forked from 0ad/0ad
janwas
452d67f0b7
lib: move IsSimilarMagnitude and downcasters here from single modules where they're used acpi: simplify by only using v1.0 or 2.0 tables snd: add note on why OpenAL can't be used mahaf: change prefix wcpu: cache results, reinstate wcpu_ClockFrequency win: add winreg.h for registry functions wsnd: only do the DSound thing on non-vista (and delay-load to avoid overhead) wutil: add code to correctly detect windows version This was SVN commit r5090.
106 lines
1.7 KiB
C++
106 lines
1.7 KiB
C++
/**
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* =========================================================================
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* File : lib.cpp
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* Project : 0 A.D.
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* Description : various utility functions.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "lib.h"
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "lib/app_hooks.h"
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#include "lib/sysdep/sysdep.h"
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u16 addusw(u16 x, u16 y)
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{
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u32 t = x;
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return (u16)std::min(t+y, 0xFFFFu);
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}
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u16 subusw(u16 x, u16 y)
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{
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long t = x;
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return (u16)(std::max(t-y, 0l));
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}
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//-----------------------------------------------------------------------------
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// type conversion
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// these avoid a common mistake in using >> (ANSI requires shift count be
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// less than the bit width of the type).
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u32 u64_hi(u64 x)
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{
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return (u32)(x >> 32);
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}
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u32 u64_lo(u64 x)
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{
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return (u32)(x & 0xFFFFFFFF);
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}
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u16 u32_hi(u32 x)
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{
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return (u16)(x >> 16);
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}
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u16 u32_lo(u32 x)
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{
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return (u16)(x & 0xFFFF);
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}
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u64 u64_from_u32(u32 hi, u32 lo)
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{
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u64 x = (u64)hi;
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x <<= 32;
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x |= lo;
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return x;
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}
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u32 u32_from_u16(u16 hi, u16 lo)
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{
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u32 x = (u32)hi;
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x <<= 16;
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x |= lo;
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return x;
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}
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// input in [0, 1); convert to u8 range
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u8 u8_from_double(double in)
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{
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if(!(0.0 <= in && in < 1.0))
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{
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debug_warn("clampf not in [0,1)");
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return 255;
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}
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int l = (int)(in * 255.0);
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debug_assert((unsigned int)l <= 255u);
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return (u8)l;
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}
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// input in [0, 1); convert to u16 range
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u16 u16_from_double(double in)
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{
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if(!(0.0 <= in && in < 1.0))
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{
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debug_warn("clampf not in [0,1)");
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return 65535;
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}
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long l = (long)(in * 65535.0);
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debug_assert((unsigned long)l <= 65535u);
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return (u16)l;
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}
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