Compressed texture format for target build platform.
Additional resources: EditorUserBuildSettings.webGLBuildSubtarget.
| Generic | Don't override texture compression. |
| DXT | S3 texture compression. Supported on devices with NVidia Tegra, Vivante and Intel GPUs. |
| ETC2 | ETC2 texture compression. Available on devices which support OpenGL ES 3.0; on OpenGL ES 2 devices the texture is decompressed on CPU. |
| ASTC | ASTC texture compression. |