skip DXC when DXCompiler not available.

Author: hzqst

Tests/DiligentCoreTest/CMakeLists.txt

@@ -64,7 +64,7 @@ if(WEBGPU_SUPPORTED)
     target_link_libraries(DiligentCoreTest PRIVATE libtint)
 endif()
 
-if(PLATFORM_WIN32 AND NOT ${DILIGENT_NO_HLSL})
+if(PLATFORM_WIN32)
     copy_required_dlls(DiligentCoreTest
         DXC_REQUIRED YES
     )

Tests/DiligentCoreTest/src/ShaderTools/SPIRVShaderResourcesTest.cpp

@@ -244,13 +244,20 @@ void TestSPIRVResources(const char*                                       FilePa
 
     if (!IsGLSL)
     {
-        //Test with DXC
-        const auto& SPIRV_DXC = LoadSPIRVFromHLSL(FilePath, ShaderType, true);
-        ASSERT_FALSE(SPIRV_DXC.empty()) << "Failed to compile HLSL to SPIRV with DXC: " << FilePath;
+        if (g_pDXCompiler && g_pDXCompiler->IsLoaded())
+        {
+            //Test with DXC
+            const auto& SPIRV_DXC = LoadSPIRVFromHLSL(FilePath, ShaderType, true);
+            ASSERT_FALSE(SPIRV_DXC.empty()) << "Failed to compile HLSL to SPIRV with DXC: " << FilePath;
 
-        LOG_INFO_MESSAGE("Testing with HLSL->SPIRV with DXC:\n", FilePath);
+            LOG_INFO_MESSAGE("Testing with HLSL->SPIRV with DXC:\n", FilePath);
 
-        TestSPIRVResourcesInternal(FilePath, RefResources, SPIRV_DXC, ShaderType, CombinedSamplerSuffix);
+            TestSPIRVResourcesInternal(FilePath, RefResources, SPIRV_DXC, ShaderType, CombinedSamplerSuffix);
+        }
+        else
+        {
+            LOG_INFO_MESSAGE("HLSL->SPIRV with DXC skipped because DXCompiler is not available:\n", FilePath);
+        }
     }
 }