fieldplay/API.md

List of variables available to shader

On top of standard glsl functions, the following list of variables can be used in velocity shader:

• float PI - 3.1415926535897932384626433832795
• float frame - Current frame number. Increases over time. Resets to 0 if you change shader's code
• vec4 cursor - Defines position of a cursor in bounding box coordinates. cursor.xy - position where mouse was clicked (or tapped) last time. cursor.zw - current mouse hover position. On mobile phones, where mouse is not available, zw component will be the xy of touchmove event.