WEBGL_compressed_texture_etc

在此页

常量
范例
规范
浏览器兼容性
Compatibility notes
另请参阅
相关话题

WEBGL_compressed_texture_etc 扩展属于 WebGL API and exposes 10 ETC/EAC compressed texture formats .

Compressed textures reduce the amount of memory needed to store a texture on the GPU, allowing for higher resolution textures or more of the same resolution textures.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also 使用扩展在 WebGL 教程 .

可用性： This extension is available to both, WebGL1 and WebGL2 上下文。

常量

The compressed texture formats are exposed by 10 constants and can be used in two functions: compressedTexImage2D() and compressedTexSubImage2D() .

ext.COMPRESSED_R11_EAC
ext.COMPRESSED_SIGNED_R11_EAC
ext.COMPRESSED_RG11_EAC
ext.COMPRESSED_SIGNED_RG11_EAC
ext.COMPRESSED_RGB8_ETC2
ext.COMPRESSED_RGBA8_ETC2_EAC: Compresses RGBA8 data. The RGB part is encoded the same as RGB_ETC2 , but the alpha part is encoded separately.
ext.COMPRESSED_SRGB8_ETC2
ext.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC: Compresses sRGBA8 data. The sRGB part is encoded the same as SRGB_ETC2 , but the alpha part is encoded separately.
ext.COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2: 类似于 RGB8_ETC , but with ability to punch through the alpha channel, which means to make it completely opaque or transparent.
ext.COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2: 类似于 SRGB8_ETC , but with ability to punch through the alpha channel, which means to make it completely opaque or transparent.

范例

var ext = gl.getExtension('WEBGL_compressed_texture_etc');
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RGBA8_ETC2_EAC, 512, 512, 0, textureData);

规范

规范	状态	注释
WEBGL_compressed_texture_etc The definition of 'WEBGL_compressed_texture_etc' in that specification.	草案	初始定义。

浏览器兼容性

更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`WEBGL_compressed_texture_etc`	Chrome Yes	Edge 79	Firefox 51	IE ?	Opera Yes	Safari ?	WebView Android Yes	Chrome Android Yes	Firefox Android ?	Opera Android Yes	Safari iOS ?	Samsung Internet Android Yes

图例

完整支持
兼容性未知 ?

Compatibility notes

This extension was named WEBGL_compressed_texture_es3 from Firefox 46 to Firefox 51 and used to be available on the WebGL 2 context by default – this is not the case anymore. You have to enable it on both, WebGL 1 and WebGL 2 contexts, in order to use it.

另请参阅

元数据

最后修改： 2019 年 3 月 23 日

在此页

常量

范例

规范

浏览器兼容性

图例

Compatibility notes

另请参阅

相关话题