git.sesse.net Git - vlc/blob - modules/video_output/macosx.m

   1 /*****************************************************************************
   2  * macosx.m: MacOS X OpenGL provider
   3  *****************************************************************************
   4  * Copyright (C) 2001-2012 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Colin Delacroix <colin@zoy.org>
   8  *          Florian G. Pflug <fgp@phlo.org>
   9  *          Jon Lech Johansen <jon-vl@nanocrew.net>
  10  *          Derk-Jan Hartman <hartman at videolan dot org>
  11  *          Eric Petit <titer@m0k.org>
  12  *          Benjamin Pracht <bigben at videolan dot org>
  13  *          Damien Fouilleul <damienf at videolan dot org>
  14  *          Pierre d'Herbemont <pdherbemont at videolan dot org>
  15  *          Felix Paul Kühne <fkuehne at videolan dot org>
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  30  *****************************************************************************/
  31
  32 /*****************************************************************************
  33  * Preamble
  34  *****************************************************************************/
  35
  36 #import <Cocoa/Cocoa.h>
  37 #import <OpenGL/OpenGL.h>
  38
  39 #ifdef HAVE_CONFIG_H
  40 # include "config.h"
  41 #endif
  42
  43 #include <vlc_common.h>
  44 #include <vlc_plugin.h>
  45 #include <vlc_vout_display.h>
  46 #include <vlc_opengl.h>
  47 #include <vlc_dialog.h>
  48 #include "opengl.h"
  49
  50 @interface NSWindow (VLCCustomCode)
  51 - (BOOL)isFullscreen;
  52 @end
  53
  54 /**
  55  * Forward declarations
  56  */
  57 static int Open(vlc_object_t *);
  58 static void Close(vlc_object_t *);
  59
  60 static picture_pool_t *Pool(vout_display_t *vd, unsigned requested_count);
  61 static void PictureRender(vout_display_t *vd, picture_t *pic, subpicture_t *subpicture);
  62 static void PictureDisplay(vout_display_t *vd, picture_t *pic, subpicture_t *subpicture);
  63 static int Control (vout_display_t *vd, int query, va_list ap);
  64
  65 static int OpenglLock(vlc_gl_t *gl);
  66 static void OpenglUnlock(vlc_gl_t *gl);
  67 static void OpenglSwap(vlc_gl_t *gl);
  68
  69 /**
  70  * Module declaration
  71  */
  72 vlc_module_begin ()
  73     /* Will be loaded even without interface module. see voutgl.m */
  74     set_shortname("Mac OS X")
  75     set_description( N_("Mac OS X OpenGL video output (requires drawable-nsobject)"))
  76     set_category(CAT_VIDEO)
  77     set_subcategory(SUBCAT_VIDEO_VOUT )
  78     set_capability("vout display", 300)
  79     set_callbacks(Open, Close)
  80
  81     add_shortcut("macosx", "vout_macosx")
  82 vlc_module_end ()
  83
  84 /**
  85  * Obj-C protocol declaration that drawable-nsobject should follow
  86  */
  87 @protocol VLCOpenGLVideoViewEmbedding <NSObject>
  88 - (void)addVoutSubview:(NSView *)view;
  89 - (void)removeVoutSubview:(NSView *)view;
  90 @end
  91
  92 @interface VLCOpenGLVideoView : NSOpenGLView
  93 {
  94     vout_display_t *vd;
  95     BOOL _hasPendingReshape;
  96 }
  97 - (void)setVoutDisplay:(vout_display_t *)vd;
  98 - (vout_display_t *)voutDisplay;
  99 - (void)setVoutFlushing:(BOOL)flushing;
 100 @end
 101
 102
 103 struct vout_display_sys_t
 104 {
 105     VLCOpenGLVideoView *glView;
 106     id<VLCOpenGLVideoViewEmbedding> container;
 107
 108     vout_window_t *embed;
 109     vlc_gl_t gl;
 110     vout_display_opengl_t *vgl;
 111
 112     picture_pool_t *pool;
 113     picture_t *current;
 114     bool has_first_frame;
 115 };
 116
 117 static int Open(vlc_object_t *this)
 118 {
