;; LOAD OBJECT 00
;; OUTER LOOP
;; CHECK IF ACTIVE, IF NOT, SKIP OBJECT
;; LOAD self-collision-box
;; START OBJECT COLLISION LOOP
;; LDA ONE MORE THAN CURRENT OBJECT
;; CHECK IF ACTIVE. IF NOT, SKIP THIS other
;; IF IT IS ACTIVE, then we have to play them against each other.
;; IS self object hurt by monsters? If so, and other object is a monster, respond.
;; IS self object hurt by weapons? If so, and other object is a weapon, respond.
;; at this point, we can still gauge whether or not it's affected by player, like with powerups.
;; ADD one to the object being checked, loop through other objects.
;; increase object, return to outer loop. Repeat thorugh all self objects.
;; ObjectFlags:
;; 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0
; | | | | | | | + -- PERSISTENT (especially good for player!)
; | | | | | | +------- player type
; | | | | | + ---------- player weapon/projectile type
; | | | | +--------------- monster type
; | | | +------------------- monster weapon/projectile type
; | | +----------------------- pickup / power up
; | + -------------------------- target type
; +------------------------------- NPC type
;; player type checks monster, mosnter weapon, and pickup.
;; player weapon checks monster and target.
;; nothing else needs checking, as it would all be handled by those two steps.
;; so if it's a monster, do nothing. if it's a monster projectile, do nothing.
;; if it's a pickup, or a target, or it ignores all collisions, do nothing.
;; only if it's #%00000110, do something.
HandleObjectCollisions:
LDA update_screen
BEQ notChangingScreens
rts
notChangingScreens:
LDA npc_collision
AND #%11111110
STA npc_collision
;LDA currentBank
;STA prevBank
;LDY #BANK_ANIMS
;JSR bankswitchY
LDX #$00
CollisionOuterLoop:
TXA
STA tempx
LDA Object_status,x
AND #%10000000
BNE continueObjectCollisions_objectIsActive
JMP doneWithThisObjectCollision
continueObjectCollisions_objectIsActive:
LDA Object_status,x
AND #%00000100 ;; is ot off screen
BEQ continueObjectCollisions_objectIsOnScreen
JMP doneWithThisObjectCollision
continueObjectCollisions_objectIsOnScreen
LDA Object_status,x
AND #%00000011
BEQ continueObjectCollisions_objectIsNotHurtOrInvincible
JMP doneWithThisObjectCollision
continueObjectCollisions_objectIsNotHurtOrInvincible
;LDY Object_type,x
;LDA ObjectFlags,y
LDA Object_flags,x
AND #%00000110
BNE continueObjectCollisions_onlyPlayerTypesCheck
JMP doneWithThisObjectCollision
continueObjectCollisions_onlyPlayerTypesCheck:
;; this is either a player or player projectile type of object.
;; all other types will be taken care of by iterating through these two types.
;; first, check if it's player type.
;LdA ObjectFlags,y
LDA Object_flags,x
AND #%00000010
BNE isPlayerTypeForCollision
JMP notPlayerType_forObjectCollision
isPlayerTypeForCollision:
LDA player1_object
STA colX
;; is player type for object collision
;; player's index is loaded into tempx
JSR GetSelfCollisionBox
;; now we have the collision box for self object
;; next we loop through objects.
LDX #$00
LoopThroughOtherObjects_player:
CPX tempx
BNE dontSkipThisOtherObject
JMP skipThisOtherObject ;; other object IS the player, the one doing the counting..
dontSkipThisOtherObject:
LDA Object_status,x
AND #%00000100
BEQ dontSkipThisOtherObject_becauseOnScreen
JMP skipThisOtherObject ;; because it was off screen.
dontSkipThisOtherObject_becauseOnScreen:
JSR GetOtherCollisionBox
;; now we can do all the compares
LDA selfNT_R
CMP otherNT_L
BCC + ;; no player object collision
BNE ++ ;; is still possible to see collision.
LDA selfRight
CMP otherLeft
BCC + ;; no player object collision
++ ;; it is still possible there is a collision here.
