source/blender/gpu/shaders/gpu_shader_2D_widget_shadow_frag.glsl


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#ifndef USE_GPU_SHADER_CREATE_INFO
in float shadowFalloff;

out vec4 fragColor;

uniform float alpha;
#endif

void main()
{
  fragColor = vec4(0.0);
  /* Manual curve fit of the falloff curve of previous drawing method. */
  fragColor.a = alpha * (shadowFalloff * shadowFalloff * 0.722 + shadowFalloff * 0.277);
}