dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_frag_xvary.frag


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/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/


#ifdef GL_ES
precision mediump float;
#endif
varying vec4 color;

void main (void)
{
	const float M_PI = 3.14159265358979323846;
	float c = 4.0 * 2.0 * (color.r - 0.5);
	gl_FragColor = vec4(atan(c) / M_PI + 0.5, 0.0, 0.0, 1.0);
}