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- // VirtualDub - Video processing and capture application
- // System library component
- // Copyright (C) 1998-2004 Avery Lee, All Rights Reserved.
- //
- // Beginning with 1.6.0, the VirtualDub system library is licensed
- // differently than the remainder of VirtualDub. This particular file is
- // thus licensed as follows (the "zlib" license):
- //
- // This software is provided 'as-is', without any express or implied
- // warranty. In no event will the authors be held liable for any
- // damages arising from the use of this software.
- //
- // Permission is granted to anyone to use this software for any purpose,
- // including commercial applications, and to alter it and redistribute it
- // freely, subject to the following restrictions:
- //
- // 1. The origin of this software must not be misrepresented; you must
- // not claim that you wrote the original software. If you use this
- // software in a product, an acknowledgment in the product
- // documentation would be appreciated but is not required.
- // 2. Altered source versions must be plainly marked as such, and must
- // not be misrepresented as being the original software.
- // 3. This notice may not be removed or altered from any source
- // distribution.
-
- #ifndef f_VD2_SYSTEM_MATH_H
- #define f_VD2_SYSTEM_MATH_H
-
- #include <math.h>
- #include <vd2/system/vdtypes.h>
-
- // Constants
- namespace nsVDMath {
- static const float kfPi = 3.1415926535897932384626433832795f;
- static const double krPi = 3.1415926535897932384626433832795;
- static const float kfTwoPi = 6.283185307179586476925286766559f;
- static const double krTwoPi = 6.283185307179586476925286766559;
- static const float kfLn2 = 0.69314718055994530941723212145818f;
- static const double krLn2 = 0.69314718055994530941723212145818;
- static const float kfLn10 = 2.3025850929940456840179914546844f;
- static const double krLn10 = 2.3025850929940456840179914546844;
- static const float kfOneOverLn10 = 0.43429448190325182765112891891661f;
- static const double krOneOverLn10 = 0.43429448190325182765112891891661;
- };
-
- ///////////////////////////////////////////////////////////////////////////
- // Integer clamping functions
- //
- #ifdef _M_IX86
- inline uint32 VDClampToUint32(sint64 v) {
- union U {
- __int64 v64;
- struct {
- unsigned lo;
- int hi;
- } v32;
- };
-
- return ((U *)&v)->v32.hi ? ~(((U *)&v)->v32.hi >> 31) : ((U *)&v)->v32.lo;
- }
- #else
- inline uint32 VDClampToUint32(sint64 v) {
- uint32 r = (uint32)v;
- return r == v ? r : (uint32)~(sint32)(v>>63);
- }
- #endif
-
- inline sint32 VDClampToSint32(uint32 v) {
- return (v | ((sint32)v >> 31)) & 0x7FFFFFFF;
- }
-
- inline sint32 VDClampToSint32(sint64 v) {
- sint32 r = (sint32)v;
- return r == v ? r : (sint32)(v >> 63) ^ 0x7FFFFFFF;
- }
-
- inline uint16 VDClampToUint16(uint32 v) {
- if (v > 0xffff)
- v = 0xffff;
- return (uint16)v;
- }
-
- ///////////////////////////////////////////////////////////////////////////
- // Absolute value functions
- inline sint64 VDAbs64(sint64 v) {
- return v<0 ? -v : v;
- }
-
- inline ptrdiff_t VDAbsPtrdiff(ptrdiff_t v) {
- return v<0 ? -v : v;
- }
-
- // Rounding functions
- //
- // Round a double to an int or a long. Behavior is not specified at
- // int(y)+0.5, if x is NaN or Inf, or if x is out of range.
