From fe6aba89a827d1829384c9cd2fbcd57826e34f2d Mon Sep 17 00:00:00 2001
From: Yossi Yadgar <yadgar360@gmail.com>
Date: Tue, 20 Oct 2026 10:12:03 +0300
Subject: [PATCH] feat(libSceHmd): refuse the field of view, eye offset and
 sensor queries without a headset

No handle is ever open, as sceHmdOpen reports the headset disconnected, so they return HANDLE_INVALID after initialization and NOT_INITIALIZED before it, without writing their outputs.
---
 core/libs/prx/libSceHmd/Export.cpp | 23 ++++++++++++++---------
 core/libs/prx/libSceHmd/Hmd.hpp    |  3 +++
 core/libs/tests/GuestHmd.cpp       | 24 ++++++++++++++++++++++++
 3 files changed, 41 insertions(+), 9 deletions(-)

diff --git a/core/libs/prx/libSceHmd/Export.cpp b/core/libs/prx/libSceHmd/Export.cpp
index e90bf60b5b..6b533528b0 100644
--- a/core/libs/prx/libSceHmd/Export.cpp
+++ b/core/libs/prx/libSceHmd/Export.cpp
@@ -262,9 +262,11 @@ int APS5_VABI sceHmdReprojectionInitializeCapture(void) {
     return 0;
 }
 
-int APS5_VABI sceHmdGet2DEyeOffset(void) {
-    NotImplemented_nid_no_patch(__func__);
-    return 0;
+int APS5_VABI sceHmdGet2DEyeOffset(std::int32_t handle, void* leftOffset, void* rightOffset) {
+    (void)handle;
+    (void)leftOffset;
+    (void)rightOffset;
+    return initialized.load() ? Hmd::InvalidHandle : Hmd::NotInitialized;
 }
 
 int APS5_VABI sceHmdInternalSetDebugSocialScreenMode(void) {
@@ -376,9 +378,10 @@ int APS5_VABI sceHmdInternalSetM2LedOn(void) {
     return 0;
 }
 
-int APS5_VABI sceHmdGetFieldOfView(void) {
-    NotImplemented_nid_no_patch(__func__);
-    return 0;
+int APS5_VABI sceHmdGetFieldOfView(std::int32_t handle, void* fieldOfView) {
+    (void)handle;
+    if (!fieldOfView) return Hmd::ParameterNull;
+    return initialized.load() ? Hmd::InvalidHandle : Hmd::NotInitialized;
 }
 
 int APS5_VABI sceHmdReprojectionAddDisplayBuffer(void) {
@@ -764,9 +767,11 @@ int APS5_VABI sceHmdInternalSetDefaultLedData(void) {
     return 0;
 }
 
-int APS5_VABI sceHmdGetInertialSensorData(void) {
-    NotImplemented_nid_no_patch(__func__);
-    return 0;
+int APS5_VABI sceHmdGetInertialSensorData(std::int32_t handle, void* data, std::int32_t count) {
+    (void)handle;
+    (void)data;
+    (void)count;
+    return initialized.load() ? Hmd::InvalidHandle : Hmd::NotInitialized;
 }
 
 int APS5_VABI sceHmdInternal3dAudioClose(void) {
diff --git a/core/libs/prx/libSceHmd/Hmd.hpp b/core/libs/prx/libSceHmd/Hmd.hpp
index 2daaf92e9b..ee11c14431 100644
--- a/core/libs/prx/libSceHmd/Hmd.hpp
+++ b/core/libs/prx/libSceHmd/Hmd.hpp
@@ -69,6 +69,9 @@ int APS5_VABI sceHmdReprojectionQueryGarlicBuffAlign(void);
 int APS5_VABI sceHmdReprojectionQueryGarlicBuffSize(void);
 int APS5_VABI sceHmdReprojectionQueryOnionBuffAlign(void);
 int APS5_VABI sceHmdReprojectionQueryOnionBuffSize(void);
+int APS5_VABI sceHmdGetFieldOfView(std::int32_t handle, void* fieldOfView);
+int APS5_VABI sceHmdGet2DEyeOffset(std::int32_t handle, void* leftOffset, void* rightOffset);
+int APS5_VABI sceHmdGetInertialSensorData(std::int32_t handle, void* data, std::int32_t count);
 }
 
 #endif
diff --git a/core/libs/tests/GuestHmd.cpp b/core/libs/tests/GuestHmd.cpp
index 6cdaa32c4e..a7bbe47dcd 100644
--- a/core/libs/tests/GuestHmd.cpp
+++ b/core/libs/tests/GuestHmd.cpp
@@ -31,6 +31,28 @@ void CheckBufferQueries() {
     Require(sceHmdReprojectionQueryOnionBuffSize() == 0x810, "reprojection onion buffer size");
 }
 
+void CheckHandleQueries(std::int32_t expected) {
+    unsigned char left[16];
+    unsigned char right[16];
+    unsigned char fieldOfView[16];
+    unsigned char sensor[64];
+    std::memset(left, 0x5a, sizeof(left));
+    std::memset(right, 0x5a, sizeof(right));
+    std::memset(fieldOfView, 0x5a, sizeof(fieldOfView));
+    std::memset(sensor, 0x5a, sizeof(sensor));
+    for (const auto handle : {0, -1, 1, 0x0f000000}) {
+        Require(sceHmdGetFieldOfView(handle, nullptr) == Hmd::ParameterNull, "null field of view accepted");
+        Require(sceHmdGetFieldOfView(handle, fieldOfView) == expected, "field of view without a headset");
+        Require(sceHmdGet2DEyeOffset(handle, left, right) == expected, "eye offset without a headset");
+        Require(sceHmdGet2DEyeOffset(handle, nullptr, nullptr) == expected, "eye offset with null outputs");
+        Require(sceHmdGetInertialSensorData(handle, sensor, 1) == expected, "sensor data without a headset");
+    }
+    for (const auto* bytes : {left, right, fieldOfView}) {
+        for (std::size_t index = 0; index < 16; ++index) Require(bytes[index] == 0x5a, "a refused query wrote its output");
+    }
+    for (const auto byte : sensor) Require(byte == 0x5a, "a refused sensor query wrote its output");
+}
+
 }
 
 int main() {
@@ -47,6 +69,7 @@ int main() {
     Require(sceHmdGetDeviceInformation(nullptr) == Hmd::ParameterNull, "null information");
     Require(sceHmdGetDeviceInformation(&info) == Hmd::NotInitialized, "query before initialize");
     Require(std::memcmp(&info, &untouched, sizeof(info)) == 0, "failed query modified output");
+    CheckHandleQueries(Hmd::NotInitialized);
     Require(sceHmdGetDeviceInformationByHandle(0, &info) == Hmd::NotInitialized,
             "handle query before initialize");
     Require(sceHmdInitialize(nullptr) == Hmd::ParameterNull, "null initialize");
@@ -83,6 +106,7 @@ int main() {
                     "query accepted invalid handle");
             Require(std::memcmp(&info, &expected, sizeof(info)) == 0, "invalid handle modified output");
         }
+        CheckHandleQueries(Hmd::InvalidHandle);
         Require(sceHmdGetDeviceInformationByHandle(0, nullptr) == Hmd::InvalidHandle,
                 "null query accepted invalid handle");
         Require(sceHmdTerminate() == 0, "terminate failed");