitch, destpitch);

        }

    }

    if (GEM_bufops & (B2S_VROCPYFM_1TOS | B2S_VROCPYFM_2TOS)) {

        MFDB mfdb_src;

        short blitcoords[8];

        mfdb_src.fd_addr = surface->pixels;

        mfdb_src.fd_w = surf_width;

        mfdb_src.fd_h = surface->h;

        mfdb_src.fd_wdwidth = (surface->pitch / VDI_pixelsize) >> 4;

        mfdb_src.fd_nplanes = surface->format->BitsPerPixel;

        mfdb_src.fd_stand =

            mfdb_src.fd_r1 = mfdb_src.fd_r2 = mfdb_src.fd_r3 = 0;

        if (GEM_bufops & B2S_VROCPYFM_2TOS) {

            mfdb_src.fd_addr = GEM_buffer2;

        }

        for (i = 0; i < numrects; ++i) {

            blitcoords[0] = blitcoords[4] = rects[i].x;

            blitcoords[1] = blitcoords[5] = rects[i].y;

            blitcoords[2] = blitcoords[6] = rects[i].x + rects[i].w - 1;

            blitcoords[3] = blitcoords[7] = rects[i].y + rects[i].h - 1;

            vro_cpyfm(VDI_handle, S_ONLY, blitcoords, &mfdb_src,

                      &VDI_dst_mfdb);

        }

    }

}

static void

GEM_UpdateRectsWindowed(_THIS, int numrects, SDL_Rect * rects)

{

    short pxy[4], wind_pxy[4];

    int i;

    if (wind_get

        (GEM_handle, WF_WORKXYWH, &wind_pxy[0], &wind_pxy[1], &wind_pxy[2],

         &wind_pxy[3]) == 0) {

        return;

    }

    for (i = 0; i < numrects; ++i) {

        pxy[0] = wind_pxy[0] + rects[i].x;

        pxy[1] = wind_pxy[1] + rects[i].y;

        pxy[2] = rects[i].w;

        pxy[3] = rects[i].h;

        GEM_wind_redraw(this, GEM_handle, pxy);

    }

}

static void

GEM_UpdateRects(_THIS, int numrects, SDL_Rect * rects)

{

    SDL_Surface *surface;

    if (GEM_lock_redraw) {

        return;

    }