 119     vout_display_t *vd = (vout_display_t *)this;
 120     vout_display_sys_t *sys = calloc(1, sizeof(*sys));
 121     NSAutoreleasePool *nsPool = nil;
 122
 123     if (!sys)
 124         return VLC_ENOMEM;
 125
 126     if( !CGDisplayUsesOpenGLAcceleration( kCGDirectMainDisplay ) )
 127     {
 128         msg_Err( this, "no OpenGL hardware acceleration found, video output will fail" );
 129         dialog_Fatal( this, _("Video output is not supported"), _("Your Mac lacks Quartz Extreme acceleration, which is required for video output.") );
 130         return VLC_EGENERIC;
 131     }
 132     else
 133         msg_Dbg( this, "Quartz Extreme acceleration is active" );
 134
 135     vd->sys = sys;
 136     sys->pool = NULL;
 137     sys->gl.sys = NULL;
 138     sys->embed = NULL;
 139
 140     /* Get the drawable object */
 141     id container = var_CreateGetAddress(vd, "drawable-nsobject");
 142     if (container)
 143     {
 144         vout_display_DeleteWindow(vd, NULL);
 145     }
 146     else
 147     {
 148         vout_window_cfg_t wnd_cfg;
 149
 150         memset (&wnd_cfg, 0, sizeof (wnd_cfg));
 151         wnd_cfg.type = VOUT_WINDOW_TYPE_NSOBJECT;
 152         wnd_cfg.x = var_InheritInteger (vd, "video-x");
 153         wnd_cfg.y = var_InheritInteger (vd, "video-y");
 154         wnd_cfg.width  = vd->cfg->display.width;
 155         wnd_cfg.height = vd->cfg->display.height;
 156
 157         sys->embed = vout_display_NewWindow (vd, &wnd_cfg);
 158         if (sys->embed)
 159             container = sys->embed->handle.nsobject;
 160
 161         if (!container)
 162         {
 163             msg_Dbg(vd, "No drawable-nsobject nor vout_window_t found, passing over.");
 164             goto error;
 165         }
 166     }
 167
 168     /* This will be released in Close(), on
 169      * main thread, after we are done using it. */
 170     sys->container = [container retain];
 171
 172     /* Get our main view*/
 173     nsPool = [[NSAutoreleasePool alloc] init];
 174
 175     [VLCOpenGLVideoView performSelectorOnMainThread:@selector(getNewView:) withObject:[NSValue valueWithPointer:&sys->glView] waitUntilDone:YES];
 176     if (!sys->glView)
 177         goto error;
 178
 179     [sys->glView setVoutDisplay:vd];
 180
 181     /* We don't wait, that means that we'll have to be careful about releasing
 182      * container.
 183      * That's why we'll release on main thread in Close(). */
 184     if ([(id)container respondsToSelector:@selector(addVoutSubview:)])
 185         [(id)container performSelectorOnMainThread:@selector(addVoutSubview:) withObject:sys->glView waitUntilDone:NO];
 186     else if ([container isKindOfClass:[NSView class]])
 187     {
 188         NSView *parentView = container;
 189         [parentView performSelectorOnMainThread:@selector(addSubview:) withObject:sys->glView waitUntilDone:NO];
 190         [sys->glView performSelectorOnMainThread:@selector(setFrameWithValue:) withObject:[NSValue valueWithRect:[parentView bounds]] waitUntilDone:NO];
 191     }
 192     else
 193     {
 194         msg_Err(vd, "Invalid drawable-nsobject object. drawable-nsobject must either be an NSView or comply to the @protocol VLCOpenGLVideoViewEmbedding.");
 195         goto error;
 196     }
 197
 198
 199     [nsPool release];
 200     nsPool = nil;
 201
 202     /* Initialize common OpenGL video display */
 203     sys->gl.lock = OpenglLock;
 204     sys->gl.unlock = OpenglUnlock;
 205     sys->gl.swap = OpenglSwap;
 206     sys->gl.getProcAddress = NULL;
 207     sys->gl.sys = sys;
 208     const vlc_fourcc_t *subpicture_chromas;
 209     video_format_t fmt = vd->fmt;
 210
