samples/opengl/isosurf/isosurf.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        isosurf.cpp
   3 // Purpose:     wxGLCanvas demo program
   4 // Author:      Brian Paul (original gltk version), Wolfram Gloger
   5 // Modified by: Julian Smart, Francesco Montorsi
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16 #pragma hdrstop
  17 #endif
  18
  19 #ifndef WX_PRECOMP
  20 #include "wx/wx.h"
  21 #endif
  22
  23 #if !wxUSE_GLCANVAS
  24     #error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
  25 #endif
  26
  27 #include "wx/timer.h"
  28 #include "wx/glcanvas.h"
  29 #include "wx/math.h"
  30 #include "wx/log.h"
  31 #include "wx/cmdline.h"
  32 #include "wx/wfstream.h"
  33 #include "wx/zstream.h"
  34 #include "wx/txtstrm.h"
  35
  36 #include "isosurf.h"
  37 #include "../../sample.xpm"
  38
  39
  40 // global options which can be set through command-line options
  41 GLboolean g_use_vertex_arrays = GL_FALSE;
  42 GLboolean g_doubleBuffer = GL_TRUE;
  43 GLboolean g_smooth = GL_TRUE;
  44 GLboolean g_lighting = GL_TRUE;
  45
  46
  47
  48 //---------------------------------------------------------------------------
  49 // MyApp
  50 //---------------------------------------------------------------------------
  51
  52 IMPLEMENT_APP(MyApp)
  53
  54 bool MyApp::OnInit()
  55 {
  56     if ( !wxApp::OnInit() )
  57         return false;
  58
  59     // Create the main frame window
  60     SetTopWindow(new MyFrame(NULL, wxT("wxWidgets OpenGL Isosurf Sample")));
  61
  62     return true;
  63 }
  64
  65 void MyApp::OnInitCmdLine(wxCmdLineParser& parser)
  66 {
  67     parser.AddSwitch("", "sb", "Do not use double buffering");
  68     parser.AddSwitch("", "db", "Use double buffering");
  69     parser.AddSwitch("", "va", "Use vertex arrays");
  70
  71     wxApp::OnInitCmdLine(parser);
  72 }
  73
  74 bool MyApp::OnCmdLineParsed(wxCmdLineParser& parser)
  75 {
  76     if (parser.Found("sb"))
  77         g_doubleBuffer = GL_FALSE;
  78     else if (parser.Found("db"))
  79         g_doubleBuffer = GL_TRUE;
  80
  81     if (parser.Found("va"))
  82         g_use_vertex_arrays = GL_TRUE;
  83
  84     return wxApp::OnCmdLineParsed(parser);
  85 }
  86
  87 //---------------------------------------------------------------------------
  88 // MyFrame
  89 //---------------------------------------------------------------------------
  90
  91 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  92     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
  93 END_EVENT_TABLE()
  94
  95 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
  96                  const wxSize& size, long style)
  97     : wxFrame(frame, wxID_ANY, title, pos, size, style),
  98       m_canvas(NULL)
  99 {
 100     SetIcon(wxICON(sample));
 101
 102
 103     // Make a menubar
 104     wxMenu *fileMenu = new wxMenu;
 105
 106     fileMenu->Append(wxID_EXIT, wxT("E&xit"));
 107     wxMenuBar *menuBar = new wxMenuBar;
 108     menuBar->Append(fileMenu, wxT("&File"));
 109     SetMenuBar(menuBar);
 110
 111
 112   // Make a TestGLCanvas
 113
 114   // JACS
 115 #ifdef __WXMSW__
 116     int *gl_attrib = NULL;
 117 #else
 118     int gl_attrib[20] =
 119         { WX_GL_RGBA, WX_GL_MIN_RED, 1, WX_GL_MIN_GREEN, 1,
 120         WX_GL_MIN_BLUE, 1, WX_GL_DEPTH_SIZE, 1,
 121         WX_GL_DOUBLEBUFFER,
 122 #  if defined(__WXMAC__) || defined(__WXCOCOA__)
 123         GL_NONE };
 124 #  else
 125         None };
 126 #  endif
 127 #endif
 128
 129     if (!g_doubleBuffer)
 130     {
 131         wxLogWarning("Disabling double buffering");
 132
 133 #ifdef __WXGTK__
 134         gl_attrib[9] = None;
 135 #endif
 136         g_doubleBuffer = GL_FALSE;
 137     }
 138
 139     // Show the frame
 140     Show(true);
 141
 142     m_canvas = new TestGLCanvas(this, wxID_ANY, gl_attrib);
 143 }
 144
 145 MyFrame::~MyFrame()
 146 {
 147     delete m_canvas;
 148 }
 149
 150 // Intercept menu commands
 151 void MyFrame::OnExit( wxCommandEvent& WXUNUSED(event) )
 152 {
 153     // true is to force the frame to close
 154     Close(true);
 155 }
 156
 157
 158 //---------------------------------------------------------------------------
 159 // TestGLCanvas
 160 //---------------------------------------------------------------------------
 161
 162 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
 163     EVT_SIZE(TestGLCanvas::OnSize)
 164     EVT_PAINT(TestGLCanvas::OnPaint)
 165     EVT_CHAR(TestGLCanvas::OnChar)
 166     EVT_MOUSE_EVENTS(TestGLCanvas::OnMouseEvent)
 167 END_EVENT_TABLE()
 168
 169 TestGLCanvas::TestGLCanvas(wxWindow *parent,
 170                            wxWindowID id,
 171                            int* gl_attrib)
 172     : wxGLCanvas(parent, id, gl_attrib)
 173 {
 174     m_xrot = 0;
 175     m_yrot = 0;
 176     m_numverts = 0;
 177
 178     // Explicitly create a new rendering context instance for this canvas.
