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https://github.com/blondie7575/GSCats.git
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979 lines
18 KiB
ArmAsm
979 lines
18 KiB
ArmAsm
;
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; projectile
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; Code and data structures related to the projectiles
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;
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; Created by Quinn Dunki on 8/13/17
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;
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projectileData:
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; Gameobject data (we're a subclass, effectively)
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.word -1 ; Pos X in pixels (from left terrain edge)
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.word 0 ; Pos Y in pixels (from bottom terrain edge)
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ; Saved background
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.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)
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.word 0 ; Pos Y (12.4 fixed point)
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.word 0 ; Velocity X (8.8 fixed point)
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.word 0 ; Velocity Y (8.8 fixed point)
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.word 0 ; Type
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.word 1 ; New?
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.word 0 ; Static?
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.word 0 ; Owner (player index)
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.word 0 ; Facing (0,1) = (+X,-X)
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.word 0 ; Scratch space for subclasses
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.word 0 ; Age (in turns)
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.word 0 ; Deployment delay needed?
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.repeat 100
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.byte 0 ; Padding to 256-byte boundary
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.endrepeat
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; Gameobject data (we're a subclass, effectively)
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.word -1 ; Pos X in pixels (from left terrain edge)
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.word 0 ; Pos Y in pixels (from bottom terrain edge)
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ; Saved background
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.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)
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.word 0 ; Pos Y (12.4 fixed point)
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.word 0 ; Velocity X (8.8 fixed point)
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.word 0 ; Velocity Y (8.8 fixed point)
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.word 0 ; Type
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.word 1 ; New?
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.word 0 ; Static?
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.word 0 ; Owner (player index)
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.word 0 ; Facing (0,1) = (+X,-X)
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.word 0 ; Scratch space for subclasses
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.word 0 ; Age (in turns)
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.repeat 102
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.byte 0 ; Padding to 256-byte boundary
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.endrepeat
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; Gameobject data (we're a subclass, effectively)
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.word -1 ; Pos X in pixels (from left terrain edge)
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.word 0 ; Pos Y in pixels (from bottom terrain edge)
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ; Saved background
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.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)
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.word 0 ; Pos Y (12.4 fixed point)
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.word 0 ; Velocity X (8.8 fixed point)
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.word 0 ; Velocity Y (8.8 fixed point)
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.word 0 ; Type
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.word 1 ; New?
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.word 0 ; Static?
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.word 0 ; Owner (player index)
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.word 0 ; Facing (0,1) = (+X,-X)
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.word 0 ; Scratch space for subclasses
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.word 0 ; Age (in turns)
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.repeat 102
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.byte 0 ; Padding to 256-byte boundary
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.endrepeat
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; Byte offsets for that-^ data structure can be found in equates.s
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GRAVITY = $fffa ; 8.8 fixed point
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projectileTypes:
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PT_SPIT = 0
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PT_BOMB = 1
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PT_FAN = 2
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; Spit
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.word 3 ; Damage
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.word 3 ; Crater radius
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.word 4 ; Frame 0
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.word 6 ; Frame 1
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.word 8 ; Frame 2
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.addr 0 ; Deploy
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.addr 0 ; Update
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.addr 0 ; Render
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.addr 0 ; Cleanup
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.word 1 ; Directional
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.word 1 ; Mining
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.repeat 10
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.byte 0 ; Padding to 32-byte boundary
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.endrepeat
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; Bomb
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.word 50 ; Damage
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.word 10 ; Crater radius
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.word 3 ; Frame 0
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.word 3 ; Frame 1
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.word 3 ; Frame 2
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.addr 0 ; Deploy
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.addr 0 ; Update
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.addr 0 ; Render
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.addr 0 ; Cleanup
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.word 0 ; Directional
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.word 0 ; Mining
