fix(runtime): stop forcing single-sample MSAA (#185)

* fix(runtime): stop forcing single-sample MSAA

* test removed

* Fix race in webview helper launcher test

src/runtime/performance_policy.cc

@@ -250,7 +250,9 @@ bool MergePerformanceClientSettingsOverrides(const PerformancePolicy& policy,
 
     // ForceCacheSize settings are byte counts. Let Roblox size its mesh and
     // SLIM content caches; values like 256/128 would cap them to a few bytes.
-    const std::array<ClientSetting, 62> rendering_settings = {{
+    // Leave MSAA selection to Roblox or explicit client-settings overrides.
+    // Forcing one sample disables anti-aliasing even at maximum quality.
+    const std::array<ClientSetting, 61> rendering_settings = {{
         {"FIntSmoothClusterTaskQueueMaxParallelTasks", workers},
         {"FIntOcclusionWorkerThreadCount", occlusion_workers},
         {"FFlagMovePrerenderV2", "True"},
@@ -301,7 +303,6 @@ bool MergePerformanceClientSettingsOverrides(const PerformancePolicy& policy,
         {"FFlagEnableSLIMAvatars", "True"},
         {"FFlagEnableSlimAvatarsDefaultEnabled", "True"},
         {"FFlagLayeredClothingCacheOptimizations", "True"},
-        {"FIntDebugForceMSAASamples", "1"},
         {"FFlagLuauStartupGcSuppression", "False"},
         {"FIntLuauGcStepMul", "300"},
         {"FIntLuauGcGoalCore", "120"},

tests/performance_policy_test.cc

@@ -153,6 +153,34 @@ TEST(PerformancePolicyTest, WorkerModesRetainRobloxManagedAssetCacheSizes) {
   }
 }
 
+TEST(PerformancePolicyTest, WorkerModesPreserveRobloxAndExplicitMsaaSelection) {
+  for (const bool throughput : {false, true}) {
+    PerformancePolicy policy;
+    policy.multithreaded_rendering = !throughput;
+    policy.physical_core_count = 14;
+    policy.physics_worker_mode = throughput ? PhysicsWorkerMode::kThroughput
+                                            : PhysicsWorkerMode::kAuto;
+    for (const std::string samples : {"", "1", "4", "8"}) {
+      nlohmann::json requested = nlohmann::json::object();
+      if (!samples.empty()) {
+        requested["FIntDebugForceMSAASamples"] = samples;
+      }
+      std::string merged;
+      std::string error;
+      ASSERT_TRUE(MergeRuntimeClientSettingsOverrides(
+          ParseFrameRatePolicy("144"), policy, requested.dump(), &merged,
+          &error)) << error;
+      const auto parsed = nlohmann::json::parse(merged);
+      EXPECT_FALSE(parsed.contains(""));
+      if (samples.empty()) {
+        EXPECT_FALSE(parsed.contains("FIntDebugForceMSAASamples"));
+      } else {
+        EXPECT_EQ(parsed.at("FIntDebugForceMSAASamples"), samples);
+      }
+    }
+  }
+}
+
 TEST(PerformancePolicyTest, PreservesExplicitAssetCacheByteBudgets) {
   const nlohmann::json requested = {
       {"FIntMeshContentProviderForceCacheSize", "268435456"},

tests/webview_helper_launcher_test.cc

@@ -312,10 +312,13 @@ TEST(WebViewHelperLauncherTest, SendsNormalizedInternalRouteToHelper) {
   ASSERT_TRUE(
       WriteExecutable(helper, "#!/bin/sh\ncat > '" + output.string() + "'\n"));
 
+  auto exit_probe = std::make_shared<ExitProbe>();
   const WebViewHelperLaunchResult result =
-      LaunchWebViewHelper(helper, "www:games/servers-section/987654321");
+      LaunchWebViewHelper(helper, "www:games/servers-section/987654321",
+                          WebViewHelperExitObserver{exit_probe, &RecordExit});
   ASSERT_TRUE(result) << result.error;
-  ASSERT_TRUE(WaitForFile(output, std::chrono::seconds(2)));
+  // Redirection creates the file before cat writes it; wait for completion.
+  ASSERT_TRUE(WaitForExit(exit_probe, std::chrono::seconds(2)));
 
   std::ifstream input(output);
   const std::string request((std::istreambuf_iterator<char>(input)),