Serpent: Updates

Friday, November 1, 2019 - Ikey Doherty (CEO)
Posted in Engine Updates

It’s been a real busy time for us here at Lispy Snake, Ltd. Today we’ll update you with where we’re at, and where we’re going. Literally. Long story short we’re only about one week away from restoring feature parity with lispysnake2d and going far beyond that. We’re pretty darn proud of how the project is shaping up, with all the development happening in public.

Quick Support Call Out

Normally we stick this fella down the bottom of the page, but that’s in contradiction of the top-third rule. So far, we’ve seen 75 licenses purchased from The Game Raiser campaign. Honestly, that’s really awesome, and we’re super grateful for it.

With the dramatic progress we’ve been making lately on serpent, now’s a great time for you to invest in a great open source framework and top-quality games for you in future.

As a show of our dedication, we’re fixing the Lispy Snake website messaging to reflect what we’re good at: We’re an open source, indie game studio. On top of that, we’re going to empower others to create new content for the enjoyment of everyone.

Buy The Game Raiser Lifetime License

Buy a Lifetime License for lifetime access to all of our upcoming 2D game titles. This support will vastly reduce time-to-market, as well as getting the engine open sourced much sooner. Cheap price, good results, and open source improvements. Winning. Remember, we will only issue 1,000 licenses in total.


Right now we’ve got Serpent to a point it can render a basic quad on screen. While this may sound thoroughly unimpressive, given the short time we’ve worked on porting lispysnake2d to D, this is huge in terms of progress. Oh, and all that rendering is platform-independent thanks to bgfx. Our screenshots show us using Vulkan, but we can quite happily support Metal, OpenGL, and more.

At the time of writing the Serpent codebase has seen 122 commits, and a distinct architecture is emerging. It follows a data-driven design, making no distinction between 2D and 3D entities.

Internally, we create a class of serpent.Entity (such as a Player or even EnemyShip) which contains an array of vector positions at minimum. As the codebase expands, we’ll add tagging of Entity types so that the corresponding Renderer types will be responsible for drawing certain kinds of data.

Right now, all of our work is focused on the initial SpriteRenderer, which uses bgfx behind the scenes to draw textured quads using OpenGL. We’ve hit some roadbumps along the way, such as bimg having no C API (thus unusable from dlang). To correct this, we’re now using SDL_Image to support loading of PNG assets at runtime. In future, Serpent will also support KTX and DDS (direct draw surface) files to load hardware optimised textures instead.


We’re building various thin layers on top of our support libraries to make serpent more usable to ourselves, and end users. We’re also trying to do so in a way that leverages the language-level features. Part of our exploratory work has seen us using std.signals module of D Lang for input handling:


Wrapping It All Up

The (still developing) architecture is making it very easy to create games, with a focus on cross-platform functionality and ease of use. Here is the main routine from our in-tree demo that we’re working on:

import serpent;

int main()
    auto context = new Context();
    context.display.title("Serpent").size(1366, 768);
    context.display.pipeline.addRenderer(new SpriteRenderer());

    return DemoGame());

Note that the API is subject to constant change and improvement, so this should not be considered indicative of final release quality.


Our eventual aim is that Serpent be deployed in an SDK fashion. We’re not going to ram editors down your throat. What we will do, is create packages with the various requirements for creating apps and games using the serpent game framework. This’ll include the version of bgfx that we utilise, along with the runtime tools like shaderc, texturec, etc.

As part of our scripting and tooling, we’ll make it very trivial to build Serpent games for multiple targets, so you can get them deployed easier. Triple-A quality processes and software for indie developers is our dream.

Halloween Tech Demo

We’re a little bit delayed on the Halloween tech demo, but that was to be expected given our shift from the original C engine, to a D-lang cross-platform framework. Despite this, we’ll still be putting out the Halloween-inspired tech demo as soon as feasible, purely to demonstrate progress on the Serpent framework.


Lispy Snake, Ltd. will be relocating to the Republic of Ireland. This is because I myself am moving. No changes will be made to the company outside of this, and all licenses will (obviously) be retained. A formal switch to a ROI-incorporated company will be announced some time in the future.

Long story short: Everybody wants stability and a great quality of life for their family. Speaking from a business point of view we want certain guarantees that cannot be provided in the current Brexit-infused climate. Note: This is the one and only time we’ll mention anything vaguely political here. We don’t do politics.