137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2010-2014 Danny Robson <danny@nerdcruft.net>
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*/
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#include "maths.hpp"
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#include "debug.hpp"
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#include "float.hpp"
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#include <cmath>
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#include <type_traits>
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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T
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util::log2up (T v)
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{
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return log2 ((v << 1) - 1);
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}
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template uint32_t util::log2up (uint32_t);
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template uint64_t util::log2up (uint64_t);
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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T
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util::log2 (T v)
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{
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static_assert (std::is_integral<T>::value,
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"log2 is only implemented for integers");
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T l = 0;
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while (v >>= 1)
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++l;
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return l;
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}
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template uint8_t util::log2 (uint8_t);
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template uint16_t util::log2 (uint16_t);
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template uint32_t util::log2 (uint32_t);
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template uint64_t util::log2 (uint64_t);
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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bool
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util::is_integer (const T &value)
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{
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T integer;
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return exactly_equal (std::modf (value, &integer),
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static_cast<T> (0.0));
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}
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//-----------------------------------------------------------------------------
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template bool util::is_integer (const double&);
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template bool util::is_integer (const float&);
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///////////////////////////////////////////////////////////////////////////////
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namespace util {
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template <>
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unsigned
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digits (const uint32_t &v)
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{
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return (v >= 1000000000) ? 10 :
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(v >= 100000000) ? 9 :
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(v >= 10000000) ? 8 :
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(v >= 1000000) ? 7 :
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(v >= 100000) ? 6 :
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(v >= 10000) ? 5 :
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(v >= 1000) ? 4 :
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(v >= 100) ? 3 :
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(v >= 10) ? 2 :
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1;
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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std::enable_if_t<
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std::is_integral<T>::value, T
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>
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util::round_pow2 (T value)
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{
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using return_type = std::enable_if_t<std::is_integral<T>::value, T>;
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--value;
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for (unsigned i = 1; i < sizeof (T) * 8; i <<= 1) {
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value |= value >> i;
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}
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++value;
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return (return_type)value;
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}
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//-----------------------------------------------------------------------------
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template uint8_t util::round_pow2 (uint8_t);
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template uint16_t util::round_pow2 (uint16_t);
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template uint32_t util::round_pow2 (uint32_t);
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template uint64_t util::round_pow2 (uint64_t);
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///////////////////////////////////////////////////////////////////////////////
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template const float util::PI<float>;
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template const double util::PI<double>;
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///////////////////////////////////////////////////////////////////////////////
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// Simple instantiations. Some functions aren't used internally to the library
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// so it's easier to instantiate early and check for broken code at library
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// build time.
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template float util::limit (float, float, float);
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template float util::smoothstep (float, float, float);
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template double util::smoothstep (double, double, double);
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