LDA otherNT_R
CMP selfNT_L
BCC +
BNE +++
LDA otherRight
CMP selfLeft
BCC +
+++ ;; there was a collision here
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
LDA otherBottom
CMP selfTop
BCC +
LDA selfBottom
CMP otherTop
BCC +
JMP DoPlayerObjectCollision
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ ;; there is no collision here horizontally.
JMP noPlayerObjectCollision
DoPlayerObjectCollision:
LDA Object_flags,x
AND #%10000000 ;; is it an NPC
BNE isAnNPC
;; is not an NPC
JMP isNotAnNPCcollision
isAnNPC:
;;;; do npc stuff.
LDA npc_collision
ORA #%00000001
STA npc_collision
;;;; enables a button to be used to activate a textbox.
LDA Object_ID,x
STA textVar
;LDA gameHandler
;ORA #%00100000
;STA gameHandler
JMP skipThisOtherObject
isNotAnNPCcollision:
LDA Object_flags,x
;LDA ObjectFlags,y
AND #%00011000 ;; is it a monster type?
BNE otherIsAMonsterTypeCollision
JMP otherIsNotAMonsterTypeCollision
otherIsAMonsterTypeCollision:
LDA Object_status,x
AND #HURT_STATUS_MASK ;; if the monster is hurt, it can't hurt us
BEQ yesPlayerObjectCollision
JMP noPlayerObjectCollision
yesPlayerObjectCollision:
LDA Object_vulnerability,x
AND #%00000010 ;; in this module, this is ignore player collision
BEQ doPlayerHurt
JMP noPlayerObjectCollision
doPlayerHurt:
;;;observe health
TXA
STA tempx ;; object is in tempx.
LDX player1_object
LDA Object_status,x
AND #HURT_STATUS_MASK
BEQ playerWasNotHurtDuringCollision
JMP playerWasHurtDuringCollision
playerWasNotHurtDuringCollision:
LDA Object_vulnerability,x
AND #%01000000 ;; is he lethal invincible?
BNE isLethalInvincible
JMP notLethalInvincible
isLethalInvincible:
LDX tempx
LDA Object_x_hi,x
STA temp
LDA Object_y_hi,x
STA temp1
CreateObject temp, temp1, #OBJ_MONSTER_DEATH, #$00, currentNametable ;; create "splat"
LDX tempx
;;; ordinarily we'll want to destroy the instance.
; DeactivateCurrentObject
;; incrase score, you killed a monster
;PlaySound #SND_SPLAT
;TXA
;STA tempx
;AddValue #$08, myScore, #$01, #$00
;;; we also need to set up the routine to update the HUD
;; for this to work right, health must be a "blank-then-draw" type element.
;STA hudElementTilesToLoad
; LDA #$00
; STA hudElementTilesMax
; LDA DrawHudBytes
; ora #HUD_myScore
; STA DrawHudBytes
;UpdateHud HUD_myScore
;LDX tempx
;;
;; check for monter locks begin:
CountObjects #%00001000, #$00
LDA monsterCounter
CLC
BEQ +
JMP ++
+
.include SCR_KILLED_LAST_MONSTER
;; check for monter locks end.
++
JMP skipThisOtherObject
notLethalInvincible:
;;;;;;;;;;;;;;;;;
;;;;;;;;; WHAT HAPPENS WHEN PLAYER IS HURT
.include SCR_PLAYER_HURT_SCRIPT
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
playerWasHurtDuringCollision:
LDX tempx
JMP skipThisOtherObject
otherIsNotAMonsterTypeCollision:
;LDA ObjectFlags,y
LDA Object_flags,x
AND #%00100000 ;; is it a 'collectable'?
BEQ otherIsNotAcollectable
;;;; IS A pickup / power up
DeactivateCurrentObject ;; makes the other object go away
;; since other object is loaded in X
;;=========== WHAT DO YOU WANT TO HAVE HAPPEN WHEN YOU COLLECT THIS ITEM?
