Add SV_DrawIndex. (#5787)

Co-authored-by: Ellie Hermaszewska <ellieh@nvidia.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/spirv/draw-index.slang b/tests/spirv/draw-index.slang
new file mode 100644
index 000000000..9020eb8b4
--- /dev/null
+++ b/tests/spirv/draw-index.slang
@@ -0,0 +1,18 @@
+//TEST:SIMPLE(filecheck=SPIRV): -target spirv
+//TEST:SIMPLE(filecheck=SPIRV): -target spirv -entry vsMain -stage vertex -emit-spirv-via-glsl
+//TEST:SIMPLE(filecheck=GLSL): -target glsl -entry vsMain -stage vertex
+
+// SPIRV: OpDecorate %{{.*}} BuiltIn DrawIndex
+// GLSL: gl_DrawID
+
+struct VertexIn
+{
+    float3 position;
+    int drawIndex : SV_DrawIndex;
+}
+
+[shader("vertex")]
+float4 vsMain(VertexIn vin) : SV_Position
+{
+    return float4(vin.position, vin.drawIndex);
+}