EXT_texture_compression_rgtc

EXT_texture_compression_rgtc extension is part of the WebGL API and exposes 4 RGTC compressed texture formats. RGTC is a block-based texture compression format suited for unsigned and signed red and red-green textures ( R ed- G reen T exture C ompression).

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions WebGL tutorial .

Availability: Support depends on the system's graphics driver. There is no support on Windows.

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

常量

The compressed texture formats are exposed by 4 constants and can be used in two functions: compressedTexImage2D() and compressedTexSubImage2D() .

ext.COMPRESSED_RED_RGTC1_EXT
Each 4x4 block of texels consists of 64 bits of unsigned red image data. See also BC4 unsigned .
ext.COMPRESSED_SIGNED_RED_RGTC1_EXT
Each 4x4 block of texels consists of 64 bits of signed red image data. See also BC4 signed .
ext.COMPRESSED_RED_GREEN_RGTC2_EXT
Each 4x4 block of texels consists of  64 bits of compressed unsigned red image data followed by 64 bits of compressed unsigned green image data. See also BC5 unsigned .
ext.COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT
Each 4x4 block of texels consists of 64 bits of compressed signed red image data followed by 64 bits of compressed signed green image data. See also BC5 signed .

范例

var ext = gl.getExtension('EXT_texture_compression_rgtc');
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RED_RGTC1_EXT, 128, 128, 0, textureData);
					

规范

规范 状态
EXT_texture_compression_rgtc Community Approved

浏览器兼容性

更新 GitHub 上的兼容性数据
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Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
EXT_texture_compression_rgtc Chrome No Edge No Firefox 65 IE No Opera No Safari No WebView Android No Chrome Android No Firefox Android No Opera Android No Safari iOS No Samsung Internet Android No

图例

完整支持
完整支持
不支持
不支持

另请参阅