cvshapes.cpp

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		int numFacesAdded;
		ChNrMeshAddFaces(mesh,
				       numVerts,
				       (ChNrVector*) v,
				       numNorms,
				       (ChNrVector*) n,
				       face_data,
				       &numFacesAdded,
				       &facesAdded);
		
		#if defined(CH_USE_D3D)
		numFacesAdded = facesAdded->GetSize();
		#endif

		// Assign colors to faces
		int iface = 0;
		ChNrFace elt;
		if(pNode->parts.value & QvCylinder::TOP)
		{
			int count = 1;	// count
			if(!boolCull) count *= 2;
			for( int j = 0; j < count; j ++)
			{	
				GetElement(facesAdded, unsigned(iface), elt);
				if(boolUseTexture) 
					SetTextureCoordinates(pTxMap, mesh, elt, Top); 
				materialMap.Set(mesh, elt, ChQvCylinderMaterials::Top);
				D3DRelease(elt);
				iface++;
			}
		}

		// Do the bottom
		if(pNode->parts.value & QvCylinder::BOTTOM)
		{
			int count = 1;	// count
			if(!boolCull) count *= 2;
			for( int j = 0; j < count; j ++)
			{
				GetElement(facesAdded, unsigned(iface), elt);
				if(boolUseTexture) 
					SetTextureCoordinates(pTxMap, mesh, elt, Bottom); 
				materialMap.Set(mesh, elt, ChQvCylinderMaterials::Bottom);
				D3DRelease(elt);
				iface++;
			}
		}

		// Do the sides
		if(pNode->parts.value & QvCylinder::SIDES)
		{
			int count = numFacets;	// count
			if(!boolCull) count *= 2;
			for( int j = 0; j < count; j ++)
			{
				GetElement(facesAdded, unsigned(iface), elt);
				if(boolUseTexture && j < numFacets) 
					SetTextureCoordinates(pTxMap, mesh, elt, Sides, j % numFacets); 
				materialMap.Set(mesh, elt, ChQvCylinderMaterials::Sides);
				D3DRelease(elt);
				iface++;
			}
		}


		if(boolUseTexture)
		{
			ChTextureHandle hdl = pTextureData->GetTextureHandle();
			if(hdl)
			{
				// Texture guy got here first, apply it
				//ChNrMeshSetTexture(mesh, hdl);
				SetTexture(pTextureData);

			}
		}  
													  
													  
													  // Cleanup time
 		ChNrFree(facesAdded);							  
		delete [] v;
		delete [] n;
		delete [] face_data;
		delete pTxMap;

		pIterator->DidAShape();
		pRC->UnlockScene();		
		pRC->UnlockQv();		   // Unlock tree 

	}
#endif
	return true;
}

bool ChQvCylinderInstance::Draw(ChRenderContext *pRC, ChDrawIterator *pIterator)
{
#if defined( CH_USE_3DR )
	{
		Fixed32_t On = 1;
		Fixed32_t Off = 0;

		G3dHandle_t hGC = pRC->GetGC();
		Dword_t  hRC = pRC->GetRC();
		QvCylinder *pNode = (QvCylinder *)GetNode();
		pRC->SetModelTransform(GetTransform());

		pRC->SetShading(this);

		Float_t		cull = 0;
		Fixed32_t wMattNum = 0;	  // always use material 0

		if(pNode->parts.value == QvCylinder::ALL) cull = 1;	// if all sides are present, then cull
		G3dSetMatt( hGC,  wMattNum, G3DM_BACK_CULL,	(Float_t *)&cull );
	
		int numFacets = CalcCylinderFacetCount(this, state);

		// Make a material mapping; we will use later for each facet, top and bottom
		ChQvCylinderMaterials materialMap( this );

		/* Do the texture stuff - find it, make the map, set up 3dr for it, */
		int boolUseTexture = SetupTexture(pRC);
		ChQvCylinderTextures	*pTxMap = 0;
		if(boolUseTexture)
		{
			pTxMap = new ChQvCylinderTextures( this, numFacets );
		}
	
		float h2 = pNode->height.value / 2.;
		float r = pNode->radius.value;

