Support the GLSL/SPIR-V Built-in variable `DeviceIndex` (#7552)

* Support DeviceIndex

* format code

* regenerate command line reference

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/source/slang/slang-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index 82fb39d7d..0a3eb2bf1 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -6023,6 +6023,12 @@ struct SPIRVEmitContext : public SourceEmitterBase, public SPIRVEmitSharedContex
                     requireSPIRVCapability(SpvCapabilityDrawParameters);
                     return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInDrawIndex, inst);
                 }
+                else if (semanticName == "sv_deviceindex")
+                {
+                    ensureExtensionDeclaration(UnownedStringSlice("SPV_KHR_device_group"));
+                    requireSPIRVCapability(SpvCapabilityDeviceGroup);
+                    return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInDeviceIndex, inst);
+                }
                 else if (semanticName == "sv_primitiveid")
                 {
                     auto entryPoints = m_referencingEntryPoints.tryGetValue(inst);