Revert "[core/nvnflinger] Revert GetBufferHistory #84 and #528 (#3218)"

This reverts commit 28f08e43

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

@@ -100,6 +100,14 @@ Status BufferQueueConsumer::AcquireBuffer(BufferItem* out_buffer,
         slots[slot].needs_cleanup_on_release = false;
         slots[slot].buffer_state = BufferState::Acquired;
 
+        // Mark tracked buffer history records as acquired
+        for (auto& buffer_history_record : core->buffer_history) {
+            if (buffer_history_record.frame_number == core->frame_counter) {
+                buffer_history_record.state = BufferState::Acquired;
+                break;
+            }
+        }
+
         // TODO: for now, avoid resetting the fence, so that when we next return this
         // slot to the producer, it will wait for the fence to pass. We should fix this
         // by properly waiting for the fence in the BufferItemConsumer.

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

@@ -14,9 +14,18 @@
 namespace Service::android {
 
 BufferQueueCore::BufferQueueCore() = default;
-
 BufferQueueCore::~BufferQueueCore() = default;
 
+void BufferQueueCore::PushHistory(u64 frame_number, s64 queue_time, s64 presentation_time, BufferState state) {
+    buffer_history_pos = (buffer_history_pos + 1) % BUFFER_HISTORY_SIZE;
+    buffer_history[buffer_history_pos] = BufferHistoryInfo{
+        .frame_number = frame_number,
+        .queue_time = queue_time,
+        .presentation_time = presentation_time,
+        .state = state,
+    };
+}
+
 void BufferQueueCore::SignalDequeueCondition() {
     dequeue_possible.store(true);
     dequeue_condition.notify_all();

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

@@ -18,12 +18,29 @@
 
 #include "core/hle/service/nvnflinger/buffer_item.h"
 #include "core/hle/service/nvnflinger/buffer_queue_defs.h"
+#include "core/hle/service/nvnflinger/buffer_slot.h"
 #include "core/hle/service/nvnflinger/pixel_format.h"
 #include "core/hle/service/nvnflinger/status.h"
 #include "core/hle/service/nvnflinger/window.h"
 
 namespace Service::android {
 
+#ifdef _MSC_VER
+#pragma pack(push, 1)
+struct BufferHistoryInfo {
+#elif defined(__GNUC__) || defined(__clang__)
+struct __attribute__((packed)) BufferHistoryInfo {
+#endif
+    u64 frame_number;
+    s64 queue_time;
+    s64 presentation_time;
+    BufferState state;
+};
+#ifdef _MSC_VER
+#pragma pack(pop)
+#endif
+static_assert(sizeof(BufferHistoryInfo) == 0x1C, "BufferHistoryInfo must be 28 bytes");
+
 class IConsumerListener;
 class IProducerListener;
 
@@ -33,10 +50,13 @@ class BufferQueueCore final {
 
 public:
     static constexpr s32 INVALID_BUFFER_SLOT = BufferItem::INVALID_BUFFER_SLOT;
+    static constexpr u32 BUFFER_HISTORY_SIZE = 8;
 
     BufferQueueCore();
     ~BufferQueueCore();
 
+    void PushHistory(u64 frame_number, s64 queue_time, s64 presentation_time, BufferState state);
+
 private:
     void SignalDequeueCondition();
     bool WaitForDequeueCondition(std::unique_lock<std::mutex>& lk);
@@ -72,6 +92,8 @@ private:
     const s32 max_acquired_buffer_count{}; // This is always zero on HOS
     bool buffer_has_been_queued{};
     u64 frame_counter{};
+    std::array<BufferHistoryInfo, BUFFER_HISTORY_SIZE> buffer_history{};
+    u32 buffer_history_pos{BUFFER_HISTORY_SIZE-1};
     u32 transform_hint{};
     bool is_allocating{};
     mutable std::condition_variable_any is_allocating_condition;

