ryujinx_ryubing/src/Ryujinx.Graphics.Shader/InputTopology.cs

namespace Ryujinx.Graphics.Shader
{
    public enum InputTopology : byte
    {
        Points,
        Lines,
        LinesAdjacency,
        Triangles,
        TrianglesAdjacency,
    }

    static class InputTopologyExtensions
    {
        extension(InputTopology topology)
        {
            public string GlslString => topology switch
            {
                InputTopology.Points => "points",
                InputTopology.Lines => "lines",
                InputTopology.LinesAdjacency => "lines_adjacency",
                InputTopology.Triangles => "triangles",
                InputTopology.TrianglesAdjacency => "triangles_adjacency",
                _ => "points",
            };
            
            public int InputVertexCount => topology switch
            {
                InputTopology.Points => 1,
                InputTopology.Lines => 2,
                InputTopology.LinesAdjacency => 4,
                InputTopology.Triangles => 3,
                InputTopology.TrianglesAdjacency => 6,
                _ => 1,
            };
            
            public int InputVertexCountNoAdjacency => topology switch
            {
                InputTopology.Points => 1,
                InputTopology.Lines or
                    InputTopology.LinesAdjacency => 2,
                InputTopology.Triangles or
                    InputTopology.TrianglesAdjacency => 3,
                _ => 1,
            };
        }
    }
}