# ISF Reference Page

This reference contains a set of useful notes for writing GLSL shaders to meet the ISF Specification.

# Reference Pages

• Automatically Created Variables, Uniforms and Constants
• Built-In Functions
• Multi-Pass Shaders and Persistent Buffers
• ISF JSON Attributes
• Converting Non-ISF GLSL shaders to ISF
• Change Log

# Sample Files

• Here is a collection of simple test ISF files that demonstrate ISF's basic features. These are test filters, they aren't intended to have signifcant creative use: ISF Test/Tutorial filters
• The ISF Files Repository contains over 200 generator, transition and effects shaders that can be used as learning resources or bundled with applications as a standard set of assets. Note that these are installed by the ISF Editor and other apps to the "/Library/Graphics/ISF" directory on Mac and "/ProgramData/ISF" on Windows.

# Additional Resources

• Many of the standard GLSL variables and functions described in this reference are further discussed in The Book of Shaders Glossary section.
• The full ISF Specification Page contains detailed information for developers.