mlrpolymesh.cpp

机甲指挥官2源代码

//===========================================================================//
// Copyright (C) Microsoft Corporation. All rights reserved.                 //
//===========================================================================//

#include "MLRHeaders.hpp"

#include "OwnTrace.hpp"

#if defined(TRACE_ENABLED) && defined(MLR_TRACE)
	BitTrace *MLRPolyMesh_Clip;
	#define SET_MLRPOLYMESH_CLIP() MLRPolyMesh_Clip->Set()
	#define CLEAR_MLRPOLYMESH_CLIP() MLRPolyMesh_Clip->Clear()
#else
	#define SET_MLRPOLYMESH_CLIP()
	#define CLEAR_MLRPOLYMESH_CLIP()
#endif

OwnTrace *clipTrace;

//#############################################################################
//###############################    MLRPolyMesh    ##################################
//#############################################################################

MLRPolyMesh::ClassData*
	MLRPolyMesh::DefaultData = NULL;

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::InitializeClass()
{
	Verify(!DefaultData);
	DefaultData =
		new ClassData(
			MLRPolyMeshClassID,
			"MidLevelRenderer::MLRPolyMesh",
			MLRPrimitive::DefaultData,
			(MLRPrimitive::Factory)&Make
		);
	Register_Object(DefaultData);

	#if defined(TRACE_ENABLED) && defined(MLR_TRACE)
		MLRPolyMesh_Clip = new BitTrace("MLRPolyMesh_Clip");
		Register_Object(MLRPolyMesh_Clip);
	#endif

	clipTrace = new OwnTrace("Clip Timing");
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::TerminateClass()
{
	Unregister_Object(DefaultData);
	delete DefaultData;
	DefaultData = NULL;

	#if defined(TRACE_ENABLED) && defined(MLR_TRACE)
		Unregister_Object(MLRPolyMesh_Clip);
		delete MLRPolyMesh_Clip;
	#endif
	
	clipTrace->Print();
	delete clipTrace;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
MLRPolyMesh::MLRPolyMesh(
	MemoryStream *stream,
	int version
) :
	MLRPrimitive(DefaultData, stream, version)
{
	Check_Pointer(this);
	Check_Pointer(stream);

	facePlanes.SetLength(GetNumPrimitives());
	testList.SetLength(GetNumPrimitives());

	FindFacePlanes();
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
MLRPolyMesh::MLRPolyMesh():
	MLRPrimitive(DefaultData)
{
	Check_Pointer(this);

	drawMode = SortData::TriList;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
MLRPolyMesh::~MLRPolyMesh()
{
	Check_Object(this);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
MLRPolyMesh*
	MLRPolyMesh::Make(
		MemoryStream *stream,
		int version
	)
{
	return new MLRPolyMesh(stream, version);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::Save(MemoryStream *stream)
{
	Check_Object(this);
	Check_Object(stream);

	MLRPrimitive::Save(stream);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::TestInstance() const
{
	Verify(IsDerivedFrom(DefaultData));
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::SetPrimitiveLength (unsigned char *data, int numPrimitives)
{
	Check_Object(this); 

	lengths.AssignData(data, numPrimitives);

	facePlanes.SetLength(numPrimitives);

	testList.SetLength(numPrimitives);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::GetPrimitiveLength (unsigned char **data, int *l)
{
	Check_Object(this); 
	*l = lengths.GetLength();
	*data = lengths.GetData();
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::FindFacePlanes()
{
	Check_Object(this); 

	int i, j, stride, numPrimitives = GetNumPrimitives();
	Vector3D v;

	for(i=0,j=0;i<numPrimitives;i++)
	{
		stride = lengths[i];

		facePlanes[i].BuildPlane(
			coords[j],
			coords[j+1],
			coords[j+2]
		);
		j += stride;
	}
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
int
	MLRPolyMesh::FindBackFace(const Point3D& u)
{
	Check_Object(this);

	unsigned char *iPtr;
	int i, numPrimitives = GetNumPrimitives();
	int ret = 0, len = lengths.GetLength();
	Plane *p;

	if(len <= 0)
	{
		visible = 0;

		return 0;
	}

	p = &facePlanes[0];
	iPtr = &testList[0];

	if(state.GetBackFaceMode() == MLRState::BackFaceOffMode)
	{
		for(i=0;i<numPrimitives;i++,p++,iPtr++)
		{
#if defined(_ARMOR)
			*iPtr = (p->DistanceTo(u) >= 0.0f) ? (unsigned char)1: (unsigned char)0;

