SUBPASS_CONTENTS_INLINE specifies that the contents of the subpass will be recorded inline in the primary command buffer, and secondary command buffers must not be executed within the subpass.

SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS specifies that the contents are recorded in secondary command buffers that will be called from the primary command buffer, and cmdExecuteCommands is the only valid command in the command buffer until cmdNextSubpass or cmdEndRenderPass.

SUBPASS_CONTENTS_INLINE_AND_SECONDARY_COMMAND_BUFFERS_EXT specifies that the contents of the subpass can be recorded both inline and in secondary command buffers executed from this command buffer with cmdExecuteCommands.