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Documenting what's wrong with Seibu Cup Soccer collision detection (nw)

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This commit is contained in:
angelosa 2016-07-05 23:06:59 +02:00
parent c12afa4937
commit 6a678b85d9
2 changed files with 28 additions and 4 deletions
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22
src/mame/machine/seibucop/seibucop.cpp
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@ -49,7 +49,25 @@
- stage 4: has sprite stuck on bottom-left of screen;
- palette dims too much on attract / continue screen.
It's known that the DMA data arrangement gives same results on a real Legionnaire board, so shrug?
Seibu Cup Soccer
- Handles collision detection via the 130e/3bb0 macros
130e version in this makes a sub instead of an add as last opcode, which in turn reflects with
the distance (which we do know that is internally loaded somehow).
013F3C: 3D7C 130E 0100 move.w #$130e, ($100,A6) // angle macro
013F42: 302E 01B4 move.w ($1b4,A6), D0 // take the angle
013F46: 082E 000F 01B0 btst #$f, ($1b0,A6) // is status exception flag raised?
013F4C: 6712 beq $13f60
013F4E: 2228 0004 move.l ($4,A0), D1
013F52: B2A8 0044 cmp.l ($44,A0), D1 // compares Y value against the next object (yes, cop_regs[1] + 0x40 = cop_regs[0])
013F56: 6708 beq $13f60 // if equal then check the distance
013F58: 6E04 bgt $13f5e
013F5A: 7040 moveq #$40, D0 // set angle direction left ...
013F5C: 6002 bra $13f60
013F5E: 70C0 moveq #-$40, D0 // ... or right
013F60: 3D7C 3BB0 0100 move.w #$3bb0, ($100,A6) // dist macro
013F66: 1140 003D move.b D0, ($3d,A0) // move angle value to [0x3d]
013F6A: 4E75 rts
Tech notes (to move into own file with doxy mainpage):
-----------
[0x6fc] DMA mode bit scheme:
@ -66,6 +84,8 @@
[0x10-0x13] Y offset (a.k.a. calculated sine)
[0x14-0x17] X offset (a.k.a. calculated cosine)
[0x37] angle direction
TOC
[0x11381c] ball object
***************************************************************************/

10
src/mame/machine/seibucop/seibucop_cmd.hxx
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@ -72,16 +72,20 @@ void raiden2cop_device::LEGACY_execute_130e_cupsoc(int offset, UINT16 data)
{
int dy = m_host_space->read_dword(cop_regs[1] + 4) - m_host_space->read_dword(cop_regs[0] + 4);
int dx = m_host_space->read_dword(cop_regs[1] + 8) - m_host_space->read_dword(cop_regs[0] + 8);
cop_status = 7;
if (!dx) {
cop_status |= 0x8000;
cop_angle = 0;
}
else {
else
{
cop_angle = (int)(atan(double(dy) / double(dx)) * 128.0 / M_PI);
if (dx < 0)
cop_angle += 0x80;
cop_angle &= 0xff;
}
m_LEGACY_r0 = dy;
@ -90,7 +94,7 @@ void raiden2cop_device::LEGACY_execute_130e_cupsoc(int offset, UINT16 data)
//printf("%d %d %f %04x\n",dx,dy,atan(double(dy)/double(dx)) * 128 / M_PI,cop_angle);
if (data & 0x80)
m_host_space->write_word(cop_regs[0] + (0x34 ^ 2), cop_angle);
cop_write_byte(cop_regs[0] + (0x34), cop_angle);
}
/*