Enable shaderStorageImageMultisample at capture time for MSAA stores

* We need this to be able to add STORAGE_BIT to the image even if we don't do
  MSAA stores at capture time

renderdoc/driver/vulkan/vk_msaa_array_conv.cpp

@@ -32,7 +32,8 @@
 void VulkanDebugManager::CopyTex2DMSToArray(VkImage destArray, VkImage srcMS, VkExtent3D extent,
                                             uint32_t layers, uint32_t samples, VkFormat fmt)
 {
-  if(!m_pDriver->GetDeviceEnabledFeatures().shaderStorageImageWriteWithoutFormat)
+  if(!m_pDriver->GetDeviceEnabledFeatures().shaderStorageImageWriteWithoutFormat ||
+     !m_pDriver->GetDeviceEnabledFeatures().shaderStorageImageMultisample)
     return;
 
   if(m_MS2ArrayPipe == VK_NULL_HANDLE)

renderdoc/driver/vulkan/wrappers/vk_device_funcs.cpp

@@ -3559,6 +3559,15 @@ VkResult WrappedVulkan::vkCreateDevice(VkPhysicalDevice physicalDevice,
         "shaderStorageImageWriteWithoutFormat = false, multisampled textures will have empty "
         "contents at frame start.");
 
+  // even though we don't actually do any multisampled stores, this is needed to be able to create
+  // MSAA images with STORAGE_BIT usage
+  if(availFeatures.shaderStorageImageMultisample)
+    enabledFeatures.shaderStorageImageMultisample = true;
+  else
+    RDCWARN(
+        "shaderStorageImageMultisample = false, multisampled textures will have empty "
+        "contents at frame start.");
+
   // patch the enabled features
   if(enabledFeatures2)
     enabledFeatures2->features = enabledFeatures;