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ReC98/th02/math/randring.inc

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[Reverse-engineering] [th02/th03/th04/th05] Random number ring buffer Yes, you're reading that correctly. If the cursor is at 255, reading a 16-bit value will fill the upper 8 bits with the neighboring cursor value, which always is 0xFF. Funded by -Tom-.
2018-03-16 08:19:50 +00:00
RANDRING_NEXT_DEF macro instance
[Maintenance] Random number ring buffer: Remove `extern "C"` Didn't expect to cover it this soon, but I'd really like to have a "is range a power of two" template. Part of P0242, funded by Yanga.
2023-06-04 13:37:05 +00:00
public @randring&instance&_next8$qv
@randring&instance&_next8$qv proc near
[Reverse-engineering] [th02/th03/th04/th05] Random number ring buffer Yes, you're reading that correctly. If the cursor is at 255, reading a 16-bit value will fill the upper 8 bits with the neighboring cursor value, which always is 0xFF. Funded by -Tom-.
2018-03-16 08:19:50 +00:00
mov bl, _randring_p
inc _randring_p
mov bh, 0
mov al, _randring[bx]
ret
[Maintenance] Random number ring buffer: Remove `extern "C"` Didn't expect to cover it this soon, but I'd really like to have a "is range a power of two" template. Part of P0242, funded by Yanga.
2023-06-04 13:37:05 +00:00
@randring&instance&_next8$qv endp
[Reverse-engineering] [th02/th03/th04/th05] Random number ring buffer Yes, you're reading that correctly. If the cursor is at 255, reading a 16-bit value will fill the upper 8 bits with the neighboring cursor value, which always is 0xFF. Funded by -Tom-.
2018-03-16 08:19:50 +00:00
[Maintenance] Random number ring buffer: Remove `extern "C"` Didn't expect to cover it this soon, but I'd really like to have a "is range a power of two" template. Part of P0242, funded by Yanga.
2023-06-04 13:37:05 +00:00
public @RANDRING&instance&_NEXT8_AND$QUC
@randring&instance&_next8_and$quc proc near
arg @@mask:byte
[Reverse-engineering] [th02/th03/th04/th05] Random number ring buffer Yes, you're reading that correctly. If the cursor is at 255, reading a 16-bit value will fill the upper 8 bits with the neighboring cursor value, which always is 0xFF. Funded by -Tom-.
2018-03-16 08:19:50 +00:00
push bp
mov bp, sp
mov bl, _randring_p
inc _randring_p
mov bh, 0
mov al, _randring[bx]
and al, @@mask
pop bp
ret 2
[Maintenance] Random number ring buffer: Remove `extern "C"` Didn't expect to cover it this soon, but I'd really like to have a "is range a power of two" template. Part of P0242, funded by Yanga.
2023-06-04 13:37:05 +00:00
@randring&instance&_next8_and$quc endp
[Reverse-engineering] [th02/th03/th04/th05] Random number ring buffer Yes, you're reading that correctly. If the cursor is at 255, reading a 16-bit value will fill the upper 8 bits with the neighboring cursor value, which always is 0xFF. Funded by -Tom-.
2018-03-16 08:19:50 +00:00
[Maintenance] Random number ring buffer: Remove `extern "C"` Didn't expect to cover it this soon, but I'd really like to have a "is range a power of two" template. Part of P0242, funded by Yanga.
2023-06-04 13:37:05 +00:00
public @randring&instance&_next16$qv
@randring&instance&_next16$qv proc near
[Reverse-engineering] [th02/th03/th04/th05] Random number ring buffer Yes, you're reading that correctly. If the cursor is at 255, reading a 16-bit value will fill the upper 8 bits with the neighboring cursor value, which always is 0xFF. Funded by -Tom-.
2018-03-16 08:19:50 +00:00
mov bl, _randring_p
inc _randring_p
mov bh, 0
mov ax, word ptr _randring[bx]
ret
[Maintenance] Random number ring buffer: Remove `extern "C"` Didn't expect to cover it this soon, but I'd really like to have a "is range a power of two" template. Part of P0242, funded by Yanga.
2023-06-04 13:37:05 +00:00
@randring&instance&_next16$qv endp
[Reverse-engineering] [th02/th03/th04/th05] Random number ring buffer Yes, you're reading that correctly. If the cursor is at 255, reading a 16-bit value will fill the upper 8 bits with the neighboring cursor value, which always is 0xFF. Funded by -Tom-.
2018-03-16 08:19:50 +00:00
endm