Vk: Lazily initialize physical device memory properties

Signed-off-by: Squareys <squareys@googlemail.com>

src/Magnum/Vk/PhysicalDevice.cpp

@@ -83,6 +83,10 @@ UnsignedInt PhysicalDevice::getQueueFamilyIndex(QueueFamily family) {
 }
 
 UnsignedInt PhysicalDevice::getMemoryType(UnsignedInt typeBits, VkFlags properties) {
+    if(_deviceMemoryProperties.memoryHeapCount == 0 && _deviceMemoryProperties.memoryTypeCount == 0) {
+        vkGetPhysicalDeviceMemoryProperties(_physicalDevice, &_deviceMemoryProperties);
+    }
+
     for (uint32_t i = 0; i < 32; i++) {
         if((typeBits & 1) != 0) {
             if((_deviceMemoryProperties.memoryTypes[i].propertyFlags & properties) == properties) {

src/Magnum/Vk/PhysicalDevice.h

@@ -64,8 +64,8 @@ class MAGNUM_VK_EXPORT PhysicalDevice {
         PhysicalDevice(const VkPhysicalDevice& device):
             _physicalDevice(device)
         {
-            // Gather physical device memory properties
-            vkGetPhysicalDeviceMemoryProperties(_physicalDevice, &_deviceMemoryProperties);
+            _deviceMemoryProperties.memoryHeapCount = 0;
+            _deviceMemoryProperties.memoryTypeCount = 0;
         }
 
         /** @brief Destructor */