JSR HandlePickupPowerup
otherIsNotAcollectable:
noPlayerObjectCollision:
skipThisOtherObject:
INX
CPX #TOTAL_MAX_OBJECTS
BEQ doneLoopThroughOtherObjects_player
JMP LoopThroughOtherObjects_player
doneLoopThroughOtherObjects_player:
;; end of player collision
LDX tempx ;; restore x
JMP doneWithThisObjectCollision
notPlayerType_forObjectCollision:
;; is of player weapon type.
JSR GetSelfCollisionBox
;; now we have the collision box for self object
;; next we loop through objects.
LDX #$00
LoopThroughOtherObjects_weapon:
CPX tempx
BNE dontskipThisOtherObject_weapon
JMP skipThisOtherObject_weapon
dontskipThisOtherObject_weapon
JSR GetOtherCollisionBox
;; now we can do all the compares
LDA selfNT_R
CMP otherNT_L
BCC + ;; no player object collision
BNE ++ ;; is still possible to see collision.
LDA selfRight
CMP otherLeft
BCC + ;; no player object collision
++ ;; it is still possible there is a collision here.
LDA otherNT_R
CMP selfNT_L
BCC +
BNE +++
LDA otherRight
CMP selfLeft
BCC +
+++ ;; there was a collision here
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
LDA otherBottom
CMP selfTop
BCC +
LDA selfBottom
CMP otherTop
BCC +
JMP doWeaponObjectCollision
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ ;; there is no collision here horizontally.
JMP noWeaponObjectCollision
doWeaponObjectCollision:
;; go through the different types of collision possible.
;; first, check monster OR monser projectile, as that should lead to hurt/death
;LDY Object_type,x
;LDA ObjectFlags,y
LDA Object_flags,x
AND #%00001000 ;; is it a monster type?
;;; if you'd like the player weapon to ALSO destroy projectiles
;;; use #%00011000 here
BNE otherIsMonsterTypeCollision_weapon
JMP otherIsNotAMonsterTypeCollision_weapon
otherIsMonsterTypeCollision_weapon:
;;;;;;;;;;;;;;;;;;;;;;;;
TXA
PHA
.include SCR_HANDLE_HURT_MONSTER
PLA
TAX
;;; if monster dies, count monsters
;; right now, he always dies, so count the monsters.
;JSR countAllMonsters
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;JMP doneWithThisObjectCollision ;;DC
otherIsNotAMonsterTypeCollision_weapon:
noWeaponObjectCollision:
skipThisOtherObject_weapon:
INX
CPX #TOTAL_MAX_OBJECTS
BEQ doneWithLoopingThroughWeaponObjects
JMP LoopThroughOtherObjects_weapon
doneWithLoopingThroughWeaponObjects:
;; end of player collision
LDX tempx ;; restore x
JMP doneWithThisObjectCollision
doneWithThisObjectCollision:
LDX tempx
INX
CPX #TOTAL_MAX_OBJECTS
BEQ doneWithAllObjects
JMP CollisionOuterLoop
doneWithAllObjects:
;;;;;;;;;;;;;;;;;;;;;;;;;
;; for this module
;; we will check for the melee position.
