src/osx/iphone/glcanvas.mm

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/osx/iphone/glcanvas.mm
   3 // Purpose:     wxGLCanvas, for using OpenGL with wxWidgets under iPhone
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     1998-01-01
   7 // RCS-ID:      $Id: glcanvas.cpp 54129 2008-06-11 19:30:52Z SC $
   8 // Copyright:   (c) Stefan Csomor
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #if defined(__BORLANDC__)
  23     #pragma hdrstop
  24 #endif
  25
  26 #if wxUSE_GLCANVAS
  27
  28 #include "wx/glcanvas.h"
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/frame.h"
  32     #include "wx/log.h"
  33     #include "wx/settings.h"
  34 #endif
  35
  36 #include "wx/osx/private.h"
  37
  38 #import <OpenGLES/EAGL.h>
  39 #import <OpenGLES/EAGLDrawable.h>
  40 #import <QuartzCore/QuartzCore.h>
  41
  42 // a lot of the code is from the OpenGL ES Template
  43
  44 // can be turned on for ES 2.0 only
  45 #define USE_DEPTH_BUFFER 0
  46
  47 @interface wxUICustomOpenGLView : UIView
  48 {
  49     EAGLContext* context;
  50
  51     /* The pixel dimensions of the backbuffer */
  52     GLint backingWidth;
  53     GLint backingHeight;
  54
  55     /* OpenGL names for the renderbuffer and framebuffers used to render to this view */
  56     GLuint viewRenderbuffer, viewFramebuffer;
  57
  58     /* OpenGL name for the depth buffer that is attached to viewFramebuffer, if it exists (0 if it does not exist) */
  59     GLuint depthRenderbuffer;
  60 }
  61
  62 - (BOOL) createFramebuffer;
  63 - (void) destroyFramebuffer;
  64
  65 @end
  66
  67 @implementation wxUICustomOpenGLView
  68
  69 + (Class)layerClass {
  70     return [CAEAGLLayer class];
  71 }
  72
  73 + (void)initialize
  74 {
  75     static BOOL initialized = NO;
  76     if (!initialized)
  77     {
  78         initialized = YES;
  79         wxOSXIPhoneClassAddWXMethods( self );
  80     }
  81 }
  82
  83 - (BOOL)isOpaque
  84 {
  85     return YES;
  86 }
  87
  88 - (BOOL)createFramebuffer {
  89
  90     glGenFramebuffersOES(1, &viewFramebuffer);
  91     glGenRenderbuffersOES(1, &viewRenderbuffer);
  92     glEnable(GL_CULL_FACE);
  93
  94     glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
  95     glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
  96     [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
  97     glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
  98
  99     glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
 100     glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
 101
 102     if (USE_DEPTH_BUFFER) {
 103         glGenRenderbuffersOES(1, &depthRenderbuffer);
 104         glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
 105         glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, backingWidth, backingHeight);
 106         glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
 107     }
 108
 109     if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
 110         NSLog(@"failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
 111         return NO;
 112     }
 113
 114     return YES;
 115 }
 116
 117
 118 - (void)destroyFramebuffer {
 119
 120     glDeleteFramebuffersOES(1, &viewFramebuffer);
 121     viewFramebuffer = 0;
 122     glDeleteRenderbuffersOES(1, &viewRenderbuffer);
 123     viewRenderbuffer = 0;
 124
 125     if(depthRenderbuffer) {
 126         glDeleteRenderbuffersOES(1, &depthRenderbuffer);
 127         depthRenderbuffer = 0;
 128     }
 129 }
 130
 131 - (void) setContext:(EAGLContext*) ctx {
 132     context = ctx;
 133     [EAGLContext setCurrentContext:ctx];
 134     [self destroyFramebuffer];
 135     [self createFramebuffer];
 136     glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
 137 }
 138
 139 - (void) swapBuffers {
 140     glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
 141     [context presentRenderbuffer:GL_RENDERBUFFER_OES];
 142 }
 143
 144 @end
 145
 146
 147 WXGLContext WXGLCreateContext( WXGLPixelFormat pixelFormat, WXGLContext shareContext )
 148 {
 149     WXGLContext context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
 150
 151     // [[EAGLContext alloc] initWithFormat:pixelFormat shareContext: shareContext];
