Add slang-test check for D3D11 double support (#6761)

Fixes #6171

This commit adds logic for reporting double support
to the d3d11 backend, for running tests on GPUs that
do not support D3D11_FEATURE_DOUBLES, and add checks
for that support to tests that require the feature.

1 files changed, 13 insertions, 0 deletions

diff --git a/tools/gfx/d3d11/d3d11-device.cpp b/tools/gfx/d3d11/d3d11-device.cpp
index ab4670a17..b101c6d13 100644
--- a/tools/gfx/d3d11/d3d11-device.cpp
+++ b/tools/gfx/d3d11/d3d11-device.cpp
@@ -267,6 +267,19 @@ SlangResult DeviceImpl::initialize(const Desc& desc)
 #endif
     }
 
+    // Check double precision support
+    {
+        D3D11_FEATURE_DATA_DOUBLES doublePrecisionFeature = {};
+        if (SUCCEEDED(m_device->CheckFeatureSupport(
+                D3D11_FEATURE_DOUBLES,
+                &doublePrecisionFeature,
+                sizeof(doublePrecisionFeature))) &&
+            doublePrecisionFeature.DoublePrecisionFloatShaderOps)
+        {
+            m_features.add("double");
+        }
+    }
+
     {
         // Create a TIMESTAMP_DISJOINT query object to query/update frequency info.
         D3D11_QUERY_DESC disjointQueryDesc = {};