src/SDL/video_sdl.cpp

/*
 *  video_sdl.cpp - Video/graphics emulation, SDL specific stuff
 *
 *  Basilisk II (C) 1997-2005 Christian Bauer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 *  NOTES:
 *    The Ctrl key works like a qualifier for special actions:
 *      Ctrl-Tab = suspend DGA mode (TODO)
 *      Ctrl-Esc = emergency quit
 *      Ctrl-F1 = mount floppy
 *      Ctrl-F5 = grab mouse (in windowed mode)
 *
 *  FIXMEs and TODOs:
 *  - Windows requires an extra mouse event to update the actual cursor image?
 *  - Ctr-Tab for suspend/resume but how? SDL does not support that for non-Linux
 *  - Ctrl-Fn doesn't generate SDL_KEYDOWN events (SDL bug?)
 *  - Mouse acceleration, there is no API in SDL yet for that
 *  - Force relative mode in Grab mode even if SDL provides absolute coordinates?
 *  - Gamma tables support is likely to be broken here
 *  - Events processing is bound to the general emulation thread as SDL requires
 *    to PumpEvents() within the same thread as the one that called SetVideoMode().
 *    Besides, there can't seem to be a way to call SetVideoMode() from a child thread.
 *  - Backport hw cursor acceleration to Basilisk II?
 *  - Factor out code
 */

#include "sysdeps.h"

#include <SDL.h>
#include <SDL_mutex.h>
#include <SDL_thread.h>
#include <errno.h>
#include <vector>

#ifdef WIN32
#include <malloc.h> /* alloca() */
#endif

#include "cpu_emulation.h"
#include "main.h"
#include "adb.h"
#include "macos_util.h"
#include "prefs.h"
#include "user_strings.h"
#include "video.h"
#include "video_defs.h"
#include "video_blit.h"
#include "vm_alloc.h"

#define DEBUG 0
#include "debug.h"


// Supported video modes
using std::vector;
static vector<VIDEO_MODE> VideoModes;

// Display types
#ifdef SHEEPSHAVER
enum {
        DISPLAY_WINDOW = DIS_WINDOW,                                    // windowed display
        DISPLAY_SCREEN = DIS_SCREEN                                             // fullscreen display
};
extern int display_type;                                                        // See enum above
#else
enum {
        DISPLAY_WINDOW,                                                                 // windowed display
        DISPLAY_SCREEN                                                                  // fullscreen display
};
static int display_type = DISPLAY_WINDOW;                       // See enum above
#endif

// Constants
#ifdef WIN32
const char KEYCODE_FILE_NAME[] = "BasiliskII_keycodes";
#else
const char KEYCODE_FILE_NAME[] = DATADIR "/keycodes";
#endif


// Global variables
static int32 frame_skip;                                                        // Prefs items
static int16 mouse_wheel_mode;
static int16 mouse_wheel_lines;

static uint8 *the_buffer = NULL;                                        // Mac frame buffer (where MacOS draws into)
static uint8 *the_buffer_copy = NULL;                           // Copy of Mac frame buffer (for refreshed modes)
static uint32 the_buffer_size;                                          // Size of allocated the_buffer

static bool redraw_thread_active = false;                       // Flag: Redraw thread installed
#ifndef USE_CPU_EMUL_SERVICES
static volatile bool redraw_thread_cancel;                      // Flag: Cancel Redraw thread
static SDL_Thread *redraw_thread = NULL;                        // Redraw thread
#ifdef SHEEPSHAVER
static volatile bool thread_stop_req = false;
static volatile bool thread_stop_ack = false;           // Acknowledge for thread_stop_req
#endif
#endif

#ifdef ENABLE_VOSF
static bool use_vosf = false;                                           // Flag: VOSF enabled
#else
static const bool use_vosf = false;                                     // VOSF not possible
#endif

static bool ctrl_down = false;                                          // Flag: Ctrl key pressed
static bool caps_on = false;                                            // Flag: Caps Lock on
static bool quit_full_screen = false;                           // Flag: DGA close requested from redraw thread
static bool emerg_quit = false;                                         // Flag: Ctrl-Esc pressed, emergency quit requested from MacOS thread
static bool emul_suspended = false;                                     // Flag: Emulator suspended

static bool classic_mode = false;                                       // Flag: Classic Mac video mode

static bool use_keycodes = false;                                       // Flag: Use keycodes rather than keysyms
static int keycode_table[256];                                          // X keycode -> Mac keycode translation table

// SDL variables
static int screen_depth;                                                        // Depth of current screen
static SDL_Cursor *sdl_cursor;                                          // Copy of Mac cursor
static volatile bool cursor_changed = false;            // Flag: cursor changed, redraw_func must update the cursor
static SDL_Color sdl_palette[256];                                      // Color palette to be used as CLUT and gamma table
static bool sdl_palette_changed = false;                        // Flag: Palette changed, redraw thread must set new colors
static const int sdl_eventmask = SDL_MOUSEBUTTONDOWNMASK | SDL_MOUSEBUTTONUPMASK | SDL_MOUSEMOTIONMASK | SDL_KEYUPMASK | SDL_KEYDOWNMASK | SDL_VIDEOEXPOSEMASK | SDL_QUITMASK;

// Mutex to protect SDL events
static SDL_mutex *sdl_events_lock = NULL;
#define LOCK_EVENTS SDL_LockMutex(sdl_events_lock)
#define UNLOCK_EVENTS SDL_UnlockMutex(sdl_events_lock)

// Mutex to protect palette
static SDL_mutex *sdl_palette_lock = NULL;
#define LOCK_PALETTE SDL_LockMutex(sdl_palette_lock)
#define UNLOCK_PALETTE SDL_UnlockMutex(sdl_palette_lock)

// Mutex to protect frame buffer
static SDL_mutex *frame_buffer_lock = NULL;
#define LOCK_FRAME_BUFFER SDL_LockMutex(frame_buffer_lock)
#define UNLOCK_FRAME_BUFFER SDL_UnlockMutex(frame_buffer_lock)

// Video refresh function
static void VideoRefreshInit(void);
static void (*video_refresh)(void);


// Prototypes
static int redraw_func(void *arg);

// From sys_unix.cpp
extern void SysMountFirstFloppy(void);


/*
 *  SDL surface locking glue
 */

#ifdef ENABLE_VOSF
#define SDL_VIDEO_LOCK_VOSF_SURFACE(SURFACE) do {                               \
        if ((SURFACE)->flags & (SDL_HWSURFACE | SDL_FULLSCREEN))        \
                the_host_buffer = (uint8 *)(SURFACE)->pixels;                   \
} while (0)
#else
#define SDL_VIDEO_LOCK_VOSF_SURFACE(SURFACE)
#endif

#define SDL_VIDEO_LOCK_SURFACE(SURFACE) do {    \
        if (SDL_MUSTLOCK(SURFACE)) {                            \
                SDL_LockSurface(SURFACE);                               \
                SDL_VIDEO_LOCK_VOSF_SURFACE(SURFACE);   \
        }                                                                                       \
} while (0)

#define SDL_VIDEO_UNLOCK_SURFACE(SURFACE) do {  \
        if (SDL_MUSTLOCK(SURFACE))                                      \
                SDL_UnlockSurface(SURFACE);                             \
} while (0)


/*
 *  Framebuffer allocation routines
 */

static void *vm_acquire_framebuffer(uint32 size)
{
        // always try to reallocate framebuffer at the same address
        static void *fb = VM_MAP_FAILED;
        if (fb != VM_MAP_FAILED) {
                if (vm_acquire_fixed(fb, size) < 0) {
#ifndef SHEEPSHAVER
                        printf("FATAL: Could not reallocate framebuffer at previous address\n");
#endif
                        fb = VM_MAP_FAILED;
                }
        }
        if (fb == VM_MAP_FAILED)
                fb = vm_acquire(size, VM_MAP_DEFAULT | VM_MAP_32BIT);
        return fb;
}

static inline void vm_release_framebuffer(void *fb, uint32 size)
{
        vm_release(fb, size);
}


/*
 *  Windows message handler
 */

#ifdef WIN32
#include <dbt.h>
static WNDPROC sdl_window_proc = NULL;                          // Window proc used by SDL

extern void SysMediaArrived(void);
extern void SysMediaRemoved(void);
extern HWND GetMainWindowHandle(void);

static LRESULT CALLBACK windows_message_handler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
        switch (msg) {
        case WM_DEVICECHANGE:
                if (wParam == DBT_DEVICEREMOVECOMPLETE) {
                        DEV_BROADCAST_HDR *p = (DEV_BROADCAST_HDR *)lParam;
                        if (p->dbch_devicetype == DBT_DEVTYP_VOLUME)
                                SysMediaRemoved();
                }
                else if (wParam == DBT_DEVICEARRIVAL) {
                        DEV_BROADCAST_HDR *p = (DEV_BROADCAST_HDR *)lParam;
                        if (p->dbch_devicetype == DBT_DEVTYP_VOLUME)
                                SysMediaArrived();
                }
                return 0;

        default:
                if (sdl_window_proc)
                        return CallWindowProc(sdl_window_proc, hwnd, msg, wParam, lParam);
        }

        return DefWindowProc(hwnd, msg, wParam, lParam);
}
#endif


/*
 *  SheepShaver glue
 */

#ifdef SHEEPSHAVER
// Color depth modes type
typedef int video_depth;

// 1, 2, 4 and 8 bit depths use a color palette
static inline bool IsDirectMode(VIDEO_MODE const & mode)
{
        return IsDirectMode(mode.viAppleMode);
}

// Abstract base class representing one (possibly virtual) monitor
// ("monitor" = rectangular display with a contiguous frame buffer)
class monitor_desc {
public:
        monitor_desc(const vector<VIDEO_MODE> &available_modes, video_depth default_depth, uint32 default_id) {}
        virtual ~monitor_desc() {}

