void BuildVariations( MeshVariantMap &variantMap, const std::vector<int> &components,
const VertexFormat &fmt, GLuint indexBuffer )
{
const int numVariations = (int)std::pow(2.0f, (float)components.size());
std::vector<GLuint> vaos(numVariations);
gl::GenVertexArrays(numVariations, &vaos[0]);
for(int variant = 0; variant < numVariations; ++variant)
{
gl::GenVertexArrays(1, &vaos[variant]);
gl::BindVertexArray(vaos[variant]);
gl::BindBuffer(gl::ELEMENT_ARRAY_BUFFER, indexBuffer);
fmt.BindAttribute(0, 0);
int variation = 0;
for(size_t comp = 0; comp < components.size(); ++comp)
{
if(variant & (0x1 << comp))
{
variation |= components[comp];
fmt.BindAttribute(0, comp + 1);
}
}
AddVariantToMap(variantMap, vaos[variant], variation);
}
gl::BindVertexArray(0);
}
