source: tags/Visualization_after-vis09-02-01-tag/OpenGL/src/G4OpenGLXViewer.cc @ 1358

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5// * The  Geant4 software  is  copyright of the Copyright Holders  of *
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25//
26//
27// $Id: G4OpenGLXViewer.cc,v 1.51 2009/03/05 16:36:13 lgarnier Exp $
28// GEANT4 tag $Name:  $
29//
30//
31// Andrew Walkden  7th February 1997
32// G4OpenGLXViewer : Class to provide XWindows specific
33//                 functionality for OpenGL in GEANT4
34
35#ifdef G4VIS_BUILD_OPENGLX_DRIVER
36
37#include "G4OpenGLXViewer.hh"
38#include "G4VViewer.hh"
39#include "G4OpenGLSceneHandler.hh"
40#include <GL/glu.h>
41
42#include "G4OpenGLFontBaseStore.hh"
43
44#include <sstream>
45
46#include "G4VisExtent.hh"
47#include "G4LogicalVolume.hh"
48#include "G4VSolid.hh"
49#include "G4Point3D.hh"
50#include "G4Normal3D.hh"
51#include "G4StateManager.hh"
52
53#include <X11/Xatom.h>
54#include <X11/Xutil.h>
55#include <X11/Xmu/StdCmap.h>
56
57#include <assert.h>
58
59int G4OpenGLXViewer::snglBuf_RGBA[12] =
60{ GLX_RGBA,
61  GLX_RED_SIZE, 1,
62  GLX_GREEN_SIZE, 1,
63  GLX_BLUE_SIZE, 1,
64  GLX_DEPTH_SIZE, 1,
65  GLX_STENCIL_SIZE, 1,
66  None };
67
68int G4OpenGLXViewer::dblBuf_RGBA[13] =
69{ GLX_RGBA,
70  GLX_RED_SIZE, 1,
71  GLX_GREEN_SIZE, 1,
72  GLX_BLUE_SIZE, 1,
73  GLX_DOUBLEBUFFER,
74  GLX_DEPTH_SIZE, 1,
75  GLX_STENCIL_SIZE, 1,
76  None };
77
78#define NewString(str) \
79 ((str) != NULL ? (strcpy((char*)malloc((unsigned)strlen(str) + 1), str)) : (char*)NULL)
80
81#define USE_DEFAULT_COLORMAP 1
82#define USE_STANDARD_COLORMAP 0
83
84XVisualInfo*  G4OpenGLXViewer::vi_single_buffer = 0;
85XVisualInfo*  G4OpenGLXViewer::vi_double_buffer = 0;
86
87extern "C" {
88  static Bool G4OpenGLXViewerWaitForNotify (Display*, XEvent* e, char* arg) {
89    return (e->type == MapNotify) && (e->xmap.window == (Window) arg);
90  }
91}
92
93void G4OpenGLXViewer::SetView () {
94  glXMakeCurrent (dpy, fGLXWin, cx);
95  G4OpenGLViewer::SetView (); 
96}
97
98void G4OpenGLXViewer::ShowView () {
99  glXWaitGL (); //Wait for effects of all previous OpenGL commands to
100                //be propagated before progressing.
101  glFlush ();
102
103  if (fVP.IsPicking()) {
104    G4cout <<
105      "Window activated for picking (left-mouse), exit (middle-mouse)."
106           << G4endl;
107    while (true) {
108      if (XPending(dpy)) {
109        XNextEvent(dpy, &event);
110        if (event.type == ButtonPress && event.xbutton.button == 1) {
111          Pick(event.xbutton.x, event.xbutton.y);
112        }
113        else if (event.type == ButtonPress && event.xbutton.button == 2) break;
114      }
115    }
116  }
117}
118
119void G4OpenGLXViewer::GetXConnection () {
120// get a connection.
121  dpy = XOpenDisplay (0);
122  if (!dpy) {
123    fViewId = -1;  // This flags an error.
124    G4cerr << "G4OpenGLViewer::G4OpenGLViewer couldn't open display." << G4endl;
125    return;
126  }
127
128// make sure OpenGL is supported and installed properly.
129  if (!glXQueryExtension (dpy, &errorBase, &eventBase)) {
130    fViewId = -1;  // This flags an error.
