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
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   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 "wx/timer.h"
  33 #include "wx/glcanvas.h"
  34 #include "wx/math.h"
  35
  36 #if defined(__WXMAC__) || defined(__WXCOCOA__)
  37 #   ifdef __DARWIN__
  38 #       include <OpenGL/gl.h>
  39 #       include <OpenGL/glu.h>
  40 #   else
  41 #       include <gl.h>
  42 #       include <glu.h>
  43 #   endif
  44 #else
  45 #   include <GL/gl.h>
  46 #   include <GL/glu.h>
  47 #endif
  48
  49 // disabled because this has apparently changed in OpenGL 1.2, so doesn't link
  50 // correctly if this is on...
  51 #ifdef GL_EXT_vertex_array
  52 #undef GL_EXT_vertex_array
  53 #endif
  54
  55 #include "isosurf.h"
  56
  57 // The following part is taken largely unchanged from the original C Version
  58
  59 GLboolean speed_test = GL_FALSE;
  60 GLboolean use_vertex_arrays = GL_FALSE;
  61
  62 GLboolean doubleBuffer = GL_TRUE;
  63
  64 GLboolean smooth = GL_TRUE;
  65 GLboolean lighting = GL_TRUE;
  66
  67
  68 #define MAXVERTS 10000
  69
  70 static GLfloat verts[MAXVERTS][3];
  71 static GLfloat norms[MAXVERTS][3];
  72 static GLint numverts;
  73
  74 static GLfloat xrot;
  75 static GLfloat yrot;
  76
  77
  78 static void read_surface( const wxChar *filename )
  79 {
  80     FILE *f = wxFopen(wxFNCONV(filename),_T("r"));
  81     if (!f)
  82     {
  83         wxString msg = _T("Couldn't read ");
  84         msg += filename;
  85         wxMessageBox(msg);
  86         return;
  87     }
  88
  89     numverts = 0;
  90     while (!feof(f) && numverts<MAXVERTS)
  91     {
  92         fscanf( f, "%f %f %f  %f %f %f",
  93             &verts[numverts][0], &verts[numverts][1], &verts[numverts][2],
  94             &norms[numverts][0], &norms[numverts][1], &norms[numverts][2] );
  95         numverts++;
  96     }
  97
  98     numverts--;
  99
 100     wxPrintf(_T("%d vertices, %d triangles\n"), numverts, numverts-2);
 101
 102     fclose(f);
 103 }
 104
 105
 106 static void draw_surface()
 107 {
 108     GLint i;
 109
 110 #ifdef GL_EXT_vertex_array
 111     if (use_vertex_arrays)
 112     {
 113         glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
 114     }
 115     else
 116 #endif
 117     {
 118         glBegin( GL_TRIANGLE_STRIP );
 119         for (i=0;i<numverts;i++)
 120         {
 121             glNormal3fv( norms[i] );
 122             glVertex3fv( verts[i] );
 123         }
 124         glEnd();
 125     }
 126 }
 127
 128
 129 static void draw1()
 130 {
 131     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 132     glPushMatrix();
 133     glRotatef( yrot, 0.0f, 1.0f, 0.0f );
 134     glRotatef( xrot, 1.0f, 0.0f, 0.0f );
 135
 136     draw_surface();
 137
 138     glPopMatrix();
 139
 140     glFlush();
 141 }
 142
 143
 144 static void InitMaterials()
 145 {
 146     static const GLfloat ambient[4] = {0.1f, 0.1f, 0.1f, 1.0f};
 147     static const GLfloat diffuse[4] = {0.5f, 1.0f, 1.0f, 1.0f};
 148     static const GLfloat position0[4] = {0.0f, 0.0f, 20.0f, 0.0f};
 149     static const GLfloat position1[4] = {0.0f, 0.0f, -20.0f, 0.0f};
 150     static const GLfloat front_mat_shininess[1] = {60.0f};
 151     static const GLfloat front_mat_specular[4] = {0.2f, 0.2f, 0.2f, 1.0f};
 152     static const GLfloat front_mat_diffuse[4] = {0.5f, 0.28f, 0.38f, 1.0f};
 153     /*
 154     static const GLfloat back_mat_shininess[1] = {60.0f};
 155     static const GLfloat back_mat_specular[4] = {0.5f, 0.5f, 0.2f, 1.0f};
 156     static const GLfloat back_mat_diffuse[4] = {1.0f, 1.0f, 0.2f, 1.0f};
 157     */
 158     static const GLfloat lmodel_ambient[4] = {1.0f, 1.0f, 1.0f, 1.0f};
 159     static const GLfloat lmodel_twoside[1] = {GL_FALSE};
 160
 161     glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
 162     glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
 163     glLightfv(GL_LIGHT0, GL_POSITION, position0);
 164     glEnable(GL_LIGHT0);
 165
 166     glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
 167     glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
 168     glLightfv(GL_LIGHT1, GL_POSITION, position1);
