Apple-2gs-SW/iigs-game-engine
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Fix single-step vertical displacement issue

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This commit is contained in:
Lucas Scharenbroich 2022-06-01 07:50:19 -05:00
parent dec50bc6fc
commit cde517bcc9
3 changed files with 49 additions and 24 deletions
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6
src/Defs.s
View File

@ -203,10 +203,10 @@ SPRITE_VFLIP equ $0400
SPRITE_HFLIP equ $0200
; Stamp storage parameters
VBUFF_STRIDE_BYTES equ 12*4 ; Each line has 4 slots of 16 pixels + 8 buffer pixels
VBUFF_TILE_ROW_BYTES equ 8*VBUFF_STRIDE_BYTES ; Each row is comprised of 8 lines
VBUFF_STRIDE_BYTES equ {12*4} ; Each line has 4 slots of 16 pixels + 8 buffer pixels
VBUFF_TILE_ROW_BYTES equ {8*VBUFF_STRIDE_BYTES} ; Each row is comprised of 8 lines
VBUFF_TILE_COL_BYTES equ 4
VBUFF_SPRITE_STEP equ VBUFF_TILE_ROW_BYTES*3 ; Allocate space fo 16 rows + 8 rows of buffer
VBUFF_SPRITE_STEP equ {VBUFF_TILE_ROW_BYTES*3} ; Allocate space fo 16 rows + 8 rows of buffer
VBUFF_SPRITE_START equ {8*VBUFF_TILE_ROW_BYTES}+4 ; Start at an offset so $0000 can be used as an empty value
VBUFF_SLOT_COUNT equ 48 ; Have space for this many stamps

56
src/Sprite.s
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@ -150,6 +150,11 @@ _DoPhase1
lda #SPRITE_STATUS_EMPTY ; Mark as empty so no error if we try to Add a sprite here again
sta _Sprites+SPRITE_STATUS,y
lda _Sprites+TS_COVERAGE_SIZE,y ; Manually copy current value to old
sta _Sprites+OLD_TS_COVERAGE_SIZE,y
lda _Sprites+TS_LOOKUP_INDEX,y
sta _Sprites+OLD_TS_LOOKUP_INDEX,y
jmp _ClearSpriteFromTileStore ; Clear the tile flags, add to the dirty tile list and done
; Need to calculate new VBUFF information. The could be required for UPDATED, ADDED or MOVED
@ -158,15 +163,26 @@ _DoPhase1
jsr _CalcDirtySprite
; If the sprite is marked as ADDED, then it does not need to have its old tile locations cleared
lda tmpA
bit #SPRITE_STATUS_ADDED
bne :no_move
jsr _ClearSpriteFromTileStore
; If the sprite was not ADDED and also not MOVED, then there is no reason to erase the old tiles
; because they will be overwritten anyway.
bit #SPRITE_STATUS_MOVED
beq :no_move
; jsr _ClearSpriteFromTileStore
ldy tmpY
; Anything else (MOVED, UPDATED, ADDED) will need to have the VBUFF information updated and the
; current tiles marked for update
:no_move
lda #SPRITE_STATUS_OCCUPIED ; Clear the dirty bits (ADDED, UPDATED, MOVED)
sta _Sprites+SPRITE_STATUS,y
jmp _MarkDirtySpriteTiles
; Dispatch table. It's unintersting, so it's tucked out of the way
@ -341,7 +357,7 @@ next
_ClearSpriteFromTileStore
lda _SpriteBitsNot,y ; Cache this value in a direct page location
sta tmp0
ldx _Sprites+TS_COVERAGE_SIZE,y
ldx _Sprites+OLD_TS_COVERAGE_SIZE,y
jmp (csfts_tbl,x)
csfts_tbl dw csfts_1x1,csfts_1x2,csfts_1x3,csfts_out
dw csfts_2x1,csfts_2x2,csfts_2x3,csfts_out
@ -350,66 +366,66 @@ csfts_tbl dw csfts_1x1,csfts_1x2,csfts_1x3,csfts_out
csfts_out rts
csfts_3x3 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_3x3 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
TSClearSprite 2
TSClearSprite 4
TSClearSprite 1*{TS_LOOKUP_SPAN*2}
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+2
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+4
TSClearSprite 2*{TS_LOOKUP_SPAN*2}
TSClearSprite 2*{TS_LOOKUP_SPAN*2}+0
TSClearSprite 2*{TS_LOOKUP_SPAN*2}+2
TSClearSprite 2*{TS_LOOKUP_SPAN*2}+4
rts
csfts_3x2 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_3x2 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
TSClearSprite 2
TSClearSprite 1*{TS_LOOKUP_SPAN*2}
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+2
TSClearSprite 2*{TS_LOOKUP_SPAN*2}
TSClearSprite 2*{TS_LOOKUP_SPAN*2}+0
TSClearSprite 2*{TS_LOOKUP_SPAN*2}+2
rts
csfts_3x1 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_3x1 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
TSClearSprite 1*{TS_LOOKUP_SPAN*2}
TSClearSprite 2*{TS_LOOKUP_SPAN*2}
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
TSClearSprite 2*{TS_LOOKUP_SPAN*2}+0
rts
csfts_2x3 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_2x3 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
TSClearSprite 2
TSClearSprite 4
TSClearSprite 1*{TS_LOOKUP_SPAN*2}
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+2
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+4
rts
csfts_2x2 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_2x2 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
TSClearSprite 2
TSClearSprite 1*{TS_LOOKUP_SPAN*2}
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+2
rts
csfts_2x1 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_2x1 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
TSClearSprite 1*{TS_LOOKUP_SPAN*2}
TSClearSprite 1*{TS_LOOKUP_SPAN*2}+0
rts
csfts_1x3 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_1x3 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
TSClearSprite 2
TSClearSprite 4
rts
csfts_1x2 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_1x2 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
TSClearSprite 2
rts
csfts_1x1 ldx _Sprites+TS_LOOKUP_INDEX,y
csfts_1x1 ldx _Sprites+OLD_TS_LOOKUP_INDEX,y
TSClearSprite 0
rts

11
src/Sprite2.s
View File

@ -55,6 +55,7 @@ _CalcDirtySprite
bne mdsOut2
; Copy the current values into the old value slots
lda _Sprites+TS_COVERAGE_SIZE,y
sta _Sprites+OLD_TS_COVERAGE_SIZE,y
lda _Sprites+TS_LOOKUP_INDEX,y
@ -173,7 +174,15 @@ _MarkDirtySpriteTiles
dw :mark3x1,:mark3x2,:mark3x3,mdsOut
dw mdsOut,mdsOut,mdsOut,mdsOut
:vbuff_mul dw 0,52,104,156,208,260,312,364
:vbuff_mul
dw 0*VBUFF_STRIDE_BYTES
dw 1*VBUFF_STRIDE_BYTES
dw 2*VBUFF_STRIDE_BYTES
dw 3*VBUFF_STRIDE_BYTES
dw 4*VBUFF_STRIDE_BYTES
dw 5*VBUFF_STRIDE_BYTES
dw 6*VBUFF_STRIDE_BYTES
dw 7*VBUFF_STRIDE_BYTES
; Pair of macros to make the unrolled loop more concise
;