Make "Skip GPU readbacks" a multi-choice option, for easier experimentation by users

Core/Config.cpp

@@ -658,7 +658,7 @@ static const ConfigSetting graphicsSettings[] = {
 	ConfigSetting("TextureShader", &g_Config.sTextureShaderName, "Off", CfgFlag::PER_GAME),
 	ConfigSetting("ShaderChainRequires60FPS", &g_Config.bShaderChainRequires60FPS, false, CfgFlag::PER_GAME),
 
-	ConfigSetting("SkipGPUReadbacks", &g_Config.bSkipGPUReadbacks, false, CfgFlag::PER_GAME | CfgFlag::REPORT),
+	ConfigSetting("SkipGPUReadbackMode", &g_Config.iSkipGPUReadbackMode, false, CfgFlag::PER_GAME | CfgFlag::REPORT),
 
 	ConfigSetting("GfxDebugOutput", &g_Config.bGfxDebugOutput, false, CfgFlag::DONT_SAVE),
 	ConfigSetting("LogFrameDrops", &g_Config.bLogFrameDrops, false, CfgFlag::DEFAULT),

Core/Config.h

@@ -235,7 +235,7 @@ public:
 	float fCwCheatScrollPosition;
 	float fGameListScrollPosition;
 	int iBloomHack; //0 = off, 1 = safe, 2 = balanced, 3 = aggressive
-	bool bSkipGPUReadbacks;
+	int iSkipGPUReadbackMode;  // 0 = off, 1 = skip, 2 = to texture
 	int iSplineBezierQuality; // 0 = low , 1 = Intermediate , 2 = High
 	bool bHardwareTessellation;
 	bool bShaderCache;  // Hidden ini-only setting, useful for debugging shader compile times.

Core/ConfigValues.h

@@ -176,3 +176,9 @@ enum class DisplayFramerateMode : int {
 	FORCE_60HZ_METHOD1,
 	FORCE_60HZ_METHOD2,
 };
+
+enum class SkipGPUReadbackMode : int {
+	NO,
+	SKIP,
+	COPY_TO_TEXTURE,
+};