{"abstract":"Passing depth testing overrides a disabled depth write mask.","category":"Rendering state","checks":4,"contract":"Update a scalar depth buffer only if fragment depth testing passed and depth writes are enabled.","contract_signature":"old, incoming, test_passed, write_enabled","evaluation_group":"xg-depth-write-independent-test","failed_approach":"Enabled writes incorrectly commit depth for rejected fragments.","family":"xg-depth-write-independent-test","id":"FA-10691","implementations":{"attempt":{"sha256":"76369ec80fa0c55ce033c4b367726197c09de63fffc66416d1a6e989de685a6a","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(old, incoming, test_passed, write_enabled):\n    return incoming if write_enabled else old\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve(*(0.5, 0.25, True, False)), 0.5)\ncheck('fixture 2', solve(*(0.5, 0.25, False, True)), 0.5)\ncheck('fixture 3', solve(*(0.5, 0.25, True, True)), 0.25)\ncheck('fixture 4', solve(*(0.5, 0.25, False, False)), 0.5)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"a77bf9c25e518f8b269ad3e915611baf0c19e34bf3c0d3c3ab1aeb4371a780be","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(old, incoming, test_passed, write_enabled):\n    return incoming if test_passed else old\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve(*(0.5, 0.25, True, False)), 0.5)\ncheck('fixture 2', solve(*(0.5, 0.25, False, True)), 0.5)\ncheck('fixture 3', solve(*(0.5, 0.25, True, True)), 0.25)\ncheck('fixture 4', solve(*(0.5, 0.25, False, False)), 0.5)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" 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.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xg-depth-write-independent-test","generated_at":"2026-09-29T14:38:41.247362+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A deterministic software graphics stage with explicit channel and coordinate conventions; no hardware, device profile or API behavior is inferred.","root_cause":"Passing depth testing overrides a disabled depth write mask.","sha256":"bd595c17d94c0ed74a96a9a61b0edd6f25310adc7418d45c17de6fd36eae0245","title":"Depth write independent test · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":40.448,"exit_code":1,"observations":[{"actual":0.5,"check":"fixture 1","expected":0.5,"passed":true},{"actual":0.25,"check":"fixture 2","expected":0.5,"passed":false},{"actual":0.25,"check":"fixture 3","expected":0.25,"passed":true},{"actual":0.5,"check":"fixture 4","expected":0.5,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": 0.5, \"expected\": 0.5, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": 0.25, \"expected\": 0.5, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 0.25, \"expected\": 0.25, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 0.5, \"expected\": 0.5, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.485,"exit_code":1,"observations":[{"actual":0.25,"check":"fixture 1","expected":0.5,"passed":false},{"actual":0.5,"check":"fixture 2","expected":0.5,"passed":true},{"actual":0.25,"check":"fixture 3","expected":0.25,"passed":true},{"actual":0.5,"check":"fixture 4","expected":0.5,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": 0.25, \"expected\": 0.5, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": 0.5, \"expected\": 0.5, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": 0.25, \"expected\": 0.25, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 0.5, \"expected\": 0.5, \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}