GSCats/projectile.s

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;
; projectile
; Code and data structures related to the projectiles
;
; Created by Quinn Dunki on 8/13/17
;
projectileData:
; gameobject data (we're a subclass, effectively)
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.word -1 ; Pos X in pixels (from left terrain edge)
.word 0 ; Pos Y in pixels (from bottom terrain edge)
.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ; Saved background
.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.word 0 ; Pos X (12.4 fixed point)
.word 0 ; Pos Y (12.4 fixed point)
.word 0 ; Velocity X (8.8 fixed point)
.word 0 ; Velocity Y (8.8 fixed point)
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.word 0 ; Type
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.word 1 ; New?
.repeat 112
.byte 0 ; Padding to 256-byte boundary
.endrepeat
JD_PRECISEX = 132 ; Byte offsets into projectile data structure
JD_PRECISEY = 134
JD_VX = 136
JD_VY = 138
JD_TYPE = 140
JD_NEW = 142
GRAVITY = $ffff ; 8.8 fixed point
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projectileTypes: ; Byte offsets into projectile type data structure
.word 50 ; Damage
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.word 40 ; Crater radius
.word 0,0 ; Padding
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PT_DAMAGE = 0
PT_RADIUS = 2
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.macro PROJECTILEPTR_Y
tya ; Pointer to projectile structure from index
asl
asl
asl
asl
asl
asl
asl
asl
tay
.endmacro
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.macro PROJECTILETYPEPTR_Y
tya ; Pointer to projectile type structure from index
asl
asl
tay
.endmacro
projectileParams:
.word 0 ; Starting pos X
.word 0 ; Starting pos Y
.word 0 ; Initial angle
.word 0 ; Initial power
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; fireProjectile
;
; Trashes SCRATCHL
;
fireProjectile:
SAVE_AXY
; Set up projectile structure
ldy #0 ; Only one active at a time for now
PROJECTILEPTR_Y
lda projectileParams ; X pos
sta projectileData+GO_POSX,y
lda projectileParams+2 ; Y pos
sta projectileData+GO_POSY,y
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lda projectileParams ; Fixed point version of X pos
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asl
asl
asl
asl
sta projectileData+JD_PRECISEX,y
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lda projectileParams+2 ; Fixed point version of Y pos
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asl
asl
asl
asl
sta projectileData+JD_PRECISEY,y
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lda projectileParams+6 ; Convert power to 8.8
asl
asl
asl
asl
asl
asl
asl
asl
sta projectileParams+6
lda projectileParams+4 ; Convert angle to vector
asl
tax
lda angleToVectorX,x ; Velocity X (unit vector)
sta PARAML1
lda projectileParams+6 ; Scale by power
sta PARAML0
jsr mult88
sta projectileData+JD_VX,y
lda projectileParams+4 ; Convert angle to vector
asl
tax
lda angleToVectorY,x ; Velocity Y (unit vector)
sta PARAML1
lda projectileParams+6 ; Scale by power
sta PARAML0
jsr mult88
sta projectileData+JD_VY,y
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lda #1
sta projectileData+JD_NEW,y
stz projectileActive
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RESTORE_AXY
rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; updateProjectilePhysics
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;
; Trashes SCRATCHL
;
updateProjectilePhysics:
SAVE_AY
lda projectileData+GO_POSX
bpl updateProjectilePhysicsActive
jmp updateProjectilePhysicsDone
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updateProjectilePhysicsActive:
; Integrate gravity over velocity
lda projectileData+JD_VY
clc
adc #GRAVITY
sta projectileData+JD_VY
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; Integrate X velocity over position
lda projectileData+JD_VX
; Convert 8.8 to 12.4
cmp #$8000
ror
cmp #$8000
ror
cmp #$8000
ror
cmp #$8000
ror
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clc
adc projectileData+JD_PRECISEX
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sta projectileData+JD_PRECISEX
; Convert to integral for rendering
lsr
lsr
lsr
lsr
sta projectileData+GO_POSX
bmi updateProjectilePhysicsDelete
cmp #TERRAINWIDTH-GAMEOBJECTWIDTH-1
bpl updateProjectilePhysicsDelete
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updateProjectilePhysicsContinue:
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; Integrate Y velocity over position
