I'm using Intel Iris Pro 5200 for playing (MacBook Pro "15). And i have troubles with missing textures in games like GTA V, Mirror's Edge: Catalyst, Need For Speed 2016. Previously this issues not appeared. Windows 10 with last updates, last graphics driver for Intel Iris Pro 5200.
In regard to your inquiry, I just wanted to let you that, Apple has requested that all questions regarding Apple systems and software be addressed directly with Apple support.
So, in order to get assistance to try to fix the problem with the MacBook Pro "15, you just need to get in contact directly with them:
Apple’s phone number: 800-692-7753
Apple’s support site: https://www.apple.com/support/macbook/
Any questions, please let me know.