 211     sys->vgl = vout_display_opengl_New(&vd->fmt, &subpicture_chromas, &sys->gl);
 212     if (!sys->vgl)
 213     {
 214         sys->gl.sys = NULL;
 215         goto error;
 216     }
 217
 218     /* */
 219     vout_display_info_t info = vd->info;
 220     info.has_pictures_invalid = false;
 221     info.has_event_thread = true;
 222     info.subpicture_chromas = subpicture_chromas;
 223
 224     /* Setup vout_display_t once everything is fine */
 225     vd->info = info;
 226
 227     vd->pool = Pool;
 228     vd->prepare = PictureRender;
 229     vd->display = PictureDisplay;
 230     vd->control = Control;
 231
 232     /* */
 233     vout_display_SendEventFullscreen (vd, false);
 234     vout_display_SendEventDisplaySize (vd, vd->source.i_visible_width, vd->source.i_visible_height, false);
 235
 236     return VLC_SUCCESS;
 237
 238 error:
 239     [nsPool release];
 240     Close(this);
 241     return VLC_EGENERIC;
 242 }
 243
 244 void Close(vlc_object_t *this)
 245 {
 246     vout_display_t *vd = (vout_display_t *)this;
 247     vout_display_sys_t *sys = vd->sys;
 248
 249     if ([[sys->glView window] level] != NSNormalWindowLevel)
 250         [[sys->glView window] setLevel: NSNormalWindowLevel];
 251
 252     [sys->glView setVoutDisplay:nil];
 253
 254     var_Destroy(vd, "drawable-nsobject");
 255     if ([(id)sys->container respondsToSelector:@selector(removeVoutSubview:)])
 256     {
 257         /* This will retain sys->glView */
 258         [(id)sys->container performSelectorOnMainThread:@selector(removeVoutSubview:) withObject:sys->glView waitUntilDone:NO];
 259     }
 260     /* release on main thread as explained in Open() */
 261     [(id)sys->container performSelectorOnMainThread:@selector(release) withObject:nil waitUntilDone:NO];
 262     [sys->glView performSelectorOnMainThread:@selector(removeFromSuperview) withObject:nil waitUntilDone:NO];
 263
 264     [sys->glView release];
 265
 266     if (sys->gl.sys != NULL)
 267         vout_display_opengl_Delete(sys->vgl);
 268
 269     if (sys->embed)
 270         vout_display_DeleteWindow(vd, sys->embed);
 271     free (sys);
 272 }
 273
 274 /*****************************************************************************
 275  * vout display callbacks
 276  *****************************************************************************/
 277
 278 static picture_pool_t *Pool(vout_display_t *vd, unsigned requested_count)
 279 {
 280     vout_display_sys_t *sys = vd->sys;
 281
 282     if (!sys->pool)
 283         sys->pool = vout_display_opengl_GetPool (sys->vgl, requested_count);
 284     assert(sys->pool);
 285     return sys->pool;
 286 }
 287
 288 static void PictureRender(vout_display_t *vd, picture_t *pic, subpicture_t *subpicture)
 289 {
 290
 291     vout_display_sys_t *sys = vd->sys;
 292
 293     vout_display_opengl_Prepare( sys->vgl, pic, subpicture );
 294 }
 295
 296 static void PictureDisplay(vout_display_t *vd, picture_t *pic, subpicture_t *subpicture)
 297 {
 298     vout_display_sys_t *sys = vd->sys;
 299     [sys->glView setVoutFlushing:YES];
 300     vout_display_opengl_Display(sys->vgl, &vd->fmt );
 301     [sys->glView setVoutFlushing:NO];
 302     picture_Release (pic);
 303     sys->has_first_frame = true;
 304
 305     if (subpicture)
 306         subpicture_Delete(subpicture);
 307 }
 308
 309 static int Control (vout_display_t *vd, int query, va_list ap)
 310 {
 311     vout_display_sys_t *sys = vd->sys;
 312
 313     switch (query)
 314     {
 315         case VOUT_DISPLAY_CHANGE_FULLSCREEN:
 316         {
 317             NSAutoreleasePool * o_pool = [[NSAutoreleasePool alloc] init];
