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// version 120 is needed for gl_PointCoord
#version 120
uniform vec4 uniform_color;
uniform float percent_outline_radius;
uniform float percent_center_radius;
vec4 calc_color(float radius, vec4 color)
{
return ((radius < percent_center_radius) || (radius > 1.0 - percent_outline_radius)) ?
vec4(0.5 * color.rgb, color.a) : color;
}
void main()
{
vec2 pos = (gl_PointCoord - 0.5) * 2.0;
float radius = length(pos);
if (radius > 1.0)
discard;
gl_FragColor = calc_color(radius, uniform_color);
}
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