From 71885de27c973a73b7d020f5ebbe86e16b86d7e4 Mon Sep 17 00:00:00 2001
From: jsmall-nvidia <jsmall@nvidia.com>
Date: Mon, 18 Mar 2019 18:19:26 -0400
Subject: 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.
---
 tests/compute/half-calc.slang | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 tests/compute/half-calc.slang

(limited to 'tests/compute/half-calc.slang')

diff --git a/tests/compute/half-calc.slang b/tests/compute/half-calc.slang
new file mode 100644
index 000000000..b47678dae
--- /dev/null
+++ b/tests/compute/half-calc.slang
@@ -0,0 +1,32 @@
+//TEST(compute):COMPARE_COMPUTE:-dx12 -compute -use-dxil -profile cs_6_2 -render-features half
+//TEST(compute):COMPARE_COMPUTE:-vk -compute -use-dxil -profile cs_6_2 -render-features half
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):dxbinding(0),glbinding(0),out
+
+// Test for doing a calculation using half
+
+RWStructuredBuffer<float> outputBuffer;
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint tid = dispatchThreadID.x;
+    
+    //half2 v0 = { 1, -2 };
+    //half2 v1 = { -2, 4 };
+    
+    //half2 v2 = (v0 * 2.0f + v1);
+    
+    // This should work (it compiles on dxc, but slang doesn't seem to have overloads yet)
+    //half offset = length(v2);
+    
+    //half offset = v2.x + v2.y;
+    
+    half offset = 0.0f;
+    
+    half v = tid;
+    v *= half(3.0f);
+    v += half(1.0f);
+    v += offset;
+    
+    outputBuffer[tid] = v;
+}
\ No newline at end of file
-- 
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