 179     m_glRC = new wxGLContext(this);
 180
 181     // Make the new context current (activate it for use) with this canvas.
 182     SetCurrent(*m_glRC);
 183
 184     InitGL();
 185     InitMaterials();
 186     LoadSurface("isosurf.dat.gz");
 187 }
 188
 189 TestGLCanvas::~TestGLCanvas()
 190 {
 191     delete m_glRC;
 192 }
 193
 194 void TestGLCanvas::LoadSurface(const wxString& filename)
 195 {
 196     // FIXME
 197     // we need to set english locale to force wxTextInputStream's calls to
 198     // wxStrtod to use the point and not the comma as decimal separator...
 199     // (the isosurf.dat contains points and not commas)...
 200     wxLocale l(wxLANGUAGE_ENGLISH);
 201
 202     wxZlibInputStream* stream =
 203         new wxZlibInputStream(new wxFFileInputStream(filename));
 204     if (!stream || !stream->IsOk())
 205     {
 206         wxLogError("Cannot load '%s' type of files!", filename.c_str());
 207         delete stream;
 208         return;
 209     }
 210
 211     {
 212         // we suppose to have in input a text file containing floating numbers
 213         // space/newline-separed... first 3 numbers are the coordinates of a
 214         // vertex and the following 3 are the relative vertex normal and so on...
 215
 216         wxTextInputStream inFile(*stream);
 217         m_numverts = 0;
 218
 219         while (!stream->Eof() && m_numverts < MAXVERTS)// && m_numverts<MAXVERTS)
 220         {
 221             inFile >> m_verts[m_numverts][0] >> m_verts[m_numverts][1] >> m_verts[m_numverts][2];
 222             inFile >> m_norms[m_numverts][0] >> m_norms[m_numverts][1] >> m_norms[m_numverts][2];
 223
 224             m_numverts++;
 225         }
 226
 227         // discard last vertex; it is a zero caused by the EOF
 228         m_numverts--;
 229     }
 230
 231     delete stream;
 232
 233     wxLogMessage(wxT("Loaded %d vertices, %d triangles from '%s'"),
 234                  m_numverts, m_numverts-2, filename.c_str());
 235
 236     // NOTE: for some reason under wxGTK the following is required to avoid that
 237     //       the surface gets rendered in a small rectangle in the top-left corner of the frame
 238     PostSizeEventToParent();
 239 }
 240
 241 void TestGLCanvas::OnPaint( wxPaintEvent& WXUNUSED(event) )
 242 {
 243     // This is a dummy, to avoid an endless succession of paint messages.
 244     // OnPaint handlers must always create a wxPaintDC.
 245     wxPaintDC dc(this);
 246
 247     // This is normally only necessary if there is more than one wxGLCanvas
 248     // or more than one wxGLContext in the application.
 249     SetCurrent(*m_glRC);
 250
 251     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 252     glPushMatrix();
 253     glRotatef( m_yrot, 0.0f, 1.0f, 0.0f );
 254     glRotatef( m_xrot, 1.0f, 0.0f, 0.0f );
 255
 256     // draw the surface
 257     if (g_use_vertex_arrays)
 258     {
 259         glDrawArrays( GL_TRIANGLE_STRIP, 0, m_numverts );
 260     }
 261     else
 262     {
 263         glBegin( GL_TRIANGLE_STRIP );
 264
 265         for (int i=0;i<m_numverts;i++)
 266         {
 267             glNormal3fv( m_norms[i] );
 268             glVertex3fv( m_verts[i] );
 269         }
 270
 271         glEnd();
 272     }
 273
 274     glPopMatrix();
 275     glFlush(); // Not really necessary: buffer swapping below implies glFlush()
 276
 277     SwapBuffers();
 278 }
 279
 280 void TestGLCanvas::OnSize(wxSizeEvent& event)
 281 {
 282     // This is normally only necessary if there is more than one wxGLCanvas
 283     // or more than one wxGLContext in the application.
 284     SetCurrent(*m_glRC);
 285
 286     // It's up to the application code to update the OpenGL viewport settings.
