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Basic projectile updating

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This commit is contained in:
blondie7575 2017-08-22 20:33:07 -07:00
parent bfc3144c89
commit 7ecea5fa5c
4 changed files with 76 additions and 9 deletions
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5
gamemanager.s
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@ -60,9 +60,12 @@ gameplayLoopAngle:
gameplayLoopFire:
lda fireRequested
beq gameplayLoopEndFrame
beq gameplayLoopProjectiles
jsr fire
gameplayLoopProjectiles:
jsr updateProjectiles
gameplayLoopEndFrame:
lda quitRequested

BIN
gscats.2mg
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2
player.s
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@ -11,7 +11,7 @@ playerData:
.word 40 ; X pos in pixels (from left terrain edge)
.word 38 ; Y pos in pixels (from bottom terrain edge)
.word 90+45 ; Angle in degrees from +X
.word 45 ; Angle in degrees from +X
.word 50 ; Power
PD_POSX = 0 ; Byte offsets into player data structure

78
projectile.s
View File

@ -8,13 +8,20 @@
projectileData:
; gameobject data
.word 40 ; X pos in pixels (from left terrain edge)
.word 38 ; Y pos in pixels (from bottom terrain edge)
.word -1 ; Pos X in pixels (from left terrain edge)
.word 0 ; Pos Y in pixels (from bottom terrain edge)
.word 0 ; Pos X (8.8 fixed point)
.word 0 ; Pos Y (8.8 fixed point)
.word 0 ; Velocity X (8.8 fixed point)
.word 0 ; Velocity Y (8.8 fixed point)
JD_V = 4 ; Byte offsets into projectile data structure
JD_POSX = 0 ; Byte offsets into projectile data structure
JD_POSY = 2
JD_PRECISEX = 4
JD_PRECISEY = 6
JD_VX = 8
JD_VY = 10
projectileParams:
@ -46,6 +53,18 @@ fireProjectile:
iny
iny
lda projectileParams ; Fixed point version of X pos
xba
sta (SCRATCHL),y
iny
iny
lda projectileParams+2 ; Fixed point version of Y pos
xba
sta (SCRATCHL),y
iny
iny
lda projectileParams+4 ; Convert angle to vector
asl
tax
@ -61,9 +80,54 @@ fireProjectile:
lda angleToVectorY,x ; Velocity Y
sta (SCRATCHL),y
brk
fireProjectileLoop:
RESTORE_AXY
rts
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; updateProjectiles
;
; Trashes SCRATCHL
;
updateProjectiles:
SAVE_AXY
lda projectileData+JD_POSX
bmi updateProjectilesDone
; Integrate X velocity over position
lda projectileData+JD_PRECISEX
clc
adc projectileData+JD_VX
sta projectileData+JD_PRECISEX
; Convert to integral for rendering
lsr
lsr
lsr
lsr
lsr
lsr
lsr
lsr
sta projectileData+JD_POSX
; Integrate Y velocity over position
lda projectileData+JD_PRECISEY
clc
adc projectileData+JD_VY
sta projectileData+JD_PRECISEY
; Convert to integral for rendering
lsr
lsr
lsr
lsr
lsr
lsr
lsr
lsr
sta projectileData+JD_POSY
brk
updateProjectilesDone:
RESTORE_AXY
rts