as_point_vertex_access()

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

Convert DataVariant to point-vertex-compatible bytes.

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

All accepted DataVariant types produce a position per element: GLM types map position directly; scalar and integer types produce a waveform (x=normalised index, y=value, z=0). Color and size are filled from config defaults throughout.

Parameters

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

Returns

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

Definition at line 302 of file VertexAccess.cpp.

{
    auto positions = extract_positions(variant);
    if (positions.empty()) {
        MF_ERROR(Journal::Component::Kakshya, Journal::Context::Runtime,
            "as_point_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_point_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_points();
    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_points(), 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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