chenmingjie

i use raspberry pi 4b ，after make tutorial01_first_screen and run it, get out error: `GSurface != EGL_NO_SURFACE' failed.

1

tutorial01_first_screen: /home/pi/OpenGL_RPI_Tutorial/openGL-RPi-tutorial/common/startScreen.cpp:107: void InitGraphics(): Assertion `GSurface != EGL_NO_SURFACE' failed.