2 questions about VertexArray / VertexBuffer

[Nafffen]

1. With Primitives Triangles, is there a way to specify all points then specify index of points used for each triangles ? Or the API just allows passing triangles directly by coords ?

2. With other than Triangles, is there a way to "reset" the primitive, for example with sf::TriangleFan, start a new TriangleFan in another location, but they will be drawn from the same VertexArray

Thank you

[Garwin]

You can both, look at the documentation.

void    draw (const Vertex *vertices, std::size_t vertexCount, PrimitiveType type, const RenderStates &states=RenderStates::Default)

So you can use any container/build in array of sf::Vertex that uses continuous memory.  Just pass to draw call the pointer to the first Vertex, number of vertices, and primitive type.

But as for each PrimitiveType you need a separate draw call, it does not bring the advantage of limiting draw calls.

[Hapax]

1) No, I don't think SFML provides an interface for indexed vertices. You can, however, use raw OpenGL directly alongside your SFML if you really need indexing.

2) No. The primitive is set per draw call so the only ways to do that is to draw multiple (separate) triangle fans or to convert the triangle fans into triangles first.

Actually, thinking about that answer to part 2, I've just remembered that I've created an automatic function to do just that and it's on the SFML wiki here:
https://github.com/SFML/SFML/wiki/Source%3A-Triangles-Extractor

There's some extra information on an SFML thread post about it here too:
https://en.sfml-dev.org/forums/index.php?topic=29292

[eXpl0it3r]

As Hapax said, we're currently not supporting indexed vertices and you can't change primitive types on the go.

With the removal of sf::Quads this causes even more pain, if you have to use sf::Triangles and duplicate vertices more than necessary, so eventually we might add indexed vertices.