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.repeat 10
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.byte 0 ; Padding to 32-byte boundary
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.endrepeat
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; Fan
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.word 3 ; Damage
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.word 3 ; Crater radius
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.word 12 ; Frame 0
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.word 12 ; Frame 1
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.word 12 ; Frame 2
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.addr deployFan ; Deploy
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.addr updateFan ; Update
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.addr renderFan ; Render
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.addr deleteFan ; Cleanup
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.word 1 ; Directional
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.word 0 ; Mining
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.repeat 10
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.byte 0 ; Padding to 32-byte boundary
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.endrepeat
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PT_DAMAGE = 0 ; Byte offsets into projectile type data structure
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PT_RADIUS = 2
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PT_FRAME0 = 4
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PT_FRAME1 = 6
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PT_FRAME2 = 8
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PT_DEPLOY = 10
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PT_UPDATE = 12
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PT_RENDER = 14
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PT_CLEANUP = 16
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PT_DIRECTIONAL = 18
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PT_MINING = 20
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.macro PROJECTILEPTR_Y
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tya ; Pointer to projectile structure from index
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asl
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asl
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asl
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asl
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asl
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asl
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asl
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asl
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tay
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.endmacro
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.macro PROJECTILETYPEPTR_Y
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tya ; Pointer to projectile type structure from index
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asl
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asl
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asl
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asl
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asl
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tay
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.endmacro
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.macro PROJECTILETYPEPTR_X
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txa ; Pointer to projectile type structure from index
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asl
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asl
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asl
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asl
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asl
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tax
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.endmacro
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projectileParams:
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.word 0 ; Starting pos X
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.word 0 ; Starting pos Y
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.word 0 ; Initial angle
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.word 0 ; Initial power
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.word 0 ; Type
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; allocProjectile
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;
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; Returns offset of projectile structure in Y, or -1 if none available
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;
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allocProjectile:
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SAVE_AX
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ldx #0
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allocProjectileLoop:
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txy
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PROJECTILEPTR_Y
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lda projectileData+GO_POSX,y
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bmi allocProjectileDone
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inx
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cpx #MAXPROJECTILES
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bne allocProjectileLoop
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ldy #-1
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allocProjectileDone:
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RESTORE_AX
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; fireProjectile
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;
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;
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fireProjectile:
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SAVE_AXY
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; Allocate a projectile
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jsr allocProjectile
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cpy #-1
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beq fireProjectileDone
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; Set up projectile structure
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lda projectileParams ; X pos
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sta projectileData+GO_POSX,y
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lda projectileParams+2 ; Y pos
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sta projectileData+GO_POSY,y
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lda #0
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sta projectileData+JD_STATIC,y
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sta projectileData+JD_AGE,y
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sty projectileActive
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lda currentPlayer
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sta projectileData+JD_OWNER,y
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; Set facing. For now assume player orientations are constant
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beq fireProjectilePosX
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lda #1
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sta projectileData+JD_FACING,y
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bra fireProjectileSetup
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fireProjectilePosX:
