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SYS_Math.h
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1 /*
2  * PROPRIETARY INFORMATION. This software is proprietary to
3  * Side Effects Software Inc., and is not to be reproduced,
4  * transmitted, or disclosed in any way without written permission.
5  *
6  * NAME: SYS_Math.h (SYS Library, C++)
7  *
8  * COMMENTS: Houdini math interface.
9  * statements like: a = sin(x); b = sinf(y);
10  * we use: a = SYSsin(x); b = SYSsin(y);
11  *
12  * Functions defined here:
13  * SYSmin(a,b) - Returns the minimum of a or b
14  * SYSmin(a,b,c) - Returns the minimum of a, b or c
15  * SYSmin(a,b,c,d) - Returns minimum of a, b, c or d
16  * SYSargmin(a,b) - Returns index of minimum number
17  * SYSargmin(a,b,c) - Returns index of minimum number
18  * SYSargmin(a,b,c,d) - Returns index of minimum number
19  * SYSmax(a,b) - Returns the maximum of a or b
20  * SYSmax(a,b,c) - Returns the maximum of a, b or c
21  * SYSmax(a,b,c,d) - Returns maximum of a, b, c or d
22  * SYSsort(a, b) - Sorts so a < b
23  * SYSsort(a, b, c) - Sorts so a < b < c
24  * SYSargmax(a,b) - Returns index of largest number
25  * SYSargmax(a,b,c) - Returns index of largest number
26  * SYSargmax(a,b,c,d) - Returns index of largest number
27  * SYSabs(x) - Works for all types (including fpreal)
28  * SYSavg(a,b,c) - Return average value of 3 values
29  * SYSavg(a,b,c,d) - Return average value of 4 values
30  *
31  * SYSminmax(a,b,&min.&max) - Find min and max of 2 values
32  * SYSminmax(a,b,c,&min.&max) - Find min and max of 3 values
33  * SYSminmax(a,b,c,d,&min.&max) - Find min and max of 4 values
34  *
35  * SYSwrapmod(a, b) - Returns [0..b) interval for +ve b.
36  *
37  * SYSsignum(a) - Numerically robust Sign function:
38  * -1, if a is negative
39  * 1, if a is positive
40  * 0, otherwise:
41  *
42  * Comparison:
43  * SYSequalZero(a, [tol]) - Is a equal to zero
44  * SYSisEqual(a, b, tol) -
45  * SYSalmostEqual(a, b, ulps, tol) - Almost equal given units in last place
46  *
47  * Interpolation/Range:
48  * SYSclamp(a, min, max) - Clamp value between min and max
49  * SYSsmooth(min, max, a) - Ease-in ease-out curve
50  * SYSsmooth(min, max, a, roll) - Ease-in ease-out curve (with rolloff)
51  * SYSlerp(v1, v2, bias) - Linear interpolation
52  * SYSinvlerp(a, min, max) - Bias required to return a when
53  * lerping min and max.
54  * SYSfit(v, omin,omax, nmin,nmax) - Map v in (omin,omax) to (nmin,nmax),
55  * clamping to (nmin, nmax)
56  * SYSefit(v, omin,omax, nmin,nmax)- Map as in SYSfit() without clamping
57  * to (nmin,nmax). (ie, extrapolate)
58  *
59  * The bilerp function expects:
60  * u0v1--u1v1
61  * | |
62  * u0v0--u1v0
63  * Where u is horizontal and v is vertical in the diagram above.
64  * SYSbilerp(u0v0, u1v0, u0v1, u1v1, u, v)
65  *
66  * Standard math (single/double precision signatures):
67  * SYSsin(x)
68  * SYScos(x)
69  * SYStan(x)
70  * SYSsqrt(x)
71  * SYSlog(x)
72  * SYSfabs(x)
73  * SYStrunc(x)
74  * SYSfloor(x)
75  * SYSceil(x)
76  * SYScbrt(x) -- Use #include <SYS/SYS_MathCbrt.h>
77  * SYSlog10(x)
78  * SYSfmod(x,y)
79  * SYSpow(x,y)
80  * SYSsafepow(x, y)
81  * SYSatan(x)
82  * SYSatan(y,x) -- Note, SYSatan(y,x) is equivalent to SYSatan2(y,x)
83  * SYSatan2(y,x)
84  * SYShypot(x,y)
85  * SYSrecip(x)
86  * SYSsafediv(x,y) - Divide only if y != 0
87  * SYSsaferecip(x) - Recip only if x != 0
88  * SYSsafesqrt(x) - Compute sqrt only if x >= 0
89  * SYSsafefmod(x, y) - Mod only if y != 0
90  * SYSsincos(x,*out_sin, *out_cos)
91  *
92  * Random:
93  * SYSpointerHash - Generate a hash key for a pointer
94  * SYSwang_inthash - 32-bit Integer hashing function
95  * SYSwang_inthash64 - 64-bit Integer hashing function
96  * SYSwang2_inthash - Newer 32-bit Integer hashing function
97  * SYSwang2_inthash64 - Newer 64-bit Integer hashing function
98  * SYSreal_hash - Generate a hash for a real number
99  * SYSreal_hashseed - Generate a hash for a real number
100  * SYSvector_hash - Generate a hash for a real vector
101  * SYSfastRandom - Really fast random number generator (0,1)
102  * SYSrandom - Fast random number (fewer artifacts) (0,1)
103  * SYSfastRandomZero - Really fast random number generator (-.5, .5)
104  * SYSrandomZero - Fast random number (fewer artifacts) (-.5, .5)
105  *
106  * Rounding:
107  * SYSroundDownToMultipleOf -
108  * SYSroundUpToMultipleOf -
109  * SYSroundAngle -
110  *
111  * Misc:
112  * SYSisNan - Is this a valid floating-point number?
113  * SYSisFinite - Is not a NAN or Infinity
114  * SYSisInf - Is an Infinity
115  * SYSisNormal - Is a normalized floating point number
116  * SYSisInt - Is the string an integer
117  * SYSisFloat - Is the string a float
118  * SYSisPrime - Is it a prime?
119  * SYSsameSign(a,b) - Do the non-zero numbers have the same sign?
120  * (Note: does not work if either number is zero)
121  * SYSmakePrime - Make it a prime
122  * SYSnextPrime - Next prime
123  * SYSsincosDeg - sin/cos from degrees, multiples of 90 are accurate
124  * SYSgetSinCosFromSlope - Compute sin/cos given a slope
125  * SYShexCharToInt - map '0'-'9,'a'-'z' to 0-15, or -1
126  * SYSintToHexChar - map 0-15 to '0'-'9,'a'-'z'
127  * SYSdivMod(n,d,q,r) - q = n/d; r = n%d; The compiler should make
128  * just one DIV or IDIV instruction.
129  *
130  * For information on almostEqual, please see:
131  * http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
132  *
133  */
134 
135 #ifndef __SYS_Math__
136 #define __SYS_Math__
137 
138 #include "SYS_API.h"
139 #include "SYS_Types.h"
140 
141 /*
142  * System dependent includes
143  */
144 #if defined(LINUX)
145 # include "SYS_FastMath.h"
146 #endif
147 
148 #include <float.h>
149 #include <limits>
150 #include <math.h>
151 #include <stdio.h>
152 #include <stdlib.h>
153 
154 // We do not want to use the built-ins for srand48 or drand48 as they
155 // are not threadsafe. This version uses thread local storage to
156 // avoid that.
157 SYS_API void SYSsrand48(long seed);
158 SYS_API double SYSdrand48();
159 
160 #if !defined(SESI_ALLOW_DRAND48)
161 
162 // These macros are to aggressively prevent anyone from accidetnally
163 // using thread unsafe functions
164 #undef srand48
165 #undef drand48
166 #define srand48(X) static_assert(0, "Use SYSsrand48() instead")
167 #define drand48(X) 0; { static_assert(0, "Use SYSdrand48() instead"); }
168 
169 #endif
170 
171 // It would be useful to disable rand() and srand() as well, but
172 // they are used by std::rand :<
173 
174 template< typename F >
175 constexpr inline int
176 SYSsignum(const F a) noexcept
177 {
178  return int(F(0) < a) - int(a < F(0));
179 }
180 
181 // Determine whether f is not-a-number (NAN) for any floating point type f
182 template< typename F >
183 constexpr inline bool
184 SYSisNan(const F f)
185 {
186  return(f != f);
187 }
188 
189 template <>
190 inline bool
191 SYSisNan(const fpreal16 f)
192 {
193  return f.isNan();
194 }
195 
196 #include <cmath>
197 
198 /// Check whether a number is finite. That is, not Nan and not infinity.
199 /// @see SYSisNan()
200 /// @{
201 inline bool SYSisFinite(fpreal64 f) { return std::isfinite(f); }
202 inline bool SYSisFinite(fpreal32 f) { return std::isfinite(f); }
203 inline bool SYSisFinite(fpreal16 f) { return f.isFinite(); }
204 constexpr inline bool SYSisFinite(int32 f) { return true; }
205 constexpr inline bool SYSisFinite(int64 f) { return true; }
206 /// @}
207 
208 /// Check whether a number is an infinity.
209 /// @{
210 inline bool SYSisInf(fpreal64 f) { return std::isinf(f); }
211 inline bool SYSisInf(fpreal32 f) { return std::isinf(f); }
212 inline bool SYSisInf(fpreal16 f) { return f.isInfinity(); }
213 constexpr inline bool SYSisInf(int32 f) { return false; }
214 constexpr inline bool SYSisInf(int64 f) { return false; }
215 /// @}
216 
217 /// SYSisNormal() checks whether the string represents a non-finite number
218 /// @{
219 inline bool SYSisNormal(fpreal64 f) { return std::isnormal(f); }
220 inline bool SYSisNormal(fpreal32 f) { return std::isnormal(f); }
221 inline bool SYSisNormal(fpreal16 f) { return f.isNormalized(); }
222 constexpr inline bool SYSisNormal(int32 f) { return true; }
223 constexpr inline bool SYSisNormal(int64 f) { return true; }
224 /// @}
225 
226 /// SYSisNan() checks whether the string represents a non-finite number
227 SYS_API bool SYSisNan(const char *number);
228 SYS_API bool SYSisInt(const char *str);
229 SYS_API bool SYSisFloat(const char *str);
230 SYS_API fpreal32 SYSroundAngle(fpreal32 base, fpreal32 source);
231 SYS_API fpreal64 SYSroundAngle(fpreal64 base, fpreal64 source);
232 SYS_API fpreal64 SYSroundAngle(int32 base, int32 source);
233 SYS_API fpreal64 SYSroundAngle(int64 base, int64 source);
234 SYS_API bool SYSisPrime(uint num);
235 SYS_API bool SYSisPrime(uint64 num);
236 SYS_API uint SYSmakePrime(uint num);
237 SYS_API uint64 SYSmakePrime(uint64 num);
238 
239 #if defined(__cplusplus)
240 
241 // NOTE:
242 // These have been carefully written so that in the case of equality
243 // we always return the first parameter. This is so that NANs in
244 // in the second parameter are suppressed.
