src/ui/lib/escher/vk/vulkan_swapchain_helper.h

// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SRC_UI_LIB_ESCHER_VK_VULKAN_SWAPCHAIN_HELPER_H_
#define SRC_UI_LIB_ESCHER_VK_VULKAN_SWAPCHAIN_HELPER_H_

#include <lib/fit/function.h>

#include "src/ui/lib/escher/forward_declarations.h"
#include "src/ui/lib/escher/vk/vulkan_swapchain.h"

namespace escher {

class VulkanSwapchainHelper {
 public:
  using DrawFrameCallback =
      fit::function<void(const ImagePtr& output_image, const SemaphorePtr& framebuffer_acquired,
                         const SemaphorePtr& render_finished)>;

  VulkanSwapchainHelper(VulkanSwapchain swapchain, vk::Device device, vk::Queue queue);
  ~VulkanSwapchainHelper();

  // Obtains an output image from the swapchain, draws a frame by invoking
  // |callback|, and presents the image.
  void DrawFrame(DrawFrameCallback callback);

  const VulkanSwapchain& swapchain() const { return swapchain_; }

 private:
  VulkanSwapchain swapchain_;
  vk::Device device_;
  vk::Queue queue_;

  size_t next_semaphore_index_ = 0;
  std::vector<SemaphorePtr> image_available_semaphores_;
  std::vector<SemaphorePtr> render_finished_semaphores_;

  FXL_DISALLOW_COPY_AND_ASSIGN(VulkanSwapchainHelper);
};

}  // namespace escher

#endif  // SRC_UI_LIB_ESCHER_VK_VULKAN_SWAPCHAIN_HELPER_H_