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Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Wed Feb 24, 2016 7:33 am
by Drew Sebastino
I'm
fairly certain this should work (if I actually build the jump table, of course.) I just got rid of the indexing on the "SplatRequestTable" because I'm only loading one splat right now, but I'll add it back latter. I'm just trying to take baby steps.
Code: Select all
start_draw_splat:
rep #$30 ;A=16, X/Y=16
lda SplatRequestTable+YPosition
and #$0000000000000111
asl
bne continue_calculating_vertical_offset
sta SplatSubTileYPosition
continue_calculating_vertical_offset:
lda SplatRequestTable+YPosition
ror
ror
ror
sep #$20 ;A=8
sta $4202
lda DataPerRowInBuffer
sta $4203 ;Apparently, there's some sort of waiting time for this?
lda SplatRequestTable+Height
sta FullTileSplatHeight
asl
asl
asl
asl
asl
sta DataSplatHeight
lda SplatRequestTable+Width
sta TileSplatWidth
rep #$30 ;A=16, X/Y=16
lda $4216
sta SplatBufferPosition
;======================================================================
lda SplatRequestTable+XPosition
ror
ror
and #%0011111111111111
clc
adc SplatBufferPosition
sta SplatBufferPosition
lda SplatRequestTable+XPosition
and #%0000000000000111
bne continue_calculating_x_offset
inc TileSplatWidth
lda SplatRequestTable+XPosition
and #%0000000000000111
continue_calculating_x_offset:
clc
adc SplatRequestTable+GraphicOffset
sta SplatGraphicOffset
lda SplatSubTileYPosition
asl
tax
jsr (VariableYOffsetCodeJumpTable,x)
;======================================================================
VariableYOffsetCodeJumpTable: (I don't remember the structure for
tables... I'm using the school's computer)
;======================================================================
start_draw_offset_3_splat:
ldx SplatBufferPosition
cpx EndOfBuffer
bcs draw_offset_3_splat_done
ldy SplatGraphicOffset
lda SplatGraphicOffset
clc
adc #$0014
sta SplatGraphicOffset
draw_offset_3_splat_first_rows:
lda Buffer+6,x
and #$0000,y
ora #$0002,y
sta Buffer+6,x
lda Buffer+8,x
and #$0004,y
ora #$0006,y
sta Buffer+8,x
lda Buffer+10,x
and #$0008,y
ora #$000A,y
sta Buffer+10,x
lda Buffer+12,x
and #$000C,y
ora #$000E,y
sta Buffer+12,x
lda Buffer+14,x
and #$0010,y
ora #$0012,y
sta Buffer+14,x
inc TilesDrawnHorizontally
cmp SplatTileWidth
bcs start_offset_3_splat_middle_rows
txa
clc
adc #$0010
tax
tya
clc
adc SplatDataHeight
tay
bra draw_offset_3_splat_first_rows
;======================================================================
start_draw_offset_3_splat_middle_rows:
ldx SplatBufferPosition
stz TilesDrawnHorizontally
txa
clc
adc DataPerRowInBuffer
tax
ldy SplatGraphicOffset
draw_offset_3_splat_middle_rows:
lda Buffer,x
and #$0000,y
ora #$0002,y
sta Buffer,x
lda Buffer+2,x
and #$0004,y
ora #$0006,y
sta Buffer+2,x
lda Buffer+4,x
and #$0008,y
ora #$000A,y
sta Buffer+4,x
lda Buffer+6,x
and #$000C,y
ora #$000E,y
sta Buffer+6,x
lda Buffer+8,x
and #$0010,y
ora #$0012,y
sta Buffer+8,x
lda Buffer+10,x
and #$0014,y
ora #$0016,y
sta Buffer+10,x
lda Buffer+12,x
and #$0018,y
ora #$001A,y
sta Buffer+12,x
lda Buffer+14,x
and #$001C,y
ora #$001E,y
sta Buffer+14,x
lda FullTilesDrawnVertically
cmp FullTileSplatHeight
bcs start_draw_offset_3_splat_last_rows
inc TilesDrawnHorizontally
cmp SplatTileWidth
bcs offset_3_splat_next_row
txa
clc
adc #$0010
tax
tya
clc
adc SplatDataHeight
tay
bra draw_offset_3_splat_middle_rows
offset_3_splat_next_row:
cpx EndOfBuffer
bcs draw_offset_3_splat_done
inc FullTilesDrawnVertically
inc TilesDrawnHorizontally
txa
clc
adc DataPerRowInBuffer
tax
lda SplatGraphicOffset
clc
adc #$0020
