---
title: GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
framework: OpenGL ES
role: symbol
role_heading: Global Variable
platforms: [iOS 2.0+, iPadOS 2.0+, Mac Catalyst 2.0+, tvOS 9.0+, visionOS 1.0+]
path: opengles/gl_compressed_srgb8_punchthrough_alpha1_etc2
---

# GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2

## Declaration

```swift
var GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2: Int32 { get }
```