-
- int VDRoundToInt(double x);
- long VDRoundToLong(double x);
- sint32 VDRoundToInt32(double x);
- sint64 VDRoundToInt64(double x);
-
- inline sint32 VDRoundToIntFast(float x) {
- union {
- float f;
- sint32 i;
- } u = {x + 12582912.0f}; // 2^22+2^23
-
- return (sint32)u.i - 0x4B400000;
- }
-
- inline sint32 VDRoundToIntFastFullRange(double x) {
- union {
- double f;
- sint32 i[2];
- } u = {x + 6755399441055744.0f}; // 2^51+2^52
-
- return (sint32)u.i[0];
- }
-
- #ifdef _M_AMD64
- inline sint32 VDFloorToInt(double x) {
- return (sint32)floor(x);
- }
-
- inline sint64 VDFloorToInt64(double x) {
- return (sint64)floor(x);
- }
- #else
- #pragma warning(push)
- #pragma warning(disable: 4035) // warning C4035: 'VDFloorToInt' : no return value
- inline sint32 VDFloorToInt(double x) {
- sint32 temp;
-
- __asm {
- fld x
- fist temp
- fild temp
- mov eax, temp
- fsub
- fstp temp
- cmp temp, 80000001h
- adc eax, -1
- }
- }
- inline sint64 VDFloorToInt64(double x) {
- sint64 temp;
- sint32 temp2;
-
- __asm {
- fld x
- fld st(0)
- fistp qword ptr temp
- fild qword ptr temp
- mov eax, dword ptr temp
- mov edx, dword ptr temp+4
- fsub
- fstp dword ptr temp2
- cmp dword ptr temp2, 80000001h
- adc eax, -1
- adc edx, -1
- }
- }
- #pragma warning(pop)
- #endif
-
- #ifdef _M_AMD64
- inline sint32 VDCeilToInt(double x) {
- return (sint32)ceil(x);
- }
-
- inline sint64 VDCeilToInt64(double x) {
- return (sint64)ceil(x);
- }
- #else
- #pragma warning(push)
- #pragma warning(disable: 4035) // warning C4035: 'VDCeilToInt' : no return value
- inline sint32 VDCeilToInt(double x) {
- sint32 temp;
-
- __asm {
- fld x
- fist temp
- fild temp
- mov eax, temp
- fsubr
- fstp temp
- cmp temp, 80000001h
- sbb eax, -1
- }
- }
-
- inline sint32 VDCeilToInt64(double x) {
- sint64 temp;
- sint32 temp2;
-
- __asm {
- fld x
- fld st(0)
- fistp temp
- fild temp
- mov eax, dword ptr temp
- mov edx, dword ptr temp+4
- fsubr
- fstp temp2
- cmp temp2, 80000001h
- sbb eax, -1
- sbb edx, -1
- }
- }
- #pragma warning(pop)
- #endif
-
- ///////////////////////////////////////////////////////////////////////////
- inline sint16 VDClampedRoundFixedToInt16Fast(float x) {
- union {
- float f;
- sint32 i;
- } u = {x + 384.0f}; // 2^7+2^8
-
- sint32 v = (sint32)u.i - 0x43BF8000;
-
- if ((uint32)v >= 0x10000)
- v = ~v >> 31;
-
- return (sint16)(v - 0x8000);
- }
-
- inline uint8 VDClampedRoundFixedToUint8Fast(float x) {
- union {
- float f;
- sint32 i;
- } u = {x * 255.0f + 12582912.0f}; // 2^22+2^23
-
- sint32 v = (sint32)u.i - 0x4B400000;
-
- if ((uint32)v >= 0xFF)
- v = ~v >> 31;
-
- return (uint8)v;
- }
-
- ///////////////////////////////////////////////////////////////////////////
-
- #ifdef _M_IX86
- sint64 __stdcall VDFractionScale64(uint64 a, uint32 b, uint32 c, uint32& remainder);
- uint64 __stdcall VDUMulDiv64x32(uint64 a, uint32 b, uint32 c);
- #else
- extern "C" sint64 VDFractionScale64(uint64 a, uint64 b, uint64 c, uint32& remainder);
- extern "C" uint64 VDUMulDiv64x32(uint64 a, uint32 b, uint32 c);
- #endif
-
- sint64 VDMulDiv64(sint64 a, sint64 b, sint64 c);
-
- ///////////////////////////////////////////////////////////////////////////
-
- bool VDVerifyFiniteFloats(const float *p, uint32 n);
-
- #endif
-