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 #include "wx/timer.h"
  29 #include "wx/glcanvas.h"
  30
  31 #ifdef __WXMAC__
  32 #  ifdef __DARWIN__
  33 #    include <OpenGL/gl.h>
  34 #    include <OpenGL/glu.h>
  35 #  else
  36 #    include <gl.h>
  37 #    include <glu.h>
  38 #  endif
  39 #else
  40 #  include <GL/gl.h>
  41 #  include <GL/glu.h>
  42 #endif
  43
  44 // disabled because this has apparently changed in OpenGL 1.2, so doesn't link
  45 // correctly if this is on...
  46 #ifdef GL_EXT_vertex_array
  47 #undef GL_EXT_vertex_array
  48 #endif
  49
  50 #include "isosurf.h"
  51
  52 // The following part is taken largely unchanged from the original C Version
  53
  54 #include <math.h>
  55
  56 GLboolean speed_test = GL_FALSE;
  57 GLboolean use_vertex_arrays = GL_FALSE;
  58
  59 GLboolean doubleBuffer = GL_TRUE;
  60
  61 GLboolean smooth = GL_TRUE;
  62 GLboolean lighting = GL_TRUE;
  63
  64
  65 #define MAXVERTS 10000
  66
  67 static GLfloat verts[MAXVERTS][3];
  68 static GLfloat norms[MAXVERTS][3];
  69 static GLint numverts;
  70
  71 static GLfloat xrot;
  72 static GLfloat yrot;
  73
  74
  75 static void read_surface( wxChar *filename )
  76 {
  77    FILE *f;
  78
  79    f = wxFopen(filename,_T("r"));
  80    if (!f) {
  81       wxString msg(_T("Couldn't read "));
  82       msg += filename;
  83       wxMessageBox(msg);
  84       return;
  85    }
  86
  87    numverts = 0;
  88    while (!feof(f) && numverts<MAXVERTS) {
  89       fscanf( f, "%f %f %f  %f %f %f",
  90           &verts[numverts][0], &verts[numverts][1], &verts[numverts][2],
  91           &norms[numverts][0], &norms[numverts][1], &norms[numverts][2] );
  92       numverts++;
  93    }
  94    numverts--;
  95
  96    wxPrintf(_T("%d vertices, %d triangles\n"), numverts, numverts-2);
  97    fclose(f);
  98 }
  99
 100
 101 static void draw_surface( void )
 102 {
 103    GLint i;
 104
 105 #ifdef GL_EXT_vertex_array
 106    if (use_vertex_arrays) {
 107       glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
 108    }
 109    else {
 110 #endif
 111       glBegin( GL_TRIANGLE_STRIP );
 112       for (i=0;i<numverts;i++) {
 113          glNormal3fv( norms[i] );
 114          glVertex3fv( verts[i] );
 115       }
 116       glEnd();
 117 #ifdef GL_EXT_vertex_array
 118    }
 119 #endif
 120 }
 121
 122
 123 static void draw1(void)
 124 {
 125     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 126     glPushMatrix();
 127     glRotatef( yrot, 0.0, 1.0, 0.0 );
 128     glRotatef( xrot, 1.0, 0.0, 0.0 );
 129
 130     draw_surface();
 131
 132     glPopMatrix();
 133
 134     glFlush();
 135 }
 136
 137
 138 static void InitMaterials(void)
 139 {
 140     static float ambient[] = {0.1, 0.1, 0.1, 1.0};
 141     static float diffuse[] = {0.5, 1.0, 1.0, 1.0};
 142     static float position0[] = {0.0, 0.0, 20.0, 0.0};
 143     static float position1[] = {0.0, 0.0, -20.0, 0.0};
 144     static float front_mat_shininess[] = {60.0};
 145     static float front_mat_specular[] = {0.2, 0.2, 0.2, 1.0};
 146     static float front_mat_diffuse[] = {0.5, 0.28, 0.38, 1.0};
 147     /*
 148     static float back_mat_shininess[] = {60.0};
 149     static float back_mat_specular[] = {0.5, 0.5, 0.2, 1.0};
 150     static float back_mat_diffuse[] = {1.0, 1.0, 0.2, 1.0};
 151     */
 152     static float lmodel_ambient[] = {1.0, 1.0, 1.0, 1.0};
 153     static float lmodel_twoside[] = {GL_FALSE};
 154
 155     glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
 156     glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
 157     glLightfv(GL_LIGHT0, GL_POSITION, position0);
 158     glEnable(GL_LIGHT0);
 159
 160     glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
 161     glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
 162     glLightfv(GL_LIGHT1, GL_POSITION, position1);
 163     glEnable(GL_LIGHT1);
 164
 165     glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
