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//
// $Id: G4OpenGLXViewer.cc,v 1.55 2009/05/13 10:28:00 lgarnier Exp $
// GEANT4 tag $Name:  $
//
// 
// Andrew Walkden  7th February 1997
// G4OpenGLXViewer : Class to provide XWindows specific
//                 functionality for OpenGL in GEANT4

#ifdef G4VIS_BUILD_OPENGLX_DRIVER

#include "G4OpenGLXViewer.hh"
#include "G4VViewer.hh"
#include "G4OpenGLSceneHandler.hh"
#include <GL/glu.h>

#include "G4OpenGLFontBaseStore.hh"

#include <sstream>

#include "G4VisExtent.hh"
#include "G4LogicalVolume.hh"
#include "G4VSolid.hh"
#include "G4Point3D.hh"
#include "G4Normal3D.hh"
#include "G4StateManager.hh"

#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/Xmu/StdCmap.h>

#include <assert.h>

int G4OpenGLXViewer::snglBuf_RGBA[12] =
{ GLX_RGBA,
  GLX_RED_SIZE, 1,
  GLX_GREEN_SIZE, 1, 
  GLX_BLUE_SIZE, 1,
  GLX_DEPTH_SIZE, 1,
  GLX_STENCIL_SIZE, 1,
  None };

int G4OpenGLXViewer::dblBuf_RGBA[13] =
{ GLX_RGBA,
  GLX_RED_SIZE, 1,
  GLX_GREEN_SIZE, 1,
  GLX_BLUE_SIZE, 1,
  GLX_DOUBLEBUFFER,
  GLX_DEPTH_SIZE, 1,
  GLX_STENCIL_SIZE, 1,
  None };

#define NewString(str) \
 ((str) != NULL ? (strcpy((char*)malloc((unsigned)strlen(str) + 1), str)) : (char*)NULL)

#define USE_DEFAULT_COLORMAP 1
#define USE_STANDARD_COLORMAP 0

XVisualInfo*  G4OpenGLXViewer::vi_single_buffer = 0;
XVisualInfo*  G4OpenGLXViewer::vi_double_buffer = 0;

extern "C" {
  static Bool G4OpenGLXViewerWaitForNotify (Display*, XEvent* e, char* arg) {
    return (e->type == MapNotify) && (e->xmap.window == (Window) arg);
  }
}

void G4OpenGLXViewer::SetView () {
  Bool success = glXMakeCurrent (dpy, win, cx);
  if (!success) {
    fViewId = -1;  // This flags an error.
    G4cerr << "G4OpenGLViewer::G4OpenGLViewer failed to attach a GLX context."
           << G4endl;
    GLint error = GL_NO_ERROR;
    while ((error = glGetError()) != GL_NO_ERROR) {
      G4cout << "GL Error: " << gluErrorString(error) << G4endl;
    }
    return;
  }
  G4OpenGLViewer::SetView ();  
}

void G4OpenGLXViewer::ShowView () {
  glXWaitGL (); //Wait for effects of all previous OpenGL commands to
                //be propagated before progressing.
  glFlush ();

  if (fVP.IsPicking()) {
    G4cout <<
      "Window activated for picking (left-mouse), exit (middle-mouse)."
	   << G4endl;
    while (true) {
      if (XPending(dpy)) {
	XNextEvent(dpy, &event);
	if (event.type == ButtonPress && event.xbutton.button == 1) {
	  Pick(event.xbutton.x, event.xbutton.y);
	}
	else if (event.type == ButtonPress && event.xbutton.button == 2) break;
      }
    }
  }
}

void G4OpenGLXViewer::GetXConnection () {
// get a connection.
  dpy = XOpenDisplay (0);
  if (!dpy) {
    fViewId = -1;  // This flags an error.
    G4cerr << "G4OpenGLViewer::G4OpenGLViewer couldn't open display." << G4endl;
    return;
  }

// make sure OpenGL is supported and installed properly.
  if (!glXQueryExtension (dpy, &errorBase, &eventBase)) {
    fViewId = -1;  // This flags an error.
    G4cerr << "G4OpenGLViewer::G4OpenGLViewer X Server has no GLX extension." 
	 << G4endl;
    return;
  }

}

void G4OpenGLXViewer::CreateGLXContext (XVisualInfo* v) {

  vi = v;
// get window's attributes
  if (!XGetWindowAttributes(dpy, XRootWindow (dpy, vi -> screen), &xwa)) {
    fViewId = -1;  // This flags an error.
    G4cerr << "G4OpenGLViewer::G4OpenGLViewer couldn't return window attributes"
	 << G4endl;
    return;
  }
  
// create a GLX context
  cx = glXCreateContext (dpy, vi, 0, true);
  if (!cx) {
    fViewId = -1;  // This flags an error.
    G4cerr << "G4OpenGLViewer::G4OpenGLViewer couldn't create context."
	 << G4endl;
    return;
  }

