shader_mngr.hpp

// By Emil Ernerfeldt 2014-2016
// LICENSE:
//   This software is dual-licensed to the public domain and under the following
//   license: you are granted a perpetual, irrevocable license to copy, modify,
//   publish, and distribute this file as you see fit.
// HISTORY:
//   Created in 2014 for Ghostel
//   Moved into emilib in 2016

#pragma once

#include <memory>
#include <string>
#include <unordered_map>

#include <emilib/gl_lib_fwd.hpp>

namespace emilib {

class DelayedDirWatcher;
using DelayedDirWatcher_UP = std::unique_ptr<DelayedDirWatcher>;

gl::ProgramSource load_shader_file(const std::string& shader_dir, const std::string& name);

class ShaderMngr
{
public:
    explicit ShaderMngr(const std::string& shader_dir);
    ~ShaderMngr();

    void update();

    // gl::Program* get(const gl::ProgramSource& program_source);

    // gl::Program* get_source(const std::string& name, const std::string& vs, const std::string& fs) const;

    gl::Program* get_ff(int flags);

    gl::Program* get_file(const std::string& name);

    void reload_all();

private:
    // using SourceMap = std::unordered_map<gl::ProgramSource, gl::Program_UP>;
    using FFMap     = std::unordered_map<int,               gl::Program_UP>;
    using FileMap   = std::unordered_map<std::string,       gl::Program_UP>;

    std::string          _shader_dir;
    DelayedDirWatcher_UP _dir_watcher;
    // SourceMap            _source_map;
    FFMap                _ff_map;
    FileMap              _file_map;
};

} // namespace emilib