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root/cebix/BasiliskII/src/MacOSX/video_macosx.mm
Revision: 1.2
Committed: 2002-04-05T12:15:34Z (22 years, 6 months ago) by nigel
Branch: MAIN
Changes since 1.1: +13 -6 lines
Log Message:
Modify getCFint32() to cope with values of zero
(it was assuming 0 was an error condition)

File Contents

# User Rev Content
1 nigel 1.1 /*
2 nigel 1.2 * $Id: video_macosx.mm,v 1.2 2002/03/16 10:00:19 nigel Exp $
3 nigel 1.1 *
4     * video_macosx.mm - Interface between Basilisk II and Cocoa windowing.
5     * Based on video_amiga.cpp and video_x.cpp
6     *
7     * Basilisk II (C) 1997-2002 Christian Bauer
8     *
9     * This program is free software; you can redistribute it and/or modify
10     * it under the terms of the GNU General Public License as published by
11     * the Free Software Foundation; either version 2 of the License, or
12     * (at your option) any later version.
13     *
14     * This program is distributed in the hope that it will be useful,
15     * but WITHOUT ANY WARRANTY; without even the implied warranty of
16     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17     * GNU General Public License for more details.
18     *
19     * You should have received a copy of the GNU General Public License
20     * along with this program; if not, write to the Free Software
21     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22     */
23    
24    
25     #include "sysdeps.h"
26    
27     #ifdef HAVE_PTHREADS
28     # include <pthread.h>
29     #endif
30    
31     #include <adb.h>
32     #include <cpu_emulation.h>
33     #include <main.h>
34     #include "macos_util_macosx.h"
35     #include <prefs.h>
36     #include <user_strings.h>
37     #include "video_macosx.h"
38    
39     #define DEBUG 0
40     #include "debug.h"
41    
42    
43    
44     // Global variables
45     uint8 display_type = DISPLAY_WINDOW, // These are used by PrefsEditor
46     frame_skip;
47     uint16 init_width = MIN_WIDTH, // as well as this code
48     init_height = MIN_HEIGHT,
49     init_depth = 32,
50     screen_height = MIN_HEIGHT; // Used by processMouseMove
51    
52     EmulatorView *output = nil; // Set by [EmulatorView init]
53     NSWindow *the_win = nil; // Set by [Emulator awakeFromNib]
54     static void *the_buffer = NULL;
55    
56    
57     #import <Foundation/NSString.h> // Needed for NSLog(@"")
58    
59     #ifdef CGIMAGEREF
60     static CGImageRef imageRef = nil;
61     #endif
62    
63     #ifdef NSBITMAP
64     #import <AppKit/NSBitmapImageRep.h>
65    
66     static NSBitmapImageRep *bitmap = nil;
67     #endif
68    
69     // These record changes we made in setting full screen mode
70     CGDirectDisplayID theDisplay = NULL;
71     CFDictionaryRef originalMode = NULL,
72     newMode = NULL;
73    
74    
75    
76     // Prototypes
77    
78     static void add_mode (const uint16 width, const uint16 height,
79     const uint32 resolution_id,
80     const uint32 bytes_per_row,
81     const video_depth depth);
82     static void add_standard_modes (const video_depth depth);
83    
84     static bool video_open (const video_mode &mode);
85     static void video_close (void);
86    
87    
88    
89     /*
90     * Utility functions
91     */
92    
93     uint8 bits_from_depth(const video_depth depth)
94     {
95     int bits = 1 << depth;
96     // if (bits == 16)
97     // bits = 15;
98     // else if (bits == 32)
99     // bits = 24;
100     return bits;
101     }
102    
103     char *
104     colours_from_depth(const video_depth depth)
105     {
106     switch ( depth )
107     {
108     case VDEPTH_1BIT : return "Monochrome";
109     case VDEPTH_2BIT : return "4 colours";
110     case VDEPTH_4BIT : return "16 colours";
111     case VDEPTH_8BIT : return "256 colours";
