EXT_texture_compression_rgtc

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常量
范例
规范
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EXT_texture_compression_rgtc 扩展属于 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 使用扩展在 WebGL 教程 .

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

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

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

	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
`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

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常量

范例

规范

浏览器兼容性

图例

另请参阅

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