Add jngl::round because std::lround returns long and there's no std::…

…iround in C++ ffs

src/jngl/other.hpp

@@ -124,4 +124,7 @@ std::string getPreferredLanguage();
 /// Opens a link (e.g. https://bixense.com) in the browser
 void openURL(const std::string&);
 
+/// Rounds a double to an integer, just like std::lround
+int round(double v);
+
 } // namespace jngl

src/main.cpp

@@ -806,4 +806,9 @@ ShaderProgram::Context useSimpleShaderProgram(const Mat3& modelview) {
 	return context;
 }
 
+int round(double v) {
+	assert(!std::isnan(v));
+	return static_cast<int>(std::lround(v));
+}
+
 } // namespace jngl