BGE: Fix T38030: wrong vertex index returned by KX_PolyProxy

Fix T38030.
In c++ source we use one list for triangles and an other for quads, but KX_PolyProxy doesn't care about that and return the vertex offset in its list. So we just have to compute the offset of each RAS_DisplayArray to its previous to have an absolute vertex index.

Reviewers: moguri, campbellbarton, kupoman, agoose77, brita_, hg1

Reviewed By: agoose77, hg1

Projects: #game_engine

Maniphest Tasks: T38030

Differential Revision: https://developer.blender.org/D1324

source/gameengine/Ketsji/KX_PolyProxy.cpp

@@ -140,21 +140,21 @@ PyObject *KX_PolyProxy::pyattr_get_v1(void *self_v, const KX_PYATTRIBUTE_DEF *at
 {
 	KX_PolyProxy* self = static_cast<KX_PolyProxy*>(self_v);
 
-	return PyLong_FromLong(self->m_polygon->GetVertexOffset(0));
+	return PyLong_FromLong(self->m_polygon->GetVertexOffsetAbsolute(0));
 }
 
 PyObject *KX_PolyProxy::pyattr_get_v2(void *self_v, const KX_PYATTRIBUTE_DEF *attrdef)
 {
 	KX_PolyProxy* self = static_cast<KX_PolyProxy*>(self_v);
 
-	return PyLong_FromLong(self->m_polygon->GetVertexOffset(1));
+	return PyLong_FromLong(self->m_polygon->GetVertexOffsetAbsolute(1));
 }
 
 PyObject *KX_PolyProxy::pyattr_get_v3(void *self_v, const KX_PYATTRIBUTE_DEF *attrdef)
 {
 	KX_PolyProxy* self = static_cast<KX_PolyProxy*>(self_v);
 
-	return PyLong_FromLong(self->m_polygon->GetVertexOffset(2));
+	return PyLong_FromLong(self->m_polygon->GetVertexOffsetAbsolute(2));
 }
 
 PyObject *KX_PolyProxy::pyattr_get_v4(void *self_v, const KX_PYATTRIBUTE_DEF *attrdef)
@@ -163,7 +163,7 @@ PyObject *KX_PolyProxy::pyattr_get_v4(void *self_v, const KX_PYATTRIBUTE_DEF *at
 
 	if (3 < self->m_polygon->VertexCount())
 	{
-		return PyLong_FromLong(self->m_polygon->GetVertexOffset(3));
+		return PyLong_FromLong(self->m_polygon->GetVertexOffsetAbsolute(3));
 	}
 	return PyLong_FromLong(0);
 }
@@ -243,7 +243,7 @@ KX_PYMETHODDEF_DOC(KX_PolyProxy, getVertexIndex,
 	}
 	if (index < m_polygon->VertexCount())
 	{
-		return PyLong_FromLong(m_polygon->GetVertexOffset(index));
+		return PyLong_FromLong(m_polygon->GetVertexOffsetAbsolute(index));
 	}
 	return PyLong_FromLong(0);
 }

source/gameengine/Rasterizer/RAS_MaterialBucket.cpp

@@ -287,6 +287,16 @@ void RAS_MeshSlot::AddPolygonVertex(int offset)
 		m_endindex++;
 }
 
+void RAS_MeshSlot::UpdateDisplayArraysOffset()
+{
+	unsigned int offset = 0;
+	for (unsigned short i = 0; i < m_displayArrays.size(); ++i) {
+		RAS_DisplayArray *darray = m_displayArrays[i];
+		darray->m_offset = offset;
+		offset += darray->m_vertex.size();
+	}
+}
+
 void RAS_MeshSlot::SetDeformer(RAS_Deformer* deformer)
 {
 	if (deformer && m_pDeformer != deformer) {

source/gameengine/Rasterizer/RAS_MaterialBucket.h

@@ -80,6 +80,13 @@ public:
 class RAS_DisplayArray
 {
 public:
+	/** The offset relation to the previous RAS_DisplayArray.
+	 * For the user vertex are one big list but in C++ source
+	 * it's two different lists if we use quads and triangles.
+	 * So to fix that we add an offset.
+	 * This value is set in UpdateDisplayArraysOffset().
+	 */
+	unsigned int m_offset;
 	vector<RAS_TexVert> m_vertex;
 	vector<unsigned short> m_index;
 	/* LINE currently isn't used */
@@ -165,6 +172,9 @@ public:
 	int AddVertex(const RAS_TexVert& tv);
 	void AddPolygonVertex(int offset);
 
+	/// Update offset of each display array
+	void UpdateDisplayArraysOffset();
+
 	/* optimization */
 	bool Split(bool force=false);
 	bool Join(RAS_MeshSlot *target, MT_Scalar distance);

source/gameengine/Rasterizer/RAS_MeshObject.cpp

@@ -465,6 +465,23 @@ void RAS_MeshObject::RemoveFromBuckets(void *clientobj)
 	}
 }
 
+void RAS_MeshObject::EndConversion()
+{
+#if 0
+	m_sharedvertex_map.clear(); // SharedVertex
+	vector<vector<SharedVertex> >	shared_null(0);
+	shared_null.swap( m_sharedvertex_map ); /* really free the memory */
+#endif
+
+	for (std::list<RAS_MeshMaterial>::iterator it = m_materials.begin();
+		 it != m_materials.end();
+		 ++it)
+	{
+		RAS_MeshSlot *ms = it->m_baseslot;
+		ms->UpdateDisplayArraysOffset();
+	}
+}
+
 //void RAS_MeshObject::Transform(const MT_Transform& trans)
 //{
 	//m_trans.translate(MT_Vector3(0,0,1));//.operator *=(trans);

source/gameengine/Rasterizer/RAS_MeshObject.h

@@ -132,13 +132,7 @@ public:
 	virtual void		AddMeshUser(void *clientobj, SG_QList *head, RAS_Deformer* deformer);
 
 	void				RemoveFromBuckets(void *clientobj);
-	void				EndConversion() {
-#if 0
-		m_sharedvertex_map.clear(); // SharedVertex
-		vector<vector<SharedVertex> >	shared_null(0);
-		shared_null.swap( m_sharedvertex_map ); /* really free the memory */
-#endif
-	}
+	void				EndConversion();
 
 	/* colors */
 	void				DebugColor(unsigned int abgr);

source/gameengine/Rasterizer/RAS_Polygon.cpp

@@ -62,9 +62,9 @@ RAS_TexVert *RAS_Polygon::GetVertex(int i)
 	return &m_darray->m_vertex[m_offset[i]];
 }
 
-int RAS_Polygon::GetVertexOffset(int i)
+unsigned int RAS_Polygon::GetVertexOffsetAbsolute(unsigned short i)
 {
-	return m_offset[i];
+	return m_offset[i] + m_darray->m_offset;
 }
 
 /*

source/gameengine/Rasterizer/RAS_Polygon.h

@@ -72,8 +72,8 @@ public:
 	RAS_TexVert*		GetVertex(int i);
 
 	void				SetVertexOffset(int i, unsigned short offset);
-	int					GetVertexOffset(int i);
-	
+	unsigned int		GetVertexOffsetAbsolute(unsigned short i);
+
 	// each bit is for a visible edge, starting with bit 1 for the first edge, bit 2 for second etc.
 	// - Not used yet!
 /*	int					GetEdgeCode();