394 lines
12 KiB
C++
394 lines
12 KiB
C++
//-------------------------------------------------------------------------------------
|
|
// DirectXTexNormalMaps.cpp
|
|
//
|
|
// DirectX Texture Library - Normal map operations
|
|
//
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|
// Licensed under the MIT License.
|
|
//
|
|
// http://go.microsoft.com/fwlink/?LinkId=248926
|
|
//-------------------------------------------------------------------------------------
|
|
|
|
#include "directxtexp.h"
|
|
|
|
using namespace DirectX;
|
|
|
|
namespace
|
|
{
|
|
|
|
#pragma prefast(suppress : 25000, "FXMVECTOR is 16 bytes")
|
|
inline float EvaluateColor(_In_ FXMVECTOR val, _In_ DWORD flags)
|
|
{
|
|
XMFLOAT4A f;
|
|
|
|
static XMVECTORF32 lScale = { { { 0.2125f, 0.7154f, 0.0721f, 1.f } } };
|
|
|
|
static_assert(CNMAP_CHANNEL_RED == 0x1, "CNMAP_CHANNEL_ flag values don't match mask");
|
|
switch (flags & 0xf)
|
|
{
|
|
case 0:
|
|
case CNMAP_CHANNEL_RED: return XMVectorGetX(val);
|
|
case CNMAP_CHANNEL_GREEN: return XMVectorGetY(val);
|
|
case CNMAP_CHANNEL_BLUE: return XMVectorGetZ(val);
|
|
case CNMAP_CHANNEL_ALPHA: return XMVectorGetW(val);
|
|
|
|
case CNMAP_CHANNEL_LUMINANCE:
|
|
{
|
|
XMVECTOR v = XMVectorMultiply(val, lScale);
|
|
XMStoreFloat4A(&f, v);
|
|
return f.x + f.y + f.z;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
assert(false);
|
|
return 0.f;
|
|
}
|
|
}
|
|
|
|
void EvaluateRow(
|
|
_In_reads_(width) const XMVECTOR* pSource,
|
|
_Out_writes_(width + 2) float* pDest,
|
|
size_t width,
|
|
DWORD flags)
|
|
{
|
|
assert(pSource && pDest);
|
|
assert(width > 0);
|
|
|
|
for (size_t x = 0; x < width; ++x)
|
|
{
|
|
pDest[x + 1] = EvaluateColor(pSource[x], flags);
|
|
}
|
|
|
|
if (flags & CNMAP_MIRROR_U)
|
|
{
|
|
// Mirror in U
|
|
pDest[0] = EvaluateColor(pSource[0], flags);
|
|
pDest[width + 1] = EvaluateColor(pSource[width - 1], flags);
|
|
}
|
|
else
|
|
{
|
|
// Wrap in U
|
|
pDest[0] = EvaluateColor(pSource[width - 1], flags);
|
|
pDest[width + 1] = EvaluateColor(pSource[0], flags);
|
|
}
|
|
}
|
|
|
|
HRESULT ComputeNMap(_In_ const Image& srcImage, _In_ DWORD flags, _In_ float amplitude,
|
|
_In_ DXGI_FORMAT format, _In_ const Image& normalMap)
|
|
{
|
|
if (!srcImage.pixels || !normalMap.pixels)
|
|
return E_INVALIDARG;
|
|
|
|
const DWORD convFlags = _GetConvertFlags(format);
|
|
if (!convFlags)
|
|
return E_FAIL;
|
|
|
|
if (!(convFlags & (CONVF_UNORM | CONVF_SNORM | CONVF_FLOAT)))
|
|
return HRESULT_FROM_WIN32(ERROR_NOT_SUPPORTED);
|
|
|
|
const size_t width = srcImage.width;
|
|
const size_t height = srcImage.height;
|
|
if (width != normalMap.width || height != normalMap.height)
|
|
return E_FAIL;
|
|
|
|
// Allocate temporary space (4 scanlines and 3 evaluated rows)