131    G4cerr << "G4OpenGLViewer::G4OpenGLViewer X Server has no GLX extension."
132         << G4endl;
133    return;
134  }
135
136}
137
138void G4OpenGLXViewer::CreateGLXContext (XVisualInfo* v) {
139
140  vi = v;
141// get window's attributes
142  if (!XGetWindowAttributes(dpy, XRootWindow (dpy, vi -> screen), &xwa)) {
143    fViewId = -1;  // This flags an error.
144    G4cerr << "G4OpenGLViewer::G4OpenGLViewer couldn't return window attributes"
145         << G4endl;
146    return;
147  }
148 
149// create a GLX context
150  cx = glXCreateContext (dpy, vi, 0, true);
151  if (!cx) {
152    fViewId = -1;  // This flags an error.
153    G4cerr << "G4OpenGLViewer::G4OpenGLViewer couldn't create context."
154         << G4endl;
155    return;
156  }
157
158// New stab at getting a colormap
159
160  Status status;
161  XStandardColormap *standardCmaps = XAllocStandardColormap ();
162  int i, numCmaps;
163
164  status = XmuLookupStandardColormap (dpy,
165                                      vi -> screen,
166                                      vi -> visualid,
167                                      vi -> depth,
168                                      XA_RGB_DEFAULT_MAP,
169                                      False,
170                                      True);
171 
172  if (status == 1) {
173    cmap = 0;
174    status = XGetRGBColormaps (dpy,
175                               XRootWindow (dpy, vi -> screen),
176                               &standardCmaps,
177                               &numCmaps,
178                               XA_RGB_DEFAULT_MAP);
179    if (status == 1)
180      for (i = 0; i < numCmaps; i++) {
181        if (standardCmaps[i].visualid == vi -> visualid) {
182          cmap = standardCmaps[i].colormap;
183          XFree (standardCmaps);
184          break;
185        }
186      }
187    if (!cmap) {
188      fViewId = -1;  // This flags an error.
189      G4cerr <<
190   "G4OpenGLViewer::G4OpenGLViewer failed to allocate a standard colormap."
191             << G4endl;
192      return;
193    }
194    G4cout << "Got standard cmap" << G4endl;
195  } else {
196    cmap = XCreateColormap (dpy,
197                            XRootWindow(dpy, vi -> screen),
198                            vi -> visual,
199                            AllocNone);
200    G4cout << "Created own cmap" << G4endl;
201  }
202
203  if (!cmap) {
204    fViewId = -1;  // This flags an error.
205    G4cerr << "G4OpenGLViewer::G4OpenGLViewer failed to allocate a Colormap."
206         << G4endl;
207    return;
208  }
209
210}
211 
212void G4OpenGLXViewer::CreateMainWindow () {
213 
214// create a window
215  swa.colormap = cmap;
216  swa.border_pixel = 0;
217  swa.event_mask = ExposureMask | ButtonPressMask | StructureNotifyMask;
218  swa.backing_store = WhenMapped;
219
220  // Window size and position...
221  size_hints = XAllocSizeHints();
222   
223  fWinSize_x = fVP.GetWindowSizeHintX();
224  fWinSize_y = fVP.GetWindowSizeHintY();
225  G4int x_origin = fVP.GetWindowAbsoluteLocationHintX(DisplayWidth(dpy, vi -> screen));
226
227  // FIXME,  screen size != window size on MAC, but I don't know have to get the menuBar
228  // size on MAC. L.Garnier 01/2009
229  G4int y_origin = fVP.GetWindowAbsoluteLocationHintY(DisplayHeight(dpy, vi -> screen));
230
231  size_hints->base_width = fWinSize_x;
232  size_hints->base_height = fWinSize_y;
233  size_hints->x = x_origin;
234  size_hints->y = y_origin;
235  if (fVP.IsWindowSizeHintX () && fVP.IsWindowLocationHintX () && fVP.IsWindowLocationHintY ()) {
236    size_hints->flags |= PSize | PPosition;
237  } else if (fVP.IsWindowSizeHintX () && !(fVP.IsWindowLocationHintX () || fVP.IsWindowLocationHintY ())) {
238    size_hints->flags |= PSize;
239  } else if ((!fVP.IsWindowSizeHintX ()) && fVP.IsWindowLocationHintX () && fVP.IsWindowLocationHintY ()) {
240    size_hints->flags |= PPosition;
241  }
242  G4cout << "Window name: " << fName << G4endl;
