Topic: "graphics-engine"
mosra/magnum
Lightweight and modular C++11 graphics middleware for games and data visualization
Language: C++ - Size: 61.2 MB - Last synced at: 7 days ago - Pushed at: 7 days ago - Stars: 4,952 - Forks: 451
DiligentGraphics/DiligentEngine
A modern cross-platform low-level graphics library and rendering framework
Language: Batchfile - Size: 9.62 MB - Last synced at: about 1 hour ago - Pushed at: 2 days ago - Stars: 3,854 - Forks: 349
Overload-Technologies/Overload
3D game engine with lua scripting
Language: C++ - Size: 37.4 MB - Last synced at: 4 days ago - Pushed at: 4 days ago - Stars: 2,189 - Forks: 265
fdivitto/FabGL
ESP32 Display Controller (VGA, PAL/NTSC Color Composite, SSD1306, ST7789, ILI9341), PS/2 Mouse and Keyboard Controller, Graphics Library, Sound Engine, Game Engine and ANSI/VT Terminal
Language: C++ - Size: 88.8 MB - Last synced at: 13 days ago - Pushed at: 2 months ago - Stars: 1,552 - Forks: 229
AngelMonica126/GraphicAlgorithm
:octopus: :octopus:图形学论文实现
Language: C++ - Size: 806 MB - Last synced at: 14 days ago - Pushed at: about 3 years ago - Stars: 1,486 - Forks: 242
lume/lume
GPU-powered 3D HTML. ✨🧊 <lume-box size="1 2 3">
Language: TypeScript - Size: 128 MB - Last synced at: 7 days ago - Pushed at: 2 months ago - Stars: 1,415 - Forks: 62
CasparCG/server
CasparCG Server is a Windows and Linux software used to play out professional graphics, audio and video to multiple outputs. It has been in 24/7 broadcast production since 2006. Ready-to-use downloads are available under the Releases tab https://casparcg.com.
Language: C++ - Size: 252 MB - Last synced at: 5 days ago - Pushed at: 5 days ago - Stars: 950 - Forks: 277
PardCode/CPP-3D-Game-Tutorial-Series
C++ 3D Game Tutorial Series (DirectX) - Learn to code a DirectX 3D Game in C++ from scratch
Language: C++ - Size: 35.4 MB - Last synced at: 21 days ago - Pushed at: 21 days ago - Stars: 920 - Forks: 128
MethanePowered/MethaneKit
🎲 Modern 3D graphics made simple with C++20 cross-platform framework and rendering abstraction API on top of DirectX 12, Vulkan & Metal
Language: C++ - Size: 53.2 MB - Last synced at: 5 days ago - Pushed at: 5 days ago - Stars: 913 - Forks: 59
polymonster/pmtech
Lightweight, multi-platform, data-oriented game engine.
Language: C++ - Size: 389 MB - Last synced at: 4 days ago - Pushed at: about 1 year ago - Stars: 899 - Forks: 51
liblava/liblava
Modern and easy-to-use library for Vulkan
Language: C++ - Size: 10.1 MB - Last synced at: 8 months ago - Pushed at: 8 months ago - Stars: 778 - Forks: 46
KTStephano/StratusGFX
Realtime 3D rendering engine
Language: C++ - Size: 314 MB - Last synced at: about 1 month ago - Pushed at: 3 months ago - Stars: 731 - Forks: 40
malhotra5/Manim-Tutorial
A tutorial for manim, a mathematical animation engine made by 3b1b
Language: Python - Size: 1.5 MB - Last synced at: 5 days ago - Pushed at: 7 months ago - Stars: 728 - Forks: 91
RavEngine/RavEngine
A fast C++23 3D game engine for modern devices, with wide platform support
Language: C++ - Size: 775 MB - Last synced at: 5 days ago - Pushed at: 5 days ago - Stars: 726 - Forks: 49
DiligentGraphics/DiligentCore
A modern cross-platform low-level graphics API
Language: C++ - Size: 45.8 MB - Last synced at: 6 days ago - Pushed at: 6 days ago - Stars: 665 - Forks: 150
simple2d/simple2d
:video_game: Simple, open-source 2D graphics for everyone
Language: C - Size: 544 KB - Last synced at: about 2 months ago - Pushed at: 3 months ago - Stars: 621 - Forks: 70
kosua20/Rendu
A simple realtime graphics playground for experimentations.