245 #define h_min(a, b) (((a) > (b)) ? (b) : (a))
246 #define h_argmin(a, b) (((a) > (b)) ? 1 : 0)
247 #define h_max(a, b) (((a) < (b)) ? (b) : (a))
248 #define h_argmax(a, b) (((a) < (b)) ? 1 : 0)
249 // DO NOT CHANGE THE ABOVE WITHOUT READING THE COMMENT
250 #define h_abs(a) (((a) > 0) ? (a) : -(a))
251 #define h_sgn(a) (((a) > 0) ? 1 : (((a) < 0) ? -1 : 0))
252 
253 
254 static constexpr inline int16 SYSmin(int16 a, int16 b) { return h_min(a,b); }
255 static constexpr inline int16 SYSmax(int16 a, int16 b) { return h_max(a,b); }
256 static constexpr inline int16 SYSabs(int16 a) { return h_abs(a); }
257 static constexpr inline int16 SYSsgn(int16 a) { return h_sgn(a); }
258 static constexpr inline int SYSargmin(int16 a, int16 b) { return h_argmin(a,b);}
259 static constexpr inline int SYSargmax(int16 a, int16 b) { return h_argmax(a,b);}
260 static constexpr inline int32 SYSmin(int32 a, int32 b) { return h_min(a,b); }
261 static constexpr inline int32 SYSmax(int32 a, int32 b) { return h_max(a,b); }
262 static constexpr inline int32 SYSabs(int32 a) { return h_abs(a); }
263 static constexpr inline int32 SYSsgn(int32 a) { return h_sgn(a); }
264 static constexpr inline int SYSargmin(int32 a, int32 b) { return h_argmin(a,b);}
265 static constexpr inline int SYSargmax(int32 a, int32 b) { return h_argmax(a,b);}
266 static constexpr inline int64 SYSmin(int64 a, int64 b) { return h_min(a,b); }
267 static constexpr inline int64 SYSmax(int64 a, int64 b) { return h_max(a,b); }
268 static constexpr inline int64 SYSmin(int32 a, int64 b) { return h_min(a,b); }
269 static constexpr inline int64 SYSmax(int32 a, int64 b) { return h_max(a,b); }
270 static constexpr inline int64 SYSmin(int64 a, int32 b) { return h_min(a,b); }
271 static constexpr inline int64 SYSmax(int64 a, int32 b) { return h_max(a,b); }
272 static constexpr inline int64 SYSabs(int64 a) { return h_abs(a); }
273 static constexpr inline int64 SYSsgn(int64 a) { return h_sgn(a); }
274 static constexpr inline int SYSargmin(int64 a, int64 b) { return h_argmin(a,b);}
275 static constexpr inline int SYSargmax(int64 a, int64 b) { return h_argmax(a,b);}
276 static constexpr inline uint16 SYSmin(uint16 a, uint16 b) { return h_min(a,b); }
277 static constexpr inline uint16 SYSmax(uint16 a, uint16 b) { return h_max(a,b); }
278 static constexpr inline int SYSargmin(uint16 a, uint16 b) { return h_argmin(a,b);}
279 static constexpr inline int SYSargmax(uint16 a, uint16 b) { return h_argmax(a,b);}
280 static constexpr inline uint32 SYSmin(uint32 a, uint32 b) { return h_min(a,b); }
281 static constexpr inline uint32 SYSmax(uint32 a, uint32 b) { return h_max(a,b); }
282 static constexpr inline int SYSargmin(uint32 a, uint32 b) { return h_argmin(a,b);}
283 static constexpr inline int SYSargmax(uint32 a, uint32 b) { return h_argmax(a,b);}
284 static constexpr inline uint64 SYSmin(uint64 a, uint64 b) { return h_min(a,b); }
285 static constexpr inline uint64 SYSmax(uint64 a, uint64 b) { return h_max(a,b); }
286 static constexpr inline int SYSargmin(uint64 a, uint64 b) { return h_argmin(a,b);}
287 static constexpr inline int SYSargmax(uint64 a, uint64 b) { return h_argmax(a,b);}
288 static inline fpreal16 SYSmin(fpreal16 a, fpreal16 b) { return h_min(a,b); }
289 static inline fpreal16 SYSmax(fpreal16 a, fpreal16 b) { return h_max(a,b); }
290 static inline fpreal16 SYSsgn(fpreal16 a) { return h_sgn(a); }
291 static inline int SYSargmin(fpreal16 a, fpreal16 b){ return h_argmin(a,b);}
292 static inline int SYSargmax(fpreal16 a, fpreal16 b){ return h_argmax(a,b);}
293 static constexpr inline fpreal32 SYSmin(fpreal32 a, fpreal32 b) { return h_min(a,b); }
294 static constexpr inline fpreal32 SYSmax(fpreal32 a, fpreal32 b) { return h_max(a,b); }
295 static constexpr inline fpreal32 SYSsgn(fpreal32 a) { return h_sgn(a); }
296 static constexpr inline int SYSargmin(fpreal32 a, fpreal32 b){ return h_argmin(a,b);}
297 static constexpr inline int SYSargmax(fpreal32 a, fpreal32 b){ return h_argmax(a,b);}
298 static constexpr inline fpreal64 SYSmin(fpreal64 a, fpreal64 b) { return h_min(a,b); }
299 static constexpr inline fpreal64 SYSmax(fpreal64 a, fpreal64 b) { return h_max(a,b); }
300 static constexpr inline fpreal64 SYSsgn(fpreal64 a) { return h_sgn(a); }
301 static constexpr inline int SYSargmin(fpreal64 a, fpreal64 b){ return h_argmin(a,b);}
302 static constexpr inline int SYSargmax(fpreal64 a, fpreal64 b){ return h_argmax(a,b);}
303 
304 // Some systems have size_t as a seperate type from uint. Some don't.
305 #if defined(MBSD)
306 static constexpr inline size_t SYSmin(size_t a, size_t b) { return h_min(a,b); }
307 static constexpr inline size_t SYSmax(size_t a, size_t b) { return h_max(a,b); }
308 static constexpr inline int SYSargmin(size_t a, size_t b) { return h_argmin(a,b);}
309 static constexpr inline int SYSargmax(size_t a, size_t b) { return h_argmax(a,b);}
310 static constexpr inline size_t SYSmin(long a, long b) { return h_min(a,b); }
311 static constexpr inline size_t SYSmax(long a, long b) { return h_max(a,b); }
312 static constexpr inline int SYSargmin(long a, long b) { return h_argmin(a,b);}
313 static constexpr inline int SYSargmax(long a, long b) { return h_argmax(a,b);}
314 #endif
315 
316 #undef h_min
317 #undef h_max
318 #undef h_abs
319 #undef h_sgn
320 
321 #define h_clamp(val, min, max, tol) \
322  ((val <= min+tol) ? min : ((val >= max-tol) ? max : val))
323 
324  static constexpr inline int
325  SYSclamp(int v, int min, int max)
326  { return h_clamp(v, min, max, 0); }
327 
328  static constexpr inline uint
329  SYSclamp(uint v, uint min, uint max)
330  { return h_clamp(v, min, max, 0); }
331 
332  static constexpr inline int64
333  SYSclamp(int64 v, int64 min, int64 max)
334  { return h_clamp(v, min, max, CONST_INT64(0)); }
335 
336  static constexpr inline uint64
337  SYSclamp(uint64 v, uint64 min, uint64 max)
338  { return h_clamp(v, min, max, CONST_UINT64(0)); }
339 
340  static constexpr inline fpreal32
341  SYSclamp(fpreal32 v, fpreal32 min, fpreal32 max, fpreal32 tol=(fpreal32)0)
342  { return h_clamp(v, min, max, tol); }
343 
344  static constexpr inline fpreal64
345  SYSclamp(fpreal64 v, fpreal64 min, fpreal64 max, fpreal64 tol=(fpreal64)0)
346  { return h_clamp(v, min, max, tol); }
347 
348 #undef h_clamp
349 
350 // clamp float to [0, 1]
351 static constexpr inline float SYSclamp01(float v)
352  { return SYSclamp(v, 0.f, 1.f); }
353 static constexpr inline double SYSclamp01(double v)
354  { return SYSclamp(v, 0.0, 1.0); }
355 
356 // clamp float to [0, 1)
357 static constexpr inline float SYSclamp01_excl1(float v)
358  { return SYSclamp(v, 0.f, 1.f - FLT_EPSILON/FLT_RADIX); }
359 static constexpr inline double SYSclamp01_excl1(double v)
360  { return SYSclamp(v, 0.0, 1.0 - DBL_EPSILON/FLT_RADIX); }
361 
362 /// This converts from one integer type to another by clamping
363 /// the range, instead of the usual wrapping.