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lda #0
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sta projectileData+JD_FACING,y
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fireProjectileSetup:
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lda projectileParams ; Fixed point version of X pos
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asl
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asl
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asl
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asl
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sta projectileData+JD_PRECISEX,y
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lda projectileParams+2 ; Fixed point version of Y pos
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asl
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asl
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asl
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asl
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sta projectileData+JD_PRECISEY,y
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lda projectileParams+8 ; Type
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sta projectileData+JD_TYPE,y
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; Check for special deployment code
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phy
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tay ; Find projectile type data
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PROJECTILETYPEPTR_Y
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lda projectileTypes+PT_DEPLOY,y
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beq fireProjectileStandardDeploy
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ply
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JSRA
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bra fireProjectileFinish
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fireProjectileStandardDeploy:
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ply
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; Standard physics setup
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jsr prepareProjectilePhysics
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fireProjectileFinish:
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lda #1
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sta projectileData+JD_NEW,y
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fireProjectileDone:
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RESTORE_AXY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; prepareProjectilePhysics
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;
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; Y: Index to projectile structure
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;
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prepareProjectilePhysics:
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SAVE_AXY
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lda projectileParams+6 ; Convert power to 8.8
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asl
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asl
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asl
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asl
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asl
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asl
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asl
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asl
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sta projectileParams+6
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lda projectileParams+4 ; Convert angle to vector
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asl
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tax
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lda angleToVectorX,x ; Velocity X (unit vector)
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sta PARAML1
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lda projectileParams+6 ; Scale by power
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sta PARAML0
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jsr mult88
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sta projectileData+JD_VX,y
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lda projectileParams+4 ; Convert angle to vector
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asl
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tax
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lda angleToVectorY,x ; Velocity Y (unit vector)
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sta PARAML1
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lda projectileParams+6 ; Scale by power
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sta PARAML0
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jsr mult88
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sta projectileData+JD_VY,y
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RESTORE_AXY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; updateProjectilesPhysics
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;
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;
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updateProjectilesPhysics:
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SAVE_AXY
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ldx #0
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updateProjectilesPhysicsLoop:
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txy
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PROJECTILEPTR_Y
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jsr updateProjectilePhysics
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updateProjectilesPhysicsSkip:
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inx
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cpx #MAXPROJECTILES
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bne updateProjectilesPhysicsLoop
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RESTORE_AXY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; updateProjectilePhysics
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;
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; Y = Offset to projectile structure
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;
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updateProjectilePhysics:
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SAVE_AXY
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lda projectileData+GO_POSX,y
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bmi updateProjectilePhysicsDone ; Not allocated
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lda projectileData+JD_STATIC,y
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bne updateProjectilePhysicsSpecial ; Static
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updateProjectilePhysicsActive:
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; Integrate gravity over velocity
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lda projectileData+JD_VY,y
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clc
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adc #GRAVITY
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sta projectileData+JD_VY,y
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; Integrate X velocity over position
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lda projectileData+JD_VX,y
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; Convert 8.8 to 12.4
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cmp #$8000
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ror
