From 04afbe73d13a02dc2c4954d6d2c933c8090f6237 Mon Sep 17 00:00:00 2001 From: sylph-decoder Date: Mon, 31 Aug 2026 06:24:57 +0000 Subject: [PATCH] tools: separate 'submitted' from 'on screen' in a draw log The blend map reports a quad's SIZE, which identifies an element and says nothing about whether it is visible -- a parked quad is still a draw call. This prints the NDC x/y range and per-vertex colour of every additive draw, per frame, so movement between frames and overlap with the [-1,1] box are readable directly. Written because sylpheed-port flagged exactly that conflation in my blend page: the blend and the visibility arrived in the same artefact. Co-Authored-By: Claude Opus 5 (1M context) Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v --- tools/re-capture/sweep_positions.py | 52 +++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100755 tools/re-capture/sweep_positions.py diff --git a/tools/re-capture/sweep_positions.py b/tools/re-capture/sweep_positions.py new file mode 100755 index 00000000..6443fd76 --- /dev/null +++ b/tools/re-capture/sweep_positions.py @@ -0,0 +1,52 @@ +#!/usr/bin/env python3 +"""Where the two rotated sweep strips actually are, per frame, from a draw log. + + sweep_positions.py [...] + +The blend map reports a quad's SIZE. That identifies an element and says nothing +about whether it is on screen: a parked quad is still a draw call. This prints the +NDC x-range and the per-vertex colour of every 8-vertex ADDITIVE draw, per frame, +so "submitted" and "visible" stop being the same observation. + +NDC x is in [-1, +1] across the surface, so a strip overlaps the screen iff +x_min < 1 and x_max > -1. Movement between frames is the loop running. +""" +import re +import sys + +VIS_LO, VIS_HI = -1.0, 1.0 + + +def quads(line): + vs = [(float(a), float(b), c) for a, b, c in + re.findall(r"\[(-?\d+\.\d+),(-?\d+\.\d+),z=[-\d.]+,col=([0-9A-F]{8})\]", line)] + return [vs[i:i + 4] for i in range(0, len(vs) - 3, 4)] + + +def main(): + for path in sys.argv[1:]: + print("=== %s ===" % path) + lines = open(path).read().splitlines() + frame = 0 + print("%-6s %-5s %-6s %-18s %-18s %-8s %s" + % ("frame", "draw", "quad", "NDC x range", "NDC y range", "col", "on screen?")) + for i, line in enumerate(lines): + m = re.match(r"--- frame (\d+) ---", line) + if m: + frame = int(m.group(1)) + continue + m = re.search(r"^\s*(\d+) prim=\d+ indices=(\d+).* blend=0x01010101", line) + if not m or i + 1 >= len(lines): + continue + for k, q in enumerate(quads(lines[i + 1])): + xs = [p[0] for p in q] + ys = [p[1] for p in q] + on = min(xs) < VIS_HI and max(xs) > VIS_LO and min(ys) < VIS_HI and max(ys) > VIS_LO + print("%-6d %-5s %-6d %7.2f .. %7.2f %7.2f .. %7.2f %-8s %s" + % (frame, m.group(1), k, min(xs), max(xs), min(ys), max(ys), + q[0][2], "ON SCREEN" if on else "parked off screen")) + print() + + +if __name__ == "__main__": + main()