https://en.wikipedia.org/wiki/Shadertoy
https://www.shadertoy.com/view/XlBXRK
This is a fragment of GLSL (OpenGL Shading Language) code, which is used to create shaders for 3D graphics and effects. The code defines some uniform variables, which are used to pass data to the shader, such as:
- iResolution: the window resolution (in pixels)
- iTime: the shader playback time (in seconds)
- iTimeDelta: the rendering time (in seconds)
- iFrameRate: the shader frame rate
- iFrame: the shader playback frame
- iChannelTime: the channel playback time (in seconds)
- iChannelResolution: the channel resolution (in pixels)
- iMouse: the mouse pixel coordinates. xy: current (if pressing left button), zw: click
- iChannel0…3: the input channels. XX = 2D/Cube
- iDate: (year, month, day, time in seconds)
- iSampleRate: the sound sample rate (e.g. 44100)
The code also defines some functions and macros to calculate the distance, color, and normal of various 3D objects, such as crates, barrels, pillars, and lights. The code uses some noise and random functions to create some variation and texture. The code also uses some shadow and reflection techniques to create realistic lighting effects. The code has a comment at the beginning, which explains the author’s intention and credits another shader author for some functions. The code is incomplete, as it ends with a comma.