service/vi/vi_layer: Convert Layer struct into a class

Like the previous changes made to the Display struct, this prepares the
Layer struct for changes to its interface. Given Layer will be given
more invariants in the future, we convert it into a class to better
signify that.

6 files changed, 43 insertions, 10 deletions

diff --git a/src/core/hle/service/nvflinger/nvflinger.cpp b/src/core/hle/service/nvflinger/nvflinger.cpp
index 6cc31050f..95bb55bbb 100644
--- a/src/core/hle/service/nvflinger/nvflinger.cpp
+++ b/src/core/hle/service/nvflinger/nvflinger.cpp
@@ -91,7 +91,7 @@ std::optional<u32> NVFlinger::FindBufferQueueId(u64 display_id, u64 layer_id) co
         return {};
     }
 
-    return layer->buffer_queue->GetId();
+    return layer->GetBufferQueue().GetId();
 }
 
 Kernel::SharedPtr<Kernel::ReadableEvent> NVFlinger::FindVsyncEvent(u64 display_id) const {
@@ -167,10 +167,10 @@ void NVFlinger::Compose() {
 
         // TODO(Subv): Support more than 1 layer.
         VI::Layer& layer = display.GetLayer(0);
-        auto& buffer_queue = layer.buffer_queue;
+        auto& buffer_queue = layer.GetBufferQueue();
 
         // Search for a queued buffer and acquire it
-        auto buffer = buffer_queue->AcquireBuffer();
+        auto buffer = buffer_queue.AcquireBuffer();
 
         MicroProfileFlip();
 
@@ -195,7 +195,7 @@ void NVFlinger::Compose() {
                      igbp_buffer.width, igbp_buffer.height, igbp_buffer.stride,
                      buffer->get().transform, buffer->get().crop_rect);
 
-        buffer_queue->ReleaseBuffer(buffer->get().slot);
+        buffer_queue.ReleaseBuffer(buffer->get().slot);
     }
 }
 
diff --git a/src/core/hle/service/nvflinger/nvflinger.h b/src/core/hle/service/nvflinger/nvflinger.h
index 4741b1363..f9458745a 100644
--- a/src/core/hle/service/nvflinger/nvflinger.h
+++ b/src/core/hle/service/nvflinger/nvflinger.h
@@ -29,7 +29,7 @@ class Module;
 
 namespace Service::VI {
 class Display;
-struct Layer;
+class Layer;
 } // namespace Service::VI
 
 namespace Service::NVFlinger {
diff --git a/src/core/hle/service/vi/display/vi_display.cpp b/src/core/hle/service/vi/display/vi_display.cpp
index 4d77c3353..9c0afd152 100644
--- a/src/core/hle/service/vi/display/vi_display.cpp
+++ b/src/core/hle/service/vi/display/vi_display.cpp
@@ -48,7 +48,7 @@ void Display::CreateLayer(u64 id, std::shared_ptr<NVFlinger::BufferQueue> buffer
 
 Layer* Display::FindLayer(u64 id) {
     const auto itr = std::find_if(layers.begin(), layers.end(),
-                                  [id](const VI::Layer& layer) { return layer.id == id; });
+                                  [id](const VI::Layer& layer) { return layer.GetID() == id; });
 
     if (itr == layers.end()) {
         return nullptr;
@@ -59,7 +59,7 @@ Layer* Display::FindLayer(u64 id) {
 
 const Layer* Display::FindLayer(u64 id) const {
     const auto itr = std::find_if(layers.begin(), layers.end(),
-                                  [id](const VI::Layer& layer) { return layer.id == id; });
+                                  [id](const VI::Layer& layer) { return layer.GetID() == id; });
 
     if (itr == layers.end()) {
         return nullptr;
diff --git a/src/core/hle/service/vi/display/vi_display.h b/src/core/hle/service/vi/display/vi_display.h
index 22b831592..8948102bc 100644
--- a/src/core/hle/service/vi/display/vi_display.h
+++ b/src/core/hle/service/vi/display/vi_display.h
@@ -16,7 +16,7 @@ class BufferQueue;
 
 namespace Service::VI {
 
-struct Layer;
+class Layer;
 
 /// Represents a single display type
 class Display {
diff --git a/src/core/hle/service/vi/layer/vi_layer.cpp b/src/core/hle/service/vi/layer/vi_layer.cpp
index 3a83e5b95..48f4c57cb 100644
--- a/src/core/hle/service/vi/layer/vi_layer.cpp
+++ b/src/core/hle/service/vi/layer/vi_layer.cpp
@@ -2,12 +2,16 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include "common/assert.h"
 #include "core/hle/service/vi/layer/vi_layer.h"
 
 namespace Service::VI {
 
 Layer::Layer(u64 id, std::shared_ptr<NVFlinger::BufferQueue> queue)
-    : id{id}, buffer_queue{std::move(queue)} {}
+    : id{id}, buffer_queue{std::move(queue)}
+{
+    ASSERT_MSG(buffer_queue != nullptr, "buffer_queue may not be null.");
+}
 
 Layer::~Layer() = default;
 
diff --git a/src/core/hle/service/vi/layer/vi_layer.h b/src/core/hle/service/vi/layer/vi_layer.h
index df328e09f..dd4f7e596 100644
--- a/src/core/hle/service/vi/layer/vi_layer.h
+++ b/src/core/hle/service/vi/layer/vi_layer.h
@@ -14,10 +14,39 @@ class BufferQueue;
 
 namespace Service::VI {
 
-struct Layer {
+/// Represents a single display layer.
+class Layer {
+public:
+    /// Constructs a layer with a given ID and buffer queue.
+    ///
+    /// @param id    The ID to assign to this layer.
+    /// @param queue The buffer queue for this layer to use.
+    ///
     Layer(u64 id, std::shared_ptr<NVFlinger::BufferQueue> queue);
     ~Layer();
 
+    Layer(const Layer&) = delete;
+    Layer& operator=(const Layer&) = delete;
+
+    Layer(Layer&&) = default;
+    Layer& operator=(Layer&&) = default;
+
+    /// Gets the ID for this layer.
+    u64 GetID() const {
+        return id;
+    }
+
+    /// Gets a reference to the buffer queue this layer is using.
+    NVFlinger::BufferQueue& GetBufferQueue() {
+        return *buffer_queue;
+    }
+
+    /// Gets a const reference to the buffer queue this layer is using.
+    const NVFlinger::BufferQueue& GetBufferQueue() const {
+        return *buffer_queue;
+    }
+
+private:
     u64 id;
     std::shared_ptr<NVFlinger::BufferQueue> buffer_queue;
 };