Extensive documentation typo patch (closes #13063).

[wxWidgets.git] / samples / opengl / isosurf / isosurf.cpp

diff --git a/samples/opengl/isosurf/isosurf.cpp b/samples/opengl/isosurf/isosurf.cpp
index 895c3d44e3ad623a29f98c334f73860bddde2343..a2ea654f916d98f1d7f5fcec5c4d304480a224d1 100644 (file)
--- a/samples/opengl/isosurf/isosurf.cpp
+++ b/samples/opengl/isosurf/isosurf.cpp
@@ -2,18 +2,13 @@
 // Name:        isosurf.cpp
 // Purpose:     wxGLCanvas demo program
 // Author:      Brian Paul (original gltk version), Wolfram Gloger
 // Name:        isosurf.cpp
 // Purpose:     wxGLCanvas demo program
 // Author:      Brian Paul (original gltk version), Wolfram Gloger

-// Modified by: Julian Smart
+// Modified by: Julian Smart, Francesco Montorsi

 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-#ifdef __GNUG__
-#pragma implementation
-#pragma interface
-#endif
-

 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 


@@ -26,398 +21,321 @@
 #endif
 
 #if !wxUSE_GLCANVAS
 #endif
 
 #if !wxUSE_GLCANVAS

-#error Please set wxUSE_GLCANVAS to 1 in setup.h.
+    #error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"

 #endif
 
 #include "wx/timer.h"
 #include "wx/glcanvas.h"
 #endif
 
 #include "wx/timer.h"
 #include "wx/glcanvas.h"

-
-#ifdef __WXMAC__
-#  ifdef __DARWIN__
-#    include <OpenGL/gl.h>
-#    include <OpenGL/glu.h>
-#  else
-#    include <gl.h>
-#    include <glu.h>
-#  endif
-#else
-#  include <GL/gl.h>
-#  include <GL/glu.h>
-#endif
-
-// disabled because this has apparently changed in OpenGL 1.2, so doesn't link
-// correctly if this is on...
-#ifdef GL_EXT_vertex_array
-#undef GL_EXT_vertex_array
-#endif
+#include "wx/math.h"
+#include "wx/log.h"
+#include "wx/cmdline.h"
+#include "wx/wfstream.h"
+#include "wx/zstream.h"
+#include "wx/txtstrm.h"

 
 #include "isosurf.h"
 
 #include "isosurf.h"

+#include "../../sample.xpm"

 
 

-// The following part is taken largely unchanged from the original C Version
-
-#include <math.h>

 
 

-GLboolean speed_test = GL_FALSE;
-GLboolean use_vertex_arrays = GL_FALSE;
+// global options which can be set through command-line options
+GLboolean g_use_vertex_arrays = GL_FALSE;
+GLboolean g_doubleBuffer = GL_TRUE;
+GLboolean g_smooth = GL_TRUE;
+GLboolean g_lighting = GL_TRUE;

 
 

-GLboolean doubleBuffer = GL_TRUE;

 
 

-GLboolean smooth = GL_TRUE;
-GLboolean lighting = GL_TRUE;

 
 

+//---------------------------------------------------------------------------
+// MyApp
+//---------------------------------------------------------------------------

 
 

-#define MAXVERTS 10000
-
-static GLfloat verts[MAXVERTS][3];
-static GLfloat norms[MAXVERTS][3];
-static GLint numverts;
-
-static GLfloat xrot;
-static GLfloat yrot;
-
+IMPLEMENT_APP(MyApp)

 
 

-static void read_surface( char *filename )
+bool MyApp::OnInit()

 {
 {

-   FILE *f;
-
-   f = fopen(filename,"r");
-   if (!f) {
-      wxString msg("Couldn't read ");
-      msg += filename;
-      wxMessageBox(msg);
-      return;
-   }
-
-   numverts = 0;
-   while (!feof(f) && numverts<MAXVERTS) {
-      fscanf( f, "%f %f %f  %f %f %f",
-          &verts[numverts][0], &verts[numverts][1], &verts[numverts][2],
-          &norms[numverts][0], &norms[numverts][1], &norms[numverts][2] );
-      numverts++;
-   }
-   numverts--;
-
-   printf("%d vertices, %d triangles\n", numverts, numverts-2);
-   fclose(f);
-}
+    if ( !wxApp::OnInit() )
+        return false;

 
 

+    // Create the main frame window
+    MyFrame *frame = new MyFrame(NULL, wxT("wxWidgets OpenGL Isosurf Sample"));

