From 4f54cccf0e0e06be38312e2ee97c2b50b82d7c10 Mon Sep 17 00:00:00 2001
From: pdeayton-nv <205388607+pdeayton-nv@users.noreply.github.com>
Date: Tue, 8 Jul 2025 18:26:34 -0700
Subject: Generate OpExecutionMode PointMode for tessellation shaders (#7662)

* Generate "OpExecutionMode PointMode" for tessellation shaders instead of the incorrect geometry and mesh shader specific "OpExecutionMode OutputPoints".

* Add a test case verifying the OpExecutionMode is correct.

Fixes #7660
---
 source/slang/slang-emit-spirv.cpp            |  2 +
 tests/spirv/hull-shader-outputtopology.slang | 60 ++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 tests/spirv/hull-shader-outputtopology.slang

diff --git a/source/slang/slang-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index 7f6202a7f..28862f5b8 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -5312,6 +5312,8 @@ struct SPIRVEmitContext : public SourceEmitterBase, public SPIRVEmitSharedContex
                             m = SpvExecutionModeVertexOrderCw;
                         else if (topologyType == OutputTopologyType::TriangleCCW)
                             m = SpvExecutionModeVertexOrderCcw;
+                        else if (topologyType == OutputTopologyType::Point)
+                            m = SpvExecutionModePointMode;
                         break;
                     }
                 }
diff --git a/tests/spirv/hull-shader-outputtopology.slang b/tests/spirv/hull-shader-outputtopology.slang
new file mode 100644
index 000000000..63c279528
--- /dev/null
+++ b/tests/spirv/hull-shader-outputtopology.slang
@@ -0,0 +1,60 @@
+//TEST:SIMPLE(filecheck=SPIRV_POINT):-target spirv -stage hull -entry hullMain_point
+//TEST:SIMPLE(filecheck=SPIRV_TRICW):-target spirv -stage hull -entry hullMain_triangle_cw
+//TEST:SIMPLE(filecheck=SPIRV_TRICCW):-target spirv -stage hull -entry hullMain_triangle_ccw
+
+// SPIRV_POINT: OpExecutionMode %hullMain_point PointMode
+// SPIRV_TRICW: OpExecutionMode %hullMain_triangle_cw VertexOrderCw
+// SPIRV_TRICCW: OpExecutionMode %hullMain_triangle_ccw VertexOrderCcw
+
+struct Out {
+    float x;
+};
+
+struct PatchConst {
+    float EdgeTessFactor[4] : SV_TessFactor;
+    float InsideTessFactor[2] : SV_InsideTessFactor;
+};
+
+PatchConst patchConst() {
+    PatchConst o;
+    o.EdgeTessFactor[0] = 1;
+    o.EdgeTessFactor[1] = 1;
+    o.EdgeTessFactor[2] = 1;
+    o.EdgeTessFactor[3] = 1;
+    o.InsideTessFactor[0] = 1;
+    o.InsideTessFactor[1] = 1;
+    return o;
+}
+
+[domain("quad")]
+[partitioning("integer")]
+[outputtopology("point")]
+[outputcontrolpoints(4)]
+[patchconstantfunc("patchConst")]
+Out hullMain_point() {
+    Out o;
+    o.x = 0;
+    return o;
+}
+
+[domain("quad")]
+[partitioning("integer")]
+[outputtopology("triangle_cw")]
+[outputcontrolpoints(4)]
+[patchconstantfunc("patchConst")]
+Out hullMain_triangle_cw() {
+    Out o;
+    o.x = 0;
+    return o;
+}
+
+[domain("quad")]
+[partitioning("integer")]
+[outputtopology("triangle_ccw")]
+[outputcontrolpoints(4)]
+[patchconstantfunc("patchConst")]
+Out hullMain_triangle_ccw() {
+    Out o;
+    o.x = 0;
+    return o;
+}
-- 
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