In this project I implemented some very simple fragment shaders.
I implemented:
Image Negative
3x3 Gaussian Blur
Image Grayscale
Sobel Edge Detector
"Toon Shading"
5x5 Median filter
HSV Color Shifter
Pixelator
5x5 Median:
A simple median filter with a 5x5 kernel. Nothing fancy, implemented with a simple loop to collect samples then another to sort.
HSV Color Shifter:
Transforms the image from RGB to HSV color space, replaces the hue channel with a time varying uniform then converts back to RGB for display.
Pixelator:
Straight forward pixeletor using a time varying uniform to make it interesting.
For ease of access on the c++ I added a glut context menu and keyboard commands to switch between shaders.
I also implemented some webGL vertex shaders:
Sine Wave
Simplex Noise
Potential Functions
The potential functions use the sum of the inverse square distance from five points modulated by simplex noise as input to a sigmoid function to achieve a nice smooth rounded look.
Menu
Potential Functions
Blogpost: http://liamboone.blogspot.com/2012/11/project-4-shaders.html