/**
* Creates a FStaticMeshRenderData from a D3DXMesh
* @param DestMesh Destination mesh to extract to
* @param NumUVs Number of UVs
* @param Elements Elements array
* @return Boolean representing success or failure
*/
bool ConvertD3DXMeshToRawMesh(
TRefCountPtr<ID3DXMesh>& D3DMesh,
FRawMesh& DestMesh,
int32 NumUVs
)
{
// Extract simplified data to LOD
FUtilVertex* D3DVertices;
uint16* D3DIndices;
::DWORD * D3DAttributes;
D3DMesh->LockVertexBuffer(D3DLOCK_READONLY,(LPVOID*)&D3DVertices);
D3DMesh->LockIndexBuffer(D3DLOCK_READONLY,(LPVOID*)&D3DIndices);
D3DMesh->LockAttributeBuffer(D3DLOCK_READONLY,&D3DAttributes);
int32 NumFaces = D3DMesh->GetNumFaces();
int32 NumWedges = NumFaces * 3;
DestMesh.FaceMaterialIndices.Init(NumFaces);
DestMesh.FaceSmoothingMasks.Init(NumFaces);
DestMesh.VertexPositions.Init(NumWedges);
DestMesh.WedgeIndices.Init(NumWedges);
DestMesh.WedgeColors.Init(NumWedges);
DestMesh.WedgeTangentX.Init(NumWedges);
DestMesh.WedgeTangentY.Init(NumWedges);
DestMesh.WedgeTangentZ.Init(NumWedges);
for (int32 UVIndex = 0; UVIndex < NumUVs; ++UVIndex)
{
DestMesh.WedgeTexCoords[UVIndex].Init(NumWedges);
}
for(int32 I=0;I<NumFaces;I++)
{
// Copy smoothing mask and index from any vertex into this triangle
DestMesh.FaceSmoothingMasks[I] = D3DVertices[D3DIndices[I*3+0]].SmoothingMask;
DestMesh.FaceMaterialIndices[I] = D3DAttributes[I];
for(int UVs=0;UVs<NumUVs;UVs++)
{
DestMesh.WedgeTexCoords[UVs][I*3+0] = D3DVertices[D3DIndices[I*3+0]].UVs[UVs];
DestMesh.WedgeTexCoords[UVs][I*3+1] = D3DVertices[D3DIndices[I*3+1]].UVs[UVs];
DestMesh.WedgeTexCoords[UVs][I*3+2] = D3DVertices[D3DIndices[I*3+2]].UVs[UVs];
}
for(int32 K=0;K<3;K++)
{
DestMesh.WedgeIndices[I*3+K] = I*3+K;
DestMesh.VertexPositions[I*3+K] = D3DVertices[D3DIndices[I*3+K]].Position;
DestMesh.WedgeColors[I*3+K] = D3DVertices[D3DIndices[I*3+K]].Color;
DestMesh.WedgeTangentX[I*3+K] = D3DVertices[D3DIndices[I*3+K]].TangentX;
DestMesh.WedgeTangentY[I*3+K] = D3DVertices[D3DIndices[I*3+K]].TangentY;
DestMesh.WedgeTangentZ[I*3+K] = D3DVertices[D3DIndices[I*3+K]].TangentZ;
}
}
D3DMesh->UnlockIndexBuffer();
D3DMesh->UnlockVertexBuffer();
D3DMesh->UnlockAttributeBuffer();
return true;
}
/** Merges a set of D3DXMeshes. */
static void MergeD3DXMeshes(
IDirect3DDevice9* Device,
TRefCountPtr<ID3DXMesh>& OutMesh,TArray<int32>& OutBaseFaceIndex,const TArray<ID3DXMesh*>& Meshes)
{
TArray<D3DVERTEXELEMENT9> VertexElements;
GetD3D9MeshVertexDeclarations(VertexElements);
// Count the number of faces and vertices in the input meshes.
