src/SDL/video_sdl.cpp

/*
 *  video_sdl.cpp - Video/graphics emulation, SDL specific stuff
 *
 *  Basilisk II (C) 1997-2004 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
 *      Ctrl-Esc = emergency quit
 *      Ctrl-F1 = mount floppy
 *      Ctrl-F5 = grab mouse (in windowed mode)
 *
 *  FIXMEs and TODOs:
 *  - 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?
 *  - Fullscreen mode
 *  - 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.
 */

#include "sysdeps.h"

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

#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"

#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
const char KEYCODE_FILE_NAME[] = DATADIR "/keycodes";


// 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
static volatile bool redraw_thread_cancel;                      // Flag: Cancel Redraw thread
static SDL_Thread *redraw_thread = NULL;                        // Redraw thread

#ifdef ENABLE_VOSF
static bool use_vosf = true;                                            // 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_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 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);


/*
 *  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)
{
        int apple_id;
        if (xsize < 800)
                apple_id = APPLE_640x480;
        else if (xsize < 1024)
                apple_id = APPLE_800x600;
        else if (xsize < 1152)
                apple_id = APPLE_1024x768;
        else if (xsize < 1280) {
                if (ysize < 900)
                        apple_id = APPLE_1152x768;
                else
                        apple_id = APPLE_1152x900;
        }
        else if (xsize < 1600)
                apple_id = APPLE_1280x1024;
        else
                apple_id = APPLE_1600x1200;
        return apple_id;
}

// Set parameters to specified Apple mode
static void set_apple_resolution(int apple_id, int &xsize, int &ysize)
{
        switch (apple_id) {
        case APPLE_640x480:
                xsize = 640;
                ysize = 480;
                break;
        case APPLE_800x600:
                xsize = 800;
                ysize = 600;
                break;
        case APPLE_1024x768:
                xsize = 1024;
                ysize = 768;
                break;
        case APPLE_1152x768:
                xsize = 1152;
                ysize = 768;
                break;
        case APPLE_1152x900:
                xsize = 1152;
                ysize = 900;
                break;
        case APPLE_1280x1024:
                xsize = 1280;
                ysize = 1024;
                break;
        case APPLE_1600x1200:
                xsize = 1600;
                ysize = 1200;
                break;
        default:
                abort();
        }
}

// Match Apple mode matching best specified dimensions
static int match_apple_resolution(int &xsize, int &ysize)
{
        int apple_id = find_apple_resolution(xsize, ysize);
        set_apple_resolution(apple_id, xsize, ysize);
        return apple_id;
}

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

// Check wether specified mode is available
static bool has_mode(int type, int width, int height)
{
        // FIXME: no fullscreen support yet
        if (type == DISPLAY_SCREEN)
                return false;

#ifdef SHEEPSHAVER
        // Filter out Classic resolutiosn
        if (width == 512 && height == 384)
                return false;

        // Read window modes prefs
        static uint32 window_modes = 0;
        static uint32 screen_modes = 0;
        if (window_modes == 0 || screen_modes == 0) {
                window_modes = PrefsFindInt32("windowmodes");
                screen_modes = PrefsFindInt32("screenmodes");
                if (window_modes == 0 || screen_modes == 0)
                        window_modes |= 3;                      // Allow at least 640x480 and 800x600 window modes
        }

        if (type == DISPLAY_WINDOW) {
                int apple_mask, apple_id = find_apple_resolution(width, height);
                switch (apple_id) {
                case APPLE_640x480:             apple_mask = 0x01; break;
                case APPLE_800x600:             apple_mask = 0x02; break;
                case APPLE_1024x768:    apple_mask = 0x04; break;
                case APPLE_1152x768:    apple_mask = 0x40; break;
                case APPLE_1152x900:    apple_mask = 0x08; break;
                case APPLE_1280x1024:   apple_mask = 0x10; break;
                case APPLE_1600x1200:   apple_mask = 0x20; break;
                default:                                apple_mask = 0x00; break;
                }
                return (window_modes & apple_mask);
        }
#else
        return true;
#endif
        return false;
}

// 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))
                return;

        // Fill in VideoMode entry
        VIDEO_MODE mode;
#ifdef SHEEPSHAVER
        // Recalculate dimensions to fit Apple modes
        resolution_id = match_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 = depth;
        VideoModes.push_back(mode);
}

