vulkan-wsi-layer/wsi/extensions/present_wait.hpp

/*
 * Copyright (c) 2025 Arm Limited.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
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/**
 * @file present_wait.hpp
 *
 * @brief Contains the base class declaration for the VK_KHR_present_wait extension.
 */

#pragma once

#include "wsi_extension.hpp"
#include "present_id.hpp"

#include <vulkan/vulkan.h>

namespace wsi
{

/**
 * @brief Present wait extension class
 *
 * This class defines the present wait extension
 * implementation.
 */
class wsi_ext_present_wait : public wsi_ext
{
public:
   /**
    * @brief The name of the extension.
    */
   WSI_DEFINE_EXTENSION(VK_KHR_PRESENT_WAIT_EXTENSION_NAME);

   /**
    * @brief Constructs present ID class.
    *
    * @param present_id_extension Present ID extension that this class will use to query
    * the last delivered present ID for the swapchain. This extension pointer must outlive
    * this class.
    * @param present_wait2 Indication for using/not using the Present Wait2 extension.
    */
   wsi_ext_present_wait(wsi_ext_present_id &present_id_extension, bool present_wait2);

   /**
    * @brief Waits for present ID to be updated.
    *
    * @param present_id Present ID value to wait for.
    * @param timeout_in_ns Timeout in nanoseconds.
    * @return VK_SUCCESS if present ID value was updated to be above or equal to the requested wait value.
    *         Other error codes otherwise.
    */
   VkResult wait_for_present_id(uint64_t present_id, uint64_t timeout_in_ns);

   /**
    * @brief Getter for the present_wait2.
    */
   bool is_present_wait2() const
   {
      return m_present_wait2;
   };

protected:
   /**
    * @brief Backend specific implementation that will wait for the present ID to
    *        be updated.
    * @param present_id Present ID value to wait for.
    * @param timeout_in_ns Timeout in nanoseconds.
    * @return VK_SUCCESS if present ID value was updated to be above or equal to the requested wait value.
    *         Other error codes otherwise.
    */
   virtual VkResult wait_for_update(uint64_t present_id, uint64_t timeout_in_ns) = 0;

   /**
    * @brief Present ID extension pointer.
    */
   wsi_ext_present_id &m_present_id_ext;

private:
   /**
    * @brief Present Wait2 indication.
    */
   bool m_present_wait2{ false };
};

} /* namespace wsi */