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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/compressedTexImage3D below:

WebGL2RenderingContext: compressedTexImage3D() method - Web APIs

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Note: This feature is available in Web Workers.

The compressedTexImage3D() method of the WebGL2RenderingContext interface of the WebGL API specifies a three-dimensional texture image in a compressed format.

Compressed image formats must be enabled by WebGL extensions before using these methods.

// read from buffer bound to gl.PIXEL_UNPACK_BUFFER
compressedTexImage3D(target, level, internalformat, width, height, depth, border, imageSize, offset)

compressedTexImage3D(target, level, internalformat, width, height, depth, border, srcData)
compressedTexImage3D(target, level, internalformat, width, height, depth, border, srcData, srcOffset)
compressedTexImage3D(target, level, internalformat, width, height, depth, border, srcData, srcOffset, srcLengthOverride)

target

A GLenum specifying the binding point (target) of the active texture. Possible values for compressedTexImage3D:

• gl.TEXTURE_2D_ARRAY
• gl.TEXTURE_3D

level

A GLint specifying the level of detail. Level 0 is the base image level and level n is the n-th mipmap reduction level.

internalformat

A GLenum specifying the compressed image format. Compressed image formats must be enabled by WebGL extensions before using this method. See compressed texture formats for which are valid for compressedTexImage3D. Possible values:

• When using the WEBGL_compressed_texture_s3tc extension:

  • ext.COMPRESSED_RGB_S3TC_DXT1_EXT
  • ext.COMPRESSED_RGBA_S3TC_DXT1_EXT
  • ext.COMPRESSED_RGBA_S3TC_DXT3_EXT
  • ext.COMPRESSED_RGBA_S3TC_DXT5_EXT

• When using the WEBGL_compressed_texture_s3tc_srgb extension:

  • ext.COMPRESSED_SRGB_S3TC_DXT1_EXT
  • ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
  • ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
  • ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT

• When using the WEBGL_compressed_texture_etc extension:

  • ext.COMPRESSED_R11_EAC
  • ext.COMPRESSED_SIGNED_R11_EAC
  • ext.COMPRESSED_RG11_EAC
  • ext.COMPRESSED_SIGNED_RG11_EAC
  • ext.COMPRESSED_RGB8_ETC2
  • ext.COMPRESSED_RGBA8_ETC2_EAC
  • ext.COMPRESSED_SRGB8_ETC2
  • ext.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
  • ext.COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
  • ext.COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2

• When using the WEBGL_compressed_texture_pvrtc extension:

  • ext.COMPRESSED_RGB_PVRTC_4BPPV1_IMG
  • ext.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG
  • ext.COMPRESSED_RGB_PVRTC_2BPPV1_IMG
  • ext.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG

• When using the WEBGL_compressed_texture_etc1 extension:

  • ext.COMPRESSED_RGB_ETC1_WEBGL

• When using the WEBGL_compressed_texture_astc extension:

  • ext.COMPRESSED_RGBA_ASTC_4x4_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR
  • ext.COMPRESSED_RGBA_ASTC_5x4_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR
  • ext.COMPRESSED_RGBA_ASTC_5x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR
  • ext.COMPRESSED_RGBA_ASTC_6x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR
  • ext.COMPRESSED_RGBA_ASTC_6x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR
  • ext.COMPRESSED_RGBA_ASTC_8x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR
  • ext.COMPRESSED_RGBA_ASTC_8x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR
  • ext.COMPRESSED_RGBA_ASTC_8x8_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR
  • ext.COMPRESSED_RGBA_ASTC_10x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR
  • ext.COMPRESSED_RGBA_ASTC_10x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR
  • ext.COMPRESSED_RGBA_ASTC_10x10_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR
  • ext.COMPRESSED_RGBA_ASTC_12x10_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR
  • ext.COMPRESSED_RGBA_ASTC_12x12_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR

• When using the EXT_texture_compression_bptc extension:

  • ext.COMPRESSED_RGBA_BPTC_UNORM_EXT
  • ext.COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT
  • ext.COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT
  • ext.COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT

• When using the EXT_texture_compression_rgtc extension:

  • ext.COMPRESSED_RED_RGTC1_EXT
  • ext.COMPRESSED_SIGNED_RED_RGTC1_EXT
  • ext.COMPRESSED_RED_GREEN_RGTC2_EXT
  • ext.COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT

width

A GLsizei specifying the width of the texture.

height

A GLsizei specifying the height of the texture.

depth

A GLsizei specifying the depth of the texture/the number of textures in a TEXTURE_2D_ARRAY.

border

A GLint specifying the width of the border. Must be 0.

imageSize

A GLsizei specifying the number of bytes to read from the buffer bound to gl.PIXEL_UNPACK_BUFFER.

offset

A GLintptr specifying the offset in bytes from which to read from the buffer bound to gl.PIXEL_UNPACK_BUFFER.

None (undefined).

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