I would like to purchase a Mac computer specifically for AppGameKit to develop MacOS and iOS applications. I was looking at the requirements on Steam and while the minimum requirements mentioning graphics with OpenGL 2 support, the recommended is graphics with OpenGL 4 support. The trouble is, I develop mainly on my Windows PC and I don't really need a new PC, so I would be using a Mac only for testing and to compile for MacOS and iOS. For that reason, I would like to keep the price below £200 and I would prefer some sort of MacBook as I wont be using it daily and I don't want to dedicate an area of my desk to an old iMac. At the moment I'm looking at options on eBay but the ones I could afford are coming with OpenGL 2 and some with OpenGL 3 support which is technically might work, but I would like to get some opinion on that if it safe to buy a Mac today in 2018 that is support OpenGL 2 only or 3, or should I really consider to buy one that is support OpenGL 4?
I did find some refurbished 2011 MacBook Pro and iMac with OpenGL 4 support around £400 but it is the kind of money I don't really want to spend on something I would be not using much and to be honest many of them is in horrible condition, broken dent cases, missing keys, cracked screens, no power cord, dead battery, dead speaker, dead USB, dead something... I can't accept anything like that for this amount of money. For £200-250 I did find some 2009-2010 MacBook in acceptable condition but the hardware is very old and support only OpenGL 3.
The trouble is I don't want to find my self limited because of the old shader model, but I'm not sure if I should I expect any limitation or not and what sort of limitation.
The games I'm making doesn't need much RAM, CPU and VRAM so I think even an old 2009-2010 MacBook would be enough, but I'm not sure about the shader model of the GPU if that would be ok or not. For example would the shader pack and games pack work with OpenGL 3?
I would appreciate any feedback.