I'm having some problems trying to figure out why my application won't draw the triangle I'm telling it to draw on the screen. After every single gl call in my code I check if glGetError() isn't equal to GL_NO_ERRORS, however it always is so I don't have any errors or anything to use when debugging. I'm literally clueless as to why my application won't render the triangle. The only thing that the window displays is a grey background since I set the clear color to be grey.

It would be nice to get some tips as to what to do when your OpenGL window isn't displaying anything and glGetError() returns nothing of use.

Hello. If you can seem to see your triangle it could be a number of things.

You haven't attached your program.

Your view port hasn't been initialised

You haven't drawn the correct number of vertices.

You haven't copied across the correct number of vertices. 

Check you call your draw after you set the background and before you present.

A third party tool that is very useful to check your graphics pipeline and that could highlight what the issue is render doc. It's free.

Or if you have your code on github,  I could review it. 

18 hours ago, Kearney401 said:

Hello. If you can seem to see your triangle it could be a number of things.

You haven't attached your program.

Your view port hasn't been initialised

You haven't drawn the correct number of vertices.

You haven't copied across the correct number of vertices. 

Check you call your draw after you set the background and before you present.

A third party tool that is very useful to check your graphics pipeline and that could highlight what the issue is render doc. It's free.

Or if you have your code on github,  I could review it. 

Ah so there are no sort of "general guidelines" that help debugging OpenGL in general?

I managed to fix the issue I was having though, I was sending the size of  a single float multiplied by the total amount of vertices in the mesh instead of sending the size of an entire vertex multiplied by the total amount of vertices.

Also, I kinda try to stay away from 3rd party debugging tools since I figure it would be better to learn to manually debug OpenGL in order to learn more about it.

Thanks for the help!

And if there are any tips for debugging OpenGL though it would still be awesome if anyone could post them ^^