def get_shader_index(mats, mat):
    for i in range(len(mats)):
        if mats[i] == mat:
            return i


def geometry_from_object(obj, mats, bones=None, export_settings=None):
    geometry = GeometryItem()

    geometry.shader_index = get_shader_index(mats, obj.active_material)

    obj, mesh = apply_and_triangulate_object(obj)

    bbmin, bbmax = get_bound_extents(obj, world=export_settings.use_transforms)
    geometry.bounding_box_min = bbmin
    geometry.bounding_box_max = bbmax

    shader_name = obj.active_material.shader_properties.name
    shader = ShaderManager.shaders[shader_name]

    layout = shader.get_layout_from_semantic(
        get_semantic_from_object(shader, mesh))

    geometry.vertex_buffer.layout = layout.value
    vertex_buffer, index_buffer = get_mesh_buffers(
        obj, mesh, layout.vertex_type, bones, export_settings)

    geometry.vertex_buffer.data = vertex_buffer
    geometry.index_buffer.data = index_buffer

    return geometry


def drawable_model_from_object(obj, bones=None, export_settings=None):
    drawable_model = DrawableModelItem()

    drawable_model.render_mask = obj.drawable_model_properties.render_mask
    drawable_model.flags = obj.drawable_model_properties.flags

    # rawable_model.bone_index = 0
    if bones is not None:
        drawable_model.has_skin = 1
        drawable_model.unknown_1 = len(bones)

    for child in obj.children:
        if child.sollum_type == SollumType.DRAWABLE_GEOMETRY:
            if len(child.data.materials) > 1:
                # Preserve original order of materials
                mats = child.data.copy().materials
                objs = split_object(child, obj)
                for obj in objs:
                    geometry = geometry_from_object(
                        obj, mats, bones, export_settings)  # MAYBE WRONG ASK LOYALIST
                    drawable_model.geometries.append(geometry)
                join_objects(objs)
            else:
                geometry = geometry_from_object(
                    child, get_used_materials(obj.parent), bones, export_settings)
                drawable_model.geometries.append(geometry)

    return drawable_model