Specifying dependencies between subpasses

When operations in a given subpass depend on the results of operations in one of the earlier subpasses in the same render pass, we need to specify subpass dependencies. This is also required if there are dependencies between operations recorded within a render pass and those performed before it, or between operations that are executed after a render pass and those performed within the render pass. It is also possible to define dependencies within a single subpass.

Note

Defining subpass dependencies is similar to setting up memory barriers.

How to do it...

1. Create a variable of type std::vector<VkSubpassDependency> named subpass_dependencies. For each dependency, add a new element to the subpass_dependencies vector and use the following values for its members:
   • The index of a subpass from which ("producing") operations should be finished before the second set of ("consuming") operations (or a VK_SUBPASS_EXTERNAL value for commands before the render...