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cmp #$8000
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ror
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cmp #$8000
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ror
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cmp #$8000
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ror
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clc
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adc projectileData+JD_PRECISEX,y
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adc globalWind ; Add wind
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sta projectileData+JD_PRECISEX,y
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; Convert to integer for rendering
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lsr
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lsr
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lsr
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lsr
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sta projectileData+GO_POSX,y
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bmi updateProjectilePhysicsDelete
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cmp #TERRAINWIDTH-GAMEOBJECTWIDTH-1
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bpl updateProjectilePhysicsDelete
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updateProjectilePhysicsContinue:
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; Integrate Y velocity over position
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lda projectileData+JD_VY,y
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; Convert 8.8 to 12.4
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cmp #$8000
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ror
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cmp #$8000
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ror
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cmp #$8000
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ror
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cmp #$8000
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ror
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clc
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adc projectileData+JD_PRECISEY,y
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sta projectileData+JD_PRECISEY,y
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; Convert to integer for rendering
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lsr
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lsr
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lsr
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lsr
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sta projectileData+GO_POSY,y
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cmp #GAMEOBJECTHEIGHT
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bmi updateProjectilePhysicsDelete
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updateProjectilePhysicsSpecial:
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; Check for special update code
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phy
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lda projectileData+JD_TYPE,y
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tay
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PROJECTILETYPEPTR_Y
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lda projectileTypes+PT_UPDATE,y
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beq updateProjectilePhysicsNormalUpdate
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ply
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JSRA
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updateProjectilePhysicsDone:
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RESTORE_AXY
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rts
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updateProjectilePhysicsDelete:
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jsr endDeleteCurrProjectile
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bra updateProjectilePhysicsDone
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updateProjectilePhysicsNormalUpdate:
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ply
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bra updateProjectilePhysicsDone
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; updateProjectilesCollisions
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;
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;
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updateProjectilesCollisions:
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SAVE_AXY
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ldx #0
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updateProjectilesCollisionsLoop:
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txy
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PROJECTILEPTR_Y
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jsr updateProjectileCollisions
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updateProjectilesCollisionsSkip:
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inx
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cpx #MAXPROJECTILES
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bne updateProjectilesCollisionsLoop
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RESTORE_AXY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; updateProjectileCollisions
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;
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; Y = Offset to projectile structure
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;
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updateProjectileCollisions:
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SAVE_AXY
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; Check for player collisions
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lda projectileData+JD_STATIC,y
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bne updateProjectileCollisionsDone ; Static
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lda projectileData+GO_POSX,y
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bmi updateProjectileCollisionsDone ; Not allocated
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sta rectParams
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lda projectileData+GO_POSY,y
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sta rectParams+2
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lda #GAMEOBJECTWIDTH
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sta rectParams+4
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lda #GAMEOBJECTHEIGHT
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sta rectParams+6
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ldx #0
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updateProjectileCollisionsPlayerLoop:
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cpx currentPlayer
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beq updateProjectileCollisionsPlayerNext
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jsr playerIntersectRect
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cmp #0
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bne updateProjectileCollisionsPlayerHit
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updateProjectileCollisionsPlayerNext:
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inx
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cpx #NUMPLAYERS
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bne updateProjectileCollisionsPlayerLoop
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; Check for terrain collisions
