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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 vec3 edge0 = vec3(0.25, 0.25, 0.25);
const vec3 edge1 = vec3(0.75, 0.75, 0.75);
vec3 c = clamp((color.rgb - edge0) / (edge1 - edge0), 0.0, 1.0);
gl_FragColor = vec4(c * c * (3.0 - 2.0 * c), 1.0);
}
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