src/mac/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL with wxWindows under Macintosh
   4 // Author:      AUTHOR
   5 // Modified by:
   6 // Created:     ??/??/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) AUTHOR
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "glcanvas.h"
  14 #endif
  15
  16 #include "wx/wxprec.h"
  17
  18 #if defined(__BORLANDC__)
  19 #pragma hdrstop
  20 #endif
  21
  22 #include "wx/setup.h"
  23
  24 #if wxUSE_GLCANVAS
  25
  26 #ifndef WX_PRECOMP
  27 #include "wx/frame.h"
  28 #endif
  29
  30 #include "wx/settings.h"
  31 #include "wx/log.h"
  32
  33 #include "wx/glcanvas.h"
  34 #include "wx/mac/uma.h"
  35
  36 /*
  37  * GLContext implementation
  38  */
  39
  40 wxGLContext::wxGLContext(
  41                AGLPixelFormat fmt, wxGLCanvas *win,
  42                const wxPalette& palette,
  43                const wxGLContext *other        /* for sharing display lists */
  44 )
  45 {
  46     m_window = win;
  47
  48     m_drawable = (AGLDrawable) UMAGetWindowPort(win->GetMacRootWindow());
  49
  50     m_glContext = aglCreateContext(fmt, other ? other->m_glContext : NULL);
  51     wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGl context") );
  52
  53         GLboolean b;
  54     b = aglSetDrawable(m_glContext, m_drawable);
  55     wxCHECK_RET( b, wxT("Couldn't bind OpenGl context") );
  56         aglEnable(m_glContext , AGL_BUFFER_RECT ) ;
  57     b = aglSetCurrentContext(m_glContext);
  58     wxCHECK_RET( b, wxT("Couldn't activate OpenGl context") );
  59 }
  60
  61 wxGLContext::~wxGLContext()
  62 {
  63   if (m_glContext)
  64   {
  65     aglSetCurrentContext(NULL);
  66         aglDestroyContext(m_glContext);
  67   }
  68 }
  69
  70 void wxGLContext::SwapBuffers()
  71 {
  72   if (m_glContext)
  73   {
  74     aglSwapBuffers(m_glContext);
  75   }
  76 }
  77
  78 void wxGLContext::SetCurrent()
  79 {
  80   if (m_glContext)
  81   {
  82     aglSetCurrentContext(m_glContext);
  83   }
  84 }
  85
  86 void wxGLContext::Update()
  87 {
  88   if (m_glContext)
  89   {
  90     aglUpdateContext(m_glContext);
  91   }
  92 }
  93
  94 void wxGLContext::SetColour(const char *colour)
  95 {
  96   float r = 0.0;
  97   float g = 0.0;
  98   float b = 0.0;
  99   wxColour *col = wxTheColourDatabase->FindColour(colour);
 100   if (col)
 101   {
 102     r = (float)(col->Red()/256.0);
 103     g = (float)(col->Green()/256.0);
 104     b = (float)(col->Blue()/256.0);
 105     glColor3f( r, g, b);
 106   }
 107 }
 108
 109
 110 /*
 111  * wxGLCanvas implementation
 112  */
 113
 114 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 115
 116 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 117     EVT_SIZE(wxGLCanvas::OnSize)
 118 END_EVENT_TABLE()
 119
 120 wxGLCanvas::wxGLCanvas(wxWindow *parent, wxWindowID id,
 121     const wxPoint& pos, const wxSize& size, long style, const wxString& name,
 122     int *attribList, const wxPalette& palette)
 123 {
 124     Create(parent, NULL, id, pos, size, style, name, attribList, palette);
 125 }
 126
 127 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 128               const wxGLContext *shared, wxWindowID id,
 129               const wxPoint& pos, const wxSize& size, long style, const wxString& name,
 130               int *attribList, const wxPalette& palette )
 131 {
 132     Create(parent, shared, id, pos, size, style, name, attribList, palette);
 133 }
 134
 135 wxGLCanvas::wxGLCanvas( wxWindow *parent, const wxGLCanvas *shared, wxWindowID id,
 136                         const wxPoint& pos, const wxSize& size, long style, const wxString& name,
 137                         int *attribList, const wxPalette& palette )
 138 {
 139     Create(parent, shared ? shared->GetContext() : NULL, id, pos, size, style, name, attribList, palette);
 140 }
 141
 142 wxGLCanvas::~wxGLCanvas()
 143 {
 144   if (m_glContext)
 145     delete m_glContext;
 146 }
 147
 148 static AGLPixelFormat ChoosePixelFormat(const int *attribList)
 149 {
 150     GLint data[512];
 151     GLint defaultAttribs[] = { AGL_RGBA,
 152                      AGL_DOUBLEBUFFER,
 153                      AGL_MINIMUM_POLICY,
 154                      AGL_DEPTH_SIZE, 1,  // use largest available depth buffer
 155                      AGL_RED_SIZE, 1,
 156                      AGL_GREEN_SIZE, 1,
 157                      AGL_BLUE_SIZE, 1,
 158                      AGL_ALPHA_SIZE, 0,
 159                      AGL_NONE };
 160     GLint *attribs;
 161     if (!attribList)
 162     {
 163           attribs = defaultAttribs;
 164     }
 165     else
 166     {
 167       int arg=0, p=0;
 168
 169       data[p++] = AGL_MINIMUM_POLICY; // make _SIZE tags behave more like GLX
 170       while( (attribList[arg]!=0) && (p<512) )
 171       {
