source/blender/gpu/shaders/gpu_shader_gpencil_stroke_frag.glsl


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in vec4 mColor;
in vec2 mTexCoord;

out vec4 fragColor;

void main()
{
  const vec2 center = vec2(0, 0.5);
  vec4 tColor = vec4(mColor);
  /* if alpha < 0, then encap */
  if (mColor.a < 0) {
    tColor.a = tColor.a * -1.0;
    float dist = length(mTexCoord - center);
    if (dist > 0.25) {
      discard;
    }
  }
  /* Solid */
  fragColor = tColor;
}