Expose a zero allocation API to Godot C# bindings
### Describe the project you are working on Godot C# bindings ### Describe the problem or limitation you are having in your project For the past weeks, I've been discussing with several Unity users intending to move to Godot C# regarding dealing with the C# garbage collector. The most common complaint I hear from users is that, in Unity, allocations can trigger unexpected GC spikes into the game. In Godot, we target to make all of the high performance APIs (those that intended to be called every frame) not allocate any memory, so theoretically the GC should not be a problem. Additionally, Godot starting from 4.0, uses the Microsoft CoreCLR version of .net, which also supposedly has a better garbage collector than Unity. But in all, after several discussions with Unity users, neither is enough reassurance for them, and they would really feel safer if Godot exposed a zero allocation API. ### Describe the feature / enhancement and how it helps to overcome the problem or limitation The idea of this proposal is that Godot exposes zero allocation versions of many functions in the C# API, that users can use if they desire. Technically, this could be done from the binding generator itself, without breaking compatibility, and without doing any modification to Godot itself. ### Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams **WARNING** I am not familiar with C#, so take this as pseudocode. Imagine you have two functions exposed as to C#: ```C# void MyClass.SetArray( Vector2[] array); Vector2[] MyClass.GetArray(); ``` This works and is pretty and intuitive. However, it has two problems: * GC is allocated on return * Memory is copied to Godot native formats every time there is a call. The idea is to add NoAlloc versions, which can be generated directly by the binder automatically when required: ```C# void MyClass.SetArrayNoAlloc( Godot.Collections.PackedVector2Array array); void MyCl
FL score
out of 100
Verdict
medium confidence
Competition
0
competitors found, emerging market
Trend
No signal yet
A high-impact technical solution for Godot C# developers struggling with GC spikes, but monetization and solo buildability are significant challenges.
The pain
The gap
Build angle
Strengths
- Addresses a deeply felt, critical performance problem for a specific user segment (Godot C# game developers).
- Clear, measurable value proposition (no GC spikes, smoother performance).
- Strong demand signals from community discussions and proposals.
- Solution is technically feasible within the binding generator itself.
- Market for high-performance game development is growing.
Risks
- High technical complexity requiring deep knowledge of Godot internals and C# binding generation.
- Monetization as a standalone product is difficult; it's perceived as a core engine feature.
- Risk of Godot officially implementing this proposal, rendering a third-party product redundant.
- Limited compound value for solo builders outside of direct engine contribution.
- Audience, while specific, is niche within the broader game development ecosystem.
Next steps
- Engage directly with the Godot C# community and core developers on the existing GitHub proposal to understand their plans and gauge reception for a community-driven or commercial solution.
- Build a proof-of-concept for a few critical API functions to demonstrate the performance benefits of zero-allocation bindings.
- Explore potential monetization models: Could it be a premium plugin on the Godot Asset Store? A specialized performance library? Or is it best contributed directly to Godot as an open-source project?
- Interview target users (Unity C# developers migrating to Godot) to understand if they would pay for this solution if it were available outside of the core engine.
Fly Labs Method
Is the pain real, is there a gap, is it the right time, can one person build it.
- Problem clarity
- 27
- Solution gap
- 24
- Willingness to pay
- 21
- Buildability
- 12
High-impact technical problem with clear demand but high technical barrier and potentially tricky monetization as a standalone product.
Value Equation
Dream outcome and how likely it feels, against the time and effort it costs.
Strong problem and timing but challenging for standalone monetization and go-to-market due to technical complexity and expected integration.
One-Person Business
Curiosity pull, identity fit, and a path from free value to paid for a solo creator.
Clear problem, but highly technical niche solution with low creator fit and difficult monetization for a solo builder.
Viral Frameworks
Hook strength, shareability, and how cheaply it can be tested.
Clear value but high assumption risk and difficult business model for a micro-SaaS due to its foundational nature.
Builder Lens
Evidence the problem exists, timing, defensibility, and a model that fits on a napkin.
Strong demand for a clear problem, with clear user segments and future relevance, but initial implementation needs to be tightly focused.
Why this verdict
Five lenses, one composite. How scoring works
The angle
This weekend
- Engage directly with the Godot C# community and core developers on the existing GitHub proposal to understand their plans and gauge reception for a community-driven or commercial solution.
- Build a proof-of-concept for a few critical API functions to demonstrate the performance benefits of zero-allocation bindings.
- Explore potential monetization models: Could it be a premium plugin on the Godot Asset Store? A specialized performance library? Or is it best contributed directly to Godot as an open-source project?
- Interview target users (Unity C# developers migrating to Godot) to understand if they would pay for this solution if it were available outside of the core engine.
What they charge
Recent news
State of GDScript vs C# performance in Godot 4.0 - Archive
vertexaisearch.cloud.google.com, August 12 2022
Expose a zero allocation API to Godot C# bindings · Issue #7842 - GitHub
github.com, September 24 2023
Zero allocation code in C# and Unity - Seba's Lab
vertexaisearch.cloud.google.com, December 15 2019
Godot 4.3 Performance: Part 2 - Compare C++, C#, Java, GDScript - YouTube
youtube.com, October 04 2024
Memory management of Godot (C++) objects in C# - Stack Overflow
stackoverflow.com, December 20 2024
Market signals
The demand for zero-allocation APIs in game development, particularly within C# environments like Unity and Godot, is a growing niche. Developers are increasingly focused on minimizing garbage collection (GC) overhead to prevent performance spikes and ensure smooth gameplay, especially for performance-critical applications. Recent discussions and proposals within the Godot community highlight a strong desire for more control over memory management, indicating a maturing understanding of performance bottlenecks in C# game development. This focus on optimization suggests a market that values high-performance tooling and libraries.
What frustrates people
- Users complain that allocations in Unity can trigger unexpected GC spikes, impacting game performance.
- Godot C# performance can be significantly slower than GDScript or C++ in performance-critical sections due to marshalling and GC overhead.
- Memory is copied between C# and C++ Godot native formats with every API call, leading to allocations.
- Godot C# bindings do not expose low-level API access, making it difficult to achieve zero allocations.
- The garbage collector in C# can cause noticeable frame drops and stalls, especially with frequent small allocations.
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