mirror of
https://github.com/ncblakely/GiantsTools
synced 2024-11-24 07:05:37 +01:00
377 lines
12 KiB
C++
377 lines
12 KiB
C++
//-------------------------------------------------------------------------------------
|
|
// DirectXSHD3D11.cpp -- C++ Spherical Harmonics Math Library
|
|
//
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|
// Licensed under the MIT License.
|
|
//
|
|
// http://go.microsoft.com/fwlink/p/?LinkId=262885
|
|
//-------------------------------------------------------------------------------------
|
|
|
|
#pragma warning( disable : 4616 4619 4061 4265 4626 5039 )
|
|
// C4616/C4619 #pragma warning warnings
|
|
// C4061 numerator 'identifier' in switch of enum 'enumeration' is not explicitly handled by a case label
|
|
// C4265 class has virtual functions, but destructor is not virtual
|
|
// C4626 assignment operator was implicitly defined as deleted
|
|
// C5039 pointer or reference to potentially throwing function passed to extern C function under - EHc
|
|
|
|
#pragma warning(push)
|
|
#pragma warning(disable: 4365)
|
|
#include <d3d11_1.h>
|
|
#pragma warning(pop)
|
|
|
|
#include "DirectXSH.h"
|
|
|
|
#include <DirectXPackedVector.h>
|
|
|
|
#include <cassert>
|
|
#include <memory>
|
|
#include <malloc.h>
|
|
|
|
#include <wrl/client.h>
|
|
|
|
#ifdef __clang__
|
|
#pragma clang diagnostic ignored "-Wcovered-switch-default"
|
|
#pragma clang diagnostic ignored "-Wswitch-enum"
|
|
#endif
|
|
|
|
using namespace DirectX;
|
|
|
|
using Microsoft::WRL::ComPtr;
|
|
|
|
namespace
|
|
{
|
|
struct aligned_deleter { void operator()(void* p) { _aligned_free(p); } };
|
|
|
|
using ScopedAlignedArrayXMVECTOR = std::unique_ptr<DirectX::XMVECTOR, aligned_deleter>;
|
|
|
|
//-------------------------------------------------------------------------------------
|
|
// This code is lifted from DirectXTex http://go.microsoft.com/fwlink/?LinkId=248926
|
|
// If you need additional DXGI format support, see DirectXTexConvert.cpp
|
|
//-------------------------------------------------------------------------------------
|
|
#define LOAD_SCANLINE( type, func )\
|
|
if ( size >= sizeof(type) )\
|
|
{\
|
|
const type * __restrict sPtr = reinterpret_cast<const type*>(pSource);\
|
|
for( size_t icount = 0; icount < ( size - sizeof(type) + 1 ); icount += sizeof(type) )\
|
|
{\
|
|
if ( dPtr >= ePtr ) break;\
|
|
*(dPtr++) = func( sPtr++ );\
|
|
}\
|
|
return true;\
|
|
}\
|
|
return false;
|
|
|
|
#define LOAD_SCANLINE3( type, func, defvec )\
|
|
if ( size >= sizeof(type) )\
|
|
{\
|
|
const type * __restrict sPtr = reinterpret_cast<const type*>(pSource);\
|
|
for( size_t icount = 0; icount < ( size - sizeof(type) + 1 ); icount += sizeof(type) )\
|
|
{\
|
|
XMVECTOR v = func( sPtr++ );\
|
|
if ( dPtr >= ePtr ) break;\
|
|
*(dPtr++) = XMVectorSelect( defvec, v, g_XMSelect1110 );\
