Tests, documentation and fix

include/vk_mem_alloc.h

@@ -2074,6 +2074,21 @@ VMA_CALL_PRE void VMA_CALL_POST vmaGetAllocationMemoryProperties(
     VmaAllocation VMA_NOT_NULL allocation,
     VkMemoryPropertyFlags* VMA_NOT_NULL pFlags);
 
+
+#if VMA_EXTERNAL_MEMORY_WIN32
+/**
+\brief Given an allocation, returns Win32 Handle, that may be imported by other processes or APIs.
+
+`hTargetProcess` must be a valid handle to target process or NULL. If it's `NULL`, the function returns
+handle for the current process.
+
+If the allocation was created with `VMA_ALLOCATION_CREATE_EXPORT_WIN32_HANDLE_BIT` flag,
+the function fills `pHandle` with handle that can be used in target process.
+*/
+VMA_CALL_PRE VkResult VMA_CALL_POST vmaGetMemoryWin32HandleKHR(VmaAllocator VMA_NOT_NULL allocator,
+    VmaAllocation VMA_NOT_NULL allocation, HANDLE hTargetProcess, HANDLE* pHandle);
+#endif // VMA_EXTERNAL_MEMORY_WIN32
+
 /** \brief Maps memory represented by given allocation and returns pointer to it.
 
 Maps memory represented by given allocation to make it accessible to CPU code.
@@ -6345,7 +6360,7 @@ struct VmaAllocation_T
 #endif
 
 #if VMA_EXTERNAL_MEMORY_WIN32
-    VkResult GetWin32Handle(VmaAllocator hAllocator, HANDLE hTargetProcess, HANDLE* hHandle) const noexcept;
+    VkResult GetWin32Handle(VmaAllocator hAllocator, HANDLE hTargetProcess, HANDLE* hHandle) noexcept;
 #endif // VMA_EXTERNAL_MEMORY_WIN32
 
 private:
@@ -6363,7 +6378,7 @@ struct VmaAllocation_T
         void* m_pMappedData; // Not null means memory is mapped.
         VmaAllocation_T* m_Prev;
         VmaAllocation_T* m_Next;
-        mutable VmaWin32Handle m_Handle; // Win32 handle
+        VmaWin32Handle m_Handle; // Win32 handle
     };
     union
     {
@@ -11101,7 +11116,7 @@ void VmaAllocation_T::PrintParameters(class VmaJsonWriter& json) const
     }
 }
 #if VMA_EXTERNAL_MEMORY_WIN32
-VkResult VmaAllocation_T::GetWin32Handle(VmaAllocator hAllocator, HANDLE hTargetProcess, HANDLE* pHandle) const noexcept
+VkResult VmaAllocation_T::GetWin32Handle(VmaAllocator hAllocator, HANDLE hTargetProcess, HANDLE* pHandle) noexcept
 {
     // Where do we get this function from?
     auto pvkGetMemoryWin32HandleKHR = hAllocator->GetVulkanFunctions().vkGetMemoryWin32HandleKHR;
@@ -13127,12 +13142,6 @@ void VmaAllocator_T::ImportVulkanFunctions_Static()
         m_VulkanFunctions.vkGetDeviceImageMemoryRequirements = (PFN_vkGetDeviceImageMemoryRequirements)vkGetDeviceImageMemoryRequirements;
     }
 #endif
-#if VMA_EXTERNAL_MEMORY_WIN32
-    // Can only be fetched dynamically
-    m_VulkanFunctions.vkGetMemoryWin32HandleKHR = (PFN_vkGetMemoryWin32HandleKHR)m_VulkanFunctions.vkGetDeviceProcAddr(m_hDevice, "vkGetMemoryWin32HandleKHR");
-#else 
-    m_VulkanFunctions.vkGetMemoryWin32HandleKHR = VMA_NULL;
-#endif
 }
 
 #endif // VMA_STATIC_VULKAN_FUNCTIONS == 1

src/Tests.cpp

@@ -8253,6 +8253,34 @@ static void TestMappingHysteresis()
     }
 }
 
+
+static void TestWin32Handles()
+{
+#if VMA_EXTERNAL_MEMORY_WIN32
+    wprintf(L"Test Win32 handles\n");
+    VkBufferCreateInfo bufCreateInfo = { VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO };
+    bufCreateInfo.size = 1024;
+    bufCreateInfo.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
+    VmaAllocationCreateInfo allocCreateInfo = {};
+    allocCreateInfo.usage = VMA_MEMORY_USAGE_AUTO;
+    VkBuffer buf;
+    VmaAllocation alloc;
+    VmaAllocationInfo allocInfo;
+    TEST(vmaCreateBuffer(g_hAllocator, &bufCreateInfo, &allocCreateInfo, &buf, &alloc, &allocInfo) == VK_SUCCESS);
+    HANDLE handle;
+    HANDLE handle2;
+    TEST(vmaGetMemoryWin32HandleKHR(g_hAllocator, alloc, nullptr, &handle) == VK_SUCCESS);
+    TEST(handle != nullptr);
+    TEST(vmaGetMemoryWin32HandleKHR(g_hAllocator, alloc, nullptr, &handle2) == VK_SUCCESS);
+    TEST(handle2 != nullptr);
+    TEST(handle2 != handle);
+
+    vmaDestroyBuffer(g_hAllocator, buf, alloc);
+    TEST(CloseHandle(handle));
+    TEST(CloseHandle(handle2));
+#endif
+}
+
 void Test()
 {
     wprintf(L"TESTING:\n");
@@ -8295,6 +8323,7 @@ void Test()
     TestMappingHysteresis();
     TestDeviceLocalMapped();
     TestMaintenance5();
+    TestWin32Handles();
     TestMappingMultithreaded();
     TestLinearAllocator();
     ManuallyTestLinearAllocator();