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chiptune: update docs

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This commit is contained in:
Vince Weaver 2018-02-27 20:08:52 -05:00
parent d5da6c1407
commit 4efc30a019
2 changed files with 65 additions and 20 deletions
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71
chiptune_player/README.chiptune
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@ -299,12 +299,34 @@ VISUALIZATION
So now it takes $A0 (160) frames, or about 3 seconds. This seems to
be workable.
Interesting bugs that were hard to debug:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ Bug in qkumba's LZ4 decoder, only happened when a copy-block size was
exactly a multiple of 256, in which case it would copy
an extra time.
+ Bug where the box-drawing was starting at 0 rather than at Y.
Turns out I was padding the filename buffer with A0 but going
one too far and it was writing A0 to the first byte of the
hlin routine, and A0 is a LDY # instruction.
+ Our old friend: forgetting the '#' so we're comparing against some random
zero page value rather than a constant
+ Related, the accidentally put in a $ when I meant for it to be decimal.
I was copying to $14 pages instead of 14, overwriting the DOS buffers
which I didn't notice until I tried to load the next file.
FIGURES/TABLES
~~~~~~~~~~~~~~
Memory Map
==========
(not to scale)
------- $ffff
@ -331,7 +353,8 @@ Memory Map
Sizes
File Sizes
==========
Disk(3)
time ym5 KRW(3) KRW(2) Blocks On
~~~~ ~~~ ~~~~~~ ~~~~~~ ~~~~~~~~~~
@ -399,22 +422,40 @@ Key: $=DOS, @=catalog used, #=catalog reserved, .=free
f DEATH2.KRW l ROBOT.KRW
YM5 Compression Study
=====================
Interesting bugs that were hard to debug:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For example, intro2.ym5
+ Bug in qkumba's LZ4 decoder, only happened when a copy-block size was
exactly a multiple of 256, in which case it would copy
an extra time.
raw: 125440 bytes
+ Bug where the box-drawing was starting at 0 rather than at Y.
Turns out I was padding the filename buffer with A0 but going
one too far and it was writing A0 to the first byte of the
hlin routine, and A0 is a LDY # instruction.
Compressed, frame at a time (r0..r13, repeat)
+ Our old friend: forgetting the '#' so we're comparing against some random
zero page value rather than a constant
lzss: 44154 bytes
gzip: 17119 bytes
lz4: 14666 bytes (-16) (14685 -9, 21377 default)
bzip2: 12685 bytes
lzma (xz) 5312 bytes
+ Related, the accidentally put in a $ when I meant for it to be decimal.
I was copying to $14 pages instead of 14, overwriting the DOS buffers
which I didn't notice until I tried to load the next file.
Interleaved then Compressed (all of r0 in a row, then all of r1, etc).
lzss/interleaved: 7981 bytes
lha/interleaved: 3217 bytes <=== default used by ym5 format
lz4/interleaved: 3190 bytes (-16) (8914 default, 3209 -9)
bzip2/interleaved 3017 bytes
gzip/interleaved: 2759 bytes
lzma/interleaved: 2129 bytes
Split up, Interleaved, LZ4
lz4,1024*14 chunks 7971 bytes (-16) (14k output buffer)
lz4,768*14 chunks 9214 bytes (-16) (10.5k output buffer)
lz4,512*14 chunks 9294 bytes (-16) (7k output buffer)
Diff (each frame only update registers that change via bitmask)
This is method I used in the KSP demo
simple diff: 69224 bytes
lzss/diff: 31919 bytes
lz4/diff: 13669 bytes (11431 -9)
gzip/diff: 10821 bytes
bzip2/diff: 10477 bytes
lzma/diff: 7257 bytes

14
mockingboard/YM5_COMPRESSION
View File

@ -2,17 +2,15 @@ For example, intro2.ym5
raw: 125440 bytes
Compressed, frame at a time (r0..r13, repeat)
lzss: 44154 bytes
gzip: 17119 bytes
lz4: 14666 bytes (-16) (14685 -9, 21377 default)
bzip2: 12685 bytes
lzma (xz) 5312 bytes
Split up, Interleaved, LZ4
lz4,1024*14 chunks 7971 bytes (-16) (14k output buffer)
lz4,768*14 chunks 9474 bytes (-16) (10.5k output buffer)
Interleaved (all of r0 in a row, then all of r1, etc).
Interleaved then Compressed (all of r0 in a row, then all of r1, etc).
lzss/interleaved: 7981 bytes
lha/interleaved: 3217 bytes <=== default used by ym5 format
@ -21,6 +19,12 @@ bzip2/interleaved 3017 bytes
gzip/interleaved: 2759 bytes
lzma/interleaved: 2129 bytes
Split up, Interleaved, LZ4
lz4,1024*14 chunks 7971 bytes (-16) (14k output buffer)
lz4,768*14 chunks 9214 bytes (-16) (10.5k output buffer)
lz4,512*14 chunks 9294 bytes (-16) (7k output buffer)
Diff (each frame only update registers that change via bitmask)
simple diff: 69224 bytes
lzss/diff: 31919 bytes
lz4/diff: 13669 bytes (11431 -9)