constants.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_IMPELLER_GEOMETRY_CONSTANTS_H_
#define FLUTTER_IMPELLER_GEOMETRY_CONSTANTS_H_
 
namespace impeller {
 
// e
constexpr float kE = 2.7182818284590452354f;
 
// log_2 e
constexpr float kLog2E = 1.4426950408889634074f;
 
// log_10 e
constexpr float kLog10E = 0.43429448190325182765f;
 
// log_e 2
constexpr float kLogE2 = 0.69314718055994530942f;
 
// log_e 10
constexpr float kLogE10 = 2.30258509299404568402f;
 
// pi
constexpr float kPi = 3.14159265358979323846f;
 
// pi*2
constexpr float k2Pi = 6.28318530717958647693f;
 
// pi/2
constexpr float kPiOver2 = 1.57079632679489661923f;
 
// pi/4
constexpr float kPiOver4 = 0.78539816339744830962f;
 
// 1/pi
constexpr float k1OverPi = 0.31830988618379067154f;
 
// 2/pi
constexpr float k2OverPi = 0.63661977236758134308f;
 
// 2/sqrt(pi)
constexpr float k2OverSqrtPi = 1.12837916709551257390f;
 
// sqrt(2)
constexpr float kSqrt2 = 1.41421356237309504880f;
 
// sqrt(2) / 2 == 1/sqrt(2)
constexpr float k1OverSqrt2 = 0.70710678118654752440f;
constexpr float kSqrt2Over2 = 0.70710678118654752440f;
 
// phi
constexpr float kPhi = 1.61803398874989484820f;
 
// 0.001
constexpr float kEhCloseEnough = 1e-3f;
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_GEOMETRY_CONSTANTS_H_