Siv3D (formerly known as OpenSiv3D) is a C++20 framework for creative coding (2D/3D games, media art, visualizers, and simulators). Siv3D applications run on Windows, macOS, Linux, and the Web.

Features

Graphics
- Advanced 2D graphics
- Basic 3D graphics (Wavefront OBJ, primitive shapes)
- Custom vertex / pixel shaders (HLSL, GLSL)
- Text rendering (Bitmap, SDF, MSDF)
- PNG, JPEG, BMP, SVG, GIF, Animated GIF, TGA, PPM, WebP, TIFF
- Unicode 15.1 emojis and 7,000+ icons
- Image processing
- Video rendering
Audio
- WAVE, MP3, AAC, OggVorbis, Opus, MIDI, WMA*, FLAC*, AIFF*
- Adjustable volume, pan, play speed and pitch
- File streaming (WAVE, MP3, OggVorbis)
- Fade in and fade out
- Looping
- Mixing busses
- Filters (LPF, HPF, echo, reverb)
- FFT
- SoundFont rendering
- Text to speech*
Input
- Mouse
- Keyboard
- Gamepad
- Webcam
- Microphone
- Joy-Con / Pro Controller
- XInput*
- Digital drawing tablet*
- Leap Motion*
Window
- Fullscreen mode
- High DPI support
- Window styles (sizable, borderless)
- File dialog
- Drag & drop
- Message box
- Toast notification*
Network and communication
- HTTP client
- Multiplayer (with Photon SDK)
- TCP communication
- Serial communication
- Interprocess communication (pipe)
- OSC (Open Sound Control)
Math
- Vector and matrix classes (Point, Float2, Vec2, Float3, Vec3, Float4, Vec4, Mat3x2, Mat3x3, Mat4x4, SIMD_Float4, Quaternion)
- 2D shape classes (Line, Circle, Ellipse, Rect, RectF, Triangle, Quad, RoundRect, Polygon, MultiPolygon, LineString, Spline2D, Bezier2, Bezier3)
- 3D shape classes (Plane, InfinitePlane, Sphere, Box, OrientedBox, Ray, Line3D, Triangle3D, ViewFrustum, Disc, Cylinder, Cone)
- Color classes (Color, ColorF, HSV)
- Polar / cylindrical / spherical coordinates system
- 2D / 3D shape intersection
- 2D / 3D geometry processing
- Rectangle packing
- Planar subdivisions
- Linear and gamma color space
- Pseudo random number generators
- Interpolation, easing, and smoothing
- Perlin noise
- Math parser
- Navigation mesh
- Extended arithmetic types (HalfFloat, int128, uint128, BigInt, BigFloat)
String and Text Processing
- Advanced String class (String, StringView)
- Unicode conversion
- Regular expression
- {fmt} style text formatting
- Text reader / writer classes
- CSV / INI / JSON / XML / TOML reader classes
- CSV / INI / JSON writer classes
- JSON Validation
Misc
- Basic GUI (button, slider, radio buttons, checkbox, text box, color picker, list box, menu bar, table)
- Integrated 2D physics engine (Box2D)
- Advanced array / 2D array classes (Array, Grid)
- Kd-tree
- Disjoint set
- Asynchronous asset file streaming
- Data compression (zlib, Zstandard)
- Transitions between scenes
- File system
- Directory watcher
- QR code reader / writer
- GeoJSON
- Date and time
- Stopwatch and timer
- Logging
- Serialization
- UUID
- Child process
- Clipboard
- Power status
- Scripting (AngelScript)
- OpenAI API (Chat, Vision, Image, Speech, Embedding)

* Some features are limited to specific platforms

How to Install Siv3D + Tutorial

(English) Getting Started with Siv3D: https://siv3d.github.io/en-us/
(日本語) Siv3D をはじめよう: https://siv3d.github.io/ja-jp/

v0.6.16 | released 7 April 2025 | Release Notes

| Platform | SDK | Requirements | |:------------------:|:----------:|:------------------------------| | Windows | Download SDK / SDK をダウンロード | - Windows 10 / 11 (64-bit) - Microsoft Visual C++ 2022 17.10 - Windows 10 SDK - Intel / AMD CPU | | macOS | Download SDK / SDK をダウンロード | - macOS Ventura / Sonoma / Sequoia - Xcode 14.3 or newer - Intel CPU / Apple Silicon (Rosetta mode)* - OpenGL 4.1 compatible hardware | | Linux | Compiling for Linux / Linux 版のビルド | - Ubuntu 20.04 LTS / 22.04 LTS - GCC 9.3.0 (with Boost 1.71.0) / GCC 11.2 (with Boost 1.74.0) - Intel / AMD CPU - OpenGL 4.1 compatible hardware |

* Native support for Apple Silicon is planned for Siv3D v0.8. Currently, Siv3D can be built and run using Rosetta emulation.

