AuroraMiddleware/DirectXTex
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Fixed round problem with 32-bit RGBA/BGRA formats

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This commit is contained in:
Chuck Walbourn 2015-07-07 14:25:48 -07:00
parent 4feff1578c
commit 847ab8940a
1 changed files with 17 additions and 1 deletions
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18
DirectXTex/DirectXTexConvert.cpp
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@ -180,6 +180,7 @@ namespace DirectX
static const XMVECTORF32 g_Grayscale = { 0.2125f, 0.7154f, 0.0721f, 0.0f };
static const XMVECTORF32 g_HalfMin = { -65504.f, -65504.f, -65504.f, -65504.f };
static const XMVECTORF32 g_HalfMax = { 65504.f, 65504.f, 65504.f, 65504.f };
static const XMVECTORF32 g_8BitBias = { 0.5f/255.f, 0.5f/255.f, 0.5f/255.f, 0.5f/255.f };
//-------------------------------------------------------------------------------------
// Copies an image row with optional clearing of alpha value to 1.0
@ -1731,7 +1732,18 @@ bool _StoreScanline( LPVOID pDestination, size_t size, DXGI_FORMAT format,
case DXGI_FORMAT_R8G8B8A8_UNORM:
case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
STORE_SCANLINE( XMUBYTEN4, XMStoreUByteN4 )
if ( size >= sizeof(XMUBYTEN4) )
{
XMUBYTEN4 * __restrict dPtr = reinterpret_cast<XMUBYTEN4*>(pDestination);
for( size_t icount = 0; icount < ( size - sizeof(XMUBYTEN4) + 1 ); icount += sizeof(XMUBYTEN4) )
{
if ( sPtr >= ePtr ) break;
XMVECTOR v = XMVectorAdd( *sPtr++, g_8BitBias );
XMStoreUByteN4( dPtr++, v );
}
return true;
}
return false;
case DXGI_FORMAT_R8G8B8A8_UINT:
STORE_SCANLINE( XMUBYTE4, XMStoreUByte4 )
@ -2071,6 +2083,7 @@ bool _StoreScanline( LPVOID pDestination, size_t size, DXGI_FORMAT format,
XMVECTOR v0 = *sPtr++;
XMVECTOR v1 = (sPtr < ePtr) ? XMVectorSplatY( *sPtr++ ) : XMVectorZero();
XMVECTOR v = XMVectorSelect( v1, v0, g_XMSelect1110 );
v = XMVectorAdd( v, g_8BitBias );
XMStoreUByteN4( dPtr++, v );
}
return true;
@ -2089,6 +2102,7 @@ bool _StoreScanline( LPVOID pDestination, size_t size, DXGI_FORMAT format,
XMVECTOR v0 = XMVectorSwizzle<1, 0, 3, 2>( *sPtr++ );
XMVECTOR v1 = (sPtr < ePtr) ? XMVectorSplatY( *sPtr++ ) : XMVectorZero();
XMVECTOR v = XMVectorSelect( v1, v0, select1101 );
v = XMVectorAdd( v, g_8BitBias );
XMStoreUByteN4( dPtr++, v );
}
return true;
@ -2138,6 +2152,7 @@ bool _StoreScanline( LPVOID pDestination, size_t size, DXGI_FORMAT format,
{
if ( sPtr >= ePtr ) break;
XMVECTOR v = XMVectorSwizzle<2, 1, 0, 3>( *sPtr++ );
v = XMVectorAdd( v, g_8BitBias );
XMStoreUByteN4( dPtr++, v );
}
return true;
@ -2153,6 +2168,7 @@ bool _StoreScanline( LPVOID pDestination, size_t size, DXGI_FORMAT format,
{
if ( sPtr >= ePtr ) break;
XMVECTOR v = XMVectorPermute<2, 1, 0, 7>( *sPtr++, g_XMIdentityR3 );
v = XMVectorAdd( v, g_8BitBias );
XMStoreUByteN4( dPtr++, v );
}
return true;