// Add standard list of windowed modes for given color depth
static void add_window_modes(int depth)
{
        video_depth vdepth = (video_depth)depth;
        add_mode(DISPLAY_WINDOW, 512, 384, 0x80, TrivialBytesPerRow(512, vdepth), depth);
        add_mode(DISPLAY_WINDOW, 640, 480, 0x81, TrivialBytesPerRow(640, vdepth), depth);
        add_mode(DISPLAY_WINDOW, 800, 600, 0x82, TrivialBytesPerRow(800, vdepth), depth);
        add_mode(DISPLAY_WINDOW, 1024, 768, 0x83, TrivialBytesPerRow(1024, vdepth), depth);
        add_mode(DISPLAY_WINDOW, 1152, 870, 0x84, TrivialBytesPerRow(1152, vdepth), depth);
        add_mode(DISPLAY_WINDOW, 1280, 1024, 0x85, TrivialBytesPerRow(1280, vdepth), depth);
        add_mode(DISPLAY_WINDOW, 1600, 1200, 0x86, TrivialBytesPerRow(1600, vdepth), depth);
}

// 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);
}


/*
 *  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)
};

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);

        // Free frame buffer(s)
        if (!use_vosf) {
                if (the_buffer) {
                        free(the_buffer);
                        the_buffer = NULL;
                }
                if (the_buffer_copy) {
                        free(the_buffer_copy);
                        the_buffer_copy = NULL;
                }
        }
#ifdef ENABLE_VOSF
        else {
                // the_buffer shall always be mapped through vm_acquire() so that we can vm_protect() it at will
                if (the_buffer != VM_MAP_FAILED) {
                        D(bug(" releasing the_buffer at %p (%d bytes)\n", the_buffer, the_buffer_size));
                        vm_release(the_buffer, the_buffer_size);
                        the_buffer = NULL;
                }
                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;
                }
        }
#endif
}

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

        if (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
 */

// 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);

        // Create surface
        int depth = (VIDEO_MODE_DEPTH <= VIDEO_DEPTH_8BIT ? 8 : screen_depth);
        if ((s = SDL_SetVideoMode(width, height, depth, SDL_HWSURFACE)) == 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(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));
#else
        // 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 *)calloc(1, the_buffer_size);
        D(bug("the_buffer = %p, the_buffer_copy = %p\n", the_buffer, the_buffer_copy));
#endif

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

        // 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, sdl_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);
}

/*
 *  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];
                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
                                static const char alias_str[] = "alias";
                                if (strncmp(line, alias_str, sizeof(alias_str) - 1) == 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;
                                else
                                        break;
                        } else {
                                // Search for SDL video driver string
                                static const char alias_sdl_str[] = "alias SDL";
                                if (strncmp(line, alias_sdl_str, sizeof(alias_sdl_str) - 1) == 0) {
                                        char *p = line + sizeof(alias_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;
                }
        }
}

// 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;
        }
        if (drv == NULL)
                return false;
        if (!drv->init_ok) {
                delete drv;
                drv = NULL;
                return false;
        }

#ifdef ENABLE_VOSF
        if (use_vosf) {
                // Initialize the VOSF system
                if (!video_vosf_init(*this)) {
                        ErrorAlert(STR_VOSF_INIT_ERR);
                return false;
                }
        }
#endif
        
        // Initialize VideoRefresh function
        VideoRefreshInit();

        // Lock down frame buffer
        LOCK_FRAME_BUFFER;

        // Start redraw/input thread
        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;
        }
        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_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
        const char *mode_str = NULL;
#ifndef SHEEPSHAVER
        if (classic_mode)
                mode_str = "win/512/342";
        else
                mode_str = PrefsFindString("screen");
#endif

        // 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;
        }
        int max_width = 640, max_height = 480;
        SDL_Rect **modes = SDL_ListModes(NULL, SDL_FULLSCREEN | SDL_HWSURFACE);
        if (modes && modes != (SDL_Rect **)-1) {
                max_width = modes[0]->w;
                max_height = modes[0]->h;
                if (default_width > max_width)
                        default_width = max_width;
                if (default_height > max_height)
                        default_height = max_height;
        }
        if (default_width <= 0)
                default_width = max_width;
        if (default_height <= 0)
                default_height = max_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;
        }

        // 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 d = VIDEO_DEPTH_1BIT; d <= default_depth; d++) {
                                int bpp = (d <= VIDEO_DEPTH_8BIT ? 8 : sdl_depth_of_video_depth(d));
                                if (SDL_VideoModeOK(max_width, max_height, bpp, SDL_HWSURFACE))
                                        add_window_modes(video_depth(d));
                        }
                }
        } else
                add_mode(display_type, default_width, default_height, 0x80, TrivialBytesPerRow(default_width, (video_depth)default_depth), default_depth);
        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"));

