WEBGL_compressed_texture_s3tc

WEBGL_compressed_texture_s3tc extension is part of the WebGL API and exposes four S3TC 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 Using Extensions WebGL tutorial .

Availability: This extension is available to both, WebGL1 and WebGL2 contexts.

常量

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

ext.COMPRESSED_RGB_S3TC_DXT1_EXT
A DXT1-compressed image in an RGB image format.
ext.COMPRESSED_RGBA_S3TC_DXT1_EXT
A DXT1-compressed image in an RGB image format with a simple on/off alpha value.
ext.COMPRESSED_RGBA_S3TC_DXT3_EXT
A DXT3-compressed image in an RGBA image format. Compared to a 32-bit RGBA texture, it offers 4:1 compression.
ext.COMPRESSED_RGBA_S3TC_DXT5_EXT
A DXT5-compressed image in an RGBA image format. It also provides a 4:1 compression, but differs to the DXT3 compression in how the alpha compression is done.

范例

var ext = (
  gl.getExtension('WEBGL_compressed_texture_s3tc') ||
  gl.getExtension('MOZ_WEBGL_compressed_texture_s3tc') ||
  gl.getExtension('WEBKIT_WEBGL_compressed_texture_s3tc')
);
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RGBA_S3TC_DXT5_EXT, 512, 512, 0, textureData);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
					

规范

规范 状态 Comment
WEBGL_compressed_texture_s3tc
The definition of 'WEBGL_compressed_texture_s3tc' in that specification.
Recommendation 初始定义。

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
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_s3tc Chrome Yes
Yes
Yes
Prefixed
Prefixed Implemented with the vendor prefix: WEBKIT_
Edge ≤18 Firefox 22
22
不支持 15 — 58
Prefixed
Prefixed Implemented with the vendor prefix: MOZ_
IE ? Opera Yes
Yes
Yes
Prefixed
Prefixed Implemented with the vendor prefix: WEBKIT_
Safari ? WebView Android Yes
Yes
Yes
Prefixed
Prefixed Implemented with the vendor prefix: WEBKIT_
Chrome Android Yes
Yes
Yes
Prefixed
Prefixed Implemented with the vendor prefix: WEBKIT_
Firefox Android ? Opera Android Yes
Yes
Yes
Prefixed
Prefixed Implemented with the vendor prefix: WEBKIT_
Safari iOS ? Samsung Internet Android Yes
Yes
Yes
Prefixed
Prefixed Implemented with the vendor prefix: WEBKIT_

图例

完整支持
完整支持
兼容性未知
兼容性未知
要求使用供应商前缀或不同名称。
要求使用供应商前缀或不同名称。

另请参阅