364 template<typename OUTTYPE,typename INTYPE>
365 constexpr OUTTYPE SYSclampInt(INTYPE value)
366 {
367  value = SYSclamp(value, (INTYPE)std::numeric_limits<OUTTYPE>::min(),
368  (INTYPE)std::numeric_limits<OUTTYPE>::max());
369  return OUTTYPE(value);
370 }
371 
372 // Wrapper for libm math function calls
373 #if defined(LINUX)
374 # define SYS_MF(X) SYS_FastMath::X
375 #else
376 # define SYS_MF(X) ::X
377 #endif
378 
379 #define SYS_UNARY(func) \
380  static inline fpreal64 SYS##func(fpreal64 arg) \
381  { return SYS_MF(func)(arg); } \
382  static inline fpreal32 SYS##func(fpreal32 arg) \
383  { return SYS_MF(func##f)(arg); } \
384  static inline fpreal64 SYS##func(int64 arg) \
385  { return SYS_MF(func)((fpreal64)arg); } \
386  static inline fpreal64 SYS##func(int32 arg) \
387  { return SYS_MF(func)((fpreal64)arg); } \
388  /* end macro */
389 #define SYS_BINARY(func) \
390  static inline fpreal64 SYS##func(fpreal64 a, fpreal64 b) \
391  { return SYS_MF(func)(a,b); } \
392  static inline fpreal32 SYS##func(fpreal32 a, fpreal32 b) \
393  { return SYS_MF(func##f)(a, b); } \
394  /* end macro */
395 
396 #if defined(WIN32)
397 #define hypotf(x,y) hypot((x),(y))
398 #endif
399 
400  SYS_UNARY(sin)
401  SYS_UNARY(cos)
402  SYS_UNARY(tan)
403  SYS_UNARY(sinh)
404  SYS_UNARY(cosh)
405  SYS_UNARY(tanh)
406  SYS_UNARY(sqrt)
407  SYS_UNARY(trunc)
408  SYS_UNARY(exp)
409  SYS_BINARY(fmod)
410  SYS_BINARY(pow)
411  SYS_BINARY(atan2)
412  SYS_BINARY(hypot)
413  SYS_BINARY(copysign)
414 
415 
416 #define SYS_UNARY_PI(func) \
417  static inline fpreal64 SYS##func##pi(fpreal64 arg) \
418  { return SYS##func( SYSfmod(arg, 2.0) * M_PI ); } \
419  static inline fpreal32 SYS##func##pi(fpreal32 arg) \
420  { return SYS##func( SYSfmod(arg, 2.0f) * M_PI ); } \
421  static inline fpreal64 SYS##func##pi(int64 arg) \
422  { return SYS##func( (arg % 2) * M_PI ); } \
423  static inline fpreal32 SYS##func##pi(int32 arg) \
424  { return SYS##func( (arg % 2) * M_PI ); } \
425 /**/
426  SYS_UNARY_PI(sin)
427  SYS_UNARY_PI(cos)
428  SYS_UNARY_PI(tan)
429 #undef SYS_UNARY_PI
430 
431  static constexpr inline fpreal32 SYSsafediv(fpreal32 x, fpreal32 y)
432  { return x/(y != 0 ? y : SYS_Types<fpreal32>::infinity()); }
433  static constexpr inline fpreal64 SYSsafediv(fpreal64 x, fpreal64 y)
434  { return x/(y != 0 ? y : SYS_Types<fpreal64>::infinity()); }
435  static constexpr inline fpreal32 SYSsafesqrt(fpreal32 x)
436  { return x > 0 ? SYSsqrt(x) : 0; }
437  static constexpr inline fpreal64 SYSsafesqrt(fpreal64 x)
438  { return x > 0 ? SYSsqrt(x) : 0; }
439  static constexpr inline fpreal32 SYSsafefmod(fpreal32 x, fpreal32 y)
440  { return y != 0 ? SYSfmod(x, y) : 0; }
441  static constexpr inline fpreal64 SYSsafefmod(fpreal64 x, fpreal64 y)
442  { return y != 0 ? SYSfmod(x, y) : 0; }
443 
444 #if defined(LINUX)
445  static inline void SYSsincos(fpreal32 x, fpreal32 *s, fpreal32 *c)
446  { SYS_MF(sincosf)(x,s,c); }
447  static inline void SYSsincos(fpreal64 x, fpreal64 *s, fpreal64 *c)
448  { SYS_MF(sincos)(x,s,c); }
449  static inline void SYSsincos(fpreal32 x, fpreal16 *s, fpreal16 *c)
450  {
451  fpreal32 s32, c32;
452  SYS_MF(sincosf)(x,&s32,&c32);
453  *s = (fpreal16)s32;
454  *c = (fpreal16)c32;
455  }
456 #elif defined(MBSD)
457  static inline void SYSsincos(fpreal32 x, fpreal32 *s, fpreal32 *c)
458  { __sincosf(x,s,c); }
459  static inline void SYSsincos(fpreal64 x, fpreal64 *s, fpreal64 *c)
460  { __sincos(x,s,c); }
461  static inline void SYSsincos(fpreal32 x, fpreal16 *s, fpreal16 *c)
462  {
463  fpreal32 s32, c32;
464  __sincosf(x,&s32,&c32);
465  *s = (fpreal16)s32;
466  *c = (fpreal16)c32;
467  }
468 #else
469  static inline void SYSsincos(fpreal32 x, fpreal32 *s, fpreal32 *c)
470  { *s = SYSsin(x); *c = SYScos(x); }
471  static inline void SYSsincos(fpreal64 x, fpreal64 *s, fpreal64 *c)
472  { *s = SYSsin(x); *c = SYScos(x); }
473  static inline void SYSsincos(fpreal32 x, fpreal16 *s, fpreal16 *c)
474  { *s = (fpreal16)SYSsin(x); *c = (fpreal16)SYScos(x); }
475 #endif
476 
477 #if 0
478 #include <xmmintrin.h>
479  /// Computes 1/sqrt(x) to about 11.4 bits of accuracy
480  static inline fpreal32 SYSrsqrt11(fpreal32 x)
481  {
482 #if defined(WIN32) || defined(LINUX) || defined(MBSD)
483  union {
484  fpreal32 val;
485  __m128 vec;
486  };
487  val = x;
488  vec = _mm_rsqrt_ss(vec);
489  return val;
490 #else
491  return 1.0f/SYSsqrt(x);
492 #endif
493  }
494 
495  /// Computes 1/sqrt(x) to about 22.2 bits of accuracy
496  static inline fpreal32 SYSrsqrt22(fpreal32 x)
497  {
498 #if defined(WIN32) || defined(LINUX) || defined(MBSD)
499  fpreal32 approximate = SYSrsqrt11(x);
500  // -(((1+e)/sqrt(x))^2 * x - 3) * ((1+e)/sqrt(x)) / 2
501  // -(-1 + e + (e^2)/2) * ((1+e)/sqrt(x))
502  // -(-1 + e + (e^2)/2 - e + e^2 + (e^3)/2) / sqrt(x)
503  // (1 - 3(e^2)/2 - (e^3)/2) / sqrt(x);
504  fpreal32 result = (approximate*approximate*x - 3)*approximate*-0.5f;
505 #else
506  fpreal32 result = 1.0f/SYSsqrt(x);
507 #endif
508  return result;
509  }
510 #endif
511 
512  static inline fpreal32 SYSlog(fpreal32 v) { return v <= 0 ? 0 : SYS_MF(logf)(v); }
513  static inline fpreal64 SYSlog(fpreal64 v) { return v <= 0 ? 0 : SYS_MF(log)(v); }
514  static inline fpreal32 SYSlog10(fpreal32 v) { return v <= 0 ? 0 : SYS_MF(log10f)(v); }
515  static inline fpreal64 SYSlog10(fpreal64 v) { return v <= 0 ? 0 : SYS_MF(log10)(v); }
516 
517 #if defined(WIN32)
518  static inline fpreal32 SYSexpm1(fpreal32 x) { return SYSexp(x) - 1; }
519  static inline fpreal64 SYSexpm1(fpreal64 x) { return SYSexp(x) - 1; }
520  static inline fpreal32 SYSlog1p(fpreal32 x) { return SYSlog(x+1); }
521  static inline fpreal64 SYSlog1p(fpreal64 x) { return SYSlog(x+1); }
522 #else
523  SYS_UNARY(expm1)
524  SYS_UNARY(log1p)
525 #endif
526 
527  // integer log2 (incorrect for 0, gives -1)
528  static inline int32 SYSlog2Int(uint32 x)
529  {
530  // branchless integer log2, http://guihaire.com/code/?p=414
531  if (x == 0)
532  return -1;
533  uint32 r = (x > 0xFFFFu) << 4; x >>= r;
534  uint32 shift = (x > 0xFFu ) << 3; x >>= shift; r |= shift;
535  shift = (x > 0xFu ) << 2; x >>= shift; r |= shift;
536  shift = (x > 0x3u ) << 1;
537  return r | shift | (x >> (shift+1));
538  }
539 
540 #undef SYS_UNARY
541 #undef SYS_BINARY
542 #undef hypotf
543 
544 static inline fpreal32 SYSabs(fpreal32 a) { return SYS_MF(fabsf)(a); }
545 static inline fpreal64 SYSabs(fpreal64 a) { return SYS_MF(fabs)(a); }
546 static inline fpreal32 SYSfabs(fpreal32 a) { return SYS_MF(fabsf)(a); }
547 static inline fpreal64 SYSfabs(fpreal64 a) { return SYS_MF(fabs)(a); }
548 
549 #include "SYS_Floor.h"
550 
551 static inline fpreal32 SYSasin(fpreal32 a)
552  { return SYS_MF(asinf)(SYSclamp(a, (fpreal32)-1, (fpreal32)1)); }
553 static inline fpreal32 SYSacos(fpreal32 a)
554  { return SYS_MF(acosf)(SYSclamp(a, (fpreal32)-1, (fpreal32)1)); }
555 static inline fpreal32 SYSatan(fpreal32 a)
556  { return SYS_MF(atanf)(a); }
557 static inline fpreal32 SYSatan(fpreal32 y, fpreal32 x)
558  { return SYS_MF(atan2f)(y, x); }
559 static inline fpreal64 SYSasin(fpreal64 a)
560  { return SYS_MF(asin) (SYSclamp(a, (fpreal64)-1, (fpreal64)1)); }
561 static inline fpreal64 SYSacos(fpreal64 a)
