Enable D3D12 experimental feature to use coopvec (#6290)

This commit enables "D3D12-experimenta-feature" in render-test.
This is required to use CoopVec feature with dxcompiler.dll.

But it is enabled only when "-dx12-experimental" is used, because it appears that DX12 becomes unstable when the experimental feature is enabled, which causes bunch of tests randomly failing.

3 files changed, 24 insertions, 0 deletions

diff --git a/tools/render-test/options.cpp b/tools/render-test/options.cpp
index ce438046a..11b291c68 100644
--- a/tools/render-test/options.cpp
+++ b/tools/render-test/options.cpp
@@ -253,6 +253,10 @@ static rhi::DeviceType _toRenderType(Slang::RenderApiType apiType)
         {
             outOptions.enableBackendValidation = true;
         }
+        else if (argValue == "-dx12-experimental")
+        {
+            outOptions.dx12Experimental = true;
+        }
         else
         {
             // Lookup
diff --git a/tools/render-test/options.h b/tools/render-test/options.h
index 9a30030f7..c95edee21 100644
--- a/tools/render-test/options.h
+++ b/tools/render-test/options.h
@@ -89,6 +89,8 @@ struct Options
 
     bool enableBackendValidation = false;
 
+    bool dx12Experimental = false;
+
     Options() { downstreamArgs.addName("slang"); }
 
     static SlangResult parse(
diff --git a/tools/render-test/render-test-main.cpp b/tools/render-test/render-test-main.cpp
index a8bd00bd4..a167a4a27 100644
--- a/tools/render-test/render-test-main.cpp
+++ b/tools/render-test/render-test-main.cpp
@@ -13,6 +13,10 @@
 #include "slang-support.h"
 #include "window.h"
 
+#if defined(_WIN32)
+#include <d3d12.h>
+#endif
+
 #include <slang-rhi.h>
 #include <slang-rhi/acceleration-structure-utils.h>
 #include <slang-rhi/shader-cursor.h>
@@ -1391,6 +1395,20 @@ static SlangResult _innerMain(
         desc.requiredFeatures = requiredFeatureList.getBuffer();
         desc.requiredFeatureCount = (int)requiredFeatureList.getCount();
 
+#if defined(_WIN32)
+        // When the experimental feature is enabled, things become unstable.
+        // It is enabled only when requested.
+        D3D12ExperimentalFeaturesDesc experimentalFD = {};
+        UUID features[1] = {D3D12ExperimentalShaderModels};
+        experimentalFD.featureCount = 1;
+        experimentalFD.featureIIDs = features;
+        experimentalFD.configurationStructs = nullptr;
+        experimentalFD.configurationStructSizes = nullptr;
+
+        if (options.dx12Experimental)
+            desc.next = &experimentalFD;
+#endif
+
         // Look for args going to slang
         {
             const auto& args = options.downstreamArgs.getArgsByName("slang");