---
title: prepareToDraw()
framework: GLKit
role: symbol
role_heading: Instance Method
platforms: [iOS 5.0+, iPadOS 5.0+, macOS 10.8+, tvOS 9.0+]
path: glkit/glkskyboxeffect/preparetodraw()
---

# prepareToDraw()

Prepares an effect for rendering.

## Declaration

```swift
func prepareToDraw()
```

## Discussion

Discussion When the skybox shader is bound, the following state variables are altered: GL_CURRENT_PROGRAM GL_TEXTURE_BINDING_CUBE_MAP GL_VERTEX_ARRAY_BINDING_OES GL_VERTEX_ATTRIB_ARRAY_ENABLED Your application is responsible for saving and restoring these variables, if necessary for it to execute correctly.