Pix Shaders v.2.0

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About

A small package of various pixel shaders for processing textures in the Jitter OpenGL world. The abstractions give quick access to disable/enabling of the shaders, and setting parameters through lists of values or single values in inlets. Some are simply a wrapper for a jit.gl.slab object loaded with a shader that is shipped with Max8. Some are wrapped around a shader ported from shadertoy or coded by other creative minds! Original sources listed below. Others are shaders that I regularly use myself and coded for ease of reuse. The comments on the inlet explain the order of parameters. Open the help-patcher for further details and workings.

New

pix.blend, pix.displace, pix.delay, pix.feedback, pix.filter, pix.grid, pix.pong, pix.shift, pix.sort, pix.static, pix.xfade

Contains

pix.blend - Blend 2 textures with different modes such as average, difference, exclude, darken, screen, etc.
pix.blur - Add a focus- or tilt-blur effect, similar to instagram filter blur
pix.brcosa - Adjust brightness, contrast and saturation of a texture
pix.brightness - Adjust brightness of a texture
pix.chromakey - Chromakey a texture, outputting the same texture with a alphachannel for the keyed color
pix.contrast - Adjust contrast of a texture
pix.degrade - Downsample the resolution or the colordepth of the texture
pix.delay - Delay a texture an n-amount of frames
pix.displace - Displace a texture's pixel positions with the input of another texture
pix.duotone - Change a texture to two colors based on grayscale
pix.edgedetect - Detect edges in a texture and output a black/white texture only showing detected edges
pix.feedback - Create a feedback loop with different blending modes such as mix-max, mix-min, mix and additive
pix.filter - Apply various convolution filters such as dilate, emboss, laplace, sobel, etc.
pix.frame - Add a border surrounding the texture, adjust border width and color
pix.glitch - Displace the green component of a texture with a low resolution noise matrix. Adjust displace distance, variation and dimensions of noise (was pix.displace)
pix.grid - Generate a simple grid texture of lines
pix.noise - Add gpu noise to an image, adjust threshold, smoothing and add/subtraction from texture
pix.pong - Similar to the pong and pong~ objects, applying a fold, wrap or clip to a texture
pix.saturation - Adjust saturation of a texture
pix.shift - Shift the hue (color value) of a texture
pix.sort - Simple pixelsorting by comparing current pixel with an adjecent pixel in adjustable direction and output the higher hue value
pix.static - Output noise for the dimension of the incoming texture
pix.technicolor1 - A technicolor shader - results in a orange/brown tint
pix.technicolor2 - A technicolor shader - results in a white/purple tint
pix.technicolor3 - A technicolor shader - results in a red/yellow tint
pix.xfade - Similar to jit.xfade, linear interpolation between 2 textures

Sources

Technicolor pixel shaders ported from the original GLSL shaders by vade

http://001.vade.info

GPU Noise algorithm based on

http://byteblacksmith.com/improvements-to-the-canonical-one-liner-glsl-rand-for-opengl-es-2-0/

Duotone gen-code loosly based on Micron's patch

https://www.patreon.com/posts/easy-duotone-19824702

Install

Download zip

1. download zip
2. unzip and place in Max Searchpath (eg. MacOS ~/Documents/Max 8/Library)
3. restart Max8

Git clone

1. $ cd ~/Documents/Max\ 8/Library
2. $ git clone https://github.com/tmhglnd/gl-pix-shaders.git
3. restart Max8

To see overview of all objects

open pix-shaders-launch.maxpat

License

This software is licensed under:

The MIT License