Add a new slang-test option `-enable-debug-layers` (#7300)

* Add a new slang-test option `-enable-debug-layers`

A variable `disableDebugLayer` is renamed to `enableDebugLayers`,
and a corresponding command-line argument is added,
`-enable-debug-layers`.

The previous option `-disable-debug-layer` is still available, but it
prints a deprecation warning message.

The reason why it is added is to make the option available to both Debug
and Release. On Debug build, it will be enabled by default, and it will
be disabled on Release build. We should be able to not only disable it,
but also enable it on Release build.

Ideally this option should be enabled all the time, but currently there
are too many VUID error messages printed and we are enabling only for
Debug build for now.

Note that the CI/CD will run with the option disabled until we resolve
all of VUID errors.

1 files changed, 38 insertions, 1 deletions

diff --git a/tools/slang-test/options.cpp b/tools/slang-test/options.cpp
index da4f9cffe..aa538e75e 100644
--- a/tools/slang-test/options.cpp
+++ b/tools/slang-test/options.cpp
@@ -88,6 +88,8 @@ static bool _isSubCommand(const char* arg)
         "  -use-test-server               Run tests using test server\n"
         "  -use-fully-isolated-test-server  Run each test in isolated server\n"
         "  -capability <name>             Compile with the given capability\n"
+        "  -enable-debug-layers [true|false] Enable or disable Validation Layer for Vulkan\n"
+        "                                 and Debug Device for DX\n"
 #if _DEBUG
         "  -disable-debug-layers          Disable the debug layers (default enabled in debug "
         "build)\n"
@@ -120,6 +122,19 @@ static bool _isSubCommand(const char* arg)
     char const* const* argCursor = argv;
     char const* const* argEnd = argCursor + argCount;
 
+#if _DEBUG
+    // Enabling debug layers by default in debug builds.
+    // For DX12 it will use the debug layer, for Vulkan it will enable validation layers.
+    //
+    // CI/CD will explicitly disable this until we address all of VUID errors.
+    // https://github.com/shader-slang/slang/issues/4798
+    //
+    // When you run the Debug build locally, you may see more errors if not disabled with
+    // '-enable-debug-layers false'.
+    //
+    optionsOut->enableDebugLayers = true;
+#endif
+
     // first argument is the application name
     if (argCursor != argEnd)
     {
@@ -410,10 +425,32 @@ static bool _isSubCommand(const char* arg)
         {
             optionsOut->skipReferenceImageGeneration = true;
         }
+        else if (strcmp(arg, "-enable-debug-layers") == 0)
+        {
+            optionsOut->enableDebugLayers = true;
+
+            if (argCursor == argEnd)
+            {
+                stdError.print("error: expected operand for '%s'\n", arg);
+                showHelp(stdError);
+                return SLANG_FAIL;
+            }
+
+            // Check for false variants
+            const char* value = *argCursor++;
+            if (value[0] == 'f' || value[0] == 'F' || value[0] == 'n' || value[0] == 'N' ||
+                value[0] == '0' ||
+                ((value[0] == 'o' || value[0] == 'O') && (value[1] == 'f' || value[1] == 'F')))
+            {
+                optionsOut->enableDebugLayers = false;
+            }
+        }
 #if _DEBUG
         else if (strcmp(arg, "-disable-debug-layers") == 0)
         {
-            optionsOut->debugLayerEnabled = false;
+            stdError.print("warning: '-disable-debug-layers' is deprecated, use "
+                           "'-enable-debug-layers false'\n");
+            optionsOut->enableDebugLayers = false;
         }
 #endif
         else