starit: explicit pNext=nullptr + struct addr logging

Author: isygold

src/dxvk/dxvk_memory.cpp

@@ -1343,6 +1343,12 @@ namespace dxvk {
     DxvkDeviceMemory result = { };
     result.size = size;
 
+    // Force pNext to nullptr. Box64 may not properly marshal this field
+    // (its wrapper leaves pNext uninitialized on its local struct). We set
+    // it here redundantly as a compiler barrier to ensure the store survives.
+    // Without this, vkAllocateMemory can return VK_ERROR_OUT_OF_HOST_MEMORY
+    // on Turnip when pNext is a garbage pointer that matches a known extension sType.
+    memoryInfo.pNext = nullptr;
     // Diagnostic: log the exact VkMemoryAllocateInfo struct before call.
     // This verifies Box64 doesn't corrupt allocationSize or memoryTypeIndex.
     Logger::debug(str::format(
@@ -1352,6 +1358,10 @@ namespace dxvk {
       ", allocationSize=", memoryInfo.allocationSize,
       ", memoryTypeIndex=", memoryInfo.memoryTypeIndex,
       "}]"));
+    // Also log struct address for Box64 translation debugging
+    Logger::debug(str::format(
+      "DxvkMemoryAllocator: &memoryInfo=", (void*)&memoryInfo,
+      " sizeof=", sizeof(memoryInfo)));
     VkResult vr = vk->vkAllocateMemory(vk->device(), &memoryInfo, nullptr, &result.memory);
     if (vr) {
       Logger::err(str::format(
@@ -1367,6 +1377,7 @@ namespace dxvk {
       // This is a workaround for KGSL per-process allocation count limits
       // and potential race conditions in the kernel module.
       std::this_thread::sleep_for(std::chrono::milliseconds(10));
+      memoryInfo.pNext = nullptr;
       Logger::debug(str::format(
         "DxvkMemoryAllocator: vkAllocateMemory retry[VkMemoryAllocateInfo={",
         "sType=", memoryInfo.sType,