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4-post thread, 2 images, Aug 6 2023. Same day as the RDNA2 assembler design doc (1688286623375454208). SPC project: vintage 640x480 VGA style render + 640x240 fallback for 15 KHz arcade CRTs (PGM-esk) + CRT shader scaling on Deck + OLED/LCD. Mix of render pixel aspect changes, less than 480 lines, letter-box for integer Y scaling. 15 KHz output path docked: HD Fury Nano (no <480p) -> HDMI-to-VGA -> sync combiner (GBS-C bug workaround) -> GBS-C line-drops 480p60 to 240p60 component. Bitmap font uses right angles + 2x2 stroke in 8x16 (pow2) so 640x240p still gets readable 8x8. Overscan safety: Y axis easy - keep cursor pinned in 'safe' zone, still print lines in overscan area (visible on non-overscan CRTs).
74 lines
3.0 KiB
JSON
74 lines
3.0 KiB
JSON
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"post_id": "1688018382543597568",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "1st SPC project: to be based on vintage 640x480 render (VGA style), +fallback to 640x240 for 15 KHz arcade CRTs (PGM-esk), and CRT shader scaling on Deck and OLED/LCD. Use mix of render pixel aspect changes, running less than 480 lines, and letter-box to keep integer Y scaling.",
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"timestamp": "2023-08-06 02:45:18",
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"https://pbs.twimg.com/media/F20LgFtWQAAMtcv?format=png&name=orig"
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"post_id": "1688019698904969216",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "My 15 KHz CRT output path when docked is HD Fury Nano (won't do <480p) doing HDMI to VGA, with a sync combiner (to workaround GBS-C bug), into GBS-C which line drops 480p ~60Hz to 240p ~60Hz and outputs component. The 640 width gets maintained even if some CRTs cannot resolve it.",
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"timestamp": "2023-08-06 02:50:32",
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"post_id": "1688021533904510976",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "Presents issues for UI, namely that my bitmap fonts need to look good in both 480p and 240p modes, so for editor (assembler) I'm going with a font that uses right angles and designed around 2x2 stroke width, in a 8x16 (pow2) bitmap, so 640x240p still gets a readable 8x8 (below)",
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"timestamp": "2023-08-06 02:57:50",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "The next challenge is overscan safety, since real non-VGA CRTs will be used in development. The Y axis has an easy fix, simply keep cursor pinned in the 'safe' zone, but still print lines in the overscan area (so they can be seen when attached to non-overscan CRTs/etc too).",
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"timestamp": "2023-08-06 03:00:08",
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