mirror of https://github.com/nmlgc/ReC98.git
48 lines
698 B
NASM
48 lines
698 B
NASM
public SCROLL_SUBPIXEL_Y_TO_VRAM_SEG3
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scroll_subpixel_y_to_vram_seg3 proc near
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arg_bx near, @sy:word
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mov ax, @sy
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sar ax, 4
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cmp _scroll_active, 0
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jz short @@lt400?
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add ax, _scroll_line
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@@lt400?:
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cmp ax, RES_Y
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jl short @@lt0?
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sub ax, RES_Y
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jmp short @@ret
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@@lt0?:
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or ax, ax
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jge short @@ret
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add ax, RES_Y
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@@ret:
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ret_bx
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scroll_subpixel_y_to_vram_seg3 endp
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public SCROLL_SUBPIXEL_Y_TO_VRAM_ALWAYS
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scroll_subpixel_y_to_vram_always proc near
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arg_bx near, @sy:word
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mov ax, @sy
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sar ax, 4
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add ax, _scroll_line
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cmp ax, RES_Y
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jl short @@lt0?
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sub ax, RES_Y
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jmp short @@ret
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@@lt0?:
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or ax, ax
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jge short @@ret
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add ax, RES_Y
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@@ret:
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ret_bx
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scroll_subpixel_y_to_vram_always endp
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nop
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