void

basic 2D game library.

Installation

npm install --save @oidoid/void

Native Dependencies

• Aseprite
• cwebp

Development

Local Development

1. clone void as a sibling directory of the game.
2. npm link ../void from the game.
3. add customConditions to the root tsconfig for esbuild and a void reference for tsc. Eg:

{
  "extends": "./tsconfig.prod.json",
  "compilerOptions": {
    "customConditions": ["dev"],
  },
  "references": [{"path": "../void"}]
}

it's possible to use "paths": {"@oidoid/void": ["../void/src"]} instead of or in addition to customConditions. 4. for unit tests, run with NODE_OPTIONS=--conditions=dev.

Declaration Merging

to avoid threading template parameters throughout all code, declaration merging is used for the following:

• AtlasMap
• CamSchema
• CamUpdater
• Debug
• Draw
• DrawSchema
• Ent
• EntSchema
• LevelZoo
• Loader
• PoolMap
• ReturnTag
• Sys

it's similar to modifying HTMLElementTagNameMap.

Queries

queries declare system dependencies.

sprite is a kind of common denominator for position and area. if the ent should have no visual representation, leave the sprite as hidden.

ECS Order

lists then ents are typically updated in insertion order. the cam and then cursor ents should appear first.

components are parsed and updated in key order. the recommended order is:

• debugInput
• id
• name
• text
• sprite
• textWH
• cursor
• hud
• ninePatch
• button
• textXY
• invalid
• override

systems are uniquely associated with a key. zero or one system per key. if multiple keys on an ent are associated with a system, it will be run multiple times per update.

Schema

there are two schemas: a game configuration (void.json) and level configs (*.level.jsonc). the parser assumes a valid schema to minimize code size.

levels are described with the level schema. some schema components may only be applied at parse time.

Invalid

ents and subsystems self-report as invalid when an update or render is required. ents should avoid reading another ent's invalid state since it's cleared once that ent has been updated.

Copyright and License

© oidoid.

AGPL-3.0-only

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

This program 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 Affero General Public License for more details.

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

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