gpu_block_layout()

MAYAFLUX_API GpuBlockLayout MayaFlux::Kakshya::gpu_block_layout

(

std::span< const GpuDataFormat >

fields

)

Lay out fields in declaration order under std430 rules.

Each offset is the running end rounded up to the field's alignment, and the size is the end rounded up to the widest alignment, never less than four. This is the layout Vulkan applies to push constant blocks, which the GLSL path leaves to the compiler and the SPIR-V path must state itself.

Parameters

fields

Field formats in declaration order.

Returns

One offset per field. Unrecognised formats take no space and report the current end as their offset.

Definition at line 88 of file GpuDataFormat.cpp.

{
    GpuBlockLayout layout;
    layout.offsets.reserve(fields.size());
 
    size_t end = 0;
    size_t widest = 4;
    for (const GpuDataFormat field : fields) {
        const size_t align = gpu_data_format_align(field);
        if (align == 0) {
            layout.offsets.push_back(static_cast<uint32_t>(end));
            continue;
        }
 
        end = (end + align - 1) / align * align;
        layout.offsets.push_back(static_cast<uint32_t>(end));
        end += gpu_data_format_bytes(field);
        widest = std::max(widest, align);
    }
 
    layout.size = static_cast<uint32_t>((end + widest - 1) / widest * widest);
    return layout;
}

References gpu_data_format_align(), gpu_data_format_bytes(), MayaFlux::Kakshya::GpuBlockLayout::offsets, and MayaFlux::Kakshya::GpuBlockLayout::size.

Referenced by MayaFlux::Portal::Graphics::push_constant_layout().

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