;; but rather than waste space with an entire object
;; we'll just test it against a single point
.include SCR_CHECK_SPRITE_WEAPON
RTS
GetSelfCollisionBox:
LDA Object_x_hi,x
CLC
ADC Object_left,x
STA selfLeft
LDA Object_scroll,x
ADC #$00
STA selfNT_L
LDA Object_x_hi,x
CLC
ADC Object_right,x
STA selfRight
LDA Object_scroll,x
ADC #$00
STA selfNT_R
LDA Object_vulnerability,x
AND #%10000000
BEQ noDuckingBit
LDA Object_bottom,x
SEC
SBC Object_top,x
LSR
STA temp
LDA Object_y_hi,x
CLC
ADC temp
JMP gotSelfTop
noDuckingBit:
LDA Object_y_hi,x
CLC
ADC Object_top,x
gotSelfTop:
STA selfTop
LDA Object_y_hi,x
CLC
ADC Object_bottom,x
STA selfBottom
LDA Object_x_hi,x
CLC
ADC Object_origin_x,x
STA selfCenterX
LDA Object_y_hi,x
CLC
ADC Object_origin_y,x
STA selfCenterY
RTS
GetOtherCollisionBox:
LDA Object_x_hi,x
CLC
ADC Object_left,x
STA otherLeft
LDA Object_scroll,x
ADC #$00
STA otherNT_L
LDA Object_x_hi,x
CLC
ADC Object_right,x
STA otherRight
LDA Object_scroll,x
ADC #$00
STA otherNT_R
LDA Object_vulnerability,x
AND #%10000000
BEQ noDuckingBit_other
LDA Object_bottom,x
SEC
SBC Object_top
LSR
STA temp
LDA Object_y_hi,x
CLC
ADC temp
JMP gotSelfTop_other
noDuckingBit_other:
LDA Object_y_hi,x
CLC
ADC Object_top,x
gotSelfTop_other:
STA otherTop
LDA Object_y_hi,x
CLC
ADC Object_bottom,x
STA otherBottom
LDA Object_x_hi,x
CLC
ADC Object_origin_x,x
STA otherCenterX
LDA Object_y_hi,x
CLC
ADC Object_origin_y,x
STA otherCenterY
RTS
DetermineRecoilDirection:
;;;RECOIL
;;First check for the abs x value
LDA recoil_selfX
SEC
SBC recoil_otherX
BCS absCheckDone
EOR #$FF
CLC
ADC #$01
absCheckDone:
STA temp
LDA recoil_selfY
SEC
SBC recoil_otherY
BCS absCheckDone2
EOR #$FF
CLC
ADC #$01
absCheckDone2:
CMP temp
BCS vCol
LDA recoil_selfX
CMP recoil_otherX
BCS recoilRight
;; recoil left
;LDX #$01
LDA #RECOIL_SPEED_LO
STA Object_h_speed_lo,x
LDA #$00
SEC
SBC #RECOIL_SPEED_HI
STA Object_h_speed_hi,x
LDA #$00
STA Object_v_speed_hi,x
STA Object_v_speed_lo,x
LDA #%10000000
STA temp1
LDA Object_movement,x
AND #%00000111
ORA temp1
STA Object_movement,x
CPX player1_object
BNE dontChangeScrollDirectionL
LDA #$00
STA scrollDirection
dontChangeScrollDirectionL
RTS
recoilRight:
;LDX #$01
LDA #RECOIL_SPEED_LO
STA Object_h_speed_lo,x
LDA #RECOIL_SPEED_HI
STA Object_h_speed_hi,x
LDA #$00
STA Object_v_speed_hi,x
STA Object_v_speed_lo,x
LDA #%11000000
STA temp1
LDA Object_movement,x
AND #%00000111
ORA temp1
STA Object_movement,x
CPX player1_object
BNE dontChangeScrollDirectionR
LDA #$01
STA scrollDirection
dontChangeScrollDirectionR:
RTS
vCol:
LDA recoil_selfY
CMP recoil_otherY
BCS recoilDown
;LDX #$01
LDA #RECOIL_SPEED_LO
STA Object_v_speed_lo,x
LDA #$00
SEC
SBC #RECOIL_SPEED_HI
STA Object_v_speed_hi,x
LDA #%00100000
STA temp1
LDA #$00
STA Object_h_speed_hi,x
STA Object_h_speed_lo,x
LDA Object_movement,x
AND #%00000111
ORA temp1
STA Object_movement,x
RTS
recoilDown:
;LDX #$01
LDA #RECOIL_SPEED_LO
STA Object_v_speed_lo,x
LDA #RECOIL_SPEED_HI
STA Object_v_speed_hi,x
LDA #%00110000
STA temp1
LDA #$00
STA Object_h_speed_hi,x
STA Object_h_speed_lo,x
LDA Object_movement,x
AND #%00000111
ORA temp1
STA Object_movement,x
RTS
