ScumSoft
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Posts posted by ScumSoft
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Not really, those extra cycles don't matter as that is all the drawing that needs done. Unless there is a way to cram more P0 and P1's into the scanline
that would expand the drawing field.I do appreciate the assistance once again.
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OH! Yes, I know exactly why it's doing this now. My original kernal I wrote used a 6-byte ram buffer and I called them back in the correct order, when it is done linearly it's causing this jumble.
Thanks for the help, I can modify the parsing routine to adjust the bytes appropriately.
Ok time to get some sleep, been up all night pondering over this
[edit]The original code looked like this:
;Preload P0(0) and P1(0) lda GFXbuffer+0 ;[23]+3 Load P0(0) sta GRP0 ;[26]+3 Store P0(0) lda GFXbuffer+3 ;[29]+3 Load P1(0) sta GRP1 ;[32]+3 Store P1(0) ;***2 Cyc.left of HB, TIME TO DRAW!*** ;***Wait for P0(0) to draw*** ;Update P0 2 More times lda GFXbuffer+1 ;[35]+3 Load P0(1) sta GRP0 ;[38]+3 Draw P0(1) lda GFXbuffer+2 ;[41]+3 Load P0(2) sta GRP0 ;[44]+3 DRAW P0(2) stx.w GRP0 ;[47]+4 Clear GRP0 ;***Wait for P1(0) to draw*** ;Update P1 2 More times lda GFXbuffer+4 ;[51]+3 Load P1(1) sta GRP1 ;[54]+3 Draw P1(1) lda GFXbuffer+5 ;[57]+3 Load P1(2) sta GRP1 ;[60]+3 Draw P1(2) ;***FINISHED DRAWING*** stx.w GRP1 ;[63]+4 ;Clear GRP1 -
I'll post a compiled binary for ease of reference. I've written a 96x192 pixel controlled playfield. The players are aligned 8 pixels apart and set to 3 copies.
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Yeah look at the code and you'll see I manage this completely different than how everyone is used to
It's not a timing issue in the draw kernal, it's a parsing error in either byte storage or byte retrieval I think.
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Correction to the cycle times on Frame2, they were off 2 cycles and causing the video to skew a bit.
;************* ;* [FRAME 2/4] ;************* FRAME2: sta WSYNC ;[]+3 ;-PixelPos [-68], Color clock [0] dey ;[0]+2 ;Decrement scanline and compare to #0 bne .doDraw2 ;[2]+2/3 ;If more scanlines left, branch jmp OVERSCAN ;[]+3 ;EXIT PLAYFIELD KERNAL ;***CYCLE EXACT DRAW KERNAL*** .doDraw2 sleep 17 ;[5]+17 ;Cycle padding ;***Preload P0(0) and P1(0) lda #<DF2DATA ;[22]+2 Load P0(0) sta.w GRP0 ;[24]+4 Store P0(0) lda #<DF2DATA ;[28]+2 Load P1(0) sta.w GRP1 ;[30]+4 Store P1(0) ;***TIME TO DRAW! ;***Waiting for P0(0) to draw ;***Update P0 2 More times lda #<DF2DATA ;[34]+2 Load P0(1) sta.w GRP0 ;[36]+4 Draw P0(1) lda #<DF2DATA ;[40]+2 Load P0(2) sta.w GRP0 ;[42]+4 Draw P0(2) sleep 4 ;[46]+4 Padding ;***Waiting for P1(0) to draw ;***Update P1 2 More times lda #<DF2DATA ;[50]+2 Load P1(1) sta.w GRP1 ;[52]+4 Draw P1(1) lda #<DF2DATA ;[56]+2 Load P1(2) sta.w GRP1 ;[58]+4 Draw P1(2) ;***END DRAW*** jmp FRAME2 ;[62]+3 ;Will WSYNC after jumpNotice how "TESTING12345" is "TEING1ST2345"
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Indeed I will, once I get it working
I'm completely stumped, it's not fetching the data correctly after all
I'm not sure why so I'll post it here for you all to look at.It should display "TESTING12345" on the screen, but it fetches the data in the wrong order.
I stripped it down to bare bones for less confusion.
It should split the test pattern into 2 ScreenRAM banks for drawing between 2 frames. I'm trying to take advantage of the Data Fetchers self advancing pointer to parse the entire set of data.
If you have any questions about what it going on let me know, and I'll do my best to explain it.
Also don't go stealing my kernal implementation because it's just so amazing okay
But if you want to help me make it better, then by all means let me know how I can improve it!
