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gpu_shader_material_invert.glsl « material « shaders « gpu « blender « source - git.blender.org/blender.git - Unnamed repository; edit this file 'description' to name the repository.
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void invert(float fac, vec4 col, out vec4 outcol)
{
  outcol.xyz = mix(col.xyz, vec3(1.0) - col.xyz, fac);
  outcol.w = col.w;
}