sta SplatGraphicOffset
tay
bra draw_offset_3_splat_middle_rows
;======================================================================
start_draw_offset_3_splat_last_rows:
ldx SplatBufferPosition
cpx EndOfBuffer
bcs draw_offset_3_splat_done
stz TilesDrawnHorizontally
txa
clc
adc DataPerRowInBuffer
tax
ldy SplatGraphicOffset
draw_offset_3_splat_last_rows:
lda Buffer,x
and #$0000,y
ora #$0002,y
sta Buffer,x
lda Buffer+2,x
and #$0004,y
ora #$0006,y
sta Buffer+2,x
lda Buffer+4,x
and #$0008,y
ora #$000A,y
sta Buffer+4,x
inc TilesDrawnHorizontally
cmp SplatTileWidth
bcs draw_offset_3_splat_done
txa
clc
adc #$0010
tax
tya
clc
adc SplatDataHeight
tay
bra draw_offset_3_splat_last_rows
;======================================================================
draw_offset_3_splat_done:
stz FullTilesDrawnVertically
rts
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Wed Feb 24, 2016 1:08 pm
by psycopathicteen
Espozo wrote:I know. Where did I get that wrong?
Also, you actually read it?
You indexed Y by an immediate. I didn't read the whole thing, I just noticed the repetitive part.
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Wed Feb 24, 2016 1:19 pm
by tokumaru
psycopathicteen wrote:You indexed Y by an immediate.
Several times. I was wondering if this wasn't a 65816 thing...
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Wed Feb 24, 2016 4:24 pm
by Drew Sebastino
Oh, I see now, when I was loading from $0000 which was indexed to get me the address of where the splat graphic is for drawing it... Yeah, I wasn't thinking.
It's an easy fix though.
I'll correct it, and then I'll make the jump table and then I'll make a 16x16 block graphic. I'll upload the tiles manually at first, and if it works, I'll go from there. I wonder how slow this will be... At least although there will be plenty of splats, there shouldn't be way too many appearing on the same frame. It's not like the guns shoot every frame. (The charger is a wide line of splats though.) I just thought about something, and it's that the roller is really going to suck trying to make.
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Wed Feb 24, 2016 9:41 pm
by Drew Sebastino
Yeah, I fixed it now, and I actually noticed that I left part of my code unfinished, (the part where it decides on what graphics to choose based on the sub tile x position) so I fixed that along with some other mess ups. I finished the graphics for 8 copies of a 16x16 block, but it's so large and you already know how it's going to look so I won't bother showing it here. (I'm really going to need a tool for it if I ever get anywhere...) Hopefully, I'll have something show up onscreen soon.
Code: Select all
start_draw_splat:
rep #$30 ;A=16, X/Y=16
lda SplatRequestTable+YPosition
and #$0000000000000111
asl
bne continue_calculating_vertical_offset
sta SplatSubTileYPosition
continue_calculating_vertical_offset:
lda SplatRequestTable+YPosition
ror
ror
ror
sep #$20 ;A=8
sta $4202
lda DataPerRowInBuffer
sta $4203 ;Apparently, there's some sort of waiting time for this?
rep #$30 ;A=16, X/Y=16
lda SplatRequestTable+Height
sta FullTileSplatHeight
asl
asl
asl
asl
asl
sta SplatDataHeight
lda SplatRequestTable+Width
sta TileSplatWidth
lda $4216
sta SplatBufferPosition
;======================================================================
lda SplatRequestTable+XPosition
and #%0000000000000111
bne continue_calculating_x_offset
inc TileSplatWidth
lda SplatRequestTable+XPosition
and #%0000000000000111
sep #$20 ;A=8
sta $4202
lda SplatRequestTable+DataSize
sta $4203 ;Apparently, there's some sort of waiting time for this?
