First pass support for half on vk (#912)

* Look at getting half to work on vk.

* Alter half test so can always produce consistent test results.

* First pass working half on vk.

* Improve comments for vulkan extensions around half.

* Upgraded vulkan headers to v1.1.103

https://github.com/KhronosGroup/Vulkan-Headers

* * Add getFeatures on Render interface
* Vulkan renderer determines at startup if it can support half
* Parse render-features on render-test

* Small changes to half-calc.slang test.

* Structured buffer half access works as expected for Vk, but isn't for dx12, so disable for now.

* Require the half feature for renderers for the half-structured-buffer.slang test.

* * Added ToolReturnCode to be more rigerous about how a return code is passed back from a tool
* Added support for a tool being able to pass back an 'ignored' result.
* Used enum codes to indicate meanings
* Made spawnAndWait return a ToolReturnCode

* Ignore tests that don't have required render-feature

* Fix macro line continuation usage.

* Check dx12 has half support.

* Checking for half on dx12 - if CheckFeatureSupport fails, don't fail renderer initialization.

* Fix typo.

1 files changed, 2 insertions, 0 deletions

diff --git a/tools/render-test/options.h b/tools/render-test/options.h
index 6c1482ab4..7b55b9ac0 100644
--- a/tools/render-test/options.h
+++ b/tools/render-test/options.h
@@ -55,6 +55,8 @@ struct Options
     int slangArgCount = 0;
 
     bool useDXIL = false;
+
+    Slang::List<Slang::String> renderFeatures;          /// Required render features for this test to run
 };
 
 extern Options gOptions;