|
|
ScopedAlignedArrayXMVECTOR scanline(static_cast<XMVECTOR*>(_aligned_malloc((sizeof(XMVECTOR)*width * 4), 16)));
|
|
if (!scanline)
|
|
return E_OUTOFMEMORY;
|
|
|
|
ScopedAlignedArrayFloat buffer(static_cast<float*>(_aligned_malloc(((sizeof(float) * (width + 2)) * 3), 16)));
|
|
if (!buffer)
|
|
return E_OUTOFMEMORY;
|
|
|
|
uint8_t* pDest = normalMap.pixels;
|
|
if (!pDest)
|
|
return E_POINTER;
|
|
|
|
XMVECTOR* row0 = scanline.get();
|
|
XMVECTOR* row1 = row0 + width;
|
|
XMVECTOR* row2 = row1 + width;
|
|
XMVECTOR* target = row2 + width;
|
|
|
|
float* val0 = buffer.get();
|
|
float* val1 = val0 + width + 2;
|
|
float* val2 = val1 + width + 2;
|
|
|
|
const size_t rowPitch = srcImage.rowPitch;
|
|
const uint8_t* pSrc = srcImage.pixels;
|
|
|
|
// Read first scanline row into 'row1'
|
|
if (!_LoadScanline(row1, width, pSrc, rowPitch, srcImage.format))
|
|
return E_FAIL;
|
|
|
|
// Setup 'row0'
|
|
if (flags & CNMAP_MIRROR_V)
|
|
{
|
|
// Mirror first row
|
|
memcpy_s(row0, rowPitch, row1, rowPitch);
|
|
}
|
|
else
|
|
{
|
|
// Read last row (Wrap V)
|
|
if (!_LoadScanline(row0, width, pSrc + (rowPitch * (height - 1)), rowPitch, srcImage.format))
|
|
return E_FAIL;
|
|
}
|
|
|
|
// Evaluate the initial rows
|
|
EvaluateRow(row0, val0, width, flags);
|
|
EvaluateRow(row1, val1, width, flags);
|
|
|
|
pSrc += rowPitch;
|
|
|
|
for (size_t y = 0; y < height; ++y)
|
|
{
|
|
// Load next scanline of source image
|
|
if (y < (height - 1))
|
|
{
|
|
if (!_LoadScanline(row2, width, pSrc, rowPitch, srcImage.format))
|
|
return E_FAIL;
|
|
}
|
|
else
|
|
{
|
|
if (flags & CNMAP_MIRROR_V)
|
|
{
|
|
// Use last row of source image
|
|
if (!_LoadScanline(row2, width, srcImage.pixels + (rowPitch * (height - 1)), rowPitch, srcImage.format))
|
|
return E_FAIL;
|
|
}
|
|
else
|
|
{
|
|
// Use first row of source image (Wrap V)
|
|
if (!_LoadScanline(row2, width, srcImage.pixels, rowPitch, srcImage.format))
|
|
return E_FAIL;
|
|
}
|
|
}
|
|
|
|
// Evaluate row
|
|
EvaluateRow(row2, val2, width, flags);
|
|
|
|
// Generate target scanline
|
|
XMVECTOR *dptr = target;
|
|
for (size_t x = 0; x < width; ++x)
|
|
{
|
|
// Compute normal via central differencing
|
|
float totDelta = (val0[x] - val0[x + 2]) + (val1[x] - val1[x + 2]) + (val2[x] - val2[x + 2]);
|
|
float deltaZX = totDelta * amplitude / 6.f;
|
|
|
|
totDelta = (val0[x] - val2[x]) + (val0[x + 1] - val2[x + 1]) + (val0[x + 2] - val2[x + 2]);
|
|
float deltaZY = totDelta * amplitude / 6.f;
|
|
|
|
XMVECTOR vx = XMVectorSetZ(g_XMNegIdentityR0, deltaZX); // (-1.0f, 0.0f, deltaZX)
|
|
XMVECTOR vy = XMVectorSetZ(g_XMNegIdentityR1, deltaZY); // (0.0f, -1.0f, deltaZY)
|
|
|
|
XMVECTOR normal = XMVector3Normalize(XMVector3Cross(vx, vy));