|
|
}\
|
|
return true;\
|
|
}\
|
|
return false;
|
|
|
|
#define LOAD_SCANLINE2( type, func, defvec )\
|
|
if ( size >= sizeof(type) )\
|
|
{\
|
|
const type * __restrict sPtr = reinterpret_cast<const type*>(pSource);\
|
|
for( size_t icount = 0; icount < ( size - sizeof(type) + 1 ); icount += sizeof(type) )\
|
|
{\
|
|
XMVECTOR v = func( sPtr++ );\
|
|
if ( dPtr >= ePtr ) break;\
|
|
*(dPtr++) = XMVectorSelect( defvec, v, g_XMSelect1100 );\
|
|
}\
|
|
return true;\
|
|
}\
|
|
return false;
|
|
|
|
#pragma warning(push)
|
|
#pragma warning(disable : 6101)
|
|
_Success_(return)
|
|
bool _LoadScanline(
|
|
_Out_writes_(count) DirectX::XMVECTOR* pDestination,
|
|
size_t count,
|
|
_In_reads_bytes_(size) LPCVOID pSource,
|
|
size_t size,
|
|
DXGI_FORMAT format)
|
|
{
|
|
assert(pDestination && count > 0 && ((reinterpret_cast<uintptr_t>(pDestination) & 0xF) == 0));
|
|
assert(pSource && size > 0);
|
|
|
|
using namespace DirectX::PackedVector;
|
|
|
|
XMVECTOR* __restrict dPtr = pDestination;
|
|
if (!dPtr)
|
|
return false;
|
|
|
|
const XMVECTOR* ePtr = pDestination + count;
|
|
|
|
switch (format)
|
|
{
|
|
case DXGI_FORMAT_R32G32B32A32_FLOAT:
|
|
{
|
|
size_t msize = (size > (sizeof(XMVECTOR)*count)) ? (sizeof(XMVECTOR)*count) : size;
|
|
memcpy_s(dPtr, sizeof(XMVECTOR)*count, pSource, msize);
|
|
}
|
|
return true;
|
|
|
|
case DXGI_FORMAT_R32G32B32_FLOAT:
|
|
LOAD_SCANLINE3(XMFLOAT3, XMLoadFloat3, g_XMIdentityR3)
|
|
|
|
case DXGI_FORMAT_R16G16B16A16_FLOAT:
|
|
LOAD_SCANLINE(XMHALF4, XMLoadHalf4)
|
|
|
|
case DXGI_FORMAT_R32G32_FLOAT:
|
|
LOAD_SCANLINE2(XMFLOAT2, XMLoadFloat2, g_XMIdentityR3)
|
|
|
|
case DXGI_FORMAT_R11G11B10_FLOAT:
|
|
LOAD_SCANLINE3(XMFLOAT3PK, XMLoadFloat3PK, g_XMIdentityR3)
|
|
|
|
case DXGI_FORMAT_R16G16_FLOAT:
|
|
LOAD_SCANLINE2(XMHALF2, XMLoadHalf2, g_XMIdentityR3)
|
|
|
|
case DXGI_FORMAT_R32_FLOAT:
|
|
if (size >= sizeof(float))
|
|
{
|
|
const float* __restrict sPtr = reinterpret_cast<const float*>(pSource);
|
|
for (size_t icount = 0; icount < size; icount += sizeof(float))
|
|
{
|
|
XMVECTOR v = XMLoadFloat(sPtr++);
|
|
if (dPtr >= ePtr) break;
|
|
*(dPtr++) = XMVectorSelect(g_XMIdentityR3, v, g_XMSelect1000);
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
|
|
case DXGI_FORMAT_R16_FLOAT:
|
|
if (size >= sizeof(HALF))
|
|
{
|
|
const HALF * __restrict sPtr = reinterpret_cast<const HALF*>(pSource);
|
|
for (size_t icount = 0; icount < size; icount += sizeof(HALF))
|
|
{
|
|
if (dPtr >= ePtr) break;
|
|
*(dPtr++) = XMVectorSet(XMConvertHalfToFloat(*sPtr++), 0.f, 0.f, 1.f);
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
#pragma warning(pop)
|
|
|
|
} // namespace anonymous
|
|
|
|
//-------------------------------------------------------------------------------------
|
|
// Projects a function represented in a cube map into spherical harmonics.