 
 

-static void draw_surface( void )
-{
-   GLint i;
-
-#ifdef GL_EXT_vertex_array
-   if (use_vertex_arrays) {
-      glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
-   }
-   else {
-#endif
-      glBegin( GL_TRIANGLE_STRIP );
-      for (i=0;i<numverts;i++) {
-         glNormal3fv( norms[i] );
-         glVertex3fv( verts[i] );
-      }
-      glEnd();
-#ifdef GL_EXT_vertex_array
-   }
-#endif
+    return true;

 }
 
 }
 

-
-static void draw1(void)
+void MyApp::OnInitCmdLine(wxCmdLineParser& parser)

 {
 {

-    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-    glPushMatrix();
-    glRotatef( yrot, 0.0, 1.0, 0.0 );
-    glRotatef( xrot, 1.0, 0.0, 0.0 );
+    parser.AddSwitch("", "sb", "Do not use double buffering");
+    parser.AddSwitch("", "db", "Use double buffering");
+    parser.AddSwitch("", "va", "Use vertex arrays");

 
 

-    draw_surface();
-
-    glPopMatrix();
-
-    glFlush();
+    wxApp::OnInitCmdLine(parser);

 }
 
 }
 

-
-static void InitMaterials(void)
+bool MyApp::OnCmdLineParsed(wxCmdLineParser& parser)

 {
 {

-    static float ambient[] = {0.1, 0.1, 0.1, 1.0};
-    static float diffuse[] = {0.5, 1.0, 1.0, 1.0};
-    static float position0[] = {0.0, 0.0, 20.0, 0.0};
-    static float position1[] = {0.0, 0.0, -20.0, 0.0};
-    static float front_mat_shininess[] = {60.0};
-    static float front_mat_specular[] = {0.2, 0.2, 0.2, 1.0};
-    static float front_mat_diffuse[] = {0.5, 0.28, 0.38, 1.0};
-    /*
-    static float back_mat_shininess[] = {60.0};
-    static float back_mat_specular[] = {0.5, 0.5, 0.2, 1.0};
-    static float back_mat_diffuse[] = {1.0, 1.0, 0.2, 1.0};
-    */
-    static float lmodel_ambient[] = {1.0, 1.0, 1.0, 1.0};
-    static float lmodel_twoside[] = {GL_FALSE};
+    if (parser.Found("sb"))
+        g_doubleBuffer = GL_FALSE;
+    else if (parser.Found("db"))
+        g_doubleBuffer = GL_TRUE;

 
 

-    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
-    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
-    glLightfv(GL_LIGHT0, GL_POSITION, position0);
-    glEnable(GL_LIGHT0);
-    
-    glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
-    glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
-    glLightfv(GL_LIGHT1, GL_POSITION, position1);
-    glEnable(GL_LIGHT1);
-    
-    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
-    glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
-    glEnable(GL_LIGHTING);
-
-    glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
-    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
-    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);
-}
-
-
-static void Init(void)
-{
-   glClearColor(0.0, 0.0, 0.0, 0.0);
-
-   glShadeModel(GL_SMOOTH);
-   glEnable(GL_DEPTH_TEST);
-
-   InitMaterials();
-
-   glMatrixMode(GL_PROJECTION);
-   glLoadIdentity();
-   glFrustum( -1.0, 1.0, -1.0, 1.0, 5, 25 );
-
-   glMatrixMode(GL_MODELVIEW);
-   glLoadIdentity();
-   glTranslatef( 0.0, 0.0, -6.0 );
+    if (parser.Found("va"))
+        g_use_vertex_arrays = GL_TRUE;

 
 

-#ifdef GL_EXT_vertex_array
-   if (use_vertex_arrays) {
-      glVertexPointerEXT( 3, GL_FLOAT, 0, numverts, verts );
-      glNormalPointerEXT( GL_FLOAT, 0, numverts, norms );
-      glEnable( GL_VERTEX_ARRAY_EXT );
-      glEnable( GL_NORMAL_ARRAY_EXT );
-   }
-#endif
-}
-
-static GLenum Args(int argc, char **argv)
-{
-   GLint i;
-
-   for (i = 1; i < argc; i++) {
-      if (strcmp(argv[i], "-sb") == 0) {
-         doubleBuffer = GL_FALSE;
-      }
-      else if (strcmp(argv[i], "-db") == 0) {
-         doubleBuffer = GL_TRUE;
-      }
-      else if (strcmp(argv[i], "-speed") == 0) {
-         speed_test = GL_TRUE;
-         doubleBuffer = GL_TRUE;
-      }
-      else if (strcmp(argv[i], "-va") == 0) {
-         use_vertex_arrays = GL_TRUE;
-      }
-      else {
-         wxString msg("Bad option: ");
-         msg += argv[i];
-         wxMessageBox(msg);
-         return GL_FALSE;
-      }
-   }
-
-   return GL_TRUE;
+    return wxApp::OnCmdLineParsed(parser);

