service: vi: Implement CloseLayer.

- Needed for Undertale.

src/core/hle/service/nvflinger/nvflinger.cpp

@@ -88,6 +88,12 @@ std::optional<u64> NVFlinger::CreateLayer(u64 display_id) {
     return layer_id;
 }
 
+void NVFlinger::CloseLayer(u64 layer_id) {
+    for (auto& display : displays) {
+        display.CloseLayer(layer_id);
+    }
+}
+
 std::optional<u32> NVFlinger::FindBufferQueueId(u64 display_id, u64 layer_id) const {
     const auto* const layer = FindLayer(display_id, layer_id);
 

src/core/hle/service/nvflinger/nvflinger.h

@@ -54,6 +54,9 @@ public:
     /// If an invalid display ID is specified, then an empty optional is returned.
     std::optional<u64> CreateLayer(u64 display_id);
 
+    /// Closes a layer on all displays for the given layer ID.
+    void CloseLayer(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.

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

@@ -24,11 +24,11 @@ Display::Display(u64 id, std::string name, Core::System& system) : id{id}, name{
 Display::~Display() = default;
 
 Layer& Display::GetLayer(std::size_t index) {
-    return layers.at(index);
+    return *layers.at(index);
 }
 
 const Layer& Display::GetLayer(std::size_t index) const {
-    return layers.at(index);
+    return *layers.at(index);
 }
 
 std::shared_ptr<Kernel::ReadableEvent> Display::GetVSyncEvent() const {
@@ -43,29 +43,38 @@ void Display::CreateLayer(u64 id, NVFlinger::BufferQueue& buffer_queue) {
     // TODO(Subv): Support more than 1 layer.
     ASSERT_MSG(layers.empty(), "Only one layer is supported per display at the moment");
 
-    layers.emplace_back(id, buffer_queue);
+    layers.emplace_back(std::make_shared<Layer>(id, buffer_queue));
+}
+
+void Display::CloseLayer(u64 id) {
+    layers.erase(
+        std::remove_if(layers.begin(), layers.end(),
+                       [id](const std::shared_ptr<Layer>& layer) { return layer->GetID() == id; }),
+        layers.end());
 }
 
 Layer* Display::FindLayer(u64 id) {
-    const auto itr = std::find_if(layers.begin(), layers.end(),
-                                  [id](const VI::Layer& layer) { return layer.GetID() == id; });
+    const auto itr =
+        std::find_if(layers.begin(), layers.end(),
+                     [id](const std::shared_ptr<Layer>& layer) { return layer->GetID() == id; });
 
     if (itr == layers.end()) {
         return nullptr;
     }
 
-    return &*itr;
+    return itr->get();
 }
 
 const Layer* Display::FindLayer(u64 id) const {
-    const auto itr = std::find_if(layers.begin(), layers.end(),
-                                  [id](const VI::Layer& layer) { return layer.GetID() == id; });
+    const auto itr =
+        std::find_if(layers.begin(), layers.end(),
+                     [id](const std::shared_ptr<Layer>& layer) { return layer->GetID() == id; });
 
     if (itr == layers.end()) {
         return nullptr;
     }
 
-    return &*itr;
+    return itr->get();
 }
 
 } // namespace Service::VI

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

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -69,6 +70,12 @@ public:
     ///
     void CreateLayer(u64 id, NVFlinger::BufferQueue& buffer_queue);
 
+    /// Closes and removes a layer from this display with the given ID.
+    ///
+    /// @param id           The ID assigned to the layer to close.
+    ///
+    void CloseLayer(u64 id);
+
     /// Attempts to find a layer with the given ID.
     ///
     /// @param id The layer ID.
@@ -91,7 +98,7 @@ private:
     u64 id;
     std::string name;
 
-    std::vector<Layer> layers;
+    std::vector<std::shared_ptr<Layer>> layers;
     Kernel::EventPair vsync_event;
 };
 

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

@@ -1066,6 +1066,18 @@ private:
         rb.Push<u64>(ctx.WriteBuffer(native_window.Serialize()));
     }
 
+    void CloseLayer(Kernel::HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto layer_id{rp.Pop<u64>()};
+
+        LOG_DEBUG(Service_VI, "called. layer_id=0x{:016X}", layer_id);
+
+        nv_flinger->CloseLayer(layer_id);
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(RESULT_SUCCESS);
+    }
+
     void CreateStrayLayer(Kernel::HLERequestContext& ctx) {
         IPC::RequestParser rp{ctx};
         const u32 flags = rp.Pop<u32>();
@@ -1178,7 +1190,7 @@ IApplicationDisplayService::IApplicationDisplayService(
         {1101, &IApplicationDisplayService::SetDisplayEnabled, "SetDisplayEnabled"},
         {1102, &IApplicationDisplayService::GetDisplayResolution, "GetDisplayResolution"},
         {2020, &IApplicationDisplayService::OpenLayer, "OpenLayer"},
-        {2021, nullptr, "CloseLayer"},
+        {2021, &IApplicationDisplayService::CloseLayer, "CloseLayer"},
         {2030, &IApplicationDisplayService::CreateStrayLayer, "CreateStrayLayer"},
         {2031, &IApplicationDisplayService::DestroyStrayLayer, "DestroyStrayLayer"},
         {2101, &IApplicationDisplayService::SetLayerScalingMode, "SetLayerScalingMode"},