mirror of https://github.com/nmlgc/ReC98.git
60 lines
1.2 KiB
NASM
60 lines
1.2 KiB
NASM
; Copy of pi_slot_put() that only displays every second row in the given PI.
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; int DEFCONV pi_slot_put_interlace(int x, int y, int slot)
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proc_defconv pi_slot_put_interlace
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arg @@x:word, @@y:word, @@slot:word
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local @@row_num:word, @@row_buf:dword
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push si
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push di
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mov si, @@y
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mov di, @@slot
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mov bx, di
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shl bx, 2
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mov ax, word ptr (_pi_slot_buffers+2)[bx]
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mov dx, word ptr _pi_slot_buffers[bx]
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mov word ptr @@row_buf+2, ax
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mov word ptr @@row_buf, dx
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mov @@row_num, 0
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jmp short @@check
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@@put:
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push @@x
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push si
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pushd @@row_buf
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mov bx, di
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imul bx, size PiHeader
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push _pi_slot_headers.PiHeader._xsize[bx]
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call graph_pack_put_8
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inc si
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cmp si, 400
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jl short @@next_row
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sub si, 400
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@@next_row:
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mov bx, di
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imul bx, size PiHeader
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mov ax, _pi_slot_headers.PiHeader._xsize[bx]
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add word ptr @@row_buf, ax
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mov eax, @@row_buf
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shr eax, 10h
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mov dx, word ptr @@row_buf
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shr dx, 4
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add ax, dx
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mov dx, word ptr @@row_buf
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and dx, 0Fh
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mov word ptr @@row_buf+2, ax
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mov word ptr @@row_buf, dx
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add @@row_num, 2
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@@check:
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mov bx, di
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imul bx, size PiHeader
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mov ax, _pi_slot_headers.PiHeader._ysize[bx]
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cmp ax, @@row_num
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ja short @@put
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pop di
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pop si
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ret
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endp_defconv
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