System: Add taints to save states

This informs the user they are loading a save state that at some point
had potentially-game-breaking options enabled, and a reset is necessary
to clear them.

src/core/cheats.cpp

@@ -237,6 +237,8 @@ static EnableCodeList s_enabled_patches;
 
 static ActiveCodeList s_frame_end_codes;
 
+static u32 s_active_patch_count = 0;
+static u32 s_active_cheat_count = 0;
 static bool s_patches_enabled = false;
 static bool s_cheats_enabled = false;
 static bool s_database_cheat_codes_enabled = false;
@@ -828,6 +830,8 @@ void Cheats::ReloadCheats(bool reload_files, bool reload_enabled_list, bool verb
 
 void Cheats::UnloadAll()
 {
+  s_active_cheat_count = 0;
+  s_active_patch_count = 0;
   s_frame_end_codes = ActiveCodeList();
   s_enabled_patches = EnableCodeList();
   s_enabled_cheats = EnableCodeList();
@@ -862,35 +866,39 @@ void Cheats::UpdateActiveCodes(bool reload_enabled_list, bool verbose, bool verb
   const size_t prev_count = s_frame_end_codes.size();
   s_frame_end_codes.clear();
 
-  u32 patch_count = 0;
-  u32 cheat_count = 0;
+  s_active_patch_count = 0;
+  s_active_cheat_count = 0;
 
   if (!g_settings.disable_all_enhancements)
   {
     const bool hc_mode_active = Achievements::IsHardcoreModeActive();
-    patch_count = EnableCheats(s_patch_codes, s_enabled_patches, "Patches", hc_mode_active);
-    cheat_count = AreCheatsEnabled() ? EnableCheats(s_cheat_codes, s_enabled_cheats, "Cheats", hc_mode_active) : 0;
+    s_active_patch_count = EnableCheats(s_patch_codes, s_enabled_patches, "Patches", hc_mode_active);
+    s_active_cheat_count =
+      AreCheatsEnabled() ? EnableCheats(s_cheat_codes, s_enabled_cheats, "Cheats", hc_mode_active) : 0;
   }
 
   // Display message on first boot when we load patches.
   // Except when it's just GameDB.
   const size_t new_count = s_frame_end_codes.size();
   if (verbose || (verbose_if_changed && prev_count != new_count))
   {
-    if (patch_count > 0)
+    if (s_active_patch_count > 0)
     {
-      Host::AddIconOSDMessage("LoadPatches", ICON_FA_BAND_AID,
-                              TRANSLATE_PLURAL_STR("Cheats", "%n game patches are active.", "OSD Message", patch_count),
-                              Host::OSD_INFO_DURATION);
+      System::SetTaint(System::Taint::Patches);
+      Host::AddIconOSDMessage(
+        "LoadPatches", ICON_FA_BAND_AID,
+        TRANSLATE_PLURAL_STR("Cheats", "%n game patches are active.", "OSD Message", s_active_patch_count),
+        Host::OSD_INFO_DURATION);
     }
-    if (cheat_count > 0)
+    if (s_active_cheat_count > 0)
     {
-      Host::AddIconOSDMessage(
-        "LoadCheats", ICON_EMOJI_WARNING,
-        TRANSLATE_PLURAL_STR("Cheats", "%n cheats are enabled. This may crash games.", "OSD Message", cheat_count),
-        Host::OSD_WARNING_DURATION);
+      System::SetTaint(System::Taint::Cheats);
+      Host::AddIconOSDMessage("LoadCheats", ICON_EMOJI_WARNING,
+                              TRANSLATE_PLURAL_STR("Cheats", "%n cheats are enabled. This may crash games.",
+                                                   "OSD Message", s_active_cheat_count),
+                              Host::OSD_WARNING_DURATION);
     }
-    else if (patch_count == 0)
+    else if (s_active_patch_count == 0)
     {
       Host::RemoveKeyedOSDMessage("LoadPatches");
       Host::AddIconOSDMessage("LoadCheats", ICON_FA_BAND_AID,
@@ -936,6 +944,16 @@ bool Cheats::ApplyManualCode(const std::string_view name)
   return false;
 }
 
