Coding Specification

Every smoothstep.io animation must define a mainImage function with the following signature:

void mainImage(out vec4 fragColor, in vec2 fragCoord) {
  fragColor.rgb = vec3(1., 0., 0.);
}

(This is the same as Shadertoy shaders.)

Input Uniforms

Animations may also use any of the following input variables (uniforms):

variable	description
`int iFrame`	The index of the current frame.
`float iTime`	The time into the animation that the current frame is being rendered at.
`sampler2D iPrevFrame`	The contents of the previously rendered frame.
`vec2 iResolution`	The resolution of the frame being rendered in pixels.
`float iDuration`	The total duration of the animation in seconds.
`sampler2D iTexture0` etc.	The contents of the textures.
`float iFloat0` etc.	The value of the animated parameters, controlled by the animation timeline.