On Sat, 21 Dec 2019 02:05:59 +0900 TAEHO NAM kl0ud3v@gmail.com wrote:

Hi, I'm new to dri-devel and sorry if this question doesn't fit here. In my code, the case 1 of getting eglDisplay using EGL_DEFAULT_DISPLAY failed, but, the case 2 succeeded.

// Case 1 egl_.display = eglGetDisplay (EGL_DEFAULT_DISPLAY);

// Case 2 struct gbm_device * gbm_device_; gbm_device_ = gbm_create_device (drm _-> GetFD ()); egl_.display = eglGetDisplay ((EGLNativeDisplayType) gbm_device_);

I don't know if EGL_DEFAULT_DISPLAY is missing or it's a problem with my machine. The output of lspci is :

VGA compatible controller: Intel Corporation Device 5906 (rev 02)

Thank you for any comments or links to related documents.

Hi,

please use the API that comes with https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_platform_base.tx... and the related platform extensions for each particular platform. I'm not sure if your issue comes from this, but without these the EGL implementation cannot now what platform EGL_DEFAULT_DISPLAY should refer to. It might as well be attempting to connect to an X11 server instead of realizing you actually wanted to use GBM and not X11.

See also https://www.khronos.org/registry/EGL/extensions/MESA/EGL_MESA_platform_gbm.t...

Thanks, pq