WebGLRenderingContext.compressedTexImage[23]D()

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The WebGLRenderingContext.compressedTexImage2D()  and WebGL2RenderingContext.compressedTexImage3D() methods of the WebGL API specify a two- or three-dimensional texture image in a compressed format.

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

Syntax

// WebGL 1:
void gl.compressedTexImage2D(target, level, internalformat, width, height, border, ArrayBufferView? pixels);

// Additionally available in WebGL 2: 
// read from buffer bound to gl.PIXEL_UNPACK_BUFFER
void gl.compressedTexImage2D(target, level, internalformat, width, height, border, GLsizei imageSize, GLintptr offset); 
void gl.compressedTexImage2D(target, level, internalformat, width, height, border,
                             ArrayBufferView srcData, optional srcOffset, optional srcLengthOverride);

 // read from buffer bound to gl.PIXEL_UNPACK_BUFFER
void gl.compressedTexImage3D(target, level, internalformat, width, height, depth, border, GLsizei imageSize, GLintptr offset); 
void gl.compressedTexImage3D(target, level, internalformat, width, height, depth, border, 
                             ArrayBufferView srcData, optional srcOffset, optional srcLengthOverride);

Parameters

target
A GLenum specifying the binding point (target) of the active texture. Possible values for compressedTexImage2D:
  • gl.TEXTURE_2D: A two-dimensional texture.
  • gl.TEXTURE_CUBE_MAP_POSITIVE_X: Positive X face for a cube-mapped texture.
  • gl.TEXTURE_CUBE_MAP_NEGATIVE_X: Negative X face for a cube-mapped texture.
  • gl.TEXTURE_CUBE_MAP_POSITIVE_Y: Positive Y face for a cube-mapped texture.
  • gl.TEXTURE_CUBE_MAP_NEGATIVE_Y: Negative Y face for a cube-mapped texture.
  • gl.TEXTURE_CUBE_MAP_POSITIVE_Z: Positive Z face for a cube-mapped texture.
  • gl.TEXTURE_CUBE_MAP_NEGATIVE_Z: Negative Z face for a cube-mapped 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 nth mipmap reduction level.
internalformat
A GLenum specifying the compressed image format. Compressed image formats must be enabled by WebGL extensions before using this method. All values are possible for compressedTexImage2D. 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_atc extension:
    • ext.COMPRESSED_RGB_ATC_WEBGL
    • ext.COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL
    • ext.COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_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.
pixels
An ArrayBufferView that be used as a data store for the compressed image data in memory.

Return value

None.

Examples

var ext = (
  gl.getExtension('WEBGL_compressed_texture_s3tc') ||
  gl.getExtension('MOZ_WEBGL_compressed_texture_s3tc') ||
  gl.getExtension('WEBKIT_WEBGL_compressed_texture_s3tc')
);

var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RGBA_S3TC_DXT5_EXT, 512, 512, 0, textureData); 
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);

Specifications

Specification Status Comment
WebGL 1.0
The definition of 'compressedTexImage2D' in that specification.
Recommendation Initial definition for WebGL.
OpenGL ES 2.0
The definition of 'glCompressedTexImage2D' in that specification.
Standard Man page of the (similar) OpenGL ES 2.0 API.
OpenGL ES 3.0
The definition of 'glCompressedTexImage2D' in that specification.
Standard Man page of the (similar) OpenGL ES 3.0 API.

Browser compatibility

compressedTexImage2D

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
compressedTexImage2DChrome Full support 9Edge Full support 12Firefox Full support 4IE Full support 11Opera Full support 12Safari Full support 5.1WebView Android Full support YesChrome Android Full support 25Edge Mobile Full support YesFirefox Android Full support YesOpera Android Full support 12Safari iOS Full support 8.1Samsung Internet Android Full support Yes
WebGL2Chrome Full support 56Edge No support NoFirefox Full support 51IE No support NoOpera Full support 43Safari No support NoWebView Android Full support 58Chrome Android Full support 58Edge Mobile No support NoFirefox Android Full support 51Opera Android Full support 43Safari iOS No support NoSamsung Internet Android Full support 7.0
SharedArrayBuffer as a parameterChrome Full support 60Edge ? Firefox ? IE ? Opera Full support 47Safari ? WebView Android Full support 60Chrome Android Full support 60Edge Mobile ? Firefox Android ? Opera Android Full support 47Safari iOS ? Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

compressedTexImage3D

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
compressedTexImage3DChrome Full support 56Edge No support NoFirefox Full support 51IE No support NoOpera Full support 43Safari No support NoWebView Android Full support 58Chrome Android Full support 58Edge Mobile No support NoFirefox Android Full support 51Opera Android Full support 43Safari iOS No support NoSamsung Internet Android Full support 7.0
SharedArrayBuffer as a parameterChrome Full support 60Edge No support NoFirefox ? IE No support NoOpera Full support 47Safari No support NoWebView Android Full support 60Chrome Android Full support 60Edge Mobile No support NoFirefox Android ? Opera Android Full support 47Safari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

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