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WebGL2RenderingContext: texSubImage3D() method

The WebGL2RenderingContext.texSubImage3D() method of the WebGL API specifies a sub-rectangle of the current texture.

Syntax

texSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, pixels)
texSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, offset)
texSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, srcData)
texSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, srcData, srcOffset)

Parameters

target

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

gl.TEXTURE_3D: A three-dimensional texture.
gl.TEXTURE_2D_ARRAY: A two-dimensional array texture.

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.

xoffset

A GLint specifying the x offset within the texture image.

yoffset

A GLint specifying the y offset within the texture image.

zoffset

A GLint specifying the z offset within the texture image.

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.

format

A GLenum specifying the format of the texel data. Possible values:

gl.ALPHA: Discards the red, green and blue components and reads the alpha component.
gl.RGB: Discards the alpha components and reads the red, green and blue components.
gl.RGBA: Red, green, blue and alpha components are read from the color buffer.
gl.LUMINANCE: Each color component is a luminance component, alpha is 1.0.
gl.LUMINANCE_ALPHA: Each component is a luminance/alpha component.
gl.R8
gl.R16F
gl.R32F
gl.R8UI
gl.RG8
gl.RG16F
gl.RG32F
gl.RGUI
gl.RGB8
gl.SRGB8
gl.RGB565
gl.R11F_G11F_B10F
gl.RGB9_E5
gl.RGB16F
gl.RGB32F
gl.RGB8UI
gl.RGBA8
gl.SRGB_ALPHA8
gl.RGB5_A1
gl.RGBA4444
gl.RGBA16F
gl.RGBA32F
gl.RGBA8UI

type

A GLenum specifying the data type of the texel data. Possible values:

gl.UNSIGNED_BYTE: 8 bits per channel for gl.RGBA
gl.UNSIGNED_SHORT_5_6_5: 5 red bits, 6 green bits, 5 blue bits.
gl.UNSIGNED_SHORT_4_4_4_4: 4 red bits, 4 green bits, 4 blue bits, 4 alpha bits.
gl.UNSIGNED_SHORT_5_5_5_1: 5 red bits, 5 green bits, 5 blue bits, 1 alpha bit.
gl.BYTE
gl.UNSIGNED_SHORT
gl.SHORT
gl.UNSIGNED_INT
gl.INT
gl.HALF_FLOAT
gl.FLOAT
gl.UNSIGNED_INT_2_10_10_10_REV
gl.UNSIGNED_INT_10F_11F_11F_REV
gl.UNSIGNED_INT_5_9_9_9_REV
gl.UNSIGNED_INT_24_8
gl.FLOAT_32_UNSIGNED_INT_24_8_REV (pixels must be null)

pixels

One of the following objects can be used as a pixel source for the texture:

Uint8Array (must be used if type is gl.UNSIGNED_BYTE)
Uint16Array (must be used if type is either gl.UNSIGNED_SHORT_5_6_5, gl.UNSIGNED_SHORT_4_4_4_4, gl.UNSIGNED_SHORT_5_5_5_1, or ext.HALF_FLOAT_OES)
Float32Array (must be used if type is gl.FLOAT)
ImageBitmap
ImageData
HTMLImageElement
HTMLCanvasElement
HTMLVideoElement

srcData

A TypedArray or a DataView object.

offset

A GLintptr byte offset into the WebGLBuffer's data store. Used to upload data to the currently bound WebGLTexture from the WebGLBuffer bound to the PIXEL_UNPACK_BUFFER target.

Return value

None (undefined).

Examples

gl.texSubImage3D(
  gl.TEXTURE_3D,
  0,
  0,
  0,
  0,
  image.width,
  image.height,
  1,
  gl.RGBA,
  gl.UNSIGNED_BYTE,
  image,
);

Specifications

Specification
WebGL 2.0 Specification # 3.7.6

Browser compatibility