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phosit
104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
/* Copyright (C) 2025 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.h"
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#include "lib/status.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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std::uint32_t u64_hi(std::uint64_t x)
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{
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return static_cast<std::uint32_t>(x >> 32);
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}
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std::uint32_t u64_lo(std::uint64_t x)
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{
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return static_cast<std::uint32_t>(x & 0xFFFFFFFF);
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}
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std::uint16_t u32_hi(std::uint32_t x)
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{
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return static_cast<std::uint16_t>(x >> 16);
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}
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std::uint16_t u32_lo(std::uint32_t x)
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{
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return static_cast<std::uint16_t>(x & 0xFFFF);
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}
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std::uint64_t u64_from_u32(std::uint32_t hi, std::uint32_t lo)
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{
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std::uint64_t x = static_cast<std::uint64_t>(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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std::uint32_t u32_from_u16(std::uint16_t hi, std::uint16_t lo)
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{
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std::uint32_t x = static_cast<std::uint32_t>(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 std::uint8_t range
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std::uint8_t 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 static_cast<std::uint8_t>(l);
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}
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// input in [0, 1); convert to std::uint16_t range
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std::uint16_t 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 static_cast<std::uint16_t>(l);
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}
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