 }
 
 }
 

-// The following part was written for wxWindows 1.66
-MyFrame *frame = NULL;
+//---------------------------------------------------------------------------
+// MyFrame
+//---------------------------------------------------------------------------

 
 

-IMPLEMENT_APP(MyApp)
+BEGIN_EVENT_TABLE(MyFrame, wxFrame)
+    EVT_MENU(wxID_EXIT, MyFrame::OnExit)
+END_EVENT_TABLE()

 
 

-// `Main program' equivalent, creating windows and returning main app frame
-bool MyApp::OnInit(void)
+MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
+                 const wxSize& size, long style)
+    : wxFrame(frame, wxID_ANY, title, pos, size, style),
+      m_canvas(NULL)

 {
 {

-  Args(argc, argv);
+    SetIcon(wxICON(sample));

 
 

-  // Create the main frame window
-  frame = new MyFrame(NULL, "Isosurf GL Sample", wxPoint(50, 50), wxSize(200, 200));

 
 

-  // Give it an icon
-  frame->SetIcon(wxIcon("mondrian"));
+    // Make a menubar
+    wxMenu *fileMenu = new wxMenu;

 
 

-  // Make a menubar
-  wxMenu *fileMenu = new wxMenu;
+    fileMenu->Append(wxID_EXIT, wxT("E&xit"));
+    wxMenuBar *menuBar = new wxMenuBar;
+    menuBar->Append(fileMenu, wxT("&File"));
+    SetMenuBar(menuBar);

 
 

-  fileMenu->Append(wxID_EXIT, "E&xit");
-  wxMenuBar *menuBar = new wxMenuBar;
-  menuBar->Append(fileMenu, "&File");
-  frame->SetMenuBar(menuBar);

 
   // Make a TestGLCanvas
 
   // JACS
 #ifdef __WXMSW__
 
   // Make a TestGLCanvas
 
   // JACS
 #ifdef __WXMSW__

-  int *gl_attrib = NULL;
+    int *gl_attrib = NULL;

 #else
 #else

-  int gl_attrib[20] = { WX_GL_RGBA, WX_GL_MIN_RED, 1, WX_GL_MIN_GREEN, 1,
-            WX_GL_MIN_BLUE, 1, WX_GL_DEPTH_SIZE, 1,
-            WX_GL_DOUBLEBUFFER,
-#  ifdef __WXMAC__
-            GL_NONE };
+    int gl_attrib[20] =
+        { WX_GL_RGBA, WX_GL_MIN_RED, 1, WX_GL_MIN_GREEN, 1,
+        WX_GL_MIN_BLUE, 1, WX_GL_DEPTH_SIZE, 1,
+        WX_GL_DOUBLEBUFFER,
+#  if defined(__WXMAC__) || defined(__WXCOCOA__)
+        GL_NONE };

 #  else
 #  else

-            None };
+        None };

 #  endif
 #endif
 
 #  endif
 #endif
 

-  if(!doubleBuffer)
-   {
-      printf("don't have double buffer, disabling\n");
+    if (!g_doubleBuffer)
+    {
+        wxLogWarning("Disabling double buffering");
+

 #ifdef __WXGTK__
 #ifdef __WXGTK__

-      gl_attrib[9] = None;
+        gl_attrib[9] = None;

 #endif
 #endif

-      doubleBuffer = GL_FALSE;
-  }
- 
-  frame->m_canvas = new TestGLCanvas(frame, -1, wxDefaultPosition, wxDefaultSize,
-                                     0, "TestGLCanvas", gl_attrib );
-
-  // Show the frame
-  frame->Show(TRUE);
-
-  frame->m_canvas->SetCurrent();
-  read_surface( "isosurf.dat" );
+        g_doubleBuffer = GL_FALSE;
+    }

 
 

-  Init();
+    // Show the frame
+    Show(true);

 
 

-  return TRUE;
+    m_canvas = new TestGLCanvas(this, wxID_ANY, gl_attrib);

