get_timestamp_result()

ShaderFoundry::TimestampResult MayaFlux::Portal::Graphics::ShaderFoundry::get_timestamp_result	(	CommandBufferID	cmd_id,
		const std::string &	label
	)

Definition at line 1173 of file ShaderFoundry.cpp.

{
    auto it = m_command_buffers.find(cmd_id);
    if (it == m_command_buffers.end()) {
        return { .label = label, .duration_ns = 0, .valid = false };
    }
 
    auto query_it = it->second.timestamp_queries.find(label);
    if (query_it == it->second.timestamp_queries.end()) {
        return { .label = label, .duration_ns = 0, .valid = false };
    }
 
    if (!it->second.timestamp_pool) {
        return { .label = label, .duration_ns = 0, .valid = false };
    }
 
    uint32_t query_index = query_it->second;
    uint64_t timestamps[2];
 
    auto result = get_device().getQueryPoolResults(
        it->second.timestamp_pool,
        query_index,
        2,
        sizeof(timestamps),
        timestamps,
        sizeof(uint64_t),
        vk::QueryResultFlagBits::e64 | vk::QueryResultFlagBits::eWait);
 
    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(), MayaFlux::Portal::Graphics::ShaderFoundry::TimestampResult::label, m_backend, and m_command_buffers.

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