End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
OpenGL 기초 요약 1: 기본 타입, 색상 변경, 점, 선, 사각형, 다각형 http://yoonbumtae.com/?p=907