243  strncpy (charViewName, fName, 100);
244  char *window_name = charViewName;
245  char *icon_name = charViewName;
246  //char tmpatom[] = "XA_WM_NORMAL_HINTS";
247  wm_hints = XAllocWMHints();
248  class_hints = XAllocClassHint();
249
250  XStringListToTextProperty (&window_name, 1, &windowName);
251  XStringListToTextProperty (&icon_name, 1, &iconName);
252
253  wm_hints -> initial_state = NormalState;
254  wm_hints -> input = True;
255  wm_hints -> icon_pixmap = icon_pixmap;
256  wm_hints -> flags = StateHint | IconPixmapHint | InputHint;
257
258  class_hints -> res_name  = NewString("G4OpenGL");
259  class_hints -> res_class = NewString("G4OpenGL");
260
261   fGLXWin = XCreateWindow (dpy, XRootWindow (dpy, vi -> screen), x_origin,
262                        y_origin, fWinSize_x, fWinSize_y, 0, vi -> depth,
263                        InputOutput, vi -> visual, 
264                        CWBorderPixel | CWColormap |
265                        CWEventMask | CWBackingStore,
266                        &swa);
267 
268   XSetWMProperties (dpy, fGLXWin, &windowName, &iconName, 0, 0,
269                     size_hints, wm_hints, class_hints);
270 
271// request X to Draw window on screen.
272  XMapWindow (dpy, fGLXWin);
273
274// Wait for window to appear (wait for an "expose" event).
275  XIfEvent (dpy, &event, G4OpenGLXViewerWaitForNotify, (char*) fGLXWin);
276
277// connect the context to a window
278  Bool success = glXMakeCurrent (dpy, fGLXWin, cx);
279  if (!success) {
280    fViewId = -1;  // This flags an error.
281    G4cerr << "G4OpenGLViewer::G4OpenGLViewer failed to attach a GLX context."
282         << G4endl;
283    GLint error = GL_NO_ERROR;
284    while ((error = glGetError()) != GL_NO_ERROR) {
285      G4cout << "GL Error: " << gluErrorString(error) << G4endl;
286    }
287    return;
288  }
289
290}
291
292void G4OpenGLXViewer::CreateFontLists () {
293
294  std::map<G4double,G4String> fonts;  // G4VMarker screen size and font name.
295  fonts[10.] = "-adobe-courier-bold-r-normal--10-100-75-75-m-60-iso8859-1";
296  fonts[11.] = "-adobe-courier-bold-r-normal--11-80-100-100-m-60-iso8859-1";
297  fonts[12.] = "-adobe-courier-bold-r-normal--12-120-75-75-m-70-iso8859-1";
298  fonts[13.] = "fixed";
299  fonts[14.] = "-adobe-courier-bold-r-normal--14-100-100-100-m-90-iso8859-1";
300  fonts[17.] = "-adobe-courier-bold-r-normal--17-120-100-100-m-100-iso8859-1";
301  fonts[18.] = "-adobe-courier-bold-r-normal--18-180-75-75-m-110-iso8859-1";
302  fonts[20.] = "-adobe-courier-bold-r-normal--20-140-100-100-m-110-iso8859-1";
303  fonts[24.] = "-adobe-courier-bold-r-normal--24-240-75-75-m-150-iso8859-1";
304  fonts[25.] = "-adobe-courier-bold-r-normal--25-180-100-100-m-150-iso8859-1";
305  fonts[34.] = "-adobe-courier-bold-r-normal--34-240-100-100-m-200-iso8859-1";
306  std::map<G4double,G4String>::const_iterator i;
307  for (i = fonts.begin(); i != fonts.end(); ++i) {
308    XFontStruct* font_info = XLoadQueryFont(dpy, i->second);
309    if (!font_info) {
310      G4cerr <<
311        "G4OpenGLXViewer: XLoadQueryFont failed for font\n  "
312             << i->second
313             << G4endl;
314      continue;
315    }
316    G4int font_base = glGenLists(256);
317    if (!font_base) {
318      G4cerr << "G4OpenGLXViewer: out of display lists for fonts."
319             << G4endl;
320      continue;
321    }
322    G4int first = font_info->min_char_or_byte2;
323    G4int last  = font_info->max_char_or_byte2;
324    glXUseXFont(font_info->fid, first, last-first+1,font_base+first);
325    G4OpenGLFontBaseStore::AddFontBase(this,font_base,i->first,i->second);
326  }
327}
328
329G4OpenGLXViewer::G4OpenGLXViewer (G4OpenGLSceneHandler& scene):
330G4VViewer (scene, -1),
331G4OpenGLViewer (scene),
332vi_immediate (0),
333vi_stored (0),
334vi (0),
335cmap (0)
336{
337  GetXConnection ();
338  if (fViewId < 0) return;
339 
340  // Try for a visual suitable for OpenGLImmediate..
