Merge pull request #530 from mohammadsyuhada/nx/sync-gpu-option

libretro: Options: add Synchronize GPU Thread for dual core

Source/Core/DolphinLibretro/Boot.cpp

@@ -370,6 +370,10 @@ bool retro_load_game(const struct retro_game_info* game)
   Config::SetBase(Config::MAIN_CPU_THREAD,
     Libretro::GetOption<bool>(core::MAIN_CPU_THREAD, /*def=*/true));
 
+  // Dual core's GPU thread kept in step with the CPU thread (Dolphin's "Synchronize GPU Thread").
+  Config::SetBase(Config::MAIN_SYNC_GPU,
+    Libretro::GetOption<bool>(core::MAIN_SYNC_GPU, /*def=*/false));
+
   Config::SetBase(Config::MAIN_LOAD_GAME_INTO_MEMORY,
     Libretro::GetOption<bool>(core::MAIN_LOAD_GAME_INTO_MEMORY, /*def=*/false));
 

Source/Core/DolphinLibretro/Common/Options.cpp

@@ -175,6 +175,20 @@ static struct retro_core_option_v2_definition option_defs[] = {
     },
     "enabled"
   },
+  {
+    Libretro::Options::core::MAIN_SYNC_GPU,
+    "Core > Synchronize GPU Thread",
+    "Synchronize GPU Thread",
+    "Keeps the dual-core GPU thread in step with the CPU thread, which stops FIFO desyncs at some speed cost. Requires core RESTART.",
+    nullptr,
+    CATEGORY_CORE,
+    {
+      { "disabled", "Disabled" },
+      { "enabled",  "Enabled" },
+      { nullptr, nullptr }
+    },
+    "disabled"
+  },
   {
     Libretro::Options::core::MAIN_LOAD_GAME_INTO_MEMORY,
     "Core > Load Whole Game Into Memory",

Source/Core/DolphinLibretro/Common/Options.h

@@ -164,6 +164,7 @@ namespace core {
   constexpr const char CPU_CLOCK_RATE[] = "dolphin_cpu_clock_rate";
   constexpr const char EMULATION_SPEED[] = "dolphin_emulation_speed";
   constexpr const char MAIN_CPU_THREAD[] = "dolphin_main_cpu_thread";
+  constexpr const char MAIN_SYNC_GPU[] = "dolphin_sync_gpu";
   constexpr const char MAIN_LOAD_GAME_INTO_MEMORY[] = "dolphin_main_load_game_into_memory";
   constexpr const char MAIN_PRECISION_FRAME_TIMING[] = "dolphin_precision_frame_timing";
   constexpr const char FASTMEM[] = "dolphin_fastmem";