Apple-2gs-SW/iigs-game-engine
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Filter out more sprites and PPU nametable changes

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This commit is contained in:
Lucas Scharenbroich 2023-05-22 11:15:45 -05:00
parent 166274c6c2
commit d402d60a4e
1 changed files with 48 additions and 0 deletions
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48
demos/smb/ppu.s
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@ -250,6 +250,9 @@ PPUDATA_WRITE ENT
rep #$10 rep #$10
ldx ppuaddr ldx ppuaddr
cmp PPU_MEM,x
beq :nochange
sta PPU_MEM,x sta PPU_MEM,x
rep #$30 rep #$30
@ -288,6 +291,14 @@ PPUDATA_WRITE ENT
:nocache :nocache
cpx #$3F00 cpx #$3F00
bcs :extra bcs :extra
bra :done
:nochange
rep #$30
txa
clc
adc ppuincr
sta ppuaddr
:done :done
sep #$30 sep #$30
@ -540,6 +551,8 @@ spriteCount ds 0
mx %00 mx %00
scanOAMSprites scanOAMSprites
stz Tmp5
sep #$30 sep #$30
ldx #4 ; Always skip sprite 0 ldx #4 ; Always skip sprite 0
@ -549,6 +562,8 @@ scanOAMSprites
lda PPU_OAM,x ; Y-coordinate lda PPU_OAM,x ; Y-coordinate
cmp #200+y_offset-9 cmp #200+y_offset-9
bcs :skip bcs :skip
cmp #16
bcc :skip
lda PPU_OAM+1,x ; $FC is an empty tile, don't draw it lda PPU_OAM+1,x ; $FC is an empty tile, don't draw it
cmp #$FC cmp #$FC
@ -565,6 +580,39 @@ scanOAMSprites
sta OAM_COPY+2,y sta OAM_COPY+2,y
sep #$20 sep #$20
* ; Debug OAM values
* phy
* phx
* rep #$30
* ldx Tmp5
* cpx #{160*190}
* bcs :nodraw
* lda OAM_COPY+2,y
* pha
* lda OAM_COPY,y
* ldy #$FFFF
* jsr DrawWord
* lda Tmp5
* clc
* adc #128+16
* tax
* ldy #$FFFF
* pla
* jsr DrawWord
* lda Tmp5
* clc
* adc #8*160
* sta Tmp5
* :nodraw
* sep #$30
* plx
* ply
iny iny
iny iny
iny iny