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#pragma once |
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#include "base/ints.h" |
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namespace eu |
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{ |
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namespace kk |
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{ |
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constexpr float epsilon = 0.0001f; |
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} |
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constexpr float pi = 3.1415926535897932384626433832795f; |
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// constexpr float half_pi = pi / 2.0f; |
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constexpr float cabs(float r) |
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{ |
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return r >= 0.0f |
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? r |
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: -r |
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; |
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} |
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/** \addtogroup math |
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* @{ |
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*/ |
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constexpr bool is_zero(float r, float epsilon = kk::epsilon) |
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{ |
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return cabs(r) < epsilon; |
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} |
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constexpr bool |
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is_equal(float lhs, float rhs, float epsilon = kk::epsilon) |
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{ |
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return is_zero(lhs - rhs, epsilon); |
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} |
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int |
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floor_to_int(float v); |
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int |
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ceil_to_int(float v); |
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/** Calculates the sign as a positive or a negative int. |
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@returns 1 if r is greater than 0, -1 if not. |
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*/ |
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constexpr int |
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get_sign(float r) |
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{ |
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if(r >= 0.0f) { return 1; } |
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else { return -1; } |
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} |
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/// Returns `1` if `true` or -1 |
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constexpr float |
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get_sign(bool b) |
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{ |
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if(b) { return 1.0f; } |
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else { return -1.0f; } |
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} |
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constexpr float |
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lerp_float(float f, float scale, float t) |
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{ |
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return f + (t - f) * scale; |
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} |
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/// Return `r * r` |
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constexpr float |
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square(float r) |
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{ |
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return r * r; |
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} |
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constexpr float min(float lhs, float rhs) { return lhs < rhs ? lhs : rhs; } |
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constexpr float max(float lhs, float rhs) { return lhs > rhs ? lhs : rhs; } |
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/// If the `value` is close to zero, `def` is returned |
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constexpr float |
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clamp_zero(float value, float def = 0.0f, float epsilon = kk::epsilon) |
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{ |
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if(is_zero(value, epsilon)) { return def; } |
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else { return value; } |
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} |
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/** @}*/ |
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} |
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