Baseline Widely available
The WEBGL_compressed_texture_astc extension is part of the 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 Using Extensions in the WebGL tutorial.
Note: ASTC compression is typically available on Mali ARM GPUs, Intel GPUs, and NVIDIA Tegra chips.
This extension is available to both, WebGL1 and WebGL2 contexts.
Instance methodsThis extension exposes one new methods.
ext.getSupportedProfiles()
Returns an array of strings containing the names of the ASTC profiles supported by the implementation.
The compressed texture formats are exposed by 28 constants and can be used in two functions: compressedTexImage2D() and compressedTexSubImage2D().
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 Examples
const ext = gl.getExtension("WEBGL_compressed_texture_astc");
const 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,
);
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