 318             [[sys->glView window] performSelectorOnMainThread:@selector(fullscreen:) withObject: nil waitUntilDone:NO];
 319             [o_pool release];
 320             return VLC_SUCCESS;
 321         }
 322         case VOUT_DISPLAY_CHANGE_WINDOW_STATE:
 323         {
 324             NSAutoreleasePool * o_pool = [[NSAutoreleasePool alloc] init];
 325             unsigned state = va_arg (ap, unsigned);
 326             [sys->glView performSelectorOnMainThread:@selector(setWindowLevel:) withObject:[NSNumber numberWithUnsignedInt:state] waitUntilDone:NO];
 327             [o_pool release];
 328             return VLC_SUCCESS;
 329         }
 330         case VOUT_DISPLAY_CHANGE_DISPLAY_FILLED:
 331         case VOUT_DISPLAY_CHANGE_ZOOM:
 332         case VOUT_DISPLAY_CHANGE_SOURCE_ASPECT:
 333         case VOUT_DISPLAY_CHANGE_SOURCE_CROP:
 334         case VOUT_DISPLAY_CHANGE_DISPLAY_SIZE:
 335         {
 336             if (!vd->sys)
 337                 return VLC_EGENERIC;
 338
 339             NSAutoreleasePool * o_pool = [[NSAutoreleasePool alloc] init];
 340             NSPoint topleftbase;
 341             NSPoint topleftscreen;
 342             NSRect new_frame;
 343             const vout_display_cfg_t *cfg;
 344             int i_width = 0;
 345             int i_height = 0;
 346
 347             id o_window = [sys->glView window];
 348             if (!o_window)
 349                 return VLC_SUCCESS; // this is okay, since the event will occur again when we have a window
 350             NSRect windowFrame = [o_window frame];
 351             NSRect glViewFrame = [sys->glView frame];
 352             NSRect screenFrame = [[o_window screen] visibleFrame];
 353             NSSize windowMinSize = [o_window minSize];
 354
 355             topleftbase.x = 0;
 356             topleftbase.y = windowFrame.size.height;
 357             topleftscreen = [o_window convertBaseToScreen: topleftbase];
 358
 359             if (query == VOUT_DISPLAY_CHANGE_SOURCE_CROP || query == VOUT_DISPLAY_CHANGE_SOURCE_ASPECT)
 360             {
 361                 const video_format_t *source;
 362
 363                 source = (const video_format_t *)va_arg (ap, const video_format_t *);
 364                 cfg = vd->cfg;
 365
 366                 vout_display_place_t place;
 367                 vout_display_PlacePicture (&place, source, cfg, false);
 368
 369                 vd->fmt.i_width  = vd->source.i_width  * place.width  / vd->source.i_visible_width;
 370                 vd->fmt.i_height = vd->source.i_height * place.height / vd->source.i_visible_height;
 371                 vd->fmt.i_visible_width  = vd->source.i_visible_width;
 372                 vd->fmt.i_visible_height = vd->source.i_visible_height;
 373                 vd->fmt.i_x_offset = vd->source.i_x_offset * place.width  / vd->source.i_visible_width;
 374                 vd->fmt.i_y_offset = vd->source.i_y_offset * place.height / vd->source.i_visible_height;
 375
 376                 i_width = place.width;
 377                 i_height = place.height;
 378
 379                 if (vd->fmt.i_x_offset > 0)
 380                 {
 381                     if (vd->source.i_width / vd->fmt.i_x_offset <= 4)
 382                     {
 383                         /* hack and special case for the "Default" state
 384                          * The 'Default' state tries to set the dimensions with a huge x offset and a weird
 385                          * width / height ratio, which definitely isn't the default for the played media.
 386                          * That's why, we enforce the media's actual dimensions here.