341  // first try for a single buffered RGB window
342  if (!vi_single_buffer) {
343    vi_single_buffer =
344      glXChooseVisual (dpy, XDefaultScreen (dpy), snglBuf_RGBA);
345  }
346  if (!vi_double_buffer) {
347    vi_double_buffer =
348      glXChooseVisual (dpy, XDefaultScreen (dpy), dblBuf_RGBA);
349  }
350
351  if (vi_single_buffer || vi_double_buffer) {
352    if (!vi_double_buffer) {
353      G4cout <<
354        "G4OpenGLXViewer::G4OpenGLXViewer: unable to get a double buffer visual."
355        "\n  Working with a single buffer."
356             << G4endl;
357    }
358  } else {
359    if (!vi_single_buffer) {
360      G4cout <<
361        "G4OpenGLXViewer::G4OpenGLXViewer: unable to get a single buffer visual."
362             << G4endl;
363    }
364    if (!vi_double_buffer) {
365      G4cout <<
366        "G4OpenGLXViewer::G4OpenGLXViewer: unable to get a double buffer visual."
367             << G4endl;
368    }
369  }
370
371  if (vi_single_buffer) {
372    vi_immediate = vi_single_buffer;
373    attributeList = snglBuf_RGBA;
374  }
375 
376  if (!vi_immediate){
377    // next try for a double buffered RGB, but Draw to top buffer
378    if (vi_double_buffer) {
379      vi_immediate = vi_double_buffer;
380      attributeList = dblBuf_RGBA;
381    }
382  }
383
384  // Now try for a visual suitable for OpenGLStored...
385  // Try for a double buffered RGB window
386  if (vi_double_buffer) {
387    vi_stored = vi_double_buffer;
388    attributeList = dblBuf_RGBA;
389  }
390
391  if (!vi_immediate || !vi_stored) {
392    G4cout <<
393    "G4OpenGLXViewer::G4OpenGLXViewer: unable to get required visuals."
394           << G4endl;
395    fViewId = -1;  // This flags an error.
396  }
397
398  //  glClearColor (0., 0., 0., 0.);
399  //  glClearDepth (1.);
400}
401
402G4OpenGLXViewer::~G4OpenGLXViewer () {
403  if (fViewId >= 0) {
404    //Close a window from here
405    glXMakeCurrent (dpy, None, NULL);
406    glXDestroyContext (dpy, cx);
407    if (fGLXWin) XDestroyWindow (dpy, fGLXWin); // ...if already deleted in
408    // sub-class G4OpenGLXmViewer.
