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515 lines (423 loc) · 14.5 KB
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//-------------------------------------------------------------------------------------
// DirectXMeshUtil.cpp
//
// DirectX Mesh Geometry Library - Utilities
//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
//
// http://go.microsoft.com/fwlink/?LinkID=324981
//-------------------------------------------------------------------------------------
#include "DirectXMeshP.h"
using namespace DirectX;
#if defined(_XBOX_ONE) && defined(_TITLE)
static_assert(XBOX_DXGI_FORMAT_R10G10B10_SNORM_A2_UNORM == DXGI_FORMAT_R10G10B10_SNORM_A2_UNORM, "Xbox One XDK mismatch detected");
#endif
//=====================================================================================
// DXGI Format Utilities
//=====================================================================================
//-------------------------------------------------------------------------------------
// Returns bytes-per-element for a given DXGI format, or 0 on failure
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
size_t DirectX::BytesPerElement(DXGI_FORMAT fmt) noexcept
{
// This list only includes those formats that are valid for use by IB or VB
switch (static_cast<int>(fmt))
{
case DXGI_FORMAT_R32G32B32A32_FLOAT:
case DXGI_FORMAT_R32G32B32A32_UINT:
case DXGI_FORMAT_R32G32B32A32_SINT:
return 16;
case DXGI_FORMAT_R32G32B32_FLOAT:
case DXGI_FORMAT_R32G32B32_UINT:
case DXGI_FORMAT_R32G32B32_SINT:
return 12;
case DXGI_FORMAT_R16G16B16A16_FLOAT:
case DXGI_FORMAT_R16G16B16A16_UNORM:
case DXGI_FORMAT_R16G16B16A16_UINT:
case DXGI_FORMAT_R16G16B16A16_SNORM:
case DXGI_FORMAT_R16G16B16A16_SINT:
case DXGI_FORMAT_R32G32_FLOAT:
case DXGI_FORMAT_R32G32_UINT:
case DXGI_FORMAT_R32G32_SINT:
return 8;
case DXGI_FORMAT_R10G10B10A2_UNORM:
case DXGI_FORMAT_R10G10B10A2_UINT:
case DXGI_FORMAT_R11G11B10_FLOAT:
case DXGI_FORMAT_R8G8B8A8_UNORM:
case DXGI_FORMAT_R8G8B8A8_UINT:
case DXGI_FORMAT_R8G8B8A8_SNORM:
case DXGI_FORMAT_R8G8B8A8_SINT:
case DXGI_FORMAT_R16G16_FLOAT:
case DXGI_FORMAT_R16G16_UNORM:
case DXGI_FORMAT_R16G16_UINT:
case DXGI_FORMAT_R16G16_SNORM:
case DXGI_FORMAT_R16G16_SINT:
case DXGI_FORMAT_R32_FLOAT:
case DXGI_FORMAT_R32_UINT:
case DXGI_FORMAT_R32_SINT:
case DXGI_FORMAT_B8G8R8A8_UNORM:
case DXGI_FORMAT_B8G8R8X8_UNORM:
case XBOX_DXGI_FORMAT_R10G10B10_SNORM_A2_UNORM:
return 4;
case DXGI_FORMAT_R8G8_UNORM:
case DXGI_FORMAT_R8G8_UINT:
case DXGI_FORMAT_R8G8_SNORM:
case DXGI_FORMAT_R8G8_SINT:
case DXGI_FORMAT_R16_FLOAT:
case DXGI_FORMAT_R16_UNORM:
case DXGI_FORMAT_R16_UINT:
case DXGI_FORMAT_R16_SNORM:
case DXGI_FORMAT_R16_SINT:
case DXGI_FORMAT_B5G6R5_UNORM:
case DXGI_FORMAT_B5G5R5A1_UNORM:
return 2;
case DXGI_FORMAT_R8_UNORM:
case DXGI_FORMAT_R8_UINT:
case DXGI_FORMAT_R8_SNORM:
case DXGI_FORMAT_R8_SINT:
return 1;
case DXGI_FORMAT_B4G4R4A4_UNORM:
return 2;
default:
// No BC, sRGB, XRBias, SharedExp, Typeless, Depth, or Video formats
return 0;
}
}
//=====================================================================================
// Input Layout Descriptor Utilities
//=====================================================================================
//-------------------------------------------------------------------------------------
// Validates a Direct3D Input Layout
//-------------------------------------------------------------------------------------
#if defined(__d3d11_h__) || defined(__d3d11_x_h__)
_Use_decl_annotations_
bool DirectX::IsValid(const D3D11_INPUT_ELEMENT_DESC* vbDecl, size_t nDecl) noexcept
{
if (!vbDecl || !nDecl)
{
// Note that 0 is allowed by the runtime for degenerate cases, but is not defined for DirectXMesh
return false;
}
if (nDecl > D3D11_IA_VERTEX_INPUT_STRUCTURE_ELEMENT_COUNT)
{
// The upper-limit depends on feature level, so we assume highest value here
return false;
}
for (size_t j = 0; j < nDecl; ++j)
{
size_t bpe = BytesPerElement(vbDecl[j].Format);
if (!bpe)
{
// Not a valid DXGI format or it's not valid for VB usage
return false;
}
uint32_t alignment;
if (bpe == 1)
alignment = 1;
else if (bpe == 2)
alignment = 2;
else
alignment = 4;
if ((vbDecl[j].AlignedByteOffset != D3D11_APPEND_ALIGNED_ELEMENT)
&& (vbDecl[j].AlignedByteOffset % alignment) != 0)
{
// Invalid alignment for element
return false;
}
if (vbDecl[j].InputSlot >= D3D11_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT)
{
// The upper-limit depends on feature level, so we assume highest value here
return false;
}
switch (vbDecl[j].InputSlotClass)
{
case D3D11_INPUT_PER_VERTEX_DATA:
if (vbDecl[j].InstanceDataStepRate != 0)
{
return false;
}
break;
case D3D11_INPUT_PER_INSTANCE_DATA:
break;
default:
return false;
}
if (!vbDecl[j].SemanticName)
{
return false;
}
// Debug layer also checks for trailing digit in the semantic name, and checks
// for inconsistent semantic name/slot assignment.
