2017-09-03 03:52:19 +00:00
|
|
|
;
|
|
|
|
|
; collision
|
|
|
|
|
;
|
|
|
|
|
; Created by Quinn Dunki on 9/2/17
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
rectParams:
|
|
|
|
|
.word 0 ; x
|
|
|
|
|
.word 0 ; y 0=terrain bottom, +y=up
|
|
|
|
|
.word 0 ; w
|
|
|
|
|
.word 0 ; h
|
|
|
|
|
|
|
|
|
|
rectParams2:
|
|
|
|
|
.word 0 ; x
|
|
|
|
|
.word 0 ; y 0=terrain bottom, +y=up
|
|
|
|
|
.word 0 ; w
|
|
|
|
|
.word 0 ; h
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
|
; intersectRectTerrain
|
|
|
|
|
;
|
|
|
|
|
; A => non zero if rectangle is intersecting terrain
|
|
|
|
|
;
|
|
|
|
|
intersectRectTerrain:
|
|
|
|
|
phy
|
|
|
|
|
|
|
|
|
|
; Convert X to words and compute horizontal extent
|
|
|
|
|
; Note that X counts from right terrain edge
|
|
|
|
|
lda rectParams
|
|
|
|
|
and #$fffe ; Force even
|
|
|
|
|
sta rectParams
|
|
|
|
|
|
2017-09-13 16:56:34 +00:00
|
|
|
lda #TERRAINWIDTH ; Reverse X coordinate system
|
2017-09-03 03:52:19 +00:00
|
|
|
sec
|
|
|
|
|
sbc rectParams
|
|
|
|
|
sta rectParams
|
|
|
|
|
tay ; We'll need this later as an index into height data words
|
|
|
|
|
|
|
|
|
|
sec
|
|
|
|
|
sbc rectParams+4 ; Convert width to extent
|
|
|
|
|
sta rectParams+4
|
|
|
|
|
|
|
|
|
|
; Convert height to vertical extent
|
|
|
|
|
lda rectParams+2
|
|
|
|
|
sec
|
|
|
|
|
sbc rectParams+6
|
|
|
|
|
sta rectParams+6
|
|
|
|
|
|
|
|
|
|
; Check Y bottom
|
|
|
|
|
intersectRectTerrainBottomLoop:
|
2018-01-16 20:56:53 +00:00
|
|
|
lda terrainDataFar,y
|
2017-09-03 03:52:19 +00:00
|
|
|
cmp rectParams+6
|
|
|
|
|
bpl intersectRectTerrainYep
|
|
|
|
|
dey
|
|
|
|
|
dey
|
|
|
|
|
cpy rectParams+4
|
|
|
|
|
bpl intersectRectTerrainBottomLoop
|
|
|
|
|
|
|
|
|
|
lda #0
|
|
|
|
|
ply
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
intersectRectTerrainYep:
|
|
|
|
|
lda #1
|
|
|
|
|
ply
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
|
; intersectRectRect
|
|
|
|
|
;
|
|
|
|
|
; A => non zero if rectangle is intersecting rectangle2
|
|
|
|
|
;
|
|
|
|
|
intersectRectRect:
|
|
|
|
|
lda rectParams+0 ; Convert widths to extents
|
|
|
|
|
clc
|
|
|
|
|
adc rectParams+4
|
|
|
|
|
sta rectParams+4
|
|
|
|
|
|
|
|
|
|
lda rectParams2+0
|
|
|
|
|
clc
|
|
|
|
|
adc rectParams2+4
|
|
|
|
|
sta rectParams2+4
|
|
|
|
|
|
|
|
|
|
lda rectParams+2 ; Convert heights to extents
|
|
|
|
|
sec
|
|
|
|
|
sbc rectParams+6
|
|
|
|
|
sta rectParams+6
|
|
|
|
|
|
|
|
|
|
lda rectParams2+2
|
|
|
|
|
sec
|
|
|
|
|
sbc rectParams2+6
|
|
|
|
|
sta rectParams2+6
|
|
|
|
|
|
|
|
|
|
lda rectParams+0 ; Past their right edge?
|
|
|
|
|
cmp rectParams2+4
|
|
|
|
|
bpl intersectRectRectNope
|
|
|
|
|
|
|
|
|
|
lda rectParams+4 ; Before their left edge?
|
|
|
|
|
cmp rectParams2+0
|
|
|
|
|
bmi intersectRectRectNope
|
|
|
|
|
|
|
|
|
|
lda rectParams+2 ; Past their bottom edge?
|
|
|
|
|
cmp rectParams2+6
|
|
|
|
|
bmi intersectRectRectNope
|
|
|
|
|
|
|
|
|
|
lda rectParams+6 ; Before their top edge?
|
|
|
|
|
cmp rectParams2+2
|
|
|
|
|
bpl intersectRectRectNope
|
|
|
|
|
|
|
|
|
|
lda #1
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
intersectRectRectNope:
|
|
|
|
|
lda #0
|
|
|
|
|
rts
|
