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Make floor2 and ceil2 constexpr functions

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Tulio Leao
2019-11-30 08:41:45 -03:00
parent 58948793e9
commit 1e67c3bff8
1 changed files with 15 additions and 2 deletions
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17
src/openrct2/common.h
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@@ -50,11 +50,24 @@ const constexpr auto ror32 = ror<uint32_t>;
const constexpr auto rol64 = rol<uint64_t>;
const constexpr auto ror64 = ror<uint64_t>;
constexpr bool is_power_of_2(int v)
{
return v && ((v & (v - 1)) == 0);
}
// Rounds an integer down to the given power of 2. y must be a power of 2.
#define floor2(x, y) ((x) & (~((y)-1)))
constexpr int floor2(const int x, const int y)
{
assert(is_power_of_2(y));
return ((x) & (~((y)-1)));
}
// Rounds an integer up to the given power of 2. y must be a power of 2.
#define ceil2(x, y) (((x) + (y)-1) & (~((y)-1)))
constexpr int ceil2(const int x, const int y)
{
assert(is_power_of_2(y));
return (((x) + (y)-1) & (~((y)-1)));
}
// Gets the name of a symbol as a C string
#define nameof(symbol) #symbol