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     CGRect oldRect;
  50     EAGLContext* context;
  51
  52     /* The pixel dimensions of the backbuffer */
  53     GLint backingWidth;
  54     GLint backingHeight;
  55
  56     /* OpenGL names for the renderbuffer and framebuffers used to render to this view */
  57     GLuint viewRenderbuffer, viewFramebuffer;
  58
  59     /* OpenGL name for the depth buffer that is attached to viewFramebuffer, if it exists (0 if it does not exist) */
  60     GLuint depthRenderbuffer;
  61 }
  62
  63 - (BOOL) createFramebuffer;
  64 - (void) destroyFramebuffer;
  65 - (id) initWithFrame:(CGRect) rect;
  66
  67 @end
  68
  69 @implementation wxUICustomOpenGLView
  70
  71 + (Class)layerClass {
  72     return [CAEAGLLayer class];
  73 }
  74
  75 + (void)initialize
  76 {
  77     static BOOL initialized = NO;
  78     if (!initialized)
  79     {
  80         initialized = YES;
  81         wxOSXIPhoneClassAddWXMethods( self );
  82     }
  83 }
  84
  85 - (id) initWithFrame:(CGRect)rect
  86 {
  87     if ( !(self=[super initWithFrame:rect]) )
  88         return nil;
  89
  90     oldRect = rect;
  91     return self;
  92 }
  93
  94 - (BOOL)isOpaque
  95 {
  96     return YES;
  97 }
  98
  99 - (BOOL)createFramebuffer {
 100
 101     glGenFramebuffersOES(1, &viewFramebuffer);
 102     glGenRenderbuffersOES(1, &viewRenderbuffer);
 103     glEnable(GL_CULL_FACE);
 104
 105     glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
 106     glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
 107     [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
 108     glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
 109
 110     glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
 111     glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
 112
 113     if (USE_DEPTH_BUFFER) {
 114         glGenRenderbuffersOES(1, &depthRenderbuffer);
 115         glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
 116         glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, backingWidth, backingHeight);
 117         glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
 118     }
 119
 120     if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
 121         NSLog(@"failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
 122         return NO;
 123     }
 124
 125     return YES;
 126 }
 127
 128
 129 - (void)destroyFramebuffer {
 130
 131     glDeleteFramebuffersOES(1, &viewFramebuffer);
 132     viewFramebuffer = 0;
 133     glDeleteRenderbuffersOES(1, &viewRenderbuffer);
 134     viewRenderbuffer = 0;
 135
 136     if(depthRenderbuffer) {
 137         glDeleteRenderbuffersOES(1, &depthRenderbuffer);
 138         depthRenderbuffer = 0;
 139     }
 140 }
 141
 142 - (void) setContext:(EAGLContext*) ctx {
 143     context = ctx;
 144     [EAGLContext setCurrentContext:ctx];
 145 #if 0
 146     CGRect newRect = [self frame];
 147     if ( /* (CGRectEqualToRect(newRect, oldRect) == NO && ![self isHidden] && newRect.size.width > 0 && newRect.size.height > 0 )
 148         || */ viewFramebuffer == 0 )
 149     {
 150         [self destroyFramebuffer];
 151         [self createFramebuffer];
 152     }
 153 #endif
 154     glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
 155 }
 156
 157 - (void) swapBuffers {
 158     glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
 159     [context presentRenderbuffer:GL_RENDERBUFFER_OES];
 160 }
 161
 162 - (void)layoutSubviews {
 163     [EAGLContext setCurrentContext:context];
 164     [self destroyFramebuffer];
 165     [self createFramebuffer];
 166 }
 167
 168 @end
 169
 170
 171 WXGLContext WXGLCreateContext( WXGLPixelFormat pixelFormat, WXGLContext shareContext )
 172 {
 173     WXGLContext context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
 174
 175     // [[EAGLContext alloc] initWithFormat:pixelFormat shareContext: shareContext];
 176     if ( !context )
 177         wxFAIL_MSG("NSOpenGLContext creation failed");
 178     return context ;
 179 }
 180
 181 void WXGLDestroyContext( WXGLContext context )
 182 {