Language: C++ - Size: 40.4 MB - Last synced at: 4 days ago - Pushed at: 8 months ago - Stars: 559 - Forks: 33
jpvanoosten/LearningDirectX12
This repository is intended to be used as a code repository for learning DirectX 12.
Language: C++ - Size: 312 MB - Last synced at: 11 months ago - Pushed at: about 1 year ago - Stars: 553 - Forks: 80
Devsh-Graphics-Programming/Nabla
Vulkan, OptiX and CUDA Interoperation Modular Rendering Library and Framework for PC/Linux/Android
Language: C++ - Size: 1.85 GB - Last synced at: 7 days ago - Pushed at: 7 days ago - Stars: 548 - Forks: 64
Ershany/Arcane-Engine
3D C/C++ Game Engine - Created By Brady Jessup
Language: C++ - Size: 1.05 GB - Last synced at: 4 days ago - Pushed at: 12 days ago - Stars: 519 - Forks: 37
ray-cast/AnimatorGo
🤸🏾♀️👗提倡以简单、易用，高质量的物理演算以及渲染质量和性能，为喜爱二次元动画的用户降低视频制作门槛
Language: C++ - Size: 104 MB - Last synced at: 1 day ago - Pushed at: 11 months ago - Stars: 495 - Forks: 65
mateeeeeee/Adria
Rendergraph-based DirectX12 graphics engine
Language: C++ - Size: 1.08 GB - Last synced at: 13 days ago - Pushed at: 18 days ago - Stars: 480 - Forks: 42
jslee02/awesome-graphics-libraries
:sunglasses: A curated list of 3D graphics libraries and resources
Size: 60.5 KB - Last synced at: 4 days ago - Pushed at: 8 months ago - Stars: 471 - Forks: 36
hotstreams/limitless-engine
OpenGL C++ Graphics Engine
Language: C++ - Size: 917 MB - Last synced at: 21 days ago - Pushed at: 21 days ago - Stars: 439 - Forks: 32
andrejnau/FlyCube
Graphics API wrapper is written in C++ on top of DirectX 12, Vulkan and Metal. Provides main features including ray tracing.
Language: C++ - Size: 843 MB - Last synced at: 4 days ago - Pushed at: 24 days ago - Stars: 411 - Forks: 21
DiligentGraphics/DiligentSamples
Sample projects demonstrating the usage of Diligent Engine
Language: C++ - Size: 302 MB - Last synced at: 15 days ago - Pushed at: 15 days ago - Stars: 363 - Forks: 88
wojciech-graj/TermGL
2D & 3D graphics engine in the terminal [C/C++]
Language: C - Size: 13.8 MB - Last synced at: 29 days ago - Pushed at: 6 months ago - Stars: 328 - Forks: 9
ensisoft/detonator
2D game engine and editor 💥💣
Language: C++ - Size: 499 MB - Last synced at: 30 days ago - Pushed at: 30 days ago - Stars: 327 - Forks: 14
favreau/Sol-R Fork of cyrillefavreau/Sol-R
Open-Source CUDA/OpenCL Speed Of Light Ray-tracer
Language: C++ - Size: 22 MB - Last synced at: 12 days ago - Pushed at: 11 months ago - Stars: 306 - Forks: 12
mosra/magnum-examples
Examples for the Magnum C++11 graphics engine
Language: C++ - Size: 14.4 MB - Last synced at: 8 days ago - Pushed at: 8 days ago - Stars: 297 - Forks: 95
ABRG-Models/morphologica
C++ header-only graphing and data visualization with Modern OpenGL
Language: C++ - Size: 77.7 MB - Last synced at: 5 days ago - Pushed at: 6 days ago - Stars: 293 - Forks: 35
qiutang98/flower
Miku fan-made free MikuMikuDacne renderer
Language: C - Size: 436 MB - Last synced at: 3 months ago - Pushed at: 3 months ago - Stars: 269 - Forks: 28
glscene/GLXEngine
GLXEngine - a graphics engine collector with GLScene & GXScene component packages for Delphi & C++Builder. The class libraries for creating 3D scenes with rendering and animations of spatial objects include managers for supporting physics, sounds, terrains with materials and shaders
Language: Pascal - Size: 313 MB - Last synced at: 4 days ago - Pushed at: 4 days ago - Stars: 225 - Forks: 36
PardCode/OpenGL-3D-Game-Tutorial-Series
C++ OpenGL 3D Game Tutorial Series - Learn to code a Cross-Platform OpenGL 3D Game in C++ from scratch
Language: C++ - Size: 786 KB - Last synced at: about 1 month ago - Pushed at: about 1 year ago - Stars: 220 - Forks: 35
morganbengtsson/mos
Lightweight game engine.
