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README.md

td-shadertoy

Built in TouchDesigner version - 2019.20140

td-shadertoy.toe is a collection of TouchDesigner components that can be used to convert and browse Shadertoy shaders via the Shadertoy API.

WARNING

YOU CANNOT USE A SHADER COMMERCIALLY WITHOUT PERMISSION FROM THE AUTHOR

If you wish to use a Shadertoy shader in a commercial environment, you must contact the original author of the shader and obtain permission. The shadertoyConverter component has a button to Open Site which will open the shader on the Shadertoy website where you will find the author's contact information. Usually the author will include the license information as a comment in the shader's code.

shadertoyConverter

Screenshot1

  • Requests the json object from the API
  • Modifies the shader code
  • Generates and routes samplers

Screenshot3

  • API Key
  • Shader ID
    • The ID of the shader to download e.g. shadertoy.com/view/3ld3Dn
  • Load
    • Load the shader
  • Open Site
    • Open up the shader in a web browser
  • Reset Time
    • Reset the internal clock to 0

shadertoyBrowser

Screenshot4

  • Uses the API to return a list of shader IDs
  • Uses a replicator to copy the shadertoyConverter for each returned ID

Screenshot2

  • API Key
  • Render Size
    • Set the resolution of each shader
  • Start
    • Set the start index of the search
  • Results
    • The max number of results to return
  • Search Term
    • The search query
    • Leaving this blank will search all
  • Sort
    • The method to sort the search results

Converting from Shadertoy to TouchDesigner

Below you will find exmples of several differences between the way shaders are written in Shadertoy and TouchDesigner. These differences need to be addressed in order to compile the shader code in TouchDesigner. This is done automatically when the shadertoyConverter component loads a shader.

  • Shadertoy provides a default set of useful uniforms. These can simply be prepended to each shader's code and added in the uniform parameters of the glsl TOP.
uniform vec3      iResolution;           // viewport resolution (in pixels)
uniform float     iTime;                 // shader playback time (in seconds)
uniform float     iTimeDelta;            // render time (in seconds)
uniform int       iFrame;                // shader playback frame
uniform float     iChannelTime[4];       // channel playback time (in seconds)
uniform vec4      iMouse;                // mouse pixel coords. xy: current (if MLB down), zw: click
uniform vec4      iDate;                 // (year, month, day, time in seconds)
uniform float     iSampleRate;           // sound sample rate (i.e., 44100)
  • The Shadertoy main loop is called mainImage() rather than main() and expects texture coordinates in pixel space. This can be addressed by appending the following main() function code which calls mainImage() and passes in the color buffer as well as the expected pixel coordinates.
layout (location = 0) out vec4 TDColor;
void main()
{
	mainImage(TDColor, vUV.st*iResolution.xy);
}
  • TouchDesigner provides input samplers as array objects named sTD2DInputs and sTDCubeInputs (cubemaps). Shadertoy refers to all types of samplers as iChannel so the sampler names must be substituted according to the sampler type. iChannelResolution must also be modified to use the TouchDesigner provided texture info array uTD2DInfos
if ctype == 'cubemap':
	code = code.replace('iChannel' + str(channel), 'sTDCubeInputs[' + str(channel) + ']')
	code = code.replace('iChannelResolution[' + str(channel) + ']', 'vec2(uTDCubeInfos[' + str(channel) + '].res.zw)')
else:
	code = code.replace('iChannel' + str(channel), 'sTD2DInputs[' + str(channel) + ']')
  • If an additional common file is used, a reference must be included.
code += textwrap.dedent('''
#include <../common>
''')

Known Issues

  • Not all shaders are made available in the API as the shader's creator must choose to allow the shader to be available in the API when they publish it. Some publicly published shaders will not load because this option was not selected.

  • Shaders that rely on specific sampler wrap and filter conditions may have issues displaying correctly. In Shadertoy, users are allowed to set these settings individually for each shader's input channel but the glsl TOP in TouchDesigner only allows the user set this globally.

  • Cubemap shaders are not currently supported.

Links

matthewwachter.com

Shadertoy

Shadertoy API Documentation

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