409    XFlush (dpy);
410  }
411}
412
413void G4OpenGLXViewer::printEPS() {
414 
415    printf("G4OpenGLXViewer::print \n");
416
417  //using namespace std;
418  //cout << "print_col_callback requested with file name: " << fPrintFilename << G4endl;
419 
420  if (fVectoredPs) {
421#ifdef G4DEBUG_VIS_OGL
422    printf("G4OpenGLXViewer::print Vectored\n");
423#endif
424    G4OpenGLViewer::printEPS();   
425  } else {
426#ifdef G4DEBUG_VIS_OGL
427    printf("G4OpenGLXViewer::print non Vectored\n");
428#endif
429//     G4StateManager* stateManager = G4StateManager::GetStateManager();
430//     G4ApplicationState oldState = stateManager->GetCurrentState();
431//     stateManager->SetNewState(G4State_Idle); 
432
433//     printEPS ();
434
435//     stateManager->SetNewState(oldState); 
436   
437//     //    fPrintFilename =   fPrintFilename+"-Gl2ps.ps";
438//     return;
439
440// save context before
441    tmp_cx = cx;
442    XVisualInfo* pvi;
443    GLXContext pcx = create_GL_print_context(pvi);
444
445    if (!pcx) {
446      G4cout << "Unable to create print context." << G4endl;
447      return;
448    }
449
450#ifdef G4DEBUG_VIS_OGL
451    printf("G4OpenGLXViewer::print Create pixmap old context:%d new context %d old winGL:%d  Size :%d %d\n",cx,pcx,fGLXWin,fWinSize_x, fWinSize_y);
452#endif
453    cx=pcx;
454   
455    Pixmap pmap = XCreatePixmap (dpy,
456                                 XRootWindow (dpy, pvi->screen),
457                                 fWinSize_x, fWinSize_y,
458                                 pvi->depth);
459   
460
461    if (!pmap) {
462      G4cout << "Unable to create pixmap." << G4endl;
463      return;
464    }
465
466
467    GLXPixmap glxpmap = glXCreateGLXPixmap (dpy,
468                                            pvi,
469                                            pmap);
470   
471    if (!glxpmap) {
472      G4cout << "Unable to create glx pixmap." << G4endl;
473      return;
474    }
475
476
477    GLXDrawable tmp_win;
478    tmp_win=fGLXWin;
479    fGLXWin=glxpmap;
480   
481    int winX=fWinSize_x;
482    int winY=fWinSize_y;
483
484    //#define CHECK_MULTIPLE_PRINT 1
485#ifdef CHECK_MULTIPLE_PRINT
486    for (int tstX  = 3000-2;tstX <=3000+2;tstX++) {
487      for (int tstY  = 3000-2;tstY <=3000+2;tstY++) {
488        fWinSize_y = tstY;
489        fWinSize_x = tstX;
490        std::string file = "G4OpenGL_XPixmap";
491        file += tstX;
492        file +="x";
493        file +=tstY;
494        file +=".eps";
495#else
496        std::string file = "G4OpenGL_XPixmapTest.eps";
497#endif
498
499    // clear the buffers and window.
500    SetView();
501    ClearView ();
502
503#ifdef G4DEBUG_VIS_OGL
504    printf("G4OpenGLXViewer::print Call DrawView context:%d old winGL:%d \n",cx,fGLXWin);
505#endif
506
507
508
509    // Need to force redraw for SXm mode
510    NeedKernelVisit ();
511
512    // Need to change state to IDLE
513    G4StateManager* stateManager = G4StateManager::GetStateManager();
514    G4ApplicationState oldState = stateManager->GetCurrentState();
515    stateManager->SetNewState(G4State_Idle); 
516
517   
518
519    DrawView (); // Will make current glX
520
521    // Restore state
522    stateManager->SetNewState(oldState); 
523
524
525
526   
527    generateEPSX (file.c_str(),
528                 fPrintColour,
529                 fWinSize_x, fWinSize_y);
530   
531#ifdef CHECK_MULTIPLE_PRINT
532      }
533    }
534    fWinSize_y = winY;
535    fWinSize_x = winX;
536#endif
537    fGLXWin=tmp_win;
538    cx=tmp_cx;
539   
540//     bool er2 = glXMakeCurrent (dpy,
541//                  fGLXWin,
542//                  cx);
543    printf("G4OpenGLXViewer::print Restored context:%d old winGL:%d \n",cx,fGLXWin);
544    //    printf("Error 1:%d 2:%d\n",er1,er2);
545   
546    // Free print context
547    XFreePixmap(dpy,pmap);
548    glXDestroyContext(dpy,pcx);
549    glXDestroyGLXPixmap(dpy,glxpmap);
550   
551    // Restore view in display context