			Verify (*iPtr != (unsigned char)0);
#else
			*iPtr = (unsigned char)1;
#endif
		}
		ret = (unsigned char)1;
	}
	else
	{
		for(i=0;i<numPrimitives;i++,p++,iPtr++)
		{
			*iPtr = (p->DistanceTo(u) >= 0.0f) ? (unsigned char)1: (unsigned char)0;
			
			ret += *iPtr;
		}

		visible = ret ? (unsigned char)1 : (unsigned char)0;
	}

	return ret;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::ResetTestList()
{
	int i, numPrimitives = GetNumPrimitives();
	unsigned char *iPtr = &testList[0];

	for(i=0;i<numPrimitives;i++,iPtr++)
	{
		*iPtr = 1;
	}

}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::Transform(Matrix4D *mat)
{
	Check_Object(this);

	int i, j, k;
	int pLen, len = lengths.GetLength();

	for(i=0,j=0;i<len;i++)
	{
		pLen = lengths[i];

		if(testList[i] != 0)
		{
			for(k=j;k<pLen+j;k++)
			{
				transformedCoords[k].Multiply(coords[k], *mat);
			}
			
			#ifdef LAB_ONLY
				Statistics::MLR_TransformedVertices += pLen;
			#endif
		}

		j += pLen;
	}
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	MLRPolyMesh::TransformNoClip(Matrix4D *mat, GOSVertexPool *vt)
{
	Check_Object(this);

	SET_MLRPOLYMESH_CLIP();

	int i, j, k, stride;
	int len = lengths.GetLength();

	if(len <= 0)
	{
		visible = 0;
		return;
	}

	Check_Object(vt);
	gos_vertices = vt->GetActualVertexPool();
	numGOSVertices = 0;

	//
	//-------------------------------
	// Handle the non-indexed version
	//-------------------------------
	//

	for(i=0,j=0;i<len;i++)
	{
		stride = lengths[i];

		Verify(stride >= 3);

		if(testList[i] == 0)
		{
			j += stride;
			continue;
		}

		for(k=j;k<stride+j;k++)
		{
			transformedCoords[k].Multiply(coords[k], *mat);
		}
		
		#ifdef LAB_ONLY
			Statistics::MLR_TransformedVertices += stride;
		#endif

		//
		//--------------------------------------------------------
		// JM claims all vertices are in. lets check it. who knows
		//--------------------------------------------------------
		//
		#if defined(_ARMOR)
			for(k=j;k<j+stride;k++)
			{
				Verify(transformedCoords[k].x >= 0.0f && transformedCoords[k].x <= transformedCoords[k].w );
				Verify(transformedCoords[k].y >= 0.0f && transformedCoords[k].y <= transformedCoords[k].w );
				Verify(transformedCoords[k].z >= 0.0f && transformedCoords[k].z <= transformedCoords[k].w );
			}
		#endif
		for(k=1;k<stride-1;k++)
		{
			Verify((vt->GetLast() + 3 + numGOSVertices) < vt->GetLength());
			Verify((*actualColors).GetLength() == coords.GetLength());
			Verify(texCoords.GetLength() == coords.GetLength());

			GOSCopyTriangleData(
				&gos_vertices[numGOSVertices],
				transformedCoords.GetData(),
				actualColors->GetData(),
				texCoords.GetData(),
				j, j+k+1, j+k
			);


			numGOSVertices += 3;
		}

#ifdef LAB_ONLY
		Statistics::MLR_NonClippedVertices += stride;
#endif

		j += stride;
	}

	Check_Object(vt);
	vt->Increase(numGOSVertices);
	
	visible = numGOSVertices ? 1 : 0;

	CLEAR_MLRPOLYMESH_CLIP();
}

static MLRClippingState theAnd, theOr, theTest;

