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Copy pathDirectXMeshRemap.cpp
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940 lines (748 loc) · 25.2 KB
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//-------------------------------------------------------------------------------------
// DirectXMeshRemap.cpp
//
// DirectX Mesh Geometry Library - Remap functions for applying face/vertex mappings
//
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
//
// http://go.microsoft.com/fwlink/?LinkID=324981
//-------------------------------------------------------------------------------------
#include "DirectXMeshP.h"
using namespace DirectX;
namespace
{
constexpr size_t c_MaxStride = 2048;
#if defined(__d3d11_h__) || defined(__d3d11_x_h__)
static_assert(c_MaxStride == D3D11_REQ_MULTI_ELEMENT_STRUCTURE_SIZE_IN_BYTES, "D3D11 mismatch");
#endif
#if defined(__d3d12_h__) || defined(__d3d12_x_h__) || defined(__XBOX_D3D12_X__)
static_assert(c_MaxStride == D3D12_REQ_MULTI_ELEMENT_STRUCTURE_SIZE_IN_BYTES, "D3D12 mismatch");
#endif
//---------------------------------------------------------------------------------
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning( disable : 6101 )
#endif
template<class index_t>
HRESULT ReorderFaces(
_In_reads_(nFaces * 3) const index_t* ibin, _In_ size_t nFaces,
_In_reads_opt_(nFaces * 3) const uint32_t* adjin,
_In_reads_(nFaces) const uint32_t* faceRemap,
_Out_writes_(nFaces * 3) index_t* ibout,
_Out_writes_opt_(nFaces * 3) uint32_t* adjout) noexcept
{
assert(ibin != nullptr && faceRemap != nullptr && ibout != nullptr && ibin != ibout);
_Analysis_assume_(ibin != nullptr && faceRemap != nullptr && ibout != nullptr && ibin != ibout);
assert((!adjin && !adjout) || ((adjin && adjout) && adjin != adjout));
_Analysis_assume_((!adjin && !adjout) || ((adjin && adjout) && adjin != adjout));
for (size_t j = 0; j < nFaces; ++j)
{
const uint32_t src = faceRemap[j];
if (src == UNUSED32)
continue;
if (src < nFaces)
{
ibout[j * 3] = ibin[src * 3];
ibout[j * 3 + 1] = ibin[src * 3 + 1];
ibout[j * 3 + 2] = ibin[src * 3 + 2];
if (adjin && adjout)
{
adjout[j * 3] = adjin[src * 3];
adjout[j * 3 + 1] = adjin[src * 3 + 1];
adjout[j * 3 + 2] = adjin[src * 3 + 2];
}
}
else
return E_FAIL;
}
return S_OK;
}
#ifdef _MSC_VER
#pragma warning(pop)
#endif
//---------------------------------------------------------------------------------
template<class index_t>
HRESULT SwapFaces(
_Inout_updates_all_(nFaces * 3) index_t* ib, _In_ size_t nFaces,
_Inout_updates_all_opt_(nFaces * 3) uint32_t* adj,
_In_reads_(nFaces) const uint32_t* faceRemap) noexcept
{
assert(ib != nullptr && faceRemap != nullptr);
_Analysis_assume_(ib != nullptr && faceRemap != nullptr);
std::unique_ptr<uint8_t[]> temp(new (std::nothrow) uint8_t[(sizeof(bool) + sizeof(uint32_t)) * nFaces]);
if (!temp)
return E_OUTOFMEMORY;
auto faceRemapInverse = reinterpret_cast<uint32_t*>(temp.get());
memset(faceRemapInverse, 0xff, sizeof(uint32_t) * nFaces);
for (uint32_t j = 0; j < nFaces; ++j)
{
if (faceRemap[j] != UNUSED32)
{
if (faceRemap[j] >= nFaces)
return E_UNEXPECTED;
faceRemapInverse[faceRemap[j]] = j;
}
}
auto moved = reinterpret_cast<bool*>(temp.get() + sizeof(uint32_t) * nFaces);
memset(moved, 0, sizeof(bool) * nFaces);
