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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/texImage3D below:

WebGL2RenderingContext: texImage3D() method - Web APIs

texImage3D(target, level, internalformat, width, height, depth, border, format, type, srcData)
texImage3D(target, level, internalformat, width, height, depth, border, format, type, srcData, srcOffset)
texImage3D(target, level, internalformat, width, height, depth, border, format, type, source)
texImage3D(target, level, internalformat, width, height, depth, border, format, type, offset)

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.

internalformat

A GLenum specifying how the texture should be stored after it's loaded.

width

A GLsizei specifying the width of the texture in texels.

height

A GLsizei specifying the height of the texture in texels.

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.

format

A GLenum specifying how each integer element in the raw texel data should be interpreted as color components.

type

A GLenum specifying the size of each integer element in the raw texel data.

The internalformat, format, and type values must be compatible with each other. For all valid combinations, see WebGLRenderingContext.texImage2D().

The texture source can be provided in one of three ways: from an ArrayBuffer (possibly shared) using srcData and srcOffset; from a DOM pixel source; or from gl.PIXEL_UNPACK_BUFFER using offset.

srcData

A TypedArray or DataView containing the compressed texture data. Its type must match the type parameter; see WebGLRenderingContext.texImage2D(). When type is FLOAT_32_UNSIGNED_INT_24_8_REV, srcData must be null.

srcOffset Optional

An integer specifying the index of srcData to start reading from. Defaults to 0.

source

Read from a DOM pixel source, which can be one of:

offset

A GLintptr specifying the starting address in the buffer bound to gl.PIXEL_UNPACK_BUFFER.

Return value

None (undefined).

Examples

gl.texImage3D(
  gl.TEXTURE_3D,
  0, // level
  gl.RGBA, // internalFormat
  1, // width
  1, // height
  1, // depth
  0, // border
  gl.RGBA, // format
  gl.UNSIGNED_BYTE, // type
  new Uint8Array([0xff, 0x00, 0x00, 0x00]),
); // data

Specifications Browser compatibility

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