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Figured out and made comments of math tables in roms 14/15 of Seibu Cup Soccer bootleg inside machine/seicop.c [O. Galibert]

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This commit is contained in:
Angelo Salese 2011-01-13 20:59:53 +00:00
parent 2c106c458a
commit e52c7c1c9f
1 changed files with 55 additions and 6 deletions
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61
src/mame/machine/seicop.c
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@ -2107,10 +2107,18 @@ static WRITE16_HANDLER( generic_cop_w )
cop_status &= 0x7fff;
/*
endianess changes:
dword no change
word Add / Subtract two
byte ?
Macro notes:
- endianess changes from/to Raiden 2:
dword ^= 0
word ^= 2
byte ^= 3
- some macro commands here have a commented algorythm, it's how Seibu Cup Bootleg version handles maths inside the 14/15 roms.
The ROMs map tables in the following arrangement:
0x00000 - 0x1ffff Sine math results
0x20000 - 0x3ffff Cosine math results
0x40000 - 0x7ffff Division math results
0x80000 - 0xfffff Pythagorean theorem, hypotenuse length math results
Surprisingly atan maths are nowhere to be found from the roms.
*/
/* "automatic" movement */
@ -2139,6 +2147,17 @@ static WRITE16_HANDLER( generic_cop_w )
/* SINE math - 0x8100 */
/* FIXME: cop scale is unreliable */
/*
00000-0ffff:
amp = x/256
ang = x & 255
s = sin(ang*2*pi/256)
val = trunc(s*amp)
if(s<0)
val--
if(s == 192)
val = -2*amp
*/
if(COP_CMD(0xb9a,0xb88,0x888,0x000,0x000,0x000,0x000,0x000,7,0xfdfb))
{
int raw_angle = (space->read_word(cop_register[0]+(0x34^2)) & 0xff);
@ -2155,6 +2174,17 @@ static WRITE16_HANDLER( generic_cop_w )
/* COSINE math - 0x8900 */
/* FIXME: cop scale is unreliable */
/*
10000-1ffff:
amp = x/256
ang = x & 255
s = cos(ang*2*pi/256)
val = trunc(s*amp)
if(s<0)
val--
if(s == 128)
val = -2*amp
*/
if(COP_CMD(0xb9a,0xb8a,0x88a,0x000,0x000,0x000,0x000,0x000,7,0xfdfb))
{
int raw_angle = (space->read_word(cop_register[0]+(0x34^2)) & 0xff);
@ -2188,6 +2218,7 @@ static WRITE16_HANDLER( generic_cop_w )
return;
}
/* Pythagorean theorem, hypotenuse direction - 130e / 138e */
//(heatbrl) | 5 | bf7f | 138e | 984 aa4 d82 aa2 39b b9a b9a b9a
if(COP_CMD(0x984,0xaa4,0xd82,0xaa2,0x39b,0xb9a,0xb9a,0xb9a,5,0xbf7f))
{
@ -2202,14 +2233,21 @@ static WRITE16_HANDLER( generic_cop_w )
cop_angle += 0x80;
}
/* is this the only difference? no, that's not it, check Legionnaire */
/* TODO: bit 7 of macro command says if we have to write on work RAM */
//if(0)
space->write_byte(cop_register[0]+(0x34^3), cop_angle);
return;
}
/* Pythagorean theorem, hypotenuse length - 0x3bb0 */
//07 | 4 | 007f | 3bb0 | f9c b9c b9c b9c b9c b9c b9c 99c
//(grainbow) | 4 | 007f | 3bb0 | f9c b9c b9c b9c b9c b9c b9c 99c
/*
40000-7ffff:
v1 = (x / 32768)*64
v2 = (x & 255)*32767/255
val = sqrt(v1*v1+v2*v2) (unsigned)
*/
if(COP_CMD(0xf9c,0xb9c,0xb9c,0xb9c,0xb9c,0xb9c,0xb9c,0x99c,4,0x007f))
{
int dx = space->read_dword(cop_register[1]+4) - space->read_dword(cop_register[0]+4);
@ -2219,11 +2257,22 @@ static WRITE16_HANDLER( generic_cop_w )
dy = dy >> 16;
cop_dist = sqrt((double)(dx*dx+dy*dy));
/* TODO: bit 7 of macro command says if we have to write on work RAM */
space->write_word(cop_register[0]+(0x38^2), cop_dist);
return;
}
/* Division - 0x42c2 - */
/* Division - 0x42c2 */
/*
20000-2ffff:
v1 = x / 1024
v2 = x & 1023
val = !v1 ? 32767 : trunc(v2/v1+0.5)
30000-3ffff:
v1 = x / 1024
v2 = (x & 1023)*32
val = !v1 ? 32767 : trunc(v2/v1+0.5)
*/
if(COP_CMD(0xf9a,0xb9a,0xb9c,0xb9c,0xb9c,0x29c,0x000,0x000,5,0xfcdd))
{
int div = space->read_word(cop_register[0]+(0x36^2));