I need this in order to support depth formats that arent D32F.

Bug: b/128363727
Change-Id: I7016351207e433e668053ebaf4dbeb9f2f7936f2
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26888Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>