		Fixed32_t lCCW;
		G3dGetState( hGC, G3DL_FRONT_CCW, &lCCW); // save CCW state
		G3dSetState( hGC, G3DL_FRONT_CCW, &On);

	
		bool boolPureEmissive;
		float pi = atan(1.) * 4.;
		float twoPi = pi * 2;

		// Do the sides
		if(pNode->parts.value & QvCylinder::SIDES)
		{
			materialMap.Set(hRC, hGC, 0, &boolPureEmissive);
			pRC->SetModulation( boolUseTexture, boolPureEmissive);

			G3dBeginPrim(hGC, G3D_PRM_QUADSTRIP, numFacets * 2 + 2);
			for( int facet = 0; facet <= numFacets; facet ++)
			{
				PointF_t n, v1, v2;
				float theta = facet * twoPi / numFacets;
				n.x = -sin(theta);
				n.y = 0;
				n.z = -cos(theta);
		 
				v1.x = n.x * r;
				v1.y = h2;
				v1.z = n.z * r;

				v2 = v1;
				v2.y = -h2;
		

				if(boolUseTexture)
				{
					PointF_t textCoord = pTxMap->GetCoord3(0, facet, 0);
					G3dAddPrimVtxF(hGC, &v1, &n, &textCoord, 0);

					textCoord = pTxMap->GetCoord3(0, facet, 1);
					G3dAddPrimVtxF(hGC, &v2, &n, &textCoord, 0);
				}
				else
				{
					G3dAddPrimVtxF(hGC, &v1, &n, 0, 0);
					G3dAddPrimVtxF(hGC, &v2, &n, 0, 0);
				}
			}
			G3dEndPrim(hGC);
		}
		G3dSetState( hGC, G3DL_FRONT_CCW, &On);

		// Do the top
		if(pNode->parts.value & QvCylinder::TOP)
		{
			materialMap.Set(hRC, hGC, 1 /*top*/, &boolPureEmissive);
			pRC->SetModulation( boolUseTexture, boolPureEmissive);

			G3dBeginPrim(hGC, G3D_PRM_POLYGON, numFacets);
			PointF_t n, v1;
			n.x = 0;
			n.y = 1;
			n.z = 0;
			for( int j = 0; j <= numFacets; j ++)
			{
				float theta = j * twoPi / numFacets;
				v1.x = -sin(theta) * r;
				v1.y = h2;
				v1.z = -cos(theta) * r;
		 
				if(boolUseTexture)
				{
					PointF_t textCoord = pTxMap->GetCoord3(1, 0, j);
					G3dAddPrimVtxF(hGC, &v1, &n, &textCoord, 0);
				}
				else
				{
					G3dAddPrimVtxF(hGC, &v1, &n, 0, 0);
				}
			}
			G3dEndPrim(hGC);
		}

		// Do the bottom
		G3dSetState( hGC, G3DL_FRONT_CCW, &Off);
		if(pNode->parts.value & QvCylinder::BOTTOM)
		{
			materialMap.Set(hRC, hGC, 2 /*bottom*/, &boolPureEmissive);
			pRC->SetModulation( boolUseTexture, boolPureEmissive);

			G3dBeginPrim(hGC, G3D_PRM_POLYGON, numFacets);
			PointF_t n, v1;
			n.x = 0;
			n.y = -1;
			n.z = 0;
			for( int j = 0; j <= numFacets; j ++)
			{
				float theta = j * twoPi / numFacets;
				v1.x = sin(theta + pi) * r;
				v1.y = -h2;
				v1.z = cos(theta + pi) * r;
		 
				if(boolUseTexture)
				{
					PointF_t textCoord = pTxMap->GetCoord3(2, 0, j);
					G3dAddPrimVtxF(hGC, &v1, &n, &textCoord, 0);
				}
				else
				{
					G3dAddPrimVtxF(hGC, &v1, &n, 0, 0);
				}
			}
			G3dEndPrim(hGC);
		}

		G3dSetState( hGC, G3DL_FRONT_CCW, &lCCW);
		if(boolUseTexture)
		{
			pRC->SetTexture(0);							// turn off texture
			delete pTxMap;
		}
	}
#elif (defined(CH_USE_RLAB) || defined(CH_USE_D3D))
#endif //defined( CH_USE_3DR )
	return true;
}