rep #$30 ;A=16, X/Y=16
lda SplatRequestTable+XPosition
ror
ror
and #%0011111111111111
clc
adc SplatBufferPosition
sta SplatBufferPosition
lda $4216
sec
sbc SplatDataHeight
continue_calculating_x_offset:
clc
adc SplatRequestTable+GraphicOffset
sta SplatGraphicOffset
lda SplatSubTileYPosition
asl
tax
jsr (VariableYOffsetCodeJumpTable,x)
;======================================================================
VariableYOffsetCodeJumpTable:
.word start_draw_offset_3_splat,start_draw_offset_3_splat
.word start_draw_offset_3_splat,start_draw_offset_3_splat
.word start_draw_offset_3_splat,start_draw_offset_3_splat
.word start_draw_offset_3_splat,start_draw_offset_3_splat
;======================================================================
start_draw_offset_3_splat:
ldx SplatBufferPosition
cpx EndOfBuffer
bcs draw_offset_3_splat_done
ldy SplatGraphicOffset
lda SplatGraphicOffset
clc
adc #$0014
sta SplatGraphicOffset
draw_offset_3_splat_first_rows:
lda Buffer+6,x
and $0000,y
ora $0002,y
sta Buffer+6,x
lda Buffer+8,x
and $0004,y
ora $0006,y
sta Buffer+8,x
lda Buffer+10,x
and $0008,y
ora $000A,y
sta Buffer+10,x
lda Buffer+12,x
and $000C,y
ora $000E,y
sta Buffer+12,x
lda Buffer+14,x
and $0010,y
ora $0012,y
sta Buffer+14,x
inc TilesDrawnHorizontally
cmp SplatTileWidth
bcs start_offset_3_splat_middle_rows
txa
clc
adc #$0010
tax
tya
clc
adc SplatDataHeight
tay
bra draw_offset_3_splat_first_rows
;======================================================================
start_draw_offset_3_splat_middle_rows:
ldx SplatBufferPosition
stz TilesDrawnHorizontally
txa
clc
adc DataPerRowInBuffer
tax
ldy SplatGraphicOffset
draw_offset_3_splat_middle_rows:
lda Buffer,x
and $0000,y
ora $0002,y
sta Buffer,x
lda Buffer+2,x
and $0004,y
ora $0006,y
sta Buffer+2,x
lda Buffer+4,x
and $0008,y
ora $000A,y
sta Buffer+4,x
lda Buffer+6,x
and $000C,y
ora $000E,y
sta Buffer+6,x
lda Buffer+8,x
and $0010,y
ora $0012,y
sta Buffer+8,x
lda Buffer+10,x
and $0014,y
ora $0016,y
sta Buffer+10,x
lda Buffer+12,x
and $0018,y
ora $001A,y
sta Buffer+12,x
lda Buffer+14,x
and $001C,y
ora $001E,y
sta Buffer+14,x
lda FullTilesDrawnVertically
cmp FullTileSplatHeight
bcs start_draw_offset_3_splat_last_rows
inc TilesDrawnHorizontally
cmp SplatTileWidth
bcs offset_3_splat_next_row
txa
clc
adc #$0010
tax
tya
clc
adc SplatDataHeight
tay
bra draw_offset_3_splat_middle_rows
offset_3_splat_next_row:
cpx EndOfBuffer
bcs draw_offset_3_splat_done
inc FullTilesDrawnVertically
inc TilesDrawnHorizontally
txa
clc
adc DataPerRowInBuffer
tax
lda SplatGraphicOffset
clc
adc #$0020
sta SplatGraphicOffset
tay
bra draw_offset_3_splat_middle_rows
;======================================================================
start_draw_offset_3_splat_last_rows:
ldx SplatBufferPosition
cpx EndOfBuffer
bcs draw_offset_3_splat_done
stz TilesDrawnHorizontally
txa
clc
adc DataPerRowInBuffer
tax
ldy SplatGraphicOffset
draw_offset_3_splat_last_rows:
lda Buffer,x
and $0000,y
ora $0002,y
sta Buffer,x
lda Buffer+2,x
and $0004,y
ora $0006,y
sta Buffer+2,x
lda Buffer+4,x
and $0008,y
ora $000A,y
sta Buffer+4,x
inc TilesDrawnHorizontally
cmp SplatTileWidth
bcs draw_offset_3_splat_done
txa
clc
adc #$0010
tax
tya
clc
adc SplatDataHeight
tay
bra draw_offset_3_splat_last_rows
;======================================================================
draw_offset_3_splat_done:
stz FullTilesDrawnVertically
rts
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Thu Feb 25, 2016 10:27 pm
by Drew Sebastino
Wait, I forgot, what's the difference between "BSS" and "BSS7E"? I wanted to make a screen sized, 2bpp buffer, but it said there was a memory overflow so I moved it and it hasn't said anything else.