        // Get current Mac frame buffer base address
        uint32 get_mac_frame_base(void) const {return screen_base;}

        // Set Mac frame buffer base address (called from switch_to_mode())
        void set_mac_frame_base(uint32 base) {screen_base = base;}

        // Get current video mode
        const VIDEO_MODE &get_current_mode(void) const {return VModes[cur_mode];}

        // Called by the video driver to switch the video mode on this display
        // (must call set_mac_frame_base())
        virtual void switch_to_current_mode(void) = 0;

        // Called by the video driver to set the color palette (in indexed modes)
        // or the gamma table (in direct modes)
        virtual void set_palette(uint8 *pal, int num) = 0;
};

// Vector of pointers to available monitor descriptions, filled by VideoInit()
static vector<monitor_desc *> VideoMonitors;

// Find Apple mode matching best specified dimensions
static int find_apple_resolution(int xsize, int ysize)
{
        if (xsize == 640 && ysize == 480)
                return APPLE_640x480;
        if (xsize == 800 && ysize == 600)
                return APPLE_800x600;
        if (xsize == 1024 && ysize == 768)
                return APPLE_1024x768;
        if (xsize == 1152 && ysize == 768)
                return APPLE_1152x768;
        if (xsize == 1152 && ysize == 900)
                return APPLE_1152x900;
        if (xsize == 1280 && ysize == 1024)
                return APPLE_1280x1024;
        if (xsize == 1600 && ysize == 1200)
                return APPLE_1600x1200;
        return APPLE_CUSTOM;
}

// Display error alert
static void ErrorAlert(int error)
{
        ErrorAlert(GetString(error));
}

// Display warning alert
static void WarningAlert(int warning)
{
        WarningAlert(GetString(warning));
}
#endif


/*
 *  monitor_desc subclass for SDL display
 */

class SDL_monitor_desc : public monitor_desc {
public:
        SDL_monitor_desc(const vector<VIDEO_MODE> &available_modes, video_depth default_depth, uint32 default_id) : monitor_desc(available_modes, default_depth, default_id) {}
        ~SDL_monitor_desc() {}

        virtual void switch_to_current_mode(void);
        virtual void set_palette(uint8 *pal, int num);

        bool video_open(void);
        void video_close(void);
};


/*
 *  Utility functions
 */

// Find palette size for given color depth
static int palette_size(int mode)
{
        switch (mode) {
        case VIDEO_DEPTH_1BIT: return 2;
        case VIDEO_DEPTH_2BIT: return 4;
        case VIDEO_DEPTH_4BIT: return 16;
        case VIDEO_DEPTH_8BIT: return 256;
        case VIDEO_DEPTH_16BIT: return 32;
        case VIDEO_DEPTH_32BIT: return 256;
        default: return 0;
        }
}

// Return bytes per pixel for requested depth
static inline int bytes_per_pixel(int depth)
{
        int bpp;
        switch (depth) {
        case 8:
                bpp = 1;
                break;
        case 15: case 16:
                bpp = 2;
                break;
        case 24: case 32:
                bpp = 4;
                break;
        default:
                abort();
        }
        return bpp;
}

// Map video_mode depth ID to numerical depth value
static int mac_depth_of_video_depth(int video_depth)
{
        int depth = -1;
        switch (video_depth) {
        case VIDEO_DEPTH_1BIT:
                depth = 1;
                break;
        case VIDEO_DEPTH_2BIT:
                depth = 2;
                break;
        case VIDEO_DEPTH_4BIT:
                depth = 4;
                break;
        case VIDEO_DEPTH_8BIT:
                depth = 8;
                break;
        case VIDEO_DEPTH_16BIT:
                depth = 16;
                break;
        case VIDEO_DEPTH_32BIT:
                depth = 32;
                break;
        default:
                abort();
        }
        return depth;
}

// Map video_mode depth ID to SDL screen depth
static int sdl_depth_of_video_depth(int video_depth)
{
        return (video_depth <= VIDEO_DEPTH_8BIT) ? 8 : mac_depth_of_video_depth(video_depth);
}

// Get screen dimensions
static void sdl_display_dimensions(int &width, int &height)
{
        static int max_width, max_height;
        if (max_width == 0 && max_height == 0) {
                max_width = 640 ; max_height = 480;
                SDL_Rect **modes = SDL_ListModes(NULL, SDL_FULLSCREEN | SDL_HWSURFACE);
                if (modes && modes != (SDL_Rect **)-1) {
                        // It turns out that on some implementations, and contrary to the documentation,
                        // the returned list is not sorted from largest to smallest (e.g. Windows)
                        for (int i = 0; modes[i] != NULL; i++) {
                                const int w = modes[i]->w;
                                const int h = modes[i]->h;
                                if (w > max_width && h > max_height) {
                                        max_width = w;
                                        max_height = h;
                                }
                        }
                }
        }
        width = max_width;
        height = max_height;
}

static inline int sdl_display_width(void)
{
        int width, height;
        sdl_display_dimensions(width, height);
        return width;
}

static inline int sdl_display_height(void)
{
        int width, height;
        sdl_display_dimensions(width, height);
        return height;
}

// Check wether specified mode is available
static bool has_mode(int type, int width, int height, int depth)
{
#ifdef SHEEPSHAVER
        // Filter out Classic resolutions
        if (width == 512 && height == 384)
                return false;
#endif

        // Filter out out-of-bounds resolutions
        if (width > sdl_display_width() || height > sdl_display_height())
                return false;

        // Rely on SDL capabilities
        return SDL_VideoModeOK(width, height,
                                                   sdl_depth_of_video_depth(depth),
                                                   SDL_HWSURFACE | (type == DISPLAY_SCREEN ? SDL_FULLSCREEN : 0));
}

// Add mode to list of supported modes
static void add_mode(int type, int width, int height, int resolution_id, int bytes_per_row, int depth)
{
        // Filter out unsupported modes
        if (!has_mode(type, width, height, depth))
                return;

        // Fill in VideoMode entry
        VIDEO_MODE mode;
#ifdef SHEEPSHAVER
        resolution_id = find_apple_resolution(width, height);
        mode.viType = type;
#endif
        VIDEO_MODE_X = width;
        VIDEO_MODE_Y = height;
        VIDEO_MODE_RESOLUTION = resolution_id;
        VIDEO_MODE_ROW_BYTES = bytes_per_row;
        VIDEO_MODE_DEPTH = (video_depth)depth;
        VideoModes.push_back(mode);
}

// Set Mac frame layout and base address (uses the_buffer/MacFrameBaseMac)
static void set_mac_frame_buffer(SDL_monitor_desc &monitor, int depth, bool native_byte_order)
{
#if !REAL_ADDRESSING && !DIRECT_ADDRESSING
        int layout = FLAYOUT_DIRECT;
        if (depth == VIDEO_DEPTH_16BIT)
                layout = (screen_depth == 15) ? FLAYOUT_HOST_555 : FLAYOUT_HOST_565;
        else if (depth == VIDEO_DEPTH_32BIT)
                layout = (screen_depth == 24) ? FLAYOUT_HOST_888 : FLAYOUT_DIRECT;
        if (native_byte_order)
                MacFrameLayout = layout;
        else
                MacFrameLayout = FLAYOUT_DIRECT;
        monitor.set_mac_frame_base(MacFrameBaseMac);

        // Set variables used by UAE memory banking
        const VIDEO_MODE &mode = monitor.get_current_mode();
        MacFrameBaseHost = the_buffer;
        MacFrameSize = VIDEO_MODE_ROW_BYTES * VIDEO_MODE_Y;
        InitFrameBufferMapping();
#else
        monitor.set_mac_frame_base(Host2MacAddr(the_buffer));
#endif
        D(bug("monitor.mac_frame_base = %08x\n", monitor.get_mac_frame_base()));
}

// Set window name and class
static void set_window_name(int name)
{
        const SDL_VideoInfo *vi = SDL_GetVideoInfo();
        if (vi && vi->wm_available) {
                const char *str = GetString(name);
                SDL_WM_SetCaption(str, str);
        }
}

// Set mouse grab mode
static SDL_GrabMode set_grab_mode(SDL_GrabMode mode)
{
        const SDL_VideoInfo *vi = SDL_GetVideoInfo();
        return (vi && vi->wm_available ? SDL_WM_GrabInput(mode) : SDL_GRAB_OFF);
}

// Migrate preferences items (XXX to be handled in MigratePrefs())
static void migrate_screen_prefs(void)
{
#ifdef SHEEPSHAVER
        // Look-up priorities are: "screen", "screenmodes", "windowmodes".
        if (PrefsFindString("screen"))
                return;

        uint32 window_modes = PrefsFindInt32("windowmodes");
        uint32 screen_modes = PrefsFindInt32("screenmodes");
        int width = 0, height = 0;
        if (screen_modes) {
                static const struct {
                        int id;
                        int width;
                        int height;
                }
                modes[] = {
                        {  1,    640,    480 },
                        {  2,    800,    600 },
                        {  4,   1024,    768 },
                        { 64,   1152,    768 },
                        {  8,   1152,    900 },
                        { 16,   1280,   1024 },
                        { 32,   1600,   1200 },
                        { 0, }
                };
                for (int i = 0; modes[i].id != 0; i++) {
                        if (screen_modes & modes[i].id) {
                                if (width < modes[i].width && height < modes[i].height) {
                                        width = modes[i].width;
                                        height = modes[i].height;
                                }
                        }
                }
        } else {
                if (window_modes & 1)
                        width = 640, height = 480;
                if (window_modes & 2)
                        width = 800, height = 600;
        }
        if (width && height) {
                char str[32];
                sprintf(str, "%s/%d/%d", screen_modes ? "dga" : "win", width, height);
                PrefsReplaceString("screen", str);
        }
#endif
}