|
|
//
|
|
// http://msdn.microsoft.com/en-us/library/windows/desktop/ff476300.aspx
|
|
//-------------------------------------------------------------------------------------
|
|
_Use_decl_annotations_
|
|
HRESULT DirectX::SHProjectCubeMap(
|
|
ID3D11DeviceContext *context,
|
|
size_t order,
|
|
ID3D11Texture2D *cubeMap,
|
|
float *resultR,
|
|
float *resultG,
|
|
float* resultB) noexcept
|
|
{
|
|
if (!context || !cubeMap)
|
|
return E_INVALIDARG;
|
|
|
|
if (order < XM_SH_MINORDER || order > XM_SH_MAXORDER)
|
|
return E_INVALIDARG;
|
|
|
|
D3D11_TEXTURE2D_DESC desc;
|
|
cubeMap->GetDesc(&desc);
|
|
|
|
if ((desc.ArraySize != 6)
|
|
|| (desc.Width != desc.Height)
|
|
|| (desc.SampleDesc.Count > 1))
|
|
return E_FAIL;
|
|
|
|
switch (desc.Format)
|
|
{
|
|
case DXGI_FORMAT_R32G32B32A32_FLOAT:
|
|
case DXGI_FORMAT_R32G32B32_FLOAT:
|
|
case DXGI_FORMAT_R16G16B16A16_FLOAT:
|
|
case DXGI_FORMAT_R32G32_FLOAT:
|
|
case DXGI_FORMAT_R11G11B10_FLOAT:
|
|
case DXGI_FORMAT_R16G16_FLOAT:
|
|
case DXGI_FORMAT_R32_FLOAT:
|
|
case DXGI_FORMAT_R16_FLOAT:
|
|
// See _LoadScanline to support more pixel formats
|
|
break;
|
|
|
|
default:
|
|
return E_FAIL;
|
|
}
|
|
|
|
//--- Create a staging resource copy (if needed) to be able to read data
|
|
ID3D11Texture2D* texture = nullptr;
|
|
|
|
ComPtr<ID3D11Texture2D> staging;
|
|
if (!(desc.CPUAccessFlags & D3D11_CPU_ACCESS_READ))
|
|
{
|
|
D3D11_TEXTURE2D_DESC sdesc = desc;
|
|
sdesc.BindFlags = 0;
|
|
sdesc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
|
|
sdesc.Usage = D3D11_USAGE_STAGING;
|
|
|
|
ComPtr<ID3D11Device> device;
|
|
context->GetDevice(&device);
|
|
|
|
HRESULT hr = device->CreateTexture2D(&sdesc, nullptr, &staging);
|
|
if (FAILED(hr))
|
|
return hr;
|
|
|
|
context->CopyResource(staging.Get(), cubeMap);
|
|
|
|
texture = staging.Get();
|
|
}
|
|
else
|
|
texture = cubeMap;
|
|
|
|
assert(texture != nullptr);
|
|
|
|
//--- Setup for SH projection
|
|
ScopedAlignedArrayXMVECTOR scanline(reinterpret_cast<XMVECTOR*>(_aligned_malloc(sizeof(XMVECTOR)*desc.Width, 16)));
|
|
if (!scanline)
|
|
return E_OUTOFMEMORY;
|
|
|
|
assert(desc.Width > 0);
|
|
float fSize = static_cast<float>(desc.Width);
|
|
float fPicSize = 1.0f / fSize;
|
|
|
|
// index from [0,W-1], f(0) maps to -1 + 1/W, f(W-1) maps to 1 - 1/w
|
|
// linear function x*S +B, 1st constraint means B is (-1+1/W), plug into
|
|
// second and solve for S: S = 2*(1-1/W)/(W-1). The old code that did
|
|
// this was incorrect - but only for computing the differential solid
|
|
// angle, where the final value was 1.0 instead of 1-1/w...
