thejayman77
ba74bbd5aa
Per-vertex GS fog end-to-end (gs_stub emit incl. persp_emit5, gs_prim_list_feeder XYZ2->XYZF2 on PRIM.FGE, gs_make_sh3_scheduler_fixture.py F/FGE packing), new fog TBs, fidelity attribution tooling. Functional baseline before removing the dead bilinear lerp8 clamps (Codex: 161-node comb loop -> -0.042ns setup fail). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
65 lines
1.7 KiB
Python
65 lines
1.7 KiB
Python
#!/usr/bin/env python3
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"""Preview the exact Ch437 separable-linear SH3 scanout map."""
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import math
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import sys
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from PIL import Image
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def blend(a, b, frac, denom):
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return tuple(((denom - frac) * x + frac * y + denom // 2) // denom
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for x, y in zip(a, b))
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def score(a, b):
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ae = 0
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se = 0
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n = a.width * a.height * 3
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for pa, pb in zip(a.getdata(), b.getdata()):
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for ca, cb in zip(pa, pb):
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d = int(ca) - int(cb)
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ae += abs(d)
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se += d * d
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return ae / n, math.sqrt(se / n)
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def main(argv):
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if len(argv) != 4:
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raise SystemExit(
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"usage: preview_scanout_ch437.py <fb.png> <reference.png> <out.png>"
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)
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src = Image.open(argv[1]).convert("RGB")
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if src.size != (640, 480):
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raise SystemExit(f"expected 640x480 framebuffer, got {src.size}")
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ref = Image.open(argv[2]).convert("RGB").resize(
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(640, 480), Image.Resampling.BILINEAR
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)
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out = Image.new("RGB", (640, 480))
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px = out.load()
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for y in range(480):
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yn = y * 14
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y0 = 32 + yn // 15
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yf = yn % 15
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y1 = min(y0 + 1, 479)
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for x in range(640):
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xn = x * 4
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x0 = xn // 5
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xf = xn % 5
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x1 = min(x0 + 1, 511)
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left = blend(src.getpixel((x0, y0)),
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src.getpixel((x0, y1)), yf, 15)
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right = blend(src.getpixel((x1, y0)),
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src.getpixel((x1, y1)), yf, 15)
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px[x, y] = blend(left, right, xf, 5)
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out.save(argv[3])
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mae, rmse = score(out, ref)
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print(f"bilinear MAE={mae:.4f} RMSE={rmse:.4f}")
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print(f"wrote {argv[3]}")
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if __name__ == "__main__":
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main(sys.argv)
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