|
|
|
|
// Compute alpha (1.0 or an occlusion term)
|
|
float alpha = 1.f;
|
|
|
|
if (flags & CNMAP_COMPUTE_OCCLUSION)
|
|
{
|
|
float delta = 0.f;
|
|
float c = val1[x + 1];
|
|
|
|
float t = val0[x] - c; if (t > 0.f) delta += t;
|
|
t = val0[x + 1] - c; if (t > 0.f) delta += t;
|
|
t = val0[x + 2] - c; if (t > 0.f) delta += t;
|
|
t = val1[x] - c; if (t > 0.f) delta += t;
|
|
// Skip current pixel
|
|
t = val1[x + 2] - c; if (t > 0.f) delta += t;
|
|
t = val2[x] - c; if (t > 0.f) delta += t;
|
|
t = val2[x + 1] - c; if (t > 0.f) delta += t;
|
|
t = val2[x + 2] - c; if (t > 0.f) delta += t;
|
|
|
|
// Average delta (divide by 8, scale by amplitude factor)
|
|
delta *= 0.125f * amplitude;
|
|
if (delta > 0.f)
|
|
{
|
|
// If < 0, then no occlusion
|
|
float r = sqrtf(1.f + delta*delta);
|
|
alpha = (r - delta) / r;
|
|
}
|
|
}
|
|
|
|
// Encode based on target format
|
|
if (convFlags & CONVF_UNORM)
|
|
{
|
|
// 0.5f*normal + 0.5f -or- invert sign case: -0.5f*normal + 0.5f
|
|
XMVECTOR n1 = XMVectorMultiplyAdd((flags & CNMAP_INVERT_SIGN) ? g_XMNegativeOneHalf : g_XMOneHalf, normal, g_XMOneHalf);
|
|
*dptr++ = XMVectorSetW(n1, alpha);
|
|
}
|
|
else if (flags & CNMAP_INVERT_SIGN)
|
|
{
|
|
*dptr++ = XMVectorSetW(XMVectorNegate(normal), alpha);
|
|
}
|
|
else
|
|
{
|
|
*dptr++ = XMVectorSetW(normal, alpha);
|
|
}
|
|
}
|
|
|
|
if (!_StoreScanline(pDest, normalMap.rowPitch, format, target, width))
|
|
return E_FAIL;
|
|
|
|
// Cycle buffers
|
|
float* temp = val0;
|
|
val0 = val1;
|
|
val1 = val2;
|
|
val2 = temp;
|
|
|
|
pSrc += rowPitch;
|
|
pDest += normalMap.rowPitch;
|
|
}
|
|
|
|
return S_OK;
|
|
}
|
|
}
|
|
|
|
|
|
//=====================================================================================
|
|
// Entry points
|
|
//=====================================================================================
|
|
|
|
//-------------------------------------------------------------------------------------
|
|
// Generates a normal map from a height-map
|
|
//-------------------------------------------------------------------------------------
|
|
_Use_decl_annotations_
|
|
HRESULT DirectX::ComputeNormalMap(
|
|
const Image& srcImage,
|
|
DWORD flags,
|
|
float amplitude,
|
|
DXGI_FORMAT format,
|
|
ScratchImage& normalMap)
|
|
{
|
|
if (!srcImage.pixels || !IsValid(format))
|
|
return E_INVALIDARG;
|
|
|
|
static_assert(CNMAP_CHANNEL_RED == 0x1, "CNMAP_CHANNEL_ flag values don't match mask");
|
|
switch (flags & 0xf)
|
|
{
|
|
case 0:
|
|
case CNMAP_CHANNEL_RED:
|
|
case CNMAP_CHANNEL_GREEN:
|
|
case CNMAP_CHANNEL_BLUE:
|
|
case CNMAP_CHANNEL_ALPHA:
|
|
case CNMAP_CHANNEL_LUMINANCE:
|
|
break;
|
|
|
|
default:
|
|
return E_INVALIDARG;
|
|
}
|
|
|
|
if (IsCompressed(format) || IsCompressed(srcImage.format)