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I see, works fine now. Thank you again.
[edit] Also forgot the #< for DF0DATA as well
the code I post is used for example and not what I am actually using right now. It's always changing so don't bother posting improvements to it. Just in case some of you wanted to. -
New problem, most likely an oversight as I've been coding all day.
FillScreenRAM: ;***Set Data Fetcher 0 to TitleScreen*** lda #<TitleScreen ;Bank5 sta DF0LOW lda #>TitleScreen sta DF0HI ;***Set Data Fetchers 1,2 to ScreenRAM*** lda #<ScreenRAM1 ;Bank6 sta DF1LOW lda #>ScreenRAM1 sta DF1HI lda #<ScreenRAM2 ;Bank6 sta DF2LOW lda #>ScreenRAM2 sta DF2HI lda #$0 ;Enable FastFetch sta FASTFETCH ;- ;***Start ScreenRAM fill*** ldx #11 ;Load 2304 bytes total .fillRAM ldy #$E8 ;-230 bytes * 10 blocks of data .fillRAMa lda DF0DATA ;Load byte from DF0 sta DF2WRITE ;Store in DF2 dey ;Next byte counter lda DF0DATA ;Load next byte from DF0 sta DF1WRITE ;Store in DF1 dey ;Next byte counter bne .fillRAMa ;repeat dex ;Next data block bne .fillRAM ;repeat ;***Done*** lda #$FF ;Disable FastFetch mode sta FASTFETCH ;- rts ;ReturnI am tying to transfer in a 2304-byte block of data from bank 5 into the ScreenRAM buffers:
;-------------------------------------------------------------------------------------------------- ;********************* ; [sTART OF BANK 5] ;********************* ORG $5000 ;Relocatable ORG address RORG $1000 ;- JUMP_TABLE ;Required Jump table for bank switching ;******************** Bank5Code: TitleScreen: ;Placeholder for code testing right now ;***[2304 bytes]*** REPEAT 2304 .byte #$FF REPEND ;******************** ORG $5FF6 ;Relocatable ORG address RORG $1FF6 ;- BANKS_AND_VECTORS ;Required Jump table for bank switching ;///////////////////// ;---[END OF BANK 5]--- ;///////////////////// ;******************************** ; [*GRAPHICS ONLY* BANK 6] ;******************************** ORG $6000 RORG $0000 ScreenRAM1 ds 1152 ScreenRAM2 ds 1152 ds ($1400 - *)
Yet it never fetches the data and returns all #$00's instead of #$FF
What did I miss this time?
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Nevermind I fixed it, thank you.
;************* ;* [FRAME 1/2] ;************* FRAME1: sta WSYNC ;[]+3 ;-PixelPos [-68], Color clock [0] dey ;[0]+2 ;Decrement scanline and compare to #0 bne .doDraw1 ;[2]+2/3 ;If more scanlines left, branch lda #$FF ;[]+2 ;Disable FastFetch mode sta FASTFETCH ;[]+4 ;- jmp OVERSCAN ;[]+3 ;EXIT PLAYFIELD KERNAL ;***CYCLE EXACT DRAW KERNAL*** .doDraw1 sleep 14 ;[5]+14 ;Cycle padding ;***Preload P0(0) and P1(0) lda #<DF0DATA ;[19]+2 Load P0(0) ;[18] <-Cycles we need to be at sta.w GRP0 ;[21]+4 Store P0(0) ;[21] lda #<DF0DATA ;[25]+2 Load P1(0) ;[24] sta.w GRP1 ;[27]+4 Store P1(0) ;[27] ;***TIME TO DRAW! ;***Waiting for P0(0) to draw ;***Update P0 2 More times lda #<DF0DATA ;[31]+2 Load P0(1) ;[30] sta.w GRP0 ;[33]+4 Draw P0(1) ;[33] lda #<DF0DATA ;[37]+2 Load P0(2) ;[36] sta.w GRP0 ;[39]+4 Draw P0(2) ;[39] sleep 4 ;[43]+4 Padding ;[42] ;***Waiting for P1(0) to draw ;***Update P1 2 More times lda #<DF0DATA ;[47]+2 Load P1(1) ;[46] sta.w GRP1 ;[49]+4 Draw P1(1) ;[49] lda #<DF0DATA ;[53]+2 Load P1(2) ;[52] sta.w GRP1 ;[55]+4 Draw P1(2) ;[55] ;***END DRAW*** jmp FRAME1 ;[]+3 ;Will WSYNC after jump[edit] Corrected the timing. "Slaps forehead"
Why didnt I just adjust my initial sleep delay 1 cycle to begin with.
