GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
version(Android)
extern (C) @system nothrow @nogc
enum GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2 = 0x9277;

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