MoveObject
right
    lda controller
    and #%00000001
    beq notRight
    lda object_dx + 1
    bmi notRight

    lda object_dx
    clc
    adc object_acc
    sta object_dx
    lda object_dx + 1
    adc #0
    sta object_dx + 1

    CLAMP_S16 object_dx, object_dx_min, object_dx_max

    jmp dxTox

notRight
    lda object_dx + 1
    beq + ; MSB of object_dx is 0, check if LSB needs to be decreased

    lda object_dx
    sec
    sbc object_dec
    sta object_dx
    lda object_dx + 1
    sbc #0
    sta object_dx + 1
    jmp dxTox
+
    lda object_dx
    beq left
    sec
    sbc object_dec
    bcs +
    lda #0
+
    sta object_dx
    jmp dxTox

left
    lda controller
    and #%00000010
    beq notLeft
    lda object_dx + 1
    beq +
    bpl notLeft
+
    lda object_dx
    sec
    sbc object_acc
    sta object_dx
    lda object_dx + 1
    sbc #0
    sta object_dx + 1

    CLAMP_S16 object_dx, object_dx_min, object_dx_max

    jmp dxTox

notLeft
    lda object_dx + 1
    beq +

    lda object_dx
    clc
    adc object_dec
    sta object_dx
    lda object_dx + 1
    adc #0
    sta object_dx + 1
    jmp dxTox
+
    lda object_dx
    beq dxTox
    clc
    adc object_dec
    bcc +
    lda #0
+
    sta object_dx


dxTox