Language: C++ - Size: 18 MB - Last synced at: about 2 months ago - Pushed at: 2 months ago - Stars: 219 - Forks: 15
LuminoEngine/Lumino
Lumino is a framework for building real-time graphics applications.
Language: C++ - Size: 120 MB - Last synced at: 18 days ago - Pushed at: 18 days ago - Stars: 213 - Forks: 15
Wassimulator/CactusViewer
A small single file image viewer written in C/C++.
Language: C++ - Size: 131 MB - Last synced at: 4 months ago - Pushed at: 4 months ago - Stars: 206 - Forks: 15
Trinkle23897/Computational-Graphics-THU-2018
Computational Graphics - THU Spring 2018
Language: C - Size: 102 MB - Last synced at: 21 days ago - Pushed at: over 5 years ago - Stars: 198 - Forks: 42
MorcilloSanz/RendererGL
Cross platform 3D renderer in C++ and OpenGL with lighting, shadows and materials.
Language: C++ - Size: 407 MB - Last synced at: 29 days ago - Pushed at: 29 days ago - Stars: 184 - Forks: 20
Try/Tempest
API abstraction layer for 3D graphics, UI and sound. Written in C++17 with Vulkan, DX12 and Metal support.
Language: C++ - Size: 19.4 MB - Last synced at: 6 days ago - Pushed at: 6 days ago - Stars: 161 - Forks: 31
meta4d-me/CatDogEngine
A cross-platform game engine/editor written in modern C++ (WIP)
Language: C++ - Size: 608 MB - Last synced at: about 1 year ago - Pushed at: about 1 year ago - Stars: 148 - Forks: 15
mateeeeeee/Adria-DX11
DirectX 11 graphics engine
Language: C++ - Size: 457 MB - Last synced at: 6 months ago - Pushed at: 6 months ago - Stars: 133 - Forks: 11
mosra/magnum-singles
Single-header libraries from the Magnum engine
Language: C++ - Size: 676 KB - Last synced at: about 1 month ago - Pushed at: 2 months ago - Stars: 117 - Forks: 12
WW92030-STORAGE/VSC
Portable 3D Real-Time Rendering Engine in C++
Language: C++ - Size: 3.97 MB - Last synced at: 12 days ago - Pushed at: 12 days ago - Stars: 113 - Forks: 3
dimi309/small3d
Tiny C++ 3D game development library for Win/MacOS/Linux/iOS/Android.
Language: C++ - Size: 79.5 MB - Last synced at: about 1 year ago - Pushed at: about 1 year ago - Stars: 113 - Forks: 4
mosra/magnum-integration
Integration libraries for the Magnum C++11 graphics engine
Language: C++ - Size: 2.18 MB - Last synced at: 7 days ago - Pushed at: 7 days ago - Stars: 103 - Forks: 46
mosra/magnum-plugins
Plugins for the Magnum C++11 graphics engine
Language: C++ - Size: 14 MB - Last synced at: 8 days ago - Pushed at: 8 days ago - Stars: 101 - Forks: 62
recp/gkern
🎥 Graphics Kernel: flexible, highly configurable, extensible render engine (realtime + offline)
Language: C - Size: 1.2 MB - Last synced at: about 1 month ago - Pushed at: almost 2 years ago - Stars: 101 - Forks: 11
mosra/magnum-bootstrap
Bootstrap projects for the Magnum C++11 graphics engine
Language: Shell - Size: 620 KB - Last synced at: 18 days ago - Pushed at: 18 days ago - Stars: 95 - Forks: 37
crud89/LiteFX
Modern, flexible computer graphics and rendering engine, written in C++23 with support for Vulkan 🌋 and DirectX 12 ❎.
