read_field()

void MayaFlux::Buffers::VolumeGridBuffer::read_field	(	const std::string &	name,
		void *	data,
		size_t	size
	)

Copy the current read slot of a field to host memory.

Parameters

name	Field name.
data	Destination pointer, at least get_field_bytes(name) bytes.
size	Byte count; must equal get_field_bytes(name).

Blocking. Records a fenced device-to-host copy and waits on it from the calling thread. Not for per-frame use on the graphics thread.

Definition at line 605 of file VolumeGridBuffer.cpp.

{
    const auto* field = find_field(name, "read_field");
    if (!field) {
        return;
    }
 
    const size_t expected = static_cast<size_t>(get_cell_count()) * field->stride_bytes;
    if (size != expected) {
        MF_ERROR(Journal::Component::Buffers, Journal::Context::BufferManagement,
            "VolumeGridBuffer::read_field: size {} does not match expected {} for '{}'",
            size, expected, name);
        return;
    }
 
    const uint32_t slot = field->read_is_a ? field->slot_a : field->slot_b;
    resolve_transfer(m_pending_transfer);
    download_back_buffer(get_buffer_resources().back_buffers[slot], data, size, m_transfer_staging);
}

References MayaFlux::Journal::BufferManagement, MayaFlux::Journal::Buffers, MayaFlux::Buffers::download_back_buffer(), find_field(), MayaFlux::Buffers::VKBuffer::get_buffer_resources(), get_cell_count(), m_pending_transfer, m_transfer_staging, MF_ERROR, and MayaFlux::Buffers::resolve_transfer().

Referenced by accumulate().

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