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Calculate sine and arctan tables, getting rid of TABLES.DAT dependency.

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We're pulling stuff from math.h even in non-GL builds right now, so
adding libc's sin() and atan() doesn't seem like a big deal.  In the
unlikely event that their accuracy is so bad that the calculated tables
don't match the original ones, a warning is issued on little-endian
platforms.

git-svn-id: https://svn.eduke32.com/eduke32@2988 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2012-09-02 14:08:43 +00:00
parent 5bca5f59ad
commit ee39d713e8
2 changed files with 39 additions and 18 deletions
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2
polymer/eduke32/build/include/build.h
View file

@ -16,7 +16,7 @@
extern "C" {
#endif
#define PI 3.14159265358979323
#define PI 3.14159265358979323846
#define MAXSECTORSV8 4096
#define MAXWALLSV8 16384

49
polymer/eduke32/build/src/engine.c
View file

@ -2262,7 +2262,6 @@ static int32_t globaly1, globalx2, globalzx;
static int32_t globalx, globaly, globalz;
int16_t sectorborder[256], sectorbordercnt;
static char tablesloaded = 0;
int32_t ydim16, qsetmode = 0;
int32_t startposx, startposy, startposz;
int16_t startang, startsectnum;
@ -7498,35 +7497,57 @@ static inline void calcbritable(void)
}
}
#define BANG2RAD (PI/1024.0)
static int32_t loadtables(void)
{
int32_t i, fil;
static char tablesloaded = 0;
if (tablesloaded == 0)
{
int32_t i;
initksqrt();
for (i=0; i<2048; i++)
reciptable[i] = divscale30(2048, i+2048);
if ((fil = kopen4load("tables.dat",0)) != -1)
for (i=0; i<=512; i++)
sintable[i] = 16384*sin(i*BANG2RAD);
for (i=513; i<1024; i++)
sintable[i] = sintable[1024-i];
for (i=1024; i<2048; i++)
sintable[i] = -sintable[i-1024];
for (i=0; i<640; i++)
radarang[i] = -64*atan((640-0.5-i)/160)/BANG2RAD;
for (i=0; i<640; i++)
radarang[1279-i] = -radarang[i];
#ifdef B_LITTLE_ENDIAN
i = 0;
if (crc32once((uint8_t *)sintable, sizeof(sintable)) != 0xee1e7aba)
i |= 1;
if (crc32once((uint8_t *)radarang, 640*sizeof(radarang[0])) != 0xee893d92)
i |= 2;
if (i != 0)
{
kread(fil,sintable,2048*2); for (i=2048-1; i>=0; i--) sintable[i] = B_LITTLE16(sintable[i]);
kread(fil,radarang,640*2); for (i=640-1; i>=0; i--) radarang[i] = B_LITTLE16(radarang[i]);
for (i=0; i<640; i++) radarang[1279-i] = -radarang[i];
static const char *str[3] = { "sine table", "arctangent table",
"sine and arctangent tables" };
initprintf("WARNING: Calculated %s differ%s from original!\n",
str[i-1], i==3 ? "" : "s");
}
#endif
// TABLES.DAT format:
//kread(fil,sintable,2048*2);
//kread(fil,radarang,640*2);
//kread(fil,textfont,1024);
//kread(fil,smalltextfont,1024);
//kread(fil,britable,1024);
calcbritable();
kclose(fil);
}
else
{
engineerrstr = "Failed to load \"tables.dat\"!";
initprintf("ERROR: %s\n", engineerrstr);
return 1;
}
tablesloaded = 1;
}