dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/acos/acos_vec3_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;
	vec3 c = 2.0 * (color.rgb - 0.5);
	gl_FragColor = vec4(acos(c) / M_PI, 1.0);
}