/*
 * Copyright © 2011-2020 Frictional Games
 * 
 * This file is part of Amnesia: A Machine For Pigs.
 * 
 * Amnesia: A Machine For Pigs is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version. 

 * Amnesia: A Machine For Pigs is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Amnesia: A Machine For Pigs.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "graphics/Renderable.h"

#include "math/Math.h"
#include "math/Frustum.h"
#include "system/LowLevelSystem.h"

namespace hpl {

	//////////////////////////////////////////////////////////////////////////
	// CONSTRUCTORS
	//////////////////////////////////////////////////////////////////////////

	//-----------------------------------------------------------------------
	
	iRenderable::iRenderable(const tString &asName) : iEntity3D(asName)
	{
		mlLastMatrixCount = -1;

		mbStatic = false;

		mlRenderFlags =eRenderableFlag_VisibleInReflection | eRenderableFlag_VisibleInNonReflection;
		
		mfIlluminationAmount = 1.0f;
		mfCoverageAmount = 1.0f;

		mlRenderFrameCount = -1;
		
		mlCalcScaleMatrixCount = -1;
		mvCalcScale = cVector3f(1,1,1);

		mbForceShadow = false;

		mbIsOneSided = false;
		mvOneSidedNormal =0;

		mpModelMatrix = NULL;

		mfViewSpaceZ = 0;

		mbIsVisible = true;

		mlLargePlaneSurfacePlacement = 0;

		mpRenderCallback = NULL;

		mpRenderContainerNode = NULL;

		mpRenderableUserData = NULL;

        mfShaderTimer = 0.0f;
	}
	
	//-----------------------------------------------------------------------

	//////////////////////////////////////////////////////////////////////////
	// PUBLIC METHODS
	//////////////////////////////////////////////////////////////////////////
	
	//-----------------------------------------------------------------------

	void iRenderable::SetRenderFlagBit(tRenderableFlag alFlagBit, bool abSet)
	{
		if(abSet)	mlRenderFlags |= alFlagBit;
		else		mlRenderFlags &= (~alFlagBit); 

		if(mpRenderCallback) mpRenderCallback->OnRenderFlagsChange(this);
	}

	//-----------------------------------------------------------------------

	void iRenderable::SetVisible(bool abVisible)
	{
		mbIsVisible = abVisible;

		OnChangeVisible();

		if(mpRenderCallback) mpRenderCallback->OnVisibleChange(this);
	}

	//-----------------------------------------------------------------------
	
	cMatrixf* iRenderable::GetInvModelMatrix()
	{
		cMatrixf *pModelMatrix = GetModelMatrix(NULL);
		if(pModelMatrix==NULL) return NULL;

		if(mlLastMatrixCount != GetMatrixUpdateCount())
		{
			mlLastMatrixCount = GetMatrixUpdateCount();
						
			m_mtxInvModel = cMath::MatrixInverse(*pModelMatrix);
		}
		
		return &m_mtxInvModel;
	}

	//-----------------------------------------------------------------------

	void iRenderable::SetCoverageAmount(float afX)
	{
		if(mfCoverageAmount == afX) return;

		mfCoverageAmount = afX;

        //A little hack so that shadows are updated
		SetTransformUpdated(false);
	}

	//-----------------------------------------------------------------------
	
	const cVector3f& iRenderable::GetCalcScale()
	{
		cMatrixf *pModelMatrix = GetModelMatrix(NULL);
		
		if(pModelMatrix != NULL && mlCalcScaleMatrixCount != GetMatrixUpdateCount())
		{
			mlCalcScaleMatrixCount = GetMatrixUpdateCount();
			mvCalcScale.x = pModelMatrix->GetRight().Length();
			mvCalcScale.y = pModelMatrix->GetUp().Length();
			mvCalcScale.z = pModelMatrix->GetForward().Length();
		}

		return mvCalcScale;
	}
	
	//-----------------------------------------------------------------------
	
	bool iRenderable::CollidesWithBV(cBoundingVolume *apBV)
	{
		return cMath::CheckBVIntersection(*GetBoundingVolume(), *apBV);
	}
	
	//-----------------------------------------------------------------------

	bool iRenderable::CollidesWithFrustum(cFrustum *apFrustum)
	{
		return apFrustum->CollideBoundingVolume(GetBoundingVolume()) != eCollision_Outside; 
	}
	
	//-----------------------------------------------------------------------
}