562  { return SYS_MF(acos) (SYSclamp(a, (fpreal64)-1, (fpreal64)1)); }
563 static inline fpreal64 SYSatan(fpreal64 a)
564  { return SYS_MF(atan) (a); }
565 static inline fpreal64 SYSatan(fpreal64 y, fpreal64 x)
566  { return SYS_MF(atan2)(y, x); }
567 
568 static inline fpreal32 SYSsafepow(fpreal32 x, fpreal32 y)
569  { return x > 0 ? SYSpow(x, y) : x < 0 ? SYSpow(x, SYSrint(y)) : y == 0 ? 1 : 0; }
570 static inline fpreal64 SYSsafepow(fpreal64 x, fpreal64 y)
571  { return x > 0 ? SYSpow(x, y) : x < 0 ? SYSpow(x, SYSrint(y)) : y == 0 ? 1 : 0; }
572 
573 static constexpr inline fpreal32 SYSrecip(fpreal32 a) { return 1 / a; }
574 static constexpr inline fpreal64 SYSrecip(fpreal64 a) { return 1 / a; }
575 static constexpr inline fpreal32 SYSrecip(int32 a) { return 1 / (fpreal32)a; }
576 static constexpr inline fpreal64 SYSrecip(int64 a) { return 1 / (fpreal64)a; }
577 static constexpr inline fpreal32 SYSsaferecip(fpreal32 a)
578  { return SYSsafediv( (fpreal32)1, a ); }
579 static constexpr inline fpreal64 SYSsaferecip(fpreal64 a)
580  { return SYSsafediv( (fpreal64)1, a ); }
581 static constexpr inline fpreal32 SYSsaferecip(int32 a)
582  { return SYSsafediv( (fpreal32)1, (fpreal32)a ); }
583 static constexpr inline fpreal64 SYSsaferecip(int64 a)
584  { return SYSsafediv( (fpreal64)1, (fpreal64)a ); }
585 
586 static constexpr inline fpreal32 SYSdegToRad(fpreal32 a) { return a*(fpreal32)(M_PI/180.0); }
587 static constexpr inline fpreal64 SYSdegToRad(fpreal64 a) { return a*(fpreal64)(M_PI/180.0); }
588 static constexpr inline fpreal64 SYSdegToRad(int32 a) { return a*(fpreal64)(M_PI/180.0); }
589 static constexpr inline fpreal64 SYSdegToRad(int64 a) { return a*(fpreal64)(M_PI/180.0); }
590 
591 static constexpr inline fpreal32 SYSradToDeg(fpreal32 a) { return a*(fpreal32)(180.0/M_PI); }
592 static constexpr inline fpreal64 SYSradToDeg(fpreal64 a) { return a*(fpreal64)(180.0/M_PI); }
593 static constexpr inline fpreal64 SYSradToDeg(int32 a) { return a*(fpreal32)(180.0/M_PI); }
594 static constexpr inline fpreal64 SYSradToDeg(int64 a) { return a*(fpreal64)(180.0/M_PI); }
595 
596 static constexpr inline fpreal32 SYSpow2(fpreal32 a) { return a*a; }
597 static constexpr inline fpreal64 SYSpow2(fpreal64 a) { return a*a; }
598 static constexpr inline fpreal32 SYSpow3(fpreal32 a) { return a*a*a; }
599 static constexpr inline fpreal64 SYSpow3(fpreal64 a) { return a*a*a; }
600 static constexpr inline fpreal32 SYSpow4(fpreal32 a) { return SYSpow2(SYSpow2(a)); }
601 static constexpr inline fpreal64 SYSpow4(fpreal64 a) { return SYSpow2(SYSpow2(a)); }
602 static constexpr inline fpreal32 SYSpow5(fpreal32 a) { return SYSpow4(a) * a; }
603 static constexpr inline fpreal64 SYSpow5(fpreal64 a) { return SYSpow4(a) * a; }
604 
605 #define h_compare(func, code) \
606  static inline bool func(fpreal32 a, fpreal32 b, \
607  fpreal32 tol=SYS_FTOLERANCE) \
608  { return code; } \
609  static inline bool func(fpreal64 a, fpreal64 b, \
610  fpreal64 tol=SYS_FTOLERANCE_D) \
611  { return code; }
612 #define h_compare_ce(func, code) \
613  static constexpr inline bool func(fpreal32 a, fpreal32 b, \
614  fpreal32 tol=SYS_FTOLERANCE) \
615  { return code; } \
616  static constexpr inline bool func(fpreal64 a, fpreal64 b, \
617  fpreal64 tol=SYS_FTOLERANCE_D) \
618  { return code; }
619 
620  static constexpr inline bool
621  SYSequalZero(fpreal32 a, fpreal32 tol=SYS_FTOLERANCE)
622  { return a >= -tol && a <= tol; }
623 
624  static constexpr inline bool
625  SYSequalZero(fpreal64 a, fpreal64 tol=SYS_FTOLERANCE_D)
626  { return a >= -tol && a <= tol; }
627 
628  static constexpr inline bool
629  SYSequalZero(int32 a, fpreal64 tol=SYS_FTOLERANCE_D)
630  { return a >= -tol && a <= tol; }
631 
632  static constexpr inline bool
633  SYSequalZero(int64 a, fpreal64 tol=SYS_FTOLERANCE_D)
634  { return a >= -tol && a <= tol; }
635 
636  h_compare(SYSisEqual, SYSabs(a-b)<=tol)
637  h_compare_ce(SYSisGreater, (a-b) > tol)
638  h_compare_ce(SYSisGreaterOrEqual, (a-b) >= -tol)
639  h_compare_ce(SYSisLess, (a-b) < -tol)
640  h_compare_ce(SYSisLessOrEqual, (a-b) <= tol)
641 #undef h_compare
642 #undef h_compare_ce
643 
644 constexpr inline bool SYSisEqual(int32 a, int32 b) { return a == b; }
645 constexpr inline bool SYSisEqual(int64 a, int64 b) { return a == b; }
646 constexpr inline bool SYSisGreater(int32 a, int32 b) { return a > b; }
647 constexpr inline bool SYSisGreater(int64 a, int64 b) { return a > b; }
648 constexpr inline bool SYSisGreaterOrEqual(int32 a, int32 b) { return a >= b; }
649 constexpr inline bool SYSisGreaterOrEqual(int64 a, int64 b) { return a >= b; }
650 constexpr inline bool SYSisLess(int32 a, int32 b) { return a < b; }
651 constexpr inline bool SYSisLess(int64 a, int64 b) { return a < b; }
652 constexpr inline bool SYSisLessOrEqual(int32 a, int32 b) { return a <= b; }
653 constexpr inline bool SYSisLessOrEqual(int64 a, int64 b) { return a <= b; }
654 
655 static inline bool
656 SYSalmostEqual(fpreal32 a, fpreal32 b, int ulps=50, fpreal32 tol = 1e-6)
657 {
658  // check if they are absolutely close together (only possible near zero)
659  if (SYSfabs(a - b) <= tol)
660  return true;
661 
662  // we keep the following check in to allow points that are within 1e-15 of
663  // zero to be "equal" for backwards compatibility (so 6e-16 and -6e-16 are
664  // "equal" even though they may not be within 1e-15, for example):
665  // If both double-precision floats are very close to zero, we consider them
666  // equal.
667  if((SYSabs(a) < 1e-6) && (SYSabs(b) < 1e-6))
668  return true;
669 
670  // if they have different signs they are not equal (since they must be at
671  // least tol distance apart by this point, there is no trickiness with +-0)
672  if ((a < 0) != (b < 0))
673  return false;
674 
675  SYS_FPRealUnionF ai, bi;
676  ai.fval = a;
677  bi.fval = b;
678 
679  // find the difference in ulps
680  // We're very careful to avoid signed integer overflow here.
681  if ((ai.uval > bi.uval ? ai.uval - bi.uval : bi.uval - ai.uval) <= ulps)
682  return true;
683 
684  return false;
685 }
686 
687 // adapted from AlmostEqualUlpsAndAbs from:
688 // https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
689 static inline bool
690 SYSalmostEqual(fpreal64 a, fpreal64 b, int64 ulps, fpreal64 tol = 1e-15)
691 {
692  // check if they are absolutely close together (only possible near zero)
693  if (SYSfabs(a - b) <= tol)
694  return true;
695 
696  // we keep the following check in to allow points that are within 1e-15 of
697  // zero to be "equal" for backwards compatibility (so 6e-16 and -6e-16 are
698  // "equal" even though they may not be within 1e-15, for example):
699  // If both double-precision floats are very close to zero, we consider them
700  // equal.
701  if((SYSabs(a) < 1e-15) && (SYSabs(b) < 1e-15))
702  return true;
703 
704  // if they have different signs they are not equal (since they must be at
705  // least tol distance apart by this point, there is no trickiness with +-0)
706  if ((a < 0) != (b < 0))
707  return false;
708 
709  SYS_FPRealUnionD ai, bi;
710  ai.fval = a;
711  bi.fval = b;
712 
713  // find the difference in ulps
714  // We're very careful to avoid signed integer overflow here.
