[video_core] simplify InvalidationAccumulator (#3890)

various redundant fields aren't required, so just redo it for good measure

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3890
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

3 files changed, 52 insertions, 76 deletions

diff --git a/src/video_core/invalidation_accumulator.h b/src/video_core/invalidation_accumulator.h
index 2c2aaf7bb0..eb18856932 100644
--- a/src/video_core/invalidation_accumulator.h
+++ b/src/video_core/invalidation_accumulator.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -15,53 +18,37 @@ public:
     InvalidationAccumulator() = default;
     ~InvalidationAccumulator() = default;
 
-    void Add(GPUVAddr address, size_t size) {
-        const auto reset_values = [&]() {
-            if (has_collected) {
+    void Add(GPUVAddr address, size_t size) noexcept {
+        auto const end_address = start_address + accumulated_size;
+        if (!(address >= start_address && address + size <= end_address)) {
+            size = ((address + size + atomicity_size_mask) & atomicity_mask) - address;
+            address = address & atomicity_mask;
+            if (start_address == 0) {
+                start_address = address;
+                accumulated_size = size;
+                // will now have collected as this point
+            } else if (address != end_address) {
                 buffer.emplace_back(start_address, accumulated_size);
+                start_address = address;
+                accumulated_size = size;
+            } else {
+                accumulated_size += size;
             }
-            start_address = address;
-            accumulated_size = size;
-            last_collection = start_address + size;
-        };
-        if (address >= start_address && address + size <= last_collection) [[likely]] {
-            return;
-        }
-        size = ((address + size + atomicity_size_mask) & atomicity_mask) - address;
-        address = address & atomicity_mask;
-        if (!has_collected) [[unlikely]] {
-            reset_values();
-            has_collected = true;
-            return;
         }
-        if (address != last_collection) [[unlikely]] {
-            reset_values();
-            return;
-        }
-        accumulated_size += size;
-        last_collection += size;
-    }
-
-    void Clear() {
-        buffer.clear();
-        start_address = 0;
-        last_collection = 0;
-        has_collected = false;
-    }
-
-    bool AnyAccumulated() const {
-        return has_collected;
     }
 
-    template <typename Func>
-    void Callback(Func&& func) {
-        if (!has_collected) {
-            return;
-        }
-        buffer.emplace_back(start_address, accumulated_size);
-        for (auto& [address, size] : buffer) {
-            func(address, size);
+    template <typename F>
+    [[nodiscard]] bool InvalidateAll(F&& f) noexcept {
+        if (start_address > 0) {
+            for (auto [address, size] : buffer)
+                f(address, size);
+            f(start_address, accumulated_size);
+            buffer.clear();
+            start_address = 0;
+            accumulated_size = 0;
+            return true;
         }
+        return false;
     }
 
 private:
@@ -69,11 +56,9 @@ private:
     static constexpr size_t atomicity_size = 1ULL << atomicity_bits;
     static constexpr size_t atomicity_size_mask = atomicity_size - 1;
     static constexpr size_t atomicity_mask = ~atomicity_size_mask;
-    GPUVAddr start_address{};
-    GPUVAddr last_collection{};
-    size_t accumulated_size{};
-    bool has_collected{};
     std::vector<std::pair<VAddr, size_t>> buffer;
+    GPUVAddr start_address = 0;
+    size_t accumulated_size = 0;
 };
 
 } // namespace VideoCommon
diff --git a/src/video_core/memory_manager.cpp b/src/video_core/memory_manager.cpp
index 41806bfd29..c583fbdf7d 100644
--- a/src/video_core/memory_manager.cpp
+++ b/src/video_core/memory_manager.cpp
@@ -26,16 +26,14 @@ using Tegra::Memory::GuestMemoryFlags;
 
 std::atomic<size_t> MemoryManager::unique_identifier_generator{};
 
