From 0d7d6468dfcabb759ec40921e5da3a8598f1c770 Mon Sep 17 00:00:00 2001
From: Darren Wihandi <65404740+fairywreath@users.noreply.github.com>
Date: Sat, 22 Mar 2025 00:57:35 -0400
Subject: Add debugPrintfEXT support (#6659)

---
 source/slang/glsl.meta.slang            |  7 ++++++-
 tests/glsl-intrinsic/debug-printf.slang | 15 +++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 tests/glsl-intrinsic/debug-printf.slang

diff --git a/source/slang/glsl.meta.slang b/source/slang/glsl.meta.slang
index 9e6c6c3cc..de5a3fb66 100644
--- a/source/slang/glsl.meta.slang
+++ b/source/slang/glsl.meta.slang
@@ -9412,4 +9412,9 @@ __intrinsic_op($(kIROp_NonUniformResourceIndex))
 [require(cpp_cuda_glsl_hlsl_spirv, nonuniformqualifier)]
 public T nonuniformEXT(T index);
 
-
+/// Debug output printing
+[ForceInline]
+public void debugPrintfEXT<each T>(NativeString format, expand each T args)
+{
+    printf(format, args);
+}
diff --git a/tests/glsl-intrinsic/debug-printf.slang b/tests/glsl-intrinsic/debug-printf.slang
new file mode 100644
index 000000000..4146eab04
--- /dev/null
+++ b/tests/glsl-intrinsic/debug-printf.slang
@@ -0,0 +1,15 @@
+//TEST:SIMPLE(filecheck=CHECK_SPIRV): -target spirv -stage compute -entry main -allow-glsl
+//TEST:SIMPLE(filecheck=CHECK_GLSL): -target glsl -stage compute -entry main -allow-glsl
+
+void main()
+{
+    debugPrintfEXT("test");
+    debugPrintfEXT(R"(test1 "%d %d")", 5, 6);
+
+    // CHECK_SPIRV: %[[SET:[0-9]+]] = OpExtInstImport "NonSemantic.DebugPrintf"
+    // CHECK_SPIRV: {{.*}} = OpExtInst %{{[a-zA-Z0-9_]+}} %[[SET]] 1 %{{[a-zA-Z0-9_]+}}
+    // CHECK_SPIRV: {{.*}} = OpExtInst %{{[a-zA-Z0-9_]+}} %[[SET]] 1 %{{[a-zA-Z0-9_]+}} %int_5 %int_6
+
+    // CHECK_GLSL: debugPrintfEXT("test")
+    // CHECK_GLSL: debugPrintfEXT("test1 \"%d %d\"", 5, 6);
+}
-- 
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