samples/opengl/penguin/penguin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        penguin.cpp
   3 // Purpose:     wxGLCanvas demo program
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #pragma interface
  15 #endif
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #ifdef __BORLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WX_PRECOMP
  25 #include "wx/wx.h"
  26 #endif
  27
  28 #include "penguin.h"
  29 #ifdef __WXMAC__
  30 #  ifdef __DARWIN__
  31 #    include <OpenGL/glu.h>
  32 #  else
  33 #    include <glu.h>
  34 #  endif
  35 #else
  36 #  include <GL/glu.h>
  37 #endif
  38
  39 #define VIEW_ASPECT 1.3
  40
  41 // `Main program' equivalent, creating windows and returning main app frame
  42 bool MyApp::OnInit()
  43 {
  44
  45     // Create the main frame window
  46     MyFrame *frame = new MyFrame(NULL, wxT("wxWidgets OpenGL Penguin Sample"),
  47         wxDefaultPosition, wxDefaultSize);
  48
  49     /* Make a menubar */
  50     wxMenu *fileMenu = new wxMenu;
  51
  52     fileMenu->Append(wxID_EXIT, wxT("E&xit"));
  53     wxMenuBar *menuBar = new wxMenuBar;
  54     menuBar->Append(fileMenu, wxT("&File"));
  55     frame->SetMenuBar(menuBar);
  56
  57 #if wxUSE_GLCANVAS
  58     frame->SetCanvas( new TestGLCanvas(frame, wxID_ANY, wxDefaultPosition,
  59         wxSize(200, 200), wxSUNKEN_BORDER) );
  60
  61     /* Load file wiht mesh data */
  62     frame->GetCanvas()->LoadLWO( wxT("penguin.lwo") );
  63
  64     /* Show the frame */
  65     frame->Show(true);
  66
  67     return true;
  68 #else
  69
  70     wxMessageBox( _T("This sample has to be compiled with wxUSE_GLCANVAS"),
  71         _T("Building error"), wxOK);
  72
  73     return false;
  74
  75 #endif
  76 }
  77
  78 IMPLEMENT_APP(MyApp)
  79
  80 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  81     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
  82 END_EVENT_TABLE()
  83
  84 /* My frame constructor */
  85 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
  86     const wxSize& size, long style)
  87     : wxFrame(frame, wxID_ANY, title, pos, size, style)
  88 {
  89 #if wxUSE_GLCANVAS
  90     m_canvas = NULL;
  91 #endif
  92 }
  93
  94 /* Intercept menu commands */
  95 void MyFrame::OnExit( wxCommandEvent& WXUNUSED(event) )
  96 {
  97     // true is to force the frame to close
  98     Close(true);
  99 }
 100
 101 #if wxUSE_GLCANVAS
 102
 103 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
 104     EVT_SIZE(TestGLCanvas::OnSize)
 105     EVT_PAINT(TestGLCanvas::OnPaint)
 106     EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
 107     EVT_MOUSE_EVENTS(TestGLCanvas::OnMouse)
 108 END_EVENT_TABLE()
 109
 110 TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
 111     const wxPoint& pos, const wxSize& size, long style, const wxString& name)
 112     : wxGLCanvas(parent, id, pos, size, style, name)
 113 {
 114     block = false;
 115 }
 116
 117 TestGLCanvas::~TestGLCanvas()
 118 {
 119     /* destroy mesh */
 120     lw_object_free(info.lwobject);
 121 }
 122
 123 void TestGLCanvas::OnPaint( wxPaintEvent& WXUNUSED(event) )
 124 {
 125     /* must always be here */
 126     wxPaintDC dc(this);
 127
 128 #ifndef __WXMOTIF__
 129     if (!GetContext()) return;
 130 #endif
 131
 132     SetCurrent();
 133
 134     // Initialize OpenGL
 135     if (info.do_init)
 136     {
 137         InitGL();
 138         info.do_init = false;
 139     }
 140
 141     // View
 142     glMatrixMode( GL_PROJECTION );
 143     glLoadIdentity();
 144     gluPerspective( info.zoom, VIEW_ASPECT, 1.0, 100.0 );
 145     glMatrixMode( GL_MODELVIEW );
 146
 147     // Clear
 148     glClearColor( 0.3f, 0.4f, 0.6f, 1.0f );
