Gaea

With use_modular_headers, header file not found from Lib-umbrella.h(swift mix oc project)

1

# Report ## What did you do? ℹ Please replace these two lines with what you did. Such As Demo：https://github.com/shulong-apple/swift_mix_oc 1.Pod "Lib" depend Pod "Lib2", both them contain swift file...

MOD: support metal and opengl as the backend render simultaneously

2

使用变量代替宏判断，支持ios全系列机型。