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

@@ -515,6 +515,8 @@ Status BufferQueueProducer::QueueBuffer(s32 slot, const QueueBufferInput& input,
         slots[slot].buffer_state = BufferState::Queued;
         ++core->frame_counter;
         slots[slot].frame_number = core->frame_counter;
+        slots[slot].queue_time = timestamp;
+        slots[slot].presentation_time = 0;
 
         item.acquire_called = slots[slot].acquire_called;
         item.graphic_buffer = slots[slot].graphic_buffer;
@@ -547,6 +549,15 @@ Status BufferQueueProducer::QueueBuffer(s32 slot, const QueueBufferInput& input,
                 // mark it as freed
                 if (core->StillTracking(*front)) {
                     slots[front->slot].buffer_state = BufferState::Free;
+
+                    // Mark tracked buffer history records as free
+                    for (auto& buffer_history_record : core->buffer_history) {
+                        if (buffer_history_record.frame_number == front->frame_number) {
+                            buffer_history_record.state = BufferState::Free;
+                            break;
+                        }
+                    }
+
                     // Reset the frame number of the freed buffer so that it is the first in line to
                     // be dequeued again
                     slots[front->slot].frame_number = 0;
@@ -560,6 +571,7 @@ Status BufferQueueProducer::QueueBuffer(s32 slot, const QueueBufferInput& input,
             }
         }
 
+        core->PushHistory(core->frame_counter, slots[slot].queue_time, slots[slot].presentation_time, BufferState::Queued);
         core->buffer_has_been_queued = true;
         core->SignalDequeueCondition();
         output->Inflate(core->default_width, core->default_height, core->transform_hint,
@@ -810,6 +822,10 @@ Status BufferQueueProducer::SetPreallocatedBuffer(s32 slot,
     return Status::NoError;
 }
 
+Kernel::KReadableEvent* BufferQueueProducer::GetNativeHandle(u32 type_id) {
+    return &buffer_wait_event->GetReadableEvent();
+}
+
 void BufferQueueProducer::Transact(u32 code, std::span<const u8> parcel_data,
                                    std::span<u8> parcel_reply, u32 flags) {
     // Values used by BnGraphicBufferProducer onTransact
@@ -929,9 +945,49 @@ void BufferQueueProducer::Transact(u32 code, std::span<const u8> parcel_data,
         status = SetBufferCount(buffer_count);
         break;
     }
-    case TransactionId::GetBufferHistory:
-        LOG_DEBUG(Service_Nvnflinger, "(STUBBED) called, transaction=GetBufferHistory");
+    case TransactionId::GetBufferHistory: {
+        LOG_DEBUG(Service_Nvnflinger, "called, transaction=GetBufferHistory");
+
+        const s32 request = parcel_in.Read<s32>();
+        if (request <= 0) {
+            parcel_out.Write(Status::BadValue);
+            parcel_out.Write<s32>(0);
+            break;
+        }
+
+        constexpr u32 history_max = BufferQueueCore::BUFFER_HISTORY_SIZE;
+        std::array<BufferHistoryInfo, history_max> buffer_history_snapshot{};
+        s32 valid_index{};
+        {
+            std::scoped_lock lk(core->mutex);
+
+            const u32 current_history_pos = core->buffer_history_pos;
+            u32 index_reversed{};
+            for (u32 i = 0; i < history_max; ++i) {
+                // Wrap values backwards e.g. 7, 6, 5, etc. in the range of 0-7
+                index_reversed = (current_history_pos + history_max - i) % history_max;
+                const auto& current_history_buffer = core->buffer_history[index_reversed];
+
+                // Here we use the frame number as a terminator.
+                // Because a buffer without frame_number is not considered complete
+                if (current_history_buffer.frame_number == 0) {
+                    break;
+                }
+
+                buffer_history_snapshot[valid_index] = current_history_buffer;
+                ++valid_index;
+            }
+        }
+
+        const s32 limit = std::min(request, valid_index);
+        parcel_out.Write(Status::NoError);
+        parcel_out.Write<s32>(limit);
+        for (s32 i = 0; i < limit; ++i) {
+            parcel_out.Write(buffer_history_snapshot[i]);
+        }
+
         break;
+    }
     default:
         ASSERT_MSG(false, "Unimplemented TransactionId {}", code);
         break;

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

@@ -89,6 +89,8 @@ private:
     s32 current_callback_ticket{};
     std::condition_variable_any callback_condition;
 
+    u64 position;
+
     Service::Nvidia::NvCore::NvMap& nvmap;
 };
 

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

@@ -37,6 +37,7 @@ struct BufferSlot final {
     bool needs_cleanup_on_release{};
     bool attached_by_consumer{};
     bool is_preallocated{};
+    s64 queue_time{}, presentation_time{};
 };
 
 } // namespace Service::android