blender-archive/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl

#pragma BLENDER_REQUIRE(gpu_shader_colorspace_lib.glsl)

void main()
{
#ifdef CLIP
  if (interp.clip < 0.0) {
    discard;
  }
#endif
  fragColor = interp.color;
  if (lineSmooth) {
    fragColor.a *= clamp((lineWidth + SMOOTH_WIDTH) * 0.5 - abs(interp.smoothline), 0.0, 1.0);
  }
  fragColor = blender_srgb_to_framebuffer_space(fragColor);
}