Frame rate limiter for Windows, Untested OSX / Linux

src/visual/MeterCanvas.cpp

@@ -63,6 +63,8 @@ void MeterCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     const wxSize ClientSize = GetClientSize();
 
     glContext->SetCurrent(*this);
+    initGLExtensions();
+
     glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     glContext->DrawBegin();

src/visual/ModeSelectorCanvas.cpp

@@ -50,6 +50,8 @@ void ModeSelectorCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     const wxSize ClientSize = GetClientSize();
 
     glContext->SetCurrent(*this);
+    initGLExtensions();
+
     glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     glContext->DrawBegin();

src/visual/ScopeCanvas.cpp

@@ -67,6 +67,8 @@ void ScopeCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     }
 
     glContext->SetCurrent(*this);
+    initGLExtensions();
+
     glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     glContext->DrawBegin();

src/visual/SpectrumCanvas.cpp

@@ -70,6 +70,8 @@ void SpectrumCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     const wxSize ClientSize = GetClientSize();
 
     glContext->SetCurrent(*this);
+    initGLExtensions();
+
     glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     glContext->BeginDraw(ThemeMgr::mgr.currentTheme->fftBackground.r, ThemeMgr::mgr.currentTheme->fftBackground.g, ThemeMgr::mgr.currentTheme->fftBackground.b);

src/visual/TuningCanvas.cpp

@@ -39,6 +39,7 @@ void TuningCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     const wxSize ClientSize = GetClientSize();
 
     glContext->SetCurrent(*this);
+    initGLExtensions();
     glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     glContext->DrawBegin();

src/visual/WaterfallCanvas.cpp

@@ -116,7 +116,8 @@ void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     }
 
     glContext->SetCurrent(*this);
-    glViewport(0, 0, ClientSize.x, ClientSize.y);
+    initGLExtensions();
+   glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     glContext->BeginDraw(0,0,0);
     glContext->Draw(spectrum_points);