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Updated ceilPowerOfTwo for signed int support

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This commit is contained in:
Christophe Riccio
2014-10-27 23:02:47 +01:00
parent 3420d691f5
commit a88d8935be
3 changed files with 51 additions and 2 deletions
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21
glm/gtc/integer.inl
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@@ -48,7 +48,26 @@ namespace detail
};
template <typename T, precision P, template <typename, precision> class vecType, bool isSigned = true>
struct compute_ceilPowerOfTwo{};
struct compute_ceilPowerOfTwo
{
GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & x)
{
GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");
vecType<T, P> const Sign(sign(x));
vecType<T, P> v(abs(x));
v = v - static_cast<T>(1);
v = v | (v >> static_cast<T>(1));
v = v | (v >> static_cast<T>(2));
v = v | (v >> static_cast<T>(4));
v = compute_ceilShift<T, P, vecType, sizeof(T) >= 2>::call(v, 8);
v = compute_ceilShift<T, P, vecType, sizeof(T) >= 4>::call(v, 16);
v = compute_ceilShift<T, P, vecType, sizeof(T) >= 8>::call(v, 32);
return (v + static_cast<T>(1)) * Sign;
}
};
template <typename T, precision P, template <typename, precision> class vecType>
struct compute_ceilPowerOfTwo<T, P, vecType, false>