HLSL: allow GS-specific methods in other stages

Using GS methods such as Append() in non-GS stages should be ignored, but was
creating errors due to the lack of a stream output symbol for the non-GS stage.

Test/baseResults/hlsl.fraggeom.frag.out

@@ -0,0 +1,112 @@
+hlsl.fraggeom.frag
+Shader version: 500
+gl_FragCoord origin is upper left
+0:? Sequence
+0:9  Function Definition: GS_Draw(struct-myVertex-vf41;struct-myVertex-vf41; ( temp void)
+0:9    Function Parameters: 
+0:9      'IN' ( in structure{ temp 4-component vector of float pos})
+0:9      'OutputStream' ( out structure{ temp 4-component vector of float pos})
+0:?     Sequence
+0:10      Constant:
+0:10        0.000000
+0:11      Constant:
+0:11        0.000000
+0:15  Function Definition: @main( ( temp 4-component vector of float)
+0:15    Function Parameters: 
+0:?     Sequence
+0:16      Branch: Return with expression
+0:16        Constant:
+0:16          0.000000
+0:16          0.000000
+0:16          0.000000
+0:16          0.000000
+0:15  Function Definition: main( ( temp void)
+0:15    Function Parameters: 
+0:?     Sequence
+0:15      move second child to first child ( temp 4-component vector of float)
+0:?         '@entryPointOutput' (layout( location=0) out 4-component vector of float)
+0:15        Function Call: @main( ( temp 4-component vector of float)
+0:?   Linker Objects
+0:?     '@entryPointOutput' (layout( location=0) out 4-component vector of float)
+
+
+Linked fragment stage:
+
+
+Shader version: 500
+gl_FragCoord origin is upper left
+0:? Sequence
+0:9  Function Definition: GS_Draw(struct-myVertex-vf41;struct-myVertex-vf41; ( temp void)
+0:9    Function Parameters: 
+0:9      'IN' ( in structure{ temp 4-component vector of float pos})
+0:9      'OutputStream' ( out structure{ temp 4-component vector of float pos})
+0:?     Sequence
+0:10      Constant:
+0:10        0.000000
+0:11      Constant:
+0:11        0.000000
+0:15  Function Definition: @main( ( temp 4-component vector of float)
+0:15    Function Parameters: 
+0:?     Sequence
+0:16      Branch: Return with expression
+0:16        Constant:
+0:16          0.000000
+0:16          0.000000
+0:16          0.000000
+0:16          0.000000
+0:15  Function Definition: main( ( temp void)
+0:15    Function Parameters: 
+0:?     Sequence
+0:15      move second child to first child ( temp 4-component vector of float)
+0:?         '@entryPointOutput' (layout( location=0) out 4-component vector of float)
+0:15        Function Call: @main( ( temp 4-component vector of float)
+0:?   Linker Objects
+0:?     '@entryPointOutput' (layout( location=0) out 4-component vector of float)
+
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 25
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Fragment 4  "main" 23
+                              ExecutionMode 4 OriginUpperLeft
+                              Source HLSL 500
+                              Name 4  "main"
+                              Name 8  "myVertex"
+                              MemberName 8(myVertex) 0  "pos"
+                              Name 13  "GS_Draw(struct-myVertex-vf41;struct-myVertex-vf41;"
+                              Name 11  "IN"
+                              Name 12  "OutputStream"
+                              Name 16  "@main("
+                              Name 23  "@entryPointOutput"
+                              Decorate 23(@entryPointOutput) Location 0
+               2:             TypeVoid
+               3:             TypeFunction 2
+               6:             TypeFloat 32
+               7:             TypeVector 6(float) 4
+     8(myVertex):             TypeStruct 7(fvec4)
+               9:             TypePointer Function 8(myVertex)
+              10:             TypeFunction 2 9(ptr) 9(ptr)
+              15:             TypeFunction 7(fvec4)
+              18:    6(float) Constant 0
+              19:    7(fvec4) ConstantComposite 18 18 18 18
+              22:             TypePointer Output 7(fvec4)
+23(@entryPointOutput):     22(ptr) Variable Output
+         4(main):           2 Function None 3
+               5:             Label
+              24:    7(fvec4) FunctionCall 16(@main()
+                              Store 23(@entryPointOutput) 24
+                              Return
+                              FunctionEnd
+13(GS_Draw(struct-myVertex-vf41;struct-myVertex-vf41;):           2 Function None 10
+          11(IN):      9(ptr) FunctionParameter
+12(OutputStream):      9(ptr) FunctionParameter
+              14:             Label
+                              Return
+                              FunctionEnd
+      16(@main():    7(fvec4) Function None 15
+              17:             Label
+                              ReturnValue 19
+                              FunctionEnd

Test/hlsl.fraggeom.frag

@@ -0,0 +1,17 @@
+// test geometry shader in fragment shader.  GS attributes should be successfully ignored.
+
+struct myVertex {
+    float4 pos : SV_Position;
+};
+
+[maxvertexcount(1)]
+void GS_Draw(point myVertex IN, inout PointStream<myVertex> OutputStream)
+{
+    OutputStream.Append(IN);
+    OutputStream.RestartStrip();
+}
+
+float4 main() : SV_TARGET
+{
+    return 0;
+}

gtests/Hlsl.FromFile.cpp

@@ -109,6 +109,7 @@ INSTANTIATE_TEST_CASE_P(
         {"hlsl.emptystruct.init.vert", "main"},
         {"hlsl.entry-in.frag", "PixelShaderFunction"},
         {"hlsl.entry-out.frag", "PixelShaderFunction"},
+        {"hlsl.fraggeom.frag", "main"},
         {"hlsl.float1.frag", "PixelShaderFunction"},
         {"hlsl.float4.frag", "PixelShaderFunction"},
         {"hlsl.flatten.return.frag", "main"},

hlsl/hlslParseHelper.cpp

@@ -3660,6 +3660,12 @@ void HlslParseContext::decomposeGeometryMethods(const TSourceLoc& loc, TIntermTy
     switch (op) {
     case EOpMethodAppend:
         if (argAggregate) {
+            // Don't emit these for non-GS stage, since we won't have the gsStreamOutput symbol.
+            if (language != EShLangGeometry) {
+                node = nullptr;
+                return;
+            }
+
             TIntermAggregate* sequence = nullptr;
             TIntermAggregate* emit = new TIntermAggregate(EOpEmitVertex);
 
@@ -3689,6 +3695,12 @@ void HlslParseContext::decomposeGeometryMethods(const TSourceLoc& loc, TIntermTy
 
     case EOpMethodRestartStrip:
         {
+            // Don't emit these for non-GS stage, since we won't have the gsStreamOutput symbol.
+            if (language != EShLangGeometry) {
+                node = nullptr;
+                return;
+            }
+
             TIntermAggregate* cut = new TIntermAggregate(EOpEndPrimitive);
             cut->setLoc(loc);
             cut->setType(TType(EbtVoid));