|
|
|
|
float fB = -1.0f + 1.0f / fSize;
|
|
float fS = (desc.Width > 1) ? (2.0f*(1.0f - 1.0f / fSize) / (fSize - 1.0f)) : 0.f;
|
|
|
|
// clear out accumulation variables
|
|
float fWt = 0.0f;
|
|
|
|
if (resultR)
|
|
memset(resultR, 0, sizeof(float)*order*order);
|
|
if (resultG)
|
|
memset(resultG, 0, sizeof(float)*order*order);
|
|
if (resultB)
|
|
memset(resultB, 0, sizeof(float)*order*order);
|
|
|
|
float shBuff[XM_SH_MAXORDER*XM_SH_MAXORDER] = {};
|
|
float shBuffB[XM_SH_MAXORDER*XM_SH_MAXORDER] = {};
|
|
|
|
//--- Process each face of the cubemap
|
|
for (UINT face = 0; face < 6; ++face)
|
|
{
|
|
UINT dindex = D3D11CalcSubresource(0, face, desc.MipLevels);
|
|
|
|
D3D11_MAPPED_SUBRESOURCE mapped;
|
|
HRESULT hr = context->Map(texture, dindex, D3D11_MAP_READ, 0, &mapped);
|
|
if (FAILED(hr))
|
|
return hr;
|
|
|
|
const uint8_t *pSrc = reinterpret_cast<const uint8_t*>(mapped.pData);
|
|
for (UINT y = 0; y < desc.Height; ++y)
|
|
{
|
|
XMVECTOR* ptr = scanline.get();
|
|
if (!_LoadScanline(ptr, desc.Width, pSrc, mapped.RowPitch, desc.Format))
|
|
{
|
|
context->Unmap(texture, dindex);
|
|
return E_FAIL;
|
|
}
|
|
|
|
const float v = float(y) * fS + fB;
|
|
|
|
XMVECTOR* pixel = ptr;
|
|
for (UINT x = 0; x < desc.Width; ++x, ++pixel)
|
|
{
|
|
const float u = float(x) * fS + fB;
|
|
|
|
float ix, iy, iz;
|
|
switch (face)
|
|
{
|
|
case 0: // Positive X
|
|
iz = 1.0f - (2.0f * float(x) + 1.0f) * fPicSize;
|
|
iy = 1.0f - (2.0f * float(y) + 1.0f) * fPicSize;
|
|
ix = 1.0f;
|
|
break;
|
|
|
|
case 1: // Negative X
|
|
iz = -1.0f + (2.0f * float(x) + 1.0f) * fPicSize;
|
|
iy = 1.0f - (2.0f * float(y) + 1.0f) * fPicSize;
|
|
ix = -1;
|
|
break;
|
|
|
|
case 2: // Positive Y
|
|
iz = -1.0f + (2.0f * float(y) + 1.0f) * fPicSize;
|
|
iy = 1.0f;
|
|
ix = -1.0f + (2.0f * float(x) + 1.0f) * fPicSize;
|
|
break;
|
|
|
|
case 3: // Negative Y
|
|
iz = 1.0f - (2.0f * float(y) + 1.0f) * fPicSize;
|
|
iy = -1.0f;
|
|
ix = -1.0f + (2.0f * float(x) + 1.0f) * fPicSize;
|
|
break;
|
|
|
|
case 4: // Positive Z
|
|
iz = 1.0f;
|
|
iy = 1.0f - (2.0f * float(y) + 1.0f) * fPicSize;
|
|
ix = -1.0f + (2.0f * float(x) + 1.0f) * fPicSize;
|
|
break;
|
|
|
|
case 5: // Negative Z
|
|
iz = -1.0f;
|
|
iy = 1.0f - (2.0f * float(y) + 1.0f) * fPicSize;
|
|
ix = 1.0f - (2.0f * float(x) + 1.0f) * fPicSize;
|
|
break;
|
|
|
|
default:
|
|
ix = iy = iz = 0.f;
|
|
assert(false);
|
|
break;
|
|
}
|
|
|
|
XMVECTOR dir = XMVectorSet(ix, iy, iz, 0);
|
|
dir = XMVector3Normalize(dir);
|
|
|
|
const float fDiffSolid = 4.0f / ((1.0f + u * u + v * v)*sqrtf(1.0f + u * u + v * v));
|
|
fWt += fDiffSolid;
|
|
|
|
XMSHEvalDirection(shBuff, order, dir);
|
|
|
|
XMFLOAT3A clr;
|
|
XMStoreFloat3A(&clr, *pixel);
|
|
|
|
if (resultR) XMSHAdd(resultR, order, resultR, XMSHScale(shBuffB, order, shBuff, clr.x*fDiffSolid));
|
|
if (resultG) XMSHAdd(resultG, order, resultG, XMSHScale(shBuffB, order, shBuff, clr.y*fDiffSolid));
|
|
if (resultB) XMSHAdd(resultB, order, resultB, XMSHScale(shBuffB, order, shBuff, clr.z*fDiffSolid));
|
|
}
|
|
|
|
pSrc += mapped.RowPitch;
|
|
}
|
|
|
|
context->Unmap(texture, dindex);
|
|
}
|
|
|
|
const float fNormProj = (4.0f*XM_PI) / fWt;
|
|
|
|
if (resultR) XMSHScale(resultR, order, resultR, fNormProj);
|
|
if (resultG) XMSHScale(resultG, order, resultG, fNormProj);
|
|
if (resultB) XMSHScale(resultB, order, resultB, fNormProj);
|
|
|
|
return S_OK;
|
|
}
|