+/////////////////////////////////////////////////////////////////////////////
+// Name: glcanvas.cpp
+// Purpose: wxGLCanvas, for using OpenGL/Mesa with wxWindows and GTK
+// Author: Robert Roebling
+// Modified by:
+// Created: 17/08/98
+// RCS-ID: $Id$
+// Copyright: (c) Robert Roebling
+// Licence: wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifdef __GNUG__
+#pragma implementation "glcanvas.h"
+#endif
+
+#include "wx/wxprec.h"
+
+#include "wx/frame.h"
+#include "wx/colour.h"
+#include "glcanvas.h"
+#include <gdk/gdkx.h>
+
+//---------------------------------------------------------------------------
+// wxGLContext
+//---------------------------------------------------------------------------
+
+IMPLEMENT_CLASS(wxGLContext,wxObject)
+
+wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
+{
+ m_window = win;
+ m_widget = win->m_wxwindow;
+
+ int data[] = {GLX_RGBA,GLX_RED_SIZE,1,GLX_GREEN_SIZE,1,
+ GLX_BLUE_SIZE,1,GLX_DOUBLEBUFFER,None};
+
+ Display *display = GDK_WINDOW_XDISPLAY( m_widget->window );
+ XVisualInfo *visual_info = glXChooseVisual( display, DefaultScreen(display), data );
+
+ wxCHECK_RET( visual_info != NULL, "Couldn't choose visual for OpenGl" );
+
+ m_glContext = glXCreateContext( display, visual_info, None, GL_TRUE );
+
+ wxCHECK_RET( m_glContext != NULL, "Couldn't create OpenGl context" );
+
+ glXMakeCurrent( display, GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
+}
+
+wxGLContext::~wxGLContext()
+{
+ if (m_glContext)
+ {
+ Display *display = GDK_WINDOW_XDISPLAY( m_widget->window );
+ glXMakeCurrent( display, GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
+
+ glXDestroyContext( display, m_glContext );
+ }
+}
+
+void wxGLContext::SwapBuffers()
+{
+ if (m_glContext)
+ {
+ Display *display = GDK_WINDOW_XDISPLAY( m_widget->window );
+ glXSwapBuffers( display, GDK_WINDOW_XWINDOW( m_widget->window ) );
+ }
+}
+
+void wxGLContext::SetCurrent()
+{
+ if (m_glContext)
+ {
+ Display *display = GDK_WINDOW_XDISPLAY( m_widget->window );
+ glXMakeCurrent( display, GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
+ }
+}
+
+void wxGLContext::SetColour(const char *colour)
+{
+ float r = 0.0;
+ float g = 0.0;
+ float b = 0.0;
+ wxColour *col = wxTheColourDatabase->FindColour(colour);
+ if (col)
+ {
+ r = (float)(col->Red()/256.0);
+ g = (float)(col->Green()/256.0);
+ b = (float)(col->Blue()/256.0);
+ glColor3f( r, g, b);
+ }
+}
+
+void wxGLContext::SetupPixelFormat()
+{
+}
+
+void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
+{
+}
+
+wxPalette wxGLContext::CreateDefaultPalette()
+{
+ return wxNullPalette;
+}
+
+//---------------------------------------------------------------------------
+// wxGlCanvas
+//---------------------------------------------------------------------------
+
+IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
+
+BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
+ EVT_SIZE(wxGLCanvas::OnSize)
+END_EVENT_TABLE()
+
+wxGLCanvas::wxGLCanvas(wxWindow *parent, wxWindowID id,
+ const wxPoint& pos, const wxSize& size, long style, const wxString& name,
+ int *WXUNUSED(attribList), const wxPalette& palette):
+ wxScrolledWindow(parent, id, pos, size, style, name)
+{
+ m_glContext = new wxGLContext( TRUE, this, palette );
+}
+
+wxGLCanvas::~wxGLCanvas()
+{
+ if (m_glContext) delete m_glContext;
+}
+
+void wxGLCanvas::SwapBuffers()
+{
+ if (m_glContext) m_glContext->SwapBuffers();
+}
+
+void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
+{
+ int width, height;
+ GetClientSize(& width, & height);
+
+ if (m_glContext)
+ {
+ m_glContext->SetCurrent();
+
+ glViewport(0, 0, (GLint)width, (GLint)height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
+ glMatrixMode(GL_MODELVIEW);
+ }
+}
+
+void wxGLCanvas::SetCurrent()
+{
+ if (m_glContext) m_glContext->SetCurrent();
+}
+
+void wxGLCanvas::SetColour( const char *colour )
+{
+ if (m_glContext) m_glContext->SetColour( colour );
+}
+
+