From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 12 Nov 2016 18:09:16 +0000 (+0200)
Subject: Generate a passthrough for gl_Position in geometry shader
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=a209ca32465c61b38f3a57ee6577568f3994e8ab;p=libs%2Fgl.git

Generate a passthrough for gl_Position in geometry shader
---

diff --git a/source/programcompiler.cpp b/source/programcompiler.cpp
index 541fd8e2..2bb26946 100644
--- a/source/programcompiler.cpp
+++ b/source/programcompiler.cpp
@@ -656,6 +656,24 @@ void ProgramCompiler::InterfaceGenerator::visit(Passthrough &pass)
 		}
 	}
 
+	if(stage->type==GEOMETRY)
+	{
+		VariableReference *ref = new VariableReference;
+		ref->name = "gl_in";
+
+		BinaryExpression *subscript = new BinaryExpression;
+		subscript->left = ref;
+		subscript->oper = "[";
+		subscript->right = pass.subscript;
+		subscript->after = "]";
+
+		MemberAccess *memacc = new MemberAccess;
+		memacc->left = subscript;
+		memacc->member = "gl_Position";
+
+		insert_assignment("gl_Position", memacc);
+	}
+
 	for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
 	{
 		string out_name = change_prefix((*i)->name, out_prefix);