# shader(_:bounds:) Returns a shading instance that fills with the results of querying a shader for each pixel. ``` static func shader(_ shader: Shader, bounds: CGRect = .zero) -> GraphicsContext.Shading ``` ## Parameters `shader` The shader defining the filled colors. `bounds` The rect used to define any `bounds` arguments of the shader. ## Return Value A shading instance that fills using the shader. ## Discussion For a shader function to act as a shape fill it must have a function signature matching: ``` [[ stitchable ]] half4 name(float2 position, args...) ``` where `position` is the user-space coordinates of the pixel applied to the shader, and `args...` should be compatible with the uniform arguments bound to `shader`. The function should return the premultiplied color value in the color space of the destination (typically sRGB). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)