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CryAnimation/CrySkinBuilderBase.cpp

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+#include "stdafx.h"
+#include "CrySkinBuilderBase.h"
+
+CrySkinBuilderBase::CrySkinBuilderBase(const ICrySkinSource* pGeometry):
+	CrySkinBuilderBase0 (pGeometry)
+#ifdef DEBUG_STD_CONTAINERS
+	,m_arrBoneVerts ("CrySkinBuilder.arrBoneVerts")
+#endif
+{
+	preprocess();
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+// fills in the group of aux ints for the given bone (the rigid vertex group)
+// returns the pointer to the next available auxint after the group
+// IMPLEMENTATION NOTE:
+//  actually, the rigid group is empty in the auxiliary stream, so we just set the number of vertices
+void CrySkinBuilderBase::fillRigidGroup (CrySkinStreams& streams, unsigned nBone)
+{
+	CrySkinRigidVertexArray& arrRigid = m_arrBoneVerts[nBone].arrRigid;
+
+	// the group starts with the number of rigid vertices belonging to this bone
+	*streams.pAux++ = (CrySkinAuxInt)arrRigid.size();
+
+	CrySkinRigidVertexArray::const_iterator it = arrRigid.begin(), itEnd = it + arrRigid.size();
+
+  for (; it != itEnd; ++it)
+		it->build (*streams.pVert++);
+}
+
+//////////////////////////////////////////////////////////////////////////
+// computes the max number of bone affecting a vertex + 1
+// and the total number of links to smooth vertices - the sum of numbers of links of all smooth vertices
+// the total number of links per all vertices. If the whole object is rigid,
+// this is the same as the number of vertices
+void CrySkinBuilderBase::preprocess()
+{
+	// we need for each bone:
+	// Vert:
+	//  RigidVertex for each rigid vertex, and SmoothVertex for each smooth vertex
+	// Aux:
+	//  3 counts of vertices in each group
+	//  index of target for each smooth vertex
+
+	m_numBones = 0;
+	m_numSmoothLinks = 0;
+	m_numLinks = 0;
+	unsigned numVertices = m_pGeometry->numVertices();
+	for (unsigned nVert = 0; nVert < numVertices; ++nVert)
+	{
+		// the number of links for this vertex
+		unsigned numVertexLinks = (unsigned)m_pGeometry->getLink(nVert).size();
+		if (numVertexLinks > 1)
+			// if the vertex is smooth, we'll need to keep the weights and destination indices
+			m_numSmoothLinks += numVertexLinks;
+
+		m_numBones = max(m_pGeometry->getLink(nVert).maxBoneID(), m_numBones);
+		
+		m_numLinks += numVertexLinks;
+	}
+	++m_numBones;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+// calculates the vertex list of each bone
+void CrySkinBuilderBase::makeFullBoneVertexArrays()
+{
+	m_arrBoneVerts.clear();
+	m_arrBoneVerts.resize (m_numBones);
+
+	unsigned numVertices = m_pGeometry->numVertices();
+	// preallocate memory for the vertices in bones
+	for (unsigned i = 0; i < m_numBones; ++i)
+		// assume approximately uniform distribution
+		m_arrBoneVerts[i].reserve (numVertices / m_numBones);
+
+	for (unsigned nVert = 0; nVert < numVertices; ++nVert)
+	{
+		// the number of links for this vertex
+		const CryVertexBinding& rLinks = m_pGeometry->getLink (nVert);
+		if (rLinks.size() == 1)
+			m_arrBoneVerts[rLinks[0].BoneID].arrRigid.push_back(CrySkinRigidVertex (rLinks[0].offset, nVert));
+		else
+		for (unsigned i = 0; i < rLinks.size(); ++i)
+		{
+			m_arrBoneVerts[rLinks[i].BoneID].arrSmooth.push_back(CrySkinSmoothVertex (rLinks[i], nVert));
+		}
+	}
+}