mirror of
https://github.com/KrisKennaway/ii-vision.git
synced 2025-01-18 01:29:47 +00:00
Initial working version of video player.
The basic strategy is that we remove as much conditional evaluation as possible from the inner decode loop. e.g. rather than doing opcode dispatch by some kind of table lookup (etc), this is precomputed on the server side. The next opcode in the stream is encoded as a branch offset to that opcode's first instruction, and we modify the BRA instruction in place to dispatch there. TCP buffer management is also offloaded to the server side; we rely on the server to explicitly schedule an ACK opcode every 2048 bytes to drop us into a slow path where we move the W5100 read pointer, send the TCP ACK, and block until the read socket has enough data to continue with. This outer loop is overly conservative (e.g. since we're performing exactly known read sizes we can omit a lot of duplicate bookkeeping), i.e. there is a lot of room for optimizing this. Experimental (i.e. not working yet) support for audio delay loop; we should be able to leverage the way we do offset-based dispatch to implement variable-delay loops with some level of cycle resolution.
This commit is contained in:
kris
parent
1b54c9c864
commit
9da18f0ecc
@ -1,6 +1,6 @@
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;
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; main.s
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; ethernet
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; ethernet video decoder
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;
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; Created by Kris Kennaway on 03/01/2019.
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; Copyright © 2019 Kris Kennaway. All rights reserved.
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@ -89,6 +89,12 @@ GETSIZE = $08 ; 2 BYTES FOR RX_RSR
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GETOFFSET = $0A ; 2 BYTES FOR OFFSET ADDR
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GETSTARTADR = $0C ; 2 BYTES FOR PHYSICAL ADDR
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hgr = $f3e2
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gr = $c050
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text = $c051
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fullscr = $c052
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tick = $c030
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; RESET AND CONFIGURE W5100
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LDA #6 ; 5 RETRIES TO GET CONNECTION
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STA PTR ; NUMBER OF RETRIES
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@ -143,7 +149,7 @@ RESET:
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STA WADRH
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LDA #<S0MR
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STA WADRL
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LDA #1 ; TCP MODE
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LDA #$21 ; TCP MODE | !DELAYED_ACK
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STA WDATA
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; SET LOCAL PORT NUMBER
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@ -237,28 +243,27 @@ ERRMSG: .byte $d3,$cf,$c3,$cb,$c5,$d4,$a0,$c3,$cf,$d5,$cc,$c4,$a0,$ce,$cf,$d4,$a
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SETUP:
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; CALCULATE OFFSET ADDRESS USING READ POINTER AND RX MASK
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LDA #<S0RXRD
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STA WADRL
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LDA WDATA ; HIGH BYTE
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AND #>RXMASK
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STA GETOFFSET+1
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LDA WDATA ; LOW BYTE
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AND #<RXMASK
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STA GETOFFSET
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; SET BUFFER ADDRESS ON APPLE
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; LDA #0 ; LOW BYTE OF BUFFER
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; STA PTR
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; LDA #$50 ; HIGH BYTE
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; STA PTR+1
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;JSR DEBUG
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;RTS
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; init graphics
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LDA #$7f
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JSR hgr
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STA fullscr
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; CHECK FOR ANY RECEIVED DATA
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CHECKRECV:
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BIT KBD ; KEYPRESS?
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BPL @NEXT
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LDA KBDSTRB
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JMP CLOSECONN ; CLOSE CONNECTION
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STA tick
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; BIT KBD ; KEYPRESS?
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; BPL @NEXT
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; LDA KBDSTRB
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; JMP CLOSECONN ; CLOSE CONNECTION
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@NEXT:
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;@NEXT:
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LDA #<S0RXRSR ; S0 RECEIVED SIZE REGISTER
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STA WADRL
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LDA WDATA ; HIGH BYTE OF RECEIVED SIZE
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@ -267,6 +272,7 @@ CHECKRECV:
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JMP RECV ; THERE IS DATA
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NORECV:
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; XXX needed?
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NOP ; LITTLE DELAY ...
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NOP
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JMP CHECKRECV ; CHECK AGAIN
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@ -277,12 +283,27 @@ RECV:
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LDA #<S0RXRSR ; GET RECEIVED SIZE AGAIN
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STA WADRL
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LDA WDATA
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;JSR $FDDA
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beq CHECKRECV ; expected >=1 page
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CMP #$10 ; expect at least 4k
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bcc CHECKRECV ; not yet
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STA GETSIZE+1
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LDA WDATA
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STA GETSIZE ; low byte XXX should be 0
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;jsr DEBUG
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LDA WDATA ; XXX: do I have to read it? DOn't think so
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; We know there is at least a page in the buffer, so read it
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; reset address pointer to socket buffer
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; CALCULATE OFFSET ADDRESS USING READ POINTER AND RX MASK
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LDA #<S0RXRD
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STA WADRL
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LDA WDATA ; HIGH BYTE
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AND #>RXMASK
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STA GETOFFSET+1
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LDA WDATA ; LOW BYTE
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; why is this not 0?
