WebGLRenderingContext.compressedTexImage[23]D()
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 forcompressedTexImage2D
: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 forcompressedTexImage2D
. See compressed texture formats for which are valid forcompressedTexImage3D
. 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
- When using the
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 aTEXTURE_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 togl.PIXEL_UNPACK_BUFFER
. offset
-
A
GLintptr
specifying the offset in bytes from which to read from the buffer bound togl.PIXEL_UNPACK_BUFFER
. pixels
-
An
ArrayBufferView
that will 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 |
---|
WebGL Specification # COMPRESSEDTEXIMAGE2D |
Browser compatibility
compressedTexImage2D
BCD tables only load in the browser
compressedTexImage3D
BCD tables only load in the browser
See also
- Using WebGL extensions
WebGLRenderingContext.compressedTexSubImage2D()
WEBGL_compressed_texture_s3tc
WEBGL_compressed_texture_s3tc_srgb
WEBGL_compressed_texture_etc
WEBGL_compressed_texture_pvrtc
WEBGL_compressed_texture_etc1
WEBGL_compressed_texture_astc
EXT_texture_compression_bptc
EXT_texture_compression_rgtc