607 lines
10 KiB
ArmAsm
607 lines
10 KiB
ArmAsm
TARGET_NONE = $00
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TARGET_DOOR = $10
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TARGET_SHIELD = $20
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TARGET_FRIEND = $30
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TARGET_ALIEN = $40
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TARGET_PHYSICIST= $80
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;=============================
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;=============================
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; recalc_walk_collision
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;=============================
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;=============================
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; far left limit is LEVEL_LEFT limit
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; far right limit is LEVEL_RIGHT limit
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; any LOCKED doors in the way also stop things
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; FIXME: only door collision if on same level
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recalc_walk_collision:
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; note the limits have $80 added to them :(
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lda RIGHT_LIMIT
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sta RIGHT_WALK_LIMIT
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lda LEFT_LIMIT
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sta LEFT_WALK_LIMIT
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lda NUM_DOORS
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beq done_recalc_walk_right_collision
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recalc_walk_left:
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ldy NUM_DOORS
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dey
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recalc_walk_left_loop:
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lda PHYSICIST_X
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cmp (DOOR_X),Y
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bcc recalc_walk_left_continue ; blt
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; only if on same level
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lda (DOOR_Y),Y
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clc
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adc #4
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cmp PHYSICIST_Y
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bne recalc_walk_left_continue
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; only if closer than previous found
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lda (DOOR_X),Y
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ora #$80
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cmp LEFT_WALK_LIMIT
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bcc recalc_walk_left_continue ; blt
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lda (DOOR_STATUS),Y
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cmp #DOOR_STATUS_LOCKED
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bne recalc_walk_left_continue
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; early exit
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lda (DOOR_X),Y
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ora #$80
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sta LEFT_WALK_LIMIT
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; jmp done_recalc_walk_left_collision
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recalc_walk_left_continue:
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dey
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bpl recalc_walk_left_loop
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done_recalc_walk_left_collision:
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ldy #0
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recalc_walk_right_loop:
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; only if on same level
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lda (DOOR_Y),Y
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clc
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adc #4
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cmp PHYSICIST_Y
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bne recalc_walk_right_continue
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lda PHYSICIST_X
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cmp (DOOR_X),Y
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bcs recalc_walk_right_continue ; bge
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; only if closer than previous found
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lda (DOOR_X),Y
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ora #$80
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cmp RIGHT_WALK_LIMIT
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bcs recalc_walk_right_continue ; bge
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lda (DOOR_STATUS),Y
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cmp #DOOR_STATUS_LOCKED
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bne recalc_walk_right_continue
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; early exit
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lda (DOOR_X),Y
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sec
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sbc #4
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ora #$80
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sta RIGHT_WALK_LIMIT
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jmp done_recalc_walk_right_collision
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recalc_walk_right_continue:
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iny
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cpy NUM_DOORS
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bne recalc_walk_right_loop
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done_recalc_walk_right_collision:
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rts
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;=============================
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;=============================
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; calc_gun_right_collision
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;=============================
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;=============================
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; far right limit is LEVEL_RIGHT
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; any LOCKED or CLOSED doors with SAME_Y to left of LEVEL_RIGHT
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; any shield stops things
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; our friend stops things
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; any enemies stop things
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calc_gun_right_collision:
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lda #$00
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sta RIGHT_SHOOT_TARGET
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;=====================================================================
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; by default set it to left limit (which is often but not always a wall)
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lda RIGHT_LIMIT
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and #$7f
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sta RIGHT_SHOOT_LIMIT
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;===========================
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; stop if hit door
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calc_gun_right_door:
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lda NUM_DOORS
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beq done_calc_gun_right_door_collision
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calc_gun_right_doors:
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ldy #0
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calc_gun_right_door_loop:
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; only if on same level
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lda (DOOR_Y),Y
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clc
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adc #4
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cmp COLLISION_Y
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bne calc_gun_right_door_continue
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lda COLLISION_X
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cmp (DOOR_X),Y
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bcs calc_gun_right_door_continue ; bge
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lda (DOOR_STATUS),Y
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cmp #DOOR_STATUS_LOCKED
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beq calc_gun_right_door_there
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cmp #DOOR_STATUS_CLOSED
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bne calc_gun_right_door_continue
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calc_gun_right_door_there:
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; early exit
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lda (DOOR_X),Y
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sta RIGHT_SHOOT_LIMIT
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tya ; set target if hit
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ora #TARGET_DOOR
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sta RIGHT_SHOOT_TARGET
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jmp done_calc_gun_right_door_collision
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calc_gun_right_door_continue:
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iny
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cpy NUM_DOORS
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bne calc_gun_right_door_loop
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done_calc_gun_right_door_collision:
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;==========================
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; adjust for shield
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calc_gun_right_shield:
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lda SHIELD_OUT
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beq done_calc_gun_right_shield_collision
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ldx #0
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calc_gun_right_shield_loop:
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; FIXME: check for on same level?
