as_mesh_vertex_access()

MAYAFLUX_API std::optional< VertexAccess > MayaFlux::Kakshya::as_mesh_vertex_access	(	const DataVariant &	variant,
		const VertexAccessConfig &	config = {}
	)

Convert DataVariant to mesh-vertex-compatible bytes.

Output layout matches VertexLayout::for_meshes(): stride 60, position (vec3, offset 0), color (vec3, offset 12), weight (float, offset 24), uv (vec2, offset 28), normal (vec3, offset 36), tangent (vec3, offset 48). Compatible with mesh.vert.spv without any user-defined shaders.

Parameters

variant	Source data.
config	Default attribute values (color, weight, uv).

Returns

Populated VertexAccess, or std::nullopt on incompatible type.

Definition at line 347 of file VertexAccess.cpp.

{
    auto positions = extract_positions(variant);
    if (positions.empty()) {
        MF_ERROR(Journal::Component::Kakshya, Journal::Context::Runtime,
            "as_mesh_vertex_access: unsupported or empty variant");
        return std::nullopt;
    }
 
    const auto count = static_cast<uint32_t>(positions.size());
    VertexAccess va;
    va.conversion_buffer.resize((size_t)count * 60);
    write_mesh_vertices(positions, config, va.conversion_buffer.data());
    va.data_ptr = va.conversion_buffer.data();
    va.byte_count = va.conversion_buffer.size();
    va.layout = VertexLayout::for_meshes();
    va.layout.vertex_count = count;
    return va;
}

References MayaFlux::Kakshya::VertexAccess::byte_count, MayaFlux::Kakshya::VertexAccess::conversion_buffer, count, MayaFlux::Kakshya::VertexAccess::data_ptr, MayaFlux::Kakshya::VertexLayout::for_meshes(), MayaFlux::Journal::Kakshya, MayaFlux::Kakshya::VertexAccess::layout, MF_ERROR, MayaFlux::Journal::Runtime, and MayaFlux::Kakshya::VertexLayout::vertex_count.

Referenced by MayaFlux::Buffers::GeometryWriteProcessor::processing_function().

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