ahb_swapchain_vk.cc

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "impeller/renderer/backend/vulkan/swapchain/ahb/ahb_swapchain_vk.h"
 
#include "flutter/fml/trace_event.h"
#include "impeller/renderer/backend/vulkan/context_vk.h"
#include "impeller/renderer/backend/vulkan/formats_vk.h"
#include "impeller/renderer/backend/vulkan/swapchain/ahb/ahb_formats.h"
#include "third_party/vulkan-deps/vulkan-headers/src/include/vulkan/vulkan_enums.hpp"
 
namespace impeller {
 
bool AHBSwapchainVK::IsAvailableOnPlatform() {
  return android::SurfaceControl::IsAvailableOnPlatform() &&
         android::HardwareBuffer::IsAvailableOnPlatform();
}
 
AHBSwapchainVK::AHBSwapchainVK(const std::shared_ptr<Context>& context,
                               ANativeWindow* window,
                               const vk::UniqueSurfaceKHR& surface,
                               const ISize& size,
                               bool enable_msaa)
    : context_(context),
      surface_control_(
          std::make_shared<android::SurfaceControl>(window, "ImpellerSurface")),
      enable_msaa_(enable_msaa) {
  const auto [caps_result, surface_caps] =
      ContextVK::Cast(*context).GetPhysicalDevice().getSurfaceCapabilitiesKHR(
          *surface);
  if (caps_result == vk::Result::eSuccess) {
    swapchain_image_count_ =
        std::clamp(surface_caps.minImageCount + 1u,  // preferred image count
                   surface_caps.minImageCount,       // min count cannot be zero
                   surface_caps.maxImageCount == 0u
                       ? surface_caps.minImageCount + 1u
                       : surface_caps.maxImageCount  // max zero means no limit
        );
  }
 
  UpdateSurfaceSize(size);
}
 
AHBSwapchainVK::~AHBSwapchainVK() = default;
 
// |SwapchainVK|
bool AHBSwapchainVK::IsValid() const {
  return impl_ ? impl_->IsValid() : false;
}
 
// |SwapchainVK|
std::unique_ptr<Surface> AHBSwapchainVK::AcquireNextDrawable() {
  if (!IsValid()) {
    return nullptr;
  }
 
  TRACE_EVENT0("impeller", __FUNCTION__);
  return impl_->AcquireNextDrawable();
}
 
// |SwapchainVK|
vk::Format AHBSwapchainVK::GetSurfaceFormat() const {
  return IsValid()
             ? ToVKImageFormat(ToPixelFormat(impl_->GetDescriptor().format))
             : vk::Format::eUndefined;
}
 
// |SwapchainVK|
void AHBSwapchainVK::UpdateSurfaceSize(const ISize& size) {
  if (impl_ && impl_->GetSize() == size) {
    return;
  }
  TRACE_EVENT0("impeller", __FUNCTION__);
  auto impl = AHBSwapchainImplVK::Create(context_,               //
                                         surface_control_,       //
                                         size,                   //
                                         enable_msaa_,           //
                                         swapchain_image_count_  //
  );
  if (!impl || !impl->IsValid()) {
    VALIDATION_LOG << "Could not resize swapchain to size: " << size;
    return;
  }
  impl_ = std::move(impl);
}
 
}  // namespace impeller