+u32 Cheats::GetActivePatchCount()
+{
+  return s_active_patch_count;
+}
+
+u32 Cheats::GetActiveCheatCount()
+{
+  return s_active_cheat_count;
+}
+
 //////////////////////////////////////////////////////////////////////////
 // File Parsing
 //////////////////////////////////////////////////////////////////////////

src/core/cheats.h

@@ -143,6 +143,12 @@ extern bool EnumerateManualCodes(std::function<bool(const std::string& name)> ca
 /// Invokes/applies the specified manually-activated code.
 extern bool ApplyManualCode(const std::string_view name);
 
+/// Returns the number of active patches.
+extern u32 GetActivePatchCount();
+
+/// Returns the number of active cheats.
+extern u32 GetActiveCheatCount();
+
 // Config sections/keys to use to enable patches.
 extern const char* PATCHES_CONFIG_SECTION;
 extern const char* CHEATS_CONFIG_SECTION;

src/core/save_state_version.h

@@ -6,7 +6,7 @@
 #include "common/types.h"
 
 static constexpr u32 SAVE_STATE_MAGIC = 0x43435544;
-static constexpr u32 SAVE_STATE_VERSION = 74;
+static constexpr u32 SAVE_STATE_VERSION = 75;
 static constexpr u32 SAVE_STATE_MINIMUM_VERSION = 42;
 
 static_assert(SAVE_STATE_VERSION >= SAVE_STATE_MINIMUM_VERSION);

src/core/system.cpp

@@ -151,6 +151,8 @@ static bool ShouldStartPaused();
 
 /// Checks for settings changes, std::move() the old settings away for comparing beforehand.
 static void CheckForSettingsChanges(const Settings& old_settings);
+static void SetTaintsFromSettings();
+static void WarnAboutStateTaints(u32 state_taints);
 static void WarnAboutUnsafeSettings();
 static void LogUnsafeSettingsToConsole(const SmallStringBase& messages);
 
@@ -251,6 +253,7 @@ static u32 s_frame_number = 1;
 static u32 s_internal_frame_number = 1;
 static const BIOS::ImageInfo* s_bios_image_info = nullptr;
 static BIOS::ImageInfo::Hash s_bios_hash = {};
+static u32 s_taints = 0;
 
 static std::string s_running_game_path;
 static std::string s_running_game_serial;
@@ -660,6 +663,49 @@ bool System::IsPALRegion()
   return s_region == ConsoleRegion::PAL;
 }
 
+const char* System::GetTaintDisplayName(Taint taint)
+{
+  static constexpr const std::array<const char*, static_cast<size_t>(Taint::MaxCount)> names = {{
+    TRANSLATE_DISAMBIG_NOOP("System", "CPU Overclock", "Taint"),
+    TRANSLATE_DISAMBIG_NOOP("System", "CD-ROM Read Speedup", "Taint"),
+    TRANSLATE_DISAMBIG_NOOP("System", "CD-ROM Seek Speedup", "Taint"),
+    TRANSLATE_DISAMBIG_NOOP("System", "Force Frame Timings", "Taint"),
+    TRANSLATE_DISAMBIG_NOOP("System", "8MB RAM", "Taint"),
+    TRANSLATE_DISAMBIG_NOOP("System", "Cheats", "Taint"),
+    TRANSLATE_DISAMBIG_NOOP("System", "Game Patches", "Taint"),
+  }};
+
+  return names[static_cast<size_t>(taint)];
+}
+
+const char* System::GetTaintName(Taint taint)
+{
+  static constexpr const std::array<const char*, static_cast<size_t>(Taint::MaxCount)> names = {{
+    "CPUOverclock",
+    "CDROMReadSpeedup",
+    "CDROMSeekSpeedup",
+    "ForceFrameTimings",
+    "RAM8MB",
+    "Cheats",
+    "Patches",
+  }};
+
+  return names[static_cast<size_t>(taint)];
+}
+
+bool System::HasTaint(Taint taint)
+{
+  return (s_taints & (1u << static_cast<u8>(taint))) != 0u;
+}
+
+void System::SetTaint(Taint taint)
+{
+  if (!HasTaint(taint))
+    WARNING_LOG("Setting system taint: {}", GetTaintName(taint));
+
+  s_taints |= (1u << static_cast<u8>(taint));
+}
+
 TickCount System::GetMaxSliceTicks()
 {
   return s_max_slice_ticks;
@@ -2039,6 +2085,7 @@ void System::DestroySystem()
     Host::ReleaseGPUDevice();
   }
 
