static VertexFormat GetVertexFormat (VertexFlags flags, int boneSlotCount) {
uint elemCount = 0, f = (uint)flags;
for (elemCount = 0; f != 0; elemCount++)
f &= f - 1;
var elems = new VertexElement[(int)elemCount + 1 + (boneSlotCount * 2)];
int offset = 3, idx = 1;
elems[0] = new VertexElement("Position", 0, 3);
if ((flags & VertexFlags.Normal) != 0) {
elems[idx++] = new VertexElement("Normal", offset, 3);
offset += 3;
}
for (var i = 0; i < 4; i++) {
if (((int)flags & ((int)VertexFlags.TexCoord0 << i)) != 0) {
elems[idx++] = new VertexElement("TexCoord" + i, offset, 2);
offset += 2;
}
}
for (var i = 0; i < 4; i++) {
if (((int)flags & ((int)VertexFlags.Color0 << i)) != 0) {
elems[idx++] = new VertexElement("Color" + i, offset, 4);
offset += 4;
}
}
for (var i = 0; i < boneSlotCount; i++)
elems[idx++] = new VertexElement("BoneWeight" + i, offset++, 1);
for (var i = 0; i < boneSlotCount; i++)
elems[idx++] = new VertexElement("BoneIndex" + i, offset++, 1);
return new VertexFormat(offset, elems);
}