/*
 *  Display "driver" classes
 */

class driver_base {
public:
        driver_base(SDL_monitor_desc &m);
        virtual ~driver_base();

        virtual void update_palette(void);
        virtual void suspend(void) {}
        virtual void resume(void) {}
        virtual void toggle_mouse_grab(void) {}
        virtual void mouse_moved(int x, int y) { ADBMouseMoved(x, y); }

        void disable_mouse_accel(void);
        void restore_mouse_accel(void);

        virtual void grab_mouse(void) {}
        virtual void ungrab_mouse(void) {}

public:
        SDL_monitor_desc &monitor; // Associated video monitor
        const VIDEO_MODE &mode;    // Video mode handled by the driver

        bool init_ok;   // Initialization succeeded (we can't use exceptions because of -fomit-frame-pointer)
        SDL_Surface *s; // The surface we draw into
};

class driver_window;
static void update_display_window_vosf(driver_window *drv);
static void update_display_dynamic(int ticker, driver_window *drv);
static void update_display_static(driver_window *drv);

class driver_window : public driver_base {
        friend void update_display_window_vosf(driver_window *drv);
        friend void update_display_dynamic(int ticker, driver_window *drv);
        friend void update_display_static(driver_window *drv);

public:
        driver_window(SDL_monitor_desc &monitor);
        ~driver_window();

        void toggle_mouse_grab(void);
        void mouse_moved(int x, int y);

        void grab_mouse(void);
        void ungrab_mouse(void);

private:
        bool mouse_grabbed;                             // Flag: mouse pointer grabbed, using relative mouse mode
        int mouse_last_x, mouse_last_y; // Last mouse position (for relative mode)
};

class driver_fullscreen : public driver_base {
public:
        driver_fullscreen(SDL_monitor_desc &monitor);
        ~driver_fullscreen();
};

static driver_base *drv = NULL; // Pointer to currently used driver object

#ifdef ENABLE_VOSF
# include "video_vosf.h"
#endif

driver_base::driver_base(SDL_monitor_desc &m)
        : monitor(m), mode(m.get_current_mode()), init_ok(false), s(NULL)
{
        the_buffer = NULL;
        the_buffer_copy = NULL;
}

driver_base::~driver_base()
{
        ungrab_mouse();
        restore_mouse_accel();

        if (s)
                SDL_FreeSurface(s);

        // the_buffer shall always be mapped through vm_acquire_framebuffer()
        if (the_buffer != VM_MAP_FAILED) {
                D(bug(" releasing the_buffer at %p (%d bytes)\n", the_buffer, the_buffer_size));
                vm_release_framebuffer(the_buffer, the_buffer_size);
                the_buffer = NULL;
        }

        // Free frame buffer(s)
        if (!use_vosf) {
                if (the_buffer_copy) {
                        free(the_buffer_copy);
                        the_buffer_copy = NULL;
                }
        }
#ifdef ENABLE_VOSF
        else {
                if (the_host_buffer) {
                        D(bug(" freeing the_host_buffer at %p\n", the_host_buffer));
                        free(the_host_buffer);
                        the_host_buffer = NULL;
                }
                if (the_buffer_copy) {
                        D(bug(" freeing the_buffer_copy at %p\n", the_buffer_copy));
                        free(the_buffer_copy);
                        the_buffer_copy = NULL;
                }

                // Deinitialize VOSF
                video_vosf_exit();
        }
#endif
}

// Palette has changed
void driver_base::update_palette(void)
{
        const VIDEO_MODE &mode = monitor.get_current_mode();

        if ((int)VIDEO_MODE_DEPTH <= VIDEO_DEPTH_8BIT)
                SDL_SetPalette(s, SDL_PHYSPAL, sdl_palette, 0, 256);
}

// Disable mouse acceleration
void driver_base::disable_mouse_accel(void)
{
}

// Restore mouse acceleration to original value
void driver_base::restore_mouse_accel(void)
{
}


/*
 *  Windowed display driver
 */

static bool SDL_display_opened = false;

// Open display
driver_window::driver_window(SDL_monitor_desc &m)
        : driver_base(m), mouse_grabbed(false)
{
        int width = VIDEO_MODE_X, height = VIDEO_MODE_Y;
        int aligned_width = (width + 15) & ~15;
        int aligned_height = (height + 15) & ~15;

        // Set absolute mouse mode
        ADBSetRelMouseMode(mouse_grabbed);

        // This is ugly:
        // If we're switching resolutions (ie, not setting it for the first time),
        // there's a bug in SDL where the SDL_Surface created will not be properly
        // setup. The solution is to SDL_QuitSubSystem(SDL_INIT_VIDEO) before calling
        // SDL_SetVideoMode for the second time (SDL_SetVideoMode will call SDL_Init()
        // and all will be well). Without this, the video becomes corrupted (at least
        // on Mac OS X), after the resolution switch.
        if (SDL_display_opened)
                SDL_QuitSubSystem(SDL_INIT_VIDEO);

        // Create surface
        int depth = sdl_depth_of_video_depth(VIDEO_MODE_DEPTH);
        if ((s = SDL_SetVideoMode(width, height, depth, SDL_HWSURFACE)) == NULL)
                return;

        SDL_display_opened = true;

#ifdef ENABLE_VOSF
        use_vosf = true;
        // Allocate memory for frame buffer (SIZE is extended to page-boundary)
        the_host_buffer = (uint8 *)s->pixels;
        the_buffer_size = page_extend((aligned_height + 2) * s->pitch);
        the_buffer = (uint8 *)vm_acquire_framebuffer(the_buffer_size);
        the_buffer_copy = (uint8 *)malloc(the_buffer_size);
        D(bug("the_buffer = %p, the_buffer_copy = %p, the_host_buffer = %p\n", the_buffer, the_buffer_copy, the_host_buffer));

        // Check whether we can initialize the VOSF subsystem and it's profitable
        if (!video_vosf_init(m)) {
                WarningAlert(STR_VOSF_INIT_ERR);
                use_vosf = false;
        }
        else if (!video_vosf_profitable()) {
                video_vosf_exit();
                printf("VOSF acceleration is not profitable on this platform, disabling it\n");
                use_vosf = false;
        }
        if (!use_vosf) {
                free(the_buffer_copy);
                vm_release(the_buffer, the_buffer_size);
                the_host_buffer = NULL;
        }
#endif
        if (!use_vosf) {
                // Allocate memory for frame buffer
                the_buffer_size = (aligned_height + 2) * s->pitch;
                the_buffer_copy = (uint8 *)calloc(1, the_buffer_size);
                the_buffer = (uint8 *)vm_acquire_framebuffer(the_buffer_size);
                D(bug("the_buffer = %p, the_buffer_copy = %p\n", the_buffer, the_buffer_copy));
        }
        
#ifdef SHEEPSHAVER
        // Create cursor
        if ((sdl_cursor = SDL_CreateCursor(MacCursor + 4, MacCursor + 36, 16, 16, 0, 0)) != NULL) {
                SDL_SetCursor(sdl_cursor);
                cursor_changed = false;
        }
#else
        // Hide cursor
        SDL_ShowCursor(0);
#endif

        // Set window name/class
        set_window_name(STR_WINDOW_TITLE);

        // Init blitting routines
        SDL_PixelFormat *f = s->format;
        VisualFormat visualFormat;
        visualFormat.depth = depth;
        visualFormat.Rmask = f->Rmask;
        visualFormat.Gmask = f->Gmask;
        visualFormat.Bmask = f->Bmask;
        Screen_blitter_init(visualFormat, true, mac_depth_of_video_depth(VIDEO_MODE_DEPTH));

        // Load gray ramp to 8->16/32 expand map
        if (!IsDirectMode(mode))
                for (int i=0; i<256; i++)
                        ExpandMap[i] = SDL_MapRGB(f, i, i, i);

        // Set frame buffer base
        set_mac_frame_buffer(monitor, VIDEO_MODE_DEPTH, true);

        // Everything went well
        init_ok = true;
}

// Close display
driver_window::~driver_window()
{
#ifdef ENABLE_VOSF
        if (use_vosf)
                the_host_buffer = NULL; // don't free() in driver_base dtor
#endif
        if (s)
                SDL_FreeSurface(s);
}

// Toggle mouse grab
void driver_window::toggle_mouse_grab(void)
{
        if (mouse_grabbed)
                ungrab_mouse();
        else
                grab_mouse();
}

// Grab mouse, switch to relative mouse mode
void driver_window::grab_mouse(void)
{
        if (!mouse_grabbed) {
                SDL_GrabMode new_mode = set_grab_mode(SDL_GRAB_ON);
                if (new_mode == SDL_GRAB_ON) {
                        set_window_name(STR_WINDOW_TITLE_GRABBED);
                        disable_mouse_accel();
                        mouse_grabbed = true;
                }
        }
}

// Ungrab mouse, switch to absolute mouse mode
void driver_window::ungrab_mouse(void)
{
        if (mouse_grabbed) {
                SDL_GrabMode new_mode = set_grab_mode(SDL_GRAB_OFF);
                if (new_mode == SDL_GRAB_OFF) {
                        set_window_name(STR_WINDOW_TITLE);
                        restore_mouse_accel();
                        mouse_grabbed = false;
                }
        }
}

// Mouse moved
void driver_window::mouse_moved(int x, int y)
{
        mouse_last_x = x; mouse_last_y = y;
        ADBMouseMoved(x, y);
}


