From 6f2ce72b038b34e84819ddfc5d658166ed879eaa Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Thu, 27 Feb 2025 16:57:52 -0800
Subject: Map `SV_InstanceID` to `gl_InstanceIndex-gl_BaseInstance` (#6468)

* Map `SV_InstanceID` to `gl_InstanceIndex-gl_BaseInstance`

* Fix ci.
---
 tests/spirv/sv_instance.slang | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 tests/spirv/sv_instance.slang

(limited to 'tests/spirv')

diff --git a/tests/spirv/sv_instance.slang b/tests/spirv/sv_instance.slang
new file mode 100644
index 000000000..e71c6c7fa
--- /dev/null
+++ b/tests/spirv/sv_instance.slang
@@ -0,0 +1,14 @@
+//TEST:SIMPLE(filecheck=GLSL): -target glsl -entry vertMain -stage vertex
+//TEST:SIMPLE(filecheck=CHECK): -target spirv
+
+// CHECK-DAG: %[[REG1:[0-9a-zA-Z_]+]] = OpLoad %int %gl_BaseInstance
+// CHECK-DAG: %[[REG2:[0-9a-zA-Z_]+]] = OpLoad %int %gl_InstanceIndex
+// CHECK-DAG: OpISub %int %[[REG2]] %[[REG1]]
+
+// GLSL: gl_InstanceIndex - gl_BaseInstance
+
+[shader("vertex")]
+float4 vertMain(int i : SV_InstanceID) : SV_Position
+{
+    return i;
+}
\ No newline at end of file
-- 
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