Support stage_switch. (#6311)

* Support stage_switch.

* Update proposal status.

* Fix gl_InstanceID.

* Fix.

1 files changed, 15 insertions, 2 deletions

diff --git a/source/slang/slang-parser.cpp b/source/slang/slang-parser.cpp
index 95eb971ee..38285c41f 100644
--- a/source/slang/slang-parser.cpp
+++ b/source/slang/slang-parser.cpp
@@ -5380,9 +5380,8 @@ static Stmt* ParseDefaultStmt(Parser* parser)
     return stmt;
 }
 
-static Stmt* parseTargetSwitchStmt(Parser* parser)
+static Stmt* parseTargetSwitchStmtImpl(Parser* parser, TargetSwitchStmt* stmt)
 {
-    TargetSwitchStmt* stmt = parser->astBuilder->create<TargetSwitchStmt>();
     parser->FillPosition(stmt);
     parser->ReadToken();
     if (!beginMatch(parser, MatchedTokenType::CurlyBraces))
@@ -5479,6 +5478,18 @@ static Stmt* parseTargetSwitchStmt(Parser* parser)
     return stmt;
 }
 
+static Stmt* parseTargetSwitchStmt(Parser* parser)
+{
+    auto stmt = parser->astBuilder->create<TargetSwitchStmt>();
+    return parseTargetSwitchStmtImpl(parser, stmt);
+}
+
+static Stmt* parseStageSwitchStmt(Parser* parser)
+{
+    auto stmt = parser->astBuilder->create<StageSwitchStmt>();
+    return parseTargetSwitchStmtImpl(parser, stmt);
+}
+
 static Stmt* parseIntrinsicAsmStmt(Parser* parser)
 {
     IntrinsicAsmStmt* stmt = parser->astBuilder->create<IntrinsicAsmStmt>();
@@ -5725,6 +5736,8 @@ Stmt* Parser::ParseStatement(Stmt* parentStmt)
         statement = ParseSwitchStmt(this);
     else if (LookAheadToken("__target_switch"))
         statement = parseTargetSwitchStmt(this);
+    else if (LookAheadToken("__stage_switch"))
+        statement = parseStageSwitchStmt(this);
     else if (LookAheadToken("__intrinsic_asm"))
         statement = parseIntrinsicAsmStmt(this);
     else if (LookAheadToken("case"))