Shadertoy Compatibility

Shader Studio is built around Shadertoy-style fragment shaders. Your shader must define a mainImage function:

void mainImage(out vec4 fragColor, in vec2 fragCoord) {
    // your shader code
}

Supported Uniforms

Uniform	Type	Description
iTime	float	Elapsed time in seconds
iTimeDelta	float	Time since last frame in seconds
iFrameRate	float	Frames per second
iFrame	int	Frame counter (starts at 0)
iMouse	vec4	Mouse position: xy = current, zw = click position
iResolution	vec3	Canvas dimensions: xy = width/height, z = 1.0
iChannel0–3	sampler2D	Input texture channels
iChannelResolution[4]	vec3[]	Resolution of each input channel
iChannelTime[4]	float[]	Playback time for each audio channel
iDate	vec4	Year, month, day, seconds since midnight
iSampleRate	float	Audio sample rate (44100)

Supported Input Types

Type	Description
Buffer	Output from another pass (BufferA–D)
Texture	Image files (jpg, png, etc.)
Video	Video files (webm, mp4, mov, avi)
Audio	Audio files (mp3, wav, ogg, etc.) — provides FFT and waveform data as a texture
Cubemap	Cross-layout cubemap images — bound as samplerCube
Keyboard	Key state input

Supported Passes

Pass	Description
Image	Main output pass (required)
BufferA–D	Up to 4 intermediate render passes
Common	Shared code included in all passes

Not Yet Supported

Feature	Notes
Webcam input	Live camera feed (planned)
Microphone input	Real-time audio from microphone
VR/AR	Immersive rendering modes

Porting from Shadertoy

Most Shadertoy shaders work without modification. Common adjustments:

• Multi-pass shaders need a .sha.json config to define buffer passes and channel bindings. Use Generate Config from the command palette.
• Textures referenced as iChannel0 need to be bound in the config file.
• Common code (shared functions) should use a Common pass in the config.
• Audio shaders bind an audio file as a channel input; the texture provides FFT (row 0) and waveform (row 1) data matching Shadertoy's layout.
• Cubemap shaders bind a T-cross cubemap image as a channel input, which becomes a samplerCube.