/home/master/UCL/VisualizationLibrary/src/vlGraphics/DrawCall.hpp

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

#include <vlGraphics/Array.hpp>
#include <vlGraphics/TriangleIterator.hpp>
#include <vlGraphics/IndexIterator.hpp>
#include <vlGraphics/PatchParameter.hpp>

namespace vl 
{
  //------------------------------------------------------------------------------
  // DrawCall
  //------------------------------------------------------------------------------
  class DrawCall: public Object
  {
    VL_INSTRUMENT_ABSTRACT_CLASS(vl::DrawCalls, Object)

  public:
    DrawCall(): mType(PT_TRIANGLES), mEnabled(true) {}

    DrawCall& operator=(const DrawCall& other)
    {
      mType      = other.mType;
      mEnabled   = other.mEnabled;
      return *this;
    }

    void setPrimitiveType(EPrimitiveType type) { mType = type; }

    EPrimitiveType primitiveType() const { return mType; }

    virtual void render(bool use_bo = true) const = 0;

    virtual ref<DrawCall> clone() const = 0;

    virtual void updateDirtyBufferObject(EBufferObjectUpdateMode) = 0;

    virtual void deleteBufferObject() = 0;

    void setEnabled(bool enable) { mEnabled = enable; }

    bool isEnabled() const { return mEnabled; }

    virtual TriangleIterator triangleIterator() const = 0;

    virtual IndexIterator indexIterator() const = 0;

    u32 countIndices() const
    {
      u32 count = 0;
      for( IndexIterator it = indexIterator(); it.hasNext(); it.next() )
        ++count;
      return count;
    }

    u32 countTriangles() const
    {
      u32 count = 0;
      for( TriangleIterator it = triangleIterator(); it.hasNext(); it.next() )
        ++count;
      return count;
    }

    virtual int instances() const { return 1; }

    virtual bool primitiveRestartEnabled() const { return false; }

    virtual unsigned int primitiveRestartIndex() { return 0; }

    void setPatchParameter(PatchParameter* patch_param) { mPatchParameter = patch_param; }

    PatchParameter* patchParameter() { return mPatchParameter.get(); }

    const PatchParameter* patchParameter() const { return mPatchParameter.get(); }

  protected:
    void applyPatchParameters() const
    {
      if (mType == PT_PATCHES && mPatchParameter)
        mPatchParameter->apply();

      if (mPatchParameter && mType != PT_PATCHES)
      {
        vl::Log::warning("PatchParameter used with non PT_PATCHES draw call!\n");
      }
      else
      if (!mPatchParameter && mType == PT_PATCHES)
      {
        vl::Log::warning("No PatchParameter supplied while using PT_PATCHES draw call!\n");
      }
    }

  protected:
      ref<PatchParameter> mPatchParameter;
      EPrimitiveType mType;
      bool mEnabled;
  };
}

#endif