Big wxGL classes refactoring/cleanup:

1. Provide the same API, especially, but not limited to, wxGLCanvas and
   wxCLContext ctors (which were completely different in all ports)
2. Extracted common parts into wxGLCanvas/ContextBase classes
3. Deprecate the old API using implicitly created wxGLContext


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45388 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/glcmn.cpp

@@ -0,0 +1,108 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        src/common/glcmn.cpp
+// Purpose:     wxGLCanvasBase implementation
+// Author:      Vadim Zeitlin
+// Created:     2007-04-09
+// RCS-ID:      $Id$
+// Copyright:   (c) 2007 Vadim Zeitlin <vadim@wxwindows.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// for compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#if wxUSE_GLCANVAS
+
+#ifndef WX_PRECOMP
+    #include "wx/log.h"
+#endif // WX_PRECOMP
+
+#include "wx/glcanvas.h"
+
+// DLL options compatibility check:
+#include "wx/build.h"
+WX_CHECK_BUILD_OPTIONS("wxGL")
+
+IMPLEMENT_CLASS(wxGLApp, wxApp)
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+void wxGLCanvasBase::SetCurrent(const wxGLContext& context) const
+{
+    // although on MSW it works even if the window is still hidden, it doesn't
+    // work in other ports (notably X11-based ones) and documentation mentions
+    // that SetCurrent() can only be called for a shown window, so check for it
+    wxASSERT_MSG( IsShownOnScreen(), _T("can't make hidden GL canvas current") );
+
+    context.SetCurrent(*wx_static_cast(const wxGLCanvas *, this));
+}
+
+bool wxGLCanvasBase::SetColour(const wxChar *colour)
+{
+    wxColour col = wxTheColourDatabase->Find(colour);
+    if ( !col.Ok() )
+        return false;
+
+    GLboolean isRGBA;
+    glGetBooleanv(GL_RGBA_MODE, &isRGBA);
+    if ( isRGBA )
+    {
+        glColor3f(col.Red() / 256., col.Green() / 256., col.Blue() / 256.);
+    }
+    else // indexed colour
+    {
+        GLint pix = GetColourIndex(col);
+        if ( pix == -1 )
+        {
+            wxLogError(_("Failed to allocate colour for OpenGL"));
+            return false;
+        }
+
+        glIndexi(pix);
+    }
+
+    return true;
+}
+
+wxGLCanvasBase::~wxGLCanvasBase()
+{
+#if WXWIN_COMPATIBILITY_2_8
+    delete m_glContext;
+#endif // WXWIN_COMPATIBILITY_2_8
+}
+
+#if WXWIN_COMPATIBILITY_2_8
+
+wxGLContext *wxGLCanvasBase::GetContext() const
+{
+    return m_glContext;
+}
+
+void wxGLCanvasBase::SetCurrent()
+{
+    if ( m_glContext )
+        SetCurrent(*m_glContext);
+}
+
+void wxGLCanvasBase::OnSize(wxSizeEvent& WXUNUSED(event))
+{
+}
+
+#endif // WXWIN_COMPATIBILITY_2_8
+
+#endif // wxUSE_GLCANVAS
+