EXT_texture_compression_bptc

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EXT_texture_compression_bptc 扩展属于 WebGL API and exposes 4 BPTC compressed texture formats. These compression formats are called BC7 and BC6H in Microsoft's DirectX API .

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_RGBA_BPTC_UNORM_EXT: Compresses 8-bit fixed-point data. Each 4x4 block of texels consists of 128 bits of RGBA or image data. See also BC7 format .
ext.COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT: Compresses 8-bit fixed-point data. Each 4x4 block of texels consists of 128 bits of SRGB_ALPHA or image data. See also BC7 format .
ext.COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT: Compresses high dynamic range signed floating point values. Each 4x4 block of texels consists of 128 bits of RGB data. It only contains RGB data, so the returned alpha value is 1.0. See also BC6H format .
ext.COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT: Compresses high dynamic range unsigned floating point values. Each 4x4 block of texels consists of 128 bits of RGB data. It only contains RGB data, so the returned alpha value is 1.0. See also BC6H format .

范例

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

规范

规范	状态
EXT_texture_compression_bptc	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_bptc`	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

元数据

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