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/*  Visualization Library                                                             */
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#ifndef OcclusionCullRenderer_INCLUDE_ONCE
#define OcclusionCullRenderer_INCLUDE_ONCE

#include <vlGraphics/Renderer.hpp>

namespace vl
{
  //------------------------------------------------------------------------------
  // OcclusionCullRenderer
  //------------------------------------------------------------------------------
  class VLGRAPHICS_EXPORT OcclusionCullRenderer: public Renderer
  {
    VL_INSTRUMENT_CLASS(vl::OcclusionCullRenderer, Renderer)

  public:
    OcclusionCullRenderer();

    virtual const RenderQueue* render(const RenderQueue* in_render_queue, Camera* camera, real frame_clock);

    void setWrappedRenderer(Renderer* renderer);

    const Renderer* wrappedRenderer() const { return mWrappedRenderer.get(); }

    Renderer* wrappedRenderer() { return mWrappedRenderer.get(); }

    void setOcclusionThreshold(int threshold) { mOcclusionThreshold = threshold; }

    int occlusionThreshold() const { return mOcclusionThreshold; }

    const Framebuffer* framebuffer() const;

    Framebuffer* framebuffer();

    int statsTotalObjects() const { return mStatsTotalObjects; }

    int statsOccludedObjects() const { return mStatsOccludedObjects; }

    Shader* occlusionShader() { return mOcclusionShader.get(); }

    const Shader* occlusionShader() const { return mOcclusionShader.get(); }

    void setOcclusionShader(Shader* occ_sh) { mOcclusionShader = occ_sh; }

  protected:
    void render_pass1(const RenderQueue* in_render_queue);

    void render_pass2(const RenderQueue* in_render_queue, Camera* camera);

  protected:
    vl::ref<Renderer> mWrappedRenderer;
    ref<Shader> mOcclusionShader;
    ref<RenderQueue> mCulledRenderQueue;
    int mOcclusionThreshold;
    Renderer* mPrevWrapRenderer;
    int mStatsTotalObjects;
    int mStatsOccludedObjects;
  };
  //------------------------------------------------------------------------------
}

#endif