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Shader Inputs 
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)

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iChannel0

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iChannel1

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iChannel2

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iChannel3
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GLSL Help
This help only covers the parts of GLSL ES that are relevant for Shadertoy. For the complete specification please have a look at GLSL ES specification

Language:

  • Version: WebGL 2.0
  • Arithmetic: ( ) + - ! * / %
  • Logical/Relatonal: ~ < > <= >= == != && ||
  • Bit Operators: & ^ | << >>
  • Comments: // /* */
  • Types: void bool int uint float vec2 vec3 vec4 bvec2 bvec3 bvec4 ivec2 ivec3 ivec4 uvec2 uvec3 uvec4 mat2 mat3 mat4 mat?x? sampler2D, sampler3D, samplerCube
  • Format: float a = 1.0; int b = 1; uint i = 1U; int i = 0x1;
  • Function Parameter Qualifiers: [none], in, out, inout
  • Global Variable Qualifiers: const
  • Vector Components: .xyzw .rgba .stpq
  • Flow Control: if else for return break continue switch/case
  • Output: vec4 fragColor
  • Input: vec2 fragCoord
  • Preprocessor: #define #undef #if #ifdef #ifndef #else #elif #endif #error #pragma #line

Built-in Functions:

  • ftype radians (ftype degrees)
  • ftype degrees (ftype radians)
  • ftype sin (ftype angle)
  • ftype cos (ftype angle)
  • ftype tan (ftype angle)
  • ftype asin (ftype x)
  • ftype acos (ftype x)
  • ftype atan (ftype y, ftype x)
  • ftype atan (ftype y_over_x)
  • ftype sinh (ftype x)
  • ftype cosh (ftype x)
  • ftype tanh (ftype x)
  • ftype asinh (ftype x)
  • ftype acosh (ftype x)
  • ftype atanh f(type x)
  • ftype pow (ftype x, ftype y)
  • ftype exp (ftype x)
  • ftype log (ftype x)
  • ftype exp2 (ftype x)
  • ftype log2 (ftype x)
  • ftype sqrt (ftype x)
  • ftype inversesqrt (ftype x)
  • type abs (type x)
  • type sign (type x)
  • ftype floor (ftype x)
  • ftype ceil (ftype x)
  • ftype trunc (type x)
  • ftype fract (ftype x)
  • ftype mod (ftype x, ftype y)
  • ftype modf (ftype x, out ftype i)
  • type min (type x, type y)
  • type max (type x, type y)
  • type clamp (type x, type minV, type maxV)
  • ftype mix (ftype x, ftype y, ftype a)
  • type step (type edge, type x)
  • ftype smoothstep (ftype a, ftype b, ftype x)
  • float length (vec x)
  • float distance (vec p0, vec p1)
  • float dot (vec x, vec y)
  • vec3 cross (vec3 x, vec3 y)
  • vec normalize (vec x)
  • vec faceforward (vec N, vec I, vec Nref)
  • vec reflect (vec I, vec N)
  • vec refract (vec I, vec N, float eta)
  • float determinant(mat? m)
  • mat?x? outerProduct(vec c, vec r)
  • mat?x? matrixCompMult (mat?x? x, mat?x? y)
  • mat? inverse (mat? inverse)
  • mat?x? transpose (mat?x? inverse)
  • vec4 texture( sampler , vec coord [, float bias])
  • vec4 textureLod( sampler, vec coord, float lod)
  • vec4 textureLodOffset( sampler sampler, vec coord, float lod, ivec offset)
  • vec4 textureGrad( sampler , vec coord, vec2 dPdx, vec2 dPdy)
  • vec4 textureGradOffset sampler , vec coord, vec dPdx, vec dPdy, vec offset)
  • vec4 textureProj( sampler , vec coord [, float bias])
  • vec4 textureProjLod( sampler , vec coord, float lod)
  • vec4 textureProjLodOffset( sampler , vec coord, float lod, vec? offset)
  • vec4 textureProjGrad( sampler , vec coord, vec2 dPdx, vec2 dPdy)
  • vec4 texelFetch( sampler , ivec coord, int lod)
  • vec4 texelFetchOffset( sampler, ivec coord, int lod, ivec offset )
  • ivec textureSize( sampler , int lod)
  • ftype dFdx (ftype x)
  • ftype dFdy (ftype x)
  • ftype fwidth (ftype p)
  • btype isnan (ftype x)
  • btype isinf (ftype x)
  • ftype intBitsToFloat (itype v)
  • ftype uintBitsToFloat (utype v)
  • itype floatBitsToInt (ftype v)
  • utype floatBitsToUint (ftype v)
  • uint packSnorm2x16 (vec2 v)
  • uint packUnorm2x16 (vec2 v)
  • vec2 unpackSnorm2x16 (uint p)
  • vec2 unpackUnorm2x16 (uint p)
  • bvec lessThan (vec x, vec y)
  • bvec lessThanEqual (vec x, vec y)
  • bvec greaterThan (vec x, vec y)
  • bvec greaterThanEqual (vec x, vec y)
  • bvec equal (type x, type y)
  • bvec notEqual (type x, type y)
  • bool any (bvec x)
  • bool all (bvec x)
  • bvec not (bvec x)

How-to

  • Use structs: struct myDataType { float occlusion; vec3 color; }; myDataType myData = myDataType(0.7, vec3(1.0, 2.0, 3.0));
  • Initialize arrays: float[] x = float[] (0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6);
  • Do conversions: int a = 3; float b = float(a);
  • Do component swizzling: vec4 a = vec4(1.0,2.0,3.0,4.0); vec4 b = a.zyyw;
  • Access matrix components: mat4 m; m[1] = vec4(2.0); m[0][0] = 1.0; m[2][3] = 2.0;

Be careful!

  • the f suffix for floating pont numbers: 1.0f is illegal in GLSL. You must use 1.0
  • saturate(): saturate(x) doesn't exist in GLSL. Use clamp(x,0.0,1.0) instead
  • pow/sqrt: please don't feed sqrt() and pow() with negative numbers. Add an abs() or max(0.0,) to the argument
  • mod: please don't do mod(x,0.0). This is undefined in some platforms
  • variables: initialize your variables! Don't assume they'll be set to zero by default
  • functions: don't call your functions the same name as any of your variables

Shadertoy Inputs

vec3iResolutionimage/bufferThe viewport resolution (z is pixel aspect ratio, usually 1.0)
floatiTimeimage/sound/bufferCurrent time in seconds
floatiTimeDeltaimage/bufferTime it takes to render a frame, in seconds
intiFrameimage/bufferCurrent frame
floatiFrameRateimage/bufferNumber of frames rendered per second
floatiChannelTime[4]image/bufferTime for channel (if video or sound), in seconds
vec3iChannelResolution[4]image/buffer/soundInput texture resolution for each channel
vec4iMouseimage/bufferxy = current pixel coords (if LMB is down). zw = click pixel
sampler2DiChannel{i}image/buffer/soundSampler for input textures i
vec4iDateimage/buffer/soundYear, month, day, time in seconds in .xyzw
floatiSampleRateimage/buffer/soundThe sound sample rate (typically 44100)

Shadertoy Outputs

Image shaders: fragColor is used as output channel. It is not, for now, mandatory but recommended to leave the alpha channel to 1.0.

Sound shaders: the mainSound() function returns a vec2 containing the left and right (stereo) sound channel wave data.


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