 166     glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
 167     glEnable(GL_LIGHTING);
 168
 169     glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
 170     glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
 171     glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);
 172 }
 173
 174
 175 static void Init(void)
 176 {
 177    glClearColor(0.0, 0.0, 0.0, 0.0);
 178
 179    glShadeModel(GL_SMOOTH);
 180    glEnable(GL_DEPTH_TEST);
 181
 182    InitMaterials();
 183
 184    glMatrixMode(GL_PROJECTION);
 185    glLoadIdentity();
 186    glFrustum( -1.0, 1.0, -1.0, 1.0, 5, 25 );
 187
 188    glMatrixMode(GL_MODELVIEW);
 189    glLoadIdentity();
 190    glTranslatef( 0.0, 0.0, -6.0 );
 191
 192 #ifdef GL_EXT_vertex_array
 193    if (use_vertex_arrays) {
 194       glVertexPointerEXT( 3, GL_FLOAT, 0, numverts, verts );
 195       glNormalPointerEXT( GL_FLOAT, 0, numverts, norms );
 196       glEnable( GL_VERTEX_ARRAY_EXT );
 197       glEnable( GL_NORMAL_ARRAY_EXT );
 198    }
 199 #endif
 200 }
 201
 202 static GLenum Args(int argc, wxChar **argv)
 203 {
 204    GLint i;
 205
 206    for (i = 1; i < argc; i++) {
 207       if (wxStrcmp(argv[i], _T("-sb")) == 0) {
 208          doubleBuffer = GL_FALSE;
 209       }
 210       else if (wxStrcmp(argv[i], _T("-db")) == 0) {
 211          doubleBuffer = GL_TRUE;
 212       }
 213       else if (wxStrcmp(argv[i], _T("-speed")) == 0) {
 214          speed_test = GL_TRUE;
 215          doubleBuffer = GL_TRUE;
 216       }
 217       else if (wxStrcmp(argv[i], _T("-va")) == 0) {
 218          use_vertex_arrays = GL_TRUE;
 219       }
 220       else {
 221          wxString msg(_T("Bad option: "));
 222          msg += argv[i];
 223          wxMessageBox(msg);
 224          return GL_FALSE;
 225       }
 226    }
 227
 228    return GL_TRUE;
 229 }
 230
 231 // The following part was written for wxWindows 1.66
 232 MyFrame *frame = NULL;
 233
 234 IMPLEMENT_APP(MyApp)
 235
 236 // `Main program' equivalent, creating windows and returning main app frame
 237 bool MyApp::OnInit(void)
 238 {
 239   Args(argc, argv);
 240
 241   // Create the main frame window
 242   frame = new MyFrame(NULL, _T("Isosurf GL Sample"), wxPoint(50, 50), wxSize(200, 200));
 243
 244   // Give it an icon
 245   frame->SetIcon(wxIcon(_T("mondrian")));
 246
 247   // Make a menubar
 248   wxMenu *fileMenu = new wxMenu;
 249
 250   fileMenu->Append(wxID_EXIT, _T("E&xit"));
 251   wxMenuBar *menuBar = new wxMenuBar;
 252   menuBar->Append(fileMenu, _T("&File"));
 253   frame->SetMenuBar(menuBar);
 254
 255   // Make a TestGLCanvas
 256
 257   // JACS
 258 #ifdef __WXMSW__
 259   int *gl_attrib = NULL;
 260 #else
 261   int gl_attrib[20] = { WX_GL_RGBA, WX_GL_MIN_RED, 1, WX_GL_MIN_GREEN, 1,
 262             WX_GL_MIN_BLUE, 1, WX_GL_DEPTH_SIZE, 1,
 263             WX_GL_DOUBLEBUFFER,
 264 #  ifdef __WXMAC__
 265             GL_NONE };
 266 #  else
 267             None };
 268 #  endif
 269 #endif
 270
 271   if(!doubleBuffer)
 272    {
 273       printf("don't have double buffer, disabling\n");
 274 #ifdef __WXGTK__
 275       gl_attrib[9] = None;
 276 #endif
 277       doubleBuffer = GL_FALSE;
 278   }
 279
 280 #if wxUSE_GLCANVAS
 281
 282   frame->m_canvas = new TestGLCanvas(frame, -1, wxDefaultPosition, wxDefaultSize,
 283                                      0, _T("TestGLCanvas"), gl_attrib );
 284
 285   // Show the frame
 286   frame->Show(TRUE);
 287
 288   frame->m_canvas->SetCurrent();
 289   read_surface( _T("isosurf.dat") );
 290
 291   Init();
 292
 293   return TRUE;
 294
 295 #else
 296
 297   wxMessageBox( _T("This sample has to be compiled with wxUSE_GLCANVAS"), _T("Building error"), wxOK);
 298
 299   return FALSE;
 300 #endif
 301 }
 302
 303 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 304     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 305 END_EVENT_TABLE()
 306
 307 // My frame constructor