552    SetView();
553   
554  }
555
556}
557
558
559GLXContext G4OpenGLXViewer::create_GL_print_context(XVisualInfo*& pvi) {
560 
561  pvi = glXChooseVisual (dpy,
562                         XDefaultScreen (dpy),
563                         snglBuf_RGBA);
564
565  if (!pvi) {
566    pvi = glXChooseVisual (dpy,
567                           XDefaultScreen (dpy),
568                           dblBuf_RGBA);
569  }
570
571//    GLXFBConfig *fbc;
572//    XVisualInfo *vi;
573//    Colormap cmap;
574//    XSetWindowAttributes swa;
575//    Window win;
576//    GLXContext cx;
577//    GLXWindow gwin;
578//    XEvent event;
579//    int nelements;
580 
581//    /* Find a FBConfig that uses RGBA.  Note that no attribute list is */
582//    /* needed since GLX_RGBA_BIT is a default attribute.               */
583//    fbc = glXChooseFBConfig(dpy,XRootWindow (dpy, pvi->screen), 0, &nelements);
584//    vi = glXGetVisualFromFBConfig(dpy, fbc[0]);
585 
586//    /* Create a GLX context using the first FBConfig in the list. */
587//    return  glXCreateNewContext(dpy, fbc[0], GLX_RGBA_TYPE, 0, GL_FALSE);
588 
589
590 
591  printf("------%d------\n",tmp_cx);
592  return glXCreateContext (dpy,
593                           pvi,
594                           0,
595                           False);
596}
597
598
599bool G4OpenGLXViewer::grabPixelsX (unsigned int width, unsigned int height,GLenum format,GLubyte* buffer) {
600#ifdef G4DEBUG_VIS_OGL
601  GLint viewport[4];
602  glGetIntegerv(GL_VIEWPORT, viewport);
603  printf("G4OpenGLXViewer::grabPixelsX %d %d     viewport %d %d %d %d\n",width,height,viewport[0],viewport[1],viewport[2],viewport[3]);
604#endif
605         
606  GLint swapbytes, lsbfirst, rowlength;
607  GLint skiprows, skippixels, alignment;
608
609  unsigned int lineSize = 0;
610  if (format == GL_RGB){
611    lineSize = width*3;
612  } else {
613    lineSize = width*1;
614  }
615 
616  GLubyte* lineBuffer = new GLubyte[lineSize];
617  if (lineBuffer == NULL)
618    return false;
619  for (int y = 0; y<lineSize; y++) {
620    lineBuffer[y] = 0;
621  }
622
623  glGetIntegerv (GL_UNPACK_SWAP_BYTES, &swapbytes);
624  glGetIntegerv (GL_UNPACK_LSB_FIRST, &lsbfirst);
625  glGetIntegerv (GL_UNPACK_ROW_LENGTH, &rowlength);
626       
627  glGetIntegerv (GL_UNPACK_SKIP_ROWS, &skiprows);
628  glGetIntegerv (GL_UNPACK_SKIP_PIXELS, &skippixels);
629  glGetIntegerv (GL_UNPACK_ALIGNMENT, &alignment);
630       
631  glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
632  glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
633  glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
634       
635  glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
636  glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
637  glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
638       
639  // FIXME L.Garnier 25 03 2009
640  // Try to read at first a block of width by height
641  // But on mac osX 10.5.6 on some window size their is
642  // some stranges effects:
643  // Pixels should came 3 values by 3 values but on border
644  // it seems that with some window size there is a lack of
645  // 1 or 2 values. For example a gray level picture like
646  // (1,1,1) (2,2,2) (3,3,3)
647  // (4,4,4) (5,5,5) (6,6,6)
648  // (7,7,7) (8,8,8) (9,9,9)
649  // appear as (with all buffer values init to 999) :
650  // (1,1,1) (2,2,2) (3,3,3)
651  // (999,999,4) (4,4,5) (5,5,6)
652  // (6,6,999) (999,999,7) (7,7,8)
653  // STRANGE EFFECT....
654
655  // Then we read line by line...and NO problem !
656
657
658  for (int i=0;i<height;i++) {
659    glReadPixels (0, i, (GLsizei)width, 1, format, GL_UNSIGNED_BYTE, (GLvoid*) lineBuffer);
660    glXWaitGL (); //Wait for effects of all previous OpenGL commands to
661    //    printf("\n%d ",i);
662    for (int j=0;j<lineSize;j++) {
663      buffer[j+i*lineSize] = lineBuffer[j];
664      //      printf("%d ",buffer[j]);
665    }
666  }
667  //                 //be propagated before progressing.
