forked from 0ad/0ad
elexis
43137fef3f
Differential Revision: https://code.wildfiregames.com/D716
Refs 09e974e1cb
Reviewed By: bb
Change in agreement with leper.
This was SVN commit r19899.
109 lines
2.4 KiB
C++
109 lines
2.4 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* various utility functions.
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*/
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#include "precompiled.h"
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#include "lib/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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//-----------------------------------------------------------------------------
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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_ERR(ERR::LOGIC); // 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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ENSURE((unsigned)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_ERR(ERR::LOGIC); // 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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ENSURE((unsigned long)l <= 65535u);
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return (u16)l;
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}
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