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 #ifdef __WXMAC__
  34 #include <glu.h>
  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(void)
  43 {
  44
  45   /* Create the main frame window */
  46   MyFrame *frame = new MyFrame(NULL, "wxWindows OpenGL Demo", wxPoint(50, 50), wxSize(400, 300));
  47
  48   /* Make a menubar */
  49   wxMenu *fileMenu = new wxMenu;
  50
  51   fileMenu->Append(wxID_EXIT, "E&xit");
  52   wxMenuBar *menuBar = new wxMenuBar;
  53   menuBar->Append(fileMenu, "&File");
  54   frame->SetMenuBar(menuBar);
  55
  56   frame->m_canvas = new TestGLCanvas(frame, -1, wxPoint(0, 0), wxSize(200, 200));
  57
  58   /* Load file wiht mesh data */
  59   frame->m_canvas->LoadLWO( "penguin.lwo" );
  60
  61   /* Show the frame */
  62   frame->Show(TRUE);
  63
  64   return TRUE;
  65 }
  66
  67 IMPLEMENT_APP(MyApp)
  68
  69 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  70     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
  71 END_EVENT_TABLE()
  72
  73 /* My frame constructor */
  74 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
  75     const wxSize& size, long style):
  76   wxFrame(frame, -1, title, pos, size, style)
  77 {
  78     m_canvas = NULL;
  79 }
  80
  81 /* Intercept menu commands */
  82 void MyFrame::OnExit(wxCommandEvent& event)
  83 {
  84     Destroy();
  85 }
  86
  87 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
  88     EVT_SIZE(TestGLCanvas::OnSize)
  89     EVT_PAINT(TestGLCanvas::OnPaint)
  90     EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
  91     EVT_MOUSE_EVENTS(TestGLCanvas::OnMouse)
  92 END_EVENT_TABLE()
  93
  94 TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
  95     const wxPoint& pos, const wxSize& size, long style, const wxString& name):
  96   wxGLCanvas(parent, id, pos, size, style, name)
  97 {
  98    block = FALSE;
  99 }
 100
 101 TestGLCanvas::~TestGLCanvas(void)
 102 {
 103     /* destroy mesh */
 104     lw_object_free(info.lwobject);
 105 }
 106
 107 void TestGLCanvas::OnPaint( wxPaintEvent& event )
 108 {
 109     /* must always be here */
 110     wxPaintDC dc(this);
 111
 112 #ifndef __WXMOTIF__
 113     if (!GetContext()) return;
 114 #endif
 115
 116     SetCurrent();
 117
 118     /* initialize OpenGL */
 119     if (info.do_init == TRUE)
 120     {
 121         InitGL();
 122         info.do_init = FALSE;
 123     }
 124
 125     /* view */
 126     glMatrixMode( GL_PROJECTION );
 127     glLoadIdentity();
 128     gluPerspective( info.zoom, VIEW_ASPECT, 1, 100 );
 129     glMatrixMode( GL_MODELVIEW );
 130
 131     /* clear */
 132     glClearColor( .3, .4, .6, 1 );
 133     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 134
 135     /* transformations */
 136     GLfloat m[4][4];
 137     glLoadIdentity();
 138     glTranslatef( 0, 0, -30 );
 139     build_rotmatrix( m,info.quat );
 140     glMultMatrixf( &m[0][0] );
 141
 142     /* draw object */
 143     lw_object_show( info.lwobject );
 144
 145     /* flush */
 146     glFlush();
 147
 148     /* swap */
 149     SwapBuffers();
 150 }
 151
 152 void TestGLCanvas::OnSize(wxSizeEvent& event)
 153 {
 154     // the viewport must be initialized this way, not glViewport
 155     // this is also necessary to update the context on some platforms
 156     wxGLCanvas::OnSize(event);
 157 }
 158
 159 void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
 160 {
 161     /* Do nothing, to avoid flashing on MSW */
 162 }
 163
 164 void TestGLCanvas::LoadLWO(const wxString &filename)
 165 {
 166     /* test if lightwave object */
 167     if (!lw_is_lwobject(filename)) return;
 168
 169     /* read lightwave object */
 170     lwObject *lwobject = lw_object_read(filename);
 171
 172     /* scale */
 173     lw_object_scale(lwobject, 10.0 / lw_object_radius(lwobject));
 174
 175     /* set up mesh info */
 176     info.do_init = TRUE;
 177     info.lwobject = lwobject;
 178     info.beginx = 0;
 179     info.beginy = 0;
 180     info.zoom   = 45;
 181     trackball( info.quat, 0.0, 0.0, 0.0, 0.0 );
 182 }
 183
 184 void TestGLCanvas::OnMouse( wxMouseEvent& event )
 185 {
 186     wxSize sz(GetClientSize());
 187     if (event.Dragging())
 188     {
 189         /* drag in progress, simulate trackball */
 190         float spin_quat[4];
 191         trackball(spin_quat,
 192               (2.0*info.beginx -       sz.x) / sz.x,
 193               (     sz.y - 2.0*info.beginy) / sz.y,
 194               (     2.0*event.GetX() - sz.x) / sz.x,
 195               (    sz.y - 2.0*event.GetY()) / sz.y);
 196
 197         add_quats( spin_quat, info.quat, info.quat );
 198
 199         /* orientation has changed, redraw mesh */
 200         Refresh(FALSE);
 201     }
 202
 203     info.beginx = event.GetX();
 204     info.beginy = event.GetY();
 205 }
 206
 207 void TestGLCanvas::InitGL(void)
 208 {
 209     GLfloat light0_pos[4]   = { -50.0, 50.0, 0.0, 0.0 };
 210     GLfloat light0_color[4] = { .6, .6, .6, 1.0 }; /* white light */
 211     GLfloat light1_pos[4]   = {  50.0, 50.0, 0.0, 0.0 };
 212     GLfloat light1_color[4] = { .4, .4, 1, 1.0 };  /* cold blue light */
 213
 214     /* remove back faces */
 215     glDisable(GL_CULL_FACE);
 216     glEnable(GL_DEPTH_TEST);
 217
 218     /* speedups */
 219     glEnable(GL_DITHER);
 220     glShadeModel(GL_SMOOTH);
 221     glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
 222     glHint(GL_POLYGON_SMOOTH_HINT, GL_FASTEST);
 223
 224     /* light */
 225     glLightfv(GL_LIGHT0, GL_POSITION, light0_pos);
 226     glLightfv(GL_LIGHT0, GL_DIFFUSE,  light0_color);
 227     glLightfv(GL_LIGHT1, GL_POSITION, light1_pos);
 228     glLightfv(GL_LIGHT1, GL_DIFFUSE,  light1_color);
 229     glEnable(GL_LIGHT0);
 230     glEnable(GL_LIGHT1);
 231     glEnable(GL_LIGHTING);
 232
 233     glColorMaterial(GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE);
 234     glEnable(GL_COLOR_MATERIAL);
 235 }
 236
 237