webglsl-mandel

A GPU-accelerated fractal viewer.

Try out on http://divVerent.github.io/webglsl-mandel/

Features

• Fast parameter editing.
• Scrolling by dragging.
• Zooming by mouse wheel (desktop) or pinching (mobile).
• Custom formulas in GLSL.

Formula syntax

Formulas are directly evaluated in GLSL; for convenience a few functions are provided. Do not use other constructs, as they may not work as you think!

• Variables:
  • z: the current iterator variable (Mandelbrot: initialized to the fixed parameter; Julia: initialized to the fragment position).
  • c: the current parameter (Mandelbrot: current fragment position; Julia: fixed parameter)
• Low level complex operations:
  • vec2(r1, r2): building a complex number from reals
  • z.x: real component
  • z.y: imaginary component
  • z*conj: conjugation
  • cabs(z): absolute value
  • cabs2(z): squared absolute value
  • carg(z): argument
• Elementary operations:
  • z1 + z2: addition
  • z1 - z2: subtraction
  • z1 * r: multiplication with real
  • cmul(z1, z2): multiplication with complex
  • z1 / r: division by real
  • cdiv(z1, z2): division by complex
• More complex-valued functions:
  • cexp(z): exponentiation
  • clog(z): logarithm
  • cpow(z1, z2): power
  • csin(z): sine
  • ccos(z): cosine
  • ctan(z): tangent
  • ccot(z): cotangent
• Constants:
  • u: the unity (same as vec2(1, 0))
  • i: the imaginary unit (also reachable as j, same as vec2(0, 1))
  • M_E: Euler's number
  • M_PI: Archimedes' constant