se.cherkasov
d9666c23b4
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#3 audio.rs: replace linear interpolation with Catmull-Rom Hermite cubic. Stores prev_sample as p0 control point; m1=(p2-p0)/2, m2=(p2-p1)/2 tangents give continuous first derivative across batch boundaries. #4 ppu: add per-slot sprite shift registers (spr_shift_lo/hi, spr_x_counter, spr_attr_latch). load_sprite_shifters fetches pattern bytes with h-flip at dot 1 of each visible scanline. sprite_pixel_from_shifters replaces the per-pixel OAM scan; sprite-0 hit detection integrated into the shifter path. #5 joypad.rs: format_controller_read now preserves bits 1-5,7 as open bus (!0x41 mask) instead of zeroing bits 1-4, matching NES hardware behaviour.