android_context_vk_impeller.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 "flutter/shell/platform/android/android_context_vk_impeller.h"
 
#include "flutter/fml/logging.h"
#include "flutter/fml/paths.h"
#include "flutter/impeller/entity/vk/entity_shaders_vk.h"
#include "flutter/impeller/entity/vk/framebuffer_blend_shaders_vk.h"
#include "flutter/impeller/entity/vk/modern_shaders_vk.h"
#include "flutter/impeller/renderer/backend/vulkan/context_vk.h"
#include "shell/platform/android/android_rendering_selector.h"
#include "shell/platform/android/context/android_context.h"
 
namespace flutter {
 
static std::shared_ptr<impeller::Context> CreateImpellerContext(
    const fml::RefPtr<fml::NativeLibrary>& vulkan_dylib,
    const AndroidContext::ContextSettings& p_settings) {
  if (!vulkan_dylib) {
    VALIDATION_LOG << "Could not open the Vulkan dylib.";
    return nullptr;
  }
 
  std::vector<std::shared_ptr<fml::Mapping>> shader_mappings = {
      std::make_shared<fml::NonOwnedMapping>(impeller_entity_shaders_vk_data,
                                             impeller_entity_shaders_vk_length),
      std::make_shared<fml::NonOwnedMapping>(
          impeller_framebuffer_blend_shaders_vk_data,
          impeller_framebuffer_blend_shaders_vk_length),
      std::make_shared<fml::NonOwnedMapping>(impeller_modern_shaders_vk_data,
                                             impeller_modern_shaders_vk_length),
  };
 
  auto instance_proc_addr =
      vulkan_dylib->ResolveFunction<PFN_vkGetInstanceProcAddr>(
          "vkGetInstanceProcAddr");
 
  if (!instance_proc_addr.has_value()) {
    VALIDATION_LOG << "Could not setup Vulkan proc table.";
    return nullptr;
  }
 
  impeller::ContextVK::Settings settings;
  settings.proc_address_callback = instance_proc_addr.value();
  settings.shader_libraries_data = std::move(shader_mappings);
  settings.cache_directory = fml::paths::GetCachesDirectory();
  settings.enable_validation = p_settings.enable_validation;
  settings.enable_gpu_tracing = p_settings.enable_gpu_tracing;
  settings.enable_surface_control = p_settings.enable_surface_control;
  settings.flags = p_settings.impeller_flags;
 
  auto context = impeller::ContextVK::Create(std::move(settings));
 
  if (!p_settings.quiet) {
    if (context && impeller::CapabilitiesVK::Cast(*context->GetCapabilities())
                       .AreValidationsEnabled()) {
      FML_LOG(IMPORTANT) << "Using the Impeller rendering backend (Vulkan with "
                            "Validation Layers).";
    } else {
      FML_LOG(IMPORTANT) << "Using the Impeller rendering backend (Vulkan).";
    }
  }
  if (context && context->GetDriverInfo()->IsKnownBadDriver()) {
    FML_LOG(INFO)
        << "Known bad Vulkan driver encountered, falling back to OpenGLES.";
    return nullptr;
  }
 
  return context;
}
 
AndroidContextVKImpeller::AndroidContextVKImpeller(
    const AndroidContext::ContextSettings& settings)
    : AndroidContext(AndroidRenderingAPI::kImpellerVulkan),
      vulkan_dylib_(fml::NativeLibrary::Create("libvulkan.so")) {
  auto impeller_context = CreateImpellerContext(vulkan_dylib_, settings);
  is_valid_ = !!impeller_context;
  SetImpellerContext(impeller_context);
}
 
AndroidContextVKImpeller::~AndroidContextVKImpeller() = default;
 
bool AndroidContextVKImpeller::IsValid() const {
  return is_valid_;
}
 
AndroidRenderingAPI AndroidContextVKImpeller::RenderingApi() const {
  return AndroidRenderingAPI::kImpellerVulkan;
}
 
}  // namespace flutter