}
return true;
}
#endif
#if defined(__d3d12_h__) || defined(__d3d12_x_h__) || defined(__XBOX_D3D12_X__)
bool DirectX::IsValid(const D3D12_INPUT_LAYOUT_DESC& vbDecl) noexcept
{
if (!vbDecl.pInputElementDescs || !vbDecl.NumElements)
{
// Note that 0 is allowed by the runtime for degenerate cases, but is not defined for DirectXMesh
return false;
}
if (vbDecl.NumElements > D3D12_IA_VERTEX_INPUT_STRUCTURE_ELEMENT_COUNT)
{
return false;
}
for (size_t j = 0; j < vbDecl.NumElements; ++j)
{
size_t bpe = BytesPerElement(vbDecl.pInputElementDescs[j].Format);
if (!bpe)
{
// Not a valid DXGI format or it's not valid for VB usage
return false;
}
uint32_t alignment;
if (bpe == 1)
alignment = 1;
else if (bpe == 2)
alignment = 2;
else
alignment = 4;
if ((vbDecl.pInputElementDescs[j].AlignedByteOffset != D3D12_APPEND_ALIGNED_ELEMENT)
&& (vbDecl.pInputElementDescs[j].AlignedByteOffset % alignment) != 0)
{
// Invalid alignment for element
return false;
}
if (vbDecl.pInputElementDescs[j].InputSlot >= D3D12_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT)
{
// The upper-limit depends on feature level, so we assume highest value here
return false;
}
switch (vbDecl.pInputElementDescs[j].InputSlotClass)
{
case D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA:
if (vbDecl.pInputElementDescs[j].InstanceDataStepRate != 0)
{
return false;
}
break;
case D3D12_INPUT_CLASSIFICATION_PER_INSTANCE_DATA:
break;
default:
return false;
}
if (!vbDecl.pInputElementDescs[j].SemanticName)
{
return false;
}
// Debug layer also checks for trailing digit in the semantic name, and checks
// for inconsistent semantic name/slot assignment.
}
return true;
}
#endif
//-------------------------------------------------------------------------------------
// Compute the offsets to each element, and total stride of each slot
//-------------------------------------------------------------------------------------
#if defined(__d3d11_h__) || defined(__d3d11_x_h__)
_Use_decl_annotations_
void DirectX::ComputeInputLayout(
const D3D11_INPUT_ELEMENT_DESC* vbDecl, size_t nDecl,
uint32_t* offsets, uint32_t* strides) noexcept
{
assert(IsValid(vbDecl, nDecl));
if (offsets)
memset(offsets, 0, sizeof(uint32_t) * nDecl);
if (strides)
memset(strides, 0, sizeof(uint32_t) * D3D11_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT);
uint32_t prevABO[D3D11_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT];
memset(prevABO, 0, sizeof(uint32_t) * D3D11_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT);
for (size_t j = 0; j < nDecl; ++j)
{
uint32_t slot = vbDecl[j].InputSlot;
if (slot >= D3D11_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT)
{
// ignore bad input slots
continue;
}
size_t bpe = BytesPerElement(vbDecl[j].Format);
if (!bpe)
{
// ignore invalid format
continue;
}
uint32_t alignment;
if (bpe == 1)
alignment = 1;
else if (bpe == 2)
alignment = 2;
else
alignment = 4;
uint32_t alignedByteOffset = vbDecl[j].AlignedByteOffset;
if (alignedByteOffset == D3D11_APPEND_ALIGNED_ELEMENT)
{
alignedByteOffset = prevABO[slot];
}
if (offsets)
{
offsets[j] = alignedByteOffset;
}
if (strides)
{
uint32_t istride = uint32_t(alignedByteOffset + bpe);
strides[slot] = std::max<uint32_t>(strides[slot], istride);
}
prevABO[slot] = uint32_t(alignedByteOffset + bpe + (bpe % alignment));
}
}
#endif
#if defined(__d3d12_h__) || defined(__d3d12_x_h__) || defined(__XBOX_D3D12_X__)
_Use_decl_annotations_
void DirectX::ComputeInputLayout(const D3D12_INPUT_LAYOUT_DESC& vbDecl,
uint32_t* offsets, uint32_t* strides) noexcept
{
assert(IsValid(vbDecl));
if (offsets)
memset(offsets, 0, sizeof(uint32_t) * vbDecl.NumElements);
if (strides)
