g-truc/ogl-samples

Calling glGetString(GL_EXTENSIONS) from a core profile

timothyja opened this issue · 5 comments

timothyja commented

glGetString(GL_EXTENSIONS) shouldn't be called from a core profile.

This is at least called when running ./build/Release/gl-320-primitive-sprite possibly elsewhere too.

See Mesa bug: https://bugs.freedesktop.org/show_bug.cgi?id=77582

lecbee commented

Updated info in the Mesa bug.
ogl-samples should not use GLEW given it doesn't support core profile (yet).

Groovounet commented

This is why the samples call glGetError right after glewInit.

It has been enough for the moment and I hope it will be enough for Mesa too.

I don't mind to update glew.c to use glGetStringi as it should do if that's necessary.

Thanks,
Christophe

lecbee commented

This is why the samples call glGetError right after glewInit.

There is no error checking of glGetError(). What is the purpose?
Ditto for glewInit() and glfwInit().

Anyway, I performed more tests and the fail comes previous that, from glfwCreateWindow() which returns NULL. I don't understand why.

lecbee commented

Ok that was my fault.
I had an old libGL in /usr/local/lib64 directory! è_é
Now ogl-samples works.

That said, is there a way to submit patchs to ogl-samples?

Groovounet commented

Sure, just submit a pull request with GitHub.

Thanks,
Christophe