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

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

#ifdef ENABLE_VOSF
        if (use_vosf) {
                // Deinitialize VOSF
                video_vosf_exit();
        }
#endif

        // 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);
}


/*
 *  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 (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
                // 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
                        DisableInterrupt();

                        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
                        EnableInterrupt();
                        return noErr;
                }
        }
        return paramErr;
}
#endif

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

        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 hw_mac_cursor_accl && (display_type != DISPLAY_SCREEN);
        return false;
}
#endif


/*
 *  Set cursor image for window
 */

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


/*
 *  Install graphics acceleration
 */

#ifdef SHEEPSHAVER
// Rectangle inversion
template< int bpp >
static inline void do_invrect(uint8 *dest, uint32 length)
{
#define INVERT_1(PTR, OFS) ((uint8  *)(PTR))[OFS] = ~((uint8  *)(PTR))[OFS]
#define INVERT_2(PTR, OFS) ((uint16 *)(PTR))[OFS] = ~((uint16 *)(PTR))[OFS]
#define INVERT_4(PTR, OFS) ((uint32 *)(PTR))[OFS] = ~((uint32 *)(PTR))[OFS]
#define INVERT_8(PTR, OFS) ((uint64 *)(PTR))[OFS] = ~((uint64 *)(PTR))[OFS]

#ifndef UNALIGNED_PROFITABLE
        // Align on 16-bit boundaries
        if (bpp < 16 && (((uintptr)dest) & 1)) {
                INVERT_1(dest, 0);
                dest += 1; length -= 1;
        }

        // Align on 32-bit boundaries
        if (bpp < 32 && (((uintptr)dest) & 2)) {
                INVERT_2(dest, 0);
                dest += 2; length -= 2;
        }
#endif

        // Invert 8-byte words
        if (length >= 8) {
                const int r = (length / 8) % 8;
                dest += r * 8;

                int n = ((length / 8) + 7) / 8;
                switch (r) {
                case 0: do {
                                dest += 64;
                                INVERT_8(dest, -8);
                case 7: INVERT_8(dest, -7);
                case 6: INVERT_8(dest, -6);
                case 5: INVERT_8(dest, -5);
                case 4: INVERT_8(dest, -4);
                case 3: INVERT_8(dest, -3);
                case 2: INVERT_8(dest, -2);
                case 1: INVERT_8(dest, -1);
                                } while (--n > 0);
                }
        }

        // 32-bit cell to invert?
        if (length & 4) {
                INVERT_4(dest, 0);
                if (bpp <= 16)
                        dest += 4;
        }

        // 16-bit cell to invert?
        if (bpp <= 16 && (length & 2)) {
                INVERT_2(dest, 0);
                if (bpp <= 8)
                        dest += 2;
        }

        // 8-bit cell to invert?
        if (bpp <= 8 && (length & 1))
                INVERT_1(dest, 0);

#undef INVERT_1
#undef INVERT_2
#undef INVERT_4
#undef INVERT_8
}

void NQD_invrect(uint32 p)
{
        D(bug("accl_invrect %08x\n", p));

        // Get inversion parameters
        int16 dest_X = (int16)ReadMacInt16(p + acclDestRect + 2) - (int16)ReadMacInt16(p + acclDestBoundsRect + 2);
        int16 dest_Y = (int16)ReadMacInt16(p + acclDestRect + 0) - (int16)ReadMacInt16(p + acclDestBoundsRect + 0);
        int16 width  = (int16)ReadMacInt16(p + acclDestRect + 6) - (int16)ReadMacInt16(p + acclDestRect + 2);
        int16 height = (int16)ReadMacInt16(p + acclDestRect + 4) - (int16)ReadMacInt16(p + acclDestRect + 0);
        D(bug(" dest X %d, dest Y %d\n", dest_X, dest_Y));
        D(bug(" width %d, height %d, bytes_per_row %d\n", width, height, (int32)ReadMacInt32(p + acclDestRowBytes)));

