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import unittest
import random
import math
import os
from IECore import *

class GammaOp( ColorTransformOp ) :

	def __init__( self, gamma = 1.0 ) :

		ColorTransformOp.__init__( self, "applies gamma" )

		self.gamma = gamma

	def begin( self, operands ) :

		pass

	def transform( self, color ) :

		return Color3f(
			math.pow( color.r, 1.0 / self.gamma ),
			math.pow( color.g, 1.0 / self.gamma ),
			math.pow( color.b, 1.0 / self.gamma )
		)

	def end( self ) :

		pass


class CubeColorLookupTest( unittest.TestCase ) :

	def testOpConstruction( self ) :

		gammaOp = GammaOp( 2.0 )

		dim = V3i( 48, 66, 101 )
		cubeLookup = CubeColorLookupf( dim, gammaOp )

		random.seed( 23 )

		# Perform 100 random comparisons with the LUT against the original function
		for i in range( 0, 100 ) :

			c = Color3f( random.random(), random.random(), random.random() )

			c1 = cubeLookup( c )
			c2 = gammaOp.transform( c )

			self.assertAlmostEqual( c1.r, c2.r, 1 )
			self.assertAlmostEqual( c1.g, c2.g, 1 )
			self.assertAlmostEqual( c1.b, c2.b, 1 )



if __name__ == "__main__":
	unittest.main()