 308 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
 309     const wxSize& size, long style):
 310   wxFrame(frame, -1, title, pos, size, style)
 311 {
 312 #if wxUSE_GLCANVAS
 313     m_canvas = NULL;
 314 #endif
 315 }
 316
 317 // Intercept menu commands
 318 void MyFrame::OnExit(wxCommandEvent& WXUNUSED(event))
 319 {
 320     Destroy();
 321 }
 322
 323 /*
 324  * TestGLCanvas implementation
 325  */
 326
 327 #if wxUSE_GLCANVAS
 328
 329 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
 330     EVT_SIZE(TestGLCanvas::OnSize)
 331     EVT_PAINT(TestGLCanvas::OnPaint)
 332     EVT_CHAR(TestGLCanvas::OnChar)
 333     EVT_MOUSE_EVENTS(TestGLCanvas::OnMouseEvent)
 334     EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
 335 END_EVENT_TABLE()
 336
 337 TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
 338     const wxPoint& pos, const wxSize& size, long style, const wxString& name, int* gl_attrib):
 339   wxGLCanvas(parent, id, pos, size, style, name, gl_attrib)
 340 {
 341    parent->Show(TRUE);
 342    SetCurrent();
 343
 344    /* Make sure server supports the vertex array extension */
 345    char* extensions = (char *) glGetString( GL_EXTENSIONS );
 346    if (!extensions || !strstr( extensions, "GL_EXT_vertex_array" )) {
 347       use_vertex_arrays = GL_FALSE;
 348    }
 349 }
 350
 351
 352 TestGLCanvas::~TestGLCanvas(void)
 353 {
 354 }
 355
 356 void TestGLCanvas::OnPaint( wxPaintEvent& WXUNUSED(event) )
 357 {
 358     // This is a dummy, to avoid an endless succession of paint messages.
 359     // OnPaint handlers must always create a wxPaintDC.
 360     wxPaintDC dc(this);
 361
 362 #ifndef __WXMOTIF__
 363     if (!GetContext()) return;
 364 #endif
 365
 366     SetCurrent();
 367
 368     draw1();
 369     SwapBuffers();
 370 }
 371
 372 void TestGLCanvas::OnSize(wxSizeEvent& event)
 373 {
 374     // this is also necessary to update the context on some platforms
 375     wxGLCanvas::OnSize(event);
 376
 377     // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
 378     int w, h;
 379     GetClientSize(&w, &h);
 380 #ifndef __WXMOTIF__
 381     if (GetContext())
 382 #endif
 383     {
 384         SetCurrent();
 385         glViewport(0, 0, (GLint) w, (GLint) h);
 386     }
 387 }
 388
 389 void TestGLCanvas::OnChar(wxKeyEvent& event)
 390 {
 391     switch(event.GetKeyCode()) {
 392     case WXK_ESCAPE:
 393     exit(0);
 394     case WXK_LEFT:
 395     yrot -= 15.0;
 396     break;
 397     case WXK_RIGHT:
 398     yrot += 15.0;
 399     break;
 400     case WXK_UP:
 401     xrot += 15.0;
 402     break;
 403     case WXK_DOWN:
 404     xrot -= 15.0;
 405     break;
 406     case 's': case 'S':
 407     smooth = !smooth;
 408     if (smooth) {
 409         glShadeModel(GL_SMOOTH);
 410     } else {
 411         glShadeModel(GL_FLAT);
 412     }
 413     break;
 414     case 'l': case 'L':
 415     lighting = !lighting;
 416     if (lighting) {
 417         glEnable(GL_LIGHTING);
 418     } else {
 419         glDisable(GL_LIGHTING);
 420     }
 421     break;
 422      default:
 423       {
 424         event.Skip();
 425     return;
 426       }
 427     }
 428
 429     Refresh(FALSE);
 430 }
 431
 432 void TestGLCanvas::OnMouseEvent(wxMouseEvent& event)
 433 {
 434     static int dragging = 0;
 435     static float last_x, last_y;
 436
 437     //printf("%f %f %d\n", event.GetX(), event.GetY(), (int)event.LeftIsDown());
 438     if(event.LeftIsDown()) {
 439     if(!dragging) {
 440         dragging = 1;
 441     } else {
 442         yrot += (event.GetX() - last_x)*1.0;
 443         xrot += (event.GetY() - last_y)*1.0;
 444         Refresh(FALSE);
 445     }
 446     last_x = event.GetX();
 447     last_y = event.GetY();
 448     } else
 449     dragging = 0;
 450 }
 451
 452 void TestGLCanvas::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 453 {
 454     // Do nothing, to avoid flashing.
 455 }
 456
 457 #endif