/*
 *  Full-screen display driver
 */

// Open display
driver_fullscreen::driver_fullscreen(SDL_monitor_desc &m)
        : driver_base(m)
{
        int width = VIDEO_MODE_X, height = VIDEO_MODE_Y;
        int aligned_width = (width + 15) & ~15;
        int aligned_height = (height + 15) & ~15;

        // Set absolute mouse mode
        ADBSetRelMouseMode(false);

        // Create surface
        int depth = sdl_depth_of_video_depth(VIDEO_MODE_DEPTH);
        if ((s = SDL_SetVideoMode(width, height, depth, SDL_HWSURFACE | SDL_FULLSCREEN)) == NULL)
                return;

#ifdef ENABLE_VOSF
        use_vosf = true;
        // Allocate memory for frame buffer (SIZE is extended to page-boundary)
        the_host_buffer = (uint8 *)s->pixels;
        the_buffer_size = page_extend((aligned_height + 2) * s->pitch);
        the_buffer = (uint8 *)vm_acquire_framebuffer(the_buffer_size);
        the_buffer_copy = (uint8 *)malloc(the_buffer_size);
        D(bug("the_buffer = %p, the_buffer_copy = %p, the_host_buffer = %p\n", the_buffer, the_buffer_copy, the_host_buffer));

        // Check whether we can initialize the VOSF subsystem and it's profitable
        if (!video_vosf_init(m)) {
                WarningAlert(STR_VOSF_INIT_ERR);
                use_vosf = false;
        }
        else if (!video_vosf_profitable()) {
                video_vosf_exit();
                printf("VOSF acceleration is not profitable on this platform, disabling it\n");
                use_vosf = false;
        }
        if (!use_vosf) {
                free(the_buffer_copy);
                vm_release(the_buffer, the_buffer_size);
                the_host_buffer = NULL;
        }
#endif
        if (!use_vosf) {
                // Allocate memory for frame buffer
                the_buffer_size = (aligned_height + 2) * s->pitch;
                the_buffer_copy = (uint8 *)calloc(1, the_buffer_size);
                the_buffer = (uint8 *)vm_acquire_framebuffer(the_buffer_size);
                D(bug("the_buffer = %p, the_buffer_copy = %p\n", the_buffer, the_buffer_copy));
        }
        
        // Hide cursor
        SDL_ShowCursor(0);

        // Init blitting routines
        SDL_PixelFormat *f = s->format;
        VisualFormat visualFormat;
        visualFormat.depth = depth;
        visualFormat.Rmask = f->Rmask;
        visualFormat.Gmask = f->Gmask;
        visualFormat.Bmask = f->Bmask;
        Screen_blitter_init(visualFormat, true, mac_depth_of_video_depth(VIDEO_MODE_DEPTH));

        // Load gray ramp to 8->16/32 expand map
        if (!IsDirectMode(mode))
                for (int i=0; i<256; i++)
                        ExpandMap[i] = SDL_MapRGB(f, i, i, i);

        // Set frame buffer base
        set_mac_frame_buffer(monitor, VIDEO_MODE_DEPTH, true);

        // Everything went well
        init_ok = true;
}

// Close display
driver_fullscreen::~driver_fullscreen()
{
#ifdef ENABLE_VOSF
        if (use_vosf)
                the_host_buffer = NULL; // don't free() in driver_base dtor
#endif
        if (s)
                SDL_FreeSurface(s);

        // Show cursor
        SDL_ShowCursor(1);
}


/*
 *  Initialization
 */

// Init keycode translation table
static void keycode_init(void)
{
        bool use_kc = PrefsFindBool("keycodes");
        if (use_kc) {

                // Get keycode file path from preferences
                const char *kc_path = PrefsFindString("keycodefile");

                // Open keycode table
                FILE *f = fopen(kc_path ? kc_path : KEYCODE_FILE_NAME, "r");
                if (f == NULL) {
                        char str[256];
                        sprintf(str, GetString(STR_KEYCODE_FILE_WARN), kc_path ? kc_path : KEYCODE_FILE_NAME, strerror(errno));
                        WarningAlert(str);
                        return;
                }

                // Default translation table
                for (int i=0; i<256; i++)
                        keycode_table[i] = -1;

                // Search for server vendor string, then read keycodes
                char video_driver[256];
                SDL_VideoDriverName(video_driver, sizeof(video_driver));
                bool video_driver_found = false;
                char line[256];
                int n_keys = 0;
                while (fgets(line, sizeof(line) - 1, f)) {
                        // Read line
                        int len = strlen(line);
                        if (len == 0)
                                continue;
                        line[len-1] = 0;

                        // Comments begin with "#" or ";"
                        if (line[0] == '#' || line[0] == ';' || line[0] == 0)
                                continue;

                        if (video_driver_found) {
                                // Skip aliases as long as we have read keycodes yet
                                // Otherwise, it's another mapping and we have to stop
                                static const char sdl_str[] = "sdl";
                                if (strncmp(line, sdl_str, sizeof(sdl_str) - 1) == 0 && n_keys == 0)
                                        continue;

                                // Read keycode
                                int x_code, mac_code;
                                if (sscanf(line, "%d %d", &x_code, &mac_code) == 2)
                                        keycode_table[x_code & 0xff] = mac_code, n_keys++;
                                else
                                        break;
                        } else {
                                // Search for SDL video driver string
                                static const char sdl_str[] = "sdl";
                                if (strncmp(line, sdl_str, sizeof(sdl_str) - 1) == 0) {
                                        char *p = line + sizeof(sdl_str);
                                        if (strstr(video_driver, p) == video_driver)
                                                video_driver_found = true;
                                }
                        }
                }

                // Keycode file completely read
                fclose(f);
                use_keycodes = video_driver_found;

                // Vendor not found? Then display warning
                if (!video_driver_found) {
                        char str[256];
                        sprintf(str, GetString(STR_KEYCODE_VENDOR_WARN), video_driver, kc_path ? kc_path : KEYCODE_FILE_NAME);
                        WarningAlert(str);
                        return;
                }

                D(bug("Using SDL/%s keycodes table, %d key mappings\n", video_driver, n_keys));
        }
}

// Open display for current mode
bool SDL_monitor_desc::video_open(void)
{
        D(bug("video_open()\n"));
        const VIDEO_MODE &mode = get_current_mode();
#if DEBUG
        D(bug("Current video mode:\n"));
        D(bug(" %dx%d (ID %02x), %d bpp\n", VIDEO_MODE_X, VIDEO_MODE_Y, VIDEO_MODE_RESOLUTION, 1 << (VIDEO_MODE_DEPTH & 0x0f)));
#endif

        // Create display driver object of requested type
        switch (display_type) {
        case DISPLAY_WINDOW:
                drv = new(std::nothrow) driver_window(*this);
                break;
        case DISPLAY_SCREEN:
                drv = new(std::nothrow) driver_fullscreen(*this);
                break;
        }
        if (drv == NULL)
                return false;
        if (!drv->init_ok) {
                delete drv;
                drv = NULL;
                return false;
        }

#ifdef WIN32
        // Chain in a new message handler for WM_DEVICECHANGE
        HWND the_window = GetMainWindowHandle();
        sdl_window_proc = (WNDPROC)GetWindowLongPtr(the_window, GWLP_WNDPROC);
        SetWindowLongPtr(the_window, GWLP_WNDPROC, (LONG_PTR)windows_message_handler);
#endif

        // Initialize VideoRefresh function
        VideoRefreshInit();

        // Lock down frame buffer
        LOCK_FRAME_BUFFER;

        // Start redraw/input thread
#ifndef USE_CPU_EMUL_SERVICES
        redraw_thread_cancel = false;
        redraw_thread_active = ((redraw_thread = SDL_CreateThread(redraw_func, NULL)) != NULL);
        if (!redraw_thread_active) {
                printf("FATAL: cannot create redraw thread\n");
                return false;
        }
#else
        redraw_thread_active = true;
#endif
        return true;
}

#ifdef SHEEPSHAVER
bool VideoInit(void)
{
        const bool classic = false;
#else
bool VideoInit(bool classic)
{
#endif
        classic_mode = classic;

#ifdef ENABLE_VOSF
        // Zero the mainBuffer structure
        mainBuffer.dirtyPages = NULL;
        mainBuffer.pageInfo = NULL;
#endif

        // Create Mutexes
        if ((sdl_events_lock = SDL_CreateMutex()) == NULL)
                return false;
        if ((sdl_palette_lock = SDL_CreateMutex()) == NULL)
                return false;
        if ((frame_buffer_lock = SDL_CreateMutex()) == NULL)
                return false;

        // Init keycode translation
        keycode_init();

        // Read prefs
        frame_skip = PrefsFindInt32("frameskip");
        mouse_wheel_mode = PrefsFindInt32("mousewheelmode");
        mouse_wheel_lines = PrefsFindInt32("mousewheellines");

        // Get screen mode from preferences
        migrate_screen_prefs();
        const char *mode_str = NULL;
        if (classic_mode)
                mode_str = "win/512/342";
        else
                mode_str = PrefsFindString("screen");

        // Determine display type and default dimensions
        int default_width, default_height;
        if (classic) {
                default_width = 512;
                default_height = 384;
        }
        else {
                default_width = 640;
                default_height = 480;
        }
        display_type = DISPLAY_WINDOW;
        if (mode_str) {
                if (sscanf(mode_str, "win/%d/%d", &default_width, &default_height) == 2)
                        display_type = DISPLAY_WINDOW;
                else if (sscanf(mode_str, "dga/%d/%d", &default_width, &default_height) == 2)
                        display_type = DISPLAY_SCREEN;
        }
        if (default_width <= 0)
                default_width = sdl_display_width();
        else if (default_width > sdl_display_width())
                default_width = sdl_display_width();
        if (default_height <= 0)
                default_height = sdl_display_height();
        else if (default_height > sdl_display_height())
                default_height = sdl_display_height();

