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/*  Visualization Library                                                             */
/*  http://visualizationlibrary.org                                                   */
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#ifndef EnableSet_INCLUDE_ONCE
#define EnableSet_INCLUDE_ONCE

#include <vlCore/Object.hpp>
#include <vlCore/vlnamespace.hpp>
#include <vector>

namespace vl
{
  /**
   * A set of enables managed by Shader.
   * This class substitutes for the most part the OpenGL functions glEnable() and glDisable().
   *
   * \sa Shader, Effect, Actor
  */
  class EnableSet: public Object
  {
    VL_INSTRUMENT_CLASS(vl::EnableSet, Object)

  public:
    EnableSet(): mBlendingEnabled(false)
    {
      VL_DEBUG_SET_OBJECT_NAME()
      // these two are enabled by default
      mEnables.push_back(EN_DITHER);
      // only OpenGL ES 2 does not support GL_MULTISAMPLE
#if !defined(VL_OPENGL_ES2)
      mEnables.push_back(EN_MULTISAMPLE);
#endif
    }

    // enable getter and setters

    void enable(EEnable capability)
    {
      if (capability == EN_BLEND)
        mBlendingEnabled = true;
      for(unsigned i=0; i<mEnables.size(); ++i)
        if (mEnables[i] == capability)
          return;
      mEnables.push_back( capability );
    }

    void disable(EEnable capability)
    {
      if (capability == EN_BLEND)
        mBlendingEnabled = false;
      for(unsigned i=0; i<mEnables.size(); ++i)
      {
        if (mEnables[i] == capability)
        {
          mEnables.erase( mEnables.begin() + i );
          return;
        }
      }
    }

    const std::vector<EEnable>& enables() const { return mEnables; }

    int isEnabled(EEnable capability) const
    {
      for(unsigned i=0; i<mEnables.size(); ++i)
        if (mEnables[i] == capability)
          return true;
      return false;
    }

    void disableAll() { mEnables.clear(); mBlendingEnabled=false; }

    bool isBlendingEnabled() const { return mBlendingEnabled; }

  protected:
    std::vector<EEnable> mEnables;
    bool mBlendingEnabled;
  };
}

#endif