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, 30 insertions, 0 deletions

diff --git a/tests/compute/half-structured-buffer.slang b/tests/compute/half-structured-buffer.slang
new file mode 100644
index 000000000..e67aba55e
--- /dev/null
+++ b/tests/compute/half-structured-buffer.slang
@@ -0,0 +1,30 @@
+//TEST(compute):COMPARE_COMPUTE:-vk -compute -profile cs_6_2 -render-features half
+//Disable on Dx12 for now - because writing to structured buffer produces unexpected results
+//DISABLE_TEST(compute):COMPARE_COMPUTE:-dx12 -compute -use-dxil -profile cs_6_2 -render-features half
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0], stride=16):dxbinding(0),glbinding(0),out
+
+struct Thing
+{
+    uint pos;
+    float radius;
+    half4 color;
+};
+
+RWStructuredBuffer<Thing> outputBuffer;
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint tid = dispatchThreadID.x;
+    
+    float v = float(tid);
+    
+    float base = v* 4.0f;
+    
+    Thing thing;
+    thing.pos = tid;
+    thing.color = half4(base, base + 1.0f, base + 2.0f, base + 3.0f);    
+    thing.radius = v;
+    
+    outputBuffer[tid] = thing;
+}
\ No newline at end of file