int32 NumFaces = 0;
int32 NumVertices = 0;
for(int32 MeshIndex = 0;MeshIndex < Meshes.Num();MeshIndex++)
{
NumFaces += Meshes[MeshIndex]->GetNumFaces();
NumVertices += Meshes[MeshIndex]->GetNumVertices();
}
// Create mesh for source data
VERIFYD3D9RESULT(D3DXCreateMesh(
NumFaces,
NumVertices,
D3DXMESH_SYSTEMMEM,
(D3DVERTEXELEMENT9*)VertexElements.GetData(),
Device,
OutMesh.GetInitReference()
) );
// Fill D3DXMesh
FUtilVertex* ResultVertices;
uint16* ResultIndices;
::DWORD * ResultAttributes;
OutMesh->LockVertexBuffer(0,(LPVOID*)&ResultVertices);
OutMesh->LockIndexBuffer(0,(LPVOID*)&ResultIndices);
OutMesh->LockAttributeBuffer(0, &ResultAttributes);
int32 BaseVertexIndex = 0;
int32 BaseFaceIndex = 0;
for(int32 MeshIndex = 0;MeshIndex < Meshes.Num();MeshIndex++)
{
ID3DXMesh* Mesh = Meshes[MeshIndex];
FUtilVertex* Vertices;
uint16* Indices;
::DWORD * Attributes;
Mesh->LockVertexBuffer(0,(LPVOID*)&Vertices);
Mesh->LockIndexBuffer(0,(LPVOID*)&Indices);
Mesh->LockAttributeBuffer(0, &Attributes);
for(uint32 FaceIndex = 0;FaceIndex < Mesh->GetNumFaces();FaceIndex++)
{
for(uint32 VertexIndex = 0;VertexIndex < 3;VertexIndex++)
{
*ResultIndices++ = BaseVertexIndex + *Indices++;
}
}
OutBaseFaceIndex.Add(BaseFaceIndex);
BaseFaceIndex += Mesh->GetNumFaces();
FMemory::Memcpy(ResultVertices,Vertices,Mesh->GetNumVertices() * sizeof(FUtilVertex));
ResultVertices += Mesh->GetNumVertices();
BaseVertexIndex += Mesh->GetNumVertices();
FMemory::Memcpy(ResultAttributes,Attributes,Mesh->GetNumFaces() * sizeof(uint32));
ResultAttributes += Mesh->GetNumFaces();
Mesh->UnlockIndexBuffer();
Mesh->UnlockVertexBuffer();
Mesh->UnlockAttributeBuffer();
}
OutMesh->UnlockIndexBuffer();
OutMesh->UnlockVertexBuffer();
OutMesh->UnlockAttributeBuffer();
}
/**
* Creates a D3DXMESH from a FStaticMeshRenderData
* @param Triangles The triangles to create the mesh from.
* @param bRemoveDegenerateTriangles True if degenerate triangles should be removed
* @param OutD3DMesh Mesh to create
* @return Boolean representing success or failure
*/
bool ConvertRawMeshToD3DXMesh(
IDirect3DDevice9* Device,
FRawMesh& RawMesh,
const bool bRemoveDegenerateTriangles,
TRefCountPtr<ID3DXMesh>& OutD3DMesh
)
{
TArray<D3DVERTEXELEMENT9> VertexElements;
GetD3D9MeshVertexDeclarations(VertexElements);
TArray<FUtilVertex> Vertices;
TArray<uint16> Indices;
TArray<uint32> Attributes;
int32 NumWedges = RawMesh.WedgeIndices.Num();
int32 NumTriangles = NumWedges / 3;
int32 NumUVs = 0;
for (; NumUVs < 8; ++NumUVs)
{
if (RawMesh.WedgeTexCoords[NumUVs].Num() != RawMesh.WedgeIndices.Num())
{
break;
}
}
bool bHaveColors = RawMesh.WedgeColors.Num() == NumWedges;
bool bHaveNormals = RawMesh.WedgeTangentZ.Num() == NumWedges;
bool bHaveTangents = bHaveNormals && RawMesh.WedgeTangentX.Num() == NumWedges
&& RawMesh.WedgeTangentY.Num() == NumWedges;
for(int32 TriangleIndex = 0;TriangleIndex < NumTriangles;TriangleIndex++)
{
bool bTriangleIsDegenerate = false;
if( bRemoveDegenerateTriangles )
{
// Detect if the triangle is degenerate.
