mirror of https://github.com/nmlgc/ReC98.git
118 lines
3.0 KiB
NASM
118 lines
3.0 KiB
NASM
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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_local = word ptr -2
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@@input = word ptr 4
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enter 2, 0
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mov dl, MOVE_VALID
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mov ax, [bp+@@input]
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mov [bp+@@input_local], ax
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mov cx, @@num_cases
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mov bx, offset @@switch_table
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@@case_lookup:
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mov ax, cs:[bx]
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cmp ax, [bp+@@input_local]
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jz short @@switch
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add bx, 2
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loop @@case_lookup
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jmp short @@default
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; ---------------------------------------------------------------------------
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@@switch:
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jmp word ptr cs:[bx+@@case_to_target] ; switch jump
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@@standing_still:
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mov dl, MOVE_NOINPUT
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@left:
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mov player_pos.velocity.x, -playchar_speed_aligned
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@down_left:
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mov player_pos.velocity.x, -playchar_speed_diagonal
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mov player_pos.velocity.y, playchar_speed_diagonal
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@down:
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mov player_pos.velocity.y, playchar_speed_aligned
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@down_right:
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mov player_pos.velocity.x, playchar_speed_diagonal
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mov player_pos.velocity.y, playchar_speed_diagonal
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@right:
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mov player_pos.velocity.x, playchar_speed_aligned
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@up_right:
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mov player_pos.velocity.x, playchar_speed_diagonal
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jmp short @@up_left_y
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; ---------------------------------------------------------------------------
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@@up:
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mov player_pos.velocity.y, -playchar_speed_aligned
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@up_left:
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mov player_pos.velocity.x, -playchar_speed_diagonal
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@@up_left_y:
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mov player_pos.velocity.y, -playchar_speed_diagonal
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jmp short @@ret
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; ---------------------------------------------------------------------------
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@@default:
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mov dl, MOVE_INVALID
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@@ret:
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mov al, dl
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leave
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retn 2
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; ---------------------------------------------------------------------------
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db 0
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@@switch_table label word
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; value table for switch statement
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dw INPUT_NONE
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dw INPUT_UP
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dw INPUT_DOWN
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dw INPUT_LEFT
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dw INPUT_UP or INPUT_LEFT
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dw INPUT_DOWN or INPUT_LEFT
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dw INPUT_RIGHT
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dw INPUT_UP or INPUT_RIGHT
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dw INPUT_DOWN or INPUT_RIGHT
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dw INPUT_UP_LEFT
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dw INPUT_UP_RIGHT
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dw INPUT_DOWN_LEFT
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dw INPUT_DOWN_RIGHT
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@@case_to_target = $ - @@switch_table
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@@num_cases = @@case_to_target shr 1
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; jump table for switch statement
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dw offset @@standing_still
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dw offset @@up
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dw offset @@down
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dw offset @@left
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dw offset @@up_left
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dw offset @@down_left
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dw offset @@right
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dw offset @@up_right
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dw offset @@down_right
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dw offset @@up_left
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dw offset @@up_right
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dw offset @@down_left
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dw offset @@down_right
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player_move endp
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