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Added GTX_ulp implementation of scalar functions (TODO: vector ones)
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@ -7,13 +7,105 @@
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// File : glm/gtx/ulp.inl
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#include <cmath>
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#include <iostream>
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#if(GLM_COMPILER & GLM_COMPILER_VC)
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# include <cfloat>
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# define GLM_NEXT_AFTER _nextafterf
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#else
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# include <cmath>
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# define GLM_NEXT_AFTER nextafterf
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#endif
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namespace glm{
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namespace gtx{
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namespace ulp
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{
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GLM_FUNC_QUALIFIER float next_float(float const & x)
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{
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return GLM_NEXT_AFTER(x, std::numeric_limits<float>::max());
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}
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GLM_FUNC_QUALIFIER double next_float(double const & x)
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{
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return GLM_NEXT_AFTER(x, std::numeric_limits<double>::max());
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}
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template<typename T, template<typename> class vecType>
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GLM_FUNC_QUALIFIER vecType<T> next_float(vecType<T> const & x)
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{
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vecType<T> Result;
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for(std::size_t i = 0; i < Result.length(); ++i)
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Result[i] = next_float(x[i]);
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return Result;
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}
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GLM_FUNC_QUALIFIER float prev_float(float const & x)
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{
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return GLM_NEXT_AFTER(x, std::numeric_limits<float>::min());
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}
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GLM_FUNC_QUALIFIER double prev_float(double const & x)
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{
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return GLM_NEXT_AFTER(x, std::numeric_limits<double>::min());
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}
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template<typename T, template<typename> class vecType>
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GLM_FUNC_QUALIFIER vecType<T> prev_float(vecType<T> const & x)
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{
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vecType<T> Result;
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for(std::size_t i = 0; i < Result.length(); ++i)
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Result[i] = prev_float(x[i]);
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return Result;
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}
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template <typename T>
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GLM_FUNC_QUALIFIER T next_float(T const & x, std::size_t const & ulps)
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{
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T temp = x;
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for(std::size_t i = 0; i < ulps; ++i)
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temp = next_float(temp);
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return temp;
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}
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template <typename T>
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GLM_FUNC_QUALIFIER T prev_float(T const & x, std::size_t const & ulps)
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{
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T temp = x;
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for(std::size_t i = 0; i < ulps; ++i)
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temp = prev_float(temp);
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return temp;
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}
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template <typename T>
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GLM_FUNC_QUALIFIER std::size_t float_distance(T const & x, T const & y)
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{
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std::size_t ulp = 0;
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if(x < y)
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{
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T temp = x;
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while(temp != y && ulp < std::numeric_limits<std::size_t>::max())
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{
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++ulp;
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temp = next_float(temp);
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}
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}
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else if(y < x)
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{
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T temp = y;
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while(temp != x && ulp < std::numeric_limits<std::size_t>::max())
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{
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++ulp;
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temp = next_float(temp);
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}
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}
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else // ==
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{
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}
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return ulp;
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}
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inline std::size_t ulp
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(
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detail::thalf const & a,
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