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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/WebGLRenderingContext/texSubImage2D below:

WebGLRenderingContext: texSubImage2D() method - Web APIs

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The WebGLRenderingContext.texSubImage2D() method of the WebGL API specifies a sub-rectangle of the current texture.

// WebGL1
texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, pixels) // pixels is a TypedArray or a DataView
texSubImage2D(target, level, xoffset, yoffset, format, type, pixels)

// WebGL2
texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, offset)
texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, source)
texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, pixels, srcOffset)

target

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

• 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.

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 lower left texel x coordinate of a width-wide by height-wide rectangular subregion of the texture array.

yoffset

A GLint specifying the lower left texel y coordinate of a width-wide by height-wide rectangular subregion of the texture array.

width

A GLsizei specifying the width of the texture in texels.

height

A GLsizei specifying the height of the texture in texels.

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.

When using the EXT_sRGB extension:

• ext.SRGB_EXT
• ext.SRGB_ALPHA_EXT

When using a WebGL 2 context, the following values are available additionally:

• gl.RED
• gl.RG
• gl.RED_INTEGER
• gl.RG_INTEGER
• gl.RGB_INTEGER
• gl.RGBA_INTEGER

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.

When using the OES_texture_float extension:

• gl.FLOAT

When using the OES_texture_half_float extension:

• gl.HALF_FLOAT_OES

When using a WebGL 2 context, the following values are available additionally:

• 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)
• ImageData,
• HTMLImageElement,
• HTMLCanvasElement,
• HTMLVideoElement,
• ImageBitmap.

offset

(WebGL 2 only) 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.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gl.RGBA, gl.UNSIGNED_BYTE, image);

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