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FA-10711 / Rendering state / Open access

Texture unit binding isolation · case 01

Binding a texture replaces the complete texture-unit map.

Verified by executionVariant 1 · 4 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Binding a texture replaces the complete texture-unit map.

THE FAILURE

Binding a texture replaces the complete texture-unit map.

Unsuccessful approach: Broadcasting the new texture changes unrelated units and fails to add a new unit.

Case contract

Texture units are string keys. Bind one texture ID or None to the selected unit while retaining all other bindings.

Why this case matters

A deterministic software graphics stage with explicit channel and coordinate conventions; no hardware, device profile or API behavior is inferred.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json
import math
N = 1
observations = []
def solve(bindings, unit, texture):
    return {unit:texture}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve(*({'0': 'a', '1': 'b'}, '0', 'c')), {'0': 'c', '1': 'b'})
check('fixture 2', solve(*({}, '2', 'x')), {'2': 'x'})
check('fixture 3', solve(*({'0': 'a'}, '1', None)), {'0': 'a', '1': None})
check('fixture 4', solve(*({'0': 'a'}, '0', 'a')), {'0': 'a'})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
fixture 1{'0': 'c'}{'0': 'c', '1': 'b'}Failed
fixture 2{'2': 'x'}{'2': 'x'}Passed
fixture 3{'1': None}{'0': 'a', '1': None}Failed
fixture 4{'0': 'a'}{'0': 'a'}Passed

SHA-256 / 4d45056df8738bc1e947438a3e7d9814fa37845fc2be5415b5068f7b36626abe

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json
import math
N = 1
observations = []
def solve(bindings, unit, texture):
    return {k:texture for k in bindings}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve(*({'0': 'a', '1': 'b'}, '0', 'c')), {'0': 'c', '1': 'b'})
check('fixture 2', solve(*({}, '2', 'x')), {'2': 'x'})
check('fixture 3', solve(*({'0': 'a'}, '1', None)), {'0': 'a', '1': None})
check('fixture 4', solve(*({'0': 'a'}, '0', 'a')), {'0': 'a'})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
fixture 1{'0': 'c', '1': 'c'}{'0': 'c', '1': 'b'}Failed
fixture 2{}{'2': 'x'}Failed
fixture 3{'0': None}{'0': 'a', '1': None}Failed
fixture 4{'0': 'a'}{'0': 'a'}Passed

SHA-256 / e2fa84fd708f38d464f9fbc0ca652fa9c28e6b30a4080d260eac400f601c9376

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 4 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

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Verification & scope

This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:38:41.547983+00:00.

Case digest / 4e6539823627074c97631dc47ea59236237d50543765a1f1b83e44f0dff807e5