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