mirror of https://github.com/nmlgc/ReC98.git
100 lines
1.6 KiB
NASM
100 lines
1.6 KiB
NASM
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; 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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call grcg_setcolor pascal, (GC_RMW shl 16) + 0
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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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mov ax, [si+CDGSlot.sgm_colors]
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mov word ptr cs:@@sgm_colors+1, ax
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mov ax, [bp+@@x]
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sar 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 word ptr cs:@@vram_byte_at_bottom_left+1, ax
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mov ax, [si+CDGSlot.width_divided_by_32]
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mov word ptr cs:@@width_1+1, ax
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mov word ptr cs:@@width_2+1, ax
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shl ax, 2
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add ax, (640 / 8)
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mov word ptr cs:@@stride+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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add ax, 0A800h
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mov es, ax
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push ds
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mov ax, [si+CDGSlot.sgm_alpha]
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mov ds, ax
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xor si, si
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@@stride:
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mov dx, 1234h
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cld
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@@width_1:
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mov cx, 1234h
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rep movsd
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sub di, dx
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jns short @@width_1
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xor al, al
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out 7Ch, al
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@@vram_byte_at_bottom_left:
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mov bx, 1234h
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mov di, bx
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xor si, si
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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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@@width_2:
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mov cx, 1234h
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@@blit_dword:
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mov eax, [si]
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or es:[di], eax
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add si, 4
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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 @@width_2
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mov di, bx
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mov ax, es
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add ax, 800h
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mov es, ax
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assume es:nothing
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cmp ax, 0C000h
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jb short @@width_2
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cmp ax, 0C800h
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jnb short @@ret
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add ax, 2000h
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mov es, ax
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assume es:nothing
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jmp short @@width_2
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@@ret:
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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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