mirror of https://github.com/nmlgc/ReC98.git
106 lines
2.0 KiB
NASM
106 lines
2.0 KiB
NASM
; Displays the CDG image in the given [slot] centered at (⌊x_center/8⌋*8,
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; y_center), then applies a dissolve effect with the given [strength]
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; (mod 8, 0 = none, 7 = full) on the E bitplane.
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; void pascal cdg_put_dissolve_e(int x_center, int y_center, int slot, int strength);
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public _cdg_put_dissolve_e
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_cdg_put_dissolve_e proc near
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@@h = word ptr -6
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@@w = word ptr -4
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@@p_offset = word ptr -2
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@@strength = word ptr 4
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@@slot = word ptr 6
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@@y_center = word ptr 8
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@@x_center = word ptr 0Ah
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enter 6, 0
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push si
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push di
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mov bx, [bp+@@slot]
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shl bx, 4
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mov ax, _cdg_slots.pixel_width[bx]
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mov [bp+@@w], ax
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mov bx, [bp+@@slot]
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shl bx, 4
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mov ax, _cdg_slots.pixel_height[bx]
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mov [bp+@@h], ax
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mov ax, [bp+@@w]
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cwd
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sub ax, dx
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sar ax, 1
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sub [bp+@@x_center], ax
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mov ax, [bp+@@h]
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cwd
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sub ax, dx
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sar ax, 1
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sub [bp+@@y_center], ax
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cmp byte_10BC7, 0
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jz short @@put_noalpha
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cmp byte_10BB5, 0
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jnz short @@put_alpha
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@@put_noalpha:
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call _cdg_put_noalpha pascal, [bp+@@x_center], [bp+@@y_center], [bp+@@slot]
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jmp short @@dissolve_prepare
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@@put_alpha:
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call _cdg_put pascal, [bp+@@x_center], [bp+@@y_center], [bp+@@slot]
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@@dissolve_prepare:
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and [bp+@@strength], 7
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cmp [bp+@@strength], 0
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jz short @@ret
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mov bx, 16
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mov ax, [bp+@@w]
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cwd
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idiv bx
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mov [bp+@@w], ax
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mov ax, [bp+@@y_center]
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add [bp+@@h], ax
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mov ax, [bp+@@x_center]
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sar ax, 3
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mov dx, [bp+@@y_center]
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shl dx, 6
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add ax, dx
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mov dx, [bp+@@y_center]
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shl dx, 4
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add ax, dx
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mov [bp+@@p_offset], ax
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mov ax, 0E000h
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mov es, ax
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assume es:nothing
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mov bx, [bp+@@strength]
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shl bx, 3
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add bx, offset CDG_DISSOLVE_PATTERN
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mov dx, [bp+@@y_center]
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@@dissolve_next_row:
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mov si, dx
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; Hack (and si, 3)
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db 081h
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db 0e6h
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db 003h
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db 000h
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shl si, 1
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mov ax, [bx+si]
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not ax
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mov di, [bp+@@p_offset]
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mov cx, [bp+@@w]
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@@dissolve_apply:
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and es:[di], ax
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add di, 2
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loop @@dissolve_apply
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add [bp+@@p_offset], (640 / 8)
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inc dx
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cmp dx, [bp+@@h]
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jb short @@dissolve_next_row
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@@ret:
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pop di
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pop si
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leave
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retn 8
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_cdg_put_dissolve_e endp
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