mirror of https://github.com/xemu-project/xemu.git
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* Helper FP conversions
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*
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* Copyright (c) 2020-2021 Matt Borgerson
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef FLOATCONV_H
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#define FLOATCONV_H
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static float uint8_to_float(uint8_t value)
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{
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return ((int)value - 0x80) / (1.0 * 0x80);
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}
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static float int16_to_float(int16_t value)
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{
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return value / (1.0 * 0x8000);
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}
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static float int32_to_float(int32_t value)
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{
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return value / (1.0 * 0x80000000);
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}
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static float int24_to_float(int32_t value)
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{
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return int32_to_float((uint32_t)value << 8);
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}
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static uint32_t float_to_24b(float value)
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{
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double scaled_value = value * (8.0 * 0x100000);
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int int24;
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if (scaled_value >= (1.0 * 0x7fffff)) {
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int24 = 0x7fffff;
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} else if (scaled_value <= (-8.0 * 0x100000)) {
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int24 = -1 - 0x7fffff;
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} else {
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int24 = lrint(scaled_value);
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}
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return int24 & 0xffffff;
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}
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#endif
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