        //!!?? pen_mode == 14

        // And perform the inversion
        const int bpp = bytes_per_pixel(ReadMacInt32(p + acclDestPixelSize));
        const int dest_row_bytes = (int32)ReadMacInt32(p + acclDestRowBytes);
        uint8 *dest = Mac2HostAddr(ReadMacInt32(p + acclDestBaseAddr) + (dest_Y * dest_row_bytes) + (dest_X * bpp));
        width *= bpp;
        switch (bpp) {
        case 1:
                for (int i = 0; i < height; i++) {
                        do_invrect<8>(dest, width);
                        dest += dest_row_bytes;
                }
                break;
        case 2:
                for (int i = 0; i < height; i++) {
                        do_invrect<16>(dest, width);
                        dest += dest_row_bytes;
                }
                break;
        case 4:
                for (int i = 0; i < height; i++) {
                        do_invrect<32>(dest, width);
                        dest += dest_row_bytes;
                }
                break;
        }
}

// Rectangle filling
template< int bpp >
static inline void do_fillrect(uint8 *dest, uint32 color, uint32 length)
{
#define FILL_1(PTR, OFS, VAL) ((uint8  *)(PTR))[OFS] = (VAL)
#define FILL_2(PTR, OFS, VAL) ((uint16 *)(PTR))[OFS] = (VAL)
#define FILL_4(PTR, OFS, VAL) ((uint32 *)(PTR))[OFS] = (VAL)
#define FILL_8(PTR, OFS, VAL) ((uint64 *)(PTR))[OFS] = (VAL)

#ifndef UNALIGNED_PROFITABLE
        // Align on 16-bit boundaries
        if (bpp < 16 && (((uintptr)dest) & 1)) {
                FILL_1(dest, 0, color);
                dest += 1; length -= 1;
        }

        // Align on 32-bit boundaries
        if (bpp < 32 && (((uintptr)dest) & 2)) {
                FILL_2(dest, 0, color);
                dest += 2; length -= 2;
        }
#endif

        // Fill 8-byte words
        if (length >= 8) {
                const uint64 c = (((uint64)color) << 32) | color;
                const int r = (length / 8) % 8;
                dest += r * 8;

                int n = ((length / 8) + 7) / 8;
                switch (r) {
                case 0: do {
                                dest += 64;
                                FILL_8(dest, -8, c);
                case 7: FILL_8(dest, -7, c);
                case 6: FILL_8(dest, -6, c);
                case 5: FILL_8(dest, -5, c);
                case 4: FILL_8(dest, -4, c);
                case 3: FILL_8(dest, -3, c);
                case 2: FILL_8(dest, -2, c);
                case 1: FILL_8(dest, -1, c);
                                } while (--n > 0);
                }
        }

        // 32-bit cell to fill?
        if (length & 4) {
                FILL_4(dest, 0, color);
                if (bpp <= 16)
                        dest += 4;
        }

        // 16-bit cell to fill?
        if (bpp <= 16 && (length & 2)) {
                FILL_2(dest, 0, color);
                if (bpp <= 8)
                        dest += 2;
        }

        // 8-bit cell to fill?
        if (bpp <= 8 && (length & 1))
                FILL_1(dest, 0, color);

#undef FILL_1
#undef FILL_2
#undef FILL_4
#undef FILL_8
}

void NQD_fillrect(uint32 p)
{
        D(bug("accl_fillrect %08x\n", p));

        // Get filling parameters
        int16 dest_X = (int16)ReadMacInt16(p + acclDestRect + 2) - (int16)ReadMacInt16(p + acclDestBoundsRect + 2);
        int16 dest_Y = (int16)ReadMacInt16(p + acclDestRect + 0) - (int16)ReadMacInt16(p + acclDestBoundsRect + 0);
        int16 width  = (int16)ReadMacInt16(p + acclDestRect + 6) - (int16)ReadMacInt16(p + acclDestRect + 2);
        int16 height = (int16)ReadMacInt16(p + acclDestRect + 4) - (int16)ReadMacInt16(p + acclDestRect + 0);
        uint32 color = htonl(ReadMacInt32(p + acclPenMode) == 8 ? ReadMacInt32(p + acclForePen) : ReadMacInt32(p + acclBackPen));
        D(bug(" dest X %d, dest Y %d\n", dest_X, dest_Y));
        D(bug(" width %d, height %d\n", width, height));
        D(bug(" bytes_per_row %d color %08x\n", (int32)ReadMacInt32(p + acclDestRowBytes), color));

