A collection of functions used by cmds objects to do deferred cmd recording. Modern API's support command buffer recording of gfx commands ('deferred'). Meaning: No commands are executed on the GPU until we Submit the cmd buffer.
OpenGL uses 'immediate' mode instead where gfx commands are immediately processed and given to the GPU at a time of the drivers choosing. We use 'Ops' functions to record our OpenGL function in a list and only execute them in OpenGL during the SubmitCmds phase.
This has two benefits:
- OpenGL behaves more like Metal and Vulkan. So when clients write Hgi code they get similar behavior in gpu command execution across all backends. For example, if you are running with HgiGL and recording commands into a Hgi***Cmds object and forget to call 'SubmitCmds' you will notice that your commands are not executed on the GPU, just like what would happen if you were running with HgiMetal.
- It lets us satisfy the Hgi requirement that Hgi***Cmds objects must be able to do their recording on secondary threads.
Definition at line 70 of file ops.h.
1.8.6 