|
|
|| IsTypeless(format) || IsTypeless(srcImage.format)
|
|
|| IsPlanar(format) || IsPlanar(srcImage.format)
|
|
|| IsPalettized(format) || IsPalettized(srcImage.format))
|
|
return HRESULT_FROM_WIN32(ERROR_NOT_SUPPORTED);
|
|
|
|
// Setup target image
|
|
normalMap.Release();
|
|
|
|
HRESULT hr = normalMap.Initialize2D(format, srcImage.width, srcImage.height, 1, 1);
|
|
if (FAILED(hr))
|
|
return hr;
|
|
|
|
const Image *img = normalMap.GetImage(0, 0, 0);
|
|
if (!img)
|
|
{
|
|
normalMap.Release();
|
|
return E_POINTER;
|
|
}
|
|
|
|
hr = ComputeNMap(srcImage, flags, amplitude, format, *img);
|
|
if (FAILED(hr))
|
|
{
|
|
normalMap.Release();
|
|
return hr;
|
|
}
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
_Use_decl_annotations_
|
|
HRESULT DirectX::ComputeNormalMap(
|
|
const Image* srcImages,
|
|
size_t nimages,
|
|
const TexMetadata& metadata,
|
|
DWORD flags,
|
|
float amplitude,
|
|
DXGI_FORMAT format,
|
|
ScratchImage& normalMaps)
|
|
{
|
|
if (!srcImages || !nimages || !IsValid(format))
|
|
return E_INVALIDARG;
|
|
|
|
if (IsCompressed(format) || IsCompressed(metadata.format)
|
|
|| IsTypeless(format) || IsTypeless(metadata.format)
|
|
|| IsPlanar(format) || IsPlanar(metadata.format)
|
|
|| IsPalettized(format) || IsPalettized(metadata.format))
|
|
return HRESULT_FROM_WIN32(ERROR_NOT_SUPPORTED);
|
|
|
|
static_assert(CNMAP_CHANNEL_RED == 0x1, "CNMAP_CHANNEL_ flag values don't match mask");
|
|
switch (flags & 0xf)
|
|
{
|
|
case 0:
|
|
case CNMAP_CHANNEL_RED:
|
|
case CNMAP_CHANNEL_GREEN:
|
|
case CNMAP_CHANNEL_BLUE:
|
|
case CNMAP_CHANNEL_ALPHA:
|
|
case CNMAP_CHANNEL_LUMINANCE:
|
|
break;
|
|
|
|
default:
|
|
return E_INVALIDARG;
|
|
}
|
|
|
|
normalMaps.Release();
|
|
|
|
TexMetadata mdata2 = metadata;
|
|
mdata2.format = format;
|
|
HRESULT hr = normalMaps.Initialize(mdata2);
|
|
if (FAILED(hr))
|
|
return hr;
|
|
|
|
if (nimages != normalMaps.GetImageCount())
|
|
{
|
|
normalMaps.Release();
|
|
return E_FAIL;
|
|
}
|
|
|
|
const Image* dest = normalMaps.GetImages();
|
|
if (!dest)
|
|
{
|
|
normalMaps.Release();
|
|
return E_POINTER;
|
|
}
|
|
|
|
for (size_t index = 0; index < nimages; ++index)
|
|
{
|
|
assert(dest[index].format == format);
|
|
|
|
const Image& src = srcImages[index];
|
|
if (IsCompressed(src.format) || IsTypeless(src.format))
|
|
{
|
|
normalMaps.Release();
|
|
return HRESULT_FROM_WIN32(ERROR_NOT_SUPPORTED);
|
|
}
|
|
|
|
if (src.width != dest[index].width || src.height != dest[index].height)
|
|
{
|
|
normalMaps.Release();
|
|
return E_FAIL;
|
|
}
|
|
|
|
hr = ComputeNMap(src, flags, amplitude, format, dest[index]);
|
|
if (FAILED(hr))
|
|
{
|
|
normalMaps.Release();
|
|
return hr;
|
|
}
|
|
}
|
|
|
|
return S_OK;
|
|
}
|