 }
 
 }
 

-BEGIN_EVENT_TABLE(MyFrame, wxFrame)
-    EVT_MENU(wxID_EXIT, MyFrame::OnExit)
-END_EVENT_TABLE()
-
-// My frame constructor
-MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
-    const wxSize& size, long style):
-  wxFrame(frame, -1, title, pos, size, style)
+MyFrame::~MyFrame()

 {
 {

-    m_canvas = NULL;
+    delete m_canvas;

 }
 
 // Intercept menu commands
 }
 
 // Intercept menu commands

-void MyFrame::OnExit(wxCommandEvent& event)
+void MyFrame::OnExit( wxCommandEvent& WXUNUSED(event) )

 {
 {

-    Destroy();
+    // true is to force the frame to close
+    Close(true);

 }
 
 }
 

-/*
- * TestGLCanvas implementation
- */
+
+//---------------------------------------------------------------------------
+// TestGLCanvas
+//---------------------------------------------------------------------------

 
 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
     EVT_SIZE(TestGLCanvas::OnSize)
     EVT_PAINT(TestGLCanvas::OnPaint)
     EVT_CHAR(TestGLCanvas::OnChar)
     EVT_MOUSE_EVENTS(TestGLCanvas::OnMouseEvent)
 
 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
     EVT_SIZE(TestGLCanvas::OnSize)
     EVT_PAINT(TestGLCanvas::OnPaint)
     EVT_CHAR(TestGLCanvas::OnChar)
     EVT_MOUSE_EVENTS(TestGLCanvas::OnMouseEvent)

-    EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)

 END_EVENT_TABLE()
 
 END_EVENT_TABLE()
 

-TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
-    const wxPoint& pos, const wxSize& size, long style, const wxString& name, int* gl_attrib):
-  wxGLCanvas(parent, id, pos, size, style, name, gl_attrib)
+TestGLCanvas::TestGLCanvas(wxWindow *parent,
+                           wxWindowID id,
+                           int* gl_attrib)
+    : wxGLCanvas(parent, id, gl_attrib)

 {
 {

-   parent->Show(TRUE);
-   SetCurrent();
-
-   /* Make sure server supports the vertex array extension */
-   char* extensions = (char *) glGetString( GL_EXTENSIONS );
-   if (!extensions || !strstr( extensions, "GL_EXT_vertex_array" )) {
-      use_vertex_arrays = GL_FALSE;
-   }
+    m_xrot = 0;
+    m_yrot = 0;
+    m_numverts = 0;
+
+    // Explicitly create a new rendering context instance for this canvas.
+    m_glRC = new wxGLContext(this);
+
+    // Make the new context current (activate it for use) with this canvas.
+    SetCurrent(*m_glRC);
+
+    InitGL();
+    InitMaterials();
+    LoadSurface("isosurf.dat.gz");

 }
 
 }
 

+TestGLCanvas::~TestGLCanvas()
+{
+    delete m_glRC;
+}

 
 

-TestGLCanvas::~TestGLCanvas(void)
+void TestGLCanvas::LoadSurface(const wxString& filename)

 {
 {

+    // FIXME
+    // we need to set english locale to force wxTextInputStream's calls to
+    // wxStrtod to use the point and not the comma as decimal separator...
+    // (the isosurf.dat contains points and not commas)...
+    wxLocale l(wxLANGUAGE_ENGLISH);
+
+    wxZlibInputStream* stream =
+        new wxZlibInputStream(new wxFFileInputStream(filename));
+    if (!stream || !stream->IsOk())
+    {
+        wxLogError("Cannot load '%s' type of files!", filename.c_str());
+        delete stream;
+        return;
+    }
+
+    {
+        // we suppose to have in input a text file containing floating numbers
+        // space/newline-separed... first 3 numbers are the coordinates of a
+        // vertex and the following 3 are the relative vertex normal and so on...
+
+        wxTextInputStream inFile(*stream);
+        m_numverts = 0;
+
+        while (!stream->Eof() && m_numverts < MAXVERTS)// && m_numverts<MAXVERTS)
+        {
+            inFile >> m_verts[m_numverts][0] >> m_verts[m_numverts][1] >> m_verts[m_numverts][2];
+            inFile >> m_norms[m_numverts][0] >> m_norms[m_numverts][1] >> m_norms[m_numverts][2];
+
+            m_numverts++;
+        }
+
+        // discard last vertex; it is a zero caused by the EOF
+        m_numverts--;
+    }
+
+    delete stream;
+
+    wxLogMessage(wxT("Loaded %d vertices, %d triangles from '%s'"),
+                 m_numverts, m_numverts-2, filename.c_str());
+
+    // NOTE: for some reason under wxGTK the following is required to avoid that
+    //       the surface gets rendered in a small rectangle in the top-left corner of the frame
+    PostSizeEventToParent();