 183     if ( context )
 184     {
 185         [context release];
 186     }
 187 }
 188
 189 WXGLContext WXGLGetCurrentContext()
 190 {
 191     return [EAGLContext currentContext];
 192 }
 193
 194 bool WXGLSetCurrentContext(WXGLContext context)
 195 {
 196     [EAGLContext setCurrentContext:context];
 197     return true;
 198 }
 199
 200 void WXGLDestroyPixelFormat( WXGLPixelFormat pixelFormat )
 201 {
 202 /*
 203     if ( pixelFormat )
 204     {
 205         [pixelFormat release];
 206     }
 207 */
 208 }
 209
 210
 211 WXGLPixelFormat WXGLChoosePixelFormat(const int *attribList)
 212 {
 213 #if 0
 214     NSOpenGLPixelFormatAttribute data[512];
 215     const NSOpenGLPixelFormatAttribute defaultAttribs[] =
 216     {
 217         NSOpenGLPFADoubleBuffer,
 218         NSOpenGLPFAMinimumPolicy,
 219         NSOpenGLPFAColorSize,(NSOpenGLPixelFormatAttribute)8,
 220         NSOpenGLPFAAlphaSize,(NSOpenGLPixelFormatAttribute)0,
 221         NSOpenGLPFADepthSize,(NSOpenGLPixelFormatAttribute)8,
 222         (NSOpenGLPixelFormatAttribute)nil
 223     };
 224
 225     const NSOpenGLPixelFormatAttribute *attribs;
 226     if ( !attribList )
 227     {
 228         attribs = defaultAttribs;
 229     }
 230     else
 231     {
 232         unsigned p = 0;
 233         data[p++] = NSOpenGLPFAMinimumPolicy; // make _SIZE tags behave more like GLX
 234
 235         for ( unsigned arg = 0; attribList[arg] !=0 && p < WXSIZEOF(data); )
 236         {
 237             switch ( attribList[arg++] )
 238             {
 239                 case WX_GL_RGBA:
 240                     //data[p++] = AGL_RGBA;
 241                     break;
 242
 243                 case WX_GL_BUFFER_SIZE:
 244                     //data[p++] = AGL_BUFFER_SIZE;
 245                     //data[p++] = attribList[arg++];
 246                     break;
 247
 248                 case WX_GL_LEVEL:
 249                     //data[p++]=AGL_LEVEL;
 250                     //data[p++]=attribList[arg++];
 251                     break;
 252
 253                 case WX_GL_DOUBLEBUFFER:
 254                     data[p++] = NSOpenGLPFADoubleBuffer;
 255                     break;
 256
 257                 case WX_GL_STEREO:
 258                     data[p++] = NSOpenGLPFAStereo;
 259                     break;
 260
 261                 case WX_GL_AUX_BUFFERS:
 262                     data[p++] = NSOpenGLPFAAuxBuffers;
 263                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 264                     break;
 265
 266                 case WX_GL_MIN_RED:
 267                     data[p++] = NSOpenGLPFAColorSize;
 268                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 269                     break;
 270
 271                 case WX_GL_MIN_GREEN:
 272                     //data[p++] = AGL_GREEN_SIZE;
 273                     //data[p++] = attribList[arg++];
 274                     break;
 275
 276                 case WX_GL_MIN_BLUE:
 277                     //data[p++] = AGL_BLUE_SIZE;
 278                     //data[p++] = attribList[arg++];
 279                     break;
 280
 281                 case WX_GL_MIN_ALPHA:
 282                     data[p++] = NSOpenGLPFAAlphaSize;
 283                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 284                     break;
 285
 286                 case WX_GL_DEPTH_SIZE:
 287                     data[p++] = NSOpenGLPFADepthSize;
 288                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 289                     break;
 290
 291                 case WX_GL_STENCIL_SIZE:
 292                     data[p++] = NSOpenGLPFAStencilSize;
 293                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 294                     break;
 295
 296                 case WX_GL_MIN_ACCUM_RED:
 297                     data[p++] = NSOpenGLPFAAccumSize;
 298                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 299                     break;
 300
 301                 case WX_GL_MIN_ACCUM_GREEN:
 302                     //data[p++] = AGL_ACCUM_GREEN_SIZE;
 303                     //data[p++] = attribList[arg++];
