Increase paint struct limit by using shared pool

src/openrct2/interface/Viewport.cpp

@@ -852,6 +852,7 @@ static void record_session(const paint_session* session, std::vector<paint_sessi
     // This is done to extract the session for benchmark.
     // Place the copied session at provided record_index, so the caller can decide which columns/paint sessions to copy;
     // there is no column information embedded in the session itself.
+    /*
     (*recorded_sessions)[record_index] = (*session);
     paint_session* session_copy = &recorded_sessions->at(record_index);
 
@@ -867,6 +868,7 @@ static void record_session(const paint_session* session, std::vector<paint_sessi
         quad = reinterpret_cast<paint_struct*>(
             quad ? int(quad - &session->PaintStructs[0].basic) : std::size(session->Quadrants));
     }
+    */
 }
 
 static void viewport_fill_column(paint_session* session, std::vector<paint_session>* recorded_sessions, size_t record_index)

src/openrct2/paint/Paint.cpp

@@ -139,9 +139,6 @@ static paint_struct* CreateNormalPaintStruct(
     paint_session* session, const uint32_t image_id, const CoordsXYZ& offset, const CoordsXYZ& boundBoxSize,
     const CoordsXYZ& boundBoxOffset)
 {
-    if (session->NoPaintStructsAvailable())
-        return nullptr;
-
     auto* const g1 = gfx_get_g1_element(image_id & 0x7FFFF);
     if (g1 == nullptr)
     {
@@ -162,7 +159,12 @@ static paint_struct* CreateNormalPaintStruct(
     const auto rotBoundBoxOffset = CoordsXYZ{ boundBoxOffset.Rotate(swappedRotation), boundBoxOffset.z };
     const auto rotBoundBoxSize = RotateBoundBoxSize(boundBoxSize, session->CurrentRotation);
 
-    paint_struct* ps = session->AllocateNormalPaintEntry();
+    auto* ps = session->AllocateNormalPaintEntry();
+    if (ps == nullptr)
+    {
+        return nullptr;
+    }
+
     ps->image_id = image_id;
     ps->x = imagePos.x;
     ps->y = imagePos.y;
@@ -847,18 +849,18 @@ paint_struct* PaintAddImageAsChild(
  */
 bool PaintAttachToPreviousAttach(paint_session* session, uint32_t image_id, int16_t x, int16_t y)
 {
-    if (session->NoPaintStructsAvailable())
-    {
-        return false;
-    }
-
-    attached_paint_struct* previousAttachedPS = session->LastAttachedPS;
+    auto* previousAttachedPS = session->LastAttachedPS;
     if (previousAttachedPS == nullptr)
     {
         return PaintAttachToPreviousPS(session, image_id, x, y);
     }
 
-    attached_paint_struct* ps = session->AllocateAttachedPaintEntry();
+    auto* ps = session->AllocateAttachedPaintEntry();
+    if (ps == nullptr)
+    {
+        return false;
+    }
+
     ps->image_id = image_id;
     ps->x = x;
     ps->y = y;
@@ -880,18 +882,18 @@ bool PaintAttachToPreviousAttach(paint_session* session, uint32_t image_id, int1
  */
 bool PaintAttachToPreviousPS(paint_session* session, uint32_t image_id, int16_t x, int16_t y)
 {
-    if (session->NoPaintStructsAvailable())
-    {
-        return false;
-    }
-
-    paint_struct* masterPs = session->LastPS;
+    auto* masterPs = session->LastPS;
     if (masterPs == nullptr)
     {
         return false;
     }
 
-    attached_paint_struct* ps = session->AllocateAttachedPaintEntry();
+    auto* ps = session->AllocateAttachedPaintEntry();
+    if (ps == nullptr)
+    {
+        return false;
+    }
+
     ps->image_id = image_id;
     ps->x = x;
     ps->y = y;
@@ -918,7 +920,8 @@ void PaintFloatingMoneyEffect(
     paint_session* session, money32 amount, rct_string_id string_id, int16_t y, int16_t z, int8_t y_offsets[], int16_t offset_x,
     uint32_t rotation)
 {
-    if (session->NoPaintStructsAvailable())
+    auto* ps = session->AllocateStringPaintEntry();
+    if (ps == nullptr)
     {
         return;
     }
@@ -930,7 +933,6 @@ void PaintFloatingMoneyEffect(
     };
     const auto coord = translate_3d_to_2d_with_z(rotation, position);
 
-    paint_string_struct* ps = session->AllocateStringPaintEntry();
     ps->string_id = string_id;
     ps->next = nullptr;
     ps->args[0] = amount;

src/openrct2/paint/Paint.h

@@ -15,6 +15,9 @@
 #include "../interface/Colour.h"
 #include "../world/Location.hpp"
 
