From 11520b2b95f4242b3ca4d2d3d14a0f2b5c1623f1 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 4 Jul 2018 02:26:02 +0300
Subject: [PATCH] Add support for GLSL interpolation qualifiers

---
 source/programcompiler.cpp |  2 ++
 source/programparser.cpp   | 13 ++++++++++++-
 source/programparser.h     |  1 +
 source/programsyntax.h     |  1 +
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/source/programcompiler.cpp b/source/programcompiler.cpp
index 5bb84269..1ba898ec 100644
--- a/source/programcompiler.cpp
+++ b/source/programcompiler.cpp
@@ -460,6 +460,8 @@ void ProgramCompiler::Formatter::visit(VariableDeclaration &var)
 	}
 	if(var.constant)
 		formatted += "const ";
+	if(!var.interpolation.empty())
+		formatted += format("%s ", var.interpolation);
 	if(!var.sampling.empty())
 		formatted += format("%s ", var.sampling);
 	if(!var.interface.empty() && var.interface!=block_interface)
diff --git a/source/programparser.cpp b/source/programparser.cpp
index 80917ba3..b3a226fc 100644
--- a/source/programparser.cpp
+++ b/source/programparser.cpp
@@ -318,6 +318,11 @@ bool ProgramParser::is_sampling_qualifier(const string &token)
 	return token=="centroid";
 }
 
+bool ProgramParser::is_interpolation_qualifier(const string &token)
+{
+	return (token=="smooth" || token=="flat" || token=="noperspective");
+}
+
 bool ProgramParser::is_precision_qualifier(const string &token)
 {
 	return (token=="highp" || token=="mediump" || token=="lowp");
@@ -325,7 +330,11 @@ bool ProgramParser::is_precision_qualifier(const string &token)
 
 bool ProgramParser::is_qualifier(const string &token)
 {
-	return (token=="const" || is_interface_qualifier(token) || is_sampling_qualifier(token) || is_precision_qualifier(token));
+	return (token=="const" ||
+		is_interface_qualifier(token) ||
+		is_sampling_qualifier(token) ||
+		is_interpolation_qualifier(token) ||
+		is_precision_qualifier(token));
 }
 
 bool ProgramParser::is_builtin_type(const string &token)
@@ -725,6 +734,8 @@ RefPtr<VariableDeclaration> ProgramParser::parse_variable_declaration()
 			var->interface = token;
 		else if(is_sampling_qualifier(token))
 			var->sampling = token;
+		else if(is_interpolation_qualifier(token))
+			var->interpolation = token;
 		else if(is_precision_qualifier(token))
 			var->precision = token;
 		else if(token=="const")
diff --git a/source/programparser.h b/source/programparser.h
index fa37118d..903e5834 100644
--- a/source/programparser.h
+++ b/source/programparser.h
@@ -78,6 +78,7 @@ private:
 
 	static bool is_interface_qualifier(const std::string &);
 	static bool is_sampling_qualifier(const std::string &);
+	static bool is_interpolation_qualifier(const std::string &);
 	static bool is_precision_qualifier(const std::string &);
 	static bool is_qualifier(const std::string &);
 	static bool is_builtin_type(const std::string &);
diff --git a/source/programsyntax.h b/source/programsyntax.h
index b0ad02b3..5e107a33 100644
--- a/source/programsyntax.h
+++ b/source/programsyntax.h
@@ -226,6 +226,7 @@ struct VariableDeclaration: Node
 {
 	bool constant;
 	std::string sampling;
+	std::string interpolation;
 	std::string interface;
 	std::string precision;
 	std::string type;
-- 
2.43.0