resolve_timestamp()

ShaderFoundry::TimestampResult MayaFlux::Portal::Graphics::ShaderFoundry::resolve_timestamp ( const CommandBufferState &  state, const std::string &  label, bool  wait  )

private

Definition at line 1452 of file ShaderFoundry.cpp.

{
    auto query_it = state.timestamp_queries.find(label);
    if (query_it == state.timestamp_queries.end() || !state.timestamp_pool) {
        return { .label = label, .duration_ns = 0, .valid = false };
    }
 
    uint32_t query_index = query_it->second;
    uint64_t timestamps[2];
 
    vk::QueryResultFlags flags = vk::QueryResultFlagBits::e64;
    if (wait) {
        flags |= vk::QueryResultFlagBits::eWait;
    }
 
    auto result = get_device().getQueryPoolResults(
        state.timestamp_pool,
        query_index,
        2,
        sizeof(timestamps),
        timestamps,
        sizeof(uint64_t),
        flags);
 
    if (result != vk::Result::eSuccess) {
        return { .label = label, .duration_ns = 0, .valid = false };
    }
 
    auto props = m_backend->get_context().get_physical_device().getProperties();
    float timestamp_period = props.limits.timestampPeriod;
 
    auto duration_ns = static_cast<uint64_t>((timestamps[1] - timestamps[0]) * timestamp_period);
 
    return { .label = label, .duration_ns = duration_ns, .valid = true };
}

References get_device(), label, m_backend, MayaFlux::Portal::Graphics::ShaderFoundry::CommandBufferState::timestamp_pool, and MayaFlux::Portal::Graphics::ShaderFoundry::CommandBufferState::timestamp_queries.

Referenced by get_timestamp_result(), and submit_and_wait().

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