Apple-2gs-SW/iigs-game-engine
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Implement overlapping rendering for two sprites

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This commit is contained in:
Lucas Scharenbroich 2022-06-02 13:59:15 -05:00
parent e6251f05a3
commit 783e813dc2
2 changed files with 54 additions and 51 deletions
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8
src/Sprite.s
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@ -41,6 +41,14 @@ InitSprites
cpx #16*2
bcc :loop4
; Initialize the Page 2 pointers
ldx #$100
lda #^spritemask
sta sprite_ptr0+2,x
sta sprite_ptr1+2,x
sta sprite_ptr2+2,x
sta sprite_ptr3+2,x
; Precalculate some bank values
jsr _CacheSpriteBanks
rts

97
src/tiles/FastRenderer.s
View File

@ -38,7 +38,7 @@ FastTileProcs dw _TBCopyDataFast,_TBCopyDataFast,_TBCopyDataFast,_TBCopyDataFa
SpriteDispatch
txy
SpriteBitsToVBuffAddrs OneSpriteFast;OneSpriteFast;OneSpriteFast;OneSpriteFast
SpriteBitsToVBuffAddrs OneSpriteFast;TwoSpritesFast;TwoSpritesFast;TwoSpritesFast
; Where there are sprites involved, the first step is to call a routine to copy the
; tile data into a temporary buffer. Then the sprite data is merged and placed into
@ -57,7 +57,6 @@ OneSpriteFast
tay
plb
; jmp _TBApplySpriteData2
_TBApplySpriteData2
]line equ 0
lup 8
@ -75,60 +74,56 @@ _TBApplySpriteData2
plb
rts
OneSpriteFastX
tax ; address of the sprite data
lda TileStore+TS_BASE_TILE_COPY,y ; copy routine (handles flips and other behaviors)
stal osf_copy+1
osf_copy jsr $0000
; ldx TileStore+TS_VBUFF_ADDR_0,y ; address of the sprite data
lda TileStore+TS_CODE_ADDR_HIGH,y ; load the bank of the target code field line
pha ; and put on the stack for later.
lda TileStore+TS_CODE_ADDR_LOW,y
tay
plb ; set the code field bank
OneSpriteToCodeField 0
OneSpriteToCodeField 1
OneSpriteToCodeField 2
OneSpriteToCodeField 3
OneSpriteToCodeField 4
OneSpriteToCodeField 5
OneSpriteToCodeField 6
OneSpriteToCodeField 7
rts
TwoSpriteLine mac
; and [sprite_ptr1],y
db $37,sprite_ptr1
ora (sprite_ptr1),y
; and [sprite_ptr0],y
db $37,sprite_ptr0
ora (sprite_ptr0),y
<<<
TwoSpritesFast
; tyx
; lda TileStore+TS_TILE_ADDR,y
; per :-1
; jmp (TileStore+TS_BASE_TILE_COPY,x) ; Copy the tile data to the temporary buffer
;:
; lda TileStore+TS_VBUFF_ADDR_0,y ; address of the sprite data
; sta spritedata_0
; sta spritemask_0
; lda TileStore+TS_VBUFF_ADDR_1,y ; address of the sprite data
; sta spritedata_1
; sta spritemask_1
ldx TileStore+TS_TILE_ADDR,y
lda TileStore+TS_CODE_ADDR_HIGH,y ; load the bank of the target code field line
pha ; and put on the stack for later.
lda TileStore+TS_CODE_ADDR_LOW,y
tay
plb ; set the code field bank
pha ; and put on the stack for later. Has TileStore bank in high byte.
lda TileStore+TS_CODE_ADDR_LOW,y ; load the address of the code field
pha ; Need to pop it later....
; TwoSpritesToCodeField 0
; TwoSpritesToCodeField 1
; TwoSpritesToCodeField 2
; TwoSpritesToCodeField 3
; TwoSpritesToCodeField 4
; TwoSpritesToCodeField 5
; TwoSpritesToCodeField 6
; TwoSpritesToCodeField 7
sep #$20 ; set the sprite data bank
lda #^spritedata
pha
plb
rep #$20
rts
]line equ 0
lup 8
ldy #{]line*SPRITE_PLANE_SPAN}
ldal tiledata+{]line*4},x
TwoSpriteLine
sta tmp_tile_data+{]line*4}
ldy #{]line*SPRITE_PLANE_SPAN}+2
ldal tiledata+{]line*4}+2,x
TwoSpriteLine
sta tmp_tile_data+{]line*4}+2
]line equ ]line+1
--^
ply ; Pop off CODE_ADDR_LOW
plb ; Set the CODE_ADDR_HIGH bank
_TBApplySpriteData3
]line equ 0
lup 8
lda tmp_tile_data+{]line*4}
sta: $0004+{]line*$1000},y
lda tmp_tile_data+{]line*4}+2
sta: $0001+{]line*$1000},y
]line equ ]line+1
--^
plb ; Reset to the bank in the top byte of CODE_ADDR_HIGH
rts
ThreeSpritesFast
FourSpritesFast