112     case VDEPTH_16BIT: return "Thousands of colours";
113     case VDEPTH_32BIT: return "Millions of colours";
114     }
115    
116     return "illegal colour depth";
117     }
118    
119     char *
120     colours_from_depth(const uint16 depth)
121     {
122     return colours_from_depth(DepthModeForPixelDepth(depth) );
123     }
124    
125     bool
126     parse_screen_prefs(const char *mode_str)
127     {
128     if (sscanf(mode_str, "win/%hd/%hd/%hd",
129     &init_width, &init_height, &init_depth) == 3)
130     display_type = DISPLAY_WINDOW;
131     else if (sscanf(mode_str, "win/%hd/%hd", &init_width, &init_height) == 2)
132     display_type = DISPLAY_WINDOW;
133     else if (strcmp(mode_str, "full") == 0)
134     display_type = DISPLAY_SCREEN;
135     else if (sscanf(mode_str, "full/%hd/%hd/%hd",
136     &init_width, &init_height, &init_depth) == 3)
137     display_type = DISPLAY_SCREEN;
138     else if (sscanf(mode_str, "full/%hd/%hd", &init_width, &init_height) == 2)
139     display_type = DISPLAY_SCREEN;
140     else if (sscanf(mode_str, "opengl/%hd/%hd/%hd",
141     &init_width, &init_height, &init_depth) == 3)
142     display_type = DISPLAY_OPENGL;
143     else if (sscanf(mode_str, "opengl/%hd/%hd", &init_width, &init_height) == 2)
144     display_type = DISPLAY_OPENGL;
145     else return false;
146    
147     return true;
148     }
149    
150    
151     // Add mode to list of supported modes
152     static void
153     add_mode(const uint16 width, const uint16 height,
154     const uint32 resolution_id, const uint32 bytes_per_row,
155     const video_depth depth)
156     {
157     video_mode mode;
158     mode.x = width;
159     mode.y = height;
160     mode.resolution_id = resolution_id;
161     mode.bytes_per_row = bytes_per_row;
162     mode.depth = depth;
163    
164     D(bug("Added video mode: w=%ld h=%ld d=%ld(%d bits)\n",
165     width, height, depth, bits_from_depth(depth) ));
166    
167     VideoModes.push_back(mode);
168     }
169    
170     // Add standard list of windowed modes for given color depth
171     static void add_standard_modes(const video_depth depth)
172     {
173     D(bug("add_standard_modes: depth=%ld(%d bits)\n",
174     depth, bits_from_depth(depth) ));
175    
176     add_mode(512, 384, 0x80, TrivialBytesPerRow(512, depth), depth);
177     add_mode(640, 480, 0x81, TrivialBytesPerRow(640, depth), depth);
178     add_mode(800, 600, 0x82, TrivialBytesPerRow(800, depth), depth);
179     add_mode(832, 624, 0x83, TrivialBytesPerRow(832, depth), depth);
180     add_mode(1024, 768, 0x84, TrivialBytesPerRow(1024, depth), depth);
181     add_mode(1152, 768, 0x85, TrivialBytesPerRow(1152, depth), depth);
182     add_mode(1152, 870, 0x86, TrivialBytesPerRow(1152, depth), depth);
183     add_mode(1280, 1024, 0x87, TrivialBytesPerRow(1280, depth), depth);
184     add_mode(1600, 1200, 0x88, TrivialBytesPerRow(1600, depth), depth);
185     }
186    
187     // Helper function to get a 32bit int from a dictionary
188     static int32 getCFint32 (CFDictionaryRef dict, CFStringRef key)
189     {
190     CFNumberRef ref = CFDictionaryGetValue(dict, key);
191    
192 nigel 1.2 if ( ref )
193     {
194     int32 val;
195    
196     if ( CFNumberGetValue(ref, kCFNumberSInt32Type, &val) )
197     return val;
198     else
199     NSLog(@"getCFint32() - Failed to get the value %@", key);
200     }
201     else
202     NSLog(@"getCFint32() - Failed to get a 32bit int for %@", key);
203 nigel 1.1
204 nigel 1.2 return 0;
205 nigel 1.1 }
206    
207     static bool add_CGDirectDisplay_modes()
208     {
209     #define kMaxDisplays 8
210     CGDirectDisplayID displays[kMaxDisplays];
211     CGDisplayErr err;
212     CGDisplayCount n;
213     int32 oldRes = 0,
214     res_id = 0x80;
