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//	GLSL / ISF "cheat sheet"


Some of these are resources are designed to be read like a textbook, with examples and challenges along the way.
- The Book of Shaders (https://thebookofshaders.com/)
- Inigo Quilez articles (https://iquilezles.org/articles/)
- The ISF Reference and Primer (https://docs.isf.video/)
- Standard GLSL data types (https://www.khronos.org/opengl/wiki/Data_Type_(GLSL))

In general the GLSL community is very open when it comes to sharing code.

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This is based on the tips from,
http://hamelot.io/visualization/using-ffmpeg-to-convert-a-set-of-images-into-a-video/
and adapted it to this line to export to HAP directly from a tif sequence,
"ffmpeg -r 30 -f image2 -s 1920x1080 -i test%02d.tif -vcodec hap -pix_fmt rgba test.mov"
(without quotes of course)

- i is where you set the pattern for the image sequence naming,
(where the %02d means that zeros will be padded until the length of the string is 2 i.e 01…20…30… and so on. If no padding is needed use something similar to pic%d.png or %d.png)
-r is the framerate (fps)
-s is the resolution

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uniform sampler2D cocgsy_src;
uniform sampler2D alpha_src;

const vec4 offsets = vec4(-0.50196078431373, -0.50196078431373, 0.0, 0.0);

void main()
{
    vec4 CoCgSY = texture2D(cocgsy_src, gl_TexCoord[0].xy);
    vec4 theAlpha = texture2D(alpha_src, gl_TexCoord[0].xy);

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uniform sampler2D cocgsy_src;

const vec4 offsets = vec4(-0.50196078431373, -0.50196078431373, 0.0, 0.0);

void main()
{
    vec4 CoCgSY = texture2D(cocgsy_src, gl_TexCoord[0].xy);

    CoCgSY += offsets;

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Encoding to Hap from the command line using FFmpeg

For users who prefer working with a command line or need to access advanced encoding settings for Hap the popular FFmpeg library can be used to work with Hap movies.

1. If this is your first time using FFmpeg you may need to install it on your system, or compile it from source. In either case be sure that Snappy is enabled as part of the binary. If you already have FFmpeg on your system with Snappy enabled, you can skip this step.

   You can check that your version of FFmpeg can encode Hap using

   ffmpeg -encoders | grep hap
   

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amateur amateur (META)

I like the idea of being an amateur at something you just are, native, not like a vocation...amateur adult also fits in this category. how about amateur parent, amateur mammal, amateur bipedal creature 

or puns #duh: amature amateur *tweeting this*

oxymoronic or redundant ones are good too. ex: amateur demolitions expert; amateur waffle enthusiast, amateur hobbyist

amateur CERN fellow
amateur astronaut