for (size_t j = 0; j < nFaces; ++j)
{
if (moved[j])
continue;
uint32_t dest = faceRemapInverse[j];
if (dest == UNUSED32)
continue;
if (dest >= nFaces)
return E_FAIL;
while (dest != j)
{
// Swap face
index_t i0 = ib[dest * 3];
index_t i1 = ib[dest * 3 + 1];
index_t i2 = ib[dest * 3 + 2];
ib[dest * 3] = ib[j * 3];
ib[dest * 3 + 1] = ib[j * 3 + 1];
ib[dest * 3 + 2] = ib[j * 3 + 2];
ib[j * 3] = i0;
ib[j * 3 + 1] = i1;
ib[j * 3 + 2] = i2;
if (adj)
{
const uint32_t a0 = adj[dest * 3];
const uint32_t a1 = adj[dest * 3 + 1];
const uint32_t a2 = adj[dest * 3 + 2];
adj[dest * 3] = adj[j * 3];
adj[dest * 3 + 1] = adj[j * 3 + 1];
adj[dest * 3 + 2] = adj[j * 3 + 2];
adj[j * 3] = a0;
adj[j * 3 + 1] = a1;
adj[j * 3 + 2] = a2;
}
moved[dest] = true;
dest = faceRemapInverse[dest];
if (dest == UNUSED32 || moved[dest])
break;
if (dest >= nFaces)
return E_FAIL;
}
}
return S_OK;
}
//---------------------------------------------------------------------------------
HRESULT SwapVertices(
_Inout_updates_bytes_all_(nVerts*stride) void* vb, size_t stride, size_t nVerts,
_Inout_updates_all_opt_(nVerts) uint32_t* pointRep, _In_reads_(nVerts) const uint32_t* vertexRemap) noexcept
{
if (!vb || !stride || !nVerts || !vertexRemap)
return E_INVALIDARG;
if (stride > c_MaxStride)
return E_INVALIDARG;
std::unique_ptr<uint8_t[]> temp(new (std::nothrow) uint8_t[((sizeof(bool) + sizeof(uint32_t)) * nVerts) + stride]);
if (!temp)
return E_OUTOFMEMORY;
auto vertexRemapInverse = reinterpret_cast<uint32_t*>(temp.get());
memset(vertexRemapInverse, 0xff, sizeof(uint32_t) * nVerts);
for (uint32_t j = 0; j < nVerts; ++j)
{
if (vertexRemap[j] != UNUSED32)
{
if (vertexRemap[j] >= nVerts)
return E_UNEXPECTED;
vertexRemapInverse[vertexRemap[j]] = j;
}
}
auto moved = reinterpret_cast<bool*>(temp.get() + sizeof(uint32_t) * nVerts);
memset(moved, 0, sizeof(bool) * nVerts);
auto vbtemp = temp.get() + ((sizeof(bool) + sizeof(uint32_t)) * nVerts);
auto ptr = static_cast<uint8_t*>(vb);
for (size_t j = 0; j < nVerts; ++j)
{
if (moved[j])
continue;
uint32_t dest = vertexRemapInverse[j];
if (dest == UNUSED32)
continue;
if (dest >= nVerts)
return E_UNEXPECTED;
bool next = false;
while (dest != j)
{
// Swap vertex
#ifdef _PREFAST_
#pragma prefast(push)
#pragma prefast(disable : 26019, "PREfast noise: Esp:1307")
#endif
memcpy(vbtemp, ptr + dest*stride, stride);
memcpy(ptr + dest*stride, ptr + j*stride, stride);
memcpy(ptr + j*stride, vbtemp, stride);
#ifdef _PREFAST_
#pragma prefast(pop)
#endif
if (pointRep)
{
std::swap(pointRep[dest], pointRep[j]);
// Remap
const uint32_t pr = pointRep[dest];
if (pr < nVerts)
{
pointRep[dest] = vertexRemapInverse[pr];
}
}
moved[dest] = true;
dest = vertexRemapInverse[dest];
if (dest == UNUSED32 || moved[dest])
{
next = true;
break;
}
if (dest >= nVerts)
return E_FAIL;
}
if (next)
continue;
if (pointRep)
{
// Remap
const uint32_t pr = pointRep[j];
if (pr < nVerts)
{
pointRep[j] = vertexRemapInverse[pr];
}
}
}
return S_OK;
}
//---------------------------------------------------------------------------------
template<class index_t>
HRESULT FinalizeIBImpl(
_In_reads_(nFaces * 3) const index_t* ibin, size_t nFaces,
_In_reads_(nVerts) const uint32_t* vertexRemap, size_t nVerts,
