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64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
// "Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman
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// Ken Silverman's official web site: "http://www.advsys.net/ken"
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// See the included license file "BUILDLIC.TXT" for license info.
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//
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// This file has been modified from Ken Silverman's original release
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// by Jonathon Fowler (jf@jonof.id.au)
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// by the EDuke32 team (development@voidpoint.com)
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#include "templates.h"
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#ifndef pragmas_h_
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#define pragmas_h_
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extern int32_t reciptable[2048];
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// break the C version of divscale out from the others
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// because asm version overflows in drawmapview()
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#define qw(x) ((int64_t)(x)) // quadword cast
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#define dw(x) ((int32_t)(x)) // doubleword cast
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#define wo(x) ((int16_t)(x)) // word cast
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#define by(x) ((uint8_t)(x)) // byte cast
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#define DIVTABLESIZE 16384
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static inline int32_t divscale(int32_t eax, int32_t ebx, int32_t ecx) { return (int64_t(eax) << ecx) / ebx; }
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static inline double fdivscale(double eax, double ebx, int32_t ecx) { return (eax * (double)(qw(1) << ecx)) / ebx; }
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static inline int32_t scale(int32_t eax, int32_t edx, int32_t ecx)
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{
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return int64_t(eax) * edx / ecx;
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}
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#define klabs(x) abs(x)
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static inline constexpr int ksgn(int32_t a) { return (a > 0) - (a < 0); }
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inline int sgn(int32_t a) { return (a > 0) - (a < 0); }
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static inline int32_t mulscale(int32_t eax, int32_t edx, int32_t ecx) { return dw((qw(eax) * edx) >> by(ecx)); }
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static inline double fmulscale(double eax, double edx, int32_t ecx) { return (eax * edx) / (double)(qw(1) << ecx); }
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static inline int32_t dmulscale(int32_t eax, int32_t edx, int32_t esi, int32_t edi, int32_t ecx)
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{
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return dw(((qw(eax) * edx) + (qw(esi) * edi)) >> by(ecx));
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}
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static inline double fdmulscale(double eax, double edx, double esi, double edi, int32_t ecx)
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{
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return ((eax * edx) + (esi * edi)) / (double)(qw(1) << ecx);
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}
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static inline int32_t krecipasm(int32_t i)
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{
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// Ken did this
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union { int32_t i; float f; } x;
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x.f = (float)i;
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i = x.i;
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return ((reciptable[(i >> 12) & 2047] >> (((i - 0x3f800000) >> 23) & 31)) ^ (i >> 31));
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}
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#undef qw
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#undef dw
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#undef wo
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#undef by
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#endif // pragmas_h_
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