Image atomics #20
Description
Atomic image operations in SPIRV are handled as getting a pointer to image data as a normal scalar and doing atomic operations on it.
- Add intrinsic to get a pointer to a texel (with format).
- Investigate how it's done in DXIL
- Add a feature switch in case the language doesn't support them
- Make sure the typeless atomics (Load/Store/Exchange) have overloads for floats.