mirror of
https://github.com/Reuh/ubiquitousse.git
synced 2025-10-27 09:09:30 +00:00
82 lines
3.2 KiB
Lua
82 lines
3.2 KiB
Lua
-- abstract
|
|
|
|
--- Abstract Engine.
|
|
-- Main module, containing the abstract things.
|
|
-- The API exposed here is the Abstract API.
|
|
-- It is as the name imply abstract, and must be implemented in a backend, such as abstract.love.
|
|
-- When required, this file will try to autodetect the engine it is running on, and load a correct backend.
|
|
--
|
|
-- abstract may or may not be used as a full game engine. You can delete the modules files you don't need and abstract
|
|
-- should adapt accordingly.
|
|
--
|
|
-- For backend writers:
|
|
-- If a function defined here already contains some code, this means this code is mandatory and you must put/call
|
|
-- it in your implementation.
|
|
-- Also, a backend file shouldn't redefine the abstract table itself but only redefine the backend-dependant fields.
|
|
-- The API doesn't make the difference between numbers and integers, so convert to integers when needed.
|
|
--
|
|
-- Abstract's goal is to run everywhere with the least porting effort possible.
|
|
-- To achieve this, the engine needs to stay simple, and only provide features that are almost sure to be
|
|
-- available everywhere, so writing a backend should be straighforward.
|
|
-- However, Abstract still make some small assumptions about the engine:
|
|
-- * The engine has some kind of main loop, or at least a function called very often (may or may not be the
|
|
-- same as the redraw screen callback).
|
|
-- * 32bit color depth.
|
|
--
|
|
-- Regarding data formats, Abstract reference implemtations expect and recommend:
|
|
-- * For images, PNG support is expected.
|
|
-- * For audio files, OGG Vorbis support is expected.
|
|
-- * For fonts, TTF support is expected.
|
|
-- Theses formats are respected for the reference implementations, but Abstract may provide a script to
|
|
-- automatically convert data formats from a project at some point.
|
|
--
|
|
-- Units used in the API:
|
|
-- * All distances are expressed in pixels (px)
|
|
-- * All durations are expressed in milliseconds (ms)
|
|
--
|
|
-- Style:
|
|
-- * tabs for indentation, spaces for esthetic whitespace (notably in comments)
|
|
-- * no globals
|
|
-- * UPPERCASE for constants (or maybe not).
|
|
-- * CamelCase for class names.
|
|
-- * lowerCamelCase is expected for everything else.
|
|
--
|
|
-- Implementation levels:
|
|
-- * backend: nothing defined in abstract, must be implemented in backend
|
|
-- * mixed: partly implemented in abstract but must be complemeted in backend
|
|
-- * abstract: fully-working version in abstract, may or may not be redefined in backend
|
|
-- The implementation level is indicated using the "@impl level" annotation.
|
|
--
|
|
-- @usage local abstract = require("abstract")
|
|
|
|
local p = ... -- require path
|
|
local abstract
|
|
|
|
abstract = {
|
|
--- Abstract version.
|
|
-- @impl abstract
|
|
version = "0.0.1",
|
|
|
|
--- Backend name.
|
|
-- For consistency, only use lowercase letters [a-z] (no special char)
|
|
-- @impl backend
|
|
backend = "unknown"
|
|
}
|
|
|
|
-- We're going to require modules requiring abstract, so to avoid stack overflows we already register the abstract package
|
|
package.loaded[p] = abstract
|
|
|
|
-- Require external submodules
|
|
for _, m in ipairs({"time", "draw", "audio", "input", "scene", "event"}) do
|
|
local s, t = pcall(require, p.."."..m)
|
|
if s then abstract[m] = t end
|
|
end
|
|
|
|
-- Backend engine autodetect and load
|
|
if love then
|
|
require(p..".backend.love")
|
|
elseif package.loaded["ctr"] then
|
|
require(p..".backend.ctrulua")
|
|
end
|
|
|
|
return abstract
|