turnip: Support VK_EXT_transform_feedback
The first MR for #2514 (closed).
This MR makes it pass for dEQP-VK.transform_feedback.simple.* as the following:
- Test run totals:
- Passed: 111/436 (25.5%)
- Failed: 12/436 (2.8%)
- Not supported: 313/436 (71.8%)
- Warnings: 0/436 (0.0%)
12 failures are related to indirect draw, which is not implemented yet in turnip. We can manage these once we complete #2242 (closed)(I'll be working on it unless someone started already).
Also XFB query still needs to be implemented.
Aprat from them, is this MR worth to be getting review?