Future/pokecrystal
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Start improving sprite movement engine (to do: identify bit flags)

Browse Source 
Introduce maskbits N[, S]: optionally shift the bitmask
This commit is contained in:
Rangi
2018-05-23 12:48:14 -04:00
parent 4e776d4fa6
commit 32b92ca51c
8 changed files with 150 additions and 135 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
home/map_objects.asm
View File

@@ -482,10 +482,10 @@ GetSpriteMovementFunction:: ; 1a2f
xor a
.ok
ld hl, SpriteMovementData
ld hl, SpriteMovementData + SPRITEMOVEATTR_MOVEMENT
ld e, a
ld d, 0
rept SPRITEMOVEDATA_FIELDS
rept NUM_SPRITEMOVEDATA_FIELDS
add hl, de
endr
ld a, [hl]
@@ -497,15 +497,15 @@ GetInitialFacing:: ; 1a47
push de
ld e, a
ld d, 0
ld hl, SpriteMovementData + 1 ; init facing
rept SPRITEMOVEDATA_FIELDS
ld hl, SpriteMovementData + SPRITEMOVEATTR_FACING
rept NUM_SPRITEMOVEDATA_FIELDS
add hl, de
endr
ld a, BANK(SpriteMovementData)
call GetFarByte
add a
add a
and $c
maskbits NUM_DIRECTIONS, 2
pop de
pop bc
ret
@@ -537,8 +537,8 @@ CopySpriteMovementData:: ; 1a61
push de
ld e, a
ld d, 0
ld hl, SpriteMovementData + 1 ; init facing
rept SPRITEMOVEDATA_FIELDS
ld hl, SpriteMovementData + SPRITEMOVEATTR_FACING
rept NUM_SPRITEMOVEDATA_FIELDS
add hl, de
endr
ld b, h
@@ -549,7 +549,7 @@ endr
inc bc
rlca
rlca
and %00001100
maskbits NUM_DIRECTIONS, 2
ld hl, OBJECT_FACING
add hl, de
ld [hl], a
@@ -654,7 +654,7 @@ SetSpriteDirection:: ; 1af8
and %11110011
ld e, a
pop af
and %00001100
maskbits NUM_DIRECTIONS, 2
or e
ld [hl], a
ret
@@ -664,6 +664,6 @@ GetSpriteDirection:: ; 1b07
ld hl, OBJECT_FACING
add hl, bc
ld a, [hl]
and %00001100
maskbits NUM_DIRECTIONS, 2
ret
; 1b0f