FabGL
ESP32 Display Controller and Graphics Library
FabGL Library

www.FabGL.com - 2019 by Fabrizio Di Vittorio (fdivi.nosp@m.tto2.nosp@m.013@g.nosp@m.mail.nosp@m..com)


FabGL is mainly a Graphics Library for ESP32. It implements several display drivers (for direct VGA output and for I2C and SPI LCD drivers).
FabGL can also get input from a PS/2 Keyboard and a Mouse. FabGL implements also: an Audio Engine, a Graphical User Interface (GUI), a Game Engine and an ANSI/VT Terminal.

This library works with ESP32 revision 1 and upper.

VGA output requires a digital to analog converter (DAC): it can be done by three 270 Ohm resistors to have 8 colors, or by 6 resistors to have 64 colors.

There are several fixed and variable width fonts embedded.

Unlimited number of sprites are supported. However big sprites and a large amount of them reduces the frame rate and could generate flickering.

When there is enough memory (on low resolutions like 320x200), it is possible to allocate two screen buffers, so to implement double buffering.
In this case primitives are always drawn on the back buffer.

Except for double buffering or when explicitly disabled, all drawings are performed on vertical retracing (using VGA driver), so no flickering is visible.
If the queue of primitives to draw is not processed before the vertical retracing ends, then it is interrupted and continued at next retracing.

There is a graphical user interface (GUI) with overlapping windows and mouse handling and a lot of widgets (buttons, editboxes, checkboxes, comboboxes, listboxes, etc..).

Finally, there is a sound engine, with multiple channels mixed to a mono output. Each channel can generate sine waveforms, square, etc... or custom sampled data.


The main classes of FabGL library are:

Other classes are:

See Configuring VGA outputs for VGA connection sample schema.

See Configuring PS/2 port for PS/2 connection sample schema.

See Configuring Audio port for audio connection sample schema.

See Generic Circuit Diagram for a generic complete circuit diagram.


Installation Tutorial


Space Invaders Example


Graphical User Interface - GUI Example


Audio output demo


Simple Terminal Out Example


Altair 8800 Emulator


Commodore VIC20 Emulator


Network Terminal Example


Modeline Studio Example


Loopback Terminal Example


Double Buffering Example


Collision Detection Example


Created by Fabrizio Di Vittorio (fdivi.nosp@m.tto2.nosp@m.013@g.nosp@m.mail.nosp@m..com) - http://www.fabgl.com
Copyright (c) 2019 Fabrizio Di Vittorio.
All rights reserved.

This file is part of FabGL Library.

FabGL is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

FabGL is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with FabGL. If not, see http://www.gnu.org/licenses/.