[Reverse-engineering] [th04/th05] Player sprite area invalidation
And once again, the TH05 version is un-decompilable. :/ It was pretty
close this time, though, as the entire block between PUSH DI and POP DI
kind of resembles a separate inlined function, in accordance with Turbo
C++'s automatic backup of the DI register, as researched in 7f971a0.
Except that it contains a loop, and Turbo C++ refuses to inline any
function with `do`, `while`, `for`, or `goto`. If it didn't, it would
have totally worked.
Also, yes, C++ class methods are treated identically in this regard.
Oh well. Shot type control functions next, finally!
Completes P0035, funded by zorg.
2019-09-24 18:54:32 +00:00
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public VECTOR2_AT
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2017-01-08 20:01:13 +00:00
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vector2_at proc far
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@@angle = word ptr 6
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@@length = word ptr 8
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@@origin_y = word ptr 0Ah
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@@origin_x = word ptr 0Ch
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@@ret = Point ptr 0Eh
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push bp
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mov bp, sp
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push si
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mov si, word ptr [bp+@@ret]
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mov bx, [bp+@@angle]
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if GAME eq 5
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xor bh, bh
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endif
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add bx, bx
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movsx eax, [bp+@@length]
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movsx edx, _CosTable8[bx]
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imul eax, edx
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sar eax, 8
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add ax, [bp+@@origin_x]
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mov [si], ax
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movsx eax, [bp+@@length]
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movsx edx, _SinTable8[bx]
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imul eax, edx
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sar eax, 8
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add ax, [bp+@@origin_y]
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mov [si+2], ax
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pop si
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pop bp
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retf 0Ah
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vector2_at endp
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