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Add Shadow Field

This commit is contained in:
Randy Thiemann 2023-10-18 13:14:48 +02:00
parent 313a97265f
commit 51283ae200
1 changed files with 51 additions and 4 deletions
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55
src/field.asm
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@ -6,29 +6,76 @@ INCLUDE "globals.asm"
SECTION "Field Variables", WRAM0 SECTION "Field Variables", WRAM0
wField:: ds (10*21) wField:: ds (10*24)
wShadowField:: ds (14*26)
SECTION "Field Functions", ROM0 SECTION "Field Functions", ROM0
FieldInit:: FieldInit::
ld hl, wField ld hl, wField
ld bc, 10*21 ld bc, 10*24
ld d, 1 ld d, 1
call UnsafeMemSet call UnsafeMemSet
ld hl, wShadowField
ld bc, 14*26
ld d, $FF
call UnsafeMemSet
ret ret
FieldClear:: FieldClear::
ld hl, wField ld hl, wField
ld bc, 10*21 ld bc, 10*24
ld d, TILE_FIELD_EMPTY ld d, TILE_FIELD_EMPTY
call UnsafeMemSet call UnsafeMemSet
ret ret
ToShadowField::
ld hl, wField
ld de, wShadowField+2
ld c, 24
.outer
ld b, 10
.inner
ld a, [hl+]
ld [de], a
inc de
dec b
jr nz, .inner
inc de
inc de
inc de
inc de
dec c
jr nz, .outer
ret
FromShadowField::
ld hl, wField
ld de, wShadowField+2
ld c, 24
.outer
ld b, 10
.inner
ld a, [de]
ld [hl+], a
inc de
dec b
jr nz, .inner
inc de
inc de
inc de
inc de
dec c
jr nz, .outer
ret
; This routine will copy wField onto the screen. ; This routine will copy wField onto the screen.
BlitField:: BlitField::
; What to copy ; What to copy
ld de, wField + 10 ld de, wField + 40
; Where to put it ; Where to put it
ld hl, FIELD_TOP_LEFT ld hl, FIELD_TOP_LEFT
; How much to increment hl after each row ; How much to increment hl after each row