Example error handling flow example

gistfile1.cpp

static void * map_buffer( ID3D11DeviceContext * d3d, HRESULT * hr, ID3D11Buffer * buf, D3D11_MAP map_type )
{
    D3D11_MAPPED_SUBRESOURCE mapped;
    if ( FAILED( *hr ) )
        return NULL;

    *hr = d3d->Map( buf, 0, map_type, 0, &mapped );
    return mapped.pData;
}

void Begin_Update( ID3D11DeviceContext * d3d, BINKGPU_D3D11 * ctx )
{
    HRESULT hr = S_OK;

    U8 * dc_base = (U8 *) map_buffer( d3d, &hr, ctx->dc_buf_in, D3D11_MAP_WRITE_DISCARD );
    U8 * ac_base = (U8 *) map_buffer( d3d, &hr, ctx->ac_buf, D3D11_MAP_WRITE_DISCARD );
    BINKGPUMOVEC * motion_base = (BINKGPUMOVEC *) map_buffer( d3d, &hr, ctx->motion_buf, D3D11_MAP_WRITE_DISCARD );

    if ( FAILED( hr ) )
    {
        if ( dc_base )     d3d->Unmap( ctx->dc_buf_in, 0 );
        if ( ac_base )     d3d->Unmap( ctx->ac_buf, 0 );
        if ( motion_base ) d3d->Unmap( ctx->motion_buf, 0 );
        return;
    }
    
    // ...
}