在wxWidgets中启用OpenGL

#include <wx/glcanvas.h>

class MyGLCanvas : public wxGLCanvas
{
public:
    MyGLCanvas(wxWindow *parent, wxWindowID id = wxID_ANY, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = 0, const wxString& name = wxGLCanvasName, const int* attribList = 0, const wxPalette& palette = wxNullPalette);
    ~MyGLCanvas();

    void OnPaint(wxPaintEvent& event);
    void OnSize(wxSizeEvent& event);

private:
    DECLARE_EVENT_TABLE()
};

#include <wx/wx.h>
#include <wx/glcanvas.h>

class MyGLCanvas : public wxGLCanvas
{
public:
    MyGLCanvas(wxWindow *parent, wxWindowID id = wxID_ANY, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = 0, const wxString& name = wxGLCanvasName, const int* attribList = 0, const wxPalette& palette = wxNullPalette);
    ~MyGLCanvas();

    void OnPaint(wxPaintEvent& event);
    void OnSize(wxSizeEvent& event);

private:
    DECLARE_EVENT_TABLE()
};

MyGLCanvas::MyGLCanvas(wxWindow *parent, wxWindowID id, const wxPoint& pos, const wxSize& size, long style, const wxString& name, const int* attribList, const wxPalette& palette)
    : wxGLCanvas(parent, id, pos, size, style, name, attribList, palette)
{
    Connect(wxEVT_PAINT, wxPaintEventHandler(MyGLCanvas::OnPaint));
    Connect(wxEVT_SIZE, wxSizeEventHandler(MyGLCanvas::OnSize));
}

MyGLCanvas::~MyGLCanvas()
{
}

void MyGLCanvas::OnPaint(wxPaintEvent& event)
{
    wxPaintDC dc(this);

    // Initialize OpenGL rendering context
    wxGLContext* context = GetContext();
    context->SetCurrent(*this);

    // Clear the color buffer
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    // Draw your scene here

    // Swap the front and back buffers
    SwapBuffers();
}

void MyGLCanvas::OnSize(wxSizeEvent& event)
{
    // Set the viewport and projection matrix for OpenGL rendering
    wxGLContext* context = GetContext();
    context->SetCurrent(*this);

    int w, h;
    GetClientSize(&w, &h);

    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0, (GLfloat)w / (GLfloat)h, 1.0, 100.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

BEGIN_EVENT_TABLE(MyGLCanvas, wxGLCanvas)
    EVT_PAINT(MyGLCanvas::OnPaint)
    EVT_SIZE(MyGLCanvas::OnSize)
END_EVENT_TABLE()

class MyApp : public wxApp
{
public:
    virtual bool OnInit();
};

bool MyApp::OnInit()
{
    wxFrame* frame = new wxFrame(NULL, wxID_ANY, wxT("OpenGL Example"), wxDefaultPosition, wxSize(640, 480));
    MyGLCanvas* canvas = new MyGLCanvas(frame);

    frame->Show(true);

    return true;
}

wxIMPLEMENT_APP(MyApp);