        // Mac screen depth follows X depth
        screen_depth = SDL_GetVideoInfo()->vfmt->BitsPerPixel;
        int default_depth;
        switch (screen_depth) {
        case 8:
                default_depth = VIDEO_DEPTH_8BIT;
                break;
        case 15: case 16:
                default_depth = VIDEO_DEPTH_16BIT;
                break;
        case 24: case 32:
                default_depth = VIDEO_DEPTH_32BIT;
                break;
        default:
                default_depth =  VIDEO_DEPTH_1BIT;
                break;
        }

        // Initialize list of video modes to try
        struct {
                int w;
                int h;
                int resolution_id;
        }
        video_modes[] = {
                {   -1,   -1, 0x80 },
                {  512,  384, 0x80 },
                {  640,  480, 0x81 },
                {  800,  600, 0x82 },
                { 1024,  768, 0x83 },
                { 1152,  870, 0x84 },
                { 1280, 1024, 0x85 },
                { 1600, 1200, 0x86 },
                { 0, }
        };
        video_modes[0].w = default_width;
        video_modes[0].h = default_height;

        // Construct list of supported modes
        if (display_type == DISPLAY_WINDOW) {
                if (classic)
                        add_mode(display_type, 512, 342, 0x80, 64, VIDEO_DEPTH_1BIT);
                else {
                        for (int i = 0; video_modes[i].w != 0; i++) {
                                const int w = video_modes[i].w;
                                const int h = video_modes[i].h;
                                if (i > 0 && (w >= default_width || h >= default_height))
                                        continue;
                                for (int d = VIDEO_DEPTH_1BIT; d <= default_depth; d++)
                                        add_mode(display_type, w, h, video_modes[i].resolution_id, TrivialBytesPerRow(w, (video_depth)d), d);
                        }
                }
        } else if (display_type == DISPLAY_SCREEN) {
                for (int i = 0; video_modes[i].w != 0; i++) {
                        const int w = video_modes[i].w;
                        const int h = video_modes[i].h;
                        if (i > 0 && (w >= default_width || h >= default_height))
                                continue;
                        if (w == 512 && h == 384)
                                continue;
#ifdef ENABLE_VOSF
                        for (int d = VIDEO_DEPTH_1BIT; d <= default_depth; d++)
                                add_mode(display_type, w, h, video_modes[i].resolution_id, TrivialBytesPerRow(w, (video_depth)d), d);
#else
                        add_mode(display_type, w, h, video_modes[i].resolution_id, TrivialBytesPerRow(w, (video_depth)default_depth), default_depth);
#endif
                }
        }

        if (VideoModes.empty()) {
                ErrorAlert(STR_NO_XVISUAL_ERR);
                return false;
        }

        // Find requested default mode with specified dimensions
        uint32 default_id;
        std::vector<VIDEO_MODE>::const_iterator i, end = VideoModes.end();
        for (i = VideoModes.begin(); i != end; ++i) {
                const VIDEO_MODE & mode = (*i);
                if (VIDEO_MODE_X == default_width && VIDEO_MODE_Y == default_height && VIDEO_MODE_DEPTH == default_depth) {
                        default_id = VIDEO_MODE_RESOLUTION;
#ifdef SHEEPSHAVER
                        std::vector<VIDEO_MODE>::const_iterator begin = VideoModes.begin();
                        cur_mode = distance(begin, i);
#endif
                        break;
                }
        }
        if (i == end) { // not found, use first available mode
                const VIDEO_MODE & mode = VideoModes[0];
                default_depth = VIDEO_MODE_DEPTH;
                default_id = VIDEO_MODE_RESOLUTION;
#ifdef SHEEPSHAVER
                cur_mode = 0;
#endif
        }

#ifdef SHEEPSHAVER
        for (int i = 0; i < VideoModes.size(); i++)
                VModes[i] = VideoModes[i];
        VideoInfo *p = &VModes[VideoModes.size()];
        p->viType = DIS_INVALID;        // End marker
        p->viRowBytes = 0;
        p->viXsize = p->viYsize = 0;
        p->viAppleMode = 0;
        p->viAppleID = 0;
#endif

#if DEBUG
        D(bug("Available video modes:\n"));
        for (i = VideoModes.begin(); i != end; ++i) {
                const VIDEO_MODE & mode = (*i);
                int bits = 1 << VIDEO_MODE_DEPTH;
                if (bits == 16)
                        bits = 15;
                else if (bits == 32)
                        bits = 24;
                D(bug(" %dx%d (ID %02x), %d colors\n", VIDEO_MODE_X, VIDEO_MODE_Y, VIDEO_MODE_RESOLUTION, 1 << bits));
        }
#endif

        // Create SDL_monitor_desc for this (the only) display
        SDL_monitor_desc *monitor = new SDL_monitor_desc(VideoModes, (video_depth)default_depth, default_id);
        VideoMonitors.push_back(monitor);

        // Open display
        return monitor->video_open();
}


/*
 *  Deinitialization
 */

// Close display
void SDL_monitor_desc::video_close(void)
{
        D(bug("video_close()\n"));

#ifdef WIN32
        // Remove message handler for WM_DEVICECHANGE
        HWND the_window = GetMainWindowHandle();
        SetWindowLongPtr(the_window, GWLP_WNDPROC, (LONG_PTR)sdl_window_proc);
#endif

        // Stop redraw thread
#ifndef USE_CPU_EMUL_SERVICES
        if (redraw_thread_active) {
                redraw_thread_cancel = true;
                SDL_WaitThread(redraw_thread, NULL);
        }
#endif
        redraw_thread_active = false;

        // Unlock frame buffer
        UNLOCK_FRAME_BUFFER;
        D(bug(" frame buffer unlocked\n"));

        // Close display
        delete drv;
        drv = NULL;
}

void VideoExit(void)
{
        // Close displays
        vector<monitor_desc *>::iterator i, end = VideoMonitors.end();
        for (i = VideoMonitors.begin(); i != end; ++i)
                dynamic_cast<SDL_monitor_desc *>(*i)->video_close();

        // Destroy locks
        if (frame_buffer_lock)
                SDL_DestroyMutex(frame_buffer_lock);
        if (sdl_palette_lock)
                SDL_DestroyMutex(sdl_palette_lock);
        if (sdl_events_lock)
                SDL_DestroyMutex(sdl_events_lock);
}


/*
 *  Close down full-screen mode (if bringing up error alerts is unsafe while in full-screen mode)
 */

void VideoQuitFullScreen(void)
{
        D(bug("VideoQuitFullScreen()\n"));
        quit_full_screen = true;
}


/*
 *  Mac VBL interrupt
 */

/*
 *  Execute video VBL routine
 */

#ifdef SHEEPSHAVER
void VideoVBL(void)
{
        // Emergency quit requested? Then quit
        if (emerg_quit)
                QuitEmulator();

        // Temporarily give up frame buffer lock (this is the point where
        // we are suspended when the user presses Ctrl-Tab)
        UNLOCK_FRAME_BUFFER;
        LOCK_FRAME_BUFFER;

        // Execute video VBL
        if (private_data != NULL && private_data->interruptsEnabled)
                VSLDoInterruptService(private_data->vslServiceID);
}
#else
void VideoInterrupt(void)
{
        // We must fill in the events queue in the same thread that did call SDL_SetVideoMode()
        SDL_PumpEvents();

        // Emergency quit requested? Then quit
        if (emerg_quit)
                QuitEmulator();

        // Temporarily give up frame buffer lock (this is the point where
        // we are suspended when the user presses Ctrl-Tab)
        UNLOCK_FRAME_BUFFER;
        LOCK_FRAME_BUFFER;
}
#endif


/*
 *  Set palette
 */

#ifdef SHEEPSHAVER
void video_set_palette(void)
{
        monitor_desc * monitor = VideoMonitors[0];
        int n_colors = palette_size(monitor->get_current_mode().viAppleMode);
        uint8 pal[256 * 3];
        for (int c = 0; c < n_colors; c++) {
                pal[c*3 + 0] = mac_pal[c].red;
                pal[c*3 + 1] = mac_pal[c].green;
                pal[c*3 + 2] = mac_pal[c].blue;
        }
        monitor->set_palette(pal, n_colors);
}
#endif

void SDL_monitor_desc::set_palette(uint8 *pal, int num_in)
{
        const VIDEO_MODE &mode = get_current_mode();

        // FIXME: how can we handle the gamma ramp?
        if ((int)VIDEO_MODE_DEPTH > VIDEO_DEPTH_8BIT)
                return;

        LOCK_PALETTE;

        // Convert colors to XColor array
        int num_out = 256;
        bool stretch = false;
        SDL_Color *p = sdl_palette;
        for (int i=0; i<num_out; i++) {
                int c = (stretch ? (i * num_in) / num_out : i);
                p->r = pal[c*3 + 0] * 0x0101;
                p->g = pal[c*3 + 1] * 0x0101;
                p->b = pal[c*3 + 2] * 0x0101;
                p++;
        }

        // Recalculate pixel color expansion map
        if (!IsDirectMode(mode)) {
                for (int i=0; i<256; i++) {
                        int c = i & (num_in-1); // If there are less than 256 colors, we repeat the first entries (this makes color expansion easier)
                        ExpandMap[i] = SDL_MapRGB(drv->s->format, pal[c*3+0], pal[c*3+1], pal[c*3+2]);
                }

#ifdef ENABLE_VOSF
                if (use_vosf) {
                        // We have to redraw everything because the interpretation of pixel values changed
                        LOCK_VOSF;
                        PFLAG_SET_ALL;
                        UNLOCK_VOSF;
                        memset(the_buffer_copy, 0, VIDEO_MODE_ROW_BYTES * VIDEO_MODE_Y);
                }
#endif
        }