+  s_taints = 0;
   s_bios_hash = {};
   s_bios_image_info = nullptr;
   s_exe_override = {};
@@ -2464,6 +2511,11 @@ bool System::DoState(StateWrapper& sw, GPUTexture** host_texture, bool update_di
     sw.Do(&s_region);
   }
 
+  u32 state_taints = s_taints;
+  sw.DoEx(&state_taints, 75, static_cast<u32>(0));
+  if (state_taints != s_taints) [[unlikely]]
+    WarnAboutStateTaints(state_taints);
+
   sw.Do(&s_frame_number);
   sw.Do(&s_internal_frame_number);
 
@@ -2600,6 +2652,9 @@ void System::InternalReset()
   if (IsShutdown())
     return;
 
+  // reset and clear taints
+  SetTaintsFromSettings();
+
   TimingEvents::Reset();
   CPU::Reset();
   CPU::CodeCache::Reset();
@@ -4580,6 +4635,54 @@ void System::CheckForSettingsChanges(const Settings& old_settings)
   }
 }
 
+void System::SetTaintsFromSettings()
+{
+  s_taints = 0;
+
+  if (g_settings.cdrom_read_speedup > 1)
+    SetTaint(Taint::CDROMReadSpeedup);
+  if (g_settings.cdrom_seek_speedup > 1)
+    SetTaint(Taint::CDROMSeekSpeedup);
+  if (g_settings.cpu_overclock_active)
+    SetTaint(Taint::CPUOverclock);
+  if (g_settings.gpu_force_video_timing != ForceVideoTimingMode::Disabled)
+    SetTaint(Taint::ForceFrameTimings);
+  if (g_settings.enable_8mb_ram)
+    SetTaint(Taint::RAM8MB);
+  if (Cheats::GetActivePatchCount() > 0)
+    SetTaint(Taint::Patches);
+  if (Cheats::GetActiveCheatCount() > 0)
+    SetTaint(Taint::Cheats);
+}
+
+void System::WarnAboutStateTaints(u32 state_taints)
+{
+  const u32 taints_active_in_file = state_taints & ~s_taints;
+  if (taints_active_in_file == 0)
+    return;
+
+  LargeString messages;
+  for (u32 i = 0; i < static_cast<u32>(Taint::MaxCount); i++)
+  {
+    if (!(taints_active_in_file & (1u << i)))
+      continue;
+
+    if (messages.empty())
+    {
+      messages.append_format(
+        "{} {}\n", ICON_EMOJI_WARNING,
+        TRANSLATE_SV("System", "This save state was created with the following tainted options, and may\n"
+                               "       be unstable. You will need to reset the system to clear any effects."));
+    }
+
+    messages.append("        \u2022 ");
+    messages.append(GetTaintDisplayName(static_cast<Taint>(i)));
+    messages.append('\n');
+  }
+
+  Host::AddKeyedOSDWarning("SystemTaintsFromState", std::string(messages.view()), Host::OSD_WARNING_DURATION);
+}
+
 void System::WarnAboutUnsafeSettings()
 {
   LargeString messages;

src/core/system.h

@@ -104,6 +104,18 @@ enum class BootMode
   BootPSF,
 };
 
+enum class Taint : u8
+{
+  CPUOverclock,
+  CDROMReadSpeedup,
+  CDROMSeekSpeedup,
+  ForceFrameTimings,
+  RAM8MB,
+  Cheats,
+  Patches,
+  MaxCount,
+};
+
 extern TickCount g_ticks_per_second;
 
 /// Returns true if the filename is a PlayStation executable we can inject.
@@ -156,6 +168,12 @@ ConsoleRegion GetRegion();
 DiscRegion GetDiscRegion();
 bool IsPALRegion();
 
+/// Taints - flags that are set on the system and only cleared on reset.
+const char* GetTaintDisplayName(Taint taint);
+const char* GetTaintName(Taint taint);
+bool HasTaint(Taint taint);
+void SetTaint(Taint taint);
+
 ALWAYS_INLINE TickCount GetTicksPerSecond()
 {
   return g_ticks_per_second;