_Out_writes_(nFaces * 3) index_t* ibout) noexcept
{
if (!ibin || !nFaces || !vertexRemap || !nVerts || !ibout)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
if (nVerts >= index_t(-1))
return E_INVALIDARG;
std::unique_ptr<uint32_t[]> vertexRemapInverse(new (std::nothrow) uint32_t[nVerts]);
if (!vertexRemapInverse)
return E_OUTOFMEMORY;
memset(vertexRemapInverse.get(), 0xff, sizeof(uint32_t) * nVerts);
for (uint32_t j = 0; j < nVerts; ++j)
{
if (vertexRemap[j] != UNUSED32)
{
if (vertexRemap[j] >= nVerts)
return E_UNEXPECTED;
vertexRemapInverse[vertexRemap[j]] = j;
}
}
for (size_t j = 0; j < (nFaces * 3); ++j)
{
index_t i = ibin[j];
if (i == index_t(-1))
{
ibout[j] = index_t(-1);
continue;
}
if (i >= nVerts)
return E_UNEXPECTED;
const uint32_t dest = vertexRemapInverse[i];
if (dest == UNUSED32)
{
ibout[j] = i;
continue;
}
if (dest < nVerts)
{
ibout[j] = index_t(dest);
}
else
return E_FAIL;
}
return S_OK;
}
//---------------------------------------------------------------------------------
template<class index_t>
HRESULT FinalizeIBImpl(
_Inout_updates_all_(nFaces * 3) index_t* ib, size_t nFaces,
_In_reads_(nVerts) const uint32_t* vertexRemap, size_t nVerts) noexcept
{
if (!ib || !nFaces || !vertexRemap || !nVerts)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
if (nVerts >= index_t(-1))
return E_INVALIDARG;
std::unique_ptr<uint32_t[]> vertexRemapInverse(new (std::nothrow) uint32_t[nVerts]);
if (!vertexRemapInverse)
return E_OUTOFMEMORY;
memset(vertexRemapInverse.get(), 0xff, sizeof(uint32_t) * nVerts);
for (uint32_t j = 0; j < nVerts; ++j)
{
if (vertexRemap[j] != UNUSED32)
{
if (vertexRemap[j] >= nVerts)
return E_UNEXPECTED;
vertexRemapInverse[vertexRemap[j]] = j;
}
}
for (size_t j = 0; j < (nFaces * 3); ++j)
{
index_t i = ib[j];
if (i == index_t(-1))
continue;
if (i >= nVerts)
return E_UNEXPECTED;
const uint32_t dest = vertexRemapInverse[i];
if (dest == UNUSED32)
continue;
if (dest < nVerts)
{
ib[j] = index_t(dest);
}
else
return E_FAIL;
}
return S_OK;
}
}
//=====================================================================================
// Entry-points
//=====================================================================================
//-------------------------------------------------------------------------------------
// Applies a face remap reordering to an index buffer
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::ReorderIB(
const uint16_t* ibin,
size_t nFaces,
const uint32_t* faceRemap,
uint16_t* ibout) noexcept
{
if (!ibin || !nFaces || !faceRemap || !ibout)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
if (ibin == ibout)
return HRESULT_E_NOT_SUPPORTED;
return ReorderFaces<uint16_t>(ibin, nFaces, nullptr, faceRemap, ibout, nullptr);
}
_Use_decl_annotations_
HRESULT DirectX::ReorderIB(
uint16_t* ib,
size_t nFaces,
const uint32_t* faceRemap) noexcept
{
if (!ib || !nFaces || !faceRemap)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
return SwapFaces<uint16_t>(ib, nFaces, nullptr, faceRemap);
}
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::ReorderIB(
const uint32_t* ibin,
size_t nFaces,
const uint32_t* faceRemap,
uint32_t* ibout) noexcept
{
if (!ibin || !nFaces || !faceRemap || !ibout)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
if (ibin == ibout)
