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

WebGL2RenderingContext: texImage3D() method - Web APIs

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The WebGLRenderingContext.texImage3D() method of the WebGL API specifies a three-dimensional texture image.

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

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 GLint specifying the color components in the texture. 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.SRGB8_ALPHA8
• gl.RGB5_A1
• gl.RGBA4444
• gl.RGBA16F
• gl.RGBA32F
• gl.RGBA8UI

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.

border

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

format

A GLenum specifying the format of the texel data. The correct combinations with internalformat are listed in this table.

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)

source

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

• 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.

None (undefined).

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

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