715  if ((ai.uval > bi.uval ? ai.uval - bi.uval : bi.uval - ai.uval) <= ulps)
716  return true;
717 
718  return false;
719 }
720 
721 static inline bool
722 SYSalmostEqual(fpreal64 a, fpreal64 b, int32 ulps=50, fpreal64 tol = 1e-15)
723 {
724  return SYSalmostEqual(a, b, (int64)ulps, tol);
725 }
726 
727 static inline bool SYSisInteger(fpreal32 val)
728  { return SYSisEqual(val, SYSfloor(val)) || SYSisEqual(val, SYSceil(val)); }
729 static inline bool SYSisInteger(fpreal64 val)
730  { return SYSisEqual(val, SYSfloor(val)) || SYSisEqual(val, SYSceil(val)); }
731 
732 #define h_max3(type) \
733  static constexpr inline type \
734  SYSmax(type v0, type v1, type v2) { \
735  return SYSmax(v2, SYSmax(v0, v1)); \
736  }
737 #define h_max4(type) \
738  static constexpr inline type \
739  SYSmax(type v0, type v1, type v2, type v3) { \
740  return SYSmax(SYSmax(v0, v1), SYSmax(v2, v3)); \
741  }
742 #define h_argmax3(type) \
743  static constexpr inline int \
744  SYSargmax(type v0, type v1, type v2) { \
745  return v2 > SYSmax(v0, v1) ? 2 : SYSargmax(v0, v1); \
746  }
747 #define h_argmax4(type) \
748  static constexpr inline int \
749  SYSargmax(type v0, type v1, type v2, type v3) { \
750  return SYSmax(v0, v1) < SYSmax(v2, v3) ? \
751  (SYSargmax(v2, v3) + 2) : SYSargmax(v0, v1); \
752  }
753 #define h_min3(type) \
754  static constexpr inline type \
755  SYSmin(type v0, type v1, type v2) { \
756  return SYSmin(v2, SYSmin(v0, v1)); \
757  }
758 #define h_min4(type) \
759  static constexpr inline type \
760  SYSmin(type v0, type v1, type v2, type v3) { \
761  return SYSmin(SYSmin(v0, v1), SYSmin(v2, v3)); \
762  }
763 #define h_argmin3(type) \
764  static constexpr inline int \
765  SYSargmin(type v0, type v1, type v2) { \
766  return v2 < SYSmin(v0, v1) ? 2 : SYSargmin(v0, v1); \
767  }
768 #define h_argmin4(type) \
769  static constexpr inline int \
770  SYSargmin(type v0, type v1, type v2, type v3) { \
771  return SYSmin(v0, v1) > SYSmin(v2, v3) ? \
772  (SYSargmin(v2, v3) + 2) : SYSargmin(v0, v1); \
773  }
774 
775 
776 #define h_max(type) h_min3(type) h_min4(type) h_max3(type) h_max4(type) \
777  h_argmin3(type) h_argmin4(type) \
778  h_argmax3(type) h_argmax4(type)
779 
780 #define h_avg3(type) \
781  static constexpr inline type \
782  SYSavg(type v0, type v1, type v2) { \
783  return (v0+v1+v2) * ((type)(1.0/3.0)); \
784  }
785 #define h_avg4(type) \
786  static constexpr inline type \
787  SYSavg(type v0, type v1, type v2, type v3) { \
788  return (v0+v1+v2+v3) * ((type)0.25); \
789  }
790 
791 #define h_avg(type) h_avg3(type) h_avg4(type)
792 
793 h_max(int8)
794 h_max(uint8)
795 h_max(int16)
796 h_max(uint16)
797 h_max(int32)
798 h_max(uint32)
799 h_max(int64)
800 h_max(uint64)
801 h_max(fpreal32) h_avg(fpreal32)
802 h_max(fpreal64) h_avg(fpreal64)
803 
804 static constexpr inline int32
805 SYSavg(int32 a, int32 b, int32 c)
806 { return (a + b + c + 1) / 3; }
807 static constexpr inline int32
808 SYSavg(int32 a, int32 b, int32 c, int32 d)
809 { return (a + b + c + d + 2) / 4; }
810 
811 static constexpr inline int64
812 SYSavg(int64 a, int64 b, int64 c)
813 { return (a + b + c + 1) / 3; }
814 static constexpr inline int64
815 SYSavg(int64 a, int64 b, int64 c, int64 d)
816 { return (a + b + c + d + 2) / 4; }
817 
818 // Some systems have size_t as a seperate type from uint. Some don't.
819 #if defined(MBSD)
820 h_max(size_t)
821 #endif
822 
823 #undef h_min3
824 #undef h_min4
825 #undef h_max3
826 #undef h_max4
827 #undef h_argmin3
828 #undef h_argmin4
829 #undef h_argmax3
830 #undef h_argmax4
831 #undef h_avg3
832 #undef h_avg4
833 #undef h_max
834 #undef h_avg
835 
836 /// @{
837 /// Linear interpolation between v0 and v1.
838 static constexpr inline fpreal32
839 SYSlerp(fpreal32 v1, fpreal32 v2, fpreal32 t)
840 {
841  return v1 + (v2 - v1)*t;
842 }
843 
844 static constexpr inline fpreal64
845 SYSlerp(fpreal64 v1, fpreal64 v2, fpreal64 t)
846 {
847  return v1 + (v2 - v1)*t;
848 }
849 /// @}
850 
851 /// @{
852 /// Bilinear interpolation over a quadrilateral: @code
853 /// (u=0,v=1) u0v1 u1v1 (u=1,v=1)
854 /// +--------+
855 /// | |
856 /// | |
857 /// +--------+
858 /// (u=0,v=0) u0v0 u1v0 (u=1,v=0)
859 /// @endcode
860 static constexpr inline fpreal32
861 SYSbilerp(fpreal32 u0v0, fpreal32 u1v0, fpreal32 u0v1, fpreal32 u1v1,
862  fpreal32 u, fpreal32 v)
863 {
864  return SYSlerp(SYSlerp(u0v0, u0v1, v), SYSlerp(u1v0, u1v1, v), u);
865 }
866 
867 static constexpr inline fpreal64
868 SYSbilerp(fpreal64 u0v0, fpreal64 u1v0, fpreal64 u0v1, fpreal64 u1v1,
869  fpreal64 u, fpreal64 v)
870 {
871  return SYSlerp(SYSlerp(u0v0, u0v1, v), SYSlerp(u1v0, u1v1, v), u);
872 }
873 /// @}
874 
875 /// @{
876 /// Barycentric coordinates do interpolation over the triangle specified by the
877 /// three vertices (v0, v1, v2): @code
878 /// | (u=0,v=1) |
879 /// | v2 |
880 /// | / \ |
881 /// | / \ |
882 /// | / \ |
883 /// | (u=0,v=0) v0------v1 (u=1,v=0) |
884 /// @endcode
885 static constexpr inline fpreal32
886 SYSbarycentric(fpreal32 v0, fpreal32 v1, fpreal32 v2, fpreal32 u, fpreal32 v)
887 {
888  return v0*(1-u-v) + v1*u + v2*v;
889 }
890 
891 static constexpr inline fpreal64
892 SYSbarycentric(fpreal64 v0, fpreal64 v1, fpreal64 v2, fpreal64 u, fpreal64 v)
893 {
894  return v0*(1-u-v) + v1*u + v2*v;
895 }
896 /// @}
897 
898 /// @{
899 /// Wrap mod is like mod, but returns [0..b) interval thereby
900 /// usually giving a more useful result.
901 /// This is always defined as safe!
902 /// @}
903 static constexpr inline fpreal32
904 SYSwrapmod(fpreal32 a, fpreal32 b)
905 {
906  fpreal32 r = SYSsafefmod(a, b);
907  return ((a < 0) ^ (b < 0) && r != 0.0f) ? r+b : r;
908 }
909 
910 static constexpr inline fpreal64
911 SYSwrapmod(fpreal64 a, fpreal64 b)
912 {
913  fpreal64 r = SYSsafefmod(a, b);
914  return ((a < 0) ^ (b < 0) && r != 0.0) ? r+b : r;
915 }
916 
917 static constexpr inline int32
918 SYSwrapmod(int32 a, int32 b)
919 {
920  if (b == 0)
921  return 0;
922  int32 r = a % b;
923  return ((a < 0) ^ (b < 0) && r) ? r+b : r;
924 }
925 
926 static constexpr inline int64
927 SYSwrapmod(int64 a, int64 b)
928 {
929  if (b == 0)
930  return 0;
931  int64 r = a % b;
932  return ((a < 0) ^ (b < 0) && r) ? r+b : r;
933 }
934 
935 static constexpr inline fpreal32
936 SYSsmooth(fpreal32 min, fpreal32 max, fpreal32 val)
937 {
938  if (val <= min) return 0;
939  if (val >= max) return 1;
940  fpreal32 t = max - min;
941  if (SYSequalZero(t, (fpreal32)1e-8)) return (fpreal32).5;
942  t = (val - min) / t;
943  return t*t*((fpreal32)3.0 - (fpreal32)2.0*t);
944 }
945 
946 static constexpr inline fpreal64
947 SYSsmooth(fpreal64 min, fpreal64 max, fpreal64 val)
948 {
949  if (val <= min) return 0;
950  if (val >= max) return 1;
951  fpreal64 t = max - min;
952  if (SYSequalZero(t, (fpreal64)1e-18)) return (fpreal64).5;
953  t = (val - min) / t;
954  return t*t*((fpreal64)3.0 - (fpreal64)2.0*t);
955 }
956 
957 static constexpr inline fpreal32
958 SYSsmooth(fpreal32 min, fpreal32 max, fpreal32 value, fpreal32 roll)
959 {
960  if (roll > 0)
961  {
962  fpreal32 f = SYSsmooth(min, max, value);
963  return roll < (fpreal32)1 ? (fpreal32)1-SYSpow((fpreal32)1-f,
964  (fpreal32)1/roll) : SYSpow(f, roll);
965  }
966  return (fpreal32)1;
967 }
968 
969 static constexpr inline fpreal64
970 SYSsmooth(fpreal64 min, fpreal64 max, fpreal64 value, fpreal64 roll)
971 {
972  if (roll > 0)
973  {
974  fpreal64 f = SYSsmooth(min, max, value);
975  return roll < (fpreal64)1 ? (fpreal64)1-SYSpow((fpreal64)1-f,
976  (fpreal64)1/roll) : SYSpow(f, roll);
977  }
978  return (fpreal64)1;
979 }
980 
981 static constexpr inline fpreal32
982 SYSfit(fpreal32 val, fpreal32 omin, fpreal32 omax, fpreal32 nmin, fpreal32 nmax)
983 {
984  fpreal32 d = omax - omin;
985  fpreal32 tmp = (d == 0) ? 0.5f * (nmin+nmax) : SYSlerp(nmin, nmax, (val-omin)/d);
986  return (d >= 0) ? (val < omin ? nmin : (val > omax ? nmax : tmp))
987  : (val < omax ? nmax : (val > omin ? nmin : tmp));
988 }
989 
990 static constexpr inline fpreal64
991 SYSfit(fpreal64 val, fpreal64 omin, fpreal64 omax, fpreal64 nmin, fpreal64 nmax)
992 {
993  fpreal64 d = omax - omin;
994  fpreal64 tmp = (d == 0) ? 0.5 * (nmin+nmax) : SYSlerp(nmin, nmax, (val-omin)/d);
995  return (d >= 0) ? (val < omin ? nmin : (val > omax ? nmax : tmp))
996  : (val < omax ? nmax : (val > omin ? nmin : tmp));
997 }
998 
999 /// SYSefit() will not clamp the values to the range
1000 static constexpr inline fpreal32
1001 SYSefit(fpreal32 v, fpreal32 omin, fpreal32 omax, fpreal32 nmin, fpreal32 nmax)
1002 {
1003  fpreal32 d = omax - omin;
1004  return (d == 0) ? 0.5f * (nmin+nmax) : SYSlerp(nmin, nmax, (v-omin)/d);
1005 }
1006 
1007 static constexpr inline fpreal64
1008 SYSefit(fpreal64 v, fpreal64 omin, fpreal64 omax, fpreal64 nmin, fpreal64 nmax)
1009 {
1010  fpreal64 d = omax - omin;
1011  return (d == 0) ? 0.5 * (nmin+nmax) : SYSlerp(nmin, nmax, (v-omin)/d);
1012 }
1013 
1014 static constexpr inline fpreal32
1015 SYSfit01(fpreal32 val, fpreal32 nmin, fpreal32 nmax)
1016 {
1017  if (val < 0) return nmin;
1018  if (val > 1) return nmax;
1019  return SYSlerp(nmin, nmax, val);
1020 }
1021 
1022 static constexpr inline fpreal64
1023 SYSfit01(fpreal64 val, fpreal64 nmin, fpreal64 nmax)
1024 {
1025  if (val < 0) return nmin;
1026  if (val > 1) return nmax;
1027  return SYSlerp(nmin, nmax, val);
1028 }
1029 
1030 /// SYSinvlerp() will produce the bias needed for lerp, but avoid
1031 /// zeros. Essentially built on efit.
