Baseline Widely available
Note: This feature is available in Web Workers.
The WebGL2RenderingContext.copyBufferSubData() method of the WebGL 2 API copies part of the data of a buffer to another buffer.
copyBufferSubData(readTarget, writeTarget, readOffset, writeOffset, size)
readTarget, writeTarget
A GLenum specifying the binding point (target) from whose data store should be read or written. 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 (provided specifically for copy operations).gl.COPY_WRITE_BUFFER: Buffer for copying from one buffer object to another (provