mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-04-02 10:42:14 -04:00
94b2538af5
byuu says: Basically just a project rename, with s/bsnes/higan and the new icon from lowkee added in. It won't compile on Windows because I forgot to update the resource.rc file, and a path transform command isn't working on Windows. It was really just meant as a starting point, so that v091 WIPs can flow starting from .00 with the new name (it overshadows bsnes v091, so publicly speaking this "shouldn't exist" and will probably be deleted from Google Code when v092 is ready.)
82 lines
2.1 KiB
C++
Executable file
82 lines
2.1 KiB
C++
Executable file
#ifndef NALL_BIT_HPP
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#define NALL_BIT_HPP
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#include <nall/stdint.hpp>
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namespace nall {
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template<unsigned bits>
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inline uintmax_t uclamp(const uintmax_t x) {
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enum : uintmax_t { b = 1ull << (bits - 1), y = b * 2 - 1 };
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return y + ((x - y) & -(x < y)); //min(x, y);
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}
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template<unsigned bits>
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inline uintmax_t uclip(const uintmax_t x) {
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enum : uintmax_t { b = 1ull << (bits - 1), m = b * 2 - 1 };
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return (x & m);
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}
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template<unsigned bits>
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inline intmax_t sclamp(const intmax_t x) {
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enum : intmax_t { b = 1ull << (bits - 1), m = b - 1 };
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return (x > m) ? m : (x < -b) ? -b : x;
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}
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template<unsigned bits>
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inline intmax_t sclip(const intmax_t x) {
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enum : uintmax_t { b = 1ull << (bits - 1), m = b * 2 - 1 };
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return ((x & m) ^ b) - b;
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}
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namespace bit {
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constexpr inline uintmax_t mask(const char *s, uintmax_t sum = 0) {
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return (
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*s == '0' || *s == '1' ? mask(s + 1, (sum << 1) | 1) :
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*s == ' ' || *s == '_' ? mask(s + 1, sum) :
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*s ? mask(s + 1, sum << 1) :
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sum
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);
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}
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constexpr inline uintmax_t test(const char *s, uintmax_t sum = 0) {
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return (
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*s == '0' || *s == '1' ? test(s + 1, (sum << 1) | (*s - '0')) :
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*s == ' ' || *s == '_' ? test(s + 1, sum) :
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*s ? test(s + 1, sum << 1) :
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sum
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);
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}
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//lowest(0b1110) == 0b0010
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constexpr inline uintmax_t lowest(const uintmax_t x) {
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return x & -x;
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}
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//clear_lowest(0b1110) == 0b1100
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constexpr inline uintmax_t clear_lowest(const uintmax_t x) {
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return x & (x - 1);
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}
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//set_lowest(0b0101) == 0b0111
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constexpr inline uintmax_t set_lowest(const uintmax_t x) {
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return x | (x + 1);
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}
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//count number of bits set in a byte
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inline unsigned count(uintmax_t x) {
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unsigned count = 0;
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do count += x & 1; while(x >>= 1);
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return count;
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}
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//round up to next highest single bit:
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//round(15) == 16, round(16) == 16, round(17) == 32
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inline uintmax_t round(uintmax_t x) {
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if((x & (x - 1)) == 0) return x;
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while(x & (x - 1)) x &= x - 1;
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return x << 1;
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}
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}
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}
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#endif
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