Temporary workaround for Wipeout Pure lens flare flicker.

See #13344.

Will try to figure out something better after the next release...

Core/Compatibility.cpp

@@ -77,6 +77,7 @@ void Compatibility::CheckSettings(IniFile &iniFile, const std::string &gameID) {
 	CheckSetting(iniFile, gameID, "ReinterpretFramebuffers", &flags_.ReinterpretFramebuffers);
 	CheckSetting(iniFile, gameID, "DoublePrecisionSinCos", &flags_.DoublePrecisionSinCos);
 	CheckSetting(iniFile, gameID, "ShaderColorBitmask", &flags_.ShaderColorBitmask);
+	CheckSetting(iniFile, gameID, "DisableFirstFrameReadback", &flags_.DisableFirstFrameReadback);
 }
 
 void Compatibility::CheckSetting(IniFile &iniFile, const std::string &gameID, const char *option, bool *flag) {

Core/Compatibility.h

@@ -75,6 +75,7 @@ struct CompatFlags {
 	bool ReinterpretFramebuffers;
 	bool DoublePrecisionSinCos;
 	bool ShaderColorBitmask;
+	bool DisableFirstFrameReadback;
 };
 
 class IniFile;

GPU/Common/FramebufferManagerCommon.cpp

@@ -1003,7 +1003,7 @@ void FramebufferManagerCommon::DownloadFramebufferOnSwitch(VirtualFramebuffer *v
 		// Some games will draw to some memory once, and use it as a render-to-texture later.
 		// To support this, we save the first frame to memory when we have a safe w/h.
 		// Saving each frame would be slow.
-		if (!g_Config.bDisableSlowFramebufEffects) {
+		if (!g_Config.bDisableSlowFramebufEffects && !PSP_CoreParameter().compat.flags().DisableFirstFrameReadback) {
 			ReadFramebufferToMemory(vfb, 0, 0, vfb->safeWidth, vfb->safeHeight);
 			vfb->usageFlags = (vfb->usageFlags | FB_USAGE_DOWNLOAD) & ~FB_USAGE_DOWNLOAD_CLEAR;
 			vfb->firstFrameSaved = true;

assets/compat.ini

@@ -857,3 +857,11 @@ ULES01301 = true
 ULJS00218 = true
 # Hitman Reborn Battle Arena
 ULJS00157 = true
+
+[DisableFirstFrameReadback]
+# Wipeout Pure: Temporary workaround for lens flare flicker. See #13344
+UCUS98612 = true
+UCJS10007 = true
+UCES00001 = true
+UCKS45008 = true
+NPJG00059 = true