Reduce lag in MK8 and Need for Speed Most Wanted U

src/main.cpp

@@ -41,6 +41,9 @@ ON_APPLICATION_START() {
 
     gShortNameEn = GetSanitizedNameOfCurrentApplication();
     startFSIOThreads();
+
+    ApplyGameSpecificPatches();
+
     VPADSetTVMenuInvalid(VPAD_CHAN_0, true);
 }
 

src/retain_vars.cpp

@@ -20,3 +20,5 @@ bool gInProgressNotificationDisplayedTV  = false;
 bool gNotAvailableNotificationDisplayed  = false;
 
 NMColor COLOR_RED = {237, 28, 36, 255};
+
+int32_t gThreadPriorityIncrease = 1;

src/retain_vars.hpp

@@ -23,3 +23,5 @@ extern bool gInProgressNotificationDisplayedTV;
 extern bool gNotAvailableNotificationDisplayed;
 
 extern NMColor COLOR_RED;
+
+extern int32_t gThreadPriorityIncrease;

src/screenshot_utils.cpp

@@ -217,7 +217,7 @@ bool takeScreenshot(GX2ColorBuffer *srcBuffer, GX2ScanTarget scanTarget, GX2Surf
 
     bool res;
 
-    auto threadPriority = OSGetThreadPriority(OSGetCurrentThread()) + 1;
+    auto threadPriority = OSGetThreadPriority(OSGetCurrentThread()) + gThreadPriorityIncrease;
     if (threadPriority != OSGetThreadPriority(gThreadData.thread)) {
         DEBUG_FUNCTION_LINE_ERR("INFO! Set thread priority to %d", threadPriority);
         if (!OSSetThreadPriority(gThreadData.thread, threadPriority)) {

src/utils/utils.cpp

@@ -1,5 +1,6 @@
 #include "StringTools.h"
 #include "logger.h"
+#include "retain_vars.hpp"
 #include <coreinit/title.h>
 #include <malloc.h>
 #include <nn/acp/client.h>
@@ -76,3 +77,24 @@ std::string GetSanitizedNameOfCurrentApplication() {
     }
     return result;
 }
+
+void ApplyGameSpecificPatches() {
+    uint64_t titleID = OSGetTitleID();
+    // Mario Kart 8 has noticeable slowdown when taking screenshots in multiplayer
+    // Decrease the IO thread priority to fix this
+    if (titleID == 0x000500001010ED00L || // Mario Kart 8 EUR
+        titleID == 0x000500001010EB00L || // Mario Kart 8 JPN
+        titleID == 0x000500001010EC00L) { // Mario Kart 8 USA
+        gThreadPriorityIncrease = 2;
+    } else if (titleID == 0x0005000010128400L || // Need for Speed™ Most Wanted U EUR
+               titleID == 0x0005000010128800L || // Need for Speed™ Most Wanted U USA
+               titleID == 0x000500001012B700L) { // Need for Speed™ Most Wanted U JPN
+        gThreadPriorityIncrease = 14;
+    } else if (titleID == 0x0005000010101E00L || // New SUPER MARIO BROS. U EUR
+               titleID == 0x0005000010101D00L || // New SUPER MARIO BROS. U USA
+               titleID == 0x0005000010101C00L) { // NNew SUPER MARIO BROS. U JPN
+        gThreadPriorityIncrease = 2;
+    } else {
+        gThreadPriorityIncrease = 1;
+    }
+}

src/utils/utils.h

@@ -15,3 +15,5 @@ inline uint8_t RGBComponentToSRGB(uint8_t ci) {
 }
 
 std::string GetSanitizedNameOfCurrentApplication();
+
+void ApplyGameSpecificPatches();