+#include <mutex>
+#include <thread>
+
 struct TileElement;
 enum class ViewportInteractionItem : uint8_t;
 
@@ -135,10 +138,33 @@ struct tunnel_entry
 #define MAX_PAINT_QUADRANTS 512
 #define TUNNEL_MAX_COUNT 65
 
+struct PaintStructPool
+{
+    FixedVector<paint_entry, 0x80000> PaintStructs;
+    std::mutex _mutex;
+
+    paint_entry* Allocate()
+    {
+        std::lock_guard<std::mutex> guard(_mutex);
+
+        if (PaintStructs.size() < PaintStructs.capacity())
+        {
+            return &PaintStructs.emplace_back();
+        }
+        return nullptr;
+    }
+
+    void Clear()
+    {
+        PaintStructs.clear();
+    }
+};
+
 struct paint_session
 {
     rct_drawpixelinfo DPI;
-    FixedVector<paint_entry, 4000> PaintStructs;
+    // FixedVector<paint_entry, 4000> PaintStructs;
+    PaintStructPool* SharedPaintStructPool;
     paint_struct* Quadrants[MAX_PAINT_QUADRANTS];
     paint_struct* LastPS;
     paint_string_struct* PSStringHead;
@@ -169,36 +195,46 @@ struct paint_session
     uint16_t WaterHeight;
     uint32_t TrackColours[4];
 
-    constexpr bool NoPaintStructsAvailable() noexcept
+    paint_struct* AllocateNormalPaintEntry() noexcept
     {
-        return PaintStructs.size() >= PaintStructs.capacity();
-    }
-
-    constexpr paint_struct* AllocateNormalPaintEntry() noexcept
-    {
-        LastPS = &PaintStructs.emplace_back().basic;
-        return LastPS;
-    }
-
-    constexpr attached_paint_struct* AllocateAttachedPaintEntry() noexcept
-    {
-        LastAttachedPS = &PaintStructs.emplace_back().attached;
-        return LastAttachedPS;
-    }
-
-    constexpr paint_string_struct* AllocateStringPaintEntry() noexcept
-    {
-        auto* string = &PaintStructs.emplace_back().string;
-        if (LastPSString == nullptr)
+        auto* entry = SharedPaintStructPool->Allocate();
+        if (entry != nullptr)
         {
-            PSStringHead = string;
+            LastPS = &entry->basic;
+            return LastPS;
         }
-        else
+        return nullptr;
+    }
+
+    attached_paint_struct* AllocateAttachedPaintEntry() noexcept
+    {
+        auto* entry = SharedPaintStructPool->Allocate();
+        if (entry != nullptr)
         {
-            LastPSString->next = string;
+            LastAttachedPS = &entry->attached;
+            return LastAttachedPS;
         }
-        LastPSString = string;
-        return LastPSString;
+        return nullptr;
+    }
+
+    paint_string_struct* AllocateStringPaintEntry() noexcept
+    {
+        auto* entry = SharedPaintStructPool->Allocate();
+        if (entry != nullptr)
+        {
+            auto* string = &entry->string;
+            if (LastPSString == nullptr)
+            {
+                PSStringHead = string;
+            }
+            else
+            {
+                LastPSString->next = string;
+            }
+            LastPSString = string;
+            return LastPSString;
+        }
+        return nullptr;
     }
 };
 

src/openrct2/paint/Painter.cpp

@@ -37,6 +37,8 @@ Painter::Painter(const std::shared_ptr<IUiContext>& uiContext)
 
 void Painter::Paint(IDrawingEngine& de)
 {
+    _paintStructPool.Clear();
+
     auto dpi = de.GetDrawingPixelInfo();
     if (gIntroState != IntroState::None)
     {
@@ -151,7 +153,7 @@ paint_session* Painter::CreateSession(rct_drawpixelinfo* dpi, uint32_t viewFlags
     session->ViewFlags = viewFlags;
     session->QuadrantBackIndex = std::numeric_limits<uint32_t>::max();
     session->QuadrantFrontIndex = 0;
-    session->PaintStructs.clear();
+    session->SharedPaintStructPool = &_paintStructPool;
 
     std::fill(std::begin(session->Quadrants), std::end(session->Quadrants), nullptr);
     session->LastPS = nullptr;

src/openrct2/paint/Painter.h

@@ -38,6 +38,7 @@ namespace OpenRCT2
             std::shared_ptr<Ui::IUiContext> const _uiContext;
             std::vector<std::unique_ptr<paint_session>> _paintSessionPool;
             std::vector<paint_session*> _freePaintSessions;
+            PaintStructPool _paintStructPool;
             time_t _lastSecond = 0;
             int32_t _currentFPS = 0;
             int32_t _frames = 0;