Varying interpolation qualifier check

src/OpenGL/compiler/OutputASM.cpp

@@ -2921,7 +2921,7 @@ namespace glsl
 				}
 			}
 
-			activeVaryings.push_back(glsl::Varying(glVariableType(type), name, type.getArraySize(), registerIndex, 0));
+			activeVaryings.push_back(glsl::Varying(glVariableType(type), name, type.getArraySize(), type.getQualifier(), registerIndex, 0));
 		}
 	}
 

src/OpenGL/compiler/OutputASM.h

@@ -152,8 +152,8 @@ namespace glsl
 
 	struct Varying
 	{
-		Varying(GLenum type, const std::string &name, int arraySize, int reg = -1, int col = -1)
-			: type(type), name(name), arraySize(arraySize), reg(reg), col(col)
+		Varying(GLenum type, const std::string &name, int arraySize, TQualifier qualifier, int reg = -1, int col = -1)
+			: type(type), name(name), arraySize(arraySize), qualifier(qualifier), reg(reg), col(col)
 		{
 		}
 
@@ -170,6 +170,7 @@ namespace glsl
 		GLenum type;
 		std::string name;
 		int arraySize;
+		TQualifier qualifier;
 
 		int reg;    // First varying register, assigned during link
 		int col;    // First register element, assigned during link

src/OpenGL/libGLESv2/Program.cpp

@@ -1330,6 +1330,13 @@ namespace es2
 						return false;
 					}
 
+					if((output.qualifier == EvqFlatOut) ^ (input.qualifier == EvqFlatIn))
+					{
+						appendToInfoLog("Interpolation qualifiers for %s differ between vertex and fragment shaders", output.name.c_str());
+
+						return false;
+					}
+
 					matched = true;
 					break;
 				}