WEBGL_compressed_texture_astc

WEBGL_compressed_texture_astc 扩展属于 WebGL API and exposes Adaptive Scalable Texture Compression (ASTC) compressed texture formats to WebGL.

For more information, see the article Using ASTC Texture Compression for Game Assets by nvidia.

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： ASTC compression is typically available on Mali ARM GPUs, Intel GPUs, and Nividia Tegra chips.

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

方法

This extension exposes one new methods.

ext.getSupportedProfiles()

常量

The compressed texture formats are exposed by 28 constants and can be used in two functions: compressedTexImage2D() and compressedTexSubImage2D() .

常量	块	Bits per pixel	`ArrayBuffer` `byteLength`	bytes if height and width are 512
`ext.COMPRESSED_RGBA_ASTC_4x4_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR`	4x4	8.00	`floor((width + 3) / 4) * floor((height + 3) / 4) * 16`	262144
`ext.COMPRESSED_RGBA_ASTC_5x4_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR`	5x4	6.40	`floor((width + 4) / 5) * floor((height + 3) / 4) * 16`	210944
`ext.COMPRESSED_RGBA_ASTC_5x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR`	5x5	5.12	`floor((width + 4) / 5) * floor((height + 4) / 5) * 16`	169744
`ext.COMPRESSED_RGBA_ASTC_6x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR`	6x5	4.27	`floor((width + 5) / 6) * floor((height + 4) / 5) * 16`	141728
`ext.COMPRESSED_RGBA_ASTC_6x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR`	6x6	3.56	`floor((width + 5) / 6) * floor((height + 5) / 6) * 16`	118336
`ext.COMPRESSED_RGBA_ASTC_8x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR`	8x5	3.20	`floor((width + 7) / 8) * floor((height + 4) / 5) * 16`	105472
`ext.COMPRESSED_RGBA_ASTC_8x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR`	8x6	2.67	`floor((width + 7) / 8) * floor((height + 5) / 6) * 16`	88064
`ext.COMPRESSED_RGBA_ASTC_8x8_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR`	8x8	2.00	`floor((width + 7) / 8) * floor((height + 7) / 8) * 16`	65536
`ext.COMPRESSED_RGBA_ASTC_10x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR`	10x5	2.56	`floor((width + 9) / 10) * floor((height + 4) / 5) * 16`	85696
`ext.COMPRESSED_RGBA_ASTC_10x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR`	10x6	2.13	`floor((width + 9) / 10) * floor((height + 5) / 6) * 16`	71552
`ext.COMPRESSED_RGBA_ASTC_10x8_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR`	10x8	1.60	`floor((width + 9) / 10) * floor((height + 7) / 8) * 16`	53248
`ext.COMPRESSED_RGBA_ASTC_10x10_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR`	10x10	1.28	`floor((width + 9) / 10) * floor((height + 9) / 10) * 16`	43264
`ext.COMPRESSED_RGBA_ASTC_12x10_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR`	12x10	1.07	`floor((width + 11) / 12) * floor((height + 9) / 10) * 16`	35776
`ext.COMPRESSED_RGBA_ASTC_12x12_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR`	12x12	0.89	`floor((width + 11) / 12) * floor((height + 11) / 12) * 16`	29584

范例

var ext = gl.getExtension('WEBGL_compressed_texture_astc');
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RGBA_ASTC_12x12_KHR, 512, 512, 0, textureData);

规范

规范	状态	注释
WEBGL_compressed_texture_astc The definition of 'WEBGL_compressed_texture_astc' in that specification.	推荐	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_astc`	Chrome 47	Edge 79	Firefox 53	IE ?	Opera ?	Safari ?	WebView Android 47	Chrome Android 47	Firefox Android 53	Opera Android ?	Safari iOS ?	Samsung Internet Android 5.0
`getSupportedProfiles`	Chrome 47	Edge 79	Firefox 53	IE ?	Opera ?	Safari ?	WebView Android 47	Chrome Android 47	Firefox Android 53	Opera Android ?	Safari iOS ?	Samsung Internet Android 5.0

方法

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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