VK_Parameter_Zoo: add empty vkQueueSubmit before colour draws

util/test/demos/vk/vk_parameter_zoo.cpp

@@ -1877,6 +1877,25 @@ void main()
           vkUpdateDescriptorSetWithTemplateKHR(device, reftempldescset, reftempl, &resetrefdata);
       }
 
+      // make some empty submits
+      setMarker(queue, "before_empty");
+
+      {
+        std::vector<VkCommandBuffer> cmds = {};
+        VkSubmitInfo submit[2] = {vkh::SubmitInfo(cmds), vkh::SubmitInfo(cmds)};
+        CHECK_VKR(vkQueueSubmit(queue, 2, submit, VK_NULL_HANDLE));
+
+        CHECK_VKR(vkQueueSubmit(queue, 0, (const VkSubmitInfo *)0x1234, VK_NULL_HANDLE));
+      }
+      if(hasExt(VK_KHR_SYNCHRONIZATION_2_EXTENSION_NAME))
+      {
+        VkSubmitInfo2KHR submit = {VK_STRUCTURE_TYPE_SUBMIT_INFO_2_KHR};
+        CHECK_VKR(vkQueueSubmit2KHR(queue, 1, &submit, VK_NULL_HANDLE));
+
+        CHECK_VKR(vkQueueSubmit2KHR(queue, 0, (const VkSubmitInfo2 *)0x4567, VK_NULL_HANDLE));
+      }
+      setMarker(queue, "after_empty");
+
       // check the rendering with our parameter tests is OK
       {
         vkDeviceWaitIdle(device);
@@ -2038,6 +2057,8 @@ void main()
         Submit(2, 4, {cmd});
       }
 
+      // make some empty submits
+
       // finish with the backbuffer
       {
         vkDeviceWaitIdle(device);
@@ -2054,7 +2075,6 @@ void main()
       }
 
       // make some empty submits
-
       setMarker(queue, "before_empty");
 
       {