export module ra3.wasmgl;

import std;

export import ra3.core;
import ra3.render;
import ra3.client;

/**
 * Fallback wasm-worker WebGL backend for builds without Emscripten. `init` fails
 * so the caller can select another display; the class name matches the real
 * `ra3.wasmgl` module so the backend factory in `ra3.display` compiles
 * unchanged.
 */
export namespace ra3::wasmgl {
    /** No-op off Emscripten (there is no Emscripten virtual filesystem). */
    inline auto mount_assets(const std::string & = "/assets.manifest.json", const std::string & = "/assets",
                             const std::string & = "assets/") -> int {
        return 0;
    }

    class wasmgl_display final : public ra3::client::display {
    public:
        [[nodiscard]] auto init(const ra3::client::display_options &) -> bool override { return false; }
        [[nodiscard]] auto present(const ra3::render::image &, const ra3::render::view_rect &, bool) -> bool override { return false; }
        [[nodiscard]] auto poll_event(ra3::render::ui_event &) -> bool override { return false; }
        [[nodiscard]] auto window_size() const -> std::pair<int, int> override { return {0, 0}; }
        [[nodiscard]] auto key_down(ra3::render::ui_key) const -> bool override { return false; }
        auto shutdown() -> void override {}
        [[nodiscard]] auto name() const -> std::string_view override { return "wasmgl(null)"; }
    };
}