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space_bars: working on splitting screen
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7862e051a1
commit
7740856c39
@ -211,17 +211,36 @@ sbloopD:dex ; 2
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sb_mixed:
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nop ;kill 6 cycles (room for rts) ; 2
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nop ; 2
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ldy #144 ; 2
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sb_mixed_loop:
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nop
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nop
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nop
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nop
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jsr split_4 ; 6+46
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dey ; 2
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bne sb_mixed_loop ; 3
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; -1
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; so need delay 5
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; in vblank
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; delay 144*65 = 9360
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; Try X=37 Y=49 cycles=9360
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ldy #49 ; 2
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sbloopE:ldx #37 ; 2
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sbloopF:dex ; 2
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bne sbloopF ; 2nt/3
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dey ; 2
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bne sbloopE ; 2nt/3
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; ldy #49 ; 2
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;sbloopE:ldx #37 ; 2
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;sbloopF:dex ; 2
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; bne sbloopF ; 2nt/3
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; dey ; 2
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; bne sbloopE ; 2nt/3
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@ -230,14 +249,17 @@ sbloopF:dex ; 2
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;======================================================
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; do_nothing should be 4550
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; - 5 from above
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; -10 keypress
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; ===========
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; 4540
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; 4535
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; Try X=9 Y=89 cycles=4540
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; Try X=40 Y=22 cycles=4533 R2
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ldy #89 ; 2
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sbloop1:ldx #9 ; 2
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nop
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ldy #22 ; 2
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sbloop1:ldx #40 ; 2
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sbloop2:dex ; 2
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bne sbloop2 ; 2nt/3
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dey ; 2
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@ -260,3 +282,4 @@ background_hgr:
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.incbin "SB_BACKGROUNDC.BIN.lz4",11
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background_hgr_end:
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.include "screen_split.s"
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80
space_bars/screen_split.s
Normal file
80
space_bars/screen_split.s
Normal file
@ -0,0 +1,80 @@
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; how quickly can we call this?
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; jump table, assuming size to split is in Y?
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; Autogenerate? As we want both HGR/TXT and HGR/GR versions?
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; 4 NnNnNnNnNnNnNnNnBBBBbbbbNnNnNnNnNnNnNnNnRrrrrr
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; 8 NnNnNnNnNnNnNnBBBBNnNnbbbbNnNnNnNnNnNnNnRrrrrr
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; 12 NnNnNnNnNnNnBBBBNnNnNnNnbbbbNnNnNnNnNnNnRrrrrr
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; 16 NnNnNnNnNnBBBBNnNnNnNnNnNnbbbbNnNnNnNnNnRrrrrr
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; 20 NnNnNnNnBBBBNnNnNnNnNnNnNnNnbbbbNnNnNnNnRrrrrr
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; 24 NnNnNnBBBBNnNnNnNnNnNnNnNnNnNnbbbbNnNnNnRrrrrr
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; 28 NnNnBBBBNnNnNnNnNnNnNnNnNnNnNnNnbbbbNnNnRrrrrr
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; 32 NnBBBBNnNnNnNnNnNnNnNnNnNnNnNnNnNnbbbbNnRrrrrr
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; 36 BBBBNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnbbbbRrrrrr
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split_4:
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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bit LORES
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bit HIRES
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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rts
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split_8:
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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bit LORES
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nop
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nop
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bit HIRES
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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rts
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; 6 4 25+16+8+16 NNNNNNNN
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; 7 6 25+15+10+15 LNNNNNN
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; 8 8 25+14+12+14 NNNNNNN
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; 9 10 25+13+14+13 LNNNNN
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; 10 12 25+12+16+12
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; 11 14 25+11+18+11
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; 12 16 25+10+20+10
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; 13 18 25+09+22+09
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; 14 20 25+08+24+08
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; 15 22 25+07+26+07
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; 16 24 25+06+28+06
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; 17 26 25+05+30+05
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; 18 28 25+04+32+04
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; 19 30 25+03+34+03
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; 20 32 25+02+36+02
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; 21 34 25+01+38+01
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