uniform vec3      iResolution;           // viewport resolution (in pixels)

uniform float     iTime;                 // shader playback time (in seconds)

uniform float     iTimeDelta;            // render time (in seconds)

uniform float     iFrameRate;            // shader frame rate

uniform int       iFrame;                // shader playback frame

uniform float     iChannelTime[4];       // channel playback time (in seconds)

uniform vec3      iChannelResolution[4]; // channel resolution (in pixels)

uniform vec4      iMouse;                // mouse pixel coords. xy: current (if MLB down), zw: click

uniform samplerXX iChannel0..3;          // input channel. XX = 2D/Cube

uniform vec4      iDate;                 // (year, month, day, time in seconds)

uniform float     iSampleRate;           // sound sample rate (i.e., 44100)