 169     glEnable(GL_LIGHT1);
 170
 171     glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
 172     glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
 173     glEnable(GL_LIGHTING);
 174
 175     glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
 176     glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
 177     glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);
 178 }
 179
 180
 181 static void Init(void)
 182 {
 183     glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 184
 185     glShadeModel(GL_SMOOTH);
 186     glEnable(GL_DEPTH_TEST);
 187
 188     InitMaterials();
 189
 190     glMatrixMode(GL_PROJECTION);
 191     glLoadIdentity();
 192     glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
 193
 194     glMatrixMode(GL_MODELVIEW);
 195     glLoadIdentity();
 196     glTranslatef( 0.0, 0.0, -6.0 );
 197
 198 #ifdef GL_EXT_vertex_array
 199     if (use_vertex_arrays)
 200     {
 201         glVertexPointerEXT( 3, GL_FLOAT, 0, numverts, verts );
 202         glNormalPointerEXT( GL_FLOAT, 0, numverts, norms );
 203         glEnable( GL_VERTEX_ARRAY_EXT );
 204         glEnable( GL_NORMAL_ARRAY_EXT );
 205     }
 206 #endif
 207 }
 208
 209 static GLenum Args(int argc, wxChar **argv)
 210 {
 211     GLint i;
 212
 213     for (i = 1; i < argc; i++)
 214     {
 215         if (wxStrcmp(argv[i], _T("-sb")) == 0)
 216         {
 217             doubleBuffer = GL_FALSE;
 218         }
 219         else if (wxStrcmp(argv[i], _T("-db")) == 0)
 220         {
 221             doubleBuffer = GL_TRUE;
 222         }
 223         else if (wxStrcmp(argv[i], _T("-speed")) == 0)
 224         {
 225             speed_test = GL_TRUE;
 226             doubleBuffer = GL_TRUE;
 227         }
 228         else if (wxStrcmp(argv[i], _T("-va")) == 0)
 229         {
 230             use_vertex_arrays = GL_TRUE;
 231         }
 232         else
 233         {
 234             wxString msg = _T("Bad option: ");
 235             msg += argv[i];
 236             wxMessageBox(msg);
 237             return GL_FALSE;
 238         }
 239     }
 240
 241     return GL_TRUE;
 242 }
 243
 244 // The following part was written for wxWidgets 1.66
 245 MyFrame *frame = NULL;
 246
 247 IMPLEMENT_APP(MyApp)
 248
 249 // `Main program' equivalent, creating windows and returning main app frame
 250 bool MyApp::OnInit()
 251 {
 252     Args(argc, argv);
 253
 254     // Create the main frame window
 255     frame = new MyFrame(NULL, wxT("wxWidgets OpenGL Isosurf Sample"),
 256         wxDefaultPosition, wxDefaultSize);
 257
 258     // Give it an icon
 259     frame->SetIcon(wxIcon(_T("mondrian")));
 260
 261     // Make a menubar
 262     wxMenu *fileMenu = new wxMenu;
 263
 264     fileMenu->Append(wxID_EXIT, _T("E&xit"));
 265     wxMenuBar *menuBar = new wxMenuBar;
 266     menuBar->Append(fileMenu, _T("&File"));
 267     frame->SetMenuBar(menuBar);
 268
 269   // Make a TestGLCanvas
 270
 271   // JACS
 272 #ifdef __WXMSW__
 273     int *gl_attrib = NULL;
 274 #else
 275     int gl_attrib[20] = { WX_GL_RGBA, WX_GL_MIN_RED, 1, WX_GL_MIN_GREEN, 1,
 276         WX_GL_MIN_BLUE, 1, WX_GL_DEPTH_SIZE, 1,
 277         WX_GL_DOUBLEBUFFER,
 278 #  ifdef __WXMAC__
 279         GL_NONE };
 280 #  else
 281         None };
 282 #  endif
 283 #endif
 284
 285     if(!doubleBuffer)
 286     {
 287         printf("don't have double buffer, disabling\n");
 288 #ifdef __WXGTK__
 289         gl_attrib[9] = None;
 290 #endif
 291         doubleBuffer = GL_FALSE;
 292     }
 293
 294     frame->m_canvas = new TestGLCanvas(frame, wxID_ANY, wxDefaultPosition,
 295         wxDefaultSize, 0, _T("TestGLCanvas"), gl_attrib );
 296
 297   // Show the frame
 298     frame->Show(true);
 299
 300     frame->m_canvas->SetCurrent();
 301     read_surface( _T("isosurf.dat") );
 302
 303     Init();
 304
 305     return true;
 306 }
 307
 308 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 309     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 310 END_EVENT_TABLE()
 311
 312 // My frame constructor
 313 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
 314     const wxSize& size, long style)