Language: C++ - Size: 88.3 MB - Last synced at: about 1 month ago - Pushed at: about 1 month ago - Stars: 92 - Forks: 9
LMP88959/PL3D-KC
A very fast and simple software renderer using only integers and fixed point math. PiSHi LE (PL) is a subset of the 3D software graphics library used in King's Crook.
Language: C - Size: 191 KB - Last synced at: over 1 year ago - Pushed at: over 1 year ago - Stars: 92 - Forks: 7
LAGameStudio/apolune
Lost Astronaut's Game Creation Framework: A massive 1800+ class 1400 file extravaganza of OpenGL, WinAPI, OpenAL and many other features, written in Visual Studio for over a decade!
Language: C++ - Size: 56.4 MB - Last synced at: 6 months ago - Pushed at: 6 months ago - Stars: 91 - Forks: 6
bmchtech/rengfx
lightweight, expressive, extensible multimedia engine
Language: D - Size: 15.7 MB - Last synced at: 6 months ago - Pushed at: 7 months ago - Stars: 81 - Forks: 5
janhsimon/makma
Makma is a deferred Vulkan renderer written in C++.
Language: C++ - Size: 472 MB - Last synced at: over 1 year ago - Pushed at: about 4 years ago - Stars: 81 - Forks: 4
Hykudoru/Pescado-Engine-Embedded-ESP32S3
A 3D Graphics Engine for the ESP32.
Language: C - Size: 16 MB - Last synced at: 11 months ago - Pushed at: 11 months ago - Stars: 79 - Forks: 3
metaleap/go-ngine 📦
[2013, incomplete] the goal back then: "a Go-native, modern-OpenGL real-time 3D rendering engine" ➜ I think it's still a solid *basis* for one; the real "meat" is in `___old2013` ➜ project stalled out as my focus shifted elsewhere from 2014
Language: Go - Size: 10.9 MB - Last synced at: 11 months ago - Pushed at: about 8 years ago - Stars: 77 - Forks: 7
galacean/galacean.github.io 📦
Source code of website, documentation and examples included.
Language: TypeScript - Size: 102 MB - Last synced at: about 16 hours ago - Pushed at: 9 months ago - Stars: 76 - Forks: 47
fabsgc/TweedeEngine
The Tweede Engine Framework is my third attempt to develop a cross-platform full game engine and game framework. It aims to provide one day a complete foundation for the development of real time graphical applications such as games
Language: C++ - Size: 1.19 GB - Last synced at: 2 months ago - Pushed at: 2 months ago - Stars: 69 - Forks: 9
iseahound/TextRender
Simple and minimalistic graphics engine for displaying text on screen. Supports AutoHotkey v1 and v2.
Language: AutoHotkey - Size: 970 KB - Last synced at: 4 days ago - Pushed at: 4 days ago - Stars: 62 - Forks: 12
kbladin/ElkEngine
Simple graphics engine used as submodule in many of my projects
Language: C++ - Size: 7.91 MB - Last synced at: about 1 month ago - Pushed at: about 6 years ago - Stars: 62 - Forks: 11
arminkz/ShaderToy.NET
Native shadertoy-compatible GLSL playground in .NET framework Environment
Language: C# - Size: 7.85 MB - Last synced at: about 1 year ago - Pushed at: almost 7 years ago - Stars: 61 - Forks: 15
SkillerRaptor/hyper_engine
Hyper Vulkan Game Engine
Language: C++ - Size: 81.4 MB - Last synced at: 6 days ago - Pushed at: 6 days ago - Stars: 58 - Forks: 3
mamontov-cpp/saddy-graphics-engine-2d
Saddy is an open-source crossplatform 2D graphic engine, based on OpenGL, which can be used for creating 2D games. like platformers or RPGs.
Language: C++ - Size: 76.5 MB - Last synced at: 4 days ago - Pushed at: about 1 month ago - Stars: 57 - Forks: 19
arielm/chronotext-cross
Cross platform infrastructure for developing 2d and 3d applications with C++ and OpenGL
Language: C++ - Size: 28.6 MB - Last synced at: 12 months ago - Pushed at: 12 months ago - Stars: 56 - Forks: 12
lschmid83/Dragon-Island
This is a 2D platform game similiar to Super Mario World written in Java and C++ with a level editor. Available for PC, Android, GP2X and PSP platforms.
