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// ----------------------------------------------------------------------------
// Copyright (c) 2014, Nicolas P. Rougier. All Rights Reserved.
// Distributed under the (new) BSD License.
// ----------------------------------------------------------------------------
/*
* t <= 0 : return 0
* 0 < t < 1 : return t
* t >= 1 : return 0
*/
float
colormap_segment(float edge0, float edge1, float x)
{
return step(edge0,x) * (1.0-step(edge1,x));
}
/*
* t <= 0 : return under
* 0 < t < 1 : return color
* t >= 1 : return over
*/
vec3
colormap_underover(float t, vec3 color, vec3 under, vec3 over)
{
return step(t,0.0)*under +
colormap_segment(0.0,1.0,t)*color +
step(1.0,t)*over;
}
/*
* t <= 0 : return under
* 0 < t < 1 : return color
* t >= 1 : return over
*/
vec4
colormap_underover(float t, vec4 color, vec4 under, vec4 over)
{
return step(t,0.0)*under +
colormap_segment(0.0,1.0,t)*color +
step(1.0,t)*over;
}
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