215    
216    
217     err = CGGetActiveDisplayList(kMaxDisplays, displays, &n);
218     if ( err != CGDisplayNoErr )
219     return false;
220    
221     for ( CGDisplayCount dc = 0; dc < n; ++dc )
222     {
223     CGDirectDisplayID d = displays[dc];
224     CFArrayRef m = CGDisplayAvailableModes(d);
225    
226     if ( m == NULL ) // Store the current display mode
227     add_mode(CGDisplayPixelsWide(d),
228     CGDisplayPixelsHigh(d),
229     res_id++, CGDisplayBytesPerRow(d),
230     DepthModeForPixelDepth(CGDisplayBitsPerPixel(d)));
231     else
232     {
233     CFIndex nModes = CFArrayGetCount(m);
234    
235     for ( CFIndex mc = 0; mc < nModes; ++mc )
236     {
237     CFDictionaryRef modeSpec = CFArrayGetValueAtIndex(m, mc);
238    
239     int32 bpp = getCFint32(modeSpec, kCGDisplayBitsPerPixel);
240     int32 height = getCFint32(modeSpec, kCGDisplayHeight);
241     int32 mode = getCFint32(modeSpec, kCGDisplayMode);
242     int32 width = getCFint32(modeSpec, kCGDisplayWidth);
243     video_depth depth = DepthModeForPixelDepth(bpp);
244    
245     if ( ! bpp || ! height || ! width )
246     {
247     NSLog(@"Could not get details of mode %d, display %d",
248     mc, dc);
249     return false;
250     }
251     #if DEBUG
252     else
253     NSLog(@"Display %ld, spec = %@", d, modeSpec);
254     #endif
255    
256     add_mode(width, height, res_id,
257     TrivialBytesPerRow(width, depth), depth);
258    
259     if ( ! oldRes )
260     oldRes = width * height;
261     else
262     if ( oldRes != width * height )
263     {
264     oldRes = width * height;
265     ++res_id;
266     }
267     }
268     }
269     }
270    
271     return true;
272     }
273    
274     // Set Mac frame layout and base address (uses the_buffer/MacFrameBaseMac)
275     static void set_mac_frame_buffer(video_depth depth)
276     {
277     #if !REAL_ADDRESSING && !DIRECT_ADDRESSING
278     switch ( depth )
279     {
280     // case VDEPTH_15BIT:
281     case VDEPTH_16BIT: MacFrameLayout = FLAYOUT_HOST_555; break;
282     // case VDEPTH_24BIT:
283     case VDEPTH_32BIT: MacFrameLayout = FLAYOUT_HOST_888; break;
284     default : MacFrameLayout = FLAYOUT_DIRECT;
285     }
286     VideoMonitor.mac_frame_base = MacFrameBaseMac;
287    
288     // Set variables used by UAE memory banking
289     MacFrameBaseHost = the_buffer;
290     MacFrameSize = VideoMonitor.mode.bytes_per_row * VideoMonitor.mode.y;
291     InitFrameBufferMapping();
292     #else
293     VideoMonitor.mac_frame_base = Host2MacAddr(the_buffer);
294     #endif
295     D(bug("VideoMonitor.mac_frame_base = %08x\n", VideoMonitor.mac_frame_base));
296     }
297    
298     void resizeWinBy(const short deltaX, const short deltaY)
299     {
300     NSRect rect = [the_win frame];
301    
302     D(bug("resizeWinBy(%d,%d) - ", deltaX, deltaY));
303     D(bug("old x=%g, y=%g", rect.size.width, rect.size.height));
304    
305     rect.size.width += deltaX;
306     rect.size.height += deltaY;
307    
308     D(bug(", new x=%g, y=%g\n", rect.size.width, rect.size.height));
309    
310     [the_win setFrame: rect display: YES];
311     rect = [the_win frame];
312     }
313    
314     void resizeWinTo(const uint16 newWidth, const uint16 newHeight)
315     {
316     int deltaX = newWidth - [output width],
317     deltaY = newHeight - [output height];
318    
319     D(bug("resizeWinTo(%d,%d)\n", newWidth, newHeight));
320    
321     if ( deltaX || deltaY )
322     resizeWinBy(deltaX, deltaY);
323     }
324    
325     // Open window
326     static bool init_window(const video_mode &mode)
327     {
328     #ifdef CGIMAGEREF
329     CGColorSpaceRef colourSpace;
330     CGDataProviderRef provider;
331     #endif
332     short bitsPer, samplesPer; // How big is each Pixel?