        // And perform the fill
        const int bpp = bytes_per_pixel(ReadMacInt32(p + acclDestPixelSize));
        const int dest_row_bytes = (int32)ReadMacInt32(p + acclDestRowBytes);
        uint8 *dest = Mac2HostAddr(ReadMacInt32(p + acclDestBaseAddr) + (dest_Y * dest_row_bytes) + (dest_X * bpp));
        width *= bpp;
        switch (bpp) {
        case 1:
                for (int i = 0; i < height; i++) {
                        memset(dest, color, width);
                        dest += dest_row_bytes;
                }
                break;
        case 2:
                for (int i = 0; i < height; i++) {
                        do_fillrect<16>(dest, color, width);
                        dest += dest_row_bytes;
                }
                break;
        case 4:
                for (int i = 0; i < height; i++) {
                        do_fillrect<32>(dest, color, width);
                        dest += dest_row_bytes;
                }
                break;
        }
}

bool NQD_fillrect_hook(uint32 p)
{
        D(bug("accl_fillrect_hook %08x\n", p));

        // Check if we can accelerate this fillrect
        if (ReadMacInt32(p + 0x284) != 0 && ReadMacInt32(p + acclDestPixelSize) >= 8) {
                const int transfer_mode = ReadMacInt32(p + acclTransferMode);
                if (transfer_mode == 8) {
                        // Fill
                        WriteMacInt32(p + acclDrawProc, NativeTVECT(NATIVE_FILLRECT));
                        return true;
                }
                else if (transfer_mode == 10) {
                        // Invert
                        WriteMacInt32(p + acclDrawProc, NativeTVECT(NATIVE_INVRECT));
                        return true;
                }
        }
        return false;
}

// Rectangle blitting
// TODO: optimize for VOSF and target pixmap == screen
void NQD_bitblt(uint32 p)
{
        D(bug("accl_bitblt %08x\n", p));

        // Get blitting parameters
        int16 src_X  = (int16)ReadMacInt16(p + acclSrcRect + 2) - (int16)ReadMacInt16(p + acclSrcBoundsRect + 2);
        int16 src_Y  = (int16)ReadMacInt16(p + acclSrcRect + 0) - (int16)ReadMacInt16(p + acclSrcBoundsRect + 0);
        int16 dest_X = (int16)ReadMacInt16(p + acclDestRect + 2) - (int16)ReadMacInt16(p + acclDestBoundsRect + 2);
        int16 dest_Y = (int16)ReadMacInt16(p + acclDestRect + 0) - (int16)ReadMacInt16(p + acclDestBoundsRect + 0);
        int16 width  = (int16)ReadMacInt16(p + acclDestRect + 6) - (int16)ReadMacInt16(p + acclDestRect + 2);
        int16 height = (int16)ReadMacInt16(p + acclDestRect + 4) - (int16)ReadMacInt16(p + acclDestRect + 0);
        D(bug(" src addr %08x, dest addr %08x\n", ReadMacInt32(p + acclSrcBaseAddr), ReadMacInt32(p + acclDestBaseAddr)));
        D(bug(" src X %d, src Y %d, dest X %d, dest Y %d\n", src_X, src_Y, dest_X, dest_Y));
        D(bug(" width %d, height %d\n", width, height));

        // And perform the blit
        const int bpp = bytes_per_pixel(ReadMacInt32(p + acclSrcPixelSize));
        width *= bpp;
        if ((int32)ReadMacInt32(p + acclSrcRowBytes) > 0) {
                const int src_row_bytes = (int32)ReadMacInt32(p + acclSrcRowBytes);
                const int dst_row_bytes = (int32)ReadMacInt32(p + acclDestRowBytes);
                uint8 *src = Mac2HostAddr(ReadMacInt32(p + acclSrcBaseAddr) + (src_Y * src_row_bytes) + (src_X * bpp));
                uint8 *dst = Mac2HostAddr(ReadMacInt32(p + acclDestBaseAddr) + (dest_Y * dst_row_bytes) + (dest_X * bpp));
                for (int i = 0; i < height; i++) {
                        memmove(dst, src, width);
                        src += src_row_bytes;
                        dst += dst_row_bytes;
                }
        }
        else {
                const int src_row_bytes = -(int32)ReadMacInt32(p + acclSrcRowBytes);
                const int dst_row_bytes = -(int32)ReadMacInt32(p + acclDestRowBytes);
                uint8 *src = Mac2HostAddr(ReadMacInt32(p + acclSrcBaseAddr) + ((src_Y + height - 1) * src_row_bytes) + (src_X * bpp));
                uint8 *dst = Mac2HostAddr(ReadMacInt32(p + acclDestBaseAddr) + ((dest_Y + height - 1) * dst_row_bytes) + (dest_X * bpp));
                for (int i = height - 1; i >= 0; i--) {
                        memmove(dst, src, width);
                        src -= src_row_bytes;
                        dst -= dst_row_bytes;
                }
        }
}

