Cocos Creator can set the compression method required for textures directly in the editor, and then automatically compress the textures when the project is released. Multiple image formats can be exported at the same time, and the engine will automatically download the appropriate format according to different devices.
Configure compressed texture
Cocos Creator supports importing images in multiple formats (see the table below for details), but in an actual running game, we do not recommend using the original images as assets to load. For example, on a mobile platform, only 80% or less of the original image quality may be required, or a
.png without the transparent channel can be converted into a
.jpg, which can reduce the storage space required.
|Image format||Android||iOS||Mini Game||Web|
|WEBP||Native Supported for Android 4.0+
Other versions can use this library
|can use this library||Supported||Partially Supported|
|PVR||Not Supported||Supported||Supported iOS||Supported iOS|
|ETC1||Supported||Not Supported||Supported Android||Supported Android|
|ETC2||Partially Supported||Not Supported||Not Supported||Supported Android|
|ASTC||Partially Supported||Partially Supported||Not Supported (WeChat Mini Game v8.0.3 or above for iOS are supported.)||Partially Supported|
By default, Cocos Creator outputs the original image during build. If you need to compress an image during the build process, you can select this image in the Assets panel and then manage it in the Inspector to edit the compress texture format of the image.
presetId option defaults to the compression texture preset provided by Creator, and the image compression format shown here is read-only. To add more presets or edit them, click the Edit Presets button next to the
presetId to open the Project Settings -> Texture Compression panel for setting.
Note: after configuring texture compression, only images of the corresponding format will be generated at build time, if some image formats are not supported on some devices, it will cause abnormal display. To avoid this problem, when adding texture compression presets, please select additional general image formats (e.g. PNG, JPG) as default images.
The compress-texture options on the image asset will be stored in the asset's meta file.
PresetId is the ID of the selected compressed texture preset.
Detailed compression textures
When Cocos Creator 3.0 builds the image, it will find whether the current image has been already configured to use compressed textures. If not, it will output the original image.
If the configuration of the compressed texture is founded, the image will be compressed according to the configuration.The compress texture configuration in the project settings is divided into different platforms, and the support of in the actual platform is also difference. builder will make certain elimination and priority selection of the configured texture format according to the actual build platformand the current image texture transparency channel. You can refer to the following example to understand this rule.
Multiple texture formats can be specified on one platform, and each texture format is compressed to generate an image of the specified format when it is constructed.
These generated images will not all be loaded into the engine during runtime, the engine will choose to load the appropriate image according to the configuration in
macro.SUPPORT_TEXTURE_FORMATS enumerates all the image formats supported by the current platform. When the engine loads the images, it will find, from the generated images in this list, the format with the highest priority (that is, the order is higher) to load.
The user can customize the supported image assets for a platform and the priority of the loading order, by modifying
Example 1: As the compress presets of the MiniGame platform shown in the figure, if the build target is Huawei Quick Game That only runs on Android devices, Builder will not package the PVR texture format. For more details about the support of platforms, please refer to Details of compressed texture support for platforms
Example 2: In the example picture above, both ETC1 and PVR types are configured with RGB and RGBA two types of texture formats. In this case, Builder will be according to whether the current picture has a transparent channel to choose one of the same types of formats. The image asset in the example is with a transparent channel, then Builder will only pack a compressed texture format with REGA type. Of course, if there is only RGB picture format in the configuration, even if the current picture is with a transparent channel, it will be packaged normally.
Details of compressed texture support for platforms
Except for the
PNG supported by all platforms, the details of other formats are as follows:
|Web Mobile||ASTC / ETC2 / ETC1 / PVR / WEBP|
|WeChat Mini Game||ASTC / ETC1 / PVR|
|AliPay Mini Game||ETC1 / PVR|
|Baidu Mini Game||ETC1 / PVR|
|OPPO Mini Game||ETC1|
|vivo Mini Game||ETC1|
|Huawei Quick Game||ETC1|
|Xiaomi Quick Game||ETC1|
|iOS||ASTC / PVR / WEBP / ETC1 / ETC2|
|Android / Huawei AGC||ASTC / ETC2 / ETC1 / WEBP|
Custom build texture compression processing
Texture compression currently takes effect after the build, and the editor comes with a set of processing tools. To customize the compression tool, please refer to the Extending Build Process -- Custom Texture Compression documentation.