GPU-based 2D graphics rendering in rust.
For now the goal is to provide efficient SVG-compliant path tessellation tools to help with rendering vector graphics on the GPU. If things go well the project could eventually grow into including a (partial) SVG renderer in a separate crate, but for now think of this library as a way to turn complex paths into triangles for use in your own rendering engine.
The intent is for this library to be useful in projects like Servo and games.
```rust // Build a Path. let mut builder = SvgPathBuilder::new(Path::builder()); builder.moveto(point(0.0, 0.0)); builder.lineto(point(1.0, 0.0)); builder.quadraticbezierto(point(2.0, 0.0), point(2.0, 1.0)); builder.cubicbezierto(point(1.0, 1.0), point(0.0, 1.0), point(0.0, 0.0)); builder.close(); let path = builder.build();
// Will contain the result of the tessellation.
let mut geometry_cpu: VertexBuffers<Vec2> = VertexBuffers::new();
let mut tessellator = FillTessellator::new();
{
// The simple builder uses the tessellator's vertex type.
// You can implement the GeometryBuilder trait to create custom vertices.
let mut vertex_builder = simple_builder(&mut geometry_cpu);
// Compute the tessellation.
tessellator.tessellate_path(
path.path_iter().flattened(0.1),
&FillOptions::default(),
&mut vertex_builder
).unwrap();
}
// The tessellated geometry is ready to be uploaded to the GPU.
println!(" -- {} vertices {} indices",
geometry_cpu.vertices.len(),
geometry_cpu.indices.len()
);
```
cargo doc at the root of the repository.The project is split into small crates: * lyon (documentation): A meta-crate that imports the other crates. * lyontessellator (documentation): The tessellation routines (where most of the focus is for now). * lyonpathiterator (documentation): A set of iterator abstractions over vector paths. * lyonpathbuilder (documentation): Tools to build paths. * lyonpath (documentation): A simple vector path data structure provided for convenience, but not required by the other crates. * lyonbezier (documentation): 2d quadratic and cubic bezier curve maths, including an efficient flattening algorithm. * lyoncore (documentation): Contains types common to most lyon crates. * lyon_extra (documentation): various optional utilities.
There is also a toy command-line tool exposing to tessellate SVG path from your favorite terminal.
Have a look at the gfx-rs example to see how integrating the tessellators in a renderer can look like.
The focus right now is on implementing a SVG compliant path tessellator (rather than an actual SVG render).
There are the unticked items above as well as a rough list of things to do. If you are interested in contributing, please let me know on twitter (@nicalsilva) or by e-mail.
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