 387                          * The quotient of 4 is a stochastic value, which isn't reached by any other crop state. */
 388                         vd->fmt.i_width  = vd->source.i_width;
 389                         vd->fmt.i_height = vd->source.i_height;
 390                         vd->fmt.i_visible_width  = vd->source.i_width;
 391                         vd->fmt.i_visible_height = vd->source.i_height;
 392                         vd->fmt.i_x_offset = 0;
 393                         vd->fmt.i_y_offset = 0;
 394                         i_width = vd->source.i_width;
 395                         i_height = vd->source.i_height;
 396                     }
 397                 }
 398
 399                 glViewport (0, 0, i_width, i_height);
 400             }
 401             else
 402             {
 403                 cfg = (const vout_display_cfg_t*)va_arg (ap, const vout_display_cfg_t *);
 404                 i_width = cfg->display.width;
 405                 i_height = cfg->display.height;
 406             }
 407
 408             /* Calculate the window's new size, if it is larger than our minimal size */
 409             if (i_width < windowMinSize.width)
 410                 i_width = windowMinSize.width;
 411             if (i_height < windowMinSize.height)
 412                 i_height = windowMinSize.height;
 413
 414             // is needed in the case we do not an actual resize
 415             [sys->glView performSelectorOnMainThread:@selector(reshapeView:) withObject:nil waitUntilDone:NO];
 416
 417             if (config_GetInt (vd, "macosx-video-autoresize") && query == VOUT_DISPLAY_CHANGE_DISPLAY_SIZE &&
 418                 (i_height != glViewFrame.size.height || i_width != glViewFrame.size.width))
 419             {
 420                 new_frame.size.width = windowFrame.size.width - glViewFrame.size.width + i_width;
 421                 new_frame.size.height = windowFrame.size.height - glViewFrame.size.height + i_height;
 422
 423                 new_frame.origin.x = topleftscreen.x;
 424                 new_frame.origin.y = topleftscreen.y - new_frame.size.height;
 425
 426                 /* make sure the window doesn't exceed the screen size the window is on */
 427                 if( new_frame.size.width > screenFrame.size.width )
 428                 {
 429                     new_frame.size.width = screenFrame.size.width;
 430                     new_frame.origin.x = screenFrame.origin.x;
 431                 }
 432                 if( new_frame.size.height > screenFrame.size.height )
 433                 {
 434                     new_frame.size.height = screenFrame.size.height;
 435                     new_frame.origin.y = screenFrame.origin.y;
 436                 }
 437                 if( new_frame.origin.y < screenFrame.origin.y )
 438                     new_frame.origin.y = screenFrame.origin.y;
 439
 440                 [sys->glView performSelectorOnMainThread:@selector(setWindowFrameWithValue:) withObject:[NSValue valueWithRect:new_frame] waitUntilDone:NO];
 441             }
 442             [o_pool release];
 443             return VLC_SUCCESS;
 444         }
 445
 446         case VOUT_DISPLAY_HIDE_MOUSE:
 447         {
 448             [NSCursor setHiddenUntilMouseMoves: YES];
 449             return VLC_SUCCESS;
 450         }
 451
 452         case VOUT_DISPLAY_GET_OPENGL:
 453         {
 454             vlc_gl_t **gl = va_arg (ap, vlc_gl_t **);
 455             *gl = &sys->gl;
 456             return VLC_SUCCESS;
 457         }
 458
 459         case VOUT_DISPLAY_RESET_PICTURES:
 460             assert (0);
 461         default:
 462             msg_Err (vd, "Unknown request in Mac OS X vout display");
 463             return VLC_EGENERIC;
 464     }
 465 }
 466
 467 /*****************************************************************************
 468  * vout opengl callbacks
 469  *****************************************************************************/
 470 static int OpenglLock(vlc_gl_t *gl)
 471 {
 472     vout_display_sys_t *sys = (vout_display_sys_t *)gl->sys;
 473     NSOpenGLContext *context = [sys->glView openGLContext];
 474     CGLError err = CGLLockContext([context CGLContextObj]);
 475     if (kCGLNoError == err)
 476     {
 477         [context makeCurrentContext];
 478         return 0;
 479     }
 480     return 1;
 481 }
 482
 483 static void OpenglUnlock(vlc_gl_t *gl)
 484 {
 485     vout_display_sys_t *sys = (vout_display_sys_t *)gl->sys;
 486     CGLUnlockContext([[sys->glView openGLContext] CGLContextObj]);
 487 }
 488
 489 static void OpenglSwap(vlc_gl_t *gl)
 490 {
 491     vout_display_sys_t *sys = (vout_display_sys_t *)gl->sys;
 492     [[sys->glView openGLContext] flushBuffer];
 493 }
 494
 495 /*****************************************************************************
 496  * Our NSView object
 497  *****************************************************************************/
 498 @implementation VLCOpenGLVideoView
 499
 500 #define VLCAssertMainThread() assert([[NSThread currentThread] isMainThread])
 501
 502 + (void)getNewView:(NSValue *)value
 503 {
 504     id *ret = [value pointerValue];
 505     *ret = [[self alloc] init];
 506 }
 507
 508 /**
 509  * Gets called by the Open() method.
