Add atan2 to FixedPoint

Author: askastitva

libopenage/util/fixed_point.h

@@ -370,6 +370,10 @@ class FixedPoint {
 	constexpr double sqrt() {
 		return std::sqrt(this->to_double());
 	}
+
+	constexpr double atan2(const FixedPoint &n) {
+		return std::atan2(this->to_double(), n->to_double());
+	}
 };
 
 
@@ -481,6 +485,11 @@ constexpr double sqrt(openage::util::FixedPoint<I, F> n) {
 	return n.sqrt();
 }
 
+template <typename I, unsigned F>
+constexpr double atan2(openage::util::FixedPoint<I, F> x, openage::util::FixedPoint<I, F> y) {
+	return x.atan2(y);
+}
+
 template <typename I, unsigned F>
 constexpr openage::util::FixedPoint<I, F> min(openage::util::FixedPoint<I, F> x, openage::util::FixedPoint<I, F> y) {
 	return openage::util::FixedPoint<I, F>::from_raw_value(

libopenage/util/fixed_point_test.cpp

@@ -58,6 +58,7 @@ void fixed_point() {
 	TESTEQUALS_FLOAT((e * 10).to_double(), 108.3 * 10, 1e-7);
 	TESTEQUALS_FLOAT((e / 10).to_double(), 108.3 / 10, 1e-7);
 	TESTEQUALS_FLOAT(std::sqrt(e), sqrt(108.3), 1e-7);
+	TESTEQUALS_FLOAT(std::atan2(e, f), atan2(108.3, -12.4), 1e-7);
 	TESTEQUALS_FLOAT(std::abs(-e).to_double(), 108.3, 1e-7);
 	TESTEQUALS_FLOAT(std::hypot(e, f), hypot(108.3, -12.4), 1e-7);
 	TESTEQUALS_FLOAT(std::min(e, f), -12.4, 1e-7);