ReC98/th05/hitshot_from.asm

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; Creates a hit animation at the position of [shot], invalidating [shot] in
; the process.
; void pascal near hitshot_from(shot_t near *shot)
public hitshot_from
hitshot_from proc near
@@shot = word ptr 4
push bp
mov bp, sp
push si
push di
mov di, [bp+@@shot]
mov ax, _hitshot_next_free_id
imul ax, size hitshot_t
add ax, offset _hitshots
mov si, ax
cmp _hitshot_next_free_id, HITSHOT_COUNT - 1
jnb short @@wrap_id
inc _hitshot_next_free_id
jmp short @@convert_age
@@wrap_id:
mov _hitshot_next_free_id, 0
@@convert_age:
mov [di+shot_t.flag], 2
cmp [si+hitshot_t.HITSHOT_AGE], 0
jnz short @@ret ; Wat?
mov [si+hitshot_t.HITSHOT_AGE], 1
cmp [di+shot_t.patnum_base], 20
jnz short @@patnum_32
mov [si+hitshot_t.patnum], 28
jmp short @@convert_pos_and_brake
@@patnum_32:
mov [si+hitshot_t.patnum], 32
@@convert_pos_and_brake:
mov eax, dword ptr [di+hitshot_t.pos.cur]
mov dword ptr [si+hitshot_t.pos.cur], eax
mov eax, dword ptr [di+shot_t.pos.prev]
mov dword ptr [si+hitshot_t.pos.prev], eax
mov ax, [di+shot_t.pos.velocity.x]
mov bx, 6
cwd
idiv bx
mov [si+hitshot_t.pos.velocity.x], ax
mov ax, [di+shot_t.pos.velocity.y]
cwd
idiv bx
mov [si+hitshot_t.pos.velocity.y], ax
@@ret:
pop di
pop si
pop bp
retn 2
hitshot_from endp