1032 static constexpr inline fpreal32
1033 SYSinvlerp(fpreal32 v, fpreal32 omin, fpreal32 omax)
1034 {
1035  return SYSefit(v, omin, omax, 0.0f, 1.0f);
1036 }
1037 
1038 static constexpr inline fpreal64
1039 SYSinvlerp(fpreal64 v, fpreal64 omin, fpreal64 omax)
1040 {
1041  return SYSefit(v, omin, omax, 0.0, 1.0);
1042 }
1043 
1044 // Linear hat function over kernel width dx.
1045 static inline fpreal32
1046 SYShat(fpreal32 x, fpreal32 dx)
1047 {
1048  const fpreal32 ax = SYSabs(x);
1049  return (ax > dx ? 0 : 1 - ax / dx);
1050 }
1051 
1052 static inline fpreal64
1053 SYShat(fpreal64 x, fpreal64 dx)
1054 {
1055  const fpreal64 ax = SYSabs(x);
1056  return (ax > dx ? 0 : 1 - ax / dx);
1057 }
1058 
1059 // Derivative of the linear hat function over kernel width dx.
1060 static constexpr inline fpreal32
1061 SYSdhat(fpreal32 x, fpreal32 dx)
1062 {
1063  return (x < -dx || x > dx ? 0 : -SYSsgn(x) / dx);
1064 }
1065 
1066 static constexpr inline fpreal64
1067 SYSdhat(fpreal64 x, fpreal64 dx)
1068 {
1069  return (x < -dx || x > dx ? 0 : -SYSsgn(x) / dx);
1070 }
1071 
1072 
1073 // For integer types.
1074 template<typename T>
1075 constexpr inline T
1076 SYSroundDownToMultipleOf(T val, T multiple)
1077 {
1078  // Only handle multiples of 2 and up.
1079  if (multiple <= 1)
1080  return val;
1081 
1082  int rem = val % multiple;
1083  if (rem == 0)
1084  return val;
1085 
1086  if (val < 0)
1087  return val - multiple - rem;
1088  else
1089  return val - rem;
1090 }
1091 
1092 template<>
1093 inline fpreal32
1094 SYSroundDownToMultipleOf<fpreal32>(fpreal32 val, fpreal32 multiple)
1095 {
1096  if (SYSequalZero(multiple))
1097  return val;
1098  fpreal32 modulus = SYSfmod(val, multiple);
1099  if (SYSequalZero(modulus) || SYSequalZero(modulus-multiple))
1100  return val;
1101  fpreal32 retval = val - modulus;
1102  if( val < (fpreal32)0 && modulus!=(fpreal32)0 )
1103  retval -= multiple;
1104  return retval;
1105 }
1106 
1107 template<>
1108 inline fpreal64
1109 SYSroundDownToMultipleOf<fpreal64>(fpreal64 val, fpreal64 multiple)
1110 {
1111  if (SYSequalZero(multiple))
1112  return val;
1113  fpreal64 modulus = SYSfmod(val, multiple);
1114  if (SYSequalZero(modulus) || SYSequalZero(modulus-multiple))
1115  return val;
1116  fpreal64 retval = val - modulus;
1117  if( val < (fpreal64)0 && modulus!=(fpreal64)0 )
1118  retval -= multiple;
1119  return retval;
1120 }
1121 
1122 template<typename T>
1123 constexpr inline T
1124 SYSroundUpToMultipleOf(T val, T multiple)
1125 {
1126  // Only handle multiples of 2 and up.
1127  if (multiple <= 1)
1128  return val;
1129 
1130  int rem = val % multiple;
1131  if (rem == 0)
1132  return val;
1133 
1134  if (val < 0)
1135  return val - rem;
1136  else
1137  return val + multiple - rem;
1138 }
1139 
1140 template<>
1141 inline fpreal32
1142 SYSroundUpToMultipleOf<fpreal32>(fpreal32 val, fpreal32 multiple)
1143 {
1144  fpreal32 modulus;
1145  if (SYSequalZero(multiple))
1146  return val;
1147  modulus = SYSfmod(val, multiple);
1148  if (SYSequalZero(modulus) || SYSequalZero(modulus-multiple))
1149  return val;
1150  if (val > (fpreal32)0)
1151  val += multiple;
1152  return val - modulus;
1153 }
1154 
1155 template<>
1156 inline fpreal64
1157 SYSroundUpToMultipleOf<fpreal64>(fpreal64 val, fpreal64 multiple)
1158 {
1159  fpreal64 modulus;
1160  if (SYSequalZero(multiple))
1161  return val;
1162  modulus = SYSfmod(val, multiple);
1163  if (SYSequalZero(modulus) || SYSequalZero(modulus-multiple))
1164  return val;
1165  if (val > (fpreal64)0)
1166  val += multiple;
1167  return val - modulus;
1168 }
1169 
1170 inline constexpr uint32
1171 SYSroundUpPow2(uint32 val)
1172 {
1173  // From http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
1174  uint32 v = val;
1175 
1176  v--;
1177  v |= v >> 1;
1178  v |= v >> 2;
1179  v |= v >> 4;
1180  v |= v >> 8;
1181  v |= v >> 16;
1182  v++;
1183 
1184  return v;
1185 }
1186 
1187 static constexpr inline uint32
1188 SYSwang_inthash(uint32 key)
1189 {
1190  // From http://www.concentric.net/~Ttwang/tech/inthash.htm
1191  key += ~(key << 16);
1192  key ^= (key >> 5);
1193  key += (key << 3);
1194  key ^= (key >> 13);
1195  key += ~(key << 9);
1196  key ^= (key >> 17);
1197  return key;
1198 }
1199 
1200 
1201 static constexpr inline uint32
1202 SYSmultiplicative_inthash(uint32 key)
1203 {
1204  // Multiply by the golden mean of 2^32 (Knuth's multiplicative method) to
1205  // get a uniformly distributed hash value. Do a google search for
1206  // 2654435761 for more information.
1207  return key * 2654435761u;
1208 }
1209 
1210 static constexpr inline uint64
1211 SYSmultiplicative_inthash64(uint64 key)
1212 {
1213  // Same as the 32-bit version above, but using the golden mean of 2^64.
1214  return key * 11400714819323198485llu;
1215 }
1216 
1217 static constexpr inline uint64
1218 SYSwang_inthash64(uint64 key)
1219 {
1220  // From http://www.concentric.net/~Ttwang/tech/inthash.htm
1221  key += ~(key << 32ULL);
1222  key ^= (key >> 22);
1223  key += ~(key << 13);
1224  key ^= (key >> 8);
1225  key += (key << 3);
1226  key ^= (key >> 15);
1227  key += ~(key << 27);
1228  key ^= (key >> 31);
1229  return key;
1230 }
1231 
1232 static constexpr inline uint32
1233 SYSsharpe_inthash(uint32 key)
1234 {
1235  // Based on https://github.com/skeeto/hash-prospector, but with
1236  // modifications such that:
1237  // - bias value of 0.1406800449
1238  // - minimum cycle of 17 (the original algorithm had f(0) == 0)
1239  // - improved dieharder results
1240  key ^= (key >> 16);
1241  key *= 0xdbfb352dU;
1242  key ^= ~(key >> 15);
1243  key *= 0x6c2ca68bU;
1244  key ^= (key >> 16);
1245  return key;
1246 }
1247 
1248 static constexpr inline uint32
1249 SYSwang2_inthash(uint32 key)
1250 {
1251  // From http://www.concentric.net/~Ttwang/tech/inthash.htm
1252  // Updated integer hashing (2007)
1253  constexpr uint c2=0x27d4eb2d; // a prime or an odd constant
1254  key = (key ^ 61) ^ (key >> 16);
1255  key = key + (key << 3);
1256  key = key ^ (key >> 4);
1257  key = key * c2;
1258  key = key ^ (key >> 15);
1259  return key;
1260 }
1261 
1262 static constexpr inline uint64
1263 SYSwang2_inthash(uint64 key)
1264 {
1265  // From http://www.concentric.net/~Ttwang/tech/inthash.htm
1266  // Updated integer hashing (2007)
1267  key = (~key) + (key << 21); // key = (key<<21) - key - 1;
1268  key = key ^ (key >> 24);
1269  key = (key + (key << 3)) + (key << 8); // key * 265
1270  key = key ^ (key >> 14);
1271  key = (key + (key << 2)) + (key << 4); // key * 21
1272  key = key ^ (key >> 28);
1273  key = key + (key << 31);
1274  return key;
1275 }
1276 
1277 static inline uint
1278 SYSreal_hash(fpreal16 a, int lowmask=0x3)
1279 {
1280  return SYSwang_inthash(a.bits() & (~lowmask));
1281 }
1282 
1283 static inline uint
1284 SYSreal_hashseed(fpreal16 a, uint seed, int lowmask=0x3)
1285 {
1286  return SYSwang_inthash(seed + (a.bits() & (~lowmask)));
1287 }
1288 
1289 static inline uint
1290 SYSreal_hash(fpreal32 a, int lowmask=0xf)
1291 {
1292  SYS_FPRealUnionF ai;
1293  ai.fval = a;
1294  return SYSwang_inthash(ai.uval & (~lowmask));
1295 }
1296 
1297 static inline uint
1298 SYSreal_hashseed(fpreal32 a, uint seed, int lowmask=0xf)
1299 {
1300  SYS_FPRealUnionF ai;
1301  ai.fval = a;
1302  return SYSwang_inthash(seed + (ai.uval & (~lowmask)));
1303 }
1304 
1305 static inline uint
1306 SYSreal_hash(fpreal64 a, int lowmask=0xf)
1307 {
1308  SYS_FPRealUnionD ai;
1309  ai.fval = a;
1310  return SYSwang_inthash64(ai.uval & (~lowmask));
1311 }
1312 
1313 static inline uint
1314 SYSreal_hashseed(fpreal64 a, uint seed, int64 lowmask=0xf)
1315 {
1316  SYS_FPRealUnionD ai;
1317  ai.fval = a;
1318  return SYSwang_inthash64(seed + (ai.uval & (~lowmask)));
1319 }
1320 
1321 static constexpr inline uint
1322 SYSvector_hash(const int32 *vector, int size)
1323 {
1324  uint hash = 0;
1325  for (int i = 0; i < size; ++i)
1326  hash = SYSwang_inthash(hash + vector[i]);
1327  return hash;
1328 }
1329 
1330 static constexpr inline uint
1331 SYSvector_hash(const int64 *vector, int size)
1332 {
1333  uint hash = 0;
1334  for (int i = 0; i < size; ++i)
1335  hash = (uint)SYSwang_inthash64(hash + vector[i]);
1336  return hash;
1337 }
1338 
1339 static inline uint
1340 SYSvector_hash(const fpreal16 *vector, int size)
1341 {
1342  uint hash = 0;
1343  for (int i = 0; i < size; ++i)
1344  hash = SYSreal_hashseed(vector[i], hash);
1345  return hash;
1346 }
1347 
1348 static inline uint
1349 SYSvector_hash(const fpreal32 *vector, int size)
1350 {
1351  uint hash = 0;
1352  for (int i = 0; i < size; ++i)
1353  hash = SYSreal_hashseed(vector[i], hash);
1354  return hash;
1355 }
1356 
1357 static inline uint
1358 SYSvector_hash(const fpreal64 *vector, int size)
1359 {
1360  uint hash = 0;
1361  for (int i = 0; i < size; ++i)
1362  hash = SYSreal_hashseed(vector[i], hash);
1363  return hash;
1364 }
1365 
1366 // Spatial hashing function for 3-vectors
1367 // Reference:
1368 // "Optimized Spatial Hashing for Collision Detection of Deformable Objects"
1369 //
1370 template<class P>
1371 static inline size_t
1372 SYSvector3_hash(const P &vector)
1373 {
1374  static constexpr size_t p1 = 73856093;
1375  static constexpr size_t p2 = 19349663;
1376  static constexpr size_t p3 = 83492791;
1377 
1378  return size_t(vector.x()*p1) ^ size_t(vector.y()*p2) ^ size_t(vector.z()*p3);
1379 }
1380 
1381 static inline size_t
1382 SYSpointerHash(const void *ptr)
1383 {
1384  // Simple hash so there are random values in the lower 16 bits
1385  // We don't need a really sophisticated hash, just something to ensure the
1386  // bottom bits aren't all zero.