 152     if ( !context )
 153         wxFAIL_MSG("NSOpenGLContext creation failed");
 154     return context ;
 155 }
 156
 157 void WXGLDestroyContext( WXGLContext context )
 158 {
 159     if ( context )
 160     {
 161         [context release];
 162     }
 163 }
 164
 165 WXGLContext WXGLGetCurrentContext()
 166 {
 167     return [EAGLContext currentContext];
 168 }
 169
 170 bool WXGLSetCurrentContext(WXGLContext context)
 171 {
 172     [EAGLContext setCurrentContext:context];
 173     return true;
 174 }
 175
 176 void WXGLDestroyPixelFormat( WXGLPixelFormat pixelFormat )
 177 {
 178 /*
 179     if ( pixelFormat )
 180     {
 181         [pixelFormat release];
 182     }
 183 */
 184 }
 185
 186
 187 WXGLPixelFormat WXGLChoosePixelFormat(const int *attribList)
 188 {
 189 #if 0
 190     NSOpenGLPixelFormatAttribute data[512];
 191     const NSOpenGLPixelFormatAttribute defaultAttribs[] =
 192     {
 193         NSOpenGLPFADoubleBuffer,
 194         NSOpenGLPFAMinimumPolicy,
 195         NSOpenGLPFAColorSize,(NSOpenGLPixelFormatAttribute)8,
 196         NSOpenGLPFAAlphaSize,(NSOpenGLPixelFormatAttribute)0,
 197         NSOpenGLPFADepthSize,(NSOpenGLPixelFormatAttribute)8,
 198         (NSOpenGLPixelFormatAttribute)nil
 199     };
 200
 201     const NSOpenGLPixelFormatAttribute *attribs;
 202     if ( !attribList )
 203     {
 204         attribs = defaultAttribs;
 205     }
 206     else
 207     {
 208         unsigned p = 0;
 209         data[p++] = NSOpenGLPFAMinimumPolicy; // make _SIZE tags behave more like GLX
 210
 211         for ( unsigned arg = 0; attribList[arg] !=0 && p < WXSIZEOF(data); )
 212         {
 213             switch ( attribList[arg++] )
 214             {
 215                 case WX_GL_RGBA:
 216                     //data[p++] = AGL_RGBA;
 217                     break;
 218
 219                 case WX_GL_BUFFER_SIZE:
 220                     //data[p++] = AGL_BUFFER_SIZE;
 221                     //data[p++] = attribList[arg++];
 222                     break;
 223
 224                 case WX_GL_LEVEL:
 225                     //data[p++]=AGL_LEVEL;
 226                     //data[p++]=attribList[arg++];
 227                     break;
 228
 229                 case WX_GL_DOUBLEBUFFER:
 230                     data[p++] = NSOpenGLPFADoubleBuffer;
 231                     break;
 232
 233                 case WX_GL_STEREO:
 234                     data[p++] = NSOpenGLPFAStereo;
 235                     break;
 236
 237                 case WX_GL_AUX_BUFFERS:
 238                     data[p++] = NSOpenGLPFAAuxBuffers;
 239                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 240                     break;
 241
 242                 case WX_GL_MIN_RED:
 243                     data[p++] = NSOpenGLPFAColorSize;
 244                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 245                     break;
 246
 247                 case WX_GL_MIN_GREEN:
 248                     //data[p++] = AGL_GREEN_SIZE;
 249                     //data[p++] = attribList[arg++];
 250                     break;
 251
 252                 case WX_GL_MIN_BLUE:
 253                     //data[p++] = AGL_BLUE_SIZE;
 254                     //data[p++] = attribList[arg++];
 255                     break;
 256
 257                 case WX_GL_MIN_ALPHA:
 258                     data[p++] = NSOpenGLPFAAlphaSize;
 259                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 260                     break;
 261
 262                 case WX_GL_DEPTH_SIZE:
 263                     data[p++] = NSOpenGLPFADepthSize;
 264                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 265                     break;
 266
 267                 case WX_GL_STENCIL_SIZE:
 268                     data[p++] = NSOpenGLPFAStencilSize;
 269                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 270                     break;
 271
 272                 case WX_GL_MIN_ACCUM_RED:
 273                     data[p++] = NSOpenGLPFAAccumSize;
 274                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 275                     break;
 276
 277                 case WX_GL_MIN_ACCUM_GREEN:
