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uniform vec3 iResolution; // viewport resolution (in pixels)
uniform float iGlobalTime; // shader playback time (in seconds)
uniform float iTimeDelta; // render time (in seconds)
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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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
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.
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:
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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 as some of your variables
Shadertoy Inputs
| vec3 | iResolution | image/buffer | The viewport resolution (z is pixel aspect ratio, usually 1.0) |
| float | iTime | image/sound/buffer | Current time in seconds |
| float | iTimeDelta | image/buffer | Time it takes to render a frame, in seconds |
| int | iFrame | image/buffer | Current frame |
| float | iFrameRate | image/buffer | Number of frames rendered per second |
| float | iChannelTime[4] | image/buffer | Time for channel (if video or sound), in seconds |
| vec3 | iChannelResolution[4] | image/buffer/sound | Input texture resolution for each channel |
| vec4 | iMouse | image/buffer | xy = current pixel coords (if LMB is down). zw = click pixel |
| sampler2D | iChannel{i} | image/buffer/sound | Sampler for input textures i |
| vec4 | iDate | image/buffer/sound | Year, month, day, time in seconds in .xyzw |
| float | iSampleRate | image/buffer/sound | The 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.
BBCode Help
Codes:
You can format your comments by using standard BBCode. The following tags are implemented in Shadertoy:
| Bold | [b]this text goes in bold[/b] | |
| Italic | [i]this text goes in italic[/i] | |
| Images | [img]url_to_image[/img] | |
| Url | [url]http://www.shadertoy.com[/url] | |
| Url | [url=http://www.shadertoy.com]Shadertoy[/url] | |
| Code | [code]fixed-width text[/code] | |
| Video | [video]http://www.youtube.com/watch?v=0ifChJ0nJfM[/video] |
Emoticons:
| :) |  | |
| :( |  | |
| :D |  | |
| :love: |  | |
| :octopus: |  | |
| :octopusballoon: |  |
Symbols:
| :alpha: | α | |
| :beta: | β | |
| :delta: | Δ | |
| :epsilon: | ε | |
| :nabla: | ∇ | |
| :square: | ² | |
| :cube: | ³ | |
| :limit: | ≐ |
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