Language: Java - Size: 80.9 MB - Last synced at: about 1 month ago - Pushed at: 10 months ago - Stars: 55 - Forks: 2
ActuarialIntelligence/Base
https://www.researchgate.net/profile/Rajah_Iyer
Language: C# - Size: 49 MB - Last synced at: 9 months ago - Pushed at: 9 months ago - Stars: 51 - Forks: 4
SurgeTechnologies/Electro
A rendering engine, what else?
Language: C++ - Size: 65.3 MB - Last synced at: over 1 year ago - Pushed at: over 3 years ago - Stars: 49 - Forks: 4
roshanpoudyal/3D_interactive_graphics_rendering_engine
Develop a 3D interactive graphics rendering engine
Language: C - Size: 134 KB - Last synced at: 10 months ago - Pushed at: 10 months ago - Stars: 48 - Forks: 7
CWBudde/Pascal-HTML5-Canvas
Pascal implementation of a HTML 5 Canvas
Language: Pascal - Size: 40 KB - Last synced at: 3 months ago - Pushed at: about 6 years ago - Stars: 48 - Forks: 15
Hykudoru/Pescado-3D-Engine
A 3D graphics and physics engine coded from scratch in C++ and OpenGL.
Language: C++ - Size: 800 MB - Last synced at: 8 months ago - Pushed at: 8 months ago - Stars: 47 - Forks: 1
iftodebogdan/GITechDemo
Global illumination technical demo - a continuation of the Synesthesia3D (ex-LibRenderer) graphics engine used in https://github.com/iftodebogdan/ShaderEditor
Language: C++ - Size: 745 MB - Last synced at: about 2 years ago - Pushed at: over 3 years ago - Stars: 46 - Forks: 4
mmick66/kinieta
A Fast Animation Engine with an Intuitive API
Language: Swift - Size: 1.1 MB - Last synced at: 1 day ago - Pushed at: over 7 years ago - Stars: 46 - Forks: 5
quyse/flaw
FLAW is an experimental game engine in Haskell
Language: C++ - Size: 26.3 MB - Last synced at: 4 months ago - Pushed at: 4 months ago - Stars: 45 - Forks: 0
sunli829/nvg
Pure-rust implementation of NanoVG
Language: Rust - Size: 977 KB - Last synced at: 27 days ago - Pushed at: over 4 years ago - Stars: 42 - Forks: 9
ssteinberg/ste
3D graphics engine
Language: C++ - Size: 1.76 GB - Last synced at: about 2 years ago - Pushed at: almost 3 years ago - Stars: 41 - Forks: 5
Hasan-Jawaheri/Wasabi
Wasabi Vulkan Game Engine
Language: C++ - Size: 7.02 MB - Last synced at: over 1 year ago - Pushed at: over 3 years ago - Stars: 37 - Forks: 8
lingtorp/MeineKraft
Rendering engine written in C++ & OpenGL.
Language: C++ - Size: 116 MB - Last synced at: 6 days ago - Pushed at: over 4 years ago - Stars: 37 - Forks: 3
MrSinho/shvulkan
A lightweight and flexible wrapper around the Vulkan API written in C. The library handles part of the boilerplate code expected to be set up by the Vulkan API.
