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re: the boot splash black gap is ~9 units, measured in draws not luminance

Browse Source 
The port found its boot had no black frame between the publisher and developer
splashes and authored 12 units by analogy with the menus' transition quad. On
the boot path that analogy has nothing behind it -- palogo_eff0.prm is a single
static keyframe, so the splash bundles declare no fade quad.

I had agreed with the dismissal that hid the defect: told the residual was
0.03 s against a bound built from two measured ranges plus jitter slack, I said
it said more about the bound than the game. The real gap was 0.2 s.

Measured in the draw stream, which separates true black from a fade tail where
luminance cannot: palogo_sqex is drawn to frame 125 at alpha 7, frames 126-129
submit NO sprite quad at all, and the developer fades in at frame 130 from
alpha 34. Four presented frames, the only such run in the sequence.

Converted with the disc as its own clock rather than a frame rate -- this run
presented at 13.1 fps against 28 elsewhere -- palogo_sqex declares alpha >= 1
for 239.8 units and is drawn in 105 frames, giving 2.284 units per presented
frame, which the title capture independently corroborates at 2.231. So the gap
is ~9.1 units (0.152 s), against the 12 authored; +-1 frame is 6.9-11.4. And
the true black is SHORTER, since both boundary frames still carry picture.

Second finding: the developer splash is ONE composited 525x259 quad at the
bounding box of its three declared logos, none of whose individual sizes is
ever submitted. That is why an earlier pass reported "developer splash: 0
frames".

Declaration sites ruled out: the splash bundles (no fade quad) and the
top-level +0x08 (a family constant, 300/60, slack 12-226 units). The
executable is NOT looked at and is named as the next place rather than
claimed.

Also answers the port's sweep question: +0x08 canNOT settle it, because
ptloop01/ptloop02 have zero slack and a zero-slack record cannot distinguish
"loops" from "runs once and stops". The oracle settles it for the TITLE -- the
sweep oscillates over its whole range and resets hard to the same start, once
in dwell 1 and twice in dwell 2, so it does not park. The MENU is unmeasured
and stays open.

Tooling: GRACE and NOTAP knobs for ui_draw_capture.sh. The script taps A on
"the screen changed a lot", which is also true of a fading splash -- a first
run tapped through the publisher and the developer never appeared. The
instrument was perturbing what it measured.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsEPXWVaEpyfudtR6re1Pd
This commit is contained in:
sylph-decoder
2026-08-29 20:36:15 +00:00
parent 69bc4cd1cd
commit 1a2f4fdc2d
6 changed files with 457 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

