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 #if !wxUSE_GLCANVAS
  29 #error Please set wxUSE_GLCANVAS to 1 in setup.h.
  30 #endif
  31
  32 #include "penguin.h"
  33 #include <GL/glu.h>
  34
  35 #define VIEW_ASPECT 1.3
  36
  37 /* `Main program' equivalent, creating windows and returning main app frame */
  38 bool MyApp::OnInit(void)
  39 {
  40
  41   /* Create the main frame window */
  42   MyFrame *frame = new MyFrame(NULL, "wxWindows OpenGL Demo", wxPoint(50, 50), wxSize(400, 300));
  43
  44   /* Make a menubar */
  45   wxMenu *fileMenu = new wxMenu;
  46
  47   fileMenu->Append(wxID_EXIT, "E&xit");
  48   wxMenuBar *menuBar = new wxMenuBar;
  49   menuBar->Append(fileMenu, "&File");
  50   frame->SetMenuBar(menuBar);
  51
  52   frame->m_canvas = new TestGLCanvas(frame, -1, wxPoint(0, 0), wxSize(200, 200));
  53
  54   /* Load file wiht mesh data */
  55   frame->m_canvas->LoadLWO( "penguin.lwo" );
  56
  57   /* Show the frame */
  58   frame->Show(TRUE);
  59
  60   return TRUE;
  61 }
  62
  63 IMPLEMENT_APP(MyApp)
  64
  65 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  66     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
  67 END_EVENT_TABLE()
  68
  69 /* My frame constructor */
  70 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
  71     const wxSize& size, long style):
  72   wxFrame(frame, -1, title, pos, size, style)
  73 {
  74     m_canvas = NULL;
  75 }
  76
  77 /* Intercept menu commands */
  78 void MyFrame::OnExit(wxCommandEvent& event)
  79 {
  80     Destroy();
  81 }
  82
  83 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
  84     EVT_SIZE(TestGLCanvas::OnSize)
  85     EVT_PAINT(TestGLCanvas::OnPaint)
  86     EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
  87     EVT_MOUSE_EVENTS(TestGLCanvas::OnMouse)
  88 END_EVENT_TABLE()
  89
  90 TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
  91     const wxPoint& pos, const wxSize& size, long style, const wxString& name):
  92   wxGLCanvas(parent, id, pos, size, style, name)
  93 {
  94    block = FALSE;
  95 }
  96
  97 TestGLCanvas::~TestGLCanvas(void)
  98 {
  99     /* destroy mesh */
 100     lw_object_free(info.lwobject);
 101 }
 102
 103 void TestGLCanvas::OnPaint( wxPaintEvent& event )
 104 {
 105     /* must always be here */
 106     wxPaintDC dc(this);
 107
 108 #ifndef __WXMOTIF__
 109     if (!GetContext()) return;
 110 #endif
 111
 112     SetCurrent();
 113
 114     /* initialize OpenGL */
 115     if (info.do_init == TRUE)
 116     {
 117         InitGL();
 118         info.do_init = FALSE;
 119     }
 120
 121     /* view */
 122     glMatrixMode( GL_PROJECTION );
 123     glLoadIdentity();
 124     gluPerspective( info.zoom, VIEW_ASPECT, 1, 100 );
 125     glMatrixMode( GL_MODELVIEW );
 126
 127     /* clear */
 128     glClearColor( .3, .4, .6, 1 );
 129     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 130
 131     /* transformations */
 132     GLfloat m[4][4];
 133     glLoadIdentity();
 134     glTranslatef( 0, 0, -30 );
 135     build_rotmatrix( m,info.quat );
 136     glMultMatrixf( &m[0][0] );
 137
 138     /* draw object */
 139     lw_object_show( info.lwobject );
 140
 141     /* flush */
 142     glFlush();
 143
 144     /* swap */
 145     SwapBuffers();
 146 }
 147
 148 void TestGLCanvas::OnSize(wxSizeEvent& event)
 149 {
 150     int width, height;
 151     GetClientSize(& width, & height);
 152
 153 #ifndef __WXMOTIF__
 154     if (GetContext())
 155 #endif
 156     {
 157         SetCurrent();
 158         glViewport(0, 0, width, height);
 159     }
 160 }
 161
 162 void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
 163 {
 164     /* Do nothing, to avoid flashing on MSW */
 165 }
 166
 167 void TestGLCanvas::LoadLWO(const wxString &filename)
 168 {
 169     /* test if lightwave object */
 170     if (!lw_is_lwobject(filename)) return;
 171
 172     /* read lightwave object */
 173     lwObject *lwobject = lw_object_read(filename);
 174
 175     /* scale */
 176     lw_object_scale(lwobject, 10.0 / lw_object_radius(lwobject));
 177
 178     /* set up mesh info */
 179     info.do_init = TRUE;
 180     info.lwobject = lwobject;
 181     info.beginx = 0;
 182     info.beginy = 0;
 183     info.zoom   = 45;
 184     trackball( info.quat, 0.0, 0.0, 0.0, 0.0 );
 185 }
 186
 187 void TestGLCanvas::OnMouse( wxMouseEvent& event )
 188 {
 189     wxSize sz(GetClientSize());
 190     if (event.Dragging())
 191     {
 192         /* drag in progress, simulate trackball */
 193         float spin_quat[4];
 194         trackball(spin_quat,
 195               (2.0*info.beginx -       sz.x) / sz.x,
 196               (     sz.y - 2.0*info.beginy) / sz.y,
 197               (     2.0*event.GetX() - sz.x) / sz.x,
 198               (    sz.y - 2.0*event.GetY()) / sz.y);
 199
 200         add_quats( spin_quat, info.quat, info.quat );
 201
 202         /* orientation has changed, redraw mesh */
 203         Refresh(FALSE);
 204     }
 205
 206     info.beginx = event.GetX();
 207     info.beginy = event.GetY();
 208 }
 209
 210 void TestGLCanvas::InitGL(void)
 211 {
 212     GLfloat light0_pos[4]   = { -50.0, 50.0, 0.0, 0.0 };
 213     GLfloat light0_color[4] = { .6, .6, .6, 1.0 }; /* white light */
 214     GLfloat light1_pos[4]   = {  50.0, 50.0, 0.0, 0.0 };
 215     GLfloat light1_color[4] = { .4, .4, 1, 1.0 };  /* cold blue light */
 216
 217     /* remove back faces */
 218     glDisable(GL_CULL_FACE);
 219     glEnable(GL_DEPTH_TEST);
 220
 221     /* speedups */
 222     glEnable(GL_DITHER);
 223     glShadeModel(GL_SMOOTH);
 224     glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
 225     glHint(GL_POLYGON_SMOOTH_HINT, GL_FASTEST);
 226
 227     /* light */
 228     glLightfv(GL_LIGHT0, GL_POSITION, light0_pos);
 229     glLightfv(GL_LIGHT0, GL_DIFFUSE,  light0_color);
 230     glLightfv(GL_LIGHT1, GL_POSITION, light1_pos);
 231     glLightfv(GL_LIGHT1, GL_DIFFUSE,  light1_color);
 232     glEnable(GL_LIGHT0);
 233     glEnable(GL_LIGHT1);
 234     glEnable(GL_LIGHTING);
 235
 236     glColorMaterial(GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE);
 237     glEnable(GL_COLOR_MATERIAL);
 238 }
 239
 240