ios_context.mm

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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 "flutter/shell/platform/darwin/ios/ios_context.h"
#include <memory>
#include "flutter/shell/platform/darwin/ios/rendering_api_selection.h"
 
#include "flutter/fml/logging.h"
#include "flutter/shell/platform/darwin/ios/ios_context_metal_impeller.h"
#include "flutter/shell/platform/darwin/ios/ios_context_metal_skia.h"
#include "flutter/shell/platform/darwin/ios/ios_context_noop.h"
#include "flutter/shell/platform/darwin/ios/ios_context_software.h"
 
FLUTTER_ASSERT_ARC
 
namespace flutter {
 
IOSContext::IOSContext() = default;
 
IOSContext::~IOSContext() = default;
 
std::unique_ptr<IOSContext> IOSContext::Create(
    IOSRenderingAPI api,
    IOSRenderingBackend backend,
    const std::shared_ptr<const fml::SyncSwitch>& is_gpu_disabled_sync_switch) {
  switch (api) {
    case IOSRenderingAPI::kSoftware:
      if (backend == IOSRenderingBackend::kImpeller) {
        FML_LOG(IMPORTANT)
            << "Software rendering is incompatible with Impeller.\n"
               "Software rendering may have been automatically selected when running on a "
               "simulator "
               "in an environment that does not support Metal. Enabling GPU passthrough in your "
               "environment may fix this.";
        return std::make_unique<IOSContextNoop>();
      }
      return std::make_unique<IOSContextSoftware>();
    case IOSRenderingAPI::kMetal:
      switch (backend) {
        case IOSRenderingBackend::kSkia:
#if !SLIMPELLER
          return std::make_unique<IOSContextMetalSkia>();
#else   //  !SLIMPELLER
          FML_LOG(FATAL) << "Impeller opt-out unavailable.";
          return nullptr;
#endif  //  !SLIMPELLER
        case IOSRenderingBackend::kImpeller:
          return std::make_unique<IOSContextMetalImpeller>(is_gpu_disabled_sync_switch);
      }
    default:
      break;
  }
  FML_CHECK(false);
  return nullptr;
}
 
IOSRenderingBackend IOSContext::GetBackend() const {
  return IOSRenderingBackend::kSkia;
}
 
std::shared_ptr<impeller::Context> IOSContext::GetImpellerContext() const {
  return nullptr;
}
 
std::shared_ptr<impeller::AiksContext> IOSContext::GetAiksContext() const {
  return nullptr;
}
 
}  // namespace flutter