Next Major Update

The next major update, Siv3D v0.8, is under development in the following repository.

https://github.com/Siv3D/siv8

Community

Siv3D Discord Server

Miscellaneous

Supporting the Project

If you would like to support the project financially, visit my GitHub Sponsors page. Your support will accelerate the development of this exciting framework.

💗 https://github.com/sponsors/Reputeless

Examples

1. Hello, Siv3D!

Screenshot

# include <Siv3D.hpp>

void Main()
{
	// 背景の色を設定する | Set the background color
	Scene::SetBackground(ColorF{ 0.6, 0.8, 0.7 });

	// 画像ファイルからテクスチャを作成する | Create a texture from an image file
	const Texture texture{ U"example/windmill.png" };

	// 絵文字からテクスチャを作成する | Create a texture from an emoji
	const Texture emoji{ U"🦖"_emoji };

	// 太文字のフォントを作成する | Create a bold font with MSDF method
	const Font font{ FontMethod::MSDF, 48, Typeface::Bold };

	// テキストに含まれる絵文字のためのフォントを作成し、font に追加する | Create a font for emojis in text and add it to font as a fallback
	const Font emojiFont{ 48, Typeface::ColorEmoji };
	font.addFallback(emojiFont);

	// ボタンを押した回数 | Number of button presses
	int32 count = 0;

	// チェックボックスの状態 | Checkbox state
	bool checked = false;

	// プレイヤーの移動スピード | Player's movement speed
	double speed = 200.0;

	// プレイヤーの X 座標 | Player's X position
	double playerPosX = 400;

	// プレイヤーが右を向いているか | Whether player is facing right
	bool isPlayerFacingRight = true;

	while (System::Update())
	{
		// テクスチャを描く | Draw the texture
		texture.draw(20, 20);

		// テキストを描く | Draw text
		font(U"Hello, Siv3D!🎮").draw(64, Vec2{ 20, 340 }, ColorF{ 0.2, 0.4, 0.8 });

		// 指定した範囲内にテキストを描く | Draw text within a specified area
		font(U"Siv3D (シブスリーディー) は、ゲームやアプリを楽しく簡単な C++ コードで開発できるフレームワークです。")
			.draw(18, Rect{ 20, 430, 480, 200 }, Palette::Black);

		// 長方形を描く | Draw a rectangle
		Rect{ 540, 20, 80, 80 }.draw();

		// 角丸長方形を描く | Draw a rounded rectangle
		RoundRect{ 680, 20, 80, 200, 20 }.draw(ColorF{ 0.0, 0.4, 0.6 });

		// 円を描く | Draw a circle
		Circle{ 580, 180, 40 }.draw(Palette::Seagreen);

		// 矢印を描く | Draw an arrow
		Line{ 540, 330, 760, 260 }.drawArrow(8, SizeF{ 20, 20 }, ColorF{ 0.4 });

		// 半透明の円を描く | Draw a semi-transparent circle
		Circle{ Cursor::Pos(), 40 }.draw(ColorF{ 1.0, 0.0, 0.0, 0.5 });

		// ボタン | Button
		if (SimpleGUI::Button(U"count: {}"_fmt(count), Vec2{ 520, 370 }, 120, (checked == false)))
		{
			// カウントを増やす | Increase the count
			++count;
		}

		// チェックボックス | Checkbox
		SimpleGUI::CheckBox(checked, U"Lock \U000F033E", Vec2{ 660, 370 }, 120);

		// スライダー | Slider
		SimpleGUI::Slider(U"speed: {:.1f}"_fmt(speed), speed, 100, 400, Vec2{ 520, 420 }, 140, 120);

		// 左キーが押されていたら | If left key is pressed
		if (KeyLeft.pressed())
		{
			// プレイヤーが左に移動する | Player moves left
			playerPosX = Max((playerPosX - speed * Scene::DeltaTime()), 60.0);
			isPlayerFacingRight = false;
		}

		// 右キーが押されていたら | If right key is pressed
		if (KeyRight.pressed())
		{
			// プレイヤーが右に移動する | Player moves right
			playerPosX = Min((playerPosX + speed * Scene::DeltaTime()), 740.0);
			isPlayerFacingRight = true;
		}

		// プレイヤーを描く | Draw the player
		emoji.scaled(0.75).mirrored(isPlayerFacingRight).drawAt(playerPosX, 540);
	}
}

2. Breakout