        // Tell redraw thread to change palette
        sdl_palette_changed = true;

        UNLOCK_PALETTE;
}


/*
 *  Switch video mode
 */

#ifdef SHEEPSHAVER
int16 video_mode_change(VidLocals *csSave, uint32 ParamPtr)
{
        /* return if no mode change */
        if ((csSave->saveData == ReadMacInt32(ParamPtr + csData)) &&
            (csSave->saveMode == ReadMacInt16(ParamPtr + csMode))) return noErr;

        /* first find video mode in table */
        for (int i=0; VModes[i].viType != DIS_INVALID; i++) {
                if ((ReadMacInt16(ParamPtr + csMode) == VModes[i].viAppleMode) &&
                    (ReadMacInt32(ParamPtr + csData) == VModes[i].viAppleID)) {
                        csSave->saveMode = ReadMacInt16(ParamPtr + csMode);
                        csSave->saveData = ReadMacInt32(ParamPtr + csData);
                        csSave->savePage = ReadMacInt16(ParamPtr + csPage);

                        // Disable interrupts and pause redraw thread
                        DisableInterrupt();
                        thread_stop_ack = false;
                        thread_stop_req = true;
                        while (!thread_stop_ack) ;

                        cur_mode = i;
                        monitor_desc *monitor = VideoMonitors[0];
                        monitor->switch_to_current_mode();

                        WriteMacInt32(ParamPtr + csBaseAddr, screen_base);
                        csSave->saveBaseAddr=screen_base;
                        csSave->saveData=VModes[cur_mode].viAppleID;/* First mode ... */
                        csSave->saveMode=VModes[cur_mode].viAppleMode;

                        // Enable interrupts and resume redraw thread
                        thread_stop_req = false;
                        EnableInterrupt();
                        return noErr;
                }
        }
        return paramErr;
}
#endif

void SDL_monitor_desc::switch_to_current_mode(void)
{
        // Close and reopen display
        LOCK_EVENTS;
        video_close();
        video_open();
        UNLOCK_EVENTS;

        if (drv == NULL) {
                ErrorAlert(STR_OPEN_WINDOW_ERR);
                QuitEmulator();
        }
}


/*
 *  Can we set the MacOS cursor image into the window?
 */

#ifdef SHEEPSHAVER
bool video_can_change_cursor(void)
{
        return (display_type == DISPLAY_WINDOW);
}
#endif


/*
 *  Set cursor image for window
 */

#ifdef SHEEPSHAVER
void video_set_cursor(void)
{
        cursor_changed = true;
}
#endif


/*
 *  Keyboard-related utilify functions
 */

static bool is_modifier_key(SDL_KeyboardEvent const & e)
{
        switch (e.keysym.sym) {
        case SDLK_NUMLOCK:
        case SDLK_CAPSLOCK:
        case SDLK_SCROLLOCK:
        case SDLK_RSHIFT:
        case SDLK_LSHIFT:
        case SDLK_RCTRL:
        case SDLK_LCTRL:
        case SDLK_RALT:
        case SDLK_LALT:
        case SDLK_RMETA:
        case SDLK_LMETA:
        case SDLK_LSUPER:
        case SDLK_RSUPER:
        case SDLK_MODE:
        case SDLK_COMPOSE:
                return true;
        }
        return false;
}

static bool is_ctrl_down(SDL_keysym const & ks)
{
        return ctrl_down || (ks.mod & KMOD_CTRL);
}


/*
 *  Translate key event to Mac keycode, returns -1 if no keycode was found
 *  and -2 if the key was recognized as a hotkey
 */

static int kc_decode(SDL_keysym const & ks, bool key_down)
{
        switch (ks.sym) {
        case SDLK_a: return 0x00;
        case SDLK_b: return 0x0b;
        case SDLK_c: return 0x08;
        case SDLK_d: return 0x02;
        case SDLK_e: return 0x0e;
        case SDLK_f: return 0x03;
        case SDLK_g: return 0x05;
        case SDLK_h: return 0x04;
        case SDLK_i: return 0x22;
        case SDLK_j: return 0x26;
        case SDLK_k: return 0x28;
        case SDLK_l: return 0x25;
        case SDLK_m: return 0x2e;
        case SDLK_n: return 0x2d;
        case SDLK_o: return 0x1f;
        case SDLK_p: return 0x23;
        case SDLK_q: return 0x0c;
        case SDLK_r: return 0x0f;
        case SDLK_s: return 0x01;
        case SDLK_t: return 0x11;
        case SDLK_u: return 0x20;
        case SDLK_v: return 0x09;
        case SDLK_w: return 0x0d;
        case SDLK_x: return 0x07;
        case SDLK_y: return 0x10;
        case SDLK_z: return 0x06;

        case SDLK_1: case SDLK_EXCLAIM: return 0x12;
        case SDLK_2: case SDLK_AT: return 0x13;
        case SDLK_3: case SDLK_HASH: return 0x14;
        case SDLK_4: case SDLK_DOLLAR: return 0x15;
        case SDLK_5: return 0x17;
        case SDLK_6: return 0x16;
        case SDLK_7: return 0x1a;
        case SDLK_8: return 0x1c;
        case SDLK_9: return 0x19;
        case SDLK_0: return 0x1d;

        case SDLK_BACKQUOTE: return 0x0a;
        case SDLK_MINUS: case SDLK_UNDERSCORE: return 0x1b;
        case SDLK_EQUALS: case SDLK_PLUS: return 0x18;
        case SDLK_LEFTBRACKET: return 0x21;
        case SDLK_RIGHTBRACKET: return 0x1e;
        case SDLK_BACKSLASH: return 0x2a;
        case SDLK_SEMICOLON: case SDLK_COLON: return 0x29;
        case SDLK_QUOTE: case SDLK_QUOTEDBL: return 0x27;
        case SDLK_COMMA: case SDLK_LESS: return 0x2b;
        case SDLK_PERIOD: case SDLK_GREATER: return 0x2f;
        case SDLK_SLASH: case SDLK_QUESTION: return 0x2c;

        case SDLK_TAB: if (is_ctrl_down(ks)) {if (!key_down) drv->suspend(); return -2;} else return 0x30;
        case SDLK_RETURN: return 0x24;
        case SDLK_SPACE: return 0x31;
        case SDLK_BACKSPACE: return 0x33;

        case SDLK_DELETE: return 0x75;
        case SDLK_INSERT: return 0x72;
        case SDLK_HOME: case SDLK_HELP: return 0x73;
        case SDLK_END: return 0x77;
        case SDLK_PAGEUP: return 0x74;
        case SDLK_PAGEDOWN: return 0x79;

        case SDLK_LCTRL: return 0x36;
        case SDLK_RCTRL: return 0x36;
        case SDLK_LSHIFT: return 0x38;
        case SDLK_RSHIFT: return 0x38;
#if (defined(__APPLE__) && defined(__MACH__))
        case SDLK_LALT: return 0x3a;
        case SDLK_RALT: return 0x3a;
        case SDLK_LMETA: return 0x37;
        case SDLK_RMETA: return 0x37;
#else
        case SDLK_LALT: return 0x37;
        case SDLK_RALT: return 0x37;
        case SDLK_LMETA: return 0x3a;
        case SDLK_RMETA: return 0x3a;
#endif
        case SDLK_LSUPER: return 0x3a; // "Windows" key
        case SDLK_RSUPER: return 0x3a;
        case SDLK_MENU: return 0x32;
        case SDLK_CAPSLOCK: return 0x39;
        case SDLK_NUMLOCK: return 0x47;

        case SDLK_UP: return 0x3e;
        case SDLK_DOWN: return 0x3d;
        case SDLK_LEFT: return 0x3b;
        case SDLK_RIGHT: return 0x3c;

        case SDLK_ESCAPE: if (is_ctrl_down(ks)) {if (!key_down) { quit_full_screen = true; emerg_quit = true; } return -2;} else return 0x35;

        case SDLK_F1: if (is_ctrl_down(ks)) {if (!key_down) SysMountFirstFloppy(); return -2;} else return 0x7a;
        case SDLK_F2: return 0x78;
        case SDLK_F3: return 0x63;
        case SDLK_F4: return 0x76;
        case SDLK_F5: if (is_ctrl_down(ks)) {if (!key_down) drv->toggle_mouse_grab(); return -2;} else return 0x60;
        case SDLK_F6: return 0x61;
        case SDLK_F7: return 0x62;
        case SDLK_F8: return 0x64;
        case SDLK_F9: return 0x65;
        case SDLK_F10: return 0x6d;
        case SDLK_F11: return 0x67;
        case SDLK_F12: return 0x6f;

        case SDLK_PRINT: return 0x69;
        case SDLK_SCROLLOCK: return 0x6b;
        case SDLK_PAUSE: return 0x71;

        case SDLK_KP0: return 0x52;
        case SDLK_KP1: return 0x53;
        case SDLK_KP2: return 0x54;
        case SDLK_KP3: return 0x55;
        case SDLK_KP4: return 0x56;
        case SDLK_KP5: return 0x57;
        case SDLK_KP6: return 0x58;
        case SDLK_KP7: return 0x59;
        case SDLK_KP8: return 0x5b;
        case SDLK_KP9: return 0x5c;
        case SDLK_KP_PERIOD: return 0x41;
        case SDLK_KP_PLUS: return 0x45;
        case SDLK_KP_MINUS: return 0x4e;
        case SDLK_KP_MULTIPLY: return 0x43;
        case SDLK_KP_DIVIDE: return 0x4b;
        case SDLK_KP_ENTER: return 0x4c;
        case SDLK_KP_EQUALS: return 0x51;
        }
        D(bug("Unhandled SDL keysym: %d\n", ks.sym));
        return -1;
}

static int event2keycode(SDL_KeyboardEvent const &ev, bool key_down)
{
        return kc_decode(ev.keysym, key_down);
}


