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https://github.com/Nikaoto/deep
Add Z axis and drawing layers to Love2D (or any Lua framework)
https://github.com/Nikaoto/deep
Last synced: 6 days ago
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Add Z axis and drawing layers to Love2D (or any Lua framework)
- Host: GitHub
- URL: https://github.com/Nikaoto/deep
- Owner: Nikaoto
- License: mit
- Created: 2017-10-08T11:39:23.000Z (about 7 years ago)
- Default Branch: master
- Last Pushed: 2024-05-15T12:01:58.000Z (6 months ago)
- Last Synced: 2024-08-02T06:16:54.377Z (3 months ago)
- Language: Lua
- Homepage:
- Size: 21.4 MB
- Stars: 70
- Watchers: 5
- Forks: 3
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-love2d - deep - Adds Z axis; allows you to queue actions and draw calls. (Drawing)
- awesome-playdate - deep - An "action-queue" library; helpful for things like z-indexing (although the Playdate already has z-index support in its draw ordering). (Game Development / Programming Frameworks & Languages)
README
```
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██║ ██║█████╗ █████╗ ██████╔╝
██║ ██║██╔══╝ ██╔══╝ ██╔═══╝
██████╔╝███████╗███████╗██║
╚═════╝ ╚══════╝╚══════╝╚═╝
```
**deep** is a tiny high-performance library that lets you add drawing layers and
a Z axis to any graphics framework in Lua. Insteaad of z-sorting your draw calls,
deep lets you keep a schedule which is executed in order.
## Usage
After placing `deep.lua` inside your project:
```lua
deep = require("deep")
layer = deep:new()
-- Queue actions. These actions can be drawcalls or anything at all.
layer:queue(3, function() print("wound!") end)
layer:queue(1, function() print("It's just") end)
layer:queue(2, function() print("a flesh") end)
-- Execute all actions in the layer
layer:draw()
```
This will print:
```
It's just
a flesh
wound!
```
## Documentation (just 3 functions)
### `deep:new()`
Returns a new drawing layer that holds its own queue of actions (its z-axis).
You can have multiple layers which get drawn one after the other, or not drawn at all:
```lua
background_layer = deep:new()
game_object_layer = deep:new()
ui_layer = deep:new()
function love.draw()
-- Queue the actions for drawing stuff
background_layer:queue(...)
game_object_layer:queue(...)
ui_layer:queue(...)
-- With this, we will have the ui drawing over the game_objects.
-- And both will be drawn in front of the background.
background_layer:draw()
game_object_layer:draw()
ui_layer:draw()
end
```
### `layer:queue(z, fn)`
Queues a function for execution at index `z`, which **must** be an integer. It can
be negative, positive or zero. Using a float or any other type here will not
queue the action.
### `layer:restrict(z_from, z_to)`
Used for culling drawcalls that don't fall into the given z interval.This is
basically a primitive way to do frustum-culling to optimize your performance.
You most likely won't need this as you'll have your own way to cull objects.
```lua
function love.draw()
-- This will get added to the queue, but because of the restrict statement,
-- it won't get drawn when layer:draw() is called.
layer:queue(102, function() print("hi") end)
layer:restrict(100, 120)
-- This will not get added to the queue
layer:queue(101, function() draw_something() end)
-- Will not do anything, because we have no valid actions
layer:draw()
end
```
## Example
To achieve this, you could do the following:
```lua
deep = require("deep")
layer = deep:new()
-- The z index of the red cube
current_z = 1
function love.draw()
-- Queue the three horizontal lines
layer:queue(2, function() draw_strip(200, 60) end)
layer:queue(3, function() draw_strip(200, 80) end)
layer:queue(4, function() draw_strip(200, 100) end)
-- Red square, which can move through z axis
layer:queue(current_z, function()
-- Draws a red square
love.graphics.setColor(1, 0, 0)
love.graphics.rectangle("fill", 300, 40, 80, 80)
end)
-- Draw everything in the queue
layer:draw()
end
-- Increases/decreases red square z on key press
function love.keypressed(key)
if key == "up" then
current_z = current_z + 1
elseif key == "down" then
current_z = current_z - 1
end
end
-- Draws a horizontal white strip
function draw_strip(x, y)
love.graphics.setColor(1, 1, 1)
love.graphics.rectangle("fill", x, y, 300, 10)
end
```
## Movement example
The `example/` directory has a slightly more involved demonstration of deep.
Run `love example` from the root of this repository to get this:
## Games using deep
### Gnomber
Available on Steam: https://store.steampowered.com/app/2800770/Gnomber/
### Shamen
A small jam game I with an older version of deep.
Github source: https://github.com/nikaoto/shamen
## Possible speed optimizations
- Preallocate the queue with `table.new()` (only works in LuaJIT)
- Clear the queue on each exec with `table.clear()` (only works in LuaJIT)