find_word_offset()

std::optional< uint32_t > MayaFlux::Kakshya::VertexLayout::find_word_offset ( DataModality  modality ) const

inline

Word offset of the attribute matching the given modality, if any.

Parameters

modality

Attribute kind to search for, e.g. DataModality::VERTEX_POSITIONS_3D or VERTEX_COLORS_RGB.

Returns

Byte offset divided by 4, or nullopt when no attribute of that modality is present or its offset is not word-aligned.

The alignment check exists for GPU code addressing this record as a flat float/uint array rather than through a struct: GpuFieldOperator and the particle spatial hash both index by word, not byte.

Definition at line 70 of file VertexLayout.hpp.

    {
        for (const auto& attr : attributes) {
            if (attr.component_modality == modality) {
                if (attr.offset_in_vertex % 4 != 0) {
                    return std::nullopt;
                }
                return attr.offset_in_vertex / 4;
            }
        }
        return std::nullopt;
    }

References attributes.