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import numpy as np
from pyiga import bspline, geometry, assemble, approx

def L2ErrEstimator_vf(dim):
    from pyiga.vform import VForm, div, grad, dx, tree_print
    vf = VForm(dim, arity=1)
    u = vf.input('u')
    v = vf.basisfuns()
    Lu = div(grad(u, parametric=True), parametric=True)
    vf.add(Lu**2 * v * dx)

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import numpy as np
import scipy.signal

def discrete_remez(f, V, tol=1e-12, maxiter=1000, startnodes=None):
    """Best uniform approximation of the vector f by a linear combination of the columns of V.
    Uses a discrete Remez algorithm with single point exchange.
    
    If it converges, this function returns a vector c such that V.dot(c) is the best uniform
    approximation to f.
    """

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5bc241c More optimizations to bumper rendering, uses index and vertex buffers throughout now.
2b6a7df Light rendering optimized more.
ebb564c Forgot to remove some TODOs which are done.
ae83fa3 Many simplifications and optimizations to gate rendering.
73d63ad Disabled Graphics Memory display during F11 for now.
ade903a Implemented vertex buffer caching.
f99ba56 Forgot to mention screen shake.
f426c5c Removed some more old renderer stuff.
e894901 Removed SetColorKeyEnabled() completely (was no longer used anyway).
c2b43a4 Bugfix: starting a table twice may cause a D3D error (reported by DHogsett). Reason: decal VB was not freed.