OpenXR - View matrix identity check breaking several games fixed

Common/VR/PPSSPPVR.cpp

@@ -655,7 +655,8 @@ bool Is2DVRObject(float* projMatrix, bool ortho) {
 void UpdateVRParams(float* projMatrix, float* viewMatrix) {
 
 	// Set mirroring of axes
-	if (!vrMirroring[VR_MIRRORING_UPDATED] && !IsMatrixIdentity(projMatrix) && !IsMatrixIdentity(viewMatrix)) {
+	bool identityView = PSP_CoreParameter().compat.vrCompat().IdentityViewHack && IsMatrixIdentity(viewMatrix);
+	if (!vrMirroring[VR_MIRRORING_UPDATED] && !IsMatrixIdentity(projMatrix) && !identityView) {
 		vrMirroring[VR_MIRRORING_UPDATED] = true;
 		vrMirroring[VR_MIRRORING_AXIS_X] = projMatrix[0] < 0;
 		vrMirroring[VR_MIRRORING_AXIS_Y] = projMatrix[5] < 0;
@@ -697,7 +698,7 @@ void UpdateVRView(float* leftEye, float* rightEye) {
 	for (int index = 0; index < 2; index++) {
 
 		// Validate the view matrix
-		if (IsMatrixIdentity(dst[index])) {
+		if (PSP_CoreParameter().compat.vrCompat().IdentityViewHack && IsMatrixIdentity(dst[index])) {
 			return;
 		}
 

Core/Compatibility.cpp

@@ -122,6 +122,7 @@ void Compatibility::CheckSettings(IniFile &iniFile, const std::string &gameID) {
 }
 
 void Compatibility::CheckVRSettings(IniFile &iniFile, const std::string &gameID) {
+	CheckSetting(iniFile, gameID, "IdentityViewHack", &vrCompat_.IdentityViewHack);
 	CheckSetting(iniFile, gameID, "Skyplane", &vrCompat_.Skyplane);
 	CheckSetting(iniFile, gameID, "UnitsPerMeter", &vrCompat_.UnitsPerMeter);
 

Core/Compatibility.h

@@ -93,6 +93,7 @@ struct CompatFlags {
 };
 
 struct VRCompat {
+	bool IdentityViewHack;
 	bool Skyplane;
 	float UnitsPerMeter;
 };

assets/compatvr.ini

@@ -30,6 +30,18 @@
 # ========================================================================================
 
 
+[IdentityViewHack]
+# Disables head tracking for render passes where view matrix is Identity
+
+# Sonic Rivals 1
+ULES00622 = true
+ULUS10195 = true
+
+# Sonic Rivals 2
+ULES00940 = true
+ULUS10323 = true
+
+
 [Skyplane]
 # Workaround to remove the background skyplane and add clearing framebuffer with a fog color.
 
@@ -53,6 +65,7 @@ ULJM05395 = true
 ULJM05884 = true
 ULUS10160 = true
 
+
 [UnitsPerMeter]
 # Scale of game world to convert the world units into meters. This enables following VR features:
 # + 3D stereoscopy  (that can work only with accurate values)