opengl es gets no display

[westernhiller]

Dear all,

I've been studying programming with opengl ES on RPI. I followed online tutorials at https://jan.newmarch.name/LinuxSound/Di ... yPiOpenGL/. And trianble.c and image.c compiled without problem. However, when I ran them via either SSH or via VNC client, I did see some text information about frame rate on console, just didn't see a window show up displaying the triangle or the image. BTW, I'm running Wheezy on RPI 2 model B.

Did I miss anything here?

Many thanks,

Hiller

[tvjon]

¨Did I miss anything here?¨

Yes, gles output goes only to displays attached directly to RPi.

[westernhiller]

I had a test connecting HDMI display to RPI. It did work. However, my target is a spi 3.5' LCD which uses some of GPIO pins of RPI. Somehow it doesn't work.

[tvjon]

HDMI

Official LCD display

viewforum.php?f=108

DPI using manyGPio pins, but alternative function, via

viewtopic.php?f=91&t=94424

as they are all GPU driven, unlike SPI, I2C, etc..

[ghans]

Use raspi2fb or fbcp :

https://github.com/AndrewFromMelbourne/raspi2fb
https://github.com/tasanakorn/rpi-fbcp

ghans

[westernhiller]

Many thanks, ghans! I'll have a try.

[westernhiller]

thanks ghans! with raspi2fb it works fine on spi LCD!