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Add three-sprite rendering function

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This commit is contained in:
Lucas Scharenbroich 2022-06-07 10:05:40 -05:00
parent 2c409b02a7
commit 3591c494bf
1 changed files with 55 additions and 2 deletions
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57
src/tiles/FastRenderer.s
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@ -38,7 +38,7 @@ FastTileProcs dw _TBCopyDataFast,_TBCopyDataFast,_TBCopyDataFast,_TBCopyDataFa
SpriteDispatch
txy
SpriteBitsToVBuffAddrs OneSpriteFast;TwoSpritesFast;TwoSpritesFast;TwoSpritesFast
SpriteBitsToVBuffAddrs OneSpriteFast;TwoSpritesFast;ThreeSpritesFast;ThreeSpritesFast
; 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
@ -113,7 +113,6 @@ TwoSpritesFast
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}
@ -125,7 +124,61 @@ _TBApplySpriteData3
plb ; Reset to the bank in the top byte of CODE_ADDR_HIGH
rts
ThreeSpriteLine mac
; and [sprite_ptr2],y
db $37,sprite_ptr2
ora (sprite_ptr2),y
; and [sprite_ptr1],y
db $37,sprite_ptr1
ora (sprite_ptr1),y
; and [sprite_ptr0],y
db $37,sprite_ptr0
ora (sprite_ptr0),y
<<<
ThreeSpritesFast
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. 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....
sep #$20 ; set the sprite data bank
lda #^spritedata
pha
plb
rep #$20
]line equ 0
lup 8
ldy #{]line*SPRITE_PLANE_SPAN}
ldal tiledata+{]line*4},x
ThreeSpriteLine
sta tmp_tile_data+{]line*4}
ldy #{]line*SPRITE_PLANE_SPAN}+2
ldal tiledata+{]line*4}+2,x
ThreeSpriteLine
sta tmp_tile_data+{]line*4}+2
]line equ ]line+1
--^
ply ; Pop off CODE_ADDR_LOW
plb ; Set the CODE_ADDR_HIGH bank
]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
FourSpritesFast
; tyx
; lda TileStore+TS_TILE_ADDR,y