fallback_input.hpp

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#ifndef OGLPLUS_TEXGEN_FALLBACK_INPUT_HPP
#define OGLPLUS_TEXGEN_FALLBACK_INPUT_HPP
 
#include "base_input.hpp"
#include "const_output.hpp"
 
namespace eagine::oglp::texgen {
 
template <typename FallbackOutput>
class fallback_input : public base_input {
private:
    FallbackOutput _fallback;
 
public:
    fallback_input(node_intf& parent, string_view name)
      : base_input(parent, name)
      , _fallback(parent) {}
 
    template <typename... P>
    fallback_input(node_intf& parent, string_view name, P&&... p)
      : base_input(parent, name)
      , _fallback(parent, std::forward<P>(p)...) {}
 
    FallbackOutput& fallback() noexcept {
        return _fallback;
    }
 
    bool accepts_value_type(slot_data_type) override {
        return true;
    }
 
    output_intf& output() {
        if(is_connected()) {
            return connected_output();
        } else {
            return fallback();
        }
    }
 
    bool
    set_default_value(valid_if_between<span_size_t, 0, 3> c, float v) override {
        return fallback().set_default_value(c.value(), v);
    }
 
    slot_data_type value_type() {
        return output().value_type();
    }
 
    std::ostream&
    definitions(std::ostream& out, compile_context& ctxt) override {
        return output().definitions(out, ctxt);
    }
 
    std::ostream& expression(std::ostream& out, compile_context& ctxt) override {
        return output().expression(out, ctxt);
    }
};
 
template <typename T>
using input_with_const_default = fallback_input<constant_output<T>>;
 
} // namespace eagine::oglp::texgen
 
#endif // OGLPLUS_TEXGEN_FALLBACK_INPUT_HPP