/*
 *  SDL event handling
 */

static void handle_events(void)
{
        SDL_Event events[10];
        const int n_max_events = sizeof(events) / sizeof(events[0]);
        int n_events;

        while ((n_events = SDL_PeepEvents(events, n_max_events, SDL_GETEVENT, sdl_eventmask)) > 0) {
                for (int i = 0; i < n_events; i++) {
                        SDL_Event const & event = events[i];
                        switch (event.type) {

                        // Mouse button
                        case SDL_MOUSEBUTTONDOWN: {
                                unsigned int button = event.button.button;
                                if (button < 4)
                                        ADBMouseDown(button - 1);
                                else if (button < 6) {  // Wheel mouse
                                        if (mouse_wheel_mode == 0) {
                                                int key = (button == 5) ? 0x79 : 0x74;  // Page up/down
                                                ADBKeyDown(key);
                                                ADBKeyUp(key);
                                        } else {
                                                int key = (button == 5) ? 0x3d : 0x3e;  // Cursor up/down
                                                for(int i=0; i<mouse_wheel_lines; i++) {
                                                        ADBKeyDown(key);
                                                        ADBKeyUp(key);
                                                }
                                        }
                                }
                                break;
                        }
                        case SDL_MOUSEBUTTONUP: {
                                unsigned int button = event.button.button;
                                if (button < 4)
                                        ADBMouseUp(button - 1);
                                break;
                        }

                        // Mouse moved
                        case SDL_MOUSEMOTION:
                                drv->mouse_moved(event.motion.x, event.motion.y);
                                break;

                        // Keyboard
                        case SDL_KEYDOWN: {
                                int code = -1;
                                if (use_keycodes && !is_modifier_key(event.key)) {
                                        if (event2keycode(event.key, true) != -2)       // This is called to process the hotkeys
                                                code = keycode_table[event.key.keysym.scancode & 0xff];
                                } else
                                        code = event2keycode(event.key, true);
                                if (code >= 0) {
                                        if (!emul_suspended) {
                                                if (code == 0x39) {     // Caps Lock pressed
                                                        if (caps_on) {
                                                                ADBKeyUp(code);
                                                                caps_on = false;
                                                        } else {
                                                                ADBKeyDown(code);
                                                                caps_on = true;
                                                        }
                                                } else
                                                        ADBKeyDown(code);
                                                if (code == 0x36)
                                                        ctrl_down = true;
                                        } else {
                                                if (code == 0x31)
                                                        drv->resume();  // Space wakes us up
                                        }
                                }
                                break;
                        }
                        case SDL_KEYUP: {
                                int code = -1;
                                if (use_keycodes && !is_modifier_key(event.key)) {
                                        if (event2keycode(event.key, false) != -2)      // This is called to process the hotkeys
                                                code = keycode_table[event.key.keysym.scancode & 0xff];
                                } else
                                        code = event2keycode(event.key, false);
                                if (code >= 0) {
                                        if (code == 0x39) {     // Caps Lock released
                                                if (caps_on) {
                                                        ADBKeyUp(code);
                                                        caps_on = false;
                                                } else {
                                                        ADBKeyDown(code);
                                                        caps_on = true;
                                                }
                                        } else
                                                ADBKeyUp(code);
                                        if (code == 0x36)
                                                ctrl_down = false;
                                }
                                break;
                        }

                        // Hidden parts exposed, force complete refresh of window
                        case SDL_VIDEOEXPOSE:
                                if (display_type == DISPLAY_WINDOW) {
                                        const VIDEO_MODE &mode = VideoMonitors[0]->get_current_mode();
#ifdef ENABLE_VOSF
                                        if (use_vosf) {                 // VOSF refresh
                                                LOCK_VOSF;
                                                PFLAG_SET_ALL;
                                                UNLOCK_VOSF;
                                                memset(the_buffer_copy, 0, VIDEO_MODE_ROW_BYTES * VIDEO_MODE_Y);
                                        }
                                        else
#endif
                                                memset(the_buffer_copy, 0, VIDEO_MODE_ROW_BYTES * VIDEO_MODE_Y);
                                }
                                break;

                        // Window "close" widget clicked
                        case SDL_QUIT:
                                ADBKeyDown(0x7f);       // Power key
                                ADBKeyUp(0x7f);
                                break;
                        }
                }
        }
}


/*
 *  Window display update
 */

// Static display update (fixed frame rate, but incremental)
static void update_display_static(driver_window *drv)
{
        // Incremental update code
        int wide = 0, high = 0, x1, x2, y1, y2, i, j;
        const VIDEO_MODE &mode = drv->mode;
        int bytes_per_row = VIDEO_MODE_ROW_BYTES;
        uint8 *p, *p2;

        // Check for first line from top and first line from bottom that have changed
        y1 = 0;
        for (j=0; j<VIDEO_MODE_Y; j++) {
                if (memcmp(&the_buffer[j * bytes_per_row], &the_buffer_copy[j * bytes_per_row], bytes_per_row)) {
                        y1 = j;
                        break;
                }
        }
        y2 = y1 - 1;
        for (j=VIDEO_MODE_Y-1; j>=y1; j--) {
                if (memcmp(&the_buffer[j * bytes_per_row], &the_buffer_copy[j * bytes_per_row], bytes_per_row)) {
                        y2 = j;
                        break;
                }
        }
        high = y2 - y1 + 1;

        // Check for first column from left and first column from right that have changed
        if (high) {
                if ((int)VIDEO_MODE_DEPTH < VIDEO_DEPTH_8BIT) {
                        const int src_bytes_per_row = bytes_per_row;
                        const int dst_bytes_per_row = drv->s->pitch;
                        const int pixels_per_byte = VIDEO_MODE_X / src_bytes_per_row;

                        x1 = VIDEO_MODE_X / pixels_per_byte;
                        for (j = y1; j <= y2; j++) {
                                p = &the_buffer[j * bytes_per_row];
                                p2 = &the_buffer_copy[j * bytes_per_row];
                                for (i = 0; i < x1; i++) {
                                        if (*p != *p2) {
                                                x1 = i;
                                                break;
                                        }
                                        p++; p2++;
                                }
                        }
                        x2 = x1;
                        for (j = y1; j <= y2; j++) {
                                p = &the_buffer[j * bytes_per_row];
                                p2 = &the_buffer_copy[j * bytes_per_row];
                                p += bytes_per_row;
                                p2 += bytes_per_row;
                                for (i = (VIDEO_MODE_X / pixels_per_byte); i > x2; i--) {
                                        p--; p2--;
                                        if (*p != *p2) {
                                                x2 = i;
                                                break;
                                        }
                                }
                        }
                        x1 *= pixels_per_byte;
                        x2 *= pixels_per_byte;
                        wide = (x2 - x1 + pixels_per_byte - 1) & -pixels_per_byte;

                        // Update copy of the_buffer
                        if (high && wide) {

                                // Lock surface, if required
                                if (SDL_MUSTLOCK(drv->s))
                                        SDL_LockSurface(drv->s);

                                // Blit to screen surface
                                int si = y1 * src_bytes_per_row + (x1 / pixels_per_byte);
                                int di = y1 * dst_bytes_per_row + x1;
                                for (j = y1; j <= y2; j++) {
                                        memcpy(the_buffer_copy + si, the_buffer + si, wide / pixels_per_byte);
                                        Screen_blit((uint8 *)drv->s->pixels + di, the_buffer + si, wide / pixels_per_byte);
                                        si += src_bytes_per_row;
                                        di += dst_bytes_per_row;
                                }

                                // Unlock surface, if required
                                if (SDL_MUSTLOCK(drv->s))
                                        SDL_UnlockSurface(drv->s);

                                // Refresh display
                                SDL_UpdateRect(drv->s, x1, y1, wide, high);
                        }

                } else {
                        const int bytes_per_pixel = VIDEO_MODE_ROW_BYTES / VIDEO_MODE_X;

                        x1 = VIDEO_MODE_X;
                        for (j=y1; j<=y2; j++) {
                                p = &the_buffer[j * bytes_per_row];
                                p2 = &the_buffer_copy[j * bytes_per_row];
                                for (i=0; i<x1*bytes_per_pixel; i++) {
                                        if (*p != *p2) {
                                                x1 = i / bytes_per_pixel;
                                                break;
                                        }
                                        p++; p2++;
                                }
                        }
                        x2 = x1;
                        for (j=y1; j<=y2; j++) {
                                p = &the_buffer[j * bytes_per_row];
                                p2 = &the_buffer_copy[j * bytes_per_row];
                                p += bytes_per_row;
                                p2 += bytes_per_row;
                                for (i=VIDEO_MODE_X*bytes_per_pixel; i>x2*bytes_per_pixel; i--) {
                                        p--;
                                        p2--;
                                        if (*p != *p2) {
                                                x2 = i / bytes_per_pixel;
                                                break;
                                        }
                                }
                        }
                        wide = x2 - x1;

                        // Update copy of the_buffer
                        if (high && wide) {

                                // Lock surface, if required
                                if (SDL_MUSTLOCK(drv->s))
                                        SDL_LockSurface(drv->s);

                                // Blit to screen surface
                                for (j=y1; j<=y2; j++) {
                                        i = j * bytes_per_row + x1 * bytes_per_pixel;
                                        memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * wide);
                                        Screen_blit((uint8 *)drv->s->pixels + i, the_buffer + i, bytes_per_pixel * wide);
                                }

