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https://github.com/tsteinholz/loveshaderconverter

Shadertoy :arrow_right: LÖVE GLSL || Converter
https://github.com/tsteinholz/loveshaderconverter

demo glsl love2d lua shaders shadertoy

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Shadertoy :arrow_right: LÖVE GLSL || Converter

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README 

        
# :beginner: Löve 2D Shader Cönverter 



This is a pretty straight forrward program that simpily converts the GLSL used in the [Shader Toy](https://www.shadertoy.com/) which is based on ES; to a version of GLSL that can be used by [LÖVE ](https://love2d.org/), which is based on GLSL 1.2 with custom calls for lua.



## Releases

So far we only have builds for Windows (x32 & x64) and Linux, but none for Mac. So if you're on a mac and you want to use this application you will have to compile it yourself unfortunatly. If you are on a Windows or Linux system, you can check out our [releases](https://github.com/tsteinholz/LoveShaderConverter/releases) for the latest binaries.



## Legal

This Program is under the M.I.T License, but all the shaders you convert with this program are entitled to their own licenses with their own terms. Please do your best to not infringe upon any of their terms because you will be held accountable for it.



## Commands and Arguments Usage

To call the program you have to be using a command line (bat or shell script works)



    LoveShaderConverter 

  

This creates `.bak` which contains the original code you copied from [Shader Toy](https://www.shadertoy.com/) and changes to contents of `` to have the GLSL that can be easily used by [LÖVE ](https://love2d.org/).



On Windows, run the file `LoveShaderConverter.bat`, this will give you a working interface to the program.



# Quick Guide

Here is a quick guid / demo using the software and how to implent it in love.



### Step 1 : Go Shopping :handbag:

Go to [Shader Toys](https://www.shadertoy.com/) and pick out a shader you would like to implement. For this demo,

I chose [This Shader](https://www.shadertoy.com/view/Mss3WN).



![alt text](https://raw.githubusercontent.com/tsteinholz/LoveShaderConverter/master/docs/imgs/step-1.png "Step 1")



### Step 2 : Copy the Source :clipboard:



Of coure keep in mind licenses and do-not steal code. Only when a license permits you to, copy-and-paste the

entirety of the code.



![alt text](https://raw.githubusercontent.com/tsteinholz/LoveShaderConverter/master/docs/imgs/step-2.png "Step 2")



### Step 3 : Paste :pencil2:

Simply paste your clipboard to a file and save it as something.



![alt text](https://raw.githubusercontent.com/tsteinholz/LoveShaderConverter/master/docs/imgs/step-3.png "Step 3")



## Step 4: Convert :nut_and_bolt:

Here's the fun part. Make sure you have a download of this project somewhere you can use it, in the command line,

in a shell script, in a bat file, somewhere put down this command.



    LoveShaderConverter 



Of course replace  with the atcual file name in the correct directory etc. If you mess something up, the

application will notify you.



![alt text](https://raw.githubusercontent.com/tsteinholz/LoveShaderConverter/master/docs/imgs/step-4.png "Step 4")



## Step 5 : Integrate with Love 2D :bulb:

This is where the tutorial stops for you if you plan to implement anything diffrently, for this demo I am making

a window for the sole purpose of rendering this shader and nothing else. So on that note, you need to set up a new

Love2D project, make a `conf.lua` and `main.lua` and give the files the according methods.



![alt text](https://raw.githubusercontent.com/tsteinholz/LoveShaderConverter/master/docs/imgs/step-5.png "Step 5")



Lets start with our local variables. We are loading a shader so lets add

```lua

local shader

```

We are going to render the shader to a canvas

```lua

local canvas

```

The output from the conversion told us we need the time

```lua

local time = 0

```



Now lets implement the load function!

```lua

function love.load(arg)

    -- Load the shader from the file we generated

    shader = love.graphics.newShader('MetaHexaBalls.glsl')

    -- Create a new Canvas to draw to

    canvas = love.graphics.newCanvas(800, 600)

end

```



Next the Update Function

```lua    

function love.update(dt)

    -- increment our pseudo time variable

    time = dt + time;

    -- When converting, the following variables were requested from the shader...

    shader:send('iResolution', { love.window.getWidth(), love.window.getHeight(), 1 })

    shader:send('iGlobalTime', time)

    shader:send('iMouse', { love.mouse.getX(), love.mouse.getY(), 0, 0 })

end

```



Last and definatly not least, the draw function

```lua

function love.draw()

    love.graphics.setCanvas(canvas)

    love.graphics.setShader(shader)

    love.graphics.draw(canvas)

    love.graphics.setShader()

    love.graphics.setCanvas()



    love.graphics.draw(canvas,0,0,0,1,1,0,0)

end

```



Full [main.lua](https://github.com/tsteinholz/LoveShaderConverter/blob/master/docs/demo/main.lua) file can be found here.



### Step 6 : Hit that run button :8ball:

The moment you have been waiting for, a beautiful shader rendered by love2d. Have fun ;)



![alt text](https://raw.githubusercontent.com/tsteinholz/LoveShaderConverter/master/docs/imgs/step-6.png "Step 6")



## TODO :

 * Multi-channel support

 * Remove boost?

 * Official Builds on Mac

 * Add license terms and a modified change list in the header

 * Flags? For example...

 * Generate Love Project that renders shader with [-g:--generate] flag?