for(int32 EdgeIndex = 0;EdgeIndex < 3;EdgeIndex++)
{
const int32 Wedge0 = TriangleIndex * 3 + EdgeIndex;
const int32 Wedge1 = TriangleIndex * 3 + ((EdgeIndex + 1) % 3);
if((RawMesh.GetWedgePosition(Wedge0) - RawMesh.GetWedgePosition(Wedge1)).IsNearlyZero(THRESH_POINTS_ARE_SAME * 4.0f))
{
bTriangleIsDegenerate = true;
break;
}
}
}
if(!bTriangleIsDegenerate)
{
Attributes.Add(RawMesh.FaceMaterialIndices[TriangleIndex]);
for(int32 J=0;J<3;J++)
{
FUtilVertex* Vertex = new(Vertices) FUtilVertex;
FMemory::Memzero(Vertex,sizeof(FUtilVertex));
int32 WedgeIndex = TriangleIndex * 3 + J;
Vertex->Position = RawMesh.GetWedgePosition(WedgeIndex);
if (bHaveColors)
{
Vertex->Color = RawMesh.WedgeColors[WedgeIndex];
}
else
{
Vertex->Color = FColor::White;
}
//store the smoothing mask per vertex since there is only one per-face attribute that is already being used (materialIndex)
Vertex->SmoothingMask = RawMesh.FaceSmoothingMasks[TriangleIndex];
if (bHaveTangents)
{
Vertex->TangentX = RawMesh.WedgeTangentX[WedgeIndex];
Vertex->TangentY = RawMesh.WedgeTangentY[WedgeIndex];
}
if (bHaveNormals)
{
Vertex->TangentZ = RawMesh.WedgeTangentZ[WedgeIndex];
}
for(int32 UVIndex = 0; UVIndex < NumUVs; UVIndex++)
{
Vertex->UVs[UVIndex] = RawMesh.WedgeTexCoords[UVIndex][WedgeIndex];
}
Indices.Add(Vertices.Num() - 1);
}
}
}
// This code uses the raw triangles. Needs welding, etc.
const int32 NumFaces = Indices.Num() / 3;
const int32 NumVertices = NumFaces*3;
check(Attributes.Num() == NumFaces);
check(NumFaces * 3 == Indices.Num());
// Create mesh for source data
if (FAILED(D3DXCreateMesh(NumFaces,NumVertices,D3DXMESH_SYSTEMMEM,(D3DVERTEXELEMENT9 *)VertexElements.GetData(),Device,OutD3DMesh.GetInitReference()) ) )
{
UE_LOG(LogD3D9MeshUtils, Warning, TEXT("D3DXCreateMesh() Failed!"));
return false;
}
// Fill D3DMesh mesh
FUtilVertex* D3DVertices;
uint16* D3DIndices;
::DWORD * D3DAttributes;
OutD3DMesh->LockVertexBuffer(0,(LPVOID*)&D3DVertices);
OutD3DMesh->LockIndexBuffer(0,(LPVOID*)&D3DIndices);
OutD3DMesh->LockAttributeBuffer(0, &D3DAttributes);
FMemory::Memcpy(D3DVertices,Vertices.GetTypedData(),Vertices.Num() * sizeof(FUtilVertex));
FMemory::Memcpy(D3DIndices,Indices.GetTypedData(),Indices.Num() * sizeof(uint16));
FMemory::Memcpy(D3DAttributes,Attributes.GetTypedData(),Attributes.Num() * sizeof(uint32));
OutD3DMesh->UnlockIndexBuffer();
OutD3DMesh->UnlockVertexBuffer();
OutD3DMesh->UnlockAttributeBuffer();
return true;
}