                                // Unlock surface, if required
                                if (SDL_MUSTLOCK(drv->s))
                                        SDL_UnlockSurface(drv->s);

                                // Refresh display
                                SDL_UpdateRect(drv->s, x1, y1, wide, high);
                        }
                }
        }
}

// Static display update (fixed frame rate, bounding boxes based)
// XXX use NQD bounding boxes to help detect dirty areas?
static void update_display_static_bbox(driver_window *drv)
{
        const VIDEO_MODE &mode = drv->mode;

        // Allocate bounding boxes for SDL_UpdateRects()
        const int N_PIXELS = 64;
        const int n_x_boxes = (VIDEO_MODE_X + N_PIXELS - 1) / N_PIXELS;
        const int n_y_boxes = (VIDEO_MODE_Y + N_PIXELS - 1) / N_PIXELS;
        SDL_Rect *boxes = (SDL_Rect *)alloca(sizeof(SDL_Rect) * n_x_boxes * n_y_boxes);
        int nr_boxes = 0;

        // Lock surface, if required
        if (SDL_MUSTLOCK(drv->s))
                SDL_LockSurface(drv->s);

        // Update the surface from Mac screen
        const int bytes_per_row = VIDEO_MODE_ROW_BYTES;
        const int bytes_per_pixel = bytes_per_row / VIDEO_MODE_X;
        int x, y;
        for (y = 0; y < VIDEO_MODE_Y; y += N_PIXELS) {
                int h = N_PIXELS;
                if (h > VIDEO_MODE_Y - y)
                        h = VIDEO_MODE_Y - y;
                for (x = 0; x < VIDEO_MODE_X; x += N_PIXELS) {
                        int w = N_PIXELS;
                        if (w > VIDEO_MODE_X - x)
                                w = VIDEO_MODE_X - x;
                        const int xs = w * bytes_per_pixel;
                        const int xb = x * bytes_per_pixel;
                        bool dirty = false;
                        for (int j = y; j < (y + h); j++) {
                                const int yb = j * bytes_per_row;
                                if (memcmp(&the_buffer[yb + xb], &the_buffer_copy[yb + xb], xs) != 0) {
                                        memcpy(&the_buffer_copy[yb + xb], &the_buffer[yb + xb], xs);
                                        Screen_blit((uint8 *)drv->s->pixels + yb + xb, the_buffer + yb + xb, xs);
                                        dirty = true;
                                }
                        }
                        if (dirty) {
                                boxes[nr_boxes].x = x;
                                boxes[nr_boxes].y = y;
                                boxes[nr_boxes].w = w;
                                boxes[nr_boxes].h = h;
                                nr_boxes++;
                        }
                }
        }

        // Unlock surface, if required
        if (SDL_MUSTLOCK(drv->s))
                SDL_UnlockSurface(drv->s);

        // Refresh display
        if (nr_boxes)
                SDL_UpdateRects(drv->s, nr_boxes, boxes);
}


// We suggest the compiler to inline the next two functions so that it
// may specialise the code according to the current screen depth and
// display type. A clever compiler would do that job by itself though...

// NOTE: update_display_vosf is inlined too

static inline void possibly_quit_dga_mode()
{
        // Quit DGA mode if requested (something terrible has happened and we
        // want to give control back to the user)
        if (quit_full_screen) {
                quit_full_screen = false;
                delete drv;
                drv = NULL;
        }
}

static inline void possibly_ungrab_mouse()
{
        // Ungrab mouse if requested (something terrible has happened and we
        // want to give control back to the user)
        if (quit_full_screen) {
                quit_full_screen = false;
                if (drv)
                        drv->ungrab_mouse();
        }
}

static inline void handle_palette_changes(void)
{
        LOCK_PALETTE;

        if (sdl_palette_changed) {
                sdl_palette_changed = false;
                drv->update_palette();
        }

        UNLOCK_PALETTE;
}

static void video_refresh_dga(void)
{
        // Quit DGA mode if requested
        possibly_quit_dga_mode();
}

#ifdef ENABLE_VOSF
#if REAL_ADDRESSING || DIRECT_ADDRESSING
static void video_refresh_dga_vosf(void)
{
        // Quit DGA mode if requested
        possibly_quit_dga_mode();
        
        // Update display (VOSF variant)
        static int tick_counter = 0;
        if (++tick_counter >= frame_skip) {
                tick_counter = 0;
                if (mainBuffer.dirty) {
                        LOCK_VOSF;
                        update_display_dga_vosf(static_cast<driver_fullscreen *>(drv));
                        UNLOCK_VOSF;
                }
        }
}
#endif

static void video_refresh_window_vosf(void)
{
        // Ungrab mouse if requested
        possibly_ungrab_mouse();
        
        // Update display (VOSF variant)
        static int tick_counter = 0;
        if (++tick_counter >= frame_skip) {
                tick_counter = 0;
                if (mainBuffer.dirty) {
                        LOCK_VOSF;
                        update_display_window_vosf(static_cast<driver_window *>(drv));
                        UNLOCK_VOSF;
                }
        }
}
#endif // def ENABLE_VOSF

static void video_refresh_window_static(void)
{
        // Ungrab mouse if requested
        possibly_ungrab_mouse();

        // Update display (static variant)
        static int tick_counter = 0;
        if (++tick_counter >= frame_skip) {
                tick_counter = 0;
                const VIDEO_MODE &mode = drv->mode;
                if ((int)VIDEO_MODE_DEPTH >= VIDEO_DEPTH_8BIT)
                        update_display_static_bbox(static_cast<driver_window *>(drv));
                else
                        update_display_static(static_cast<driver_window *>(drv));
        }
}


/*
 *  Thread for screen refresh, input handling etc.
 */

static void VideoRefreshInit(void)
{
        // TODO: set up specialised 8bpp VideoRefresh handlers ?
        if (display_type == DISPLAY_SCREEN) {
#if ENABLE_VOSF && (REAL_ADDRESSING || DIRECT_ADDRESSING)
                if (use_vosf)
                        video_refresh = video_refresh_dga_vosf;
                else
#endif
                        video_refresh = video_refresh_dga;
        }
        else {
#ifdef ENABLE_VOSF
                if (use_vosf)
                        video_refresh = video_refresh_window_vosf;
                else
#endif
                        video_refresh = video_refresh_window_static;
        }
}

static inline void do_video_refresh(void)
{
        // Handle SDL events
        handle_events();

        // Update display
        video_refresh();

#ifdef SHEEPSHAVER
        // Set new cursor image if it was changed
        if (cursor_changed && sdl_cursor) {
                cursor_changed = false;
                LOCK_EVENTS;
                SDL_FreeCursor(sdl_cursor);
                sdl_cursor = SDL_CreateCursor(MacCursor + 4, MacCursor + 36, 16, 16, MacCursor[2], MacCursor[3]);
                if (sdl_cursor) {
                        SDL_SetCursor(sdl_cursor);
#ifdef WIN32
                        // XXX Windows apparently needs an extra mouse event to
                        // make the new cursor image visible
                        int visible = SDL_ShowCursor(-1);
                        if (visible) {
                                int x, y;
                                SDL_GetMouseState(&x, &y);
                                SDL_WarpMouse(x, y);
                        }
#endif
                }
                UNLOCK_EVENTS;
        }
#endif

        // Set new palette if it was changed
        handle_palette_changes();
}

// This function is called on non-threaded platforms from a timer interrupt
void VideoRefresh(void)
{
        // We need to check redraw_thread_active to inhibit refreshed during
        // mode changes on non-threaded platforms
        if (!redraw_thread_active)
                return;

        // Process pending events and update display
        do_video_refresh();
}

const int VIDEO_REFRESH_HZ = 60;
const int VIDEO_REFRESH_DELAY = 1000000 / VIDEO_REFRESH_HZ;

#ifndef USE_CPU_EMUL_SERVICES
static int redraw_func(void *arg)
{
        uint64 start = GetTicks_usec();
        int64 ticks = 0;
        uint64 next = GetTicks_usec() + VIDEO_REFRESH_DELAY;

        while (!redraw_thread_cancel) {

                // Wait
                next += VIDEO_REFRESH_DELAY;
                int64 delay = next - GetTicks_usec();
                if (delay > 0)
                        Delay_usec(delay);
                else if (delay < -VIDEO_REFRESH_DELAY)
                        next = GetTicks_usec();
                ticks++;

#ifdef SHEEPSHAVER
                // Pause if requested (during video mode switches)
                if (thread_stop_req) {
                        thread_stop_ack = true;
                        continue;
                }
#endif

                // Process pending events and update display
                do_video_refresh();
        }

        uint64 end = GetTicks_usec();
        D(bug("%lld refreshes in %lld usec = %f refreshes/sec\n", ticks, end - start, ticks * 1000000.0 / (end - start)));
        return 0;
}
#endif


/*
 *  Record dirty area from NQD
 */

#ifdef SHEEPSHAVER
void video_set_dirty_area(int x, int y, int w, int h)
{
        const VIDEO_MODE &mode = drv->mode;
        const int screen_width = VIDEO_MODE_X;
        const int screen_height = VIDEO_MODE_Y;
        const int bytes_per_row = VIDEO_MODE_ROW_BYTES;

#ifdef ENABLE_VOSF
        if (use_vosf) {
                vosf_set_dirty_area(x, y, w, h, screen_width, screen_height, bytes_per_row);
                return;
        }
#endif

        // XXX handle dirty bounding boxes for non-VOSF modes
}
#endif
Revision:	1.33
Committed:	2007-06-14T14:45:54Z (17 years ago) by gbeauche
Branch:	MAIN
Changes since 1.32:	+15 -3 lines
Log Message:	Workaround video mode switch problems. IOW, make sure to always allocate the frame buffer at the same base address.