// New stab at getting a colormap

  Status status;
  XStandardColormap *standardCmaps = XAllocStandardColormap ();
  int i, numCmaps;

  status = XmuLookupStandardColormap (dpy, 
				      vi -> screen, 
				      vi -> visualid, 
				      vi -> depth, 
				      XA_RGB_DEFAULT_MAP, 
				      False, 
				      True);
  
  if (status == 1) {
    cmap = 0;
    status = XGetRGBColormaps (dpy, 
			       XRootWindow (dpy, vi -> screen), 
			       &standardCmaps, 
			       &numCmaps, 
			       XA_RGB_DEFAULT_MAP);
    if (status == 1)
      for (i = 0; i < numCmaps; i++) {
	if (standardCmaps[i].visualid == vi -> visualid) {
	  cmap = standardCmaps[i].colormap;
	  XFree (standardCmaps);
	  break;
	}
      }
    if (!cmap) {
      fViewId = -1;  // This flags an error.
      G4cerr <<
   "G4OpenGLViewer::G4OpenGLViewer failed to allocate a standard colormap."
	     << G4endl;
      return;
    }
    G4cout << "Got standard cmap" << G4endl;
  } else {
    cmap = XCreateColormap (dpy, 
			    XRootWindow(dpy, vi -> screen), 
			    vi -> visual, 
			    AllocNone);
    G4cout << "Created own cmap" << G4endl;
  }

  if (!cmap) {
    fViewId = -1;  // This flags an error.
    G4cerr << "G4OpenGLViewer::G4OpenGLViewer failed to allocate a Colormap."
	 << G4endl;
    return;
  }

}
  
void G4OpenGLXViewer::CreateMainWindow () {
  
// create a window
  swa.colormap = cmap;
  swa.border_pixel = 0;
  swa.event_mask = ExposureMask | ButtonPressMask | StructureNotifyMask;
  swa.backing_store = WhenMapped;

  // Window size and position...
  size_hints = XAllocSizeHints();
    
  ResizeWindow(fVP.GetWindowSizeHintX(),fVP.GetWindowSizeHintY());

  G4int x_origin = fVP.GetWindowAbsoluteLocationHintX(DisplayWidth(dpy, vi -> screen));

  // FIXME,  screen size != window size on MAC, but I don't know have to get the menuBar
  // size on MAC. L.Garnier 01/2009
  G4int y_origin = fVP.GetWindowAbsoluteLocationHintY(DisplayHeight(dpy, vi -> screen));

  size_hints->base_width = getWinWidth();
  size_hints->base_height = getWinHeight();
  size_hints->x = x_origin;
  size_hints->y = y_origin;
  if (fVP.IsWindowSizeHintX () && fVP.IsWindowLocationHintX () && fVP.IsWindowLocationHintY ()) {
    size_hints->flags |= PSize | PPosition;
  } else if (fVP.IsWindowSizeHintX () && !(fVP.IsWindowLocationHintX () || fVP.IsWindowLocationHintY ())) {
    size_hints->flags |= PSize;
  } else if ((!fVP.IsWindowSizeHintX ()) && fVP.IsWindowLocationHintX () && fVP.IsWindowLocationHintY ()) {
    size_hints->flags |= PPosition;
  }
  G4cout << "Window name: " << fName << G4endl;
  strncpy (charViewName, fName, 100);
  char *window_name = charViewName;
  char *icon_name = charViewName;
  //char tmpatom[] = "XA_WM_NORMAL_HINTS"; 
  wm_hints = XAllocWMHints();
  class_hints = XAllocClassHint();

  XStringListToTextProperty (&window_name, 1, &windowName);
  XStringListToTextProperty (&icon_name, 1, &iconName);

  wm_hints -> initial_state = NormalState;
  wm_hints -> input = True;
  wm_hints -> icon_pixmap = icon_pixmap;
  wm_hints -> flags = StateHint | IconPixmapHint | InputHint;

  class_hints -> res_name  = NewString("G4OpenGL");
  class_hints -> res_class = NewString("G4OpenGL");

   win = XCreateWindow (dpy, XRootWindow (dpy, vi -> screen), x_origin, 
                        y_origin, getWinWidth(), getWinHeight(), 0, vi -> depth,
                        InputOutput, vi -> visual,  
                        CWBorderPixel | CWColormap | 
                        CWEventMask | CWBackingStore,
                        &swa);
  
   XSetWMProperties (dpy, win, &windowName, &iconName, 0, 0, 
                     size_hints, wm_hints, class_hints);
  
// request X to Draw window on screen.
  XMapWindow (dpy, win);

// Wait for window to appear (wait for an "expose" event).
  XIfEvent (dpy, &event, G4OpenGLXViewerWaitForNotify, (char*) win);

// connect the context to a window
  Bool success = glXMakeCurrent (dpy, win, cx);
  if (!success) {
    fViewId = -1;  // This flags an error.
    G4cerr << "G4OpenGLViewer::G4OpenGLViewer failed to attach a GLX context."
	 << G4endl;
    GLint error = GL_NO_ERROR;
    while ((error = glGetError()) != GL_NO_ERROR) {
      G4cout << "GL Error: " << gluErrorString(error) << G4endl;
    }
    return;
  }