 287     // This is OK here only because there is only one canvas that uses the
 288     // context. See the cube sample for that case that multiple canvases are
 289     // made current with one context.
 290     glViewport(0, 0, event.GetSize().x, event.GetSize().y);
 291 }
 292
 293 void TestGLCanvas::OnChar(wxKeyEvent& event)
 294 {
 295     switch( event.GetKeyCode() )
 296     {
 297     case WXK_ESCAPE:
 298         wxTheApp->ExitMainLoop();
 299         return;
 300
 301     case WXK_LEFT:
 302         m_yrot -= 15.0;
 303         break;
 304
 305     case WXK_RIGHT:
 306         m_yrot += 15.0;
 307         break;
 308
 309     case WXK_UP:
 310         m_xrot += 15.0;
 311         break;
 312
 313     case WXK_DOWN:
 314         m_xrot -= 15.0;
 315         break;
 316
 317     case 's': case 'S':
 318         g_smooth = !g_smooth;
 319         if (g_smooth)
 320             glShadeModel(GL_SMOOTH);
 321         else
 322             glShadeModel(GL_FLAT);
 323         break;
 324
 325     case 'l': case 'L':
 326         g_lighting = !g_lighting;
 327         if (g_lighting)
 328             glEnable(GL_LIGHTING);
 329         else
 330             glDisable(GL_LIGHTING);
 331         break;
 332
 333     default:
 334         event.Skip();
 335         return;
 336     }
 337
 338     Refresh(false);
 339 }
 340
 341 void TestGLCanvas::OnMouseEvent(wxMouseEvent& event)
 342 {
 343     static int dragging = 0;
 344     static float last_x, last_y;
 345
 346     // Allow default processing to happen, or else the canvas cannot gain focus
 347     // (for key events).
 348     event.Skip();
 349
 350     if (event.LeftIsDown())
 351     {
 352         if (!dragging)
 353         {
 354             dragging = 1;
 355         }
 356         else
 357         {
 358             m_yrot += (event.GetX() - last_x)*1.0;
 359             m_xrot += (event.GetY() - last_y)*1.0;
 360             Refresh(false);
 361         }
 362         last_x = event.GetX();
 363         last_y = event.GetY();
 364     }
 365     else
 366     {
 367         dragging = 0;
 368     }
 369 }
 370
 371 void TestGLCanvas::InitMaterials()
 372 {
 373     static const GLfloat ambient[4] = {0.1f, 0.1f, 0.1f, 1.0f};
 374     static const GLfloat diffuse[4] = {0.5f, 1.0f, 1.0f, 1.0f};
 375     static const GLfloat position0[4] = {0.0f, 0.0f, 20.0f, 0.0f};
 376     static const GLfloat position1[4] = {0.0f, 0.0f, -20.0f, 0.0f};
 377     static const GLfloat front_mat_shininess[1] = {60.0f};
 378     static const GLfloat front_mat_specular[4] = {0.2f, 0.2f, 0.2f, 1.0f};
 379     static const GLfloat front_mat_diffuse[4] = {0.5f, 0.28f, 0.38f, 1.0f};
 380     /*
 381     static const GLfloat back_mat_shininess[1] = {60.0f};
 382     static const GLfloat back_mat_specular[4] = {0.5f, 0.5f, 0.2f, 1.0f};
 383     static const GLfloat back_mat_diffuse[4] = {1.0f, 1.0f, 0.2f, 1.0f};
 384     */
 385     static const GLfloat lmodel_ambient[4] = {1.0f, 1.0f, 1.0f, 1.0f};
 386     static const GLfloat lmodel_twoside[1] = {GL_FALSE};
 387
 388     glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
 389     glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
 390     glLightfv(GL_LIGHT0, GL_POSITION, position0);
 391     glEnable(GL_LIGHT0);
 392
 393     glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
 394     glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
 395     glLightfv(GL_LIGHT1, GL_POSITION, position1);
 396     glEnable(GL_LIGHT1);
 397
 398     glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
 399     glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
 400     glEnable(GL_LIGHTING);
 401
 402     glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
 403     glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
 404     glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);
 405 }
 406
 407 void TestGLCanvas::InitGL()
 408 {
 409     glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 410
 411     glShadeModel(GL_SMOOTH);
 412     glEnable(GL_DEPTH_TEST);
 413
 414     InitMaterials();
 415
 416     glMatrixMode(GL_PROJECTION);
 417     glLoadIdentity();
 418     glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
 419
 420     glMatrixMode(GL_MODELVIEW);
 421     glLoadIdentity();
 422     glTranslatef( 0.0, 0.0, -6.0 );
 423
 424     if (g_use_vertex_arrays)
 425     {
 426         glVertexPointer( 3, GL_FLOAT, 0, m_verts );
 427         glNormalPointer( GL_FLOAT, 0, m_norms );
 428         glEnable( GL_VERTEX_ARRAY );
 429         glEnable( GL_NORMAL_ARRAY );
 430     }
 431 }
 432