| // 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. |
| |
| #pragma once |
| |
| namespace impeller { |
| |
| // e |
| constexpr float kE = 2.7182818284590452354f; |
| |
| // log_2 e |
| constexpr float kLog2_E = 1.4426950408889634074f; |
| |
| // log_10 e |
| constexpr float kLog10_E = 0.43429448190325182765f; |
| |
| // log_e 2 |
| constexpr float klogE_2 = 0.69314718055994530942f; |
| |
| // log_e 10 |
| constexpr float klogE_10 = 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; |
| |
| // 1/sqrt(2) |
| constexpr float k1OverSqrt2 = 0.70710678118654752440f; |
| |
| // phi |
| constexpr float kPhi = 1.61803398874989484820f; |
| |
| // 0.001 |
| constexpr float kEhCloseEnough = 1e-3f; |
| |
| } // namespace impeller |
