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- removed krecipasm.

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Analyzing the results, this is not needed as its precision is virtually the same as floating point math, so its one use got replaced.
This commit is contained in:
Christoph Oelckers 2021-03-19 14:23:41 +01:00
parent dd15fc54c1
commit 76682c72e3
3 changed files with 3 additions and 18 deletions
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4
source/build/src/engine.cpp
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@ -73,7 +73,6 @@ int32_t globalflags;
static int8_t tempbuf[MAXWALLS]; static int8_t tempbuf[MAXWALLS];
// referenced from asm // referenced from asm
int32_t reciptable[2048];
intptr_t asm1, asm2; intptr_t asm1, asm2;
int32_t globalx1, globaly2, globalx3, globaly3; int32_t globalx1, globaly2, globalx3, globaly3;
@ -319,9 +318,6 @@ static int32_t engineLoadTables(void)
{ {
int32_t i; int32_t i;
for (i=0; i<2048; i++)
reciptable[i] = DivScale(2048, i+2048, 30);
for (i=0; i<=512; i++) for (i=0; i<=512; i++)
sintable[i] = bsinf(i); sintable[i] = bsinf(i);
for (i=513; i<1024; i++) for (i=513; i<1024; i++)

1
source/build/src/engine_priv.h
View file

@ -69,7 +69,6 @@ extern int32_t rx1[MAXWALLSB], ry1[MAXWALLSB];
extern int16_t bunchp2[MAXWALLSB]; extern int16_t bunchp2[MAXWALLSB];
extern int16_t numscans, numbunches; extern int16_t numscans, numbunches;
extern int32_t rxi[8], ryi[8]; extern int32_t rxi[8], ryi[8];
extern int32_t reciptable[2048];
// int32_t wallmost(int16_t *mostbuf, int32_t w, int32_t sectnum, char dastat); // int32_t wallmost(int16_t *mostbuf, int32_t w, int32_t sectnum, char dastat);

16
source/build/src/polymost.cpp
View file

@ -915,16 +915,6 @@ skip: ;
#endif #endif
} }
// Moved in from pragmas.h
static inline int32_t krecipasm(int32_t i)
{
// Ken did this
union { int32_t i; float f; } x;
x.f = (float)i;
i = x.i;
return ((reciptable[(i >> 12) & 2047] >> (((i - 0x3f800000) >> 23) & 31)) ^ (i >> 31));
}
// variables that are set to ceiling- or floor-members, depending // variables that are set to ceiling- or floor-members, depending
// on which one is processed right now // on which one is processed right now
static int32_t global_cf_z; static int32_t global_cf_z;
@ -956,14 +946,14 @@ static void polymost_internal_nonparallaxed(vec2f_t n0, vec2f_t n1, float ryp0,
wall[wall[sec->wallptr].point2].y - wall[sec->wallptr].y }; wall[wall[sec->wallptr].point2].y - wall[sec->wallptr].y };
float r; float r;
int length = ksqrt(uhypsq(xy.x, xy.y));
if (globalorientation & 2) if (globalorientation & 2)
{ {
int i = krecipasm(ksqrt(uhypsq(xy.x,xy.y))); r = 1.f / length;
r = i * (1.f/1073741824.f);
} }
else else
{ {
int i = ksqrt(uhypsq(xy.x,xy.y)); if (i == 0) i = 1024; else i = 1048576 / i; int i; if (length == 0) i = 1024; else i = 1048576 / length; // consider integer truncation
r = i * (1.f/1048576.f); r = i * (1.f/1048576.f);
} }