733ede8ff6
In order to be coherent with the pre-existent functions, this new API is the one meant to be used when doing half float to float conversions. It is no more than a wrapper for the softfloat.h API but we meant to keep that one private. v2: - Replace custom f32 -> f16 RTZ implementation with the softfloat one (Andres). v3: - Added API usage clarifying comments (Caio). Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com> Signed-off-by: Andres Gomez <agomez@igalia.com> Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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* Copyright (C) 2018-2019 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to 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, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _HALF_FLOAT_H_
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#define _HALF_FLOAT_H_
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#include <stdbool.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define FP16_ONE 0x3C00
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#define FP16_ZERO 0
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uint16_t _mesa_float_to_half(float val);
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float _mesa_half_to_float(uint16_t val);
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uint8_t _mesa_half_to_unorm8(uint16_t v);
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uint16_t _mesa_uint16_div_64k_to_half(uint16_t v);
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/*
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* _mesa_float_to_float16_rtz is no more than a wrapper to the counterpart
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* softfloat.h call. Still, softfloat.h conversion API is meant to be kept
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* private. In other words, only use the API published here, instead of
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* calling directly the softfloat.h one.
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*/
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uint16_t _mesa_float_to_float16_rtz(float val);
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static inline uint16_t
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_mesa_float_to_float16_rtne(float val)
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{
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return _mesa_float_to_half(val);
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}
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static inline bool
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_mesa_half_is_negative(uint16_t h)
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{
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return !!(h & 0x8000);
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}
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#ifdef __cplusplus
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} /* extern C */
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#endif
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#endif /* _HALF_FLOAT_H_ */
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