From 2c7d99d5e8199d260319d77a21d6a9c14ce0e91a Mon Sep 17 00:00:00 2001
From: Swung0x48 <swung0x48@outlook.com>
Date: Tue, 29 Sep 2026 06:33:36 -0400
Subject: [PATCH] [Test] (P11 M): the server half of a split eglSwapInterval -
 Magma's backend object carries the request into its table's SetSwapInterval
 (null before dev@c60639db)

---
 MobileGL/MG_Test/SanityTest.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/MobileGL/MG_Test/SanityTest.cpp b/MobileGL/MG_Test/SanityTest.cpp
index c210723c..233b8c1e 100644
--- a/MobileGL/MG_Test/SanityTest.cpp
+++ b/MobileGL/MG_Test/SanityTest.cpp
@@ -16,6 +16,7 @@
 #include <MG_Backend/DirectGLES/BackendObject_DirectGLES.h>
 #include <MG_Backend/DirectGLES/Managers.h>
 #include <MG_Backend/DirectVulkan/BackendObject_DirectVulkan.h>
+#include <MG_Backend/DirectVulkan/DirectVulkan.h>
 #include <MG_Backend/BackendObjects.h>
 #include <MG_Impl/GLImpl/Buffer/GL_Buffer.h>
 #include <MG_Impl/GLImpl/Getter/GL_Getter.h>
@@ -321,6 +322,22 @@ TEST(DirectVulkanSanity, AdvertisesUniformBufferObjectAndStencilTexturing) {
               extensions.end());
 }
 
+// P11 M: THE SERVER HALF OF A SPLIT eglSwapInterval. The client's emit-table slot forwards the
+// call as one control frame (ServerLoopTest.TheEmitTableSwapIntervalSlotCrossesAsOneDispatchedFrame,
+// P10 B) and the server answers it with backend->SetEGLSwapInterval, whose base implementation
+// calls the backend table's SetSwapInterval. Magma's slot was null until dev@c60639db, so the
+// request was dropped there on every arm. Through the backend object, as the server calls it:
+// the request has to land where the next renderer and Present read it. No renderer exists here,
+// so nothing is rebuilt.
+TEST(DirectVulkanSanity, SetEglSwapIntervalReachesTheBackendTable) {
+    MobileGL::MG_Backend::DirectVulkan::BackendObject_DirectVulkan backend;
+    ASSERT_NE(backend.GetBackendFunctions().SetSwapInterval, nullptr);
+    backend.SetEGLSwapInterval(0);
+    EXPECT_EQ(MobileGL::MG_Backend::DirectVulkan::GetRequestedSwapInterval(), MobileGL::Optional<MobileGL::Int>(0));
+    backend.SetEGLSwapInterval(1);
+    EXPECT_EQ(MobileGL::MG_Backend::DirectVulkan::GetRequestedSwapInterval(), MobileGL::Optional<MobileGL::Int>(1));
+}
+
 // Voxy only ever needed the extensions, which stay advertised whatever the version is; the version
 // assertion just pins what the backend really reports, now that V_OpenGL40 is in the list.
 TEST(DirectGLESSanity, AdvertisesVoxyRequiredRenderingExtensions) {