c_gsk_gl_shader_node_new

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GskRenderNode* function(GskGLShader* shader, graphene_rect_t* bounds, GBytes* args, GskRenderNode** children, uint nChildren) c_gsk_gl_shader_node_new;

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