Support stage_switch. (#6311)

* Support stage_switch.

* Update proposal status.

* Fix gl_InstanceID.

* Fix.

1 files changed, 38 insertions, 0 deletions

diff --git a/tests/language-feature/stage-switch.slang b/tests/language-feature/stage-switch.slang
new file mode 100644
index 000000000..1bdd1f85a
--- /dev/null
+++ b/tests/language-feature/stage-switch.slang
@@ -0,0 +1,38 @@
+
+//TEST:SIMPLE(filecheck=CHECK):-target spirv
+
+float ddx_or(float val, float defaultVal)
+{
+    __stage_switch
+    {
+        case fragment:
+            return ddx(val);
+        default:
+            return defaultVal;
+    }
+}
+
+float intermediate(float val)
+{
+    return ddx_or(val, 1.0);
+}
+
+RWStructuredBuffer<float> output;
+
+[numthreads(1,1,1)]
+void computeMain()
+{
+    // CHECK-LABEL: %computeMain = OpFunction 
+    // CHECK: OpStore %{{.*}} %float_1
+    // CHECK: OpFunctionEnd
+    output[0] = intermediate(2.0);
+}
+
+[shader("fragment")]
+float4 fragmentMain(float vin) : SV_Target
+{
+    // CHECK-LABEL: %fragmentMain = OpFunction 
+    // CHECK: OpDPdx
+    // CHECK: OpFunctionEnd
+    return intermediate(vin);
+}
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