 149     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 150
 151     // Transformations
 152     GLfloat m[4][4];
 153     glLoadIdentity();
 154     glTranslatef( 0.0f, 0.0f, -30.0f );
 155     build_rotmatrix( m,info.quat );
 156     glMultMatrixf( &m[0][0] );
 157
 158     // Draw object
 159     lw_object_show( info.lwobject );
 160
 161     // Flush
 162     glFlush();
 163
 164     // Swap
 165     SwapBuffers();
 166 }
 167
 168 void TestGLCanvas::OnSize(wxSizeEvent& event)
 169 {
 170     // this is also necessary to update the context on some platforms
 171     wxGLCanvas::OnSize(event);
 172
 173     // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
 174     int w, h;
 175     GetClientSize(&w, &h);
 176 #ifndef __WXMOTIF__
 177     if ( GetContext() )
 178 #endif
 179     {
 180         SetCurrent();
 181         glViewport(0, 0, (GLint) w, (GLint) h);
 182     }
 183 }
 184
 185 void TestGLCanvas::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 186 {
 187     /* Do nothing, to avoid flashing on MSW */
 188 }
 189
 190 void TestGLCanvas::LoadLWO(const wxString &filename)
 191 {
 192     /* test if lightwave object */
 193     if (!lw_is_lwobject(filename.mb_str())) return;
 194
 195     /* read lightwave object */
 196     lwObject *lwobject = lw_object_read(filename.mb_str());
 197
 198     /* scale */
 199     lw_object_scale(lwobject, 10.0 / lw_object_radius(lwobject));
 200
 201     /* set up mesh info */
 202     info.do_init = true;
 203     info.lwobject = lwobject;
 204     info.beginx = 0.0f;
 205     info.beginy = 0.0f;
 206     info.zoom   = 45.0f;
 207     trackball( info.quat, 0.0f, 0.0f, 0.0f, 0.0f );
 208 }
 209
 210 void TestGLCanvas::OnMouse( wxMouseEvent& event )
 211 {
 212
 213     if ( event.Dragging() )
 214     {
 215         wxSize sz( GetClientSize() );
 216
 217         /* drag in progress, simulate trackball */
 218         float spin_quat[4];
 219         trackball(spin_quat,
 220             (2.0*info.beginx -       sz.x) / sz.x,
 221             (     sz.y - 2.0*info.beginy) / sz.y,
 222             (     2.0*event.GetX() - sz.x) / sz.x,
 223             (    sz.y - 2.0*event.GetY()) / sz.y);
 224
 225         add_quats( spin_quat, info.quat, info.quat );
 226
 227         /* orientation has changed, redraw mesh */
 228         Refresh(false);
 229     }
 230
 231     info.beginx = event.GetX();
 232     info.beginy = event.GetY();
 233 }
 234
 235 void TestGLCanvas::InitGL()
 236 {
 237     static const GLfloat light0_pos[4]   = { -50.0f, 50.0f, 0.0f, 0.0f };
 238
 239     // white light
 240     static const GLfloat light0_color[4] = { 0.6f, 0.6f, 0.6f, 1.0f };
 241
 242     static const GLfloat light1_pos[4]   = {  50.0f, 50.0f, 0.0f, 0.0f };
 243
 244     // cold blue light
 245     static const GLfloat light1_color[4] = { 0.4f, 0.4f, 1.0f, 1.0f };
 246
 247     /* remove back faces */
 248     glDisable(GL_CULL_FACE);
 249     glEnable(GL_DEPTH_TEST);
 250
 251     /* speedups */
 252     glEnable(GL_DITHER);
 253     glShadeModel(GL_SMOOTH);
 254     glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
 255     glHint(GL_POLYGON_SMOOTH_HINT, GL_FASTEST);
 256
 257     /* light */
 258     glLightfv(GL_LIGHT0, GL_POSITION, light0_pos);
 259     glLightfv(GL_LIGHT0, GL_DIFFUSE,  light0_color);
 260     glLightfv(GL_LIGHT1, GL_POSITION, light1_pos);
 261     glLightfv(GL_LIGHT1, GL_DIFFUSE,  light1_color);
 262     glEnable(GL_LIGHT0);
 263     glEnable(GL_LIGHT1);
 264     glEnable(GL_LIGHTING);
 265
 266     glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
 267     glEnable(GL_COLOR_MATERIAL);
 268 }
 269
 270
 271 #endif // #if wxUSE_GLCANVAS