{"abstract":"Additive blend writes values above the normalized render-target maximum.","category":"Raster compositing","checks":4,"contract":"Return saturated additive blending for normalized nonnegative channel inputs.","contract_signature":"source, destination","evaluation_group":"xg-plus-blend-clamps-channel","failed_approach":"Maximum blending drops additive energy below saturation.","family":"xg-plus-blend-clamps-channel","id":"FA-10576","implementations":{"attempt":{"sha256":"5d9447a4eea7a90b8181a42d7bb5656f26a94c00aab8b3635d9b8671dd4d4ec0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(source, destination):\n    return max(source,destination)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve(*(0.75, 0.5)), 1)\ncheck('fixture 2', solve(*(0.25, 0.5)), 0.75)\ncheck('fixture 3', solve(*(0, 0)), 0)\ncheck('fixture 4', solve(*(1, 0)), 1)\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":"2b7a5fc723b65141598ae306dfcf43b3bdfe5308946f4e924899fccd18ddcc43","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(source, destination):\n    return source+destination\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve(*(0.75, 0.5)), 1)\ncheck('fixture 2', solve(*(0.25, 0.5)), 0.75)\ncheck('fixture 3', solve(*(0, 0)), 0)\ncheck('fixture 4', solve(*(1, 0)), 1)\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-plus-blend-clamps-channel","generated_at":"2026-09-29T14:38:40.302886+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":"Additive blend writes values above the normalized render-target maximum.","sha256":"a0e47e2499bdd25a965905053f253a913d267f91bed485dc359ce83ce5166bb2","title":"Plus blend clamps channel · 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":38.617,"exit_code":1,"observations":[{"actual":0.75,"check":"fixture 1","expected":1,"passed":false},{"actual":0.5,"check":"fixture 2","expected":0.75,"passed":false},{"actual":0,"check":"fixture 3","expected":0,"passed":true},{"actual":1,"check":"fixture 4","expected":1,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": 0.75, \"expected\": 1, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": 0.5, \"expected\": 0.75, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 1, \"expected\": 1, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.024,"exit_code":1,"observations":[{"actual":1.25,"check":"fixture 1","expected":1,"passed":false},{"actual":0.75,"check":"fixture 2","expected":0.75,"passed":true},{"actual":0,"check":"fixture 3","expected":0,"passed":true},{"actual":1,"check":"fixture 4","expected":1,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": 1.25, \"expected\": 1, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": 0.75, \"expected\": 0.75, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 1, \"expected\": 1, \"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."}}