1387  uint64 v = (uint64)ptr;
1388  return v ^ (v >> 29);
1389 }
1390 
1391 // Convert a uniform random bit pattern to a random float in the range [0, 1)
1392 inline static fpreal32
1393 SYShashToFloat01(uint hash)
1394 {
1395  SYS_FPRealUnionF tmp;
1396  tmp.uval = 0x3f800000 | (0x007fffff & hash);
1397  return tmp.fval-1.0F;
1398 }
1399 
1400 // Generate a random number in range [0, 1)
1401 static inline fpreal32
1402 SYSfastRandom(uint &seed)
1403 {
1404  seed = seed*1664525 + 1013904223;
1405  return SYShashToFloat01(seed);
1406 }
1407 
1408 inline static fpreal32
1409 SYSrandom(uint &seed)
1410 {
1411  seed = seed*1664525 + 1013904223;
1412  return SYShashToFloat01(SYSwang_inthash(seed));
1413 }
1414 
1415 static constexpr uint
1416 SYSfastRandomInt(uint &seed)
1417 {
1418  seed = seed*1664525 + 1013904223;
1419  return SYSwang_inthash(seed);
1420 }
1421 
1422 inline static fpreal32
1423 SYSfastRandomZero(uint &seed)
1424 {
1425  return SYSfastRandom(seed) - 0.5F;
1426 }
1427 
1428 inline static fpreal32
1429 SYSrandomZero(uint &seed)
1430 {
1431  return SYSrandom(seed) - 0.5F;
1432 }
1433 
1434 template <typename T>
1435 static constexpr inline void
1436 SYSminmax(T v0, T v1, T v2, T v3, T &min, T &max)
1437 {
1438  min = SYSmin(v0, v1, v2, v3);
1439  max = SYSmax(v0, v1, v2, v3);
1440 }
1441 
1442 template <typename T>
1443 static constexpr inline void
1444 SYSminmax(T v0, T v1, T v2, T &min, T &max)
1445 {
1446  min = SYSmin(v0, v1, v2);
1447  max = SYSmax(v0, v1, v2);
1448 }
1449 
1450 template <typename T>
1451 static constexpr inline void
1452 SYSminmax(T v0, T v1, T &min, T &max)
1453 {
1454  min = SYSmin(v0, v1);
1455  max = SYSmax(v0, v1);
1456 }
1457 
1458 SYS_API void SYSsincosDeg(fpreal64 degrees, fpreal64 *s, fpreal64 *c);
1459 SYS_API void SYSsincosDeg(fpreal32 degrees, fpreal32 *s, fpreal32 *c);
1460 
1461 inline static void
1462 SYSgetSinCosFromSlope(fpreal32 slope, fpreal32 &sintheta, fpreal32 &costheta)
1463 {
1464  fpreal32 one_over_m;
1465  sintheta = slope / SYSsqrt(slope*slope + (fpreal32)1);
1466  if ((slope = SYSabs(slope)) > (fpreal32)1)
1467  {
1468  one_over_m = (fpreal32)1 / slope;
1469  costheta = one_over_m / SYSsqrt(one_over_m*one_over_m + 1);
1470  }
1471  else
1472  costheta = SYSsqrt((fpreal32)1 - sintheta*sintheta);
1473 }
1474 
1475 inline static void
1476 SYSgetSinCosFromSlope(fpreal64 slope, fpreal64 &sintheta, fpreal64 &costheta)
1477 {
1478  fpreal64 one_over_m;
1479  sintheta = slope / SYSsqrt(slope*slope + (fpreal64)1);
1480  if ((slope = SYSabs(slope)) > (fpreal64)1)
1481  {
1482  one_over_m = (fpreal64)1 / slope;
1483  costheta = one_over_m / SYSsqrt(one_over_m*one_over_m + 1);
1484  }
1485  else
1486  costheta = SYSsqrt((fpreal64)1 - sintheta*sintheta);
1487 }
1488 
1489 inline constexpr static bool
1490 SYSsameSign( fpreal32 v0, fpreal32 v1 )
1491 {
1492  return (v0*v1)>0;
1493 }
1494 
1495 inline constexpr static bool
1496 SYSsameSign( fpreal64 v0, fpreal64 v1 )
1497 {
1498  return (v0*v1)>0;
1499 }
1500 
1501 inline constexpr static bool
1502 SYSsameSign( int32 v0, int32 v1 )
1503 {
1504  return (v0 ^ v1) >= 0;
1505 }
1506 
1507 inline constexpr static bool
1508 SYSsameSign( int64 v0, int64 v1 )
1509 {
1510  return (v0 ^ v1) >= 0;
1511 }
1512 
1513 static inline uint
1514 SYSnextPrime(uint num)
1515 {
1516  return SYSmakePrime(num+1);
1517 }
1518 
1519 static constexpr inline int
1520 SYShexCharToInt(char c)
1521 {
1522  // Given a hexidecimal character, return it's corresponding value between
1523  // 0 and 15, or -1 if it's not a hexidecimal character.
1524  if (c >= '0' && c <= '9')
1525  return c - '0';
1526  if (c >= 'a' && c <= 'f')
1527  return c - 'a' + 10;
1528  if (c >= 'A' && c <= 'F')
1529  return c - 'A' + 10;
1530  return -1;
1531 }
1532 
1533 static constexpr inline char
1534 SYSintToHexChar(int value)
1535 {
1536  // The value must be from 0-15 for this function to return a valid result.
1537  return value < 10 ? '0' + value : 'a' + value - 10;
1538 }
1539 
1540 SYS_API void SYSsort(int &a, int &b);
1541 SYS_API void SYSsort(int &a, int &b, int &c);
1542 SYS_API void SYSsort(int64 &a, int64 &b);
1543 SYS_API void SYSsort(int64 &a, int64 &b, int64 &c);
1544 SYS_API void SYSsort(float &a, float &b);
1545 SYS_API void SYSsort(float &a, float &b, float &c);
1546 SYS_API void SYSsort(double &a, double &b);
1547 SYS_API void SYSsort(double &a, double &b, double &c);
1548 
1549 // Compute both integer division and integer modulus
1550 // They are compiled into a single instruction
1551 static constexpr inline void
1552 SYSdivMod(int numerator, int denominator, int &quotient, int &remainder)
1553 {
1554  quotient = numerator / denominator;
1555  remainder = numerator % denominator;
1556 }
1557 
1558 static constexpr inline void
1559 SYSdivMod(int64 numerator, int64 denominator, int64 &quotient, int64 &remainder)
1560 {
1561  quotient = numerator / denominator;
1562  remainder = numerator % denominator;
1563 }
1564 
1565 // Include permutations of fpreal32/fpreal64
1566 #include "SYS_MathPermute.h"
1567 #include "SYS_MathRestrictive.h"
1568 
1569 #else /* cplusplus */
1570 #define SYSmax(a,b) ((a) > (b) ? (a) : (b))
1571 #define SYSmin(a,b) ((a) < (b) ? (a) : (b))
1572 #define SYSabs(a) ((a) < 0 ? (a) : -(a))
1573 #endif
1574 
1575 #endif
SYSisNormal
bool SYSisNormal(fpreal64 f)
Definition: SYS_Math.h:219
SYS_FastMath::acosf
SYS_API float acosf(float x)
SYSmax
#define SYSmax(a, b)
Definition: SYS_Math.h:1570
SYS_FastMath::cos
SYS_API double cos(double x)
Definition: SYS_FPUMath.h:69
int
typedef int(APIENTRYP RE_PFNGLXSWAPINTERVALSGIPROC)(int)
uint16
unsigned short uint16
Definition: SYS_Types.h:38
SYS_FastMath::fmod
SYS_API double fmod(double x, double y)
Definition: SYS_FPUMath.h:85
SYS_FastMath::atan2
SYS_API double atan2(double y, double x)
Definition: SYS_FPUMath.h:79
SYSrecip
UT_Vector3T< T > SYSrecip(const UT_Vector3T< T > &v)
Definition: UT_Vector3.h:1083
SYS_FastMath::expm1
SYS_API double expm1(double x)
Definition: SYS_FPUMath.h:95
int32
int int32
Definition: SYS_Types.h:39
SYS_FPRealUnionT< fpreal64 >::fval
fpreal_type fval
Definition: SYS_Types.h:410
v
const GLdouble * v
Definition: glcorearb.h:837
SYS_FPRealUnionT< fpreal32 >::uval
uint_type uval
Definition: SYS_Types.h:385
M_PI
#define M_PI
Definition: fmath.h:90
SYSsrand48
SYS_API void SYSsrand48(long seed)
SYSisFinite
bool SYSisFinite(fpreal64 f)
Definition: SYS_Math.h:201
SYSisInf
bool SYSisInf(fpreal64 f)
Definition: SYS_Math.h:210
CONST_INT64
#define CONST_INT64(x)
Definition: SYS_Types.h:320
SYSisInteger
bool SYSisInteger(const UT_Vector2T< T > &v1)
Componentwise integer test.
