// static
void D3D11Utils_Texture::copyImageToTexture( const Image4f& im, std::shared_ptr< DynamicTexture2D > tex, bool flipUD )
{
int width = im.width();
int height = im.height();
D3D11_MAPPED_SUBRESOURCE mapping = tex->mapForWriteDiscard();
const float* sourceData = im.pixels();
ubyte* destDataBytes = reinterpret_cast< ubyte* >( mapping.pData );
// if the pitch matches and no flip is requested
// then just directly copy
if( mapping.RowPitch == 4 * width * sizeof( float ) && !flipUD )
{
float* destDataFloat = reinterpret_cast< float* >( mapping.pData );
memcpy( destDataFloat, sourceData, 4 * width * height * sizeof( float ) );
}
// otherwise, have to go row by row
else
{
for( int y = 0; y < height; ++y )
{
int yy = flipUD ? height - y - 1 : y;
const float* sourceRow = &( sourceData[ 4 * yy * width ] );
ubyte* destRow = &( destDataBytes[ y * mapping.RowPitch ] );
memcpy( destRow, sourceRow, 4 * width * sizeof( float ) );
}
}
tex->unmap();
}
// static
void D3D11Utils_Texture::copyTextureToImage( ID3D11Device* pDevice, ID3D11Texture2D* pTexture, Image4f& im )
{
D3D11_TEXTURE2D_DESC desc;
pTexture->GetDesc( &desc );
int width = desc.Width;
int height = desc.Height;
std::shared_ptr< StagingTexture2D > pST;
if( desc.Format == DXGI_FORMAT_R32G32_FLOAT )
{
pST.reset( StagingTexture2D::createFloat2( pDevice, width, height ) );
}
else if( desc.Format == DXGI_FORMAT_R32G32B32A32_FLOAT )
{
pST.reset( StagingTexture2D::createFloat4( pDevice, width, height ) );
}
if( desc.Format == DXGI_FORMAT_R32G32_FLOAT )
{
pST->copyFrom( pTexture );
D3D11_MAPPED_SUBRESOURCE mt = pST->mapForReadWrite();
ubyte* sourceData = reinterpret_cast< ubyte* >( mt.pData );
for( int y = 0; y < height; ++y )
{
float* sourceRow = reinterpret_cast< float* >( &( sourceData[ y * mt.RowPitch ] ) );
for( int x = 0; x < width; ++x )
{
float r = sourceRow[ 2 * x ];
float g = sourceRow[ 2 * x + 1 ];
im.setPixel( x, y, Vector4f( r, g, 0, 1 ) );
}
}
pST->unmap();
}
else if( desc.Format == DXGI_FORMAT_R32G32B32A32_FLOAT )
{
pST->copyFrom( pTexture );
D3D11_MAPPED_SUBRESOURCE mapping = pST->mapForReadWrite();
ubyte* sourceData = reinterpret_cast< ubyte* >( mapping.pData );
if( mapping.RowPitch == 4 * width * sizeof( float ) )
{
memcpy( im.pixels(), sourceData, 4 * width * height * sizeof( float ) );
}
else
{
for( int y = 0; y < height; ++y )
{
float* sourceRow = reinterpret_cast< float* >( &( sourceData[ y * mapping.RowPitch ] ) );
float* destinationRow = im.rowPointer( y );
memcpy( destinationRow, sourceRow, 4 * width * sizeof( float ) );
}
}
pST->unmap();
}
else
{
printf( "Warning: unable to copy texture to image, format is unsupported\n" );
}
}