mirror of https://github.com/nmlgc/ReC98.git
121 lines
2.3 KiB
NASM
121 lines
2.3 KiB
NASM
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.186
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locals
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include libs/master.lib/macros.inc
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include th04/math/motion.inc
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include th04/hardware/input.inc
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extrn player_pos:motion_t
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extrn _playchar_speed_aligned:word
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extrn _playchar_speed_diagonal:word
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; ----------------------------------------------------------------------------
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main_01_TEXT segment word public 'CODE' use16
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assume cs:main_01_TEXT
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; move_ret_t pascal near player_move(int input);
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public PLAYER_MOVE
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player_move proc near
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@@input = word ptr ss:[bx+2]
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@@diagonal_x equ ax
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@@diagonal_y equ cx
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@@aligned equ dx
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mov bx, sp
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mov bx, @@input
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cmp bl, INPUT_RIGHT or INPUT_DOWN
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ja short @@invalid
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mov @@diagonal_y, _playchar_speed_diagonal
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mov @@diagonal_x, @@diagonal_y
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mov @@aligned, _playchar_speed_aligned
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and bh, low INPUT_MOVEMENT
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jz short @@switch
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or bl, bl
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jnz short @@invalid
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shr bx, 8
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cmp bl, 8
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ja short @@invalid
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add bl, 11
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@@switch:
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add bx, bx
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jmp word ptr cs:@@switch_table[bx]
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@@up:
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neg @@aligned
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@@down:
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mov player_pos.velocity.y, @@aligned
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jmp short @@moved
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; ---------------------------------------------------------------------------
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@@left:
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neg @@aligned
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@@right:
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mov player_pos.velocity.x, @@aligned
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jmp short @@moved
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; ---------------------------------------------------------------------------
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@@up_right:
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neg @@diagonal_y
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jmp short @@down_right
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; ---------------------------------------------------------------------------
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@@up_left:
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neg @@diagonal_y
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@@down_left:
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neg @@diagonal_x
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@@down_right:
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mov player_pos.velocity.x, @@diagonal_x
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mov player_pos.velocity.y, @@diagonal_y
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jmp short @@moved
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; ---------------------------------------------------------------------------
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@@standing_still:
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mov al, MOVE_NOINPUT
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@invalid:
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xor al, al
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@moved:
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mov al, MOVE_VALID
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@@ret:
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retn 2
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; ---------------------------------------------------------------------------
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@@switch_table label word
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dw @@standing_still
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dw @@up
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dw @@down
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dw @@invalid
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dw @@left
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dw @@up_left
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dw @@down_left
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dw @@invalid
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dw @@right
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dw @@up_right
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dw @@down_right
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dw @@invalid
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dw @@up_left
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dw @@up_right
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dw @@invalid
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dw @@down_left
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dw @@invalid
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dw @@invalid
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dw @@invalid
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dw @@down_right
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player_move endp
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main_01_TEXT ends
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end
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