mirror of https://github.com/nmlgc/ReC98.git
121 lines
1.6 KiB
NASM
121 lines
1.6 KiB
NASM
; Displays the CDG image in the given [slot] at (⌊x/8⌋*8, y).
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; void pascal cdg_put(int x, int y, int slot);
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public CDG_PUT
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cdg_put proc far
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@@slot = word ptr 6
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@@y = word ptr 8
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@@x = word ptr 10
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push bp
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mov bp, sp
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push si
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push di
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push ds
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cli
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mov al, GC_RMW
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out 7Ch, al
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mov dx, 7Eh
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xor al, al
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out dx, al
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out dx, al
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out dx, al
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out dx, al
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sti
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mov si, [bp+@@slot]
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shl si, 4
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add si, offset _cdg_slots
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if GAME eq 4
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mov ax, [si+CDGSlot.sgm_colors]
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mov word ptr cs:@@sgm_colors+1, ax
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jmp short $+2
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mov ax, [bp+@@y]
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mov bx, ax
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shl ax, 2
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add ax, bx
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else
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mov ax, [bp+@@y]
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shl ax, 2
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add ax, [bp+@@y]
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endif
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add ax, 0A800h
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mov es, ax
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assume es:nothing
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push 0
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add ax, 3800h
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push ax
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sub ax, 2800h
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push ax
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sub ax, 800h
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push ax
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mov ax, [bp+@@x]
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shr ax, 3
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add ax, [si+CDGSlot.vram_byte_at_bottom_left]
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mov di, ax
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mov bx, ax
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mov ax, [si+CDGSlot.width_divided_by_32]
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mov bp, ax
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shl ax, 2
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add ax, (640 / 8)
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mov dx, ax
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if GAME eq 4
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mov ax, [si+CDGSlot.sgm_alpha]
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mov ds, ax
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else
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mov ax, [si+CDGSlot.sgm_colors]
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mov cx, [si+CDGSlot.sgm_alpha]
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mov ds, cx
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endif
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xor si, si
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cld
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align 2
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@@alpha:
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mov cx, bp
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rep movsd
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sub di, dx
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jns short @@alpha
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if GAME eq 5
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mov ds, ax
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endif
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xor al, al
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out 7Ch, al
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xor si, si
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if GAME eq 5
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align 2
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endif
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if GAME eq 4
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@@sgm_colors:
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mov ax, 1234h
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mov ds, ax
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assume ds:nothing
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endif
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@@next_plane:
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mov di, bx
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@@next_row:
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mov cx, bp
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@@blit_dword:
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lodsd
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or es:[di], eax
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add di, 4
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loop @@blit_dword
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sub di, dx
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jns short @@next_row
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pop ax
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mov es, ax
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or ax, ax
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jnz short @@next_plane
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pop ds
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assume ds:_DATA
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pop di
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pop si
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pop bp
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retf 6
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cdg_put endp
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align 2
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