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display.sinc
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display.sinc
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.importzp _oam_off ;make this ZP variable accessible to assembly code
.segment "CODE"
;void __fastcall__ oam_clear_fast(void);
.export _oam_clear_fast ;make this function accessible to C code
_oam_clear_fast:
lda #240
.repeat 64,I
sta OAM_BUF+I*4
.endrepeat
rts
;void __fastcall__ oam_meta_spr_pal(unsigned char x,unsigned char y,unsigned char pal,const unsigned char *metasprite);
.export _oam_meta_spr_pal
_oam_meta_spr_pal:
sta <PTR
stx <PTR+1
ldy #2 ;three popa calls replacement, performed in reversed order
lda (sp),y
dey
sta <SCRX
lda (sp),y
dey
sta <SCRY
lda (sp),y
sta <DST ;this is palette, just repurposing RAM variable name
ldx _oam_off
@1:
lda (PTR),y ;x offset
cmp #$80
beq @2
iny
clc
adc <SCRX
sta OAM_BUF+3,x
lda (PTR),y ;y offset
iny
clc
adc <SCRY
sta OAM_BUF+0,x
lda (PTR),y ;tile
iny
sta OAM_BUF+1,x
lda (PTR),y ;attribute
iny
and #$fc ;remove palette bits
ora <DST ;add new palette bits
sta OAM_BUF+2,x
inx
inx
inx
inx
jmp @1
@2:
stx _oam_off
lda <sp
adc #2 ;carry is always set here, so it adds 3
sta <sp
bcc @3
inc <sp+1
@3:
rts
;void __fastcall__ oam_meta_spr_clip(signed int x,unsigned char y,const unsigned char *metasprite);
.segment "ZEROPAGE"
SPR_XOFF: .res 1
SPR_YOFF: .res 1
.segment "CODE"
.export _oam_meta_spr_clip
_oam_meta_spr_clip:
sta <PTR
stx <PTR+1
jsr popa ;y
sta <SCRY
jsr popax ;x
sta <SCRX
stx <DST ;this is X MSB, repurposing RAM variable name
ldx _oam_off
ldy #0
@1:
lda (PTR),y ;x offset
cmp #$80
beq @2
iny
sta <SPR_XOFF+0
clc
adc <SCRX
sta <SPR_XOFF+1
lda <SPR_XOFF+0
ora #$7f
bmi :+
lda #0
:
adc <DST
bne @skip
lda <SPR_XOFF+1
sta OAM_BUF+3,x
lda (PTR),y ;y offset
iny
clc
adc <SCRY
sta OAM_BUF+0,x
lda (PTR),y ;tile
iny
sta OAM_BUF+1,x
lda (PTR),y ;attribute
iny
sta OAM_BUF+2,x
inx
inx
inx
inx
jmp @1
@skip:
iny
iny
iny
jmp @1
@2:
stx _oam_off
rts
; static unsigned char sx,sy,tile,pal,off;
; static signed int sxx;
; off=0;
; while(1)
; {
; sx=metasprite[off++];
; if(sx==128) return;
; sxx =x+(signed char)sx;
; sy =metasprite[off++]+y;
; tile=metasprite[off++];
; pal =metasprite[off++];
; if(!(sxx&0xff00))
; {
; oam_spr(sxx,sy,tile,pal,oam_off);
; oam_off+=4;
; }
; }