Shadertoy

Minimalistic environment using OpenGL, GLEW, and GLFW for GLSL shader art and image processing.

Features

• #include directive support for glsl files
• texture support
• micro-librarys for:
  • basic shapes
  • fractal coloring
  • random number generation
  • color conversion (quite inefficient)

Shaders

• mandelbrot set
• julia set with mouse positon varying c parameter
• sphere
• loading screen

Image filters

• halftone in grayscale with horizontal and vertical dot travel
• halftone in color (rgb) with dot travel and angle offset
• kuwahara filter
• palette quantization to specified color palette
• luminance quantization with color preservation using value from hsv mapped colors
• ordered dithering with 2x2 threshold map with equaly spaced color palette

Possible improvements

• generalized kuwahara filter
• more efficient color conversion
• ordered dithering with larger precalculated threshold maps
• time or mouse position varying parameters for all filters and shaders

Resources

• Basic framework based on https://www.youtube.com/@TheCherno
• GLSL The Book of Shaders https://thebookofshaders.com/
• Shaping functions visualization https://graphtoy.com/
• Color palette generator https://coolors.co/