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;BEQ @L ; XXX assert 0
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;BRK
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@L:
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AND #<RXMASK
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STA GETOFFSET
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; CALCULATE PHYSICAL ADDRESS WITHIN W5100 RX BUFFER
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CLC
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@ -293,62 +314,132 @@ RECV:
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ADC #>RXBASE
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STA GETSTARTADR+1
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; SET BUFFER ADDRESS ON W5100
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JSR DEBUG ; UNCOMMENT FOR W5100 DEBUG INFO
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; SET BUFFER ADDRESS ON W5100
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;JSR DEBUG ; UNCOMMENT FOR W5100 DEBUG INFO
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LDA GETSTARTADR+1 ; HIGH BYTE FIRST
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STA WADRH
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LDA GETSTARTADR
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STA WADRL
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; SET BUFFER ADDRESS ON APPLE
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; XXX can hoist this out of the loop and let the low byte wrap
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LDA #0 ; LOW BYTE OF BUFFER
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STA PTR
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LDA #$50 ; HIGH BYTE
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STA PTR+1
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; restore content
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PLA
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; fall through
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; BEGIN COPY
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LDY #$00
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@L:
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LDA WDATA
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STA (PTR),Y
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JSR CLEANOUT ; DEBUG PRINT
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INY
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BNE @L
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; MAIN VIDEO LOOP
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op_nop: ; 11
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LDY WDATA ; 4
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STY @D+1 ; 4
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@D:
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BRA op_done ; 3
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LDA #$8D ; <CR>
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JSR COUT ; DEBUG PRINT
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op_store: ; 20
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LDY WDATA ; 4
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store1:
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STA $2000,y ; 5
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LDY WDATA ; 4
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STY @D+1 ; 4
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@D:
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BRA op_done ; 3
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op_set_content: ; 15
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LDA WDATA ; 4
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LDY WDATA ; 4
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STY @D+1 ; 4
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@D:
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BRA op_done ; 3
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op_set_page: ; 27
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LDY WDATA ; 4
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STY store1+2 ; 4
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STY rle2+2 ; 4
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;STY batch_store1+2 ; 4
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LDY WDATA ; 4
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STY @D+1 ; 4
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@D:
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BRA op_done ; 3
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op_rle: ; 12 + N (2 + 5 + 3) + (-1 + 4 + 4 + 3) = 22 + 10N
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LDY WDATA ; 4 start offset
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STY rle2+1 ; 4
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LDY WDATA ; 4 repeat count
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rle1:
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DEY ; 2
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rle2:
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STA $2000,y ; 5
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BNE rle1 ; 2/3
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LDY WDATA ; 4
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STY @D+1 ; 4
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@D:
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BRA op_done ; 3
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;op_batch_store: ; 4 + N(4 + 5 + 2 + 3) + -1 + 4 + 4 + 3 = 14 + 14 N
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; LDX WDATA ; 4 number of stores
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;@1:
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; LDY WDATA ; 4 offset
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;batch_store1:
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; STA $2000,y ; 5
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; DEY ; 2
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; BNE @1 ; 2/3
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; LDY WDATA ; 4
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; STY @D+1 ; 4
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;@D:
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; BRA op_done ; 3
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; tick with cycle padding, 15 .. 35 duty cycle in increments of 2 cycles
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; 20 cycles of NOP
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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op_tick:
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STY tick ; 4
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LDY WDATA ; 4
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STY @D+1 ; 4
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@D:
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BRA op_done ; 3
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op_done:
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RTS
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op_ack:
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; MOVE ADDRESS POINTER 1 page further in socket buffer
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; LDX WADRH ; socket pointer
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; INX
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; UPDATE REXRD TO REFLECT DATA WE JUST READ
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UPDATERXRD:
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; TODO: be careful about which registers we stomp here
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; UPDATERXRD:
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PHA ; XXX
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CLC
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LDA #>S0RXRD ; NEED HIGH BYTE HERE
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STA WADRH ; XXX needed? I think this is already set
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STA WADRH
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LDA #<S0RXRD
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STA WADRL
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LDA WDATA ; HIGH BYTE
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LDA WDATA
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TAY ; SAVE
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LDA WDATA ; LOW BYTE ; needed? I don't think so
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BEQ @1
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BRK
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@1:
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ADC #$00 ; GETSIZE ; ADD LOW BYTE OF RECEIVED SIZE
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TAX ; SAVE
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TYA ; GET HIGH BYTE BACK
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ADC #$08 ;GETSIZE+1 ; ADD HIGH BYTE OF RECEIVED SIZE
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TAY ; SAVE
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INY
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LDA #<S0RXRD
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STA WADRL ; XXX already there?
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; INC WDATA ; Does this work? If it accesses twice it will auto-inc
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STY WDATA ; SEND HIGH BYTE
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; ADC GETSIZE ; ADD LOW BYTE OF RECEIVED SIZE
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; TAX ; SAVE
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; TYA ; GET HIGH BYTE BACK
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; ADC GETSIZE+1 ; ADD HIGH BYTE OF RECEIVED SIE
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; TAY ; SAVE
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; LDA #<S0RXRD
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; STA WADRL
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; STY WDATA ; SEND HIGH BYTE
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; STX WDATA ; SEND LOW BYTE
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STX WDATA ; SEND LOW BYTE
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; SEND THE RECV COMMAND
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LDA #<S0CR
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@ -398,6 +489,14 @@ CLEANOUT:
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; DEBUG - PRINT W5100 STARTADR AND SIZE
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DEBUG:
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LDA #$A0 ; " "
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JSR COUT
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LDA #$A4 ; "$"
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JSR COUT
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LDA GETOFFSET+1
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LDX GETOFFSET
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JSR PRNTAX
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LDA #$A0 ; " "
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JSR COUT
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LDA #$A4 ; "$"
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@ -405,13 +504,14 @@ DEBUG:
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LDA GETSTARTADR+1
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LDX GETSTARTADR
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JSR PRNTAX
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; LDA #$A0 ; " "
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; JSR COUT
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; LDA #$A4 ; "$"
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; JSR COUT
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; LDA GETSIZE+1
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; LDX GETSIZE
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; JSR PRNTAX
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LDA #$A0 ; " "
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JSR COUT
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LDA #$A4 ; "$"
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JSR COUT
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LDA GETSIZE+1
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LDX GETSIZE
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JSR PRNTAX
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LDA #$8D
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JMP COUT ; THIS WILL DO THE RTS
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