333     int the_buffer_size;
334    
335     D(bug("init_window: depth=%ld(%d bits)\n",
336     mode.depth, bits_from_depth(mode.depth) ));
337    
338    
339     // Set absolute mouse mode
340     ADBSetRelMouseMode(false);
341    
342    
343     // Open window
344     if (the_win == NULL)
345     {
346     ErrorAlert(STR_OPEN_WINDOW_ERR);
347     return false;
348     }
349     resizeWinTo(mode.x, mode.y);
350    
351    
352     // Create frame buffer ("height + 2" for safety)
353     the_buffer_size = mode.bytes_per_row * (mode.y + 2);
354     the_buffer = calloc(the_buffer_size, 1);
355     if (the_buffer == NULL)
356     {
357     NSLog(@"calloc(%d) failed", the_buffer_size);
358     ErrorAlert(STR_NO_MEM_ERR);
359     return false;
360     }
361     D(bug("the_buffer = %p\n", the_buffer));
362    
363    
364     if ( mode.depth == VDEPTH_1BIT )
365     bitsPer = 1;
366     else
367     bitsPer = 8;
368    
369     if ( mode.depth == VDEPTH_32BIT )
370     samplesPer = 3;
371     else
372     samplesPer = 1;
373    
374     #ifdef CGIMAGEREF
375     switch ( mode.depth )
376     {
377     //case VDEPTH_1BIT: colourSpace = CGColorSpaceCreateDeviceMono(); break
378     case VDEPTH_8BIT: colourSpace = CGColorSpaceCreateDeviceGray(); break;
379     case VDEPTH_32BIT: colourSpace = CGColorSpaceCreateDeviceRGB(); break;
380     default: colourSpace = NULL;
381     }
382    
383     if ( ! colourSpace )
384     {
385     ErrorAlert("No valid colour space");
386     return false;
387     }
388    
389     provider = CGDataProviderCreateWithData(NULL, the_buffer,
390     the_buffer_size, NULL);
391     if ( ! provider )
392     {
393     ErrorAlert("Could not create CGDataProvider from buffer data");
394     return false;
395     }
396     imageRef = CGImageCreate(mode.x,
397     mode.y,
398     bitsPer,
399     bits_from_depth(mode.depth),
400     mode.bytes_per_row,
401     colourSpace,
402     kCGImageAlphaNoneSkipFirst,
403     provider,
404     NULL, // colourMap
405     NO, // shouldInterpolate
406     kCGRenderingIntentDefault);
407     if ( ! imageRef )
408     {
409     ErrorAlert("Could not create CGImage from CGDataProvider");
410     return false;
411     }
412     CGDataProviderRelease(provider);
413     CGColorSpaceRelease(colourSpace);
414    
415     [output readyToDraw: imageRef
416     imageWidth: mode.x
417     imageHeight: mode.y];
418     #else
419     unsigned char *offsetBuffer = the_buffer;
420     offsetBuffer += 1; // OS X NSBitmaps are RGBA, but Basilisk generates ARGB
421     #endif
422    
423     #ifdef NSBITMAP
424     bitmap = [NSBitmapImageRep alloc];
425     bitmap = [bitmap initWithBitmapDataPlanes: (unsigned char **) &offsetBuffer
426     pixelsWide: mode.x
427     pixelsHigh: mode.y
428     bitsPerSample: bitsPer
429     samplesPerPixel: samplesPer
430     hasAlpha: NO
431     isPlanar: NO
432     colorSpaceName: NSCalibratedRGBColorSpace
433     bytesPerRow: mode.bytes_per_row
434     bitsPerPixel: bits_from_depth(mode.depth)];
435    
436     if ( bitmap == nil )
437     {
438     ErrorAlert("Could not allocate an NSBitmapImageRep");
439     return false;
440     }
441    
442     [output readyToDraw: bitmap
443     imageWidth: mode.x
444     imageHeight: mode.y];
445     #endif
446    
447     #ifdef CGDRAWBITMAP
448     [output readyToDraw: offsetBuffer
449     width: mode.x
450     height: mode.y
451     bps: bitsPer
452     spp: samplesPer
453     bpp: bits_from_depth(mode.depth)
454     bpr: mode.bytes_per_row
455     isPlanar: NO
456     hasAlpha: NO];
457     #endif
458    
459     // Set VideoMonitor
460     VideoMonitor.mode = mode;
461     set_mac_frame_buffer(mode.depth);
462    
463     return true;
464     }
465    
466     #import <AppKit/NSEvent.h>
467    
468     // How do I include this file?
