---
title: "glBlendColor(_:_:_:_:)"
framework: OpenGL ES
role: symbol
role_heading: Function
platforms: [iOS 3.0+, iPadOS 3.0+, Mac Catalyst 3.0+, tvOS 9.0+]
path: "opengles/glblendcolor(_:_:_:_:)"
---

# glBlendColor(_:_:_:_:)

## Declaration

```swift
func glBlendColor(_ red: GLfloat, _ green: GLfloat, _ blue: GLfloat, _ alpha: GLfloat)
```