 304                     break;
 305
 306                 case WX_GL_MIN_ACCUM_BLUE:
 307                     //data[p++] = AGL_ACCUM_BLUE_SIZE;
 308                     //data[p++] = attribList[arg++];
 309                     break;
 310
 311                 case WX_GL_MIN_ACCUM_ALPHA:
 312                     //data[p++] = AGL_ACCUM_ALPHA_SIZE;
 313                     //data[p++] = attribList[arg++];
 314                     break;
 315
 316                 case WX_GL_SAMPLE_BUFFERS:
 317                     if ( !wxGLCanvas::IsAGLMultiSampleAvailable() )
 318                     {
 319                         if ( !attribList[arg++] )
 320                             break;
 321
 322                         return false;
 323                     }
 324
 325                     data[p++] = NSOpenGLPFASampleBuffers;
 326                     if ( (data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++]) == true )
 327                     {
 328                         // don't use software fallback
 329                         data[p++] = NSOpenGLPFANoRecovery;
 330                     }
 331                     break;
 332
 333                 case WX_GL_SAMPLES:
 334                     if ( !wxGLCanvas::IsAGLMultiSampleAvailable() )
 335                     {
 336                         if ( !attribList[arg++] )
 337                             break;
 338
 339                         return false;
 340                     }
 341
 342                     data[p++] = NSOpenGLPFASamples;
 343                     data[p++] = (NSOpenGLPixelFormatAttribute) attribList[arg++];
 344                     break;
 345             }
 346         }
 347
 348         data[p] = (NSOpenGLPixelFormatAttribute)nil;
 349
 350         attribs = data;
 351     }
 352
 353     return [[NSOpenGLPixelFormat alloc] initWithAttributes:(NSOpenGLPixelFormatAttribute*) attribs];
 354 #endif
 355     return NULL;
 356 }
 357
 358 bool wxGLContext::SetCurrent(const wxGLCanvas& win) const
 359 {
 360     if ( !m_glContext )
 361         return false;
 362
 363     wxUICustomOpenGLView* v = (wxUICustomOpenGLView*) win.GetPeer()->GetWXWidget();
 364     [v setContext:m_glContext];
 365     return true;
 366 }
 367
 368 #define USE_SEPARATE_VIEW 1
 369
 370 bool wxGLCanvas::Create(wxWindow *parent,
 371                         wxWindowID id,
 372                         const wxPoint& pos,
 373                         const wxSize& size,
 374                         long style,
 375                         const wxString& name,
 376                         const int *attribList,
 377                         const wxPalette& WXUNUSED(palette))
 378 {
 379 /*
 380     m_glFormat = WXGLChoosePixelFormat(attribList);
 381     if ( !m_glFormat )
 382         return false;
 383 */
 384 #if USE_SEPARATE_VIEW
 385     m_macIsUserPane = false ;
 386 #endif
 387
 388     if ( !wxWindow::Create(parent, id, pos, size, style, name) )
 389         return false;
 390
 391 #if USE_SEPARATE_VIEW
 392     CGRect r = wxOSXGetFrameForControl( this, pos , size ) ;
 393     wxUICustomOpenGLView* v = [[wxUICustomOpenGLView alloc] initWithFrame:r];
 394     CAEAGLLayer* eaglLayer = (CAEAGLLayer*) v.layer;
 395     eaglLayer.opaque = YES;
 396     eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
 397             [NSNumber numberWithBool:NO], kEAGLDrawablePropertyRetainedBacking,
 398             kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];
 399
 400     m_peer = new wxWidgetIPhoneImpl( this, v );
 401
 402     MacPostControlCreate(pos, size) ;
 403 #endif
 404     return true;
 405 }
 406
 407 wxGLCanvas::~wxGLCanvas()
 408 {
 409     if ( m_glFormat )
 410         WXGLDestroyPixelFormat(m_glFormat);
 411 }
 412
 413 bool wxGLCanvas::SwapBuffers()
 414 {
 415     WXGLContext context = WXGLGetCurrentContext();
 416     wxCHECK_MSG(context, false, wxT("should have current context"));
 417
 418     wxUICustomOpenGLView* v = (wxUICustomOpenGLView*) m_peer->GetWXWidget();
 419     [v swapBuffers];
 420     return true;
 421 }
 422
 423
 424 #endif // wxUSE_GLCANVAS