469     // #import <Carbon/HIToolbox/Menus.h>
470     extern "C" void HideMenuBar(),
471     ShowMenuBar();
472    
473     static bool init_screen(const video_mode &mode)
474     {
475     // Set absolute mouse mode
476     ADBSetRelMouseMode(false);
477    
478    
479     theDisplay = kCGDirectMainDisplay; // For now
480     originalMode = CGDisplayCurrentMode(theDisplay);
481    
482     newMode = CGDisplayBestModeForParameters(theDisplay,
483     bits_from_depth(mode.depth),
484     mode.x, mode.y, NULL);
485     if ( NULL == newMode )
486     {
487     ErrorAlert("Could not find a matching screen mode");
488     return false;
489     }
490    
491     [the_win miniaturize: nil];
492     // [the_win setLevel: CGShieldingWindowLevel()];
493     the_win = nil;
494    
495     HideMenuBar();
496    
497     CGDisplayCapture(theDisplay);
498    
499     if ( CGDisplaySwitchToMode(theDisplay, newMode) != CGDisplayNoErr )
500     {
501     ErrorAlert("Could not switch to matching screen mode");
502     return false;
503     }
504    
505     CGDisplayHideCursor(theDisplay);
506    
507     the_buffer = CGDisplayBaseAddress(theDisplay);
508     if ( the_buffer == NULL )
509     {
510     ErrorAlert("Could not get base address of screen");
511     return false;
512     }
513    
514     screen_height = mode.y; // For mouse co-ordinate flipping
515    
516     // Send emulated mouse to current location
517    
518     NSPoint mouse = [NSEvent mouseLocation];
519     ADBMouseMoved((int)mouse.x, screen_height - (int)mouse.y);
520    
521     // Set VideoMonitor
522     VideoMonitor.mode = mode;
523     set_mac_frame_buffer(mode.depth);
524    
525     return true;
526     }
527    
528    
529     static bool init_opengl(const video_mode &mode)
530     {
531     ErrorAlert("Sorry. OpenGL mode is not implemented yet");
532     return false;
533     }
534    
535     /*
536     * Initialization
537     */
538    
539     bool VideoInit(bool classic)
540     {
541     // Read frame skip prefs
542     frame_skip = PrefsFindInt32("frameskip");
543     if (frame_skip == 0)
544     frame_skip = 1;
545    
546     // Get screen mode from preferences
547     const char *mode_str;
548     if (classic)
549     mode_str = "win/512/342";
550     else
551     mode_str = PrefsFindString("screen");
552    
553     // Determine display_type and init_width, height & depth
554     parse_screen_prefs(mode_str);
555    
556     // Construct list of supported modes
557     if (classic)
558     add_mode(512, 342, 0x80, 64, VDEPTH_1BIT);
559     else
560     switch ( display_type )
561     {
562     case DISPLAY_SCREEN:
563     if ( ! add_CGDirectDisplay_modes() )
564     {
565     ErrorAlert("Unable to get list of displays for full screen mode");
566     return false;
567     }
568     break;
569     case DISPLAY_OPENGL:
570     // Same as window depths and sizes?