-MemoryManager::MemoryManager(Core::System& system_, MaxwellDeviceMemoryManager& memory_,
-                             u64 address_space_bits_, GPUVAddr split_address_, u64 big_page_bits_,
-                             u64 page_bits_)
-    : system{system_}, memory{memory_}, address_space_bits{address_space_bits_},
-      split_address{split_address_}, page_bits{page_bits_}, big_page_bits{big_page_bits_},
-      entries{}, big_entries{}, page_table{address_space_bits, address_space_bits + page_bits - 38,
-                                           page_bits != big_page_bits ? page_bits : 0},
-      kind_map{PTEKind::INVALID}, unique_identifier{unique_identifier_generator.fetch_add(
-                                      1, std::memory_order_acq_rel)},
-      accumulator{std::make_unique<VideoCommon::InvalidationAccumulator>()} {
+MemoryManager::MemoryManager(Core::System& system_, MaxwellDeviceMemoryManager& memory_, u64 address_space_bits_, GPUVAddr split_address_, u64 big_page_bits_, u64 page_bits_)
+    : system{system_}, memory{memory_}, address_space_bits{address_space_bits_}
+    , split_address{split_address_}, page_bits{page_bits_}, big_page_bits{big_page_bits_}
+    , entries{}, big_entries{}
+    , page_table{address_space_bits, address_space_bits + page_bits - 38, page_bits != big_page_bits ? page_bits : 0}
+    , kind_map{PTEKind::INVALID}, unique_identifier{unique_identifier_generator.fetch_add(1, std::memory_order_acq_rel)}
+    , accumulator{}
+{
     address_space_size = 1ULL << address_space_bits;
     page_size = 1ULL << page_bits;
     page_mask = page_size - 1ULL;
@@ -54,10 +52,9 @@ MemoryManager::MemoryManager(Core::System& system_, MaxwellDeviceMemoryManager&
     entries.resize(page_table_size / 32, 0);
 }
 
-MemoryManager::MemoryManager(Core::System& system_, u64 address_space_bits_,
-                             GPUVAddr split_address_, u64 big_page_bits_, u64 page_bits_)
-    : MemoryManager(system_, system_.Host1x().MemoryManager(), address_space_bits_, split_address_,
-                    big_page_bits_, page_bits_) {}
+MemoryManager::MemoryManager(Core::System& system_, u64 address_space_bits_, GPUVAddr split_address_, u64 big_page_bits_, u64 page_bits_)
+    : MemoryManager(system_, system_.Host1x().MemoryManager(), address_space_bits_, split_address_, big_page_bits_, page_bits_)
+{}
 
 MemoryManager::~MemoryManager() = default;
 
@@ -469,10 +466,9 @@ void MemoryManager::WriteBlockUnsafe(GPUVAddr gpu_dest_addr, const void* src_buf
     WriteBlockImpl<false>(gpu_dest_addr, src_buffer, size, VideoCommon::CacheType::None);
 }
 
-void MemoryManager::WriteBlockCached(GPUVAddr gpu_dest_addr, const void* src_buffer,
-                                     std::size_t size) {
+void MemoryManager::WriteBlockCached(GPUVAddr gpu_dest_addr, const void* src_buffer, std::size_t size) {
     WriteBlockImpl<false>(gpu_dest_addr, src_buffer, size, VideoCommon::CacheType::None);
-    accumulator->Add(gpu_dest_addr, size);
+    accumulator.Add(gpu_dest_addr, size);
 }
 
 void MemoryManager::FlushRegion(GPUVAddr gpu_addr, size_t size,
@@ -756,15 +752,13 @@ void MemoryManager::GetSubmappedRangeImpl(
 }
 
 void MemoryManager::FlushCaching() {
-    if (!accumulator->AnyAccumulated()) {
-        return;
-    }
-    accumulator->Callback([this](GPUVAddr addr, size_t size) {
+    // Flush from the invalidate accumulator
+    if (accumulator.InvalidateAll([this](GPUVAddr addr, size_t size) {
         GetSubmappedRangeImpl<false>(addr, size, page_stash2);
-    });
-    rasterizer->InnerInvalidation(VideoCommon::FixSmallVectorADL(page_stash2));
-    page_stash2.clear();
-    accumulator->Clear();
+    })) {
+        rasterizer->InnerInvalidation(VideoCommon::FixSmallVectorADL(page_stash2));
+        page_stash2.clear();
+    }
 }
 
 const u8* MemoryManager::GetSpan(const GPUVAddr src_addr, const std::size_t size) const {
diff --git a/src/video_core/memory_manager.h b/src/video_core/memory_manager.h
index 1be67b2d0c..868198677c 100644
--- a/src/video_core/memory_manager.h
+++ b/src/video_core/memory_manager.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -18,6 +18,7 @@
 #include "common/range_map.h"
 #include "common/scratch_buffer.h"
 #include "common/virtual_buffer.h"
+#include "video_core/invalidation_accumulator.h"
 #include "video_core/cache_types.h"
 #include "video_core/host1x/gpu_device_memory_manager.h"
 #include "video_core/pte_kind.h"
@@ -26,10 +27,6 @@ namespace VideoCore {
 class RasterizerInterface;
 }
 
-namespace VideoCommon {
-class InvalidationAccumulator;
-}
-
 namespace Core {
 class System;
 } // namespace Core
@@ -249,7 +246,7 @@ private:
     static constexpr size_t continuous_bits = 64;
 
     const size_t unique_identifier;
-    std::unique_ptr<VideoCommon::InvalidationAccumulator> accumulator;
+    VideoCommon::InvalidationAccumulator accumulator;
 
     static std::atomic<size_t> unique_identifier_generator;