Fix nv_viewport_mask semantic to emit SpvBuiltInViewportMaskNV (#7904)

Fixes #7903

SPV_NV_viewport_array2 says ViewportMaskNV corresponds to gl_ViewportMask

1 files changed, 3 insertions, 6 deletions

diff --git a/source/slang/slang-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index 7f56daf09..b1b4c4570 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -6209,12 +6209,9 @@ struct SPIRVEmitContext : public SourceEmitterBase, public SPIRVEmitSharedContex
                 }
                 else if (semanticName == "nv_viewport_mask")
                 {
-                    requireSPIRVCapability(SpvCapabilityPerViewAttributesNV);
-                    ensureExtensionDeclaration(UnownedStringSlice("SPV_NV_mesh_shader"));
-                    return getBuiltinGlobalVar(
-                        inst->getFullType(),
-                        SpvBuiltInViewportMaskPerViewNV,
-                        inst);
+                    requireSPIRVCapability(SpvCapabilityShaderViewportMaskNV);
+                    ensureExtensionDeclaration(UnownedStringSlice("SPV_NV_viewport_array2"));
+                    return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInViewportMaskNV, inst);
                 }
                 else if (semanticName == "sv_barycentrics")
                 {