vi: fix confusion between closing and destroying layers

src/core/hle/service/nvnflinger/fb_share_buffer_manager.cpp

@@ -204,8 +204,9 @@ Result FbShareBufferManager::Initialize(u64* out_buffer_id, u64* out_layer_id, u
     // Record the display id.
     m_display_id = display_id;
 
-    // Create a layer for the display.
+    // Create and open a layer for the display.
     m_layer_id = m_flinger.CreateLayer(m_display_id).value();
+    m_flinger.OpenLayer(m_layer_id);
 
     // Set up the buffer.
     m_buffer_id = m_next_buffer_id++;

src/core/hle/service/nvnflinger/nvnflinger.cpp

@@ -176,17 +176,37 @@ void Nvnflinger::CreateLayerAtId(VI::Display& display, u64 layer_id) {
     display.CreateLayer(layer_id, buffer_id, nvdrv->container);
 }
 
+void Nvnflinger::OpenLayer(u64 layer_id) {
+    const auto lock_guard = Lock();
+
+    for (auto& display : displays) {
+        if (auto* layer = display.FindLayer(layer_id); layer) {
+            layer->Open();
+        }
+    }
+}
+
 void Nvnflinger::CloseLayer(u64 layer_id) {
     const auto lock_guard = Lock();
 
     for (auto& display : displays) {
-        display.CloseLayer(layer_id);
+        if (auto* layer = display.FindLayer(layer_id); layer) {
+            layer->Close();
+        }
+    }
+}
+
+void Nvnflinger::DestroyLayer(u64 layer_id) {
+    const auto lock_guard = Lock();
+
+    for (auto& display : displays) {
+        display.DestroyLayer(layer_id);
     }
 }
 
 std::optional<u32> Nvnflinger::FindBufferQueueId(u64 display_id, u64 layer_id) {
     const auto lock_guard = Lock();
-    const auto* const layer = FindOrCreateLayer(display_id, layer_id);
+    const auto* const layer = FindLayer(display_id, layer_id);
 
     if (layer == nullptr) {
         return std::nullopt;
@@ -240,24 +260,6 @@ VI::Layer* Nvnflinger::FindLayer(u64 display_id, u64 layer_id) {
     return display->FindLayer(layer_id);
 }
 
-VI::Layer* Nvnflinger::FindOrCreateLayer(u64 display_id, u64 layer_id) {
-    auto* const display = FindDisplay(display_id);
-
-    if (display == nullptr) {
-        return nullptr;
-    }
-
-    auto* layer = display->FindLayer(layer_id);
-
-    if (layer == nullptr) {
-        LOG_DEBUG(Service_Nvnflinger, "Layer at id {} not found. Trying to create it.", layer_id);
-        CreateLayerAtId(*display, layer_id);
-        return display->FindLayer(layer_id);
-    }
-
-    return layer;
-}
-
 void Nvnflinger::Compose() {
     for (auto& display : displays) {
         // Trigger vsync for this display at the end of drawing

src/core/hle/service/nvnflinger/nvnflinger.h

@@ -73,9 +73,15 @@ public:
     /// If an invalid display ID is specified, then an empty optional is returned.
     [[nodiscard]] std::optional<u64> CreateLayer(u64 display_id);
 
+    /// Opens a layer on all displays for the given layer ID.
+    void OpenLayer(u64 layer_id);
+
     /// Closes a layer on all displays for the given layer ID.
     void CloseLayer(u64 layer_id);
 
+    /// Destroys the given layer ID.
+    void DestroyLayer(u64 layer_id);
+
     /// Finds the buffer queue ID of the specified layer in the specified display.
     ///
     /// If an invalid display ID or layer ID is provided, then an empty optional is returned.
@@ -117,11 +123,6 @@ private:
     /// Finds the layer identified by the specified ID in the desired display.
     [[nodiscard]] VI::Layer* FindLayer(u64 display_id, u64 layer_id);
 
-    /// Finds the layer identified by the specified ID in the desired display,
-    /// or creates the layer if it is not found.
-    /// To be used when the system expects the specified ID to already exist.
-    [[nodiscard]] VI::Layer* FindOrCreateLayer(u64 display_id, u64 layer_id);
-
     /// Creates a layer with the specified layer ID in the desired display.
     void CreateLayerAtId(VI::Display& display, u64 layer_id);
 

src/core/hle/service/vi/display/vi_display.cpp

@@ -51,11 +51,24 @@ Display::~Display() {
 }
 
 Layer& Display::GetLayer(std::size_t index) {
-    return *layers.at(index);
+    size_t i = 0;
+    for (auto& layer : layers) {
+        if (!layer->IsOpen()) {
+            continue;
+        }
+
+        if (i == index) {
+            return *layer;
+        }
+
+        i++;
+    }
+
+    UNREACHABLE();
 }
 
-const Layer& Display::GetLayer(std::size_t index) const {
-    return *layers.at(index);
+size_t Display::GetNumLayers() const {
+    return std::ranges::count_if(layers, [](auto& l) { return l->IsOpen(); });
 }
 
 Result Display::GetVSyncEvent(Kernel::KReadableEvent** out_vsync_event) {
@@ -92,7 +105,11 @@ void Display::CreateLayer(u64 layer_id, u32 binder_id,
     hos_binder_driver_server.RegisterProducer(std::move(producer));
 }
 
-void Display::CloseLayer(u64 layer_id) {
+void Display::DestroyLayer(u64 layer_id) {
+    if (auto* layer = this->FindLayer(layer_id); layer != nullptr) {
+        layer->GetConsumer().Abandon();
+    }
+
     std::erase_if(layers,
                   [layer_id](const auto& layer) { return layer->GetLayerId() == layer_id; });
 }

src/core/hle/service/vi/display/vi_display.h

@@ -66,18 +66,13 @@ public:
 
     /// Whether or not this display has any layers added to it.
     bool HasLayers() const {
-        return !layers.empty();
+        return GetNumLayers() > 0;
     }
 
     /// Gets a layer for this display based off an index.
     Layer& GetLayer(std::size_t index);
 
-    /// Gets a layer for this display based off an index.
-    const Layer& GetLayer(std::size_t index) const;
-
-    std::size_t GetNumLayers() const {
-        return layers.size();
-    }
+    std::size_t GetNumLayers() const;
 
     /**
      * Gets the internal vsync event.
@@ -100,11 +95,11 @@ public:
     ///
     void CreateLayer(u64 layer_id, u32 binder_id, Service::Nvidia::NvCore::Container& core);
 
-    /// Closes and removes a layer from this display with the given ID.
+    /// Removes a layer from this display with the given ID.
     ///
-    /// @param layer_id The ID assigned to the layer to close.
+    /// @param layer_id The ID assigned to the layer to destroy.
     ///
-    void CloseLayer(u64 layer_id);
+    void DestroyLayer(u64 layer_id);
 
     /// Resets the display for a new connection.
     void Reset() {

src/core/hle/service/vi/layer/vi_layer.cpp

@@ -8,8 +8,8 @@ namespace Service::VI {
 Layer::Layer(u64 layer_id_, u32 binder_id_, android::BufferQueueCore& core_,
              android::BufferQueueProducer& binder_,
              std::shared_ptr<android::BufferItemConsumer>&& consumer_)
-    : layer_id{layer_id_}, binder_id{binder_id_}, core{core_}, binder{binder_}, consumer{std::move(
-                                                                                    consumer_)} {}
+    : layer_id{layer_id_}, binder_id{binder_id_}, core{core_}, binder{binder_},
+      consumer{std::move(consumer_)}, open{false} {}
 
 Layer::~Layer() = default;
 

src/core/hle/service/vi/layer/vi_layer.h

@@ -71,12 +71,25 @@ public:
         return core;
     }
 
+    bool IsOpen() const {
+        return open;
+    }
+
+    void Close() {
+        open = false;
+    }
+
+    void Open() {
+        open = true;
+    }
+
 private:
     const u64 layer_id;
     const u32 binder_id;
     android::BufferQueueCore& core;
     android::BufferQueueProducer& binder;
     std::shared_ptr<android::BufferItemConsumer> consumer;
+    bool open;
 };
 
 } // namespace Service::VI

src/core/hle/service/vi/vi.cpp

@@ -719,6 +719,8 @@ private:
             return;
         }
 
+        nv_flinger.OpenLayer(layer_id);
+
         android::OutputParcel parcel;
         parcel.WriteInterface(NativeWindow{*buffer_queue_id});
 
@@ -783,6 +785,7 @@ private:
         const u64 layer_id = rp.Pop<u64>();
 
         LOG_WARNING(Service_VI, "(STUBBED) called. layer_id=0x{:016X}", layer_id);
+        nv_flinger.DestroyLayer(layer_id);
 
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(ResultSuccess);