playground_impl_mtl.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 "impeller/playground/backend/metal/playground_impl_mtl.h"
 
#define GLFW_INCLUDE_NONE
#import "third_party/glfw/include/GLFW/glfw3.h"
 
#define GLFW_EXPOSE_NATIVE_COCOA
#import "third_party/glfw/include/GLFW/glfw3native.h"
 
#include <Metal/Metal.h>
#include <QuartzCore/QuartzCore.h>
 
#include "flutter/fml/mapping.h"
#include "impeller/entity/mtl/entity_shaders.h"
#include "impeller/entity/mtl/framebuffer_blend_shaders.h"
#include "impeller/entity/mtl/modern_shaders.h"
#include "impeller/fixtures/mtl/fixtures_shaders.h"
#include "impeller/fixtures/mtl/modern_fixtures_shaders.h"
#include "impeller/playground/imgui/mtl/imgui_shaders.h"
#include "impeller/renderer/backend/metal/context_mtl.h"
#include "impeller/renderer/backend/metal/formats_mtl.h"
#include "impeller/renderer/backend/metal/surface_mtl.h"
#include "impeller/renderer/backend/metal/texture_mtl.h"
#include "impeller/renderer/mtl/compute_shaders.h"
 
namespace impeller {
 
struct PlaygroundImplMTL::Data {
  CAMetalLayer* metal_layer = nil;
};
 
static std::vector<std::shared_ptr<fml::Mapping>>
ShaderLibraryMappingsForPlayground() {
  return {std::make_shared<fml::NonOwnedMapping>(
              impeller_entity_shaders_data, impeller_entity_shaders_length),
          std::make_shared<fml::NonOwnedMapping>(
              impeller_modern_shaders_data, impeller_modern_shaders_length),
          std::make_shared<fml::NonOwnedMapping>(
              impeller_framebuffer_blend_shaders_data,
              impeller_framebuffer_blend_shaders_length),
          std::make_shared<fml::NonOwnedMapping>(
              impeller_fixtures_shaders_data, impeller_fixtures_shaders_length),
          std::make_shared<fml::NonOwnedMapping>(
              impeller_modern_fixtures_shaders_data,
              impeller_modern_fixtures_shaders_length),
          std::make_shared<fml::NonOwnedMapping>(impeller_imgui_shaders_data,
                                                 impeller_imgui_shaders_length),
          std::make_shared<fml::NonOwnedMapping>(
              impeller_compute_shaders_data, impeller_compute_shaders_length)
 
  };
}
 
void PlaygroundImplMTL::DestroyWindowHandle(WindowHandle handle) {
  if (!handle) {
    return;
  }
  ::glfwDestroyWindow(reinterpret_cast<GLFWwindow*>(handle));
}
 
PlaygroundImplMTL::PlaygroundImplMTL(PlaygroundSwitches switches)
    : PlaygroundImpl(switches),
      handle_(nullptr, &DestroyWindowHandle),
      data_(std::make_unique<Data>()),
      concurrent_loop_(fml::ConcurrentMessageLoop::Create()),
      is_gpu_disabled_sync_switch_(new fml::SyncSwitch(false)) {
  ::glfwDefaultWindowHints();
  ::glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
  ::glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
  auto window = ::glfwCreateWindow(1, 1, "Test", nullptr, nullptr);
  if (!window) {
    return;
  }
 
  auto context = ContextMTL::Create(
      ShaderLibraryMappingsForPlayground(), is_gpu_disabled_sync_switch_,
      "Playground Library",
      switches.enable_wide_gamut
          ? std::optional<PixelFormat>(PixelFormat::kB10G10R10A10XR)
          : std::nullopt);
  if (!context) {
    return;
  }
  NSWindow* cocoa_window = ::glfwGetCocoaWindow(window);
  if (cocoa_window == nil) {
    return;
  }
  data_->metal_layer = [CAMetalLayer layer];
  data_->metal_layer.device = ContextMTL::Cast(*context).GetMTLDevice();
  data_->metal_layer.pixelFormat =
      ToMTLPixelFormat(context->GetCapabilities()->GetDefaultColorFormat());
  data_->metal_layer.framebufferOnly = NO;
  cocoa_window.contentView.layer = data_->metal_layer;
  cocoa_window.contentView.wantsLayer = YES;
 
  handle_.reset(window);
  context_ = std::move(context);
}
 
PlaygroundImplMTL::~PlaygroundImplMTL() = default;
 
std::shared_ptr<Context> PlaygroundImplMTL::GetContext() const {
  return context_;
}
 
// |PlaygroundImpl|
PlaygroundImpl::WindowHandle PlaygroundImplMTL::GetWindowHandle() const {
  return handle_.get();
}
 
// |PlaygroundImpl|
std::unique_ptr<Surface> PlaygroundImplMTL::AcquireSurfaceFrame(
    std::shared_ptr<Context> context) {
  if (!data_->metal_layer) {
    return nullptr;
  }
 
  const auto layer_size = data_->metal_layer.bounds.size;
  const auto scale = GetContentScale();
  data_->metal_layer.drawableSize =
      CGSizeMake(layer_size.width * scale.x, layer_size.height * scale.y);
 
  auto drawable =
      SurfaceMTL::GetMetalDrawableAndValidate(context, data_->metal_layer);
  return SurfaceMTL::MakeFromMetalLayerDrawable(context, drawable);
}
 
fml::Status PlaygroundImplMTL::SetCapabilities(
    const std::shared_ptr<Capabilities>& capabilities) {
  context_->SetCapabilities(capabilities);
  return fml::Status();
}
 
}  // namespace impeller