Reply To: scaling filters

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January 14, 2017 at 2:32 PM #10765
redguy_
Participant

    https://drive.google.com/file/d/0Bx9gzQZCkH8qVkszel9oblYtZ3M/view?usp=sharing

    FW 0.75-rg0
    – Added preliminary scaling filters for linex2 and linex3 M2/M3 optimized video modes.
    – Fixed (workaround) for sampling phase 180 degree shift in M2/M3 optimized video modes.

    * I normally flash with jtag, but I tested the SD card and it was able to correctly flash to an unmodified firmware from 0.75-aud-rg0 and also flash from an unmodified fw to 0.75-aud-rg0.
    * The scaling filters selection is available in the post-processing menu. It defaults to none. Eagle3x is an odd combination of eagle2x and lq3x which doesn’t always look very good. I usually use lq when I’m in the mood for filters.
    * Filter delta controls the difference allowed when comparing two pixels. It’s best to leave this at 32 right now.
    * Selecting a filter adds an additional 1 scanline of latency.
    * Selecting a filter results in the image shifting down a scanline due to delayed data read relative to sync/data_enable. That’s a bug I have yet to fix.
    * linex2 mode still has the flickering pixel problem when filters are enabled

    I tested all basic functionality that I could think of (only on snes and nes), but please understand that this is an alpha, custom firmware and you should only try it if you understand the implications.