public static int GfxFVFOffset(int fvfFlags, int a2)
{
    int result = 0;

    if (a2 != 0x2)
    {
        result += 12;

        if (a2 != 0x10)
        {
            if ((fvfFlags & 0x10) != 0 /*D3DFVF_NORMAL*/ )
            {
                result = 24;
            }
            if ((fvfFlags & 0x20) != 0 /*D3DFVF_PSIZE*/ )
            {
                result += 4;
            }
            if (a2 != 0x40)
            {
                if ((fvfFlags & 0x40) != 0 /*D3DFVF_DIFFUSE*/ )
                {
                    result += 4;
                }
                if ((fvfFlags & 0x80) != 0 /*D3DFVF_SPECULAR*/ )
                {
                    result += 4;
                }
                if (a2 != 0x100)
                {
                    result += 8;
                }
            }
        }
    }

    return result / 4;
}

static int[] GfxBaseFVFSizes = { 0, 0, 12, 0, 16, 0, 16, 0, 20, 0, 24, 0, 28, 0, 32, 0 };

public static int GfxFVFSize(int fvfFlags)
{
    int result = GfxBaseFVFSizes[fvfFlags & 0xF];

    if ((fvfFlags & 0x10) != 0 /*D3DFVF_NORMAL*/ )
    {
        result += 12;
    }
    if ((fvfFlags & 0x20) != 0 /*D3DFVF_PSIZE*/ )
    {
        result += 4;
    }
    if ((fvfFlags & 0x40) != 0 /*D3DFVF_DIFFUSE*/ )
    {
        result += 4;
    }
    if ((fvfFlags & 0x80) != 0 /*D3DFVF_SPECULAR*/ )
    {
        result += 4;
    }
    if ((fvfFlags & 0x100) != 0)                 // 0x100
    {
        result += 8;
    }
    if ((fvfFlags & 0x200) != 0)                 // 0x200
    {
        result += 8;
    }

    return result / 4;
}

public class GfxPacket
{
    public int Type;
    public float[] Vertices;
    public int[] Indices;
}

public class ModStatic
{
    public int Fvf;
    public List<GfxPacket> Packets;
    public List<int> ShaderIndices;
}

public static ModStatic ReadModStatic(BinaryReader reader)
{
    var result = new ModStatic();

    var packetCount = reader.ReadInt32();

    if ((packetCount & 0x80) != 0)
    {
        packetCount &= 0x7F;

        result.Fvf = reader.ReadInt32();
        result.ShaderIndices = reader.ReadBytes(packetCount).Select(x => (int) x).ToList();
    }
    else
    {
        var expectedVertices = reader.ReadInt32();
        var expectedIndices  = reader.ReadInt32();
        var expectedPackets  = reader.ReadInt32();
        var fvf = reader.ReadInt32();

        result.Fvf = fvf;
        result.Packets = new List<GfxPacket>();
        result.ShaderIndices = new List<int>();

        var fvfOffset = GfxFVFOffset(fvf, 0x40);
        var fvfSize = GfxFVFSize(fvf);

        var totalVerts = 0;
        var totalIndices = 0;

        for (int i = 0; i < packetCount; ++i)
        {
            var stripCount = reader.ReadInt32();

            result.ShaderIndices.Add(reader.ReadInt32());

            for (int j = 0; j < stripCount; ++j)
            {
                var type = reader.ReadInt32();
                var vertCount = reader.ReadInt32();

                var verts = new float[fvfSize * vertCount];

                for (int k = 0; k < vertCount; ++k)
                {
                    for (int l = 0; l < fvfSize; ++l)
                    {
                        verts[(k * fvfSize) + l] = reader.ReadSingle();
                    }

                    if ((fvf & 0x40) != 0)
                    {
                        verts[(k * fvfSize) + fvfOffset] = SwapEndian(verts[(k * fvfSize) + fvfOffset]);
                    }
                }

                var indicesCount = reader.ReadInt32();
                var indices = new int[indicesCount];

                for (int k = 0; k < indices.Length; ++k)
                {
                    indices[k] = reader.ReadUInt16();
                }

                result.Packets.Add(new GfxPacket
                {
                    Type = type,
                    Vertices = verts,
                    Indices = indices
                });

                totalVerts += vertCount;
                totalIndices += indicesCount;
            }
        }

        Console.WriteLine("Verts:   {0,3} (expected {1,3})", totalVerts,   expectedVertices);
        Console.WriteLine("Indices: {0,3} (expected {1,3})", totalIndices, expectedIndices);
        Console.WriteLine("Packets: {0,3} (expected {1,3})", packetCount,  expectedPackets);
    }

    return result;
}