is unity texture coordinate (0,0) at bottom left?

Unity Engine
1

hi all

i’m not sure the unity texture coordinate for origin (0,0) is at bottom left, because d3d is at top left and opengl is at left bottom.
if i want access texture coordinate in my custom shader, should i flip y coodinate when necessary?
how’s the unity defined?

2 
#if UNITY_UV_STARTS_AT_TOP
#endif