Loose collection of misc C++ libs
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README.md

emilib

This is a loose collection of C++14 libraries I tend to reuse between different (mostly game-related) projects.

They are meant mostly for me (Emil Ernerfeldt), but if you find them useful, have at it.

Their only dependencies are either system dependencies (pthread etc) and Loguru. gl_lib also depends on OpenGL and GLEW. The libraries does not depend on each other (with an exception for ShaderMngr).

They all work on OSX and iOS and probably Linux. Some may work elsewhere.

License

This software is in the public domain. Where that dedication is not recognized, you are granted a perpetual, irrevocable license to copy and modify this file as you see fit.

Documentation

Documentation can be found at https://emilk.github.io/emilib/html/index.html.

Usage

Most libraries in emilib are stand-alone, so you can, for instance, use the coroutine library without having to compile anything but that.

Some are header-only, but most come with a .cpp file too.

To use a single library, just #include the header, and if there is a .cpp (or .mm in case of iOS/OSX) either compile and link that, or just include that too, e.g.:

#include <emilib/coroutine.hpp>
#include <emilib/coroutine.cpp> // Do this only in one of your .cpp files

You can also make use of unity_build.cpp to compile all of emilib all at once. To use the iOS/OSX specific libraries, use unity_build.mm instead.

You also need to compile Loguru. Luckily, loguru.hpp is included in this repo, and to compile it you just need to add the following to one of your .cpp files:

#define LOGURU_IMPLEMENTATION
#include <loguru.hpp>

Make sure you compile with -std=c++11 -lpthread -ldl

Documentation

This file (README.md) contains an overview of each library. Read the header for each library to learn more.

Examples

There is a very limited set of examples in the examples/ folder.

Tests

There is a very limited set of tests in the tests/ folder.

Stand-alone libraries

algorithm.hpp

Useful extensions to STL

coroutine.hpp/.cpp

This is a "fake coroutine" class which implements a cooperative thread and methods for passing execution between the outer and inner thread.

This is really nice for handling things that you would normally use a state machine for. Perfect for games where you might want to have a scripted event, a dialogue or something else running in its own thread, but not at the same time as the main game logic thread.

dir_watcher.hpp/.cpp

This library allows you to watch for changes in a directory, e.g. new files, deleted files or changes in existing files. This is great for doing automatic hot-reloading of things like textures, shaders, etc.

POSIX systems only.

dual.hpp

Library for dual numbers. Can be used for numerical stable differentiation. Works inside of Eigen.

filesystem.hpp/.cpp

Contains functions for easily reading/writing files, getting file size and modified time, listing all files in a directory, etc.

It also contains functions for working with file paths.

hash_cache.hpp

HashCache wraps a value and memoizes the hash of that value. Can speed up hash sets and maps by a lot.

hash_map.hpp / hash_set.hpp

Cache-friendly hash map/set with open addressing, linear probing and power-of-two capacity. Acts mostly like std::unordered_map/std::unordered_set except for:

  • Much better performance
  • Key/values may move when rehashing

irange.hpp

Simple integer range, allowing you to replace for (size_t i = 0; i < limit; ++i) with for (auto i : irange(limit)). It also provides a Range class which represent an integer range in a half-closed interval [begin, end) as well as the following functions:

	for (const auto ix : irange(end))                        { CHECK_F(0     <= ix && ix < end);           }
	for (const auto ix : irange(begin, end))                 { CHECK_F(begin <= ix && ix < end);           }
	for (const auto ix : indices(some_vector))               { CHECK_F(0 <= ix && ix < some_vector.size(); }
	for (const char ch : emilib::cstr_range("hello world!")) { ...                                         }
	for (auto& value : it_range(begin, end))                 { std::cout << value;                         }

list_map.hpp / list_set.hpp

Simple O(N) map/set with small overhead and great performance for small N.

magica_voxel.hpp/.cpp

Loader for MagicaVoxel models.

marching_squares.hpp/.cpp

Short, simple marching squares implementation.

mem_map.hpp/.cpp

Simple wrapper around memory mapping with RAII.

movement_tracker.hpp/.cpp

Track movement of some data, e.g. to estimate velocity from recent movement. For instance, you can use this to track a finger flicking something on a touch-screen to calculate the final velocity when the finger is released.

read_write_mutex.hpp

Fast mutex for multiple-readers, single-writer scenarios written in pure C++11.