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lda shield_out,X
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beq calc_gun_right_shield_continue
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lda COLLISION_X
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cmp shield_x,X
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bcs calc_gun_right_shield_continue ; bge
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; be sure closer than current max limit
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lda RIGHT_SHOOT_LIMIT
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cmp shield_x,X
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bcc calc_gun_right_shield_continue ; blt
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calc_gun_right_shield_there:
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lda shield_x,X
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sta RIGHT_SHOOT_LIMIT
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txa ; set target if hit
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ora #TARGET_SHIELD
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sta RIGHT_SHOOT_TARGET
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; can't early exit
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calc_gun_right_shield_continue:
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inx
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cpx #MAX_SHIELDS
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bne calc_gun_right_shield_loop
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done_calc_gun_right_shield_collision:
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;==========================
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; adjust for friend
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calc_gun_right_friend:
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lda friend_room
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cmp WHICH_ROOM
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bne done_calc_gun_right_friend_collision
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lda COLLISION_X
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cmp friend_x
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bcs calc_gun_right_friend_continue ; bge
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; only if closer than previous found
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lda RIGHT_SHOOT_LIMIT
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cmp friend_x
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bcc calc_gun_right_friend_continue ; blt
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lda friend_state
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cmp #F_DISINTEGRATING
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beq calc_gun_right_friend_continue
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calc_gun_right_friend_there:
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; early exit
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lda friend_x
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sta RIGHT_SHOOT_LIMIT
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; set target if hit
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lda #TARGET_FRIEND
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sta RIGHT_SHOOT_TARGET
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calc_gun_right_friend_continue:
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done_calc_gun_right_friend_collision:
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;==========================
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; adjust for physicist
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calc_gun_right_physicist:
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lda COLLISION_X
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cmp PHYSICIST_X
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bcs calc_gun_right_physicist_continue ; bge
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; only if closer than previous found
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lda RIGHT_SHOOT_LIMIT
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cmp PHYSICIST_X
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bcc calc_gun_right_physicist_continue ; blt
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lda PHYSICIST_STATE
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cmp #P_DISINTEGRATING
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beq calc_gun_right_physicist_continue
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calc_gun_right_physicist_there:
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lda PHYSICIST_X
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sta RIGHT_SHOOT_LIMIT
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; set target if hit
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lda #TARGET_PHYSICIST
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sta RIGHT_SHOOT_TARGET
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calc_gun_right_physicist_continue:
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done_calc_gun_right_physicist_collision:
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;==========================
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; adjust for alien
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calc_gun_right_alien:
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lda ALIEN_OUT
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beq done_calc_gun_right_alien_collision
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ldx #0
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calc_gun_right_alien_loop:
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lda alien_room,X
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cmp WHICH_ROOM
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bne calc_gun_right_alien_continue
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; only if on same level
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lda alien_y,X
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cmp COLLISION_Y
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bne calc_gun_right_alien_continue
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lda COLLISION_X
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cmp alien_x,X
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bcs calc_gun_right_alien_continue ; bge
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; only if closer than previous found
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lda RIGHT_SHOOT_LIMIT
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cmp alien_x,X
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bcc calc_gun_right_alien_continue ; blt
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lda alien_state,X
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cmp #A_DISINTEGRATING
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beq calc_gun_right_alien_continue
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calc_gun_right_alien_there:
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lda alien_x,X
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sta RIGHT_SHOOT_LIMIT
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txa ; set target if hit
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ora #TARGET_ALIEN
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sta RIGHT_SHOOT_TARGET
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; can't early exit
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calc_gun_right_alien_continue:
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inx
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cpx #MAX_ALIENS
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bne calc_gun_right_alien_loop
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done_calc_gun_right_alien_collision:
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rts
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;=============================
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;=============================
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; calc_gun_left_collision
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;=============================
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;=============================
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; far right limit is LEVEL_LEFT
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; any LOCKED or CLOSED doors stop things
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; any shield stops things
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; our friend stops things
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; any enemies stop things
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calc_gun_left_collision:
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lda #0
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sta LEFT_SHOOT_TARGET
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;=============================
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; by default set to left limit
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; tricky as LEFT_LIMIT does some hacks to put it up above $80
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lda LEFT_LIMIT
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sec
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sbc #$80
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bpl left_limit_ok
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lda #0
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left_limit_ok:
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sta LEFT_SHOOT_LIMIT
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;==========================
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; stop if hit door
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calc_gun_left_door:
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lda NUM_DOORS
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beq done_calc_gun_left_door_collision
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calc_gun_left_doors:
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ldy NUM_DOORS
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dey
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calc_gun_left_door_loop:
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; only if on same level
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lda (DOOR_Y),Y
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clc
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adc #4
