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https://github.com/ZDoom/gzdoom-gles.git
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7160e09b04
if the view is near the bounds of the fixed point coordinate system. This happens because it rotates the view position around (0,0) according to the current viewangle, so the resultant coordinate may be outside the bounds of fixed point. All important math in this function is now done entirely in floating point. - Fixed: Slopes didn't draw right on 64-bit platforms. SVN r986 (trunk)
360 lines
7.7 KiB
C
360 lines
7.7 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 is based on pragmas.h from Ken Silverman's original Build
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// source code release but is meant for use with Visual C++ instead of
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// Watcom C.
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//
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// Some of the inline assembly has been turned into C code, because VC++
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// is smart enough to produce code at least as good as Ken's inlines.
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// The more used functions are still inline assembly, because they do
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// things that can't really be done in C. (I consider this a bad thing,
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// because VC++ has considerably poorer support for inline assembly than
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// Watcom, so it's better to rely on its C optimizer to produce fast code.)
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//
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#include <string.h>
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#include <stddef.h>
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#pragma warning (disable: 4035)
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__forceinline SDWORD Scale (SDWORD a, SDWORD b, SDWORD c)
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{
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__asm mov eax,a
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__asm imul b
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__asm idiv c
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}
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__forceinline SDWORD MulScale (SDWORD a, SDWORD b, SDWORD c)
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{
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__asm mov eax,a
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__asm mov ecx,c
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__asm imul b
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__asm shrd eax,edx,cl
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}
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#define MAKECONSTMulScale(s) \
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__forceinline SDWORD MulScale##s (SDWORD a, SDWORD b) \
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{ \
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__asm mov eax,a \
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__asm imul b \
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__asm shrd eax,edx,s \
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}
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MAKECONSTMulScale(1)
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MAKECONSTMulScale(2)
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MAKECONSTMulScale(3)
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MAKECONSTMulScale(4)
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MAKECONSTMulScale(5)
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MAKECONSTMulScale(6)
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MAKECONSTMulScale(7)
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MAKECONSTMulScale(8)
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MAKECONSTMulScale(9)
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MAKECONSTMulScale(10)
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MAKECONSTMulScale(11)
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MAKECONSTMulScale(12)
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MAKECONSTMulScale(13)
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MAKECONSTMulScale(14)
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MAKECONSTMulScale(15)
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MAKECONSTMulScale(16)
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MAKECONSTMulScale(17)
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MAKECONSTMulScale(18)
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MAKECONSTMulScale(19)
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MAKECONSTMulScale(20)
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MAKECONSTMulScale(21)
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MAKECONSTMulScale(22)
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MAKECONSTMulScale(23)
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MAKECONSTMulScale(24)
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MAKECONSTMulScale(25)
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MAKECONSTMulScale(26)
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MAKECONSTMulScale(27)
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MAKECONSTMulScale(28)
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MAKECONSTMulScale(29)
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MAKECONSTMulScale(30)
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MAKECONSTMulScale(31)
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#undef MAKECONSTMulScale
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__forceinline SDWORD MulScale32 (SDWORD a, SDWORD b)
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{
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__asm mov eax,a
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__asm imul b
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__asm mov eax,edx
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}
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__forceinline SDWORD DMulScale (SDWORD a, SDWORD b, SDWORD c, SDWORD d, SDWORD s)
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{
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__asm mov eax,a
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__asm imul b
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__asm mov ebx,eax
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__asm mov eax,c
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__asm mov esi,edx
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__asm mov ecx,s
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__asm imul d
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__asm add eax,ebx
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__asm adc edx,esi
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__asm shrd eax,edx,cl
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}
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#define MAKECONSTDMulScale(s) \
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__forceinline SDWORD DMulScale##s (SDWORD a, SDWORD b, SDWORD c, SDWORD d) \
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{ \
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__asm mov eax,a \
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__asm imul b \
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__asm mov ebx,eax \
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__asm mov eax,c \
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__asm mov esi,edx \
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__asm imul d \
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__asm add eax,ebx \
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__asm adc edx,esi \
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__asm shrd eax,edx,s \
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}
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MAKECONSTDMulScale(1)
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MAKECONSTDMulScale(2)
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MAKECONSTDMulScale(3)
