Texture Compression Types.
ETC1 can be used for universal BAR files or PVRTC and ATC can be used for targeting specific hardware.
| Generic | Don't override texture compression. |
| PVRTC | PowerVR texture compression. Available on BlackBerry devices running PowerVR GPU's. |
| ATC | ATI texture compression. Available on BlackBerry devices running Adreno GPU. |
| ETC | ETC1 texture compression (or RGBA16 for textures with alpha), supported by all devices. |