src/common/glcmn.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/glcmn.cpp
   3 // Purpose:     wxGLCanvasBase implementation
   4 // Author:      Vadim Zeitlin
   5 // Created:     2007-04-09
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2007 Vadim Zeitlin <vadim@wxwindows.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #if wxUSE_GLCANVAS
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/log.h"
  30 #endif // WX_PRECOMP
  31
  32 #include "wx/glcanvas.h"
  33
  34 // DLL options compatibility check:
  35 #include "wx/build.h"
  36 WX_CHECK_BUILD_OPTIONS("wxGL")
  37
  38 IMPLEMENT_CLASS(wxGLApp, wxApp)
  39
  40 // ============================================================================
  41 // implementation
  42 // ============================================================================
  43
  44 wxGLCanvasBase::wxGLCanvasBase()
  45 {
  46 #if WXWIN_COMPATIBILITY_2_8
  47     m_glContext = NULL;
  48 #endif
  49
  50     // we always paint background entirely ourselves so prevent wx from erasing
  51     // it to avoid flicker
  52     SetBackgroundStyle(wxBG_STYLE_CUSTOM);
  53 }
  54
  55 bool wxGLCanvasBase::SetCurrent(const wxGLContext& context) const
  56 {
  57     // although on MSW it works even if the window is still hidden, it doesn't
  58     // work in other ports (notably X11-based ones) and documentation mentions
  59     // that SetCurrent() can only be called for a shown window, so check for it
  60     wxASSERT_MSG( IsShownOnScreen(), wxT("can't make hidden GL canvas current") );
  61
  62     return context.SetCurrent(*static_cast<const wxGLCanvas *>(this));
  63 }
  64
  65 #ifndef wxHAS_OPENGL_ES
  66 bool wxGLCanvasBase::SetColour(const wxString& colour)
  67 {
  68     wxColour col = wxTheColourDatabase->Find(colour);
  69     if ( !col.Ok() )
  70         return false;
  71
  72     GLboolean isRGBA;
  73     glGetBooleanv(GL_RGBA_MODE, &isRGBA);
  74     if ( isRGBA )
  75     {
  76         glColor3f(col.Red() / 256., col.Green() / 256., col.Blue() / 256.);
  77     }
  78     else // indexed colour
  79     {
  80         GLint pix = GetColourIndex(col);
  81         if ( pix == -1 )
  82         {
  83             wxLogError(_("Failed to allocate colour for OpenGL"));
  84             return false;
  85         }
  86
  87         glIndexi(pix);
  88     }
  89
  90     return true;
  91 }
  92 #endif
  93
  94 wxGLCanvasBase::~wxGLCanvasBase()
  95 {
  96 #if WXWIN_COMPATIBILITY_2_8
  97     delete m_glContext;
  98 #endif // WXWIN_COMPATIBILITY_2_8
  99 }
 100
 101 #if WXWIN_COMPATIBILITY_2_8
 102
 103 wxGLContext *wxGLCanvasBase::GetContext() const
 104 {
 105     return m_glContext;
 106 }
 107
 108 void wxGLCanvasBase::SetCurrent()
 109 {
 110     if ( m_glContext )
 111         SetCurrent(*m_glContext);
 112 }
 113
 114 void wxGLCanvasBase::OnSize(wxSizeEvent& WXUNUSED(event))
 115 {
 116 }
 117
 118 #endif // WXWIN_COMPATIBILITY_2_8
 119
 120 /* static */
 121 bool wxGLCanvasBase::IsExtensionInList(const char *list, const char *extension)
 122 {
 123     if ( !list )
 124         return false;
 125
 126     for ( const char *p = list; *p; p++ )
 127     {
 128         // advance up to the next possible match
 129         p = wxStrstr(p, extension);
 130         if ( !p )
 131             break;
 132
 133         // check that the extension appears at the beginning/ending of the list
 134         // or is preceded/followed by a space to avoid mistakenly finding
 135         // "glExtension" in a list containing some "glFunkyglExtension"
 136         if ( (p == list || p[-1] == ' ') )
 137         {
 138             char c = p[strlen(extension)];
 139             if ( c == '\0' || c == ' ' )
 140                 return true;
 141         }
 142     }
 143
 144     return false;
 145 }
 146
 147 #endif // wxUSE_GLCANVAS
 148