lda projectileData+JD_VY
; Convert 8.8 to 12.4
cmp #$8000
ror
cmp #$8000
ror
cmp #$8000
ror
cmp #$8000
ror
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clc
adc projectileData+JD_PRECISEY
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sta projectileData+JD_PRECISEY
; Convert to integral for rendering
lsr
lsr
lsr
lsr
sta projectileData+GO_POSY
cmp #GAMEOBJECTHEIGHT
bmi updateProjectilePhysicsDelete
updateProjectilePhysicsDone:
RESTORE_AY
rts
updateProjectilePhysicsDelete:
jsr endProjectile
bra updateProjectilePhysicsDone
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; updateProjectileCollisions
;
; Trashes SCRATCHL
;
updateProjectileCollisions:
SAVE_AY
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; Check for player collisions
ldy #0
lda projectileData+GO_POSX
bmi updateProjectileCollisionsDone ; Projectile not active
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sta rectParams
lda projectileData+GO_POSY
sta rectParams+2
lda #GAMEOBJECTWIDTH
sta rectParams+4
lda #GAMEOBJECTHEIGHT
sta rectParams+6
updateProjectileCollisionsPlayerLoop:
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cpy currentPlayer
beq updateProjectileCollisionsPlayerNext
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jsr playerIntersectRect
cmp #0
bne updateProjectileCollisionsPlayerHit
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updateProjectileCollisionsPlayerNext:
iny
cpy #NUMPLAYERS
bne updateProjectileCollisionsPlayerLoop
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; Check for terrain collisions
lda projectileData+GO_POSX
sta rectParams
lda projectileData+GO_POSY
sta rectParams+2
lda #GAMEOBJECTWIDTH
sta rectParams+4
lda #GAMEOBJECTHEIGHT
sta rectParams+6
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jsr intersectRectTerrain
cmp #0
bne updateProjectileCollisionsTerrainHit
updateProjectileCollisionsDone:
RESTORE_AY
rts
updateProjectileCollisionsPlayerHit:
jsr processPlayerImpact
jsr endProjectile
bra updateProjectileCollisionsDone
updateProjectileCollisionsTerrainHit:
jsr processTerrainImpact
jsr endProjectile
bra updateProjectileCollisionsDone
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; endProjectile
;
; Trashes A and Y
;
endProjectile:
UNRENDER_GAMEOBJECT projectileData
ldy #0
jsr deleteProjectile
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lda #1
sta turnRequested
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lda #-1
sta projectileActive
rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; deleteProjectile
;
; Y = Projectile index
; Trashes A
;
deleteProjectile:
PROJECTILEPTR_Y
lda #-1
sta projectileData+GO_POSX,y
rts
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; renderProjectiles
;
;
renderProjectiles:
pha
lda projectileData
bpl renderProjectilesDoIt
jmp renderProjectilesDone
renderProjectilesDoIt:
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RENDER_GAMEOBJECT projectileData,1
renderProjectilesDone:
pla
rts
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; unrenderProjectiles
;
;
unrenderProjectiles:
pha
lda projectileData
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bpl unrenderProjectilesActive
jmp unrenderProjectilesDone
unrenderProjectilesActive:
lda projectileData+JD_NEW
beq unrenderProjectilesDoIt
stz projectileData+JD_NEW
jmp unrenderProjectilesDone
unrenderProjectilesDoIt:
UNRENDER_GAMEOBJECT projectileData
unrenderProjectilesDone:
pla
rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; processPlayerImpact
;
; Y = Index of player that was hit
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;
processPlayerImpact:
PLAYERPTR_Y
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tyx
ldy #0 ; Assume projectile 0
PROJECTILEPTR_Y
lda projectileData+JD_TYPE,y
tay
PROJECTILETYPEPTR_Y
; Apply damage
lda playerData+PD_ANGER,x
sec
sbc projectileTypes+PT_DAMAGE,y
; Check for death
beq processPlayerImpactDeath
bmi processPlayerImpactDeath
sta playerData+PD_ANGER,x
rts
processPlayerImpactDeath:
lda currentPlayer
sta gameOver
rts
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; processTerrainImpact
;
; Trashes A,Y
;
processTerrainImpact:
ldy #0 ; Assume projectile 0
PROJECTILEPTR_Y
lda projectileData+GO_POSX,y
clc
adc #GAMEOBJECTWIDTH/2
sta PARAML0
lda projectileData+GO_POSY,y
sec
sbc #GAMEOBJECTHEIGHT
sta PARAML1
lda projectileData+JD_TYPE,y
tay
PROJECTILETYPEPTR_Y
lda projectileTypes+PT_RADIUS,y
tay
jsr craterTerrain
jsr compileTerrain
jsr clipTerrain
rts