Specifying a pipeline tessellation state

Tessellation shaders are one of the optional, additional programmable shader stages that can be enabled in a graphics pipeline. But when we want to activate them, we also need to prepare a pipeline tessellation state.

How to do it...

1. Create a variable of type VkPipelineTessellationStateCreateInfo named tessellation_state_create_info. Use the following to initialize its members:
   • VK_STRUCTURE_TYPE_PIPELINE_TESSELLATION_STATE_CREATE_INFO value for sType
   • nullptr value for pNext
   • 0 value for flags
   • The number of control points (vertices) which form a patch for patchControlPoints

How it works...

To use tessellation shaders in our application, we need to enable a tessellationShader feature during a logical device creation, we need to write a source code for both tessellation control and evaluation shaders, we need to create a shader module (or two) for them, and we also need to prepare a pipeline tessellation state represented by a variable of type VkPipelineTessellationStateCreateInfo...