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Added iround and uround to GTC_integer, fast round on positive values

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This commit is contained in:
Christophe Riccio
2016-03-10 21:53:08 +01:00
parent 52d05aee76
commit 86c58b8b8b
4 changed files with 51 additions and 2 deletions
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13
glm/gtc/integer.hpp
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@@ -99,6 +99,19 @@ namespace glm
template <typename T, precision P, template <typename, precision> class vecType>
GLM_FUNC_DECL vecType<T, P> mod(vecType<T, P> const & x, vecType<T, P> const & y);
/// Returns a value equal to the nearest integer to x.
/// The fraction 0.5 will round in a direction chosen by the
/// implementation, presumably the direction that is fastest.
///
/// @param x The values of the argument must be greater or equal to zero.
/// @tparam T floating point scalar types.
/// @tparam vecType vector types.
///
/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/round.xml">GLSL round man page</a>
/// @see gtc_integer
template <typename T, precision P, template <typename, precision> class vecType>
GLM_FUNC_DECL vecType<int, P> iround(vecType<T, P> const & x);
/// Returns a value equal to the nearest integer to x.
/// The fraction 0.5 will round in a direction chosen by the
/// implementation, presumably the direction that is fastest.

19
glm/gtc/integer.inl
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@@ -62,11 +62,28 @@ namespace detail
};
# endif//GLM_HAS_BITSCAN_WINDOWS
}//namespace detail
template <typename genType>
GLM_FUNC_QUALIFIER int iround(genType x)
{
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'iround' only accept floating-point inputs");
assert(static_cast<genType>(0.0) <= x);
return static_cast<int>(x + static_cast<genType>(0.5));
}
template <typename T, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<int, P> iround(vecType<T, P> const& x)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'iround' only accept floating-point inputs");
assert(all(lessThanEqual(vecType<T, P>(0), x)));
return vecType<int, P>(x + static_cast<T>(0.5));
}
template <typename genType>
GLM_FUNC_QUALIFIER uint uround(genType x)
{
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'round' only accept floating-point inputs");
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'uround' only accept floating-point inputs");
assert(static_cast<genType>(0.0) <= x);
return static_cast<uint>(x + static_cast<genType>(0.5));