TridOpenGLGlobal.cxx

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#include <cassert>

#include "TridOpenGLGlobal.h"

#include "TROOT.h"
#include "TSystem.h"

#include "GL/gl.h"
#include "glf.h"
#include <dlfcn.h>

#include "MessageService/MsgService.h"

//ClassImp(TridOpenGLGlobal)

TridOpenGLGlobal* TridOpenGLGlobal::sInstance = NULL;


CVSID("$Id: TridOpenGLGlobal.cxx,v 1.9 2006/12/03 02:08:16 gmieg Exp $");

// Get instance of singleton
TridOpenGLGlobal& TridOpenGLGlobal::Instance( void ) 
{
  if(sInstance==NULL) {
    sInstance = new TridOpenGLGlobal();
  }
  assert(sInstance);
  return (*sInstance);
}

// Ctor
TridOpenGLGlobal::TridOpenGLGlobal( void ) 
{
  fGL_Started = false;
  fGLF_Started = false;
  fGLF_Font = "";

  // Load the GL libraries. These may be loaded by ROOT
  // anyway, but who cares?
  fGL_Started = true;

  #ifdef __APPLE__
  fLibGLHandle = dlopen("libGL.dylib", RTLD_LAZY);
  if(!fLibGLHandle) {
     fGL_Started = false;
     cerr << "Error on load of libGL:  " << dlerror() << endl;
  }
  fLibGLUHandle = dlopen("libGLU.dylib", RTLD_LAZY | RTLD_GLOBAL);
  if(!fLibGLUHandle) {
     fGL_Started = false;
     cerr << "Error on load of libGLU: " << dlerror() << endl;
  }
  #else
  fLibGLHandle = dlopen("libGL.so", RTLD_LAZY);
  if(!fLibGLHandle) {
     fGL_Started = false;
     cerr << "Error on load of libGL:  " << dlerror() << endl;
  }
  fLibGLUHandle = dlopen("libGLU.so", RTLD_LAZY | RTLD_GLOBAL);
  if(!fLibGLUHandle) {
     fGL_Started = false;
     cerr << "Error on load of libGLU: " << dlerror() << endl;
  }
  #endif

  if(fGL_Started == false) {
    cerr << "TriD could not load the GL libraries!" << endl;
    cerr << "Make sure your system has OpenGL (or Mesa) installed correctly!" << endl;
    
  }
}



TridOpenGLGlobal::~TridOpenGLGlobal( void )
{
  if(fGLF_Started) glfUnloadFont();
  if(fLibGLHandle) dlclose(fLibGLHandle);
  if(fLibGLHandle) dlclose(fLibGLUHandle);
}


// Get a font
int TridOpenGLGlobal::GlfLoadFont(const char* fontfile)
{
  // Look for the font file. Throw an error if we can't find it.
  string basename = fontfile;
  if(strlen(fontfile)==0) basename = "arial1.glf";
  
  // Look in the code directories. This should be safe; code
  // libraries won't exist only on 'production' farms, which
  // shouldn't be doing viewing anyway.

  const char* private_context = gSystem->Getenv("SRT_PRIVATE_CONTEXT");
  const char* public_context = gSystem->Getenv("SRT_PUBLIC_CONTEXT");
  const char* trid_dir       = gSystem->Getenv("TRID");

  string path = "./";
  if(private_context) path += string(":") + string(private_context) + string("/TriD/fonts/");
  if(public_context)  path += string(":") + string(public_context) + string("/TriD/fonts/");
  if(trid_dir)        path += string(":") + string(trid_dir);
  
  char* pathname = gSystem->Which(path.c_str(),basename.c_str());
  if(pathname==0) {
    MSG("TriD",Msg::kFatal) << "TridOpenGLGlobal: Cannot find requested font " << basename << endl;
    return 1;
  }
  MSG("TriD",Msg::kDebug) << "Found font path: " << pathname << endl;
  
  if(fGLF_Started == false) {
    glfInit();
    fGLF_Started=true;
  } else {
    glfUnloadFont();
  }
  glfLoadFont(pathname);
  return 0;
}

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