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