Repository Analysis

hajimehoshi/ebiten

A dead simple 2D game engine for Go

5.2 Low AI signal View on GitHub

Analysis Overview

This report presents the forensic synthetic code analysis of hajimehoshi/ebiten, a Go project with 13,333 GitHub stars. SynthScan v2.0 examined 173,653 lines of code across 803 source files, recording 911 pattern matches distributed across 3 syntactic categories. The overall adjusted score of 5.2 places this repository in the Low AI signal band.

The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).

5.2
Adjusted Score
5.2
Raw Score
100%
Time Factor
2026-07-14
Last Push
13.3K
Stars
Go
Language
173.7K
Lines of Code
803
Files
911
Pattern Hits
2026-07-14
Scan Date
0.00
HC Hit Rate

What These Metrics Mean

Adjusted Score
Primary synthetic code indicator. Raw score normalised per 1,000 lines of code and multiplied by the temporal discount factor. This is the definitive comparative metric — use it to rank repositories by AI authorship density.
Raw Score
The unmodified sum of all severity-weighted, context-multiplied pattern match scores before temporal discounting. Reflects the absolute signal strength independent of when the repository was last active.
Time Factor
The temporal discount multiplier (0–100%) applied to the raw score. Repositories last updated before ChatGPT's launch (Nov 2022) receive a 5% factor. Full signal is only assigned to repositories active in the post-adoption era (Jan 2024+).
Pattern Hits
Total count of individual pattern matches across all files and categories. A high hit count with a low score may indicate a very large codebase with isolated AI snippets; a low count with a high score indicates dense, concentrated AI signatures.
HC Hit Rate
High+Critical pattern hits per file, averaged across the repository. This orthogonal signal catches repositories where a few files are densely packed with high-severity AI tells — a strong indicator even when the normalised score appears moderate due to codebase size.
Lines of Code / Files
Total lines and files analysed. The scanner examines 94 file extensions. These denominators are used to normalise the score, enabling fair comparison between repositories of vastly different sizes.

Score History

This chart maps the temporal evolution of the adjusted synthetic code score across successive scan runs. An upward trajectory indicates ongoing incorporation of AI-generated code or expanding LLM-assisted scaffolding; a stable or declining trajectory may reflect active human refactoring, code removal, or the adoption of stricter authorship policies. The dashed secondary line (right axis) independently tracks total raw pattern hit count, which can diverge from the normalised score when codebase size changes significantly between scans.

Severity Breakdown

Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.

CRITICAL 0HIGH 0MEDIUM 0LOW 911

Directory Score Breakdown

This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.

Pattern Findings

The scanner identified 911 distinct pattern matches across 3 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.

Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.

Over-Commented Block909 hits · 894 pts
SeverityFileLineSnippetContext
LOWgeom_test.go1// Copyright 2014 Hajime HoshiCOMMENT
LOWgenerate.go1// Copyright 2015 Hajime HoshiCOMMENT
LOWgenerate.go21//COMMENT
LOWwindow.go1// Copyright 2019 The Ebiten AuthorsCOMMENT
LOWwindow.go41COMMENT
LOWwindow.go61func SetWindowDecorated(decorated bool) {COMMENT
LOWwindow.go121}COMMENT
LOWwindow.go141// If no images are specified, the window reverts to its default icon.COMMENT
LOWwindow.go161//COMMENT
LOWwindow.go201// SetWindowSize does nothing on other environments.COMMENT
LOWwindow.go241//COMMENT
LOWwindow.go261//COMMENT
LOWwindow.go301}COMMENT
LOWwindow.go321// SetWindowClosingHandled works only on desktops.COMMENT
LOWwindow.go341// in order to make the mouse cursor passthrough the window.COMMENT
LOWwindow.go361//COMMENT
LOWcolorm.go1// Copyright 2014 Hajime HoshiCOMMENT
LOWcolorm.go21)COMMENT
LOWcolorm.go121// hueTheta is a radian value to rotate hue.COMMENT
LOWshader_test.go1// Copyright 2020 The Ebiten AuthorsCOMMENT
LOWmousebuttons.go1// Copyright 2015 Hajime HoshiCOMMENT
LOWgameforui.go1// Copyright 2014 Hajime HoshiCOMMENT
LOWmonitor.go1// Copyright 2023 The Ebitengine AuthorsCOMMENT
LOWshader.go1// Copyright 2020 The Ebiten AuthorsCOMMENT
LOWebiten_test.go1// Copyright 2024 The Ebitengine AuthorsCOMMENT
LOWimagetobytes_test.go1// Copyright 2016 The Ebiten AuthorsCOMMENT
LOWcolormode.go1// Copyright 2026 The Ebitengine AuthorsCOMMENT
LOWcolormode.go41//COMMENT
LOWrun.go1// Copyright 2014 Hajime HoshiCOMMENT
LOWrun.go41 // An actual TPS is available by ActualTPS(), and the result might slightly differ from your expected TPS,COMMENT
LOWrun.go61 // Draw draws the game screen by one frame.COMMENT
LOWrun.go81 // It is ensured that Layout is invoked before Update is called in the first frame.COMMENT
LOWrun.go121 // even if the Ebitengine major version is not updated.COMMENT
LOWrun.go141// ActualFPS returns the current number of FPS (frames per second), that representsCOMMENT
LOWrun.go181// SetScreenFilterEnabled enables/disables the use of the "screen" filter Ebitengine uses.COMMENT
LOWrun.go201func IsScreenFilterEnabled() bool {COMMENT
LOWrun.go221// RunGame must be called on the main thread.COMMENT
LOWrun.go241}COMMENT
LOWrun.go261COMMENT
LOWrun.go281COMMENT
LOWrun.go301 // This is useful for GUI applications, but some APIs like [AppendInputChars]'s behavior is changed:COMMENT
LOWrun.go321 // When the game runs as a virtualization guest, GraphicsLibrary is ignored, and the graphicsCOMMENT
LOWrun.go341// If game does not implement FinalScreenDrawer, the default rendering for the final screen is used.COMMENT
LOWrun.go401//COMMENT
LOWrun.go421}COMMENT
LOWrun.go441func SetCursorMode(mode CursorModeType) {COMMENT
LOWrun.go461//COMMENT
LOWrun.go481// IsFocused is concurrent-safe.COMMENT
LOWrun.go501//COMMENT
LOWrun.go561 // Be careful that FPSModeVsyncOffMaximum might consume a lot of battery power.COMMENT
LOWrun.go581)COMMENT
LOWrun.go601COMMENT
LOWrun.go621// Deprecated: as of v2.4. Use TPS instead.COMMENT
LOWrun.go641 return ActualTPS()COMMENT
LOWrun.go681 return screenTransparent.Load()COMMENT
LOWrun.go761COMMENT
LOWrun.go781COMMENT
LOWblend.go1// Copyright 2022 The Ebitengine AuthorsCOMMENT
LOWblend.go21)COMMENT
LOWblend.go101 // BlendFactorOne is a factor:COMMENT
849 more matches not shown…
TODO Padding1 hit · 2 pts
SeverityFileLineSnippetContext
LOWinternal/atlas/image_test.go916// TODO: Add tests to extend image on an atlas out of the main loopCOMMENT
Structural Annotation Overuse1 hit · 2 pts
SeverityFileLineSnippetContext
LOWinternal/glfw/glx_context_linbsd.go330 // NOTE: This function must not call any X11 functions, as it is calledCOMMENT