//-----------------------------------------------------------------------------
// Torque Game Engine
// Copyright (C) GarageGames.com, Inc.
//-----------------------------------------------------------------------------

#ifndef _DETAILMANAGER_H_
#define _DETAILMANAGER_H_

#ifndef _PLATFORMASSERT_H_
#include "platform/platformAssert.h"
#endif
#ifndef _MMATH_H_
#include "math/mMath.h"
#endif
#ifndef _TVECTOR_H_
#include "core/tVector.h"
#endif

#define MAX_BUMP 4

class TSShapeInstance;
class TSPartInstance;

class DetailManager
{
public:

   struct DetailData
   {
      S32 tag;
      TSShapeInstance * shapeInstance; // either this
      TSPartInstance * partInstance;   // or this
      S16 bump[MAX_BUMP];
      S16 dls[MAX_BUMP];
      S32 dl;
      F32 intraDL;
      S32 prevDL;
      F32 pixelSize;
      F32 priority;
   };

   struct DetailProfile
   {
      S32 skipFirst; // for how many rounds do we want to skip "bumping" first detail
      S32 skipMiddle; // for how many rounds do we want to skip "bumping" every middle detail
      S32 skipLast;  // for how many rounds do we want to skip "bumping" last detail
   };

   static DetailProfile smDefaultProfile;

private:

   static DetailManager * smDetailManager;
   static DetailManager * get() { AssertFatal(smDetailManager,"DetailManager::get"); return smDetailManager; }

   S32 mTag;
   S32 mPolyLimit; // our poly budget...computed at the start of each frame based on detail scale
   bool mInPrepRender;

   S32 mPolyCount; // current poly count
   S32 mBumpPolyCount[MAX_BUMP]; // number of polys we save at each "bump" level

   Vector<DetailData*> mDetailData;
   Vector<DetailData*> mFreeDetailData;

   void begin();
   void end();

   void selectPotential(TSShapeInstance * si, F32 dist, F32 invScale, const DetailProfile * dp = &smDefaultProfile);
   bool selectCurrent(TSShapeInstance * si);

   void selectPotential(TSPartInstance * pi, F32 dist, F32 invScale, const DetailProfile * dp = &smDefaultProfile);
   bool selectCurrent(TSPartInstance * pi);

   void bumpOne(DetailData*, S32 bump);
   void bumpAll(S32 bump);

   void computePriority(DetailData *, S32 bump);
   DetailData * getNewDetailData();

public:

   DetailManager();
   ~DetailManager();

   static F32 smDetailScale; // user can adjust this

   static S32 smMaxPolyLimit; // app sets this once -- or uses default value
   static S32 smMinPolyLimit; // app sets this once -- or uses default value
   static S32 smLimitRange;   // app sets this once -- or uses default value

   static S32 smPolysTriedToRender;  // not used here, but can be read for misc. uses
   static S32 smPolysDidRender;      // not used here, but can be read for misc. uses

   static void init() { AssertFatal(!smDetailManager,"DetailManger::init"); smDetailManager = new DetailManager; }
   static void shutdown() { delete smDetailManager; smDetailManager = NULL; }

   static void beginPrepRender() { get()->begin(); }
   static void endPrepRender() { get()->end(); }

   static void selectPotentialDetails(TSShapeInstance * si, F32 dist, F32 invScale) { get()->selectPotential(si,dist,invScale); }
   static bool selectCurrentDetail(TSShapeInstance * si) { return get()->selectCurrent(si); }

   static void selectPotentialDetails(TSPartInstance * pi, F32 dist, F32 invScale) { get()->selectPotential(pi,dist,invScale); }
   static bool selectCurrentDetail(TSPartInstance * pi) { return get()->selectCurrent(pi); }
};

#endif