mirror of https://github.com/nmlgc/ReC98.git
113 lines
1.9 KiB
NASM
113 lines
1.9 KiB
NASM
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; Displays the CDG image in the given [slot] at (⌊x/8⌋*8, y), flipped
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; horizontally.
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; void DEFCONV cdg_put_hflip(int x, int y, int slot);
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proc_defconv _cdg_put_hflip
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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, [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 bx, [si+CDGSlot.width_divided_by_32]
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shl bx, 2
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add ax, bx
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dec ax
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mov di, ax
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mov word ptr cs:@@last_x_alpha+1, ax
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mov word ptr cs:@@last_x_colors+1, ax
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mov word ptr cs:@@width_bytes_alpha+1, bx
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mov word ptr cs:@@width_bytes_colors+1, bx
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mov ax, (640 / 8)
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sub ax, bx
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mov word ptr cs:@@stride_alpha+1, ax
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mov word ptr cs:@@stride_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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add ax, 0A800h
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mov es, ax
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assume es:nothing
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mov bx, offset hflip_lut
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mov fs, [si+CDGSlot.sgm_alpha]
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xor si, si
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@@stride_alpha:
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mov dx, 1234h
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nop
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@@width_bytes_alpha:
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mov cx, 1234h
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@@blit_hflip_alpha:
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mov al, fs:[si]
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xlat
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mov es:[di], al
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inc si
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dec di
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loop @@blit_hflip_alpha
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sub di, dx
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jns short @@width_bytes_alpha
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xor al, al
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out 7Ch, al
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@@last_x_alpha:
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mov di, 1234h
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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 fs, [si+CDGSlot.sgm_colors]
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xor si, si
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@@stride_colors:
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mov dx, 1234h
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nop
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@@width_bytes_colors:
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mov cx, 1234
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@@blit_hflip_colors:
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mov al, fs:[si]
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xlat
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or es:[di], al
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inc si
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dec di
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loop @@blit_hflip_colors
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sub di, dx
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jns short @@width_bytes_colors
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@@last_x_colors:
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mov di, 1234h
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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_bytes_colors
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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_bytes_colors
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@@ret:
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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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endp_defconv
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align 2
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