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@ -18,7 +18,7 @@ Enjoy! I'll probably work on this off and on for the next few weeks until I've g
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## Current state
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Basic rendering is functional, with interactive zoom/pan (+/-/arrows) and 4 preset viewports via the number keys.
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Basic rendering is functional, with interactive zoom/pan (+/-/arrows) and 6 preset viewports via the number keys.
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The 16-bit signed integer multiplication takes two 16-bit inputs and emits one 32-bit output in the zero page, using the Atari OS ROM's floating point registers as workspaces. Inputs are clobbered.
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@ -27,7 +27,7 @@ The 16-bit signed integer multiplication takes two 16-bit inputs and emits one 3
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* when expanded RAM is available as on 130XE, a 64KB 8-bit multiplication table accelerates the remaining multiplications
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* without expanded RAM, a table of half-squares is used to implement the algorithm from https://everything2.com/title/Fast+6502+multiplication
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The mandelbrot calculations are done using 4.12-precision fixed point numbers. It may be possible to squish this down to 3.13.
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The mandelbrot calculations are done using 3.13-precision fixed point numbers with 6.26-precision intermediates.
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Iterations are capped at 255.
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12
todo.md
12
todo.md
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@ -1,15 +1,17 @@
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things to try:
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* fix status bar to show elapsed time, per-iter time, per-pixel iter count
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* 'turbo' mode disabling graphics in full or part
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* patch the entire expanded-ram imul8xe on top of imul8 to avoid the 3-cycle thunk penalty :D
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* try 3.13 fixed point instead of 4.12 for more precision
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* can we get away without the extra bit?
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* maybe clean up the load/layout of the big mul table
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* consider alternate lookup tables in the top 16KB under ROM
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* y-axis mirror optimization
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* 'wide pixels' 2x and 4x for a fuller initial image in the tiered rendering
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* maybe redo tiering to just 4x4, 2x2, 1x1?
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* extract viewport for display & re-input via keyboard
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* fujinet screenshot/viewport uploader
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