mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-11-07 21:41:25 +00:00
144 lines
3.2 KiB
C
144 lines
3.2 KiB
C
// "Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman
|
|
// Ken Silverman's official web site: "http://www.advsys.net/ken"
|
|
// See the included license file "BUILDLIC.TXT" for license info.
|
|
//
|
|
// This file is based on pragmas.h from Ken Silverman's original Build
|
|
// source code release and contains routines that were originally
|
|
// inline assembly but are not now.
|
|
|
|
#ifndef __M_FIXED__
|
|
#define __M_FIXED__
|
|
|
|
#include <stdlib.h>
|
|
#include "doomtype.h"
|
|
|
|
#if defined(__GNUC__) && defined(__i386__)
|
|
#include "gccinlines.h"
|
|
#elif defined(_MSC_VER) && defined(_M_IX86)
|
|
#include "mscinlines.h"
|
|
#else
|
|
#include "basicinlines.h"
|
|
#endif
|
|
|
|
#include "xs_Float.h"
|
|
|
|
#define MAKESAFEDIVSCALE(x) \
|
|
inline SDWORD SafeDivScale##x (SDWORD a, SDWORD b) \
|
|
{ \
|
|
if ((DWORD)abs(a) >> (31-x) >= (DWORD)abs (b)) \
|
|
return (a^b)<0 ? FIXED_MIN : FIXED_MAX; \
|
|
return DivScale##x (a, b); \
|
|
}
|
|
|
|
MAKESAFEDIVSCALE(1)
|
|
MAKESAFEDIVSCALE(2)
|
|
MAKESAFEDIVSCALE(3)
|
|
MAKESAFEDIVSCALE(4)
|
|
MAKESAFEDIVSCALE(5)
|
|
MAKESAFEDIVSCALE(6)
|
|
MAKESAFEDIVSCALE(7)
|
|
MAKESAFEDIVSCALE(8)
|
|
MAKESAFEDIVSCALE(9)
|
|
MAKESAFEDIVSCALE(10)
|
|
MAKESAFEDIVSCALE(11)
|
|
MAKESAFEDIVSCALE(12)
|
|
MAKESAFEDIVSCALE(13)
|
|
MAKESAFEDIVSCALE(14)
|
|
MAKESAFEDIVSCALE(15)
|
|
MAKESAFEDIVSCALE(16)
|
|
MAKESAFEDIVSCALE(17)
|
|
MAKESAFEDIVSCALE(18)
|
|
MAKESAFEDIVSCALE(19)
|
|
MAKESAFEDIVSCALE(20)
|
|
MAKESAFEDIVSCALE(21)
|
|
MAKESAFEDIVSCALE(22)
|
|
MAKESAFEDIVSCALE(23)
|
|
MAKESAFEDIVSCALE(24)
|
|
MAKESAFEDIVSCALE(25)
|
|
MAKESAFEDIVSCALE(26)
|
|
MAKESAFEDIVSCALE(27)
|
|
MAKESAFEDIVSCALE(28)
|
|
MAKESAFEDIVSCALE(29)
|
|
MAKESAFEDIVSCALE(30)
|
|
#undef MAKESAFEDIVSCALE
|
|
|
|
inline SDWORD SafeDivScale31 (SDWORD a, SDWORD b)
|
|
{
|
|
if ((DWORD)abs(a) >= (DWORD)abs (b))
|
|
return (a^b)<0 ? FIXED_MIN : FIXED_MAX;
|
|
return DivScale31 (a, b);
|
|
}
|
|
|
|
inline SDWORD SafeDivScale32 (SDWORD a, SDWORD b)
|
|
{
|
|
if ((DWORD)abs(a) >= (DWORD)abs (b) >> 1)
|
|
return (a^b)<0 ? FIXED_MIN : FIXED_MAX;
|
|
return DivScale32 (a, b);
|
|
}
|
|
|
|
#define FixedMul MulScale16
|
|
#define FixedDiv SafeDivScale16
|
|
|
|
inline void qinterpolatedown16 (SDWORD *out, DWORD count, SDWORD val, SDWORD delta)
|
|
{
|
|
if (count & 1)
|
|
{
|
|
out[0] = val >> 16;
|
|
val += delta;
|
|
}
|
|
count >>= 1;
|
|
while (count-- != 0)
|
|
{
|
|
int temp = val + delta;
|
|
out[0] = val >> 16;
|
|
val = temp + delta;
|
|
out[1] = temp >> 16;
|
|
out += 2;
|
|
}
|
|
}
|
|
|
|
inline void qinterpolatedown16short (short *out, DWORD count, SDWORD val, SDWORD delta)
|
|
{
|
|
if (count)
|
|
{
|
|
if ((size_t)out & 2)
|
|
{ // align to dword boundary
|
|
*out++ = (short)(val >> 16);
|
|
count--;
|
|
val += delta;
|
|
}
|
|
DWORD *o2 = (DWORD *)out;
|
|
DWORD c2 = count>>1;
|
|
while (c2-- != 0)
|
|
{
|
|
SDWORD temp = val + delta;
|
|
*o2++ = (temp & 0xffff0000) | ((DWORD)val >> 16);
|
|
val = temp + delta;
|
|
}
|
|
if (count & 1)
|
|
{
|
|
*(short *)o2 = (short)(val >> 16);
|
|
}
|
|
}
|
|
}
|
|
|
|
//returns num/den, dmval = num%den
|
|
inline SDWORD DivMod (SDWORD num, SDWORD den, SDWORD *dmval)
|
|
{
|
|
*dmval = num % den;
|
|
return num / den;
|
|
}
|
|
|
|
//returns num%den, dmval = num/den
|
|
inline SDWORD ModDiv (SDWORD num, SDWORD den, SDWORD *dmval)
|
|
{
|
|
*dmval = num / den;
|
|
return num % den;
|
|
}
|
|
|
|
|
|
#define FLOAT2FIXED(f) xs_Fix<16>::ToFix(f)
|
|
#define FIXED2FLOAT(f) ((f) / float(65536))
|
|
#define FIXED2DBL(f) ((f) / double(65536))
|
|
|
|
#endif
|