234
docs/re/data/boot-splash-gap-draws.csv Normal file
View File

@@ -0,0 +1,234 @@
# Every sprite quad submitted during the boot splashes, from the guest's
# own draw stream. Capture: ui_draw_capture.sh GRACE=1 NOTAP=1 ARM=early,
# 2026-08-29. Full-screen quads (w>=1250) are omitted.
# frames 126..129 carry NO sprite quad at all -- that is the black gap.
frame,x,y,w,h,vertex_alpha
2,301,317,685,90,119
3,301,317,685,90,153
4,301,317,685,90,187
6,301,317,685,90,246
7,301,317,685,90,240
9,301,317,685,90,229
10,301,317,685,90,223
11,301,317,685,90,220
12,301,317,685,90,214
13,301,317,685,90,211
14,301,317,685,90,183
15,301,317,685,90,155
16,301,317,685,90,127
17,301,317,685,90,98
18,301,317,685,90,70
19,301,317,685,90,56
20,301,317,685,90,28
21,307,331,666,65,255
22,307,331,666,65,255
23,307,331,666,65,255
24,307,331,666,65,255
25,307,331,666,65,255
26,307,331,666,65,255
27,307,331,666,65,255
28,307,331,666,65,255
29,307,331,666,65,255
30,307,331,666,65,255
31,307,331,666,65,255
32,307,331,666,65,255
34,307,331,666,65,255
35,307,331,666,65,255
37,307,331,666,65,255
38,307,331,666,65,255
39,307,331,666,65,255
40,307,331,666,65,255
41,307,331,666,65,255
42,307,331,666,65,255
43,307,331,666,65,255
44,307,331,666,65,255
45,307,331,666,65,255
46,307,331,666,65,255
47,307,331,666,65,255
48,307,331,666,65,255
49,307,331,666,65,255
50,307,331,666,65,255
51,307,331,666,65,255
52,307,331,666,65,255
53,307,331,666,65,255
54,307,331,666,65,255
55,307,331,666,65,255
56,307,331,666,65,255
57,307,331,666,65,255
58,307,331,666,65,255
59,307,331,666,65,255
60,307,331,666,65,255
61,307,331,666,65,255
62,307,331,666,65,255
63,307,331,666,65,255
64,307,331,666,65,255
65,307,331,666,65,255
66,307,331,666,65,255
67,307,331,666,65,255
68,307,331,666,65,255
69,307,331,666,65,255
70,307,331,666,65,255
71,307,331,666,65,255
72,307,331,666,65,255
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74,307,331,666,65,255
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78,307,331,666,65,255
79,307,331,666,65,255
80,307,331,666,65,255
81,307,331,666,65,255
82,307,331,666,65,255
83,307,331,666,65,255
84,307,331,666,65,255
85,307,331,666,65,255
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90,307,331,666,65,255
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93,307,331,666,65,255
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103,307,331,666,65,255
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107,307,331,666,65,255
108,307,331,666,65,255
109,307,331,666,65,255
110,307,331,666,65,255
111,307,331,666,65,255
112,307,331,666,65,255
113,307,331,666,65,249
114,307,331,666,65,243
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125,307,331,666,65,7
130,378,155,525,259,34
131,378,155,525,259,51
132,378,155,525,259,85
133,378,155,525,259,119
134,378,155,525,259,136
135,378,155,525,259,153
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145,378,155,525,259,255
146,378,155,525,259,254
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149,378,155,525,259,152
151,378,155,525,259,84
152,378,155,525,259,50
153,378,155,525,259,33
154,390,162,499,241,255
155,390,162,499,241,255
156,390,162,499,241,255
157,390,162,499,241,255
158,390,162,499,241,255
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160,390,162,499,241,255
161,390,162,499,241,255
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164,390,162,499,241,255
165,390,162,499,241,255
166,390,162,499,241,255
167,390,162,499,241,255
168,390,162,499,241,255
169,390,162,499,241,255
170,390,162,499,241,255
171,390,162,499,241,255
172,390,162,499,241,255
173,390,162,499,241,255
174,390,162,499,241,255
176,390,162,499,241,255
177,390,162,499,241,255
179,390,162,499,241,255
180,390,162,499,241,255
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184,390,162,499,241,255
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186,390,162,499,241,255
187,390,162,499,241,255
188,390,162,499,241,255
189,390,162,499,241,255
190,390,162,499,241,255
191,390,162,499,241,255
192,390,162,499,241,255
193,390,162,499,241,255
194,390,162,499,241,255
195,390,162,499,241,255
196,390,162,499,241,255
197,390,162,499,241,255
198,390,162,499,241,255
199,390,162,499,241,255
200,390,162,499,241,255
201,390,162,499,241,255
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203,390,162,499,241,255
204,390,162,499,241,255
205,390,162,499,241,255
206,390,162,499,241,255
207,390,162,499,241,255
208,390,162,499,241,255
209,390,162,499,241,255
210,390,162,499,241,255
211,390,162,499,241,255
212,390,162,499,241,255
213,390,162,499,241,255
214,390,162,499,241,255
215,390,162,499,241,255
216,390,162,499,241,255
217,390,162,499,241,255
218,390,162,499,241,255
219,390,162,499,241,255
221,390,162,499,241,255
223,390,162,499,241,255
