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