EXT_texture_compression_s3tc extends ARB_texture_compression and provides support for four specific compressed formats: RGB_DXT1_S3TC (the same as GL_S3TC_RGB in S3_s3tc), RGBA_DXT1_S3TC, RGBA_DXT3_S3TC and RGBA_DXT5_S3TC.
The S3_s3tc extension is still supported by the Radeon® driver, although it provides identical compression to the RGB_DXT1_S3TC format using the ARB_texture_compression and EXT_texture_compression_s3tc extensions.
For complete details, see the EXT_texture_compression_s3tc spec.
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