return HRESULT_E_NOT_SUPPORTED;
return ReorderFaces<uint32_t>(ibin, nFaces, nullptr, faceRemap, ibout, nullptr);
}
_Use_decl_annotations_
HRESULT DirectX::ReorderIB(
uint32_t* ib,
size_t nFaces,
const uint32_t* faceRemap) noexcept
{
if (!ib || !nFaces || !faceRemap)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
return SwapFaces<uint32_t>(ib, nFaces, nullptr, faceRemap);
}
//-------------------------------------------------------------------------------------
// Applies a face remap reordering to an index buffer and adjacency
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::ReorderIBAndAdjacency(
const uint16_t* ibin,
size_t nFaces,
const uint32_t* adjin,
const uint32_t* faceRemap,
uint16_t* ibout,
uint32_t* adjout) noexcept
{
if (!ibin || !nFaces || !adjin || !faceRemap || !ibout || !adjout)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
if ((ibin == ibout) || (adjin == adjout))
return HRESULT_E_NOT_SUPPORTED;
return ReorderFaces<uint16_t>(ibin, nFaces, adjin, faceRemap, ibout, adjout);
}
_Use_decl_annotations_
HRESULT DirectX::ReorderIBAndAdjacency(
uint16_t* ib,
size_t nFaces,
uint32_t* adj,
const uint32_t* faceRemap) noexcept
{
if (!ib || !nFaces || !adj || !faceRemap)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
return SwapFaces<uint16_t>(ib, nFaces, adj, faceRemap);
}
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::ReorderIBAndAdjacency(
const uint32_t* ibin,
size_t nFaces,
const uint32_t* adjin,
const uint32_t* faceRemap,
uint32_t* ibout,
uint32_t* adjout) noexcept
{
if (!ibin || !nFaces || !adjin || !faceRemap || !ibout || !adjout)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
if ((ibin == ibout) || (adjin == adjout))
return HRESULT_E_NOT_SUPPORTED;
return ReorderFaces<uint32_t>(ibin, nFaces, adjin, faceRemap, ibout, adjout);
}
_Use_decl_annotations_
HRESULT DirectX::ReorderIBAndAdjacency(
uint32_t* ib,
size_t nFaces,
uint32_t* adj,
const uint32_t* faceRemap) noexcept
{
if (!ib || !nFaces || !adj || !faceRemap)
return E_INVALIDARG;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
return SwapFaces<uint32_t>(ib, nFaces, adj, faceRemap);
}
//-------------------------------------------------------------------------------------
// Applies a vertex remap, filling out a new index buffer
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::FinalizeIB(
const uint16_t* ibin,
size_t nFaces,
const uint32_t* vertexRemap,
size_t nVerts,
uint16_t* ibout) noexcept
{
return FinalizeIBImpl<uint16_t>(ibin, nFaces, vertexRemap, nVerts, ibout);
}
_Use_decl_annotations_
HRESULT DirectX::FinalizeIB(
uint16_t* ib,
size_t nFaces,
const uint32_t* vertexRemap,
size_t nVerts) noexcept
{
return FinalizeIBImpl<uint16_t>(ib, nFaces, vertexRemap, nVerts);
}
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::FinalizeIB(
const uint32_t* ibin,
size_t nFaces,
const uint32_t* vertexRemap,
size_t nVerts,
uint32_t* ibout) noexcept
{
return FinalizeIBImpl<uint32_t>(ibin, nFaces, vertexRemap, nVerts, ibout);
}
_Use_decl_annotations_
HRESULT DirectX::FinalizeIB(
uint32_t* ib,
size_t nFaces,
const uint32_t* vertexRemap,
size_t nVerts) noexcept
{
return FinalizeIBImpl<uint32_t>(ib, nFaces, vertexRemap, nVerts);
}
//-------------------------------------------------------------------------------------