}

void G4OpenGLXViewer::CreateFontLists () {

  std::map<G4double,G4String> fonts;  // G4VMarker screen size and font name.
  fonts[10.] = "-adobe-courier-bold-r-normal--10-100-75-75-m-60-iso8859-1";
  fonts[11.] = "-adobe-courier-bold-r-normal--11-80-100-100-m-60-iso8859-1";
  fonts[12.] = "-adobe-courier-bold-r-normal--12-120-75-75-m-70-iso8859-1";
  fonts[13.] = "fixed";
  fonts[14.] = "-adobe-courier-bold-r-normal--14-100-100-100-m-90-iso8859-1";
  fonts[17.] = "-adobe-courier-bold-r-normal--17-120-100-100-m-100-iso8859-1";
  fonts[18.] = "-adobe-courier-bold-r-normal--18-180-75-75-m-110-iso8859-1";
  fonts[20.] = "-adobe-courier-bold-r-normal--20-140-100-100-m-110-iso8859-1";
  fonts[24.] = "-adobe-courier-bold-r-normal--24-240-75-75-m-150-iso8859-1";
  fonts[25.] = "-adobe-courier-bold-r-normal--25-180-100-100-m-150-iso8859-1";
  fonts[34.] = "-adobe-courier-bold-r-normal--34-240-100-100-m-200-iso8859-1";
  std::map<G4double,G4String>::const_iterator i;
  for (i = fonts.begin(); i != fonts.end(); ++i) {
    XFontStruct* font_info = XLoadQueryFont(dpy, i->second);
    if (!font_info) {
      G4cerr <<
	"G4OpenGLXViewer: XLoadQueryFont failed for font\n  "
	     << i->second
	     << G4endl;
      continue;
    }
    G4int font_base = glGenLists(256);
    if (!font_base) {
      G4cerr << "G4OpenGLXViewer: out of display lists for fonts." 
	     << G4endl;
      continue;
    }
    G4int first = font_info->min_char_or_byte2;
    G4int last  = font_info->max_char_or_byte2;
    glXUseXFont(font_info->fid, first, last-first+1,font_base+first);
    G4OpenGLFontBaseStore::AddFontBase(this,font_base,i->first,i->second);
  }
}

G4OpenGLXViewer::G4OpenGLXViewer (G4OpenGLSceneHandler& scene):
G4VViewer (scene, -1),
G4OpenGLViewer (scene),
vi_immediate (0),
vi_stored (0),
vi (0),
cmap (0)
{
  GetXConnection ();
  if (fViewId < 0) return;
  
  // Try for a visual suitable for OpenGLImmediate..
  // first try for a single buffered RGB window
  if (!vi_single_buffer) {
    vi_single_buffer =
      glXChooseVisual (dpy, XDefaultScreen (dpy), snglBuf_RGBA);
  }
  if (!vi_double_buffer) {
    vi_double_buffer =
      glXChooseVisual (dpy, XDefaultScreen (dpy), dblBuf_RGBA);
  }

  if (vi_single_buffer || vi_double_buffer) {
    if (!vi_double_buffer) {
      G4cout <<
	"G4OpenGLXViewer::G4OpenGLXViewer: unable to get a double buffer visual."
	"\n  Working with a single buffer."
	     << G4endl;
    }
  } else {
    if (!vi_single_buffer) {
      G4cout <<
	"G4OpenGLXViewer::G4OpenGLXViewer: unable to get a single buffer visual."
	     << G4endl;
    }
    if (!vi_double_buffer) {
      G4cout <<
	"G4OpenGLXViewer::G4OpenGLXViewer: unable to get a double buffer visual."
	     << G4endl;
    }
  }

  if (vi_single_buffer) {
    vi_immediate = vi_single_buffer;
    attributeList = snglBuf_RGBA;
  }
  
  if (!vi_immediate){
    // next try for a double buffered RGB, but Draw to top buffer
    if (vi_double_buffer) {
      vi_immediate = vi_double_buffer;
      attributeList = dblBuf_RGBA;
    }
  }

  // Now try for a visual suitable for OpenGLStored...
  // Try for a double buffered RGB window
  if (vi_double_buffer) {
    vi_stored = vi_double_buffer;
    attributeList = dblBuf_RGBA;
  }

  if (!vi_immediate || !vi_stored) {
    G4cout <<
    "G4OpenGLXViewer::G4OpenGLXViewer: unable to get required visuals."
	   << G4endl;
    fViewId = -1;  // This flags an error.
  }

  //  glClearColor (0., 0., 0., 0.);
  //  glClearDepth (1.);
}

G4OpenGLXViewer::~G4OpenGLXViewer () {
  if (fViewId >= 0) {
    //Close a window from here
    glXMakeCurrent (dpy, None, NULL);
    glXDestroyContext (dpy, cx);
    if (win) XDestroyWindow (dpy, win); // ...if already deleted in
    // sub-class G4OpenGLXmViewer.
    XFlush (dpy);
  }
}
	

#endif