Language: C - Size: 1.1 MB - Last synced at: 3 months ago - Pushed at: 3 months ago - Stars: 36 - Forks: 1
CloudCodingSpace/CENGINE
A graphics engine in C with the Vulkan API for experience
Language: C - Size: 2.39 MB - Last synced at: 4 days ago - Pushed at: 3 months ago - Stars: 36 - Forks: 4
RonenNess/ness-engine
NessEngine is a 2D rendering engine for games
Language: C - Size: 479 MB - Last synced at: 15 days ago - Pushed at: almost 10 years ago - Stars: 34 - Forks: 5
NaitikSanas/MicroCanvas
MicroCanvas is a 2D Graphics Engine built for ESP32 to make portable GUI, Video Games, Vector Graphics for any display. for now It's comes with ready to use support for displays based on SSD1306, ST7789 controllers. You can add support for any display in port layer. Contributions are always welcome :)
Language: C - Size: 13 MB - Last synced at: 13 days ago - Pushed at: 13 days ago - Stars: 33 - Forks: 4
RavEngine/Samples
RavEngine sample programs
Language: Mathematica - Size: 308 MB - Last synced at: 30 days ago - Pushed at: 30 days ago - Stars: 33 - Forks: 8
berkbavas/CanavarGraphicsEngine
A basic graphics engine written with C++ using OpenGL API
Language: C++ - Size: 166 MB - Last synced at: 20 days ago - Pushed at: 5 months ago - Stars: 33 - Forks: 6
deg3x/Ember
An OpenGL game engine with simple architecture and easy to understand codebase
Language: C++ - Size: 87.8 MB - Last synced at: 5 months ago - Pushed at: 5 months ago - Stars: 33 - Forks: 3
recp/gpu
🔭 cross platform general purpose GPU library - optimized for rendering
Language: C - Size: 1.82 MB - Last synced at: about 1 month ago - Pushed at: 8 months ago - Stars: 33 - Forks: 1
wick3dr0se/egor
A stupid simple cross-platform 2D graphics engine
Language: Rust - Size: 885 KB - Last synced at: 4 days ago - Pushed at: 4 days ago - Stars: 32 - Forks: 0
ryanweideman/3d-terminal-renderer
A simple 3d graphics engine that renders directly to the terminal
Language: Rust - Size: 21.7 MB - Last synced at: 3 months ago - Pushed at: 3 months ago - Stars: 31 - Forks: 1
GoncaloFDS/Lift
Vulkan Path Tracer with Optix Denoiser integration
Language: C++ - Size: 379 MB - Last synced at: almost 2 years ago - Pushed at: almost 4 years ago - Stars: 30 - Forks: 5
stanislawfortonski/3D-Engine-OpenGL-4
3D Graphics Engine For Games | C++ OpenGL 4.1
Language: C++ - Size: 228 KB - Last synced at: 13 days ago - Pushed at: over 4 years ago - Stars: 30 - Forks: 8
quyse/inanity
Cross-platform C++ game engine.
Language: C++ - Size: 65.5 MB - Last synced at: about 1 year ago - Pushed at: over 3 years ago - Stars: 29 - Forks: 5
ExtinctionHD/SteelEngine
Render engine with Vulkan API backend and RTX support
Language: C++ - Size: 203 MB - Last synced at: 1 day ago - Pushed at: 1 day ago - Stars: 27 - Forks: 6
WolfSource/WolfEngine 📦
Wolf is a set of modules for real-time rendering, real-time streaming and game developing
Language: C++ - Size: 6.49 GB - Last synced at: 4 days ago - Pushed at: over 1 year ago - Stars: 27 - Forks: 8
mosra/magnum-extras
Extras for the Magnum C++11 graphics engine
Language: C++ - Size: 7.71 MB - Last synced at: 8 days ago - Pushed at: 8 days ago - Stars: 26 - Forks: 12
vekjja/in3D
A relatively simple Go powered OpenGL Graphics Engine
Language: Go - Size: 208 MB - Last synced at: 28 days ago - Pushed at: 3 months ago - Stars: 22 - Forks: 3
mandyedi/raytracing-from-the-ground-up
This project aims to finish the source code examples of the book Ray Tracing from the Ground Up.
Language: C++ - Size: 8.28 MB - Last synced at: 4 months ago - Pushed at: 4 months ago - Stars: 22 - Forks: 15
EldarMuradov/EraEngine
C++ open source 3D game engine
Language: C++ - Size: 181 MB - Last synced at: about 1 year ago - Pushed at: about 1 year ago - Stars: 22 - Forks: 3
Hongtae/DKGL
Cross platform 3D Game & Graphics Library
Language: C - Size: 47.1 MB - Last synced at: 21 days ago - Pushed at: about 2 years ago - Stars: 21 - Forks: 1
deccer/EngineKit
Abstraction over modern OpenGL
Language: C# - Size: 292 MB - Last synced at: about 1 month ago - Pushed at: 4 months ago - Stars: 20 - Forks: 0
QuartermindGames/hei
Small utility library that serves as an abstraction layer between your application and everything else.
Language: C - Size: 15.6 MB - Last synced at: 7 days ago - Pushed at: 7 days ago - Stars: 19 - Forks: 4
mosra/magnum-bindings
Bindings of the Magnum C++11 graphics engine into other languages
Language: C++ - Size: 1.85 MB - Last synced at: 8 days ago - Pushed at: 8 days ago - Stars: 19 - Forks: 13