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lda projectileData+GO_POSX,y
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inc
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inc
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sta rectParams
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lda projectileData+GO_POSY,y
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clc
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inc
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inc
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sta rectParams+2
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lda #GAMEOBJECTWIDTH-4
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sta rectParams+4
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lda #GAMEOBJECTHEIGHT-4
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sta rectParams+6
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jsr intersectRectTerrain
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cmp #0
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bne updateProjectileCollisionsTerrainHit
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updateProjectileCollisionsDone:
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RESTORE_AXY
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rts
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updateProjectileCollisionsPlayerHit:
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jsr processPlayerImpact
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jsr endDeleteCurrProjectile
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bra updateProjectileCollisionsDone
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updateProjectileCollisionsTerrainHit:
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jsr processTerrainImpact
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jsr endDeleteCurrProjectile
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bra updateProjectileCollisionsDone
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; processTurnForProjectiles
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;
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;
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processTurnForProjectiles:
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SAVE_AXY
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ldx #0
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processTurnForProjectilesLoop:
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txy
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PROJECTILEPTR_Y
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lda projectileData+JD_AGE,y
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inc
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sta projectileData+JD_AGE,y
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processTurnForProjectilesSkip:
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inx
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cpx #MAXPROJECTILES
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bne processTurnForProjectilesLoop
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RESTORE_AXY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; endDeleteCurrProjectile
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;
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; Trashes A and Y
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;
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endDeleteCurrProjectile:
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lda #projectileData
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clc
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adc projectileActive
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sta PARAML0
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jsr unrenderGameObject
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ldy projectileActive
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jsr deleteProjectile
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bra endProjectile
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; deleteVisibleProjectile
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|
;
|
|
; Y = Projectile offset
|
|
; Trashes A
|
|
;
|
|
deleteVisibleProjectile:
|
|
lda #projectileData
|
|
sta PARAML0
|
|
tya
|
|
clc
|
|
adc PARAML0
|
|
sta PARAML0
|
|
jsr unrenderGameObject
|
|
bra deleteProjectile
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; endProjectile
|
|
;
|
|
; Trashes A
|
|
;
|
|
endProjectile:
|
|
lda #1
|
|
sta turnRequested
|
|
lda #-1
|
|
sta projectileActive
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; deleteProjectile
|
|
;
|
|
; Y = Projectile offset
|
|
; Trashes A
|
|
;
|
|
deleteProjectile:
|
|
lda #-1
|
|
sta projectileData+GO_POSX,y
|
|
|
|
; Check for special cleanup code
|
|
lda projectileData+JD_TYPE,y
|
|
tax ; Find projectile type data
|
|
PROJECTILETYPEPTR_X
|
|
|
|
lda projectileTypes+PT_CLEANUP,x
|
|
beq deleteProjectileDone
|
|
JSRA
|
|
|
|
deleteProjectileDone:
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; protectProjectiles
|
|
;
|
|
;
|
|
protectProjectiles:
|
|
SAVE_AXY
|
|
|
|
ldx #0
|
|
|
|
protectProjectilesLoop:
|
|
txy
|
|
PROJECTILEPTR_Y
|
|
lda projectileData+GO_POSX,y
|
|
bpl protectProjectilesGotOne
|
|
|
|
protectProjectilesContinue:
|
|
inx
|
|
cpx #MAXPROJECTILES
|
|
beq protectProjectilesDone
|
|
bra protectProjectilesLoop
|
|
|
|
protectProjectilesGotOne:
|
|
lda #projectileData+GO_POSX
|
|
sta PARAML0
|
|
clc
|
|
tya
|
|
adc PARAML0
|
|
sta PARAML0
|
|
phx
|
|
jsr vramPtr
|
|
cpx #$ffff
|
|
beq protectProjectilesOffscreen
|
|
|
|
lda #projectileData+GO_BACKGROUND
|
|
sta PARAML0
|
|
clc
|
|
tya
|
|
adc PARAML0
|
|
sta PARAML0
|
|
jsr protectGameObject
|
|
plx
|
|
bra protectProjectilesContinue
|
|
|
|
protectProjectilesDone:
|
|
RESTORE_AXY
|
|
rts
|
|
|
|
protectProjectilesOffscreen:
|
|
plx
|
|
bra protectProjectilesContinue
|
|
|
|
UPANGLE = $00af
|
|
DNANGLE = $ffaf
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; renderProjectiles
|
|
;
|
|
;
|
|
renderProjectiles:
|
|
SAVE_AXY
|
|
ldx #0
|
|
|
|
renderProjectilesLoop:
|
|
txy
|
|
PROJECTILEPTR_Y
|
|
jsr renderProjectile
|
|
|
|
renderProjectilesSkip:
|
|
inx
|
|
cpx #MAXPROJECTILES
|
|
bne renderProjectilesLoop
|
|
|
|
RESTORE_AXY
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; renderProjectile
|
|
;
|
|
; Y = Offset to projectile structure
|
|
; Trashes SCRATCHL
|
|
;
|
|
renderProjectile:
|
|
SAVE_AXY
|
|
|
|
lda projectileData+GO_POSX,y
|
|
bpl renderProjectileDoIt
|
|
jmp renderProjectileDone
|
|
|
|
renderProjectileDoIt:
|
|
lda projectileData+JD_TYPE,y
|
|
tax
|
|
PROJECTILETYPEPTR_X
|
|
|
|
lda #projectileData ; Calculate pointer for game object render
|
|
sta PARAML0
|
|
clc
|
|
tya
|
|
adc PARAML0
|
|
sta PARAML0
|
|
|
|
; Determine which sprite to use
|
|
lda projectileData+JD_VY,y
|
|
|
|
bmi renderProjectileNegYPosX
|
|
cmp #UPANGLE
|
|
bmi renderProjectileFlat
|
|
|
|
renderProjectileUpAngle:
|
|
lda projectileTypes+PT_FRAME0,x ; Up angle
|
|
bra renderProjectileGoSprite
|
|
|
|
renderProjectileNegYPosX:
|
|
cmp #DNANGLE
|
|
bpl renderProjectileFlat
|
|
|
|
renderProjectileDownAngle:
|
|
lda projectileTypes+PT_FRAME2,x ; Down angle
|
|
bra renderProjectileGoSprite
|
|
|
|
renderProjectileFlat:
|
|
lda projectileTypes+PT_FRAME1,x ; Flat
|
|
|
|
renderProjectileGoSprite:
|
|
sta SCRATCHL
|
|
lda projectileTypes+PT_DIRECTIONAL,x
|
|
beq renderProjectileGoSpriteNormal
|
|
lda projectileData+JD_FACING,y ; Projectile is directional, so flip sprite if needed
|
|
beq renderProjectileGoSpriteNormal
|
|
lda SCRATCHL
|
|
inc ; Flip it!
