From a53b85ad93187311ce8bf6c04cc3dd6f13c36f0e Mon Sep 17 00:00:00 2001
From: Swung0x48 <swung0x48@outlook.com>
Date: Sun, 20 Sep 2026 08:21:24 -0400
Subject: [PATCH] [MG_Backend] (Disaggregated): memoize immutable wire vertex
 format capabilities

---
 .../DirectVulkan/Renderer/VertexInputStateFactory.cpp | 11 +++++++++++
 .../DirectVulkan/Renderer/VertexInputStateFactory.h   |  5 +++++
 2 files changed, 16 insertions(+)

diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.cpp b/MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.cpp
index 1beb78ad..fda938d4 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.cpp
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.cpp
@@ -787,6 +787,17 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         if (m_physicalDevice == VK_NULL_HANDLE || format == VK_FORMAT_UNDEFINED) {
             return false;
         }
+#if MOBILEGL_BUILD_DISAGGREGATED
+        if (MG_Config::Transport != MG_Config::TransportMode::Monolith) {
+            const auto found = m_wireVertexFormatSupport.find(format);
+            if (found != m_wireVertexFormatSupport.end()) return found->second;
+            VkFormatProperties properties{};
+            vkGetPhysicalDeviceFormatProperties(m_physicalDevice, format, &properties);
+            const Bool supported = (properties.bufferFeatures & VK_FORMAT_FEATURE_VERTEX_BUFFER_BIT) != 0;
+            m_wireVertexFormatSupport.emplace(format, supported);
+            return supported;
+        }
+#endif
         VkFormatProperties properties{};
         vkGetPhysicalDeviceFormatProperties(m_physicalDevice, format, &properties);
         return (properties.bufferFeatures & VK_FORMAT_FEATURE_VERTEX_BUFFER_BIT) != 0;
diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.h b/MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.h
index f974c02c..bb602cc4 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.h
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.h
@@ -183,6 +183,11 @@ namespace MobileGL::MG_Backend::DirectVulkan {
 
         const VulkanRendererConfig& m_config;
         VkPhysicalDevice m_physicalDevice = VK_NULL_HANDLE;
+#if MOBILEGL_BUILD_DISAGGREGATED
+        // Physical-device format capabilities never change during this factory's
+        // lifetime. The wire path rebuilds layouts without the legacy VAO memo.
+        mutable UnorderedMap<VkFormat, Bool> m_wireVertexFormatSupport;
+#endif
         // Values are heap-allocated: UnorderedMap is open-addressing, so INSERT
         // invalidates references to stored values - and so does ERASE, which shifts
         // the rest of the probe cluster into the hole and therefore moves entries