Definition: UT_Vector2.h:93
simd::sqrt
vfloat4 sqrt(const vfloat4 &a)
Definition: simd.h:7481
sincos
OIIO_HOSTDEVICE void sincos(float x, float *sine, float *cosine)
Definition: fmath.h:703
SYSisNan
constexpr bool SYSisNan(const F f)
Definition: SYS_Math.h:184
a
GLboolean GLboolean GLboolean GLboolean a
Definition: glcorearb.h:1222
s
GLdouble s
Definition: glad.h:3009
SYSabs
#define SYSabs(a)
Definition: SYS_Math.h:1572
SYS_FastMath::atan2f
SYS_API float atan2f(float y, float x)
ImageBufAlgo::min
ImageBuf OIIO_API min(Image_or_Const A, Image_or_Const B, ROI roi={}, int nthreads=0)
SYSbilerp
UT_Matrix2T< T > SYSbilerp(const UT_Matrix2T< T > &u0v0, const UT_Matrix2T< T > &u1v0, const UT_Matrix2T< T > &u0v1, const UT_Matrix2T< T > &u1v1, S u, S v)
Bilinear interpolation.
Definition: UT_Matrix2.h:72
y
GLint y
Definition: glcorearb.h:103
SYS_FPRealUnionT< fpreal64 >
Definition: SYS_Types.h:397
result
**But if you need a result
Definition: thread.h:613
SYS_FTOLERANCE_D
#define SYS_FTOLERANCE_D
Definition: SYS_Types.h:209
v2
GLfloat GLfloat GLfloat v2
Definition: glcorearb.h:818
SYSlerp
UT_Matrix2T< T > SYSlerp(const UT_Matrix2T< T > &v1, const UT_Matrix2T< T > &v2, S t)
Definition: UT_Matrix2.h:675
uint64
unsigned long long uint64
Definition: SYS_Types.h:117
v3
GLfloat GLfloat GLfloat GLfloat v3
Definition: glcorearb.h:819
SYS_FastMath::log10
SYS_API double log10(double x)
Definition: SYS_FPUMath.h:89
SYSbarycentric
UT_Matrix2T< T > SYSbarycentric(const UT_Matrix2T< T > &v0, const UT_Matrix2T< T > &v1, const UT_Matrix2T< T > &v2, S u, S v)
Barycentric interpolation.
Definition: UT_Matrix2.h:79
fpreal32
float fpreal32
Definition: SYS_Types.h:200
SYS_FPRealUnionT< fpreal64 >::uval
uint_type uval
Definition: SYS_Types.h:409
SYS_FastMath::log10f
SYS_API float log10f(float x)
SYS_Floor.h
fpreal64
double fpreal64
Definition: SYS_Types.h:201
ImageBufAlgo::pow
ImageBuf OIIO_API pow(const ImageBuf &A, cspan< float > B, ROI roi={}, int nthreads=0)
uint8
unsigned char uint8
Definition: SYS_Types.h:36
SYS_FastMath.h
SYS_Types.h
f
GLfloat f
Definition: glcorearb.h:1926
SYS_FastMath::asin
SYS_API double asin(double x)
Definition: SYS_FPUMath.h:81
trunc
IMATH_HOSTDEVICE constexpr int trunc(T x) IMATH_NOEXCEPT
Definition: ImathFun.h:126
SYS_FastMath::sinh
SYS_API double sinh(double x)
SYS_FastMath::copysign
SYS_API double copysign(double x, double y)
SYS_FastMath::atanf
SYS_API float atanf(float x)
SYSroundAngle
SYS_API fpreal32 SYSroundAngle(fpreal32 base, fpreal32 source)
SYSclamp
UT_Vector3T< T > SYSclamp(const UT_Vector3T< T > &v, const UT_Vector3T< T > &min, const UT_Vector3T< T > &max)
Definition: UT_Vector3.h:1057
source
GLsizei GLsizei GLchar * source
Definition: glcorearb.h:803
SYS_FastMath::cosh
SYS_API double cosh(double x)
SYSisPrime
SYS_API bool SYSisPrime(uint num)
SYS_FastMath::sincosf
SYS_API void sincosf(float x, float *s, float *c)
SYSsignum
constexpr int SYSsignum(const F a) noexcept
Definition: SYS_Math.h:176
fpreal16::isFinite
bool isFinite() const
Definition: fpreal16.h:633
int64
long long int64
Definition: SYS_Types.h:116
SYSdrand48
SYS_API double SYSdrand48()
SYSfloor
SYS_API fpreal32 SYSfloor(fpreal32 val)
SYSinvlerp
UT_Vector2T< T > SYSinvlerp(const UT_Vector2T< T > &a, const UT_Vector2T< T > &v1, const UT_Vector2T< T > &v2)
Componentwise inverse linear interpolation.
Definition: UT_Vector2.h:690
SYS_FastMath::logf
SYS_API float logf(float x)
SYS_FastMath::acos
SYS_API double acos(double x)
Definition: SYS_FPUMath.h:83
int8
signed char int8
Definition: SYS_Types.h:35
SYSisInt
SYS_API bool SYSisInt(const char *str)
SYS_FastMath::hypot
SYS_API double hypot(double x, double y)
b
GLboolean GLboolean GLboolean b
Definition: glcorearb.h:1222
x
GLint GLenum GLint x
Definition: glcorearb.h:409
OBJ_MatchTransform::T
fpreal16::isInfinity
bool isInfinity() const
Definition: fpreal16.h:674
SYSrint
fpreal32 SYSrint(fpreal32 val)
Definition: SYS_Floor.h:163
t
GLdouble t
Definition: glad.h:2397
SYS_FastMath::log1p
SYS_API double log1p(double x)
Definition: SYS_FPUMath.h:93
v0
GLfloat v0
Definition: glcorearb.h:816
SYS_FastMath::tanh
SYS_API double tanh(double x)
Definition: SYS_FPUMath.h:103
SYSequalZero
bool SYSequalZero(const UT_Vector3T< T > &v)
Definition: UT_Vector3.h:1069
SYSmakePrime
SYS_API uint SYSmakePrime(uint num)
size
GLsizeiptr size
Definition: glcorearb.h:664
SYS_FastMath::tan
SYS_API double tan(double x)
Definition: SYS_FPUMath.h:75
int16
short int16
Definition: SYS_Types.h:37
SYS_FastMath::atan
SYS_API double atan(double x)
Definition: SYS_FPUMath.h:77
v1
GLfloat GLfloat v1
Definition: glcorearb.h:817
ptr
auto ptr(T p) -> const void *
Definition: format.h:2448
val
GLuint GLfloat * val
Definition: glcorearb.h:1608
ImageBufAlgo::max
ImageBuf OIIO_API max(Image_or_Const A, Image_or_Const B, ROI roi={}, int nthreads=0)
SYS_Types
Definition: SYS_Types.h:225
fpreal16::isNan
bool isNan() const
Definition: fpreal16.h:665
uint32
unsigned int uint32
Definition: SYS_Types.h:40
SYS_FastMath::asinf
SYS_API float asinf(float x)
SYS_FTOLERANCE
#define SYS_FTOLERANCE
Definition: SYS_Types.h:208
SYS_API
#define SYS_API
Definition: SYS_API.h:11
value
Definition: core.h:1131
CONST_UINT64
#define CONST_UINT64(x)
Definition: SYS_Types.h:321
SYS_MathPermute.h
SYS_FPRealUnionT< fpreal32 >::fval
fpreal_type fval
Definition: SYS_Types.h:386
SYS_API.h
r
GLboolean r
Definition: glcorearb.h:1222
SYS_FPRealUnionT< fpreal32 >
Definition: SYS_Types.h:368
fpreal16::bits
unsigned short bits() const
Definition: fpreal16.h:726
SYS_MathRestrictive.h
simd::log
OIIO_FORCEINLINE T log(const T &v)
Definition: simd.h:7688
SYSisEqual
bool SYSisEqual(const UT_Vector2T< T > &a, const UT_Vector2T< T > &b, S tol=SYS_FTOLERANCE)
Componentwise equality.
Definition: UT_Vector2.h:674
SYSmin
#define SYSmin(a, b)
Definition: SYS_Math.h:1571
SYSisFloat
SYS_API bool SYSisFloat(const char *str)
uint
unsigned int uint
Definition: SYS_Types.h:45
SYS_FastMath::sin
SYS_API double sin(double x)
Definition: SYS_FPUMath.h:71
SYSceil
SYS_API fpreal32 SYSceil(fpreal32 val)
fpreal16::isNormalized
bool isNormalized() const
Definition: fpreal16.h:641
degrees
OIIO_FORCEINLINE OIIO_HOSTDEVICE T degrees(T rad)
Convert radians to degrees.
Definition: fmath.h:673