From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 5 Jul 2018 21:03:35 +0000 (+0300)
Subject: Support the sample sampling qualifier
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=91d3eac06389c0bb0363f643790581403b5fca1b

Support the sample sampling qualifier

Also add a version check for the centroid qualifier.
---

diff --git a/source/programcompiler.cpp b/source/programcompiler.cpp
index 1ba898ec..1c84a96d 100644
--- a/source/programcompiler.cpp
+++ b/source/programcompiler.cpp
@@ -1765,6 +1765,22 @@ bool ProgramCompiler::LegacyConverter::supports_interface_layouts() const
 		return check_version(Version(3, 30));
 }
 
+bool ProgramCompiler::LegacyConverter::supports_centroid_sampling() const
+{
+	if(target_api==OPENGL_ES2)
+		return check_version(Version(3, 0));
+	else
+		return check_version(Version(1, 20));
+}
+
+bool ProgramCompiler::LegacyConverter::supports_sample_sampling() const
+{
+	if(target_api==OPENGL_ES2)
+		return check_version(Version(3, 20));
+	else
+		return check_version(Version(4, 0));
+}
+
 void ProgramCompiler::LegacyConverter::visit(VariableDeclaration &var)
 {
 	if(var.layout && !supports_interface_layouts())
@@ -1792,6 +1808,17 @@ void ProgramCompiler::LegacyConverter::visit(VariableDeclaration &var)
 		}
 	}
 
+	if(var.sampling=="centroid")
+	{
+		if(!supports_centroid_sampling())
+			var.sampling = string();
+	}
+	else if(var.sampling=="sample")
+	{
+		if(!supports_sample_sampling())
+			var.sampling = string();
+	}
+
 	if((var.interface=="in" || var.interface=="out") && !supports_unified_interface_syntax())
 	{
 		if(stage->type==FRAGMENT && var.interface=="out")
diff --git a/source/programcompiler.h b/source/programcompiler.h
index 7e8d3373..56bf1d53 100644
--- a/source/programcompiler.h
+++ b/source/programcompiler.h
@@ -361,6 +361,8 @@ private:
 		bool supports_unified_sampling_functions() const;
 		virtual void visit(ProgramSyntax::FunctionCall &);
 		bool supports_interface_layouts() const;
+		bool supports_centroid_sampling() const;
+		bool supports_sample_sampling() const;
 		virtual void visit(ProgramSyntax::VariableDeclaration &);
 		bool supports_interface_blocks(const std::string &) const;
 		virtual void visit(ProgramSyntax::InterfaceBlock &);
diff --git a/source/programparser.cpp b/source/programparser.cpp
index b3a226fc..159c3147 100644
--- a/source/programparser.cpp
+++ b/source/programparser.cpp
@@ -315,7 +315,7 @@ bool ProgramParser::is_interface_qualifier(const string &token)
 
 bool ProgramParser::is_sampling_qualifier(const string &token)
 {
-	return token=="centroid";
+	return (token=="centroid" || token=="sample");
 }
 
 bool ProgramParser::is_interpolation_qualifier(const string &token)