Ptex: PtexHalf.h Source File

Ptex

PtexHalf.h
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1 #ifndef PtexHalf_h
2 #define PtexHalf_h
3
4 /*
5 PTEX SOFTWARE
6 Copyright 2014 Disney Enterprises, Inc. All rights reserved
7
8 Redistribution and use in source and binary forms, with or without
9 modification, are permitted provided that the following conditions are
10 met:
11
12 * Redistributions of source code must retain the above copyright
13 notice, this list of conditions and the following disclaimer.
14
15 * Redistributions in binary form must reproduce the above copyright
16 notice, this list of conditions and the following disclaimer in
17 the documentation and/or other materials provided with the
18 distribution.
19
20 * The names "Disney", "Walt Disney Pictures", "Walt Disney Animation
21 Studios" or the names of its contributors may NOT be used to
22 endorse or promote products derived from this software without
23 specific prior written permission from Walt Disney Pictures.
24
25 Disclaimer: THIS SOFTWARE IS PROVIDED BY WALT DISNEY PICTURES AND
26 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
27 BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
28 FOR A PARTICULAR PURPOSE, NONINFRINGEMENT AND TITLE ARE DISCLAIMED.
29 IN NO EVENT SHALL WALT DISNEY PICTURES, THE COPYRIGHT HOLDER OR
30 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND BASED ON ANY
34 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
37 */
38
44 #ifndef PTEXAPI
45 # if defined(_WIN32) || defined(_WINDOWS) || defined(_MSC_VER)
46 # ifndef PTEX_STATIC
47 # ifdef PTEX_EXPORTS
48 # define PTEXAPI __declspec(dllexport)
49 # else
50 # define PTEXAPI __declspec(dllimport)
51 # endif
52 # else
53 # define PTEXAPI
54 # endif
55 # else
56 # define PTEXAPI
57 # endif
58 #endif
59
60 #include "PtexInt.h"
61
62 #include "PtexVersion.h"
63
64 PTEX_NAMESPACE_BEGIN
65
88 struct PtexHalf {
89 uint16_t bits;
90
92 PtexHalf() {}
93 PtexHalf(float val) : bits(fromFloat(val)) {}
94 PtexHalf(double val) : bits(fromFloat(float(val))) {}
95 operator float() const { return toFloat(bits); }
96 PtexHalf& operator=(float val) { bits = fromFloat(val); return *this; }
97
98 static float toFloat(uint16_t h)
99 {
100 union { uint32_t i; float f; } u;
101 u.i = h2fTable[h];
102 return u.f;
103 }
104
105 static uint16_t fromFloat(float val)
106 {
107 if (val==0) return 0;
108 union { uint32_t i; float f; } u;
109 u.f = val;
110 int e = f2hTable[(u.i>>23)&0x1ff];
111 if (e) return (uint16_t)(e + (((u.i&0x7fffff) + 0x1000) >> 13));
112 return fromFloat_except(u.i);
113 }
114
115 private:
116 PTEXAPI static uint16_t fromFloat_except(uint32_t val);
117 #ifndef DOXYGEN
118 /* internal */ public:
119 #endif
120 PTEXAPI static uint32_t h2fTable[65536];
121 PTEXAPI static uint16_t f2hTable[512];
122 };
123
124 PTEX_NAMESPACE_END
125
126 using Ptex::PtexHalf;
127
128 #endif
PtexHalf::PtexHalf
PtexHalf(double val)
Definition: PtexHalf.h:94
PTEX_NAMESPACE_END
#define PTEX_NAMESPACE_END
Definition: PtexVersion.h:62
PtexHalf::h2fTable
static uint32_t h2fTable[65536]
Definition: PtexHalf.h:120
PtexHalf::PtexHalf
PtexHalf()
Default constructor, value is undefined.
Definition: PtexHalf.h:92
PtexHalf::operator=
PtexHalf & operator=(float val)
Definition: PtexHalf.h:96
PtexHalf
Half-precision (16-bit) floating-point type.
Definition: PtexHalf.h:88
PtexHalf::f2hTable
static uint16_t f2hTable[512]
Definition: PtexHalf.h:121
PtexHalf::fromFloat_except
static uint16_t fromFloat_except(uint32_t val)
Handle exceptional cases for half-to-float conversion.
Definition: PtexHalf.cpp:44
PTEX_NAMESPACE_BEGIN
Definition: PtexSeparableKernel.cpp:42
PTEXAPI
#define PTEXAPI
Definition: PtexHalf.h:56
PtexHalf::bits
uint16_t bits
Definition: PtexHalf.h:89
PtexHalf::PtexHalf
PtexHalf(float val)
Definition: PtexHalf.h:93
PtexVersion.h
PtexHalf::toFloat
static float toFloat(uint16_t h)
Definition: PtexHalf.h:98
PtexHalf::fromFloat
static uint16_t fromFloat(float val)
Definition: PtexHalf.h:105
PtexInt.h
Portable fixed-width integer types.