Improves small copy handling in TransferData

src/engine/memory/buffers/BufferSuballocationHandle.cpp

@@ -27,6 +27,7 @@ namespace fgl::engine::memory
 	  m_alignment( alignment ),
 	  m_ptr( m_parent_buffer->map( *this ) )
 	{
+		if ( memory_size == 1024 ) throw std::runtime_error( "AAAAA" );
 		// assert( memory_size != 0 && "BufferSuballocation::BufferSuballocation() called with memory_size == 0" );
 	}
 
@@ -40,11 +41,13 @@ namespace fgl::engine::memory
 		m_parent_buffer->free( *this );
 	}
 
-	vk::BufferCopy BufferSuballocationHandle::
-		copyRegion( const BufferSuballocationHandle& target, const std::size_t suballocation_offset ) const
+	vk::BufferCopy BufferSuballocationHandle::copyRegion(
+		const BufferSuballocationHandle& target,
+		const std::size_t suballocation_offset,
+		const vk::DeviceSize size ) const
 	{
 		vk::BufferCopy copy {};
-		copy.size = std::min( this->m_size, target.m_size );
+		copy.size = size == 0 ? std::min( this->m_size, target.m_size ) : size;
 		copy.srcOffset = this->offset();
 		copy.dstOffset = target.offset() + suballocation_offset;
 		return copy;