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Now it gets serious
int
	MLRPolyMesh::Clip(MLRClippingState clippingFlags, GOSVertexPool *vt)
{
	clipTrace->Start();
	SET_MLRPOLYMESH_CLIP();

	Check_Object(this);

	static int clipTrick[6][2] = {
		{ 1, 1},
		{ 1, 0},
		{ 0, 1},
		{ 0, 0},
		{ 2, 0},
		{ 2, 1}
	};

	int i, j, k, l;
	int stride, end, len = lengths.GetLength();

	int mask, k1, ct=0, ret = 0;
	Scalar a=0.0f, bc0, bc1;
	
	Verify(len == testList.GetLength());
	Verify(clippingFlags.GetClippingState() != 0);

	//
	//--------------------------------------
	// See if we don't have to draw anything
	//--------------------------------------
	//
	if(len <= 0)
	{
		visible = 0;

		CLEAR_MLRPOLYMESH_CLIP();
		clipTrace->Stop();

		return visible;
	}

	int	myNumberUsedClipVertex, myNumberUsedClipIndex, myNumberUsedClipLength;

	myNumberUsedClipVertex = 0;
	myNumberUsedClipIndex = 0;
	myNumberUsedClipLength = 0;

	//
	//-----------------------------------------------------------------
	// Step through each polygon, making sure that we don't try to clip
	// backfaced polygons
	//-----------------------------------------------------------------
	//
	for(i=0,j=0;i<len;i++)
	{
		stride = lengths[i];

		if(testList[i] == 0)
		{
			j += stride;
			continue;
		}

		//
		//---------------------------------------------------------------
		// Test each vertex of the polygon against the allowed clipping
		// planes, and accumulate status for which planes always clip and
		// which planes clipped at least once
		//---------------------------------------------------------------
		//
		theAnd.SetClippingState(0x3f);
		theOr.SetClippingState(0);

		end = j+stride;

		Stuff::Vector4D *v4d = transformedCoords.GetData() + j;
		MLRClippingState *cs = clipPerVertex.GetData() + j;
		
		for(k=j;k<end;k++,v4d++,cs++)
		{
			cs->SetClippingState(0);

			if( clippingFlags.IsFarClipped() && v4d->w < v4d->z)
			{
				cs->SetFarClip();
			}

			if( clippingFlags.IsNearClipped() && v4d->z < 0.0f)
			{
				cs->SetNearClip();
			}

			if( clippingFlags.IsRightClipped() && v4d->x < 0.0f)
			{
				cs->SetRightClip();
			}

			if( clippingFlags.IsLeftClipped() && v4d->w < v4d->x)
			{
				cs->SetLeftClip();
			}

			if( clippingFlags.IsBottomClipped() && v4d->y < 0.0f)
			{
				cs->SetBottomClip();
			}

			if(clippingFlags.IsTopClipped() && v4d->w < v4d->y)
			{
				cs->SetTopClip();
			}

			theAnd &= *cs;

			theOr |= *cs;

			theAnd = theOr = 0;

#ifdef LAB_ONLY
			if(clipPerVertex[k]==0)
			{
				Statistics::MLR_NonClippedVertices++;
			}
			else
			{
				Statistics::MLR_ClippedVertices++;
			}
#endif
		}

		//
		//-------------------------------------------------------------------
		// If any bit is set for all vertices, then the polygon is completely
		// outside the viewing space and we don't have to draw it.  On the
		// other hand, if no bits at all were ever set, we can do a trivial
		// accept of the polygon
		//-------------------------------------------------------------------
		//
		if (theAnd != 0)
		{
			testList[i] = 0;
		}
		else if (theOr == 0)
		{

			ret++;
		}

		//
		//-----------------------------------------------------------------
		// It is not a trivial case, so we must now do real clipping on the
		// polygon
		//-----------------------------------------------------------------
		//
		else
		{
			unsigned short numberVerticesPerPolygon = 0;

			//
			//---------------------------------------------------------------
			// Handle the case of a single clipping plane by stepping through
			// the vertices and finding the edge it originates
			//---------------------------------------------------------------
			//
			if (theOr.GetNumberOfSetBits() == 1)
			{
				for(k=j;k<end;k++)
				{