3 /*-------------------------------------------------------------------------
4 * drawElements Base Portability Library
5 * -------------------------------------
7 * Copyright 2014 The Android Open Source Project
9 * Licensed under the Apache License, Version 2.0 (the "License");
10 * you may not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
13 * http://www.apache.org/licenses/LICENSE-2.0
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
23 * \brief 16-bit floating-point math.
24 *//*--------------------------------------------------------------------*/
31 typedef deUint16 deFloat16;
33 #if defined(DE_DEPRECATED_TYPES)
34 typedef deFloat16 DEfloat16;
37 /*--------------------------------------------------------------------*//*!
38 * \brief Convert 32-bit floating point number to 16 bit.
39 * \param val32 Input value.
40 * \return Converted 16-bit floating-point value.
41 *//*--------------------------------------------------------------------*/
42 deFloat16 deFloat32To16 (float val32);
43 deFloat16 deFloat32To16Round (float val32, deRoundingMode mode);
44 void deFloat16_selfTest (void);
46 deFloat16 deFloat64To16 (double val64);
47 deFloat16 deFloat64To16Round (double val64, deRoundingMode mode);
49 /*--------------------------------------------------------------------*//*!
50 * \brief Convert 16-bit floating point number to 32 bit.
51 * \param val16 Input value.
52 * \return Converted 32-bit floating-point value.
53 *//*--------------------------------------------------------------------*/
54 float deFloat16To32 (deFloat16 val16);
56 /*--------------------------------------------------------------------*//*!
57 * \brief Convert 16-bit floating point number to 64 bit.
58 * \param val16 Input value.
59 * \return Converted 64-bit floating-point value.
60 *//*--------------------------------------------------------------------*/
61 double deFloat16To64 (deFloat16 val16);
63 DE_INLINE deBool deHalfIsPositiveZero(deFloat16 x)
65 return deFloat16To32(x) == 0 && (x >> 15) == 0;
68 DE_INLINE deBool deHalfIsNegativeZero(deFloat16 x)
70 return deFloat16To32(x) == 0 && (x >> 15) != 0;
73 static const deFloat16 deFloat16SignalingNaN = 0x7c01;
74 static const deFloat16 deFloat16QuietNaN = 0x7e01;
76 DE_INLINE deBool deHalfIsIEEENaN(deFloat16 x)
78 deUint16 e = (x & 0x7c00u) >> 10;
79 deUint16 m = (x & 0x03ffu);
80 return e == 0x1f && m != 0;
83 DE_INLINE deBool deHalfIsSignalingNaN(deFloat16 x)
85 return deHalfIsIEEENaN(x) && (x & (1u << 9)) == 0;
88 DE_INLINE deBool deHalfIsQuietNaN(deFloat16 x)
90 return deHalfIsIEEENaN(x) && (x & (1u << 9)) != 0;
95 #endif /* _DEFLOAT16_H */