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hydra-glsl

This hack/extension allows you to use glsl code almost directly inside Hydra. It adds 5 functions, 1 according to each type of glsl-function in hydra.

Example

glsl('vec4(sin(((_st.x*54.)+time*2.)*vec3(0.1,0.102,0.101)),1.0)')
   .diff(o0)
 .glslColor('vec4(c0.brg,1.)')
 .glslCoord('xy*=(1.0/vec2(i0, i0)); return xy',.25)
 .glslCombine('return c0-c1',o1)
 .glslCombineCoord('uv+(vec2(c0.r,c0.b)*0.1)',o1)
  .out()

Open in hydra!

Functions

function arguments after code corresponding type glsl arguments : aliases
glsl() ...args 'src' _st : st, uv, xy
osc().glslColor() ...args 'color' _c0 : c0, color
osc().glslCoord() ...args 'coord' _st : st, uv, xy
osc().glslCombine() texture, ...args 'combine' _c0 : c0, color0;_c1: c1, color1
osc().glslCombineCoord() texture, ...args 'combineCoord' _st : st, uv, xy;_c0: c0, color

Note that osc() is merely an example

Extra functions

function arguments after code corresponding type description
osc().glslHsv() ...args 'color' Converts to and from HSV. With your code being placed in between. Pre-defines the HSV converted values as a vec3 hsv

Arguments

Each function comes with 10 predefined inputs called i0,i1,i2...i9. All of which are defaulted to 1. You can use either these 10 arguments or define your own by sending them as arrays in the form of ['name',value].

Important

All inputs are float as of now.

Example

glsl('vec4(sin(uv.x*i0+(time*i1*vec3(i2,i2*2.,i2*3.))),1.0)',16,2,.3)
 .glslColor('vec4(c0.brg-(sin(c0.b)*myVariable),1.)',['myVariable',0.2])
 .out()

You can even send arguments as functions in typical Hydra manner:

glsl('vec4(sin(uv.x*i0+(time*i1*vec3(i2,i2*2.,i2*3.))),1.0)',16,2,.3)
 .glslColor('vec4(c0.brg-(sin(c0.b)*myVariable),1.)',['myVariable',()=>time%1])
 .out()

About the code (and lazy code)

  • You can straight up use any of the aliases mentioned above.
  • You can omit the semicolon at the end.
  • You can omit the return keyword.
  • You can use multiline code.
    • You can only omit the semicolon in the last line.
    • You can still omit the return keyword.
  • You can write your own c0s, sts or any other variables named like aliases mentioned above. The script checks if you defined any variables named like that before assigning the aliases.
  • You cannot use aliases as names of custom arguments

Tip

Have the browser's console open. Hydra doesn't show frag errors on the built-in console.

Note

This hack works by flooding either the global context (the window) or the GlslSource constructor with new Hydra functions. Don't be scared to find lots of functions called glsl_ext_NODE_-something.