HLSL: Implement support for RT/Viewport output from VS

In DX10/DX11 you can only output RT/Viewport indices from GS; however, DX11.4/DX12 add support for outputting these from VS as well. This is supported by Vulkan if the relevant extension is available, and by MSL and by MSL (which you can cross-compile to via SPIRV-Cross).

HLSL: Implement support for RT/Viewport output from VS
c92860e2 · Arseny Kapoulkine · e078059d · c92860e2
Commit c92860e2 authored Dec 13, 2017 by Arseny Kapoulkine
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hlslParseHelper.cpp hlsl/hlslParseHelper.cpp +1 -1

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--- a/hlsl/hlslParseHelper.cpp
+++ b/hlsl/hlslParseHelper.cpp
@@ -9115,7 +9115,7 @@ bool HlslParseContext::isOutputBuiltIn(const TQualifier& qualifier) const
        return language == EShLangFragment;
    case EbvLayer:
    case EbvViewportIndex:
-        return language == EShLangGeometry;
+        return language == EShLangGeometry || language == EShLangVertex;
    case EbvPrimitiveId:
        return language == EShLangGeometry;
    case EbvTessLevelInner: