resolve_shader_path()

std::optional< std::filesystem::path > MayaFlux::Portal::Graphics::ShaderFoundry::resolve_shader_path ( const std::string &  filepath ) const

private

Definition at line 466 of file ShaderFoundry.cpp.

{
    namespace fs = std::filesystem;
 
    fs::path path(filepath);
    std::error_code ec;
 
    if (path.is_absolute() || fs::exists(path, ec)) {
        return path;
    }
 
    std::vector<std::string> user_paths;
 
#ifdef MAYAFLUX_PROJECT_SHADER_DIR
    user_paths.emplace_back(MAYAFLUX_PROJECT_SHADER_DIR);
#endif
 
    user_paths.insert(user_paths.end(),
        { "./shaders", "./data/shaders", "../shaders", "../data/shaders", "data/shaders" });
 
    if (std::string_view(Config::SHADER_EXAMPLE_DIR).length() > 0) {
        user_paths.emplace_back(Config::SHADER_EXAMPLE_DIR);
    }
 
    const std::vector<std::string> library_paths = {
        Config::SHADER_BUILD_OUTPUT_DIR,
        Config::SHADER_INSTALL_DIR,
        Config::SHADER_SOURCE_DIR
    };
 
    for (const auto& search_path : user_paths) {
        fs::path full_path = fs::path(search_path) / filepath;
        if (!fs::exists(full_path, ec)) {
            continue;
        }
 
        for (const auto& library_path : library_paths) {
            fs::path shadowed = fs::path(library_path) / filepath;
            if (fs::exists(shadowed, ec) && !fs::equivalent(full_path, shadowed, ec)) {
                MF_WARN(Journal::Component::Portal, Journal::Context::ShaderCompilation,
                    "Shader '{}' at '{}' shadows library shader '{}'",
                    filepath, full_path.string(), shadowed.string());
                break;
            }
        }
        return full_path;
    }
 
    for (const auto& search_path : library_paths) {
        fs::path full_path = fs::path(search_path) / filepath;
        if (fs::exists(full_path, ec)) {
            return full_path;
        }
    }
 
    return std::nullopt;
}

References length, MF_WARN, MayaFlux::Journal::Portal, and MayaFlux::Journal::ShaderCompilation.

Referenced by detect_source_type().

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