 510  */
 511 - (id)init
 512 {
 513     VLCAssertMainThread();
 514
 515     /* Warning - this may be called on non main thread */
 516
 517     NSOpenGLPixelFormatAttribute attribs[] =
 518     {
 519         NSOpenGLPFADoubleBuffer,
 520         NSOpenGLPFAAccelerated,
 521         NSOpenGLPFANoRecovery,
 522         NSOpenGLPFAColorSize, 24,
 523         NSOpenGLPFAAlphaSize, 8,
 524         NSOpenGLPFADepthSize, 24,
 525         NSOpenGLPFAWindow,
 526         0
 527     };
 528
 529     NSOpenGLPixelFormat *fmt = [[NSOpenGLPixelFormat alloc] initWithAttributes:attribs];
 530
 531     if (!fmt)
 532         return nil;
 533
 534     self = [super initWithFrame:NSMakeRect(0,0,10,10) pixelFormat:fmt];
 535     [fmt release];
 536
 537     if (!self)
 538         return nil;
 539
 540     /* Swap buffers only during the vertical retrace of the monitor.
 541      http://developer.apple.com/documentation/GraphicsImaging/
 542      Conceptual/OpenGL/chap5/chapter_5_section_44.html */
 543     GLint params[] = { 1 };
 544     CGLSetParameter([[self openGLContext] CGLContextObj], kCGLCPSwapInterval, params);
 545
 546     [self setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
 547     return self;
 548 }
 549
 550 /**
 551  * Gets called by the Open() method.
 552  */
 553 - (void)setFrameWithValue:(NSValue *)value
 554 {
 555     [self setFrame:[value rectValue]];
 556 }
 557
 558 /**
 559  * Gets called by Control() to make sure that we're performing on the main thread
 560  */
 561 - (void)setWindowFrameWithValue:(NSValue *)value
 562 {
 563     if (![[self window] isFullscreen])
 564     {
 565         NSRect frame = [value rectValue];
 566         [[self window] setFrame:frame display:YES animate: YES];
 567     }
 568 }
 569
 570 /**
 571  * Gets called by the Close and Open methods.
 572  * (Non main thread).
 573  */
 574 - (void)setVoutDisplay:(vout_display_t *)aVd
 575 {
 576     @synchronized(self) {
 577         vd = aVd;
 578     }
 579 }
 580
 581 - (vout_display_t *)voutDisplay
 582 {
 583     return vd;
 584 }
 585
 586 /**
 587  * Gets called when the vout will aquire the lock and flush.
 588  * (Non main thread).
 589  */
 590 - (void)setVoutFlushing:(BOOL)flushing
 591 {
 592     if (!flushing)
 593         return;
 594     @synchronized(self) {
 595         _hasPendingReshape = NO;
 596     }
 597 }
 598
 599 /**
 600  * Can -drawRect skip rendering?.
 601  */
 602 - (BOOL)canSkipRendering
 603 {
 604     VLCAssertMainThread();
 605
 606     @synchronized(self) {
 607         BOOL hasFirstFrame = vd && vd->sys->has_first_frame;
 608         return !_hasPendingReshape && hasFirstFrame;
 609     }
 610 }
 611
 612
 613 /**
 614  * Local method that locks the gl context.
 615  */
 616 - (BOOL)lockgl
 617 {
 618     VLCAssertMainThread();
 619     NSOpenGLContext *context = [self openGLContext];
 620     CGLError err = CGLLockContext([context CGLContextObj]);
 621     if (err == kCGLNoError)
 622         [context makeCurrentContext];
 623     return err == kCGLNoError;
 624 }
 625
 626 /**
 627  * Local method that unlocks the gl context.
 628  */
 629 - (void)unlockgl
 630 {
 631     VLCAssertMainThread();
 632     CGLUnlockContext([[self openGLContext] CGLContextObj]);
 633 }
 634
 635 /**
 636  * Local method that force a rendering of a frame.
 637  * This will get called if Cocoa forces us to redraw (via -drawRect).
 638  */
 639 - (void)render
 640 {
 641     VLCAssertMainThread();
 642
 643     // We may have taken some times to take the opengl Lock.