224,390,162,499,241,255
225,390,162,499,241,255
226,390,162,499,241,255
227,390,162,499,241,255
228,390,162,499,241,255
229,390,162,499,241,255
230,390,162,499,241,255
231,390,162,499,241,255
232,390,162,499,241,255
233,390,162,499,241,255
234,390,162,499,241,255
235,390,162,499,241,255
236,390,162,499,241,254
237,390,162,499,241,243
238,390,162,499,241,231
239,390,162,499,241,198
240,390,162,499,241,165
241,390,162,499,241,131
242,390,162,499,241,115
243,390,162,499,241,81
244,390,162,499,241,48
245,390,162,499,241,23
246,390,162,499,241,7
1 # Every sprite quad submitted during the boot splashes, from the guest's
2 # own draw stream. Capture: ui_draw_capture.sh GRACE=1 NOTAP=1 ARM=early,
3 # 2026-08-29. Full-screen quads (w>=1250) are omitted.
4 # frames 126..129 carry NO sprite quad at all -- that is the black gap.
5 frame,x,y,w,h,vertex_alpha
6 2,301,317,685,90,119
7 3,301,317,685,90,153
8 4,301,317,685,90,187
9 6,301,317,685,90,246
10 7,301,317,685,90,240
11 9,301,317,685,90,229
12 10,301,317,685,90,223
13 11,301,317,685,90,220
14 12,301,317,685,90,214
15 13,301,317,685,90,211
16 14,301,317,685,90,183
17 15,301,317,685,90,155
18 16,301,317,685,90,127
19 17,301,317,685,90,98
20 18,301,317,685,90,70
21 19,301,317,685,90,56
22 20,301,317,685,90,28
23 21,307,331,666,65,255
24 22,307,331,666,65,255
25 23,307,331,666,65,255
26 24,307,331,666,65,255
27 25,307,331,666,65,255
28 26,307,331,666,65,255
29 27,307,331,666,65,255
30 28,307,331,666,65,255
31 29,307,331,666,65,255
32 30,307,331,666,65,255
33 31,307,331,666,65,255
34 32,307,331,666,65,255
35 34,307,331,666,65,255
36 35,307,331,666,65,255
37 37,307,331,666,65,255
38 38,307,331,666,65,255
39 39,307,331,666,65,255
40 40,307,331,666,65,255
41 41,307,331,666,65,255
42 42,307,331,666,65,255
43 43,307,331,666,65,255
44 44,307,331,666,65,255
45 45,307,331,666,65,255
46 46,307,331,666,65,255
47 47,307,331,666,65,255
48 48,307,331,666,65,255
49 49,307,331,666,65,255
50 50,307,331,666,65,255
51 51,307,331,666,65,255
52 52,307,331,666,65,255
53 53,307,331,666,65,255
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63 63,307,331,666,65,255
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66 66,307,331,666,65,255
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84 84,307,331,666,65,255
85 85,307,331,666,65,255
86 86,307,331,666,65,255
87 87,307,331,666,65,255
88 88,307,331,666,65,255
89 89,307,331,666,65,255
90 90,307,331,666,65,255
91 91,307,331,666,65,255
92 92,307,331,666,65,255
93 93,307,331,666,65,255
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95 95,307,331,666,65,255
96 96,307,331,666,65,255
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101 102,307,331,666,65,255
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103 105,307,331,666,65,255
104 106,307,331,666,65,255
105 107,307,331,666,65,255
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142 148,378,155,525,259,186
143 149,378,155,525,259,152
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145 152,378,155,525,259,50
146 153,378,155,525,259,33
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148 155,390,162,499,241,255
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175 185,390,162,499,241,255
176 186,390,162,499,241,255
177 187,390,162,499,241,255
178 188,390,162,499,241,255
179 189,390,162,499,241,255
180 190,390,162,499,241,255
181 191,390,162,499,241,255
182 192,390,162,499,241,255
183 193,390,162,499,241,255
184 194,390,162,499,241,255
185 195,390,162,499,241,255
186 196,390,162,499,241,255
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192 202,390,162,499,241,255
193 203,390,162,499,241,255
194 204,390,162,499,241,255
195 205,390,162,499,241,255
196 206,390,162,499,241,255
197 207,390,162,499,241,255
198 208,390,162,499,241,255
199 209,390,162,499,241,255
200 210,390,162,499,241,255
201 211,390,162,499,241,255
202 212,390,162,499,241,255
203 213,390,162,499,241,255
204 214,390,162,499,241,255
205 215,390,162,499,241,255
206 216,390,162,499,241,255
207 217,390,162,499,241,255
208 218,390,162,499,241,255
209 219,390,162,499,241,255
210 221,390,162,499,241,255
211 223,390,162,499,241,255
212 224,390,162,499,241,255
213 225,390,162,499,241,255
214 226,390,162,499,241,255
215 227,390,162,499,241,255
216 228,390,162,499,241,255
217 229,390,162,499,241,255
218 230,390,162,499,241,255
219 231,390,162,499,241,255
220 232,390,162,499,241,255
221 233,390,162,499,241,255
222 234,390,162,499,241,255
223 235,390,162,499,241,255
224 236,390,162,499,241,254
225 237,390,162,499,241,243
226 238,390,162,499,241,231
227 239,390,162,499,241,198
228 240,390,162,499,241,165
229 241,390,162,499,241,131
230 242,390,162,499,241,115
231 243,390,162,499,241,81
232 244,390,162,499,241,48
233 245,390,162,499,241,23
234 246,390,162,499,241,7