 172         switch( attribList[arg++] )
 173         {
 174           case WX_GL_RGBA: data[p++] = AGL_RGBA; break;
 175           case WX_GL_BUFFER_SIZE:
 176             data[p++]=AGL_BUFFER_SIZE; data[p++]=attribList[arg++]; break;
 177           case WX_GL_LEVEL:
 178             data[p++]=AGL_LEVEL; data[p++]=attribList[arg++]; break;
 179           case WX_GL_DOUBLEBUFFER: data[p++] = AGL_DOUBLEBUFFER; break;
 180           case WX_GL_STEREO: data[p++] = AGL_STEREO; break;
 181           case WX_GL_AUX_BUFFERS:
 182             data[p++]=AGL_AUX_BUFFERS; data[p++]=attribList[arg++]; break;
 183           case WX_GL_MIN_RED:
 184             data[p++]=AGL_RED_SIZE; data[p++]=attribList[arg++]; break;
 185           case WX_GL_MIN_GREEN:
 186             data[p++]=AGL_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 187           case WX_GL_MIN_BLUE:
 188             data[p++]=AGL_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 189           case WX_GL_MIN_ALPHA:
 190             data[p++]=AGL_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 191           case WX_GL_DEPTH_SIZE:
 192             data[p++]=AGL_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 193           case WX_GL_STENCIL_SIZE:
 194             data[p++]=AGL_STENCIL_SIZE; data[p++]=attribList[arg++]; break;
 195           case WX_GL_MIN_ACCUM_RED:
 196             data[p++]=AGL_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break;
 197           case WX_GL_MIN_ACCUM_GREEN:
 198             data[p++]=AGL_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 199           case WX_GL_MIN_ACCUM_BLUE:
 200             data[p++]=AGL_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 201           case WX_GL_MIN_ACCUM_ALPHA:
 202             data[p++]=AGL_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 203           default:
 204             break;
 205         }
 206       }
 207       data[p] = 0;
 208
 209       attribs = data;
 210     }
 211
 212     return aglChoosePixelFormat(NULL, 0, attribs);
 213 }
 214
 215 bool wxGLCanvas::Create(wxWindow *parent, const wxGLContext *shared, wxWindowID id,
 216                         const wxPoint& pos, const wxSize& size, long style, const wxString& name,
 217                         int *attribList, const wxPalette& palette)
 218 {
 219         m_macEraseOnRedraw = false ;
 220     wxWindow::Create( parent, id, pos, size, style, name );
 221
 222     AGLPixelFormat fmt = ChoosePixelFormat(attribList);
 223     wxCHECK_MSG( fmt, false, wxT("Couldn't create OpenGl pixel format") );
 224
 225     m_glContext = new wxGLContext(fmt, this, palette, shared);
 226
 227     aglDestroyPixelFormat(fmt);
 228
 229     return true;
 230 }
 231
 232 void wxGLCanvas::SwapBuffers()
 233 {
 234   if (m_glContext)
 235     m_glContext->SwapBuffers();
 236 }
 237
 238 void wxGLCanvas::UpdateContext()
 239 {
 240   if (m_glContext)
 241     m_glContext->Update();
 242 }
 243
 244 void wxGLCanvas::SetViewport()
 245 {
 246   // viewport is initially set to entire port
 247   // adjust glViewport to just this window
 248     int x = 0 ;
 249     int y = 0 ;
 250
 251     MacClientToRootWindow( &x , &y ) ;
 252     int width, height;
 253     GetClientSize(& width, & height);
 254     Rect bounds ;
 255     GetWindowPortBounds( GetMacRootWindow() , &bounds ) ;
 256     GLint parms[4] ;
 257     parms[0] = x ;
 258     parms[1] = bounds.bottom - bounds.top - ( y + height ) ;
 259     parms[2] = width ;
 260     parms[3] = height ;
 261
 262         aglSetInteger( m_glContext->m_glContext , AGL_BUFFER_RECT , parms ) ;
 263 }
 264
 265 void wxGLCanvas::OnSize(wxSizeEvent& event)
 266 {
 267   if (m_glContext)
 268   {
 269     UpdateContext();
 270     m_glContext->SetCurrent();
 271
 272     SetViewport();
 273     glMatrixMode(GL_PROJECTION);
 274     glLoadIdentity();
 275     glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 276     glMatrixMode(GL_MODELVIEW);
 277   }
 278 }
 279
 280 void wxGLCanvas::SetCurrent()
 281 {
 282   if (m_glContext)
 283   {
 284     m_glContext->SetCurrent();
 285   }
 286 }
 287
 288 void wxGLCanvas::SetColour(const char *colour)
 289 {
 290   if (m_glContext)
 291     m_glContext->SetColour(colour);
 292 }
 293
 294
 295 //---------------------------------------------------------------------------
 296 // wxGLApp
 297 //---------------------------------------------------------------------------
 298
 299 IMPLEMENT_CLASS(wxGLApp, wxApp)
 300
 301 bool wxGLApp::InitGLVisual(int *attribList)
 302 {
 303     AGLPixelFormat fmt = ChoosePixelFormat(attribList);
 304     if (fmt != NULL) {
 305         aglDestroyPixelFormat(fmt);
 306         return true;
 307     } else
 308         return false;
 309 }
 310
 311 wxGLApp::~wxGLApp(void)
 312 {
 313 }
 314
 315 #endif // wxUSE_GLCANVAS