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Tried that, makes it take 4 cycles.
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Can I get "lDA #<DF0DATA" to take 3 cycles to execute instead of 2?
I've got some cycle exact display timing going on and being 1 cycle off makes things look messy. I don't have the luxury of adjusting the timing elsewhere. The loads have to be 3 cycles
and I really want to use the DPC+ as a display output buffer. It's so much nicer this way If not, then much sadness on my end.
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Most of my questions will be out of me learning this for the first time
Good to know, thank you.
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Always appreciate the info.
What is the proper method for padding out each bank?
I've tried doing a "ds ($1000 - *)" in each bank after the code segment before the vector table but dasm just sits there churning out a huge file.
I've looked at the example project and not sure why this wouldn't work the same. Might be incorrect addressing of *? each bank is RORG to $F000.
;********************************************************** ;-------------------- ;---[sTART BANK 5]--- ;-------------------- ORG $5000 RORG $F000 JUMP_TABLE Bank5Code: ;******************** BASIC_KERNAL ;MACRO ;Pad remaining bank space ds ($0FF6 - *) ;Refuses to work here... ;******************** ORG $5FF6 RORG $FFF6 BANKS_AND_VECTORS ;--------------------- ;---[END OF BANK 5]--- ;--------------------- ;******************************** ; [*GRAPHICS ONLY* BANK 6] ;******************************** ORG $6000 RORG $0000 ,[...] Graphic data ect ds ($1000 - *) ;Works fine here
I use INCBIN at the head of the file to attach the DPCplus.arm code stub, so the rest "should" pad to the correct 32k size.
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I enjoy the challenge it poses to programmers. The limitations of the console cause one to think outside the box in order to perform the simplest of things.
Because of this, the reward of creating a fully working title is something to be VERY proud of and says allot about the hardships the original developers faced.
I tip my hat to every person whose managed to created a published product.
batariBasic doesn't count, that's cheating
(Well...not really but it's far simpler to use than ASM)My appeal is academic. I have some nostalgia from having one when I was little, but I only enjoy a handful of games on it. Most Activision titles are amazing programming feats and really show what the console can do, back when Activision was a cool company. Most known programing tricks for this console were taken from Activision titles! so I second the recommendation to check them out.
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Does Stella correctly reflect the cycle times when FastFetch mode is enabled? It should read 2 cycles for any LDA instruction from DPC registers such as:
lda DF0DATA, however it still shows 4 cycles so I assume it was never updated to reflect this mode? I just want to be sure FastFetch is working properly before I go pushing my kernal to the cycle maximums.
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So each letter is 4 pixels wide leaving 1 pixel space between letters? Sounds a bit scrunched to me.
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Okay here is the Rotate byte routine:
;******************************** ; [ROTATE ROUTINES] ;******************************** RotateBytes: lda #>Ror1 ;[]+3 Save high byte sta GENpoint+1 ;[]+3 Store in general pointer ldy P0shift ;[]+3 Load amount to rotate lda ROtableJmp,Y ;[]+4 Use shift as index sta GENpoint ;[]+3 Ready for jmp ldx #15 ;[]+2 Use counter as byte index .RORa lda P0buffer,X ;[]+4 Load Sprite byte to be rotated jmp (GENpoint) ;[]+5 Engage! ;Will have always branched by now, no need for further checks Ror4: lsr ;[]+2 bcc *+4 ;[]+2/3 ora #$80 ;[]+2 Ror3: lsr ;[]+2 bcc *+4 ;[]+2/3 ora #$80 ;[]+2 Ror2: lsr ;[]+2 bcc *+4 ;[]+2/3 ora #$80 ;[]+2 Ror1: lsr ;[]+2 bcc *+4 ;[]+2/3 ora #$80 ;[]+2 jmp .RotCont ;[]+3 Rol5: asl ;[]+2 adc #0 ;[]+2 Rol6: asl ;[]+2 adc #0 ;[]+2 Rol7: asl ;[]+2 adc #0 ;[]+2 .RotCont sta P0buffer,X ;[]+4 Store Result into 16-byte SPRITE buffer dex ;[]+2 Decrement counter bpl .RORa ;[]+2/3 Branch if more bytes to rotate rts ROtableJmp: .byte <.RORa, <Ror1, <Ror2, <Ror3, <Ror4, <Rol5, <Rol6, <Rol7
I haven't traced out the best/worst case scenarios for this yet, so it may be slower/same/faster.
