Updated ComputeRenderTargetFormatsHash to return 0 hash for no render targets and DSV

Author: TheMostDiligent

Graphics/GraphicsAccessories/src/GraphicsAccessories.cpp

@@ -3004,6 +3004,9 @@ std::vector<Uint32> ResolveInputLayoutAutoOffsetsAndStrides(LayoutElement* pLayo
 
 size_t ComputeRenderTargetFormatsHash(Uint32 NumRenderTargets, const TEXTURE_FORMAT RTVFormats[], TEXTURE_FORMAT DSVFormat)
 {
+    if (NumRenderTargets == 0 && DSVFormat == TEX_FORMAT_UNKNOWN)
+        return 0;
+
     size_t Hash = ComputeHash(NumRenderTargets);
     for (Uint32 rt = 0; rt < NumRenderTargets; ++rt)
         HashCombine(Hash, RTVFormats[rt]);

Tests/DiligentCoreTest/src/GraphicsAccessories/GraphicsAccessoriesTest.cpp

@@ -1537,7 +1537,14 @@ TEST(GraphicsAccessories_GraphicsAccessories, ComputeRenderTargetFormatsHash)
 
     auto Test = [&Hashes](Uint32 NumRenderTargets, const TEXTURE_FORMAT RTVFormats[], TEXTURE_FORMAT DepthFormat) {
         size_t Hash = ComputeRenderTargetFormatsHash(NumRenderTargets, RTVFormats, DepthFormat);
-        EXPECT_NE(Hash, size_t{0});
+        if (NumRenderTargets == 0 && DepthFormat == TEX_FORMAT_UNKNOWN)
+        {
+            EXPECT_EQ(Hash, size_t{0});
+        }
+        else
+        {
+            EXPECT_NE(Hash, size_t{0});
+        }
         EXPECT_TRUE(Hashes.insert(Hash).second);
     };