/*
  BitBlt transfer modes:
  0 : srcCopy
  1 : srcOr
  2 : srcXor
  3 : srcBic
  4 : notSrcCopy
  5 : notSrcOr
  6 : notSrcXor
  7 : notSrcBic
  32 : blend
  33 : addPin
  34 : addOver
  35 : subPin
  36 : transparent
  37 : adMax
  38 : subOver
  39 : adMin
  50 : hilite
*/

bool NQD_bitblt_hook(uint32 p)
{
        D(bug("accl_draw_hook %08x\n", p));

        // Check if we can accelerate this bitblt
        if (ReadMacInt32(p + 0x018) + ReadMacInt32(p + 0x128) == 0 &&
                ReadMacInt32(p + 0x130) == 0 &&
                ReadMacInt32(p + acclSrcPixelSize) >= 8 &&
                ReadMacInt32(p + acclSrcPixelSize) == ReadMacInt32(p + acclDestPixelSize) &&
                (ReadMacInt32(p + acclSrcRowBytes) ^ ReadMacInt32(p + acclDestRowBytes)) >= 0 && // same sign?
                ReadMacInt32(p + acclTransferMode) == 0 &&                                                                               // srcCopy?
                ReadMacInt32(p + 0x15c) > 0) {

                // Yes, set function pointer
                WriteMacInt32(p + acclDrawProc, NativeTVECT(NATIVE_BITBLT));
                return true;
        }
        return false;
}

// Wait for graphics operation to finish
bool NQD_sync_hook(uint32 arg)
{
        D(bug("accl_sync_hook %08x\n", arg));
        return true;
}

void VideoInstallAccel(void)
{
        // Install acceleration hooks
        if (PrefsFindBool("gfxaccel")) {
                D(bug("Video: Installing acceleration hooks\n"));
                uint32 base;

                SheepVar bitblt_hook_info(sizeof(accl_hook_info));
                base = bitblt_hook_info.addr();
                WriteMacInt32(base + 0, NativeTVECT(NATIVE_BITBLT_HOOK));
                WriteMacInt32(base + 4, NativeTVECT(NATIVE_SYNC_HOOK));
                WriteMacInt32(base + 8, ACCL_BITBLT);
                NQDMisc(6, bitblt_hook_info.ptr());

                SheepVar fillrect_hook_info(sizeof(accl_hook_info));
                base = fillrect_hook_info.addr();
                WriteMacInt32(base + 0, NativeTVECT(NATIVE_FILLRECT_HOOK));
                WriteMacInt32(base + 4, NativeTVECT(NATIVE_SYNC_HOOK));
                WriteMacInt32(base + 8, ACCL_FILLRECT);
                NQDMisc(6, fillrect_hook_info.ptr());
        }
}
#endif


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

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

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_numbersign: return 0x14;
        case SDLK_4: case SDLK_DOLLAR: return 0x15;
//      case SDLK_5: case SDLK_percent: 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: case SDLK_asciitilde: return 0x0a;
        case SDLK_MINUS: case SDLK_UNDERSCORE: return 0x1b;
        case SDLK_EQUALS: case SDLK_PLUS: return 0x18;
//      case SDLK_bracketleft: case SDLK_braceleft: return 0x21;
//      case SDLK_bracketright: case SDLK_braceright: return 0x1e;
//      case SDLK_BACKSLASH: case SDLK_bar: return 0x2a;
        case SDLK_SEMICOLON: case SDLK_COLON: return 0x29;
//      case SDLK_apostrophe: 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;
        case SDLK_LALT: return 0x37;
        case SDLK_RALT: return 0x37;
        case SDLK_LMETA: return 0x3a;
        case SDLK_RMETA: 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) {
                                        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) {
                                        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 && code != 0x39) {        // Don't propagate Caps Lock releases
                                        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 (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);
                        }
                }
        }
}


// 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();
                        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;
                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;
        }
}

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

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++;

                // Handle SDL events
                handle_events();

                // Refresh display
                video_refresh();

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

        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;
}
Revision:	1.5
Committed:	2004-06-24T21:46:55Z (20 years ago) by gbeauche
Branch:	MAIN
Changes since 1.4:	+69 -16 lines
Log Message:	Try to get maximum display width by assuming that would match maximum possible resolution for fullscreen+hwsurface. Fix, termination of VModes[]. Really handle "windowmodes" prefs item, but this needs code factoring.