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Blitter 0.7.0

Blitter

Blitter is a small, friendly 2D & 3D graphics programming library for .NET, built on top of SDL3 (via the SDL3-CS bindings) and integrated with SkiaSharp. It wraps SDL3 in clean, idiomatic C# so you can focus on drawing things and making them move instead of wrestling with native interop and low-level GPU concepts.

⚠️ Early days. Blitter is in ongoing development. The API will likely go through changes. Use at your own risk — and have fun.

What's in the box

• Window2D - simple 2D rendering
• Window3D - GPU-accelerated 3D rendering
• SkiaSharp - integration for advanced 2D rendering
• Input - keyboard, mouse, gamepad, and touch via simple events
• Audio - load, play & mix wav, mp3 and ogg sound files
• Images - load, save, manipulate pixels, apply filters
• Shaders - load, save, dynamic compilation
• Blitter.Bits - beyond the basics: useful tidbits for graphical apps
• Blitter.Blocks2D - building blocks to compose scenes, sprites, behaviors and more.
• Blitter.Blocks3D - Similar to Blocks2D, but with even more D.

A 2D example

A bouncing red square.

using Blitter;

var window = new Window2D(800, 600)
{
 Title = "Bouncing Square",
 BackgroundColor = Color.Black,
 CloseKey = Key.Escape
};

float x = 0, vx = 200; // pixels per second

await window.RunAsync(rd =>
{
 x += vx * rd.ElapsedSecondsSinceLastRender;

 if (x < 0 || x > window.Size.Width - 100) 
 vx = -vx;

 rd.DrawColor = Color.Red;
 rd.DrawFillRect(new Rect(x, 250, 100, 100));
});

A 3D example

A spinning, colored triangle rendered with a built-in shader.

using System.Numerics;
using Blitter;

var triangle = Mesh.Create<ColorVertex3D>(
[
 new(new Vertex3D( 0.0f, 0.5f, 0f), Color.Red),
 new(new Vertex3D( 0.5f, -0.5f, 0f), Color.Green),
 new(new Vertex3D(-0.5f, -0.5f, 0f), Color.Blue),
]);

var window = new Window3D
{
 Title = "Spinning Triangle",
 BackgroundColor = Color.Black,
 FullScreen = true,
 CloseKey = Key.Escape
};

await window.RunAsync(r =>
{
 var transform = Matrix4x4
 .CreateRotationZ(r.ElapsedSecondsSinceStart)
 .Scale(0.8f);

 r.DrawMesh(triangle, transform);
});

Learn more

For full documentation and samples see the project repository:

https://github.com/mattwar/Blitter

The samples/ folder contains runnable single-file examples covering meshes, textures, blend/depth/cull modes, debug text, split-screen, render-to-image, and more.

License

MIT. See LICENSE and THIRD-PARTY-NOTICES.md in the repository.