 315     : wxFrame(frame, wxID_ANY, title, pos, size, style)
 316 {
 317     m_canvas = NULL;
 318 }
 319
 320 MyFrame::~MyFrame()
 321 {
 322     delete m_canvas;
 323 }
 324
 325 // Intercept menu commands
 326 void MyFrame::OnExit( wxCommandEvent& WXUNUSED(event) )
 327 {
 328     // true is to force the frame to close
 329     Close(true);
 330 }
 331
 332 /*
 333  * TestGLCanvas implementation
 334  */
 335
 336 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
 337     EVT_SIZE(TestGLCanvas::OnSize)
 338     EVT_PAINT(TestGLCanvas::OnPaint)
 339     EVT_CHAR(TestGLCanvas::OnChar)
 340     EVT_MOUSE_EVENTS(TestGLCanvas::OnMouseEvent)
 341     EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
 342 END_EVENT_TABLE()
 343
 344 TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
 345     const wxPoint& pos, const wxSize& size, long style,
 346     const wxString& name, int* gl_attrib)
 347     : wxGLCanvas(parent, id, pos, size, style, name, gl_attrib)
 348 {
 349     parent->Show(true);
 350     SetCurrent();
 351
 352     /* Make sure server supports the vertex array extension */
 353     char* extensions = (char *) glGetString( GL_EXTENSIONS );
 354     if (!extensions || !strstr( extensions, "GL_EXT_vertex_array" ))
 355     {
 356         use_vertex_arrays = GL_FALSE;
 357     }
 358 }
 359
 360
 361 void TestGLCanvas::OnPaint( wxPaintEvent& WXUNUSED(event) )
 362 {
 363     // This is a dummy, to avoid an endless succession of paint messages.
 364     // OnPaint handlers must always create a wxPaintDC.
 365     wxPaintDC dc(this);
 366
 367 #ifndef __WXMOTIF__
 368     if (!GetContext()) return;
 369 #endif
 370
 371     SetCurrent();
 372
 373     draw1();
 374     SwapBuffers();
 375 }
 376
 377 void TestGLCanvas::OnSize(wxSizeEvent& event)
 378 {
 379     // this is also necessary to update the context on some platforms
 380     wxGLCanvas::OnSize(event);
 381
 382     // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
 383     int w, h;
 384     GetClientSize(&w, &h);
 385 #ifndef __WXMOTIF__
 386     if (GetContext())
 387 #endif
 388     {
 389         SetCurrent();
 390         glViewport(0, 0, (GLint) w, (GLint) h);
 391     }
 392 }
 393
 394 void TestGLCanvas::OnChar(wxKeyEvent& event)
 395 {
 396     switch( event.GetKeyCode() )
 397     {
 398     case WXK_ESCAPE:
 399         wxTheApp->ExitMainLoop();
 400         return;
 401
 402     case WXK_LEFT:
 403         yrot -= 15.0;
 404         break;
 405
 406     case WXK_RIGHT:
 407         yrot += 15.0;
 408         break;
 409
 410     case WXK_UP:
 411         xrot += 15.0;
 412         break;
 413
 414     case WXK_DOWN:
 415         xrot -= 15.0;
 416         break;
 417
 418     case 's': case 'S':
 419         smooth = !smooth;
 420         if (smooth)
 421         {
 422             glShadeModel(GL_SMOOTH);
 423         }
 424         else
 425         {
 426             glShadeModel(GL_FLAT);
 427         }
 428         break;
 429
 430     case 'l': case 'L':
 431         lighting = !lighting;
 432         if (lighting)
 433         {
 434             glEnable(GL_LIGHTING);
 435         }
 436         else
 437         {
 438             glDisable(GL_LIGHTING);
 439         }
 440         break;
 441
 442     default:
 443         event.Skip();
 444         return;
 445     }
 446
 447     Refresh(false);
 448 }
 449
 450 void TestGLCanvas::OnMouseEvent(wxMouseEvent& event)
 451 {
 452     static int dragging = 0;
 453     static float last_x, last_y;
 454
 455     //printf("%f %f %d\n", event.GetX(), event.GetY(), (int)event.LeftIsDown());
 456     if(event.LeftIsDown())
 457     {
 458         if(!dragging)
 459         {
 460             dragging = 1;
 461         }
 462         else
 463         {
 464             yrot += (event.GetX() - last_x)*1.0;
 465             xrot += (event.GetY() - last_y)*1.0;
 466             Refresh(false);
 467         }
 468         last_x = event.GetX();
 469         last_y = event.GetY();
 470     }
 471     else
 472         dragging = 0;
 473
 474 }
 475
 476 void TestGLCanvas::OnEraseBackground( wxEraseEvent& WXUNUSED(event) )
 477 {
 478     // Do nothing, to avoid flashing.
 479 }
 480