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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/gpu/gpu_surface_metal_impeller.h"
#import <Metal/Metal.h>
#import <QuartzCore/QuartzCore.h>
#include "flutter/fml/make_copyable.h"
#include "flutter/fml/mapping.h"
#include "flutter/impeller/display_list/display_list_dispatcher.h"
#include "flutter/impeller/renderer/backend/metal/surface_mtl.h"
static_assert(!__has_feature(objc_arc), "ARC must be disabled.");
namespace flutter {
static std::shared_ptr<impeller::Renderer> CreateImpellerRenderer(
std::shared_ptr<impeller::Context> context) {
auto renderer = std::make_shared<impeller::Renderer>(std::move(context));
if (!renderer->IsValid()) {
FML_LOG(ERROR) << "Could not create valid Impeller Renderer.";
return nullptr;
}
return renderer;
}
GPUSurfaceMetalImpeller::GPUSurfaceMetalImpeller(GPUSurfaceMetalDelegate* delegate,
std::shared_ptr<impeller::Context> context)
: delegate_(delegate),
impeller_renderer_(CreateImpellerRenderer(context)),
aiks_context_(
std::make_shared<impeller::AiksContext>(impeller_renderer_ ? context : nullptr)) {}
GPUSurfaceMetalImpeller::~GPUSurfaceMetalImpeller() = default;
// |Surface|
bool GPUSurfaceMetalImpeller::IsValid() {
return !!aiks_context_;
}
// |Surface|
std::unique_ptr<SurfaceFrame> GPUSurfaceMetalImpeller::AcquireFrame(const SkISize& frame_info) {
if (!IsValid()) {
FML_LOG(ERROR) << "Metal surface was invalid.";
return nullptr;
}
auto layer = delegate_->GetCAMetalLayer(frame_info);
if (!layer) {
FML_LOG(ERROR) << "Invalid CAMetalLayer given by the embedder.";
return nullptr;
}
auto* mtl_layer = (CAMetalLayer*)layer;
auto surface = impeller::SurfaceMTL::WrapCurrentMetalLayerDrawable(
impeller_renderer_->GetContext(), mtl_layer);
SurfaceFrame::SubmitCallback submit_callback =
fml::MakeCopyable([renderer = impeller_renderer_, //
aiks_context = aiks_context_, //
surface = std::move(surface) //
](SurfaceFrame& surface_frame, SkCanvas* canvas) mutable -> bool {
if (!aiks_context) {
return false;
}
auto display_list = surface_frame.BuildDisplayList();
if (!display_list) {
FML_LOG(ERROR) << "Could not build display list for surface frame.";
return false;
}
impeller::DisplayListDispatcher impeller_dispatcher;
display_list->Dispatch(impeller_dispatcher);
auto picture = impeller_dispatcher.EndRecordingAsPicture();
return renderer->Render(
std::move(surface),
fml::MakeCopyable([aiks_context, picture = std::move(picture)](
impeller::RenderTarget& render_target) -> bool {
return aiks_context->Render(picture, render_target);
}));
});
return std::make_unique<SurfaceFrame>(nullptr, // surface
SurfaceFrame::FramebufferInfo{}, // framebuffer info
submit_callback, // submit callback
nullptr, // context result
true // display list fallback
);
}
// |Surface|
SkMatrix GPUSurfaceMetalImpeller::GetRootTransformation() const {
// This backend does not currently support root surface transformations. Just
// return identity.
return {};
}
// |Surface|
GrDirectContext* GPUSurfaceMetalImpeller::GetContext() {
return nullptr;
}
// |Surface|
std::unique_ptr<GLContextResult> GPUSurfaceMetalImpeller::MakeRenderContextCurrent() {
// This backend has no such concept.
return std::make_unique<GLContextDefaultResult>(true);
}
bool GPUSurfaceMetalImpeller::AllowsDrawingWhenGpuDisabled() const {
return delegate_->AllowsDrawingWhenGpuDisabled();
}
// |Surface|
bool GPUSurfaceMetalImpeller::EnableRasterCache() const {
return false;
}
} // namespace flutter