scope_exit.hpp

Adds the macro SCOPE_EXIT for running some code at the end of the scope (or when a function returns, etc). Example:

void foo()
{
    File* file = fopen(...);
    SCOPE_EXIT{ fclose(file); };
    if (bar) { return; }
    if (baz) { exit(); }
    might_throw_an_exception(file);
}

string_interning.hpp/.cpp

Stupid simple thread-safe string interning.

strprintf.hpp/.cpp

Minimalistic string formating library. Provides two functions: strprintf and vstrprintf that act like printf and vprintf respectively, but return the formated text as a std::string instead of printing it.

tga.hpp/.cpp

Dump a tga image to disk.

thread_pool.hpp/.cpp

A simple thread pool.

timer.hpp/.cpp

Monotonic wall time chronometer.

tuple_util.hpp

Adds for_each_tuple for iterating over a std::tuple and also overloads std::hash for std::tuple.

utf8.hpp/.cpp

Really basic utf8 operations.

wav.hpp/.cpp

Parse WAVE (.wav) sound files.

word_wrap.hpp/.cpp

Wrap lines of text to fit within a given width.

iOS / OSX specific libraries:

music.hpp/.mm

Stream mp3 music on OSX and iOS.

os.hpp/.mm

Device information like screen size and orientation.

pvr.hpp/.mm

Loading of compressed .pvr textures. Depends on gl_lib.

text_paint.hpp/.mm

Pretty multi-line Unicode text rendering for OSX and iOS. It lets you select font, size, alignment, wrapping size and allows you to colorize and italicize sub-ranges of the text.

It draws the text to memory, so it is up to you to display it (e.g. upload it to a texture).

Libraries with third-party dependencies

al_lib

Code for loading, playing and positioning sounds using OpenAL.

Depends on OpenAL and other parts of emilib.

Include al_lib.hpp and link with al_lib.cpp. You can also make use of al_lib_fwd.hpp to bring in forward declarations for most things in al_lib.

gl_lib

Code for doing simple things in OpenGL and/or OpenGL ES (GLES). It has classes and methods for dealing with:

  • 2D Textures
  • Vertex and fragment shaders
    • You can use the same shader code for GLES and non-GLES targets
  • Vertex buffers (VBO/VAO)
  • Viewports
  • Off-screen buffers (FBO)

Depends on OpenGL and GLEW.

Include gl_lib.hpp and link with gl_lib.cpp. You can also make use of gl_lib_fwd.hpp to bring in forward declarations for most things in gl_lib. To do OpenGL calls you can include gl_lib_opengl.hpp (which just includes the correct OpenGL and/or glew headers for you system).

gl_lib_sdl.hpp/.cpp

Helper functions for creating an SDL2 OpenGL window.

imgui_gl_lib.hpp/.cpp

Provides bindings between my gl_lib and the wonderful Dear ImGui GUI library. Can be used alone or together with emilib/imgui_sdl.hpp/.cpp.

imgui_gl_lib_tools.hpp/.cpp

Some additional helpers for painting OpenGL stuff with gl_lib inside of Dear ImGui.

imgui_helpers.hpp/.cpp

Helpers for working with the wonderful Dear ImGui GUI library.

imgui_sdl.hpp/.cpp

Bindings between SDL2 and the wonderful Dear ImGui GUI library. Can be used alone or together with emilib/imgui_gl_lib.hpp/.cpp.

sdl_input.hpp/.cpp

sdl_input wraps the input events from SDL2 with an easy-to-use interface that is unified for desktop and mobile.

shader_mngr.hpp/.cpp

This is NOT a stand-alone library, but depends on other parts of emilib as well as loguru and configuru. ShaderMngr's job is to encapsulate loading, memoization and reloading of shader files. In particular, ShaderMngr can detect changes in .shader files and automatically reload (hot-reloading) them.

texture_mngr.hpp/.cpp

This is NOT a stand-alone library, but depends on other parts of emilib as well as loguru. TextureMngr's job is to encapsulate loading, memoization and reloading of texture files. In particular, TextureMngr can detect changes in image files and automatically reload (hot-reloading) them.

Libraries not part of emilib, but incldued for convenicence:

configuru.hpp

This is not part of emilib, but a copy of https://github.com/emilk/configuru here only for convenience.

loguru.hpp

This is not part of emilib, but a copy of https://github.com/emilk/loguru here for convenience, and as a dependency for most other libraries.