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39 lines
1.5 KiB
Plaintext
39 lines
1.5 KiB
Plaintext
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1. Merge some of the common code in decode_note()
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2. Use a jump table for the two switch() statements in decode_note()
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3. Make the frequency and volume table lookups use self-modify code
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instead of checking which table to use at runtime
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4. The time-length calculation can be much faster, it only needs to find
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the length of one channel (not all three, right now re-using code)
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5. I also should run some more PT3 files through to verify correctness,
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I've only validated 3 so far.
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6. Merge mockingboard output to register calc, instead of setting
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all 13 registers then walking through and outputting them
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7. Clear out the channel data with a memset() instead of explicitly
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setting values?
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8. Self modify the 1MHz vs 1.7MHz change
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9. Align the volume/frequency tables. Save a few cycles on the reads?
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some further out things
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1. I think the z80 assembly version generates the lookup tables at startup,
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potentially saving a lot of space
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2. Each channel uses roughly 40 bytes of state, so 120 bytes total.
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Putting that in the zero page will save a lot of space in the executable
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(though wouldn't really help speed that much if I keep using index-X
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addressing mode). I don't think game/demo authors would be excited
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about giving up half the zero page though.
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Player:
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1. Loop support
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2. Keys to increase/decrease pattern
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3. Handle LZ4 compressed files?
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4. Have RTS code exit with error if file not found
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5. Center the title/author?
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Bugs:
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Sometimes when using arrows, the next song will have channels out
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of synch?
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