memset(strides, 0, sizeof(uint32_t) * D3D12_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT);
uint32_t prevABO[D3D12_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT] = {};
for (size_t j = 0; j < vbDecl.NumElements; ++j)
{
uint32_t slot = vbDecl.pInputElementDescs[j].InputSlot;
if (slot >= D3D12_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT)
{
// ignore bad input slots
continue;
}
size_t bpe = BytesPerElement(vbDecl.pInputElementDescs[j].Format);
if (!bpe)
{
// ignore invalid format
continue;
}
uint32_t alignment;
if (bpe == 1)
alignment = 1;
else if (bpe == 2)
alignment = 2;
else
alignment = 4;
uint32_t alignedByteOffset = vbDecl.pInputElementDescs[j].AlignedByteOffset;
if (alignedByteOffset == D3D12_APPEND_ALIGNED_ELEMENT)
{
alignedByteOffset = prevABO[slot];
}
if (offsets)
{
offsets[j] = alignedByteOffset;
}
if (strides)
{
uint32_t istride = uint32_t(alignedByteOffset + bpe);
strides[slot] = std::max<uint32_t>(strides[slot], istride);
}
prevABO[slot] = uint32_t(alignedByteOffset + bpe + (bpe % alignment));
}
}
#endif
//=====================================================================================
// Attribute Utilities
//=====================================================================================
_Use_decl_annotations_
std::vector<std::pair<size_t, size_t>> DirectX::ComputeSubsets(const uint32_t* attributes, size_t nFaces)
{
std::vector<std::pair<size_t, size_t>> subsets;
if (!nFaces)
return subsets;
if (!attributes)
{
subsets.emplace_back(std::pair<size_t, size_t>(0u, nFaces));
return subsets;
}
uint32_t lastAttr = attributes[0];
size_t offset = 0;
size_t count = 1;
for (size_t j = 1; j < nFaces; ++j)
{
if (attributes[j] != lastAttr)
{
subsets.emplace_back(std::pair<size_t, size_t>(offset, count));
lastAttr = attributes[j];
offset = j;
count = 1;
}
else
{
count += 1;
}
}
if (count > 0)
{
subsets.emplace_back(std::pair<size_t, size_t>(offset, count));
}
return subsets;
}
//=====================================================================================
// Mesh Optimization Utilities
//=====================================================================================
namespace
{
template<class index_t>
void ComputeVertexCacheMissRateImpl(
_In_reads_(nFaces * 3) const index_t* indices, size_t nFaces, size_t nVerts, size_t cacheSize,
float& acmr, float& atvr)
{
acmr = -1.f;
atvr = -1.f;
if (!indices || !nFaces || !nVerts || !cacheSize)
return;
if ((uint64_t(nFaces) * 3) >= UINT32_MAX)
return;
if (nVerts >= index_t(-1))
return;
size_t misses = 0;
std::unique_ptr<uint32_t[]> fifo(new uint32_t[cacheSize]);
size_t tail = 0;
memset(fifo.get(), 0xff, sizeof(uint32_t) * cacheSize);
for (size_t j = 0; j < (nFaces * 3); ++j)
{
if (indices[j] == index_t(-1))
continue;
bool found = false;
for (size_t ptr = 0; ptr < cacheSize; ++ptr)
{
if (fifo[ptr] == indices[j])
{
found = true;
break;
}
}
if (!found)
{
++misses;
fifo[tail] = indices[j];
++tail;
if (tail == cacheSize) tail = 0;
}
}
// ideal is 0.5, individual tris have 3.0
acmr = float(misses) / float(nFaces);
// ideal is 1.0, worst case is 6.0
atvr = float(misses) / float(nVerts);
}
}
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
void DirectX::ComputeVertexCacheMissRate(
const uint16_t* indices, size_t nFaces, size_t nVerts, size_t cacheSize,
float& acmr, float& atvr)
{
ComputeVertexCacheMissRateImpl<uint16_t>(indices, nFaces, nVerts, cacheSize, acmr, atvr);
}
_Use_decl_annotations_
void DirectX::ComputeVertexCacheMissRate(
const uint32_t* indices, size_t nFaces, size_t nVerts, size_t cacheSize,
float& acmr, float& atvr)
{
ComputeVertexCacheMissRateImpl<uint32_t>(indices, nFaces, nVerts, cacheSize, acmr, atvr);
}
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