Editing S3 Texture Compression (section)

== S3TC format comparison ==
{| class="wikitable" style="text-align:center;"
|-
! FOURCC
! DX 10/11 name
! Description
! Alpha premultiplied?
! Compression ratio
! Texture type
|-
| DXT1    || BC1 || 1-bit alpha / opaque || Yes || 6:1 (for 24-bit source image) || Simple non-alpha
|-
| DXT2    || BC2 || Explicit alpha || Yes || 4:1 || Sharp alpha
|-
| DXT3    || BC2 || Explicit alpha || No || 4:1 || Sharp alpha
|-
| DXT4    || BC3 || Interpolated alpha || Yes || 4:1 || Gradient alpha
|-
| DXT5    || BC3 || Interpolated alpha || No || 4:1 || Gradient alpha
|-
| {{N/A}} || BC4 || Interpolated greyscale || {{N/A}} || 2:1 || Gradient
|-
| {{N/A}} || BC5 || Interpolated two-channel || {{N/A}} || 2:1 || Gradient
|-
| {{N/A}} || BC6H|| Interpolated HDR (no alpha) || {{N/A}} || 6:1 || Gradient
|-
| {{N/A}} || BC7 || Interpolated alpha || ? || 4:1<!-- 3:1 if no alpha --> || Gradient
|}