#if (defined(CH_USE_RLAB) || defined(CH_USE_D3D))
void ChQvCylinderInstance::SetTextureCoordinates(ChQvCylinderTextures *pTxMap, ChNrMesh mesh, ChNrFace face, Parts part, int facet)
{
	int count = ChNrFaceGetVertexCount(face);
	for(int j = 0; j < count; j++)
	{
		GxVec3f textCoord = pTxMap->GetCoord3(part, facet, j);
		int index = ChNrFaceGetVertexIndex(face, j);
		ChNrMeshSetTextureCoordinates(mesh, index, textCoord.x(), textCoord.y());
	}
}
#endif

ChQvIFSInstance::ChQvIFSInstance() : ChQvShapeInstance()
{
}

#define ALMOST_ZERO	(1.e-12)

bool ChQvIFSInstance::IsConvex(int iFirstVertex, int iNumVerts)
{
	QvIndexedFaceSet *pNode = (QvIndexedFaceSet *)GetNode();

	// If they claim convex, believe 'em
	if(GetShapeHints()->faceType.value == QvShapeHints::CONVEX) return true;

	QvCoordinate3 *pC3 = GetCoordinate3();
	int j;
	GxVec3f n;
	 
	long *pCoords = pNode->coordIndex.values + iFirstVertex;

	// First pass - find a non-degenerate normal
	for(j = 0; j < iNumVerts; j++)
	{
		int iC3 = pCoords[j] * 3;
		GxVec3f	p(pC3->point.values[iC3], pC3->point.values[iC3+1], pC3->point.values[iC3+2]);
		int iCv = pCoords[(j+1) % iNumVerts] * 3;
		GxVec3f	v1(pC3->point.values[iCv], pC3->point.values[iCv+1], pC3->point.values[iCv+2]);
		iCv = pCoords[(j+2) % iNumVerts] * 3;
		GxVec3f	v2(pC3->point.values[iCv], pC3->point.values[iCv+1], pC3->point.values[iCv+2]);

		v1 -= p;
		v2 -= p;

		n = v1.cross(v2);
		if(n.magnitude() > ALMOST_ZERO) break;
	}

	GxVec3f nRef = n;

	// Second pass - test against non-degenerate reference normal 
	for(j = 0; j < iNumVerts; j++)
	{
		int iC3 = pCoords[j] * 3;
		GxVec3f	p(pC3->point.values[iC3], pC3->point.values[iC3+1], pC3->point.values[iC3+2]);
		int iCv = pCoords[(j+1) % iNumVerts] * 3;
		GxVec3f	v1(pC3->point.values[iCv], pC3->point.values[iCv+1], pC3->point.values[iCv+2]);
		iCv = pCoords[(j+2) % iNumVerts] * 3;
		GxVec3f	v2(pC3->point.values[iCv], pC3->point.values[iCv+1], pC3->point.values[iCv+2]);

		v1 -= p;
		v2 -= p;

		n = v1.cross(v2);
		if(n.dot(nRef) < 0.0) return false;
	}
	return true;	// TODO
};

bool ChQvIFSInstance::Construct(ChRenderContext *pRC, ChConstructionIterator *pIterator)
{
#if (defined(CH_USE_RLAB) || defined(CH_USE_D3D))
	{
		ASSERT(m_frame );
		pRC->LockQv();		   // Lock tree so other threads don't kill our data
		if(!pIterator->IsOKToProceed(this))	 // This locks scene if available
		{
			pRC->UnlockQv();		   // Unlock tree 
			return 0;
		}
		if(IsConstructed())
		{
			pRC->UnlockQv();		   // Lock tree so other threads don't kill our data
			pRC->UnlockScene();
			return 1;
		}
		//TRACE("Constructing an IFS\n");
		m_boolConstructed = true;

		QvIndexedFaceSet *pNode = (QvIndexedFaceSet *)GetNode();

		// Interpret shapehints; we assume there is at least one there; (we inited to make sure)
		// Remember that RL CW is opposite from VRML (LHS ~ RHS)
		bool boolCCW = (GetShapeHints()->vertexOrdering.value == QvShapeHints::COUNTERCLOCKWISE);
		bool boolDirectionKnown = !(GetShapeHints()->vertexOrdering.value == QvShapeHints::UNKNOWN_ORDERING);
		
		bool boolFlipNormals = false;	// ????????

