> On May 24, 2017, at 7:18 PM, Graeme Geldenhuys
> <mailingli...@geldenhuys.co.uk> wrote:
>
>> Any ideas on what’s wrong with this?
>
Ok, I got an answer from a person on YouTube and figured this out.
The problem was 1) that SDL is returning a different version then I asked for
and I didn’t do proper error checking. glEnableVertexAttribArray was failing
for example because with OpenGL 4.1 (or earlier) a VAO is required before using
VBO’s and 2) again, since 4.x, a shader is required to even draw white
triangle. The demos I saw must have been on some version of 3.x but I was on
4.1.
I’m still now sure how to guarantee SDL returns the version I want and it looks
in your code you didn’t even try to specify anything besides core
compatibility, not that it makes any difference because I always get 4.1 on my
Mac or 2.1 and GLSL 1.2 for legacy mode. This begs the question of how I can
write shaders if on any given computer I get a different version of GLSL.
At least I got it working FINALLY after so much hassle but everything I do
could easily break on others computers so...
Regards,
Ryan Joseph
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