 }
 
 }
 

-void TestGLCanvas::OnPaint( wxPaintEvent& event )
+void TestGLCanvas::OnPaint( wxPaintEvent& WXUNUSED(event) )

 {
     // This is a dummy, to avoid an endless succession of paint messages.
     // OnPaint handlers must always create a wxPaintDC.
     wxPaintDC dc(this);
 
 {
     // This is a dummy, to avoid an endless succession of paint messages.
     // OnPaint handlers must always create a wxPaintDC.
     wxPaintDC dc(this);
 

-#ifndef __WXMOTIF__
-    if (!GetContext()) return;
-#endif
+    // This is normally only necessary if there is more than one wxGLCanvas
+    // or more than one wxGLContext in the application.
+    SetCurrent(*m_glRC);

 
 

-    SetCurrent();
+    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+    glPushMatrix();
+    glRotatef( m_yrot, 0.0f, 1.0f, 0.0f );
+    glRotatef( m_xrot, 1.0f, 0.0f, 0.0f );
+
+    // draw the surface
+    if (g_use_vertex_arrays)
+    {
+        glDrawArrays( GL_TRIANGLE_STRIP, 0, m_numverts );
+    }
+    else
+    {
+        glBegin( GL_TRIANGLE_STRIP );
+
+        for (int i=0;i<m_numverts;i++)
+        {
+            glNormal3fv( m_norms[i] );
+            glVertex3fv( m_verts[i] );
+        }
+
+        glEnd();
+    }
+
+    glPopMatrix();
+    glFlush(); // Not really necessary: buffer swapping below implies glFlush()

 
 

-    draw1();

     SwapBuffers();
 }
 
 void TestGLCanvas::OnSize(wxSizeEvent& event)
 {
     SwapBuffers();
 }
 
 void TestGLCanvas::OnSize(wxSizeEvent& event)
 {

-    // this is also necessary to update the context on some platforms
-    wxGLCanvas::OnSize(event);
-    
-    // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
-    int w, h;
-    GetClientSize(&w, &h);
-#ifndef __WXMOTIF__
-    if (GetContext())
-#endif
-    {
-        SetCurrent();
-        glViewport(0, 0, (GLint) w, (GLint) h);
-    }
+    // This is normally only necessary if there is more than one wxGLCanvas
+    // or more than one wxGLContext in the application.
+    SetCurrent(*m_glRC);
+
+    // It's up to the application code to update the OpenGL viewport settings.
+    // This is OK here only because there is only one canvas that uses the
+    // context. See the cube sample for that case that multiple canvases are
+    // made current with one context.
+    glViewport(0, 0, event.GetSize().x, event.GetSize().y);

 }
 
 void TestGLCanvas::OnChar(wxKeyEvent& event)
 {
 }
 
 void TestGLCanvas::OnChar(wxKeyEvent& event)
 {

-    switch(event.KeyCode()) {
+    switch( event.GetKeyCode() )
+    {

     case WXK_ESCAPE:
     case WXK_ESCAPE:

-    exit(0);
+        wxTheApp->ExitMainLoop();
+        return;
+

     case WXK_LEFT:
     case WXK_LEFT:

-    yrot -= 15.0;
-    break;
+        m_yrot -= 15.0;
+        break;
+

     case WXK_RIGHT:
     case WXK_RIGHT:

-    yrot += 15.0;
-    break;
+        m_yrot += 15.0;
+        break;
+

     case WXK_UP:
     case WXK_UP:

-    xrot += 15.0;
-    break;
+        m_xrot += 15.0;
+        break;
+

     case WXK_DOWN:
     case WXK_DOWN:

-    xrot -= 15.0;
-    break;
+        m_xrot -= 15.0;
+        break;
+

     case 's': case 'S':
     case 's': case 'S':

-    smooth = !smooth;
-    if (smooth) {
-        glShadeModel(GL_SMOOTH);
-    } else {
-        glShadeModel(GL_FLAT);
-    }
-    break;
+        g_smooth = !g_smooth;
+        if (g_smooth)
+            glShadeModel(GL_SMOOTH);
+        else
+            glShadeModel(GL_FLAT);
+        break;
+

     case 'l': case 'L':
     case 'l': case 'L':