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MAKECONSTDMulScale(4)
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MAKECONSTDMulScale(5)
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MAKECONSTDMulScale(6)
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MAKECONSTDMulScale(7)
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MAKECONSTDMulScale(8)
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MAKECONSTDMulScale(9)
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MAKECONSTDMulScale(10)
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MAKECONSTDMulScale(11)
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MAKECONSTDMulScale(12)
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MAKECONSTDMulScale(13)
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MAKECONSTDMulScale(14)
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MAKECONSTDMulScale(15)
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MAKECONSTDMulScale(16)
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MAKECONSTDMulScale(17)
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MAKECONSTDMulScale(18)
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MAKECONSTDMulScale(19)
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MAKECONSTDMulScale(20)
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MAKECONSTDMulScale(21)
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MAKECONSTDMulScale(22)
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MAKECONSTDMulScale(23)
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MAKECONSTDMulScale(24)
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MAKECONSTDMulScale(25)
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MAKECONSTDMulScale(26)
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MAKECONSTDMulScale(27)
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MAKECONSTDMulScale(28)
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MAKECONSTDMulScale(29)
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MAKECONSTDMulScale(30)
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MAKECONSTDMulScale(31)
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#undef MAKCONSTDMulScale
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__forceinline SDWORD DMulScale32 (SDWORD a, SDWORD b, SDWORD c, SDWORD d)
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{
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__asm mov eax,a
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__asm imul b
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__asm mov ebx,eax
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__asm mov eax,c
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__asm mov esi,edx
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__asm imul d
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__asm add eax,ebx
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__asm adc edx,esi
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__asm mov eax,edx
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}
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#define MAKECONSTTMulScale(s) \
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__forceinline SDWORD TMulScale##s (SDWORD a, SDWORD b, SDWORD c, SDWORD d, SDWORD e, SDWORD f) \
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{ \
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__asm mov eax,a \
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__asm imul b \
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__asm mov ebx,eax \
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__asm mov eax,d \
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__asm mov ecx,edx \
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__asm imul c \
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__asm add ebx,eax \
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__asm mov eax,e \
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__asm adc ecx,edx \
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__asm imul f \
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__asm add eax,ebx \
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__asm adc edx,ecx \
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__asm shrd eax,edx,s \
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}
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MAKECONSTTMulScale(1)
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MAKECONSTTMulScale(2)
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MAKECONSTTMulScale(3)
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MAKECONSTTMulScale(4)
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MAKECONSTTMulScale(5)
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MAKECONSTTMulScale(6)
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MAKECONSTTMulScale(7)
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MAKECONSTTMulScale(8)
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MAKECONSTTMulScale(9)
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MAKECONSTTMulScale(10)
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MAKECONSTTMulScale(11)
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MAKECONSTTMulScale(12)
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MAKECONSTTMulScale(13)
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MAKECONSTTMulScale(14)
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MAKECONSTTMulScale(15)
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MAKECONSTTMulScale(16)
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MAKECONSTTMulScale(17)
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MAKECONSTTMulScale(18)
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MAKECONSTTMulScale(19)
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MAKECONSTTMulScale(20)
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MAKECONSTTMulScale(21)
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MAKECONSTTMulScale(22)
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MAKECONSTTMulScale(23)
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MAKECONSTTMulScale(24)
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MAKECONSTTMulScale(25)
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MAKECONSTTMulScale(26)
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MAKECONSTTMulScale(27)
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MAKECONSTTMulScale(28)
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MAKECONSTTMulScale(29)
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MAKECONSTTMulScale(30)
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MAKECONSTTMulScale(31)
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#undef MAKECONSTTMulScale
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__forceinline SDWORD TMulScale32 (SDWORD a, SDWORD b, SDWORD c, SDWORD d, SDWORD e, SDWORD f)
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{
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__asm mov eax,a
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__asm imul b
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__asm mov ebx,eax
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__asm mov eax,c
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__asm mov ecx,edx
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__asm imul d
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__asm add ebx,eax
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__asm mov eax,e
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__asm adc ecx,edx
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__asm imul f
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__asm add eax,ebx
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__asm adc edx,ecx
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__asm mov eax,edx
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}
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__forceinline SDWORD BoundMulScale (SDWORD a, SDWORD b, SDWORD c)
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{
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__asm mov eax,a
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__asm imul b
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__asm mov ebx,edx
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__asm mov ecx,c
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__asm shrd eax,edx,cl