// Applies a vertex remap and/or a vertex duplication set to a vertex buffer
//-------------------------------------------------------------------------------------
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning( disable : 6101 )
#endif
_Use_decl_annotations_
HRESULT DirectX::FinalizeVB(
const void* vbin,
size_t stride,
size_t nVerts,
const uint32_t* dupVerts,
size_t nDupVerts,
const uint32_t* vertexRemap,
void* vbout) noexcept
{
if (!vbin || !stride || !nVerts || !vbout)
return E_INVALIDARG;
if (!dupVerts && !vertexRemap)
return E_INVALIDARG;
if (dupVerts && !nDupVerts)
return E_INVALIDARG;
if (!dupVerts && nDupVerts > 0)
return E_INVALIDARG;
if (nVerts >= UINT32_MAX)
return E_INVALIDARG;
if (stride > c_MaxStride)
return E_INVALIDARG;
if ((uint64_t(nVerts) + uint64_t(nDupVerts)) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
if (vbin == vbout)
return HRESULT_E_NOT_SUPPORTED;
const size_t newVerts = nVerts + nDupVerts;
if (!newVerts)
return E_INVALIDARG;
auto sptr = static_cast<const uint8_t*>(vbin);
auto dptr = static_cast<uint8_t*>(vbout);
#ifdef _DEBUG
memset(vbout, 0, newVerts * stride);
#endif
for (size_t j = 0; j < newVerts; ++j)
{
const uint32_t src = (vertexRemap) ? vertexRemap[j] : uint32_t(j);
if (src == UNUSED32)
{
// remap entry is unused
}
else if (src >= newVerts)
{
return E_FAIL;
}
else if (src < nVerts)
{
memcpy(dptr, sptr + src * stride, stride);
}
else if (dupVerts)
{
const uint32_t dup = dupVerts[src - nVerts];
memcpy(dptr, sptr + dup * stride, stride);
}
else
return E_FAIL;
dptr += stride;
}
return S_OK;
}
#ifdef _MSC_VER
#pragma warning(pop)
#endif
_Use_decl_annotations_
HRESULT DirectX::FinalizeVB(
void* vb,
size_t stride,
size_t nVerts,
const uint32_t* vertexRemap) noexcept
{
if (nVerts >= UINT32_MAX)
return E_INVALIDARG;
return SwapVertices(vb, stride, nVerts, nullptr, vertexRemap);
}
//-------------------------------------------------------------------------------------
// Applies a vertex remap and/or a vertex duplication set to a vertex buffer and
// point representatives
//-------------------------------------------------------------------------------------
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning( disable : 6101 )
#endif
_Use_decl_annotations_
HRESULT DirectX::FinalizeVBAndPointReps(
const void* vbin,
size_t stride,
size_t nVerts,
const uint32_t* prin,
const uint32_t* dupVerts,
size_t nDupVerts,
const uint32_t* vertexRemap,
void* vbout,
uint32_t* prout) noexcept
{
if (!vbin || !stride || !nVerts || !prin || !vbout || !prout)
return E_INVALIDARG;
if (!dupVerts && !vertexRemap)
return E_INVALIDARG;
if (dupVerts && !nDupVerts)
return E_INVALIDARG;
if (!dupVerts && nDupVerts > 0)
return E_INVALIDARG;
if (nVerts >= UINT32_MAX)
return E_INVALIDARG;
if (stride > c_MaxStride)
return E_INVALIDARG;
if ((uint64_t(nVerts) + uint64_t(nDupVerts)) >= UINT32_MAX)
return HRESULT_E_ARITHMETIC_OVERFLOW;
if (vbin == vbout)
return HRESULT_E_NOT_SUPPORTED;
const size_t newVerts = nVerts + nDupVerts;
if (!newVerts)
return E_INVALIDARG;
std::unique_ptr<uint32_t[]> vertexRemapInverse;
if (vertexRemap)
{
vertexRemapInverse.reset(new (std::nothrow) uint32_t[newVerts]);
if (!vertexRemapInverse)
return E_OUTOFMEMORY;
