Tag RG memoryless resources only when supported in API

Author: raquelpeces

Packages/com.unity.render-pipelines.core/Runtime/RenderGraph/Compiler/NativePassCompiler.cs

@@ -901,6 +901,10 @@ void DetectMemoryLessResources()
         {
             using (new ProfilingScope(ProfilingSampler.Get(NativeCompilerProfileId.NRPRGComp_DetectMemorylessResources)))
             {
+                // No need to go further if we don't support memoryless textures
+                if (!SystemInfo.supportsMemorylessTextures)
+                    return;
+
                 // Native renderpasses and create/destroy lists have now been set-up. Detect memoryless resources, i.e resources that are created/destroyed
                 // within the scope of an nrp
                 foreach (ref readonly var nativePass in contextData.NativePasses)

Packages/com.unity.render-pipelines.core/Tests/Editor/NativePassCompilerRenderGraphTests.cs

@@ -854,7 +854,7 @@ public void MemorylessWorks()
             Assert.AreEqual(2, firstUsed.Count);
             Assert.AreEqual(renderTargets.extraTextures[0].handle.index, firstUsed[1].index);
             ref var info = ref result.contextData.UnversionedResourceData(firstUsed[1]);
-            Assert.AreEqual(true, info.memoryLess);
+            Assert.AreEqual(SystemInfo.supportsMemorylessTextures, info.memoryLess);
 
             // Pass 1 : last used = {depthBuffer, extraTextures[0], backBuffer}
             List<ResourceHandle> lastUsed = new List<ResourceHandle>();

Packages/com.unity.render-pipelines.core/Tests/Editor/RenderGraphTests.cs

@@ -6,6 +6,7 @@
 using UnityEngine.TestTools;
 using Unity.Collections;
 using UnityEngine.Rendering.RendererUtils;
+using System.Text.RegularExpressions;
 
 #if UNITY_EDITOR
 using UnityEditor;
@@ -1079,6 +1080,11 @@ public void RenderGraphMultisampledShaderResolvePassWorks()
         {
             m_RenderGraphTestPipeline.recordRenderGraphBody = (context, camera, cmd) =>
             {
+                if (!SystemInfo.supportsMultisampledShaderResolve)
+                {
+                    return; // Skip the test if the platform does not support multisampled shader resolve
+                }
+
                 var colorTexDesc = new TextureDesc(Vector2.one, false, false)
                 {
                     width = 4,
@@ -2023,8 +2029,14 @@ public void CastToRTHandle_WithMemorylessResource()
                                 transientColorRTHandle = (RTHandle)data.transientColorOutputHandle;
                             });
 
+                            if (!SystemInfo.supportsMemorylessTextures)
+                            {
+                                Assert.IsTrue(createdDepthRTHandle.rt.memorylessMode == RenderTextureMemoryless.None);
+                                Assert.IsTrue(createdColorRTHandle.rt.memorylessMode == RenderTextureMemoryless.None);
+                                Assert.IsTrue(transientColorRTHandle.rt.memorylessMode == RenderTextureMemoryless.None);
+                            }
                             // And let's make sure that the RTHandles are memoryless, i.e. no memory is allocated in system memory
-                            if (msaaSamples != MSAASamples.None)
+                            else if (msaaSamples != MSAASamples.None)
                             {
                                 Assert.IsTrue(createdDepthRTHandle.rt.memorylessMode == (RenderTextureMemoryless.Depth | RenderTextureMemoryless.MSAA));
                                 Assert.IsTrue(createdColorRTHandle.rt.memorylessMode == (RenderTextureMemoryless.Color | RenderTextureMemoryless.MSAA));