mirror of https://github.com/nmlgc/ReC98.git
48 lines
942 B
NASM
48 lines
942 B
NASM
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; Constructs a vector from (x1|y1) to (x2|y2), and additionally applies
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; [plus_angle] to the resulting angle between the two points.
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; int pascal far vector2(int r, int far *dx, int far *dy, char plus_angle, int y2, int x2, int y1, int x1)
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vector2_between_plus proc far
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@@r = word ptr 6
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@@_dx = dword ptr 8
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@@_dy = dword ptr 0Ch
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@@plus_angle = byte ptr 10h
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@@y2 = word ptr 12h
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@@x2 = word ptr 14h
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@@y1 = word ptr 16h
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@@x1 = word ptr 18h
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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, [bp+@@r]
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mov ax, [bp+@@y2]
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sub ax, [bp+@@y1]
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push ax
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mov ax, [bp+@@x2]
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sub ax, [bp+@@x1]
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push ax
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call iatan2
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add al, [bp+@@plus_angle]
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mov dl, al
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movsx eax, si
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mov dh, 0
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add dx, dx
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mov bx, dx
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movsx edx, _CosTable8[bx]
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movsx ecx, _SinTable8[bx]
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imul eax, edx
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sar eax, 8
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les bx, [bp+@@_dy]
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mov es:[bx], ax
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movsx eax, si
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imul eax, ecx
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sar eax, 8
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les bx, [bp+@@_dx]
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mov es:[bx], ax
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pop si
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pop bp
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retf 14h
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vector2_between_plus endp
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