memset(vertexRemapInverse.get(), 0xff, sizeof(uint32_t) * newVerts);
for (uint32_t j = 0; j < newVerts; ++j)
{
if (vertexRemap[j] != UNUSED32)
{
if (vertexRemap[j] >= newVerts)
return E_INVALIDARG;
vertexRemapInverse[vertexRemap[j]] = j;
}
}
}
auto sptr = static_cast<const uint8_t*>(vbin);
auto dptr = static_cast<uint8_t*>(vbout);
#ifdef _DEBUG
memset(vbout, 0, newVerts * stride);
#endif
std::unique_ptr<uint32_t[]> pointRep(new (std::nothrow) uint32_t[newVerts]);
if (!pointRep)
return E_OUTOFMEMORY;
memcpy(pointRep.get(), prin, sizeof(uint32_t) * nVerts);
for (size_t i = 0; i < nDupVerts; ++i)
{
pointRep[i + nVerts] = prin[dupVerts[i]];
}
for (size_t j = 0; j < newVerts; ++j)
{
const uint32_t src = (vertexRemap) ? vertexRemap[j] : uint32_t(j);
if (src == UNUSED32)
{
// remap entry is unused
}
else if (src >= newVerts)
{
return E_FAIL;
}
else if (src < nVerts)
{
memcpy(dptr, sptr + src * stride, stride);
const uint32_t pr = pointRep[src];
if (pr < newVerts)
{
prout[j] = (vertexRemapInverse) ? vertexRemapInverse[pr] : pr;
}
}
else if (dupVerts)
{
const uint32_t dup = dupVerts[src - nVerts];
memcpy(dptr, sptr + dup * stride, stride);
const uint32_t pr = pointRep[src];
if (pr < newVerts)
{
prout[j] = (vertexRemapInverse) ? vertexRemapInverse[pr] : pr;
}
}
else
return E_FAIL;
dptr += stride;
}
if (vertexRemap)
{
// clean up point reps for any removed vertices
for (uint32_t i = 0; i < newVerts; ++i)
{
if (vertexRemap[i] == UNUSED32)
{
pointRep[i] = UNUSED32;
}
}
}
return S_OK;
}
#ifdef _MSC_VER
#pragma warning(pop)
#endif
_Use_decl_annotations_
HRESULT DirectX::FinalizeVBAndPointReps(
void* vb,
size_t stride,
size_t nVerts,
uint32_t* pointRep,
const uint32_t* vertexRemap) noexcept
{
if (nVerts >= UINT32_MAX)
return E_INVALIDARG;
if (!pointRep || !vertexRemap)
return E_INVALIDARG;
HRESULT hr = SwapVertices(vb, stride, nVerts, pointRep, vertexRemap);
// clean up point reps for any removed vertices
for (size_t i = 0; i < nVerts; ++i)
{
if (vertexRemap[i] == UNUSED32)
{
pointRep[i] = UNUSED32;
}
}
return hr;
}
//-------------------------------------------------------------------------------------
// Applies a vertex remap which contains a known number of unused entries at the end
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::CompactVB(
const void* vbin,
size_t stride,
size_t nVerts,
size_t trailingUnused,
const uint32_t* vertexRemap,
void* vbout) noexcept
{
if (!vbin || !stride || !nVerts || !vbout || !vertexRemap)
return E_INVALIDARG;
if (nVerts >= UINT32_MAX || trailingUnused >= UINT32_MAX)
return E_INVALIDARG;
if (stride > c_MaxStride)
return E_INVALIDARG;
if (trailingUnused >= nVerts)
return E_INVALIDARG;
if (vbin == vbout)
return HRESULT_E_NOT_SUPPORTED;
const size_t newVerts = nVerts - trailingUnused;
if (!newVerts)
return E_INVALIDARG;
auto sptr = static_cast<const uint8_t*>(vbin);
auto dptr = static_cast<uint8_t*>(vbout);
#ifdef _DEBUG
memset(vbout, 0, newVerts * stride);
#endif
for (size_t j = 0; j < newVerts; ++j)
{
const uint32_t src = vertexRemap[j];
if (src == UNUSED32)
{
// remap entry is unused
}
else if (src < nVerts)
{
memcpy(dptr, sptr + src * stride, stride);
}
else
return E_FAIL;
dptr += stride;
}
return S_OK;
}
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