TimestampQueryer.cpp

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/**
* @file TimestampQueryer.cpp.
* @brief The TimestampQuerier Class Implementation.
* @author Spices.
*/
 
#include "Pchheader.h"
#include "TimestampQuerier.h"
#include "Render/Vulkan/VulkanRenderBackend.h"
 
namespace Spices {
 
    TimestampQuerier::TimestampQuerier(VulkanState& state)
        : Querier(StatisticsBits::Timestamp)
    {
        SPICES_PROFILE_ZONE;
 
        m_QueryPool = std::make_unique<VulkanQueryPool>(state, VK_QUERY_TYPE_TIMESTAMP, 2);
        m_Result    = std::make_shared<Result>();
    }
 
    void TimestampQuerier::BeginQuery(VkCommandBuffer commandBuffer)
    {
        SPICES_PROFILE_ZONE;
 
        m_QueryPool->Reset(commandBuffer);
        m_QueryPool->WriteTimeStamp(commandBuffer, 0);
    }
 
    void TimestampQuerier::EndQuery(VkCommandBuffer commandBuffer)
    {
        SPICES_PROFILE_ZONE;
 
        m_QueryPool->WriteTimeStamp(commandBuffer, 1);
    }
 
    void TimestampQuerier::StorePoolResult()
    {
        SPICES_PROFILE_ZONE;
 
        Result* result = static_cast<Result*>(m_Result.get());
 
        uint64_t poolResult[3] = {};
        m_QueryPool->QueryResults(poolResult);
 
        result->valid = poolResult[2];
        result->valid = true;
        if (result->valid)
        {
            // timestampPeriod is the number of nanoseconds per timestamp value increment.
            const float msPerTick = 1e-6f * VulkanDevice::GetDeviceProperties().limits.timestampPeriod;
            result->timeStamp     = msPerTick * (poolResult[1] - poolResult[0]);
        }
    }
}