 278                     //data[p++] = AGL_ACCUM_GREEN_SIZE;
 279                     //data[p++] = attribList[arg++];
 280                     break;
 281
 282                 case WX_GL_MIN_ACCUM_BLUE:
 283                     //data[p++] = AGL_ACCUM_BLUE_SIZE;
 284                     //data[p++] = attribList[arg++];
 285                     break;
 286
 287                 case WX_GL_MIN_ACCUM_ALPHA:
 288                     //data[p++] = AGL_ACCUM_ALPHA_SIZE;
 289                     //data[p++] = attribList[arg++];
 290                     break;
 291
 292                 case WX_GL_SAMPLE_BUFFERS:
 293                     if ( !wxGLCanvas::IsAGLMultiSampleAvailable() )
 294                     {
 295                         if ( !attribList[arg++] )
 296                             break;
 297
 298                         return false;
 299                     }
 300
 301                     data[p++] = NSOpenGLPFASampleBuffers;
 302                     if ( (data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++]) == true )
 303                     {
 304                         // don't use software fallback
 305                         data[p++] = NSOpenGLPFANoRecovery;
 306                     }
 307                     break;
 308
 309                 case WX_GL_SAMPLES:
 310                     if ( !wxGLCanvas::IsAGLMultiSampleAvailable() )
 311                     {
 312                         if ( !attribList[arg++] )
 313                             break;
 314
 315                         return false;
 316                     }
 317
 318                     data[p++] = NSOpenGLPFASamples;
 319                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 320                     break;
 321             }
 322         }
 323
 324         data[p] = (NSOpenGLPixelFormatAttribute)nil;
 325
 326         attribs = data;
 327     }
 328
 329     return [[NSOpenGLPixelFormat alloc] initWithAttributes:(NSOpenGLPixelFormatAttribute*) attribs];
 330 #endif
 331     return NULL;
 332 }
 333
 334 bool wxGLContext::SetCurrent(const wxGLCanvas& win) const
 335 {
 336     if ( !m_glContext )
 337         return false;
 338
 339     wxUICustomOpenGLView* v = (wxUICustomOpenGLView*) win.GetPeer()->GetWXWidget();
 340     [v setContext:m_glContext];
 341     return true;
 342 }
 343
 344 #define USE_SEPARATE_VIEW 1
 345
 346 bool wxGLCanvas::Create(wxWindow *parent,
 347                         wxWindowID id,
 348                         const wxPoint& pos,
 349                         const wxSize& size,
 350                         long style,
 351                         const wxString& name,
 352                         const int *attribList,
 353                         const wxPalette& WXUNUSED(palette))
 354 {
 355 /*
 356     m_glFormat = WXGLChoosePixelFormat(attribList);
 357     if ( !m_glFormat )
 358         return false;
 359 */
 360 #if USE_SEPARATE_VIEW
 361     m_macIsUserPane = false ;
 362 #endif
 363
 364     if ( !wxWindow::Create(parent, id, pos, size, style, name) )
 365         return false;
 366
 367 #if USE_SEPARATE_VIEW
 368     CGRect r = wxOSXGetFrameForControl( this, pos , size ) ;
 369     wxUICustomOpenGLView* v = [[wxUICustomOpenGLView alloc] initWithFrame:r];
 370     CAEAGLLayer* eaglLayer = (CAEAGLLayer*) v.layer;
 371     eaglLayer.opaque = YES;
 372     eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
 373             [NSNumber numberWithBool:NO], kEAGLDrawablePropertyRetainedBacking,
 374             kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];
 375
 376     m_peer = new wxWidgetIPhoneImpl( this, v );
 377
 378     MacPostControlCreate(pos, size) ;
 379 #endif
 380     return true;
 381 }
 382
 383 wxGLCanvas::~wxGLCanvas()
 384 {
 385     if ( m_glFormat )
 386         WXGLDestroyPixelFormat(m_glFormat);
 387 }
 388
 389 bool wxGLCanvas::SwapBuffers()
 390 {
 391     WXGLContext context = WXGLGetCurrentContext();
 392     wxCHECK_MSG(context, false, wxT("should have current context"));
 393
 394     wxUICustomOpenGLView* v = (wxUICustomOpenGLView*) m_peer->GetWXWidget();
 395     [v swapBuffers];
 396     return true;
 397 }
 398
 399
 400 #endif // wxUSE_GLCANVAS