write_grid_extent_constants()

void MayaFlux::Buffers::RelaxationStepProcessor::write_grid_extent_constants ( )

private

Size the push constant block to at least GridExtent and write the attached grid's dimensions into its leading 8 bytes.

Called from on_attach. A ShaderSpec-constructed processor keeps the size spec.push_constant_bytes gave it. Bytes past sizeof(GridExtent) are rule constants, written by RelaxationGridBuffer from GridConfig::Stage::constants, or per cycle by ShaderProcessor::feed at an explicit offset. set_push_constant_data_raw is unsuitable: it writes from offset 0 and resizes the block to the size passed.

Definition at line 73 of file RelaxationStepProcessor.cpp.

{
    if (m_config.push_constant_size < sizeof(GridExtent)) {
        set_push_constant_size(sizeof(GridExtent));
    }
 
    auto& data = get_push_constant_data();
    if (data.size() < m_config.push_constant_size) {
        data.resize(m_config.push_constant_size);
    }
 
    const GridExtent extent {
        .width = m_grid->get_grid_width(),
        .height = m_grid->get_grid_height()
    };
    std::memcpy(data.data(), &extent, sizeof(GridExtent));
}

References MayaFlux::Buffers::ShaderProcessor::get_push_constant_data(), MayaFlux::Buffers::ShaderProcessor::m_config, m_grid, MayaFlux::Buffers::ShaderConfig::push_constant_size, MayaFlux::Buffers::ShaderProcessor::set_push_constant_size(), and MayaFlux::Buffers::RelaxationStepProcessor::GridExtent::width.

Referenced by on_attach().

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