668#ifdef G4DEBUG_VIS_OGL
669  printf("G4OpenGLXViewer::GrabPixelX flush\n");
670#endif
671  glFlush ();
672
673  delete [] lineBuffer;
674 
675  glPixelStorei (GL_UNPACK_SWAP_BYTES, swapbytes);
676  glPixelStorei (GL_UNPACK_LSB_FIRST, lsbfirst);
677  glPixelStorei (GL_UNPACK_ROW_LENGTH, rowlength);
678         
679  glPixelStorei (GL_UNPACK_SKIP_ROWS, skiprows);
680  glPixelStorei (GL_UNPACK_SKIP_PIXELS, skippixels);
681  glPixelStorei (GL_UNPACK_ALIGNMENT, alignment);
682         
683 
684  return true;
685}
686       
687int G4OpenGLXViewer::generateEPSX (const char* filnam,
688                                  int inColour,
689                                  unsigned int width,
690                                  unsigned int height) {
691       
692  FILE* fp;
693  GLubyte* pixels;
694  GLubyte* curpix;
695  int components, pos, i;
696
697  GLenum format;
698  int size;
699       
700  if (inColour) {
701    format = GL_RGB;
702    size = width*height*3;
703  } else {
704    format = GL_LUMINANCE;
705    size = width*height*1;
706  }
707       
708  pixels = new GLubyte[size];
709  if (pixels == NULL)
710    return NULL;
711  for (int y = 0; y<size; y++) {
712    pixels[y] = 0;
713  }
714
715       
716#ifdef G4DEBUG_VIS_OGL
717  printf("G4OpenGLXViewer::generateEPSX\n");
718#endif
719 
720
721  if (!grabPixelsX (width, height,format,pixels)) {
722    return 1;
723  }
724#ifdef G4DEBUG_VIS_OGL
725    printf("--\n--\n--\n");
726#endif
727       
728  if (inColour) {
729    components = 3;
730  } else {
731    components = 1;
732  }
733         
734  fp = fopen (filnam, "w");
735  if (fp == NULL) {
736    return 2;
737  }
738         
739  fprintf (fp, "%%!PS-Adobe-2.0 EPSF-1.2\n");
740  fprintf (fp, "%%%%Title: %s\n", filnam);
741  fprintf (fp, "%%%%Creator: OpenGL pixmap render output\n");
742  fprintf (fp, "%%%%BoundingBox: 0 0 %d %d\n", width, height);
743  fprintf (fp, "%%%%EndComments\n");
744  fprintf (fp, "gsave\n");
745  fprintf (fp, "/bwproc {\n");
746  fprintf (fp, "    rgbproc\n");
747  fprintf (fp, "    dup length 3 idiv string 0 3 0 \n");
748  fprintf (fp, "    5 -1 roll {\n");
749  fprintf (fp, "    add 2 1 roll 1 sub dup 0 eq\n");
750  fprintf (fp, "    { pop 3 idiv 3 -1 roll dup 4 -1 roll dup\n");
751  fprintf (fp, "       3 1 roll 5 -1 roll } put 1 add 3 0 \n");
752  fprintf (fp, "    { 2 1 roll } ifelse\n");
753  fprintf (fp, "    }forall\n");
754  fprintf (fp, "    pop pop pop\n");
755  fprintf (fp, "} def\n");
756  fprintf (fp, "systemdict /colorimage known not {\n");
757  fprintf (fp, "   /colorimage {\n");
758  fprintf (fp, "       pop\n");
759  fprintf (fp, "       pop\n");
760  fprintf (fp, "       /rgbproc exch def\n");
761  fprintf (fp, "       { bwproc } image\n");
762  fprintf (fp, "   }  def\n");
763  fprintf (fp, "} if\n");
764  fprintf (fp, "/picstr %d string def\n", width * components);
765  fprintf (fp, "%d %d scale\n", width, height);
766  fprintf (fp, "%d %d %d\n", width, height, 8);
767  fprintf (fp, "[%d 0 0 %d 0 0]\n", width, height);
768  fprintf (fp, "{currentfile picstr readhexstring pop}\n");
769  fprintf (fp, "false %d\n", components);
770  fprintf (fp, "colorimage\n");
771         
772  curpix = (GLubyte*) pixels;
773  pos = 0;
774  for (i = width*height*components; i>0; i--) {
775    fprintf (fp, "%02hx ", *(curpix++));
776    if (++pos >= width) {
777      //    if (++pos >= 32) {
778      fprintf (fp, "\n");
779      pos = 0;
780    }
781  }
782  if (pos)
783    fprintf (fp, "\n");
784       
785  fprintf (fp, "grestore\n");
786  fprintf (fp, "showpage\n");
787  delete pixels;
788  fclose (fp);
789
790#ifdef G4DEBUG_VIS_OGL
791  printf("G4OpenGLXViewer::generateEPSX END\n");
792#endif
793
794  return 0;
795}
796       
797
798#endif
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