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cmp COLLISION_Y
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bne calc_gun_left_door_continue
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lda COLLISION_X
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cmp (DOOR_X),Y
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bcc calc_gun_left_door_continue ; blt
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lda (DOOR_STATUS),Y
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cmp #DOOR_STATUS_LOCKED
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beq calc_gun_left_door_there
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cmp #DOOR_STATUS_CLOSED
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bne calc_gun_left_door_continue
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calc_gun_left_door_there:
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; early exit
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lda (DOOR_X),Y
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sta LEFT_SHOOT_LIMIT
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tya ; set target if hit
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ora #TARGET_DOOR
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sta LEFT_SHOOT_TARGET
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jmp done_calc_gun_left_door_collision
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calc_gun_left_door_continue:
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dey
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bpl calc_gun_left_door_loop
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done_calc_gun_left_door_collision:
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;==========================
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; adjust for shield
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calc_gun_left_shield:
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lda SHIELD_OUT
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beq done_calc_gun_left_shield_collision
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ldx #0
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calc_gun_left_shield_loop:
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; if shield not out, skip
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lda shield_out,X
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beq calc_gun_left_shield_continue
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; if current wall is closer, skip
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lda COLLISION_X
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cmp shield_x,X
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bcc calc_gun_left_shield_continue ; blt
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; be sure closer than current max limit
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lda LEFT_SHOOT_LIMIT
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cmp shield_x,X
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bcs calc_gun_left_shield_continue ; bge
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calc_gun_left_shield_there:
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lda shield_x,X
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sta LEFT_SHOOT_LIMIT
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txa ; set target if hit
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ora #TARGET_SHIELD
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sta LEFT_SHOOT_TARGET
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; can't early exit
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calc_gun_left_shield_continue:
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inx
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cpx #MAX_SHIELDS
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bne calc_gun_left_shield_loop
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done_calc_gun_left_shield_collision:
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;==========================
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; adjust for friend
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calc_gun_left_friend:
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lda friend_room
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cmp WHICH_ROOM
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bne done_calc_gun_left_friend_collision
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lda COLLISION_X
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cmp friend_x
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bcc calc_gun_left_friend_continue ; blt
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; only if closer than previous found
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lda LEFT_SHOOT_LIMIT
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cmp friend_x
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bcs calc_gun_left_friend_continue ; bge
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lda friend_state
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cmp #F_DISINTEGRATING
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beq calc_gun_left_friend_continue
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calc_gun_left_friend_there:
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lda friend_x
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sta LEFT_SHOOT_LIMIT
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; set target if hit
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lda #TARGET_FRIEND
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sta LEFT_SHOOT_TARGET
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calc_gun_left_friend_continue:
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done_calc_gun_left_friend_collision:
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;==========================
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; adjust for physicist
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calc_gun_left_physicist:
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lda COLLISION_X
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cmp PHYSICIST_X
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beq calc_gun_left_physicist_continue ; ble (not w self)
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bcc calc_gun_left_physicist_continue ; blt
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; only if closer than previous found
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lda LEFT_SHOOT_LIMIT
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cmp PHYSICIST_X
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bcs calc_gun_left_physicist_continue ; bge
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lda PHYSICIST_STATE
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cmp #P_DISINTEGRATING
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beq calc_gun_left_physicist_continue
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calc_gun_left_physicist_there:
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lda PHYSICIST_X
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sta LEFT_SHOOT_LIMIT
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; set target if hit
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lda #TARGET_PHYSICIST
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sta LEFT_SHOOT_TARGET
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calc_gun_left_physicist_continue:
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done_calc_gun_left_physicist_collision:
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;==========================
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; adjust for alien
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calc_gun_left_alien:
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lda ALIEN_OUT
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beq done_calc_gun_left_alien_collision
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ldx #MAX_ALIENS
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dex
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calc_gun_left_alien_loop:
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lda alien_room,X
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cmp WHICH_ROOM
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bne calc_gun_left_alien_continue
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; only if on same level
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lda alien_y,X
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cmp COLLISION_Y
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bne calc_gun_left_alien_continue
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lda COLLISION_X
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cmp alien_x,X
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beq calc_gun_left_alien_continue ; if exact equal
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; might be ourselves
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bcc calc_gun_left_alien_continue ; blt
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; only if closer than previous found
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lda LEFT_SHOOT_LIMIT
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cmp alien_x,X
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bcs calc_gun_left_alien_continue ; bge
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lda alien_state,X
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cmp #A_DISINTEGRATING
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beq calc_gun_left_alien_continue
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calc_gun_left_alien_there:
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; early exit
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lda alien_x,X
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sta LEFT_SHOOT_LIMIT
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txa ; set target if hit
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ora #TARGET_ALIEN
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sta LEFT_SHOOT_TARGET
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jmp done_calc_gun_left_alien_collision
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calc_gun_left_alien_continue:
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dex
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bpl calc_gun_left_alien_loop
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done_calc_gun_left_alien_collision:
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rts
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