X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fprogramparser.cpp;fp=source%2Fprogramparser.cpp;h=453eb18d31db554f0dd1fc47241a5c770db858dd;hp=bf5d5dffb103fea9b554afa0940f607d12b21ac4;hb=a5772e203cc30ce3b449614d03a293fd5b5985ad;hpb=0ebc82fb851d01a6d7f1fc74a4be6612bc575bb4

diff --git a/source/programparser.cpp b/source/programparser.cpp
index bf5d5dff..453eb18d 100644
--- a/source/programparser.cpp
+++ b/source/programparser.cpp
@@ -307,9 +307,14 @@ bool ProgramParser::is_sampling_qualifier(const string &token)
 	return token=="centroid";
 }
 
+bool ProgramParser::is_precision_qualifier(const string &token)
+{
+	return (token=="highp" || token=="mediump" || token=="lowp");
+}
+
 bool ProgramParser::is_qualifier(const string &token)
 {
-	return (token=="const" || is_interface_qualifier(token) || is_sampling_qualifier(token));
+	return (token=="const" || is_interface_qualifier(token) || is_sampling_qualifier(token) || is_precision_qualifier(token));
 }
 
 bool ProgramParser::is_builtin_type(const string &token)
@@ -334,6 +339,8 @@ RefPtr<Node> ProgramParser::parse_global_declaration()
 	string token = peek_token();
 	if(token=="import")
 		return parse_import();
+	else if(token=="precision")
+		return parse_precision();
 	else if(token=="layout")
 	{
 		RefPtr<Layout> layout = parse_layout();
@@ -355,15 +362,16 @@ RefPtr<Node> ProgramParser::parse_global_declaration()
 	}
 	else if(token=="struct")
 		return parse_struct_declaration();
-	else if(is_sampling_qualifier(token) || token=="const")
-		return parse_variable_declaration();
 	else if(is_interface_qualifier(token))
 	{
-		if(is_type(peek_token(1)))
+		string next = peek_token(1);
+		if(is_type(next) || is_precision_qualifier(next))
 			return parse_variable_declaration();
 		else
 			return parse_interface_block();
 	}
+	else if(is_qualifier(token))
+		return parse_variable_declaration();
 	else if(is_type(token))
 	{
 		if(peek_token(2)=="(")
@@ -422,6 +430,25 @@ RefPtr<Import> ProgramParser::parse_import()
 	return import;
 }
 
+RefPtr<Precision> ProgramParser::parse_precision()
+{
+	expect("precision");
+	RefPtr<Precision> precision = new Precision;
+
+	precision->precision = parse_token();
+	if(!is_precision_qualifier(precision->precision))
+		throw runtime_error(format("Parse error at '%s': expected a precision qualifier", precision->precision));
+
+	precision->type = parse_token();
+	// Not entirely accurate; only float, int and sampler types are allowed
+	if(!is_builtin_type(precision->type))
+		throw runtime_error(format("Parse error at '%s': expected a builtin type", precision->type));
+
+	expect(";");
+
+	return precision;
+}
+
 RefPtr<Layout> ProgramParser::parse_layout()
 {
 	expect("layout");
@@ -623,6 +650,9 @@ RefPtr<VariableDeclaration> ProgramParser::parse_variable_declaration()
 		parse_token();
 	}
 
+	if(is_precision_qualifier(token))
+		var->precision = parse_token();
+
 	var->type = expect_type();
 	var->name = expect_identifier();