From 1b7010203b385c9fbad60b41eefa76e9158aaa9e Mon Sep 17 00:00:00 2001
From: Swung0x48 <swung0x48@outlook.com>
Date: Sun, 20 Sep 2026 00:03:10 -0400
Subject: [PATCH] [MG_Test] (Disaggregated): P5f fs - prove virtual default XFB
 objects get distinct native twins

---
 .../Backend/DirectGLES/ContextEpochTest.cpp   | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/MobileGL/MG_Test/Backend/DirectGLES/ContextEpochTest.cpp b/MobileGL/MG_Test/Backend/DirectGLES/ContextEpochTest.cpp
index 7419f0fe..2bca9fdd 100644
--- a/MobileGL/MG_Test/Backend/DirectGLES/ContextEpochTest.cpp
+++ b/MobileGL/MG_Test/Backend/DirectGLES/ContextEpochTest.cpp
@@ -104,20 +104,29 @@ TEST(ContextEpochTest, SameXfbNameInTwoServedContextsDoesNotAliasThePausedSpan)
     DriverScope scope;
     auto& state = MG_Pipe::MGPipeApplier();
     const auto saved = state.BoundStreamOutputLifetimeId;
-    state.BoundStreamOutputLifetimeId = 101;
-    XfbImpl::BindTransformFeedback(1);
+    auto firstContext = MakeUnique<MG_State::GLState::GLContext>();
+    auto secondContext = MakeUnique<MG_State::GLState::GLContext>();
+    const Uint64 firstLifetime = firstContext->GetBoundTransformFeedbackLifetimeId();
+    const Uint64 secondLifetime = secondContext->GetBoundTransformFeedbackLifetimeId();
+    ASSERT_NE(firstLifetime, 0u);
+    ASSERT_NE(secondLifetime, 0u);
+    ASSERT_NE(firstLifetime, secondLifetime);
+    state.BoundStreamOutputLifetimeId = firstLifetime;
+    XfbImpl::BindTransformFeedback(0);
     const Uint first = boundXfb;
+    EXPECT_NE(first, 0u) << "virtual name 0 needs its own native object";
     XfbImpl::BeginTransformFeedback(GL_POINTS);
     EXPECT_TRUE(XfbImpl::IsCaptureSpanOpen());
     XfbImpl::PauseTransformFeedback();
     EXPECT_FALSE(XfbImpl::IsCaptureSpanOpen());
-    state.BoundStreamOutputLifetimeId = 202;
-    XfbImpl::BindTransformFeedback(1);
+    state.BoundStreamOutputLifetimeId = secondLifetime;
+    XfbImpl::BindTransformFeedback(0);
+    EXPECT_NE(boundXfb, 0u);
     EXPECT_NE(first, boundXfb) << "the GL name was mistaken for cross-context identity";
     EXPECT_FALSE(XfbImpl::IsCaptureSpanOpen());
     XfbImpl::BeginTransformFeedback(GL_POINTS);
     EXPECT_TRUE(XfbImpl::IsCaptureSpanOpen());
-    state.BoundStreamOutputLifetimeId = 101;
+    state.BoundStreamOutputLifetimeId = firstLifetime;
     EXPECT_FALSE(XfbImpl::IsCaptureSpanOpen()) << "returning to the paused object inherited another context's span";
     EXPECT_EQ(boundXfb, first);
     XfbImpl::ResumeTransformFeedback();