Just wanted to show that I am taking what was posted and learning from it.
Thanks again guys as always!
Here is a demo of it in action, nothing special just a 8x16 sprite you can move around of my guy with a sword.
White color is drawn on Frame1
Red is drawn on Frame2
96x96 software controlled pixel playfield.
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Thanks for the advice, I think I got it now thanks to your ideas:
P0slot = 0 through 11
FrameNum = 0 or 1 for Frame1 and Frame2
;******************************** ; [MASKING ROUTINE] ;******************************** MaskData: ldy P0shift ;[]+3 Load player shift amount ldx MaskTable,Y ;[]+4 Load mask into X ldy #15 ;[]+2 Y will be our counter for 16-bytes ;******************************** ;Choose from 4 scenarios ;Slot / Frame ;0/0 = 0 .F1SE ;0/1 = 1 .F1SO (no inc slot) ;1/0 = 1 .F1SO = Inc P0slot ;1/1 = 0 .F1SE ;******************************** lda P0slot ;[]+3 Load player GFXslot number and #1 ;[]+2 Clear all but bit 0 eor FrameNum ;[]+3 Will result in truth table above beq .doMask ;[]+2/3 Scenarios 1 and 4 ;In scenario 2 or 3 so invert mask txa ;[]+2 eor #$FF ;[]+2 tax ;[]+2 lda FrameNum ;[]+3 Test Scenario 2 or 3 bne .doMask ;[]+2/3 FrameNum = 1 = Scenario 2 inc P0slot ;[]+5 Scenario 3, INC P0slot ;[MASK BYTES] .doMask lda P0buffer,Y ;[]+4 sax P0buffer,Y ;[]+4 dey ;[]+2 bpl .doMask ;[]+2/3 rts ;[]+6 ;******************************** ; [TABLES] ;******************************** MaskTable: ;$00,$01,$02,$03,$04,$05,$06,$07 .byte $FF,$7F,$3F,$1F,$0F,$07,$03,$01What do you think? Greatly simplified from my initial posting Or did I miss something from your ideas?
I am still understanding the rotate method Thomas posted, I think I've come up with a faster way to do them, but I'll see once I complete it.
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Oh, that makes sense.
Thought it was referring to addressing modes for data. Learn something new every day
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Has no intersecting lines, nor right angles?
[edit] In that case then "Has both direct and indirect addressing modes"
But I can't think of an way to explain both this and what direct and indirect modes do at the same time.
Direct addressing grabs a value straight from the address.
Indirect grabs the address from the address...then the value
lda Number = Number is a memory address which holds (5) lda Number,Y = Address of Number+Y (Y = 0-255) and returns value stored at Number+Y lda (Number) = Number holds an address not a direct value, so it returns an address which points to the value. lda (Number),Y = Same as above but returns (Address) then Number+Y
Hmmm, going from memory here so I might have gotten this wrong
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Yeah FrameNums bit 0 is always 0. Just needed my shifts and bit masks optimized a bit. I am no longer over cycles in the overscan and have 152 cycles left, so I am good for now.
Thanks for the help!
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Actually do see what your talking about, I'm a little too tired to check it all right now, but I'll definitely check it out. Thanks for the continued assistance.
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That reply I made then quickly fixed would be the typo
I should proof before I hit reply. Sorry to confuse! It should be anded with decimal 10 or HEX (A).For the first 16 values of FrameNum ie 0-15,
if you and with decimal 10 you take the beq branch when
FrameNum 0,1,4,5 the rest fall thru and that repeats
for every subsequent 16 values. That doesn't look like
odd frames to me except for the first 8 ie 0-7
The odd frames fall thru.
FrameNum only counts 4 frames, 0,2,4,6 that was it then I reset it to 0.
So worry not anymore about my Frame counter, all it does is index a jump later to the correct frame kernal, which is aligned to the position offsets of P0 and P1 for drawing in the Pixel slots. You can safely disregard its use in the Masking routines.
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Harmony DPC+ programming
in Atari 2600 Programming
Posted
Okay, I rewrote the display kernal to update in a linear fashion (needed to start thinking DPC+ style) and it looks correct now. However I still have that display corruption issue past scanline 190(stella counts vsync+vblank), so it starts on Playfield Scanline 153 to 192.
This would place it at pointer offset #1836, so this is 468 bytes that aren't being parsed correctly.
00-DPCtest.zip