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► Shader Inputs

uniform vec3      iResolution;            // viewport resolution (in pixels)         
uniform float     iTime;                  // shader playback time (in seconds)       
uniform float     iTimeDelta;             // time since last frame (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;                 // xy: mouse coords zw: click              
uniform sampler2D iChannel0;              // input channel 0                         
uniform sampler2D iChannel1;              // input channel 1                         
uniform sampler2D iChannel2;              // input channel 2                         
uniform sampler2D iChannel3;              // input channel 3                         
uniform vec4      iDate;                  // year, month, day, unixtime              
uniform float     iSampleRate;            // sound sample rate (i.e., 44100)                     
uniform float      mtTime;            // position within song; seconds
uniform float      mtTimeDelta;       // time change since last frame; 0 == paused
uniform sampler2D  mtSongVelocities;  // time slices x 128 MIDI pitches; velocity
uniform usampler2D mtSongChannels;    // time slices x 128 MIDI pitches; 16-bit channel mask
uniform float      mtSongSliceRate;   // time slices per second; typically 30.0
uniform ivec2      mtSongTextureSize; // texture size in texels
uniform float      mtSecondsVisible;  // visible note-window height in seconds; upcoming notes
        

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