-    lighting = !lighting;
-    if (lighting) {
-        glEnable(GL_LIGHTING);
-    } else {
-        glDisable(GL_LIGHTING);
-    }
-    break;
-     default:
-      {
+        g_lighting = !g_lighting;
+        if (g_lighting)
+            glEnable(GL_LIGHTING);
+        else
+            glDisable(GL_LIGHTING);
+        break;
+
+    default:

         event.Skip();
         event.Skip();

-    return;
-      }
+        return;

     }
 
     }
 

-    Refresh(FALSE);
+    Refresh(false);

 }
 
 void TestGLCanvas::OnMouseEvent(wxMouseEvent& event)
 }
 
 void TestGLCanvas::OnMouseEvent(wxMouseEvent& event)


@@ -425,23 +343,90 @@ void TestGLCanvas::OnMouseEvent(wxMouseEvent& event)
     static int dragging = 0;
     static float last_x, last_y;
 
     static int dragging = 0;
     static float last_x, last_y;
 

-    //printf("%f %f %d\n", event.GetX(), event.GetY(), (int)event.LeftIsDown());
-    if(event.LeftIsDown()) {
-    if(!dragging) {
-        dragging = 1;
-    } else {
-        yrot += (event.GetX() - last_x)*1.0;
-        xrot += (event.GetY() - last_y)*1.0;
-        Refresh(FALSE);
+    // Allow default processing to happen, or else the canvas cannot gain focus
+    // (for key events).
+    event.Skip();
+
+    if (event.LeftIsDown())
+    {
+        if (!dragging)
+        {
+            dragging = 1;
+        }
+        else
+        {
+            m_yrot += (event.GetX() - last_x)*1.0;
+            m_xrot += (event.GetY() - last_y)*1.0;
+            Refresh(false);
+        }
+        last_x = event.GetX();
+        last_y = event.GetY();

     }
     }

-    last_x = event.GetX();
-    last_y = event.GetY();
-    } else
-    dragging = 0;
+    else
+    {
+        dragging = 0;
+    }
+}
+
+void TestGLCanvas::InitMaterials()
+{
+    static const GLfloat ambient[4] = {0.1f, 0.1f, 0.1f, 1.0f};
+    static const GLfloat diffuse[4] = {0.5f, 1.0f, 1.0f, 1.0f};
+    static const GLfloat position0[4] = {0.0f, 0.0f, 20.0f, 0.0f};
+    static const GLfloat position1[4] = {0.0f, 0.0f, -20.0f, 0.0f};
+    static const GLfloat front_mat_shininess[1] = {60.0f};
+    static const GLfloat front_mat_specular[4] = {0.2f, 0.2f, 0.2f, 1.0f};
+    static const GLfloat front_mat_diffuse[4] = {0.5f, 0.28f, 0.38f, 1.0f};
+    /*
+    static const GLfloat back_mat_shininess[1] = {60.0f};
+    static const GLfloat back_mat_specular[4] = {0.5f, 0.5f, 0.2f, 1.0f};
+    static const GLfloat back_mat_diffuse[4] = {1.0f, 1.0f, 0.2f, 1.0f};
+    */
+    static const GLfloat lmodel_ambient[4] = {1.0f, 1.0f, 1.0f, 1.0f};
+    static const GLfloat lmodel_twoside[1] = {GL_FALSE};
+
+    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
+    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
+    glLightfv(GL_LIGHT0, GL_POSITION, position0);
+    glEnable(GL_LIGHT0);
+
+    glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
+    glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
+    glLightfv(GL_LIGHT1, GL_POSITION, position1);
+    glEnable(GL_LIGHT1);
+
+    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
+    glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
+    glEnable(GL_LIGHTING);
+
+    glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
+    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
+    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);

 }
 
 }
 

-void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
+void TestGLCanvas::InitGL()

 {
 {

-    // Do nothing, to avoid flashing.
+    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+
+    glShadeModel(GL_SMOOTH);
+    glEnable(GL_DEPTH_TEST);
+
+    InitMaterials();
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef( 0.0, 0.0, -6.0 );
+
+    if (g_use_vertex_arrays)
+    {
+        glVertexPointer( 3, GL_FLOAT, 0, m_verts );
+        glNormalPointer( GL_FLOAT, 0, m_norms );
+        glEnable( GL_VERTEX_ARRAY );
+        glEnable( GL_NORMAL_ARRAY );
+    }

 }
 
 }