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/* Copyright (C) 2010 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* various utility functions.
*/
#include "precompiled.h"
#include "lib/lib.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "lib/app_hooks.h"
#include "lib/sysdep/sysdep.h"
//-----------------------------------------------------------------------------
// type conversion
// these avoid a common mistake in using >> (ANSI requires shift count be
// less than the bit width of the type).
u32 u64_hi(u64 x)
{
return (u32)(x >> 32);
}
u32 u64_lo(u64 x)
{
return (u32)(x & 0xFFFFFFFF);
}
u16 u32_hi(u32 x)
{
return (u16)(x >> 16);
}
u16 u32_lo(u32 x)
{
return (u16)(x & 0xFFFF);
}
u64 u64_from_u32(u32 hi, u32 lo)
{
u64 x = (u64)hi;
x <<= 32;
x |= lo;
return x;
}
u32 u32_from_u16(u16 hi, u16 lo)
{
u32 x = (u32)hi;
x <<= 16;
x |= lo;
return x;
}
// input in [0, 1); convert to u8 range
u8 u8_from_double(double in)
{
if(!(0.0 <= in && in < 1.0))
{
DEBUG_WARN_ERR(ERR::LOGIC); // clampf not in [0,1)
return 255;
}
int l = (int)(in * 255.0);
ENSURE((unsigned)l <= 255u);
return (u8)l;
}
// input in [0, 1); convert to u16 range
u16 u16_from_double(double in)
{
if(!(0.0 <= in && in < 1.0))
{
DEBUG_WARN_ERR(ERR::LOGIC); // clampf not in [0,1)
return 65535;
}
long l = (long)(in * 65535.0);
ENSURE((unsigned long)l <= 65535u);
return (u16)l;
}
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