		// Figure out if we can backcull. solid + known order means we can
		bool boolBackCull = ((GetShapeHints()->vertexOrdering.value != QvShapeHints::UNKNOWN_ORDERING) &&
					(GetShapeHints()->shapeType.value == QvShapeHints::SOLID));
	

									/* If they can't write good nodes, don't draw them! */				 
		if(((ChQvIFSRenderData *)m_pRenderData)->IsValid())
		{
		
			ChQvIndexedFaceSetNormals *pNormals = ((ChQvIFSRenderData *)m_pRenderData)->GetNormals();

 			// Make a material mapping; we will use later for each face
			ChQvFaceSetMaterials materialMap( this );
			pRC->AdjustTransparency(materialMap);

			int j;			// multiuse counter

			/* Get the texture map, */
			ChQvIFSTextures	*pTxMap  = new ChQvIFSTextures( this );	
			ChQvTextureRenderData *pTextureData = (ChQvTextureRenderData*)(GetTexture2()->GetRenderData());
			bool boolUseTexture = !(pTextureData->IsEmpty());  // one -might- arrive

			// Get the vertices
			QvCoordinate3 *pC3 = GetCoordinate3();

			ChNrMesh mesh = m_mesh = pRC->CreateMesh();
			ChNrFrameAddVisual(GetFrame(), mesh);
			D3DRelease(mesh);

			ChNrObjectSetAppData(mesh, (unsigned long)this);
			ChNrMeshSetPerspective(mesh,true);

			QvMaterialBinding::Binding	binding = (QvMaterialBinding::Binding)(GetMaterialBinding()->value.value);
			bool boolColorByFace = !(binding == QvMaterialBinding::PER_VERTEX || 
									binding == QvMaterialBinding::PER_VERTEX_INDEXED);

			ChNrMeshSetColorSource(mesh, boolColorByFace ? ColorFromFace : ColorFromVertex);
			 
			// Need to reserve space for vertices, normals, and faces -  ????
			int numFaces = GetFaceCount(pNode->coordIndex.values, pNode->coordIndex.num);

			// Allocate vertex and normal arrays, at least as big as we need
			int normSize = pNode->coordIndex.num;
			if(!boolBackCull) normSize *= 2;
			GxVec3f *pN = new GxVec3f[normSize];	  
			GxVec3f *pV = new GxVec3f[pNode->coordIndex.num];

			// Allocate the index arrays, to reuse as much as possible
			int * faceNorms = new int[numFaces];
			int * uniqueNorms = new int[pNode->coordIndex.num];	 // indexed by coord #
			int * sharedNorms = new int[pC3->point.num];	 //  indexed by coordIndex[j]
			int * verts = new int[pC3->point.num];	    
			int * texIndices = new int[pC3->point.num];	    	// parallel to verts
			int * texVerts = new int[pNode->coordIndex.num];	 // indexed by coord #

			for( j = 0; j< pNode->coordIndex.num; j++)
			{  
				uniqueNorms[j] = -1;	  // -1 unused
			}
			for( j = 0; j< pC3->point.num; j++)
			{  
				sharedNorms[j] = verts[j] = -1;	  // -1 unused
			}
			for( j = 0; j< numFaces; j++)
			{  
				faceNorms[j] =  -1;	  // -1 unused
			}

			// Get the coordinates; add all the vertices and normals to the mesh, and index them

			// Counters into faces, pN and pV	  
			int numN = 0;		// pN
			int	numV = 0;		// pV
			int	iface = 0;		 // current face
			int ifd = 0;		 // Index to Face Data

			int face_data_size = pNode->coordIndex.num * 2		// for faces' vertices 
								+ numFaces 				// face counts
								+ 1;					// terminator
			if(!boolBackCull) face_data_size *= 2;

			// As a worst case, we could get a triangle for almost
			// every point. To be conservative, we assume this and get 
			// lots of space for face_data
			face_data_size *= 4;		// actually need 7 ints for each triangle, instead of 2

			ChNrFaceData * face_data = new ChNrFaceData[face_data_size];