571     case DISPLAY_WINDOW:
572     //add_standard_modes(VDEPTH_1BIT);
573     //add_standard_modes(VDEPTH_8BIT);
574     //add_standard_modes(VDEPTH_16BIT);
575     add_standard_modes(VDEPTH_32BIT);
576     break;
577     }
578    
579     video_init_depth_list();
580    
581     #if DEBUG
582     bug("Available video modes:\n");
583     vector<video_mode>::const_iterator i, end = VideoModes.end();
584     for (i = VideoModes.begin(); i != end; ++i)
585     bug(" %dx%d (ID %02x), %s\n", i->x, i->y, i->resolution_id,
586     colours_from_depth(i->depth));
587     #endif
588    
589     D(bug("VideoInit: width=%hd height=%hd depth=%ld\n",
590     init_width, init_height, init_depth));
591    
592     // Find requested default mode and open display
593     if (VideoModes.size() > 0)
594     {
595     // Find mode with specified dimensions
596     std::vector<video_mode>::const_iterator i, end = VideoModes.end();
597     for (i = VideoModes.begin(); i != end; ++i)
598     {
599     D(bug("VideoInit: w=%ld h=%ld d=%ld\n",
600     i->x, i->y, bits_from_depth(i->depth)));
601     if (i->x == init_width && i->y == init_height
602     && bits_from_depth(i->depth) == init_depth)
603     return video_open(*i);
604     }
605     }
606    
607     char str[150];
608     sprintf(str, "Cannot open selected video mode\r(%hd x %hd, %s).\r%s",
609     init_width, init_height,
610     colours_from_depth(init_depth), "Using lowest resolution");
611     WarningAlert(str);
612    
613     return video_open(VideoModes[0]);
614     }
615    
616    
617     // Open display for specified mode
618     static bool video_open(const video_mode &mode)
619     {
620     D(bug("video_open: width=%ld height=%ld depth=%ld bytes_per_row=%ld\n",
621     mode.x, mode.y, bits_from_depth(mode.depth), mode.bytes_per_row));
622    
623     // Open display
624     switch ( display_type ) {
625     case DISPLAY_WINDOW:
626     if ( ! init_window(mode) )
627     return false;
628     break;
629    
630     case DISPLAY_SCREEN:
631     if ( ! init_screen(mode) )
632     return false;
633     break;
634    
635     case DISPLAY_OPENGL:
636     if ( ! init_opengl(mode) )
637     return false;
638     break;
639     }
640    
641     return true;
642     }
643    
644    
645     static void video_close()
646     {
647     D(bug("video_close()\n"));
648    
649     switch ( display_type ) {
650     case DISPLAY_WINDOW:
651     // Stop redraw thread
652     [output disableDrawing];
653    
654     // Free frame buffer stuff
655     #ifdef CGIMAGEREF
656     CGImageRelease(imageRef);
657     #endif
658     #ifdef NSBITMAP
659     [bitmap release];
660     #endif
661     free(the_buffer);
662    
663     break;
664    
665     case DISPLAY_SCREEN:
666     if ( theDisplay && originalMode )
667     {
668     //CGDisplayShowCursor(theDisplay);
669     CGDisplaySwitchToMode(theDisplay, originalMode);
670     CGDisplayRelease(theDisplay);
671     ShowMenuBar();
672     }
673     break;
674    
675     case DISPLAY_OPENGL:
676     break;
677     }
678     }
679    
680    
681     /*
682     * Deinitialization
683     */
684    
685     void VideoExit(void)
686     {
687     video_close();
688     }
689    
690    
691     /*
692     * Set palette
693     */
694    
695     void video_set_palette(uint8 *pal, int num)
696     {
697     if ( FULLSCREEN && CGDisplayCanSetPalette(theDisplay)
698     && ! IsDirectMode(VideoMonitor.mode) )
699     {
700     CGDirectPaletteRef CGpal;
701     CGDisplayErr err;
702    
703    
704     CGpal = CGPaletteCreateWithByteSamples((CGDeviceByteColor *)pal, num);
705     err = CGDisplaySetPalette(theDisplay, CGpal);
706     if ( err != noErr )
707     NSLog(@"Failed to set palette, error = %d", err);
708     CGPaletteRelease(CGpal);
709     }
710     }
711    
712    
713     /*
714     * Switch video mode
715     */
716    
717     void video_switch_to_mode(const video_mode &mode)
718     {
719     // Close and reopen display
720     video_close();
721     if (!video_open(mode))
722     {
723     if ( display_type == DISPLAY_SCREEN )
724     ErrorAlert("Cannot switch screen to selected video mode");
725     else
726     ErrorAlert(STR_OPEN_WINDOW_ERR);
727     QuitEmulator();
728     }
729     }
730    
731     /*
732     * Close down full-screen mode
733     * (if bringing up error alerts is unsafe while in full-screen mode)
734     */
735    
736     void VideoQuitFullScreen(void)
737     {
738     }
739    
740    
741     /*
742     * Mac VBL interrupt
743     */
744    
745     void VideoInterrupt(void)
746     {
747     }
748    
749    
750     // This function is called on non-threaded platforms from a timer interrupt
751     void VideoRefresh(void)
752     {
753     }