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

WebGL2RenderingContext: getBufferSubData() method - Web APIs

Baseline Widely available *

Note: This feature is available in Web Workers.

The WebGL2RenderingContext.getBufferSubData() method of the WebGL 2 API reads data from a buffer binding point and writes them to an ArrayBuffer or SharedArrayBuffer.

getBufferSubData(target, srcByteOffset, dstData)
getBufferSubData(target, srcByteOffset, dstData, dstOffset)
getBufferSubData(target, srcByteOffset, dstData, dstOffset, length)

target

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

gl.ARRAY_BUFFER

Buffer containing vertex attributes, such as vertex coordinates, texture coordinate data, or vertex color data.

gl.ELEMENT_ARRAY_BUFFER

Buffer used for element indices.

gl.COPY_READ_BUFFER

Buffer for copying from one buffer object to another.

gl.COPY_WRITE_BUFFER

Buffer for copying from one buffer object to another.

gl.TRANSFORM_FEEDBACK_BUFFER

Buffer for transform feedback operations.

gl.UNIFORM_BUFFER

Buffer used for storing uniform blocks.

gl.PIXEL_PACK_BUFFER

Buffer used for pixel transfer operations.

gl.PIXEL_UNPACK_BUFFER

Buffer used for pixel transfer operations.

srcByteOffset

A GLintptr specifying the byte offset from which to start reading from the buffer.

dstData

A TypedArray or a DataView object to copy the data to. If dstData is a DataView then dstOffset and length are interpreted in bytes, otherwise dstData's element type is used.

dstOffset Optional

A GLuint specifying the element index offset to start writing in dstData.

length Optional

A GLuint specifying the number of elements to copy. If this is 0 or not specified, getBufferSubData will copy until the end of dstData.

None (undefined).

An INVALID_VALUE error is generated if:

• offset + returnedData.byteLength would extend beyond the end of the buffer
• returnedData is null
• offset is less than zero.

An INVALID_OPERATION error is generated if:

• zero is bound to target
• target is TRANSFORM_FEEDBACK_BUFFER, and any transform feedback object is currently active.

const buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);

const arrBuffer = new ArrayBuffer(
  vertices.length * Float32Array.BYTES_PER_ELEMENT,
);
gl.getBufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array(arrBuffer));

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