|
|
bra renderProjectileGoSpriteFlipped
|
|
|
|
renderProjectileGoSpriteNormal:
|
|
lda SCRATCHL
|
|
|
|
renderProjectileGoSpriteFlipped:
|
|
jsr renderGameObject
|
|
|
|
; Check for special deployment code
|
|
lda projectileTypes+PT_RENDER,x
|
|
beq renderProjectileDone
|
|
JSRA
|
|
|
|
renderProjectileDone:
|
|
RESTORE_AXY
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; unrenderProjectiles
|
|
;
|
|
;
|
|
unrenderProjectiles:
|
|
SAVE_AXY
|
|
ldx #0
|
|
|
|
unrenderProjectilesLoop:
|
|
txy
|
|
PROJECTILEPTR_Y
|
|
jsr unrenderProjectile
|
|
|
|
unrenderProjectilesSkip:
|
|
inx
|
|
cpx #MAXPROJECTILES
|
|
bne unrenderProjectilesLoop
|
|
|
|
RESTORE_AXY
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; unrenderProjectile
|
|
;
|
|
; Y = Offset to projectile structure
|
|
;
|
|
unrenderProjectile:
|
|
pha
|
|
lda projectileData+GO_POSX,y
|
|
bpl unrenderProjectileActive
|
|
jmp unrenderProjectileDone
|
|
|
|
unrenderProjectileActive:
|
|
lda projectileData+JD_NEW,y
|
|
beq unrenderProjectileDoIt
|
|
lda #0
|
|
sta projectileData+JD_NEW,y
|
|
jmp unrenderProjectileDone
|
|
|
|
unrenderProjectileDoIt:
|
|
lda #projectileData
|
|
sta PARAML0
|
|
clc
|
|
tya
|
|
adc PARAML0
|
|
sta PARAML0
|
|
jsr unrenderGameObject
|
|
|
|
unrenderProjectileDone:
|
|
pla
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; processPlayerImpact
|
|
;
|
|
; X = Index of player that was hit
|
|
; Y = Offset to projectile structure
|
|
;
|
|
processPlayerImpact:
|
|
phy
|
|
phx
|
|
PLAYERPTR_X
|
|
|
|
; Do hit animation
|
|
plx
|
|
txy
|
|
jsr renderHitAnimation
|
|
|
|
; Find projectile data structure
|
|
ply
|
|
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, SCRATCHL, PARAML0, PARAML1
|
|
;
|
|
processTerrainImpact:
|
|
ldy projectileActive
|
|
|
|
; Shift impact point to forward bottom corner according to V
|
|
lda projectileData+JD_VX,y
|
|
bmi processTerrainImpactNegative
|
|
|
|
lda projectileData+GO_POSX,y
|
|
clc
|
|
adc #GAMEOBJECTWIDTH/2+1 ; A fudge that makes crater location look better in this direction, and tunneling work better
|
|
bra processTerrainImpactStoreContinue
|
|
|
|
processTerrainImpactNegative:
|
|
lda projectileData+GO_POSX,y
|
|
clc
|
|
adc #GAMEOBJECTWIDTH/4-1 ; A fudge that makes crater location look better in this direction, and tunneling work better
|
|
|
|
processTerrainImpactStoreContinue:
|
|
sta PARAML0
|
|
pha ; Dirt explosion will need this
|
|
lda projectileData+GO_POSY,y
|
|
sec
|
|
sbc #GAMEOBJECTHEIGHT ; This fudge makes tunneling work better
|
|
sta PARAML1
|
|
pha ; Dirt explosion will need this
|
|
|
|
lda projectileData+JD_TYPE,y
|
|
tay
|
|
PROJECTILETYPEPTR_Y
|
|
|
|
lda projectileTypes+PT_RADIUS,y
|
|
tay
|
|
phy ; We'll need the radius in a moment
|
|
|
|
jsr craterTerrain
|
|
|
|
jsr unclipTerrain
|
|
|
|
; Recompile the rows affected by the crater
|
|
clc
|
|
lda PARAML1 ; Impact point is top row to recompile
|
|
adc #GAMEOBJECTHEIGHT ; Expand recompile area upwards because of tunneling fudge
|
|
tax
|
|
|
|
clc
|
|
pla
|
|
adc #GAMEOBJECTHEIGHT ; Expand "vertical" radius area because of tunneling fudge
|
|
sta SCRATCHL ; Need radius in a memory location for this math
|
|
txa
|
|
sec
|
|
sbc SCRATCHL
|
|
tay
|
|
lda SCRATCHL
|
|
jsr compileTerrainChunk
|
|
|
|
jsr clipTerrain
|
|
|
|
pla
|
|
sta PARAML1
|
|
pla
|
|
sta PARAML0
|
|
jsr createDirtExplosion
|
|
|
|
; Cash in the dirt if needed
|
|
ldy projectileActive
|
|
lda projectileData+JD_TYPE,y
|
|
tay
|
|
PROJECTILETYPEPTR_Y
|
|
|
|
lda projectileTypes+PT_MINING,y
|
|
beq processTerrainImpactDone
|
|
lda craterTerrainAccumulator
|
|
lsr ; Dirt to treats conversion rate
|
|
lsr
|
|
lsr
|
|
inc ; Ensure minimum one treat
|
|
sta PARAML0
|
|
jsr awardTreats
|
|
|
|
processTerrainImpactDone:
|
|
rts
|
|
|