flat in vec2 startPos;
in vec2 vertPos;

out vec4 fragColor;

uniform vec4 color;
uniform float dashSize;
uniform float gapSize;

void main()
{
    vec2  dir  = (vertPos.xy - startPos.xy);
    float dist = length(dir);

    if (fract(dist / (dashSize + gapSize)) > dashSize/(dashSize + gapSize))
        discard; 
    fragColor = color;
}