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__asm sar edx,cl
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__asm xor edx,eax
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__asm js checkit
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__asm xor edx,eax
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__asm jz skipboundit
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__asm cmp edx,0xffffffff
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__asm je skipboundit
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checkit:
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__asm mov eax,ebx
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__asm sar eax,31
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__asm xor eax,0x7fffffff
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skipboundit:
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;
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}
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__forceinline SDWORD DivScale (SDWORD a, SDWORD b, SDWORD c)
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{
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__asm mov eax,a
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__asm mov ecx,c
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__asm shl eax,cl
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__asm mov edx,a
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__asm neg cl
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__asm sar edx,cl
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__asm idiv b
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}
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__forceinline SDWORD DivScale1 (SDWORD a, SDWORD b)
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{
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__asm mov eax,a
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__asm add eax,eax
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__asm sbb edx,edx
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__asm idiv b
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}
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#define MAKECONSTDivScale(s) \
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__forceinline SDWORD DivScale##s (SDWORD a, SDWORD b) \
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{ \
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__asm mov edx,a \
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__asm sar edx,32-s \
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__asm mov eax,a \
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__asm shl eax,s \
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__asm idiv b \
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}
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MAKECONSTDivScale(2)
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MAKECONSTDivScale(3)
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MAKECONSTDivScale(4)
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MAKECONSTDivScale(5)
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MAKECONSTDivScale(6)
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MAKECONSTDivScale(7)
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MAKECONSTDivScale(8)
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MAKECONSTDivScale(9)
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MAKECONSTDivScale(10)
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MAKECONSTDivScale(11)
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MAKECONSTDivScale(12)
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MAKECONSTDivScale(13)
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MAKECONSTDivScale(14)
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MAKECONSTDivScale(15)
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MAKECONSTDivScale(16)
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MAKECONSTDivScale(17)
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MAKECONSTDivScale(18)
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MAKECONSTDivScale(19)
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MAKECONSTDivScale(20)
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MAKECONSTDivScale(21)
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MAKECONSTDivScale(22)
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MAKECONSTDivScale(23)
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MAKECONSTDivScale(24)
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MAKECONSTDivScale(25)
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MAKECONSTDivScale(26)
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MAKECONSTDivScale(27)
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MAKECONSTDivScale(28)
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MAKECONSTDivScale(29)
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MAKECONSTDivScale(30)
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MAKECONSTDivScale(31)
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#undef MAKECONSTDivScale
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__forceinline SDWORD DivScale32 (SDWORD a, SDWORD b)
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{
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__asm mov edx,a
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__asm xor eax,eax
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__asm idiv b
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}
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__forceinline void clearbuf (void *buff, unsigned int count, SDWORD clear)
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{
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SDWORD *b2 = (SDWORD *)buff;
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for (unsigned int i = 0; i != count; ++i)
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{
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b2[i] = clear;
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}
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}
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__forceinline void clearbufshort (void *buff, unsigned int count, WORD clear)
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{
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SWORD *b2 = (SWORD *)buff;
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for (unsigned int i = 0; i != count; ++i)
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{
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b2[i] = clear;
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}
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}
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__forceinline SDWORD ksgn (SDWORD a)
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{
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__asm mov edx,a
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__asm add edx,edx
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__asm sbb eax,eax
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__asm cmp eax,edx
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__asm adc eax,0
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}
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__forceinline int toint (float v)
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{
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SQWORD res;
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__asm fld v;
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__asm fistp res;
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return (int)res;
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}
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__forceinline int quickertoint (float v)
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{
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SDWORD res;
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__asm fld v;
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__asm fistp res;
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return (int)res;
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}
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#pragma warning (default: 4035)
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