Debugger tile + OAM viewers: independent 2bpp pixel oracle (#53, fourth artifact — completes the chrome) - #61
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East tile canvas: VRAM 2bpp -> 128x192 indexed fb via gfx_fb, rebuilt on pause/step; harness reimplements 2bpp independently and compares all 24576 pixels vs gfx_fb's palette (DBG_TILEDATA seam reads the bus direct; --plant-tiles-fault caught at exactly tile 0's 64 px). South OAM text panel over mem_read with its decode leg + plant. Disasm window self-sizes to its halved east panel. All oracle legs green on real display + xvfb; equivalence gate, twins, lint, units green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Fourth and final artifact of #53: the tile and OAM viewers. With these, the issue's scope — dock chrome, registers + flags, pause / per-instruction / per-frame stepping, live disassembly with breakpoints, memory viewer, tile/VRAM/OAM views — is complete.
gfx_fb(raw color indices, not BGP-mapped — a VRAM view, not a screen view), rebuilt on pause/step.DBG_TILEDATAseam (bus bytes read directly) with its own Python 2bpp implementation and compares all 24,576 canvas pixels againstgfx_fb's exact palette.--plant-tiles-faultinverts tile 0 in the render fb only — caught at exactly 64 pixels.mem_read, decode leg vs theDBG_OAMseam,--plant-oam-faultcaught.Desktop acceptance note: the tile viewer shows Blargg's font glyphs sitting in VRAM — the charset is literally visible in the tile grid.
Closes #53.
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