 644     // Check here to see if we can just skip the frame as well.
 645     if ([self canSkipRendering])
 646         return;
 647
 648     BOOL hasFirstFrame;
 649     @synchronized(self) { // vd can be accessed from multiple threads
 650         hasFirstFrame = vd && vd->sys->has_first_frame;
 651     }
 652
 653     if (hasFirstFrame) {
 654         // This will lock gl.
 655         vout_display_opengl_Display( vd->sys->vgl, &vd->source );
 656     }
 657     else
 658         glClear(GL_COLOR_BUFFER_BIT);
 659 }
 660
 661 - (void)reshapeView:(id)sender
 662 {
 663     [self reshape];
 664 }
 665
 666 /**
 667  * Method called by Cocoa when the view is resized.
 668  */
 669 - (void)reshape
 670 {
 671     VLCAssertMainThread();
 672
 673     NSRect bounds = [self bounds];
 674
 675     CGFloat height, width;
 676     if( !vd || ( vd && vd->cfg->is_display_filled ))
 677     {
 678         height = bounds.size.height;
 679         width = bounds.size.width;
 680     }
 681     else
 682     {
 683         height = vd->source.i_visible_height;
 684         width = vd->source.i_visible_width;
 685     }
 686
 687     GLint x = width, y = height;
 688
 689     @synchronized(self) {
 690         if (vd) {
 691             CGFloat videoHeight = vd->source.i_visible_height;
 692             CGFloat videoWidth = vd->source.i_visible_width;
 693
 694             GLint sarNum = vd->source.i_sar_num;
 695             GLint sarDen = vd->source.i_sar_den;
 696
 697             if (height * videoWidth * sarNum < width * videoHeight * sarDen)
 698             {
 699                 x = (height * videoWidth * sarNum) / (videoHeight * sarDen);
 700                 y = height;
 701             }
 702             else
 703             {
 704                 x = width;
 705                 y = (width * videoHeight * sarDen) / (videoWidth * sarNum);
 706             }
 707         }
 708     }
 709
 710     if ([self lockgl]) {
 711         glViewport((bounds.size.width - x) / 2, (bounds.size.height - y) / 2, x, y);
 712
 713         @synchronized(self) {
 714             // This may be cleared before -drawRect is being called,
 715             // in this case we'll skip the rendering.
 716             // This will save us for rendering two frames (or more) for nothing
 717             // (one by the vout, one (or more) by drawRect)
 718             _hasPendingReshape = YES;
 719         }
 720
 721         [self unlockgl];
 722
 723         [super reshape];
 724     }
 725 }
 726
 727 /**
 728  * Method called by Cocoa when the view is resized or the location has changed.
 729  * We just need to make sure we are locking here.
 730  */
 731 - (void)update
 732 {
 733     VLCAssertMainThread();
 734     BOOL success = [self lockgl];
 735     if (!success)
 736         return;
 737
 738     [super update];
 739
 740     [self unlockgl];
 741 }
 742
 743 /**
 744  * Method called by Cocoa to force redraw.
 745  */
 746 - (void)drawRect:(NSRect) rect
 747 {
 748     VLCAssertMainThread();
 749
 750     if ([self canSkipRendering])
 751         return;
 752
 753     BOOL success = [self lockgl];
 754     if (!success)
 755         return;
 756
 757     [self render];
 758
 759     [self unlockgl];
 760 }
 761
 762 - (void)renewGState
 763 {
 764     NSWindow *window = [self window];
 765
 766     // Remove flashes with splitter view.
 767     if ([window respondsToSelector:@selector(disableScreenUpdatesUntilFlush)])
 768         [window disableScreenUpdatesUntilFlush];
 769
 770     [super renewGState];
 771 }
 772
 773 - (BOOL)mouseDownCanMoveWindow
 774 {
 775     return YES;
 776 }
 777
 778 - (BOOL)isOpaque
 779 {
 780     return YES;
 781 }
 782
 783 - (void)setWindowLevel:(NSNumber*)state
 784 {
 785     if( [state unsignedIntValue] & VOUT_WINDOW_STATE_ABOVE )
 786         [[self window] setLevel: NSStatusWindowLevel];
 787     else
 788         [[self window] setLevel: NSNormalWindowLevel];
 789 }
 790 @end