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// ----------------------------------------------------------------------------
// Copyright (c) 2014, Nicolas P. Rougier. All Rights Reserved.
// Distributed under the (new) BSD License.
// ----------------------------------------------------------------------------
#include "antialias/stroke.glsl"
/* ---------------------------------------------------------
Compute antialiased fragment color for a line cap.
Type: butt
Parameters:
-----------
dx,dy : signed distances to cap point (in pixels)
linewidth: Stroke line width (in pixels)
antialias: Stroke antialiased area (in pixels)
stroke: Stroke color
Return:
-------
Fragment color (vec4)
--------------------------------------------------------- */
vec4 cap_butt(float dx, float dy, float linewidth, float antialias, vec4 color)
{
float t = linewidth/2.0 - antialias;
float d = max(abs(dx)+t, abs(dy));
return stroke(d, linewidth, antialias, color);
}
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