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Problem with wxWindows and OpenGL

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I''ve been trying to port the NeHe tutorials to wxWindows. I''m pulling my hair out trying to figure out what is wrong with my code. It works fine until I try to do a glTranslatef in the Z axis. Translations in the X and Y axis work fine. When I do a translation in the Z direction, however, the triangle I''m trying to render doesn''t appear. The demo programs that come with wxWindows work, so I must just be missing something. If anyone has a minute to look at the following I would be very, very appreciative. The code I''m referring to is the last function listed here: nehe-two.h: #ifndef _NEHE_TWO_H_ #define _NEHE_TWO_H_ #include <wx/glcanvas.h> class MyApp: public wxApp { public: virtual bool OnInit(); }; class MyGLCanvas: public wxGLCanvas { public: MyGLCanvas(wxWindow *parent, const wxWindowID id = -1, const wxPoint &pos = wxDefaultPosition, const wxSize &size = wxDefaultSize, long style = 0, const wxString &name = "TestGLCanvas"); void OnPaint(wxPaintEvent &event); void OnSize(wxSizeEvent &event); void DrawGLScene(); void InitGL(); bool gl_initialized; DECLARE_EVENT_TABLE() }; class MyFrame: public wxFrame { public: MyFrame(wxFrame *frame, const wxString &title, const wxPoint &pos, const wxSize &size, long style = wxDEFAULT_FRAME_STYLE); MyGLCanvas *canvas; }; #endif nehe-two.cpp: #include "wx/wxprec.h" #ifndef WX_PRECOMP #include "wx/wx.h" #endif #include "nehe-two.h" IMPLEMENT_APP(MyApp); MyFrame::MyFrame(wxFrame *frame, const wxString &title, const wxPoint &pos, const wxSize &size, long style) :wxFrame(frame, -1, title, pos, size, style) { canvas = NULL; } BEGIN_EVENT_TABLE(MyGLCanvas, wxGLCanvas) EVT_PAINT(MyGLCanvas::OnPaint) EVT_SIZE(MyGLCanvas::OnSize) END_EVENT_TABLE() MyGLCanvas::MyGLCanvas(wxWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size, long style, const wxString &name): wxGLCanvas(parent, (wxGLCanvas*)NULL, id, pos, size, style, name) { } void MyGLCanvas::OnSize(wxSizeEvent &event) { wxGLCanvas::OnSize(event); GLsizei width = event.GetSize().GetWidth(); GLsizei height = event.GetSize().GetHeight(); glViewport(0, 0, width, height); } void MyGLCanvas::OnPaint(wxPaintEvent &event) { wxPaintDC dc(this); DrawGLScene(); } bool MyApp::OnInit() { MyFrame *frame = new MyFrame(NULL, _("NeHe Lesson Two"), wxPoint(50, 50), wxSize(400, 300)); SetTopWindow(frame); frame->canvas = new MyGLCanvas(frame, -1, wxPoint(0,0), wxSize(200,200)); frame->Show(TRUE); frame->canvas->SetCurrent(); //wxSafeYield(); frame->canvas->InitGL(); return TRUE; } void MyGLCanvas::InitGL() { glShadeModel(GL_SMOOTH); glClearColor(0.0, 0.0, 0.0, 0.0); glClearDepth(1.0); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); } void MyGLCanvas::DrawGLScene() { wxPaintDC dc(this); SetCurrent(); glLoadIdentity(); glMatrixMode(GL_MODELVIEW); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); // If I change this to (0.0, 0.0, 0.0) the triangle // displays fine. (0.0, 0.0, 0.0) to (0.0, 0.0, -1.0) // all display the same as (0.0, 0.0, 0.0). When it gets to // (0.0, 0.0, -1.1) the triangle disappears. glTranslatef(0.0, 0.0, -6.0); glBegin(GL_TRIANGLES); glVertex3f(0.0, 1.0, 0.0); glVertex3f(-1.0, -1.0, 0.0); glVertex3f(1.0, -1.0, 0.0); glEnd(); glFlush(); SwapBuffers(); }

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