An object that allows you to apply a custom fragment shader.
- iOS 8.0+
- macOS 10.10+
- tvOS 9.0+
- watchOS 2.0+
SKShader object holds a custom OpenGL ES fragment shader. Shader objects are used to customize the drawing behavior of many different kinds of nodes in SpriteKit.
To use a custom shader, create an
SKShader object and provide the source for the custom fragment shader. If your shader needs to provide uniform data to the shader, create one or more
SKUniform objects and associate them with the shader object. If your shader needs to provide per-node data to the shader, create one or more
SKAttribute objects and associate them with the relevant nodes. Then, assign the shader object to the
shader property of any sprites that need the custom behavior.
Compiling a shader and the uniform data associated with it can be expensive. Because of this, you should:
Initialize shader objects when your game launches, not while the game is running.
Avoid changing the shader’s source or changing the list of uniforms or attributes while your game is running. Either of these things recompiles the shader.
Share shader objects whenever possible. If multiple sprites need the same behavior, create one shader object and associate it with every sprite that needs that behavior. Do not create a separate shader for each sprite.