I was beginning to think about actual graphics, and there's no way to have individual clothes and stuff that aren't one color without overlaying 4 sprites over each other for one character, and even then, I'm not sure. I'd have all the clothes be the same for each character, but I'd have different weapons that would be separate sprites. I'll figure it all out when if I get there.
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Thu Feb 25, 2016 10:35 pm
by tepples
My linker script has three BSS segments.
- BSS: $000000-$001FFF
- BSS7E: $7E2000-$7EFFFF
- BSS7F: $7F0000-$7FFFFF
I split out BSS from BSS7E because only the first 8K of RAM is mirrored into LoROM banks ($00-$3F and $80-$BF).
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Thu Feb 25, 2016 10:46 pm
by Drew Sebastino
Ah, so it's fine. Thanks.
tepples wrote:the first 8K of RAM is mirrored into LoROM banks ($00-$3F and $80-$BF).
What's the point of that?
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Thu Feb 25, 2016 11:00 pm
by tepples
It's mirrored into $00 to allow the direct page and stack to work, as the 65816 requires them to be in bank $00.
It's mirrored into $00-$3F and $80-$BF so that LoROM programs have some RAM to use no matter what the data bank register is set to.
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Sun Feb 28, 2016 5:10 pm
by Drew Sebastino
Something that I'm trying to do that's making no sense to me is I'm trying to load the buffer position in ram (the begining of BSS7E) + the size of the buffer (the screen, so 256x224/4=14336) and it's saying that there's a range error, but I'm pretty sure they don't add up to 65536...
The first line is what's (somehow) problematic:
Code: Select all
lda #InkBuffer+InkBufferSize
sta EndOfBuffer
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Sun Feb 28, 2016 5:15 pm
by tepples
$7E2000 is already greater than $00FFFF. Try using only the low 16 bits if necessary.
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Sun Feb 28, 2016 5:26 pm
by Drew Sebastino
Oh, I was thinking about the whole first 8KB thing...
I never really thought about it though, and that's how do you do 24 bit addressing? I mean, I remember on the Irem M92, you had the different registers for it. I think it was ds? Anyway, yeah.
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Sun Feb 28, 2016 5:30 pm
by lidnariq
Much as the M92's V33 (8086) has CS, DS, and SS segment registers, the SNES's 65816 has K, B, and 0 bank registers.
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Sun Feb 28, 2016 5:31 pm
by Drew Sebastino
Could I have a rundown of what each does?
Re: SNES Splatoon (Not Even A Demo Yet Though...)
Posted: Mon Feb 29, 2016 11:11 am
by adam_smasher
Before you get knee-deep in 65816 coding, I'd highly recommend you at least take a gander at the classic
Programming The 65816, available for free download on our very own Wiki.
AFAICT, lidnariq's nomenclature is non-standard. I'm also, TBH, not exactly sure which
three registers they're talking about - there's only two bank registers on the 65816, the data bank register and the program bank register. At risk of stating the obvious, the data bank is used for data accesses and the program bank can be thought of as the most significant byte of the 24-bit PC.
On the 65816, many (most?) instructions have long addressing modes that let you use a full 24-bit address. But this is slower and less space-efficient than taking advantage of the bank registers - if you use a 16-bit address, the 65816 will generate the full address by automatically tacking the relevant 8-bit bank register onto the front. This will save a byte in the instruction stream and execute in fewer cycles. Moreover, not every addressing mode for every instruction can be made long, so if you really want to take advantage of everything the chip can do you need to be bank-aware.
I think I recall reading a post here from someone who disassembled some early SNES games and found that one of the reasons for all of their slowdown was that they basically used 24-bit addresses for everything, since their programmers hadn't quite grasped how to effectively use the banks or something.