Creating a uniform buffer

In Vulkan, uniform variables used inside shaders cannot be placed in a global namespace. They can be defined only inside uniform buffers. For these, we need to create buffers with a VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT usage.

How to do it...

1. Take the created logical device and use its handle to initialize a variable of type VkDevice named logical_device.
2. Create a variable of type VkBuffer named uniform_buffer. It will hold the handle of the created buffer.

 

3. Create a buffer using a logical_device variable and specifying the desired size and usage. The latter must contain at least a VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT flag. Store the handle of the buffer in the uniform_buffer variable (refer to the Creating a buffer recipe from Chapter 4, Resources and Memory).
4. Allocate a memory object with a VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT property (or use a range of an existing memory object) and bind it to the buffer (refer to the Allocating and binding memory object to a buffer recipe...