CURIO Code

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Preview

Panel

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Status

Status: unknown
Last script: –

Uniforms

NameValue

Lands in the script's uniforms table on the next frame, in the preview and on a connected panel. One number is a float; 2 to 4 numbers make a vector.

Reference

Read the docs: guides, the full API, and how compiled shaders work.

Lifecycle: _init() once, _update(dt) and _draw() every frame.
Drawing: gfx.cls(r,g,b) gfx.pset(x,y,r,g,b) gfx.rectfill(x,y,w,h,r,g,b) gfx.line(x0,y0,x1,y1,r,g,b) with colours 0..255; gfx.width(), gfx.height().
Shaders: gfx.fill(fragment) calls fragment(x, y, u) per pixel; return r, g, b in 0..1 or a vec3.
Compiled: With the switch on Compiled, fragment is compiled here and uploaded with the script as shader. Draw with gfx.fill(shader or fragment): the same picture, several times faster. A script to be compiled keeps tables and strings inside its _ functions; the fragment itself takes numbers, vectors, if, and for with fixed bounds. Declare what it reads with -- @uniform name type.
Vectors: vec2 vec3 vec4, swizzles p.xy, and sin mix smoothstep clamp step length normalize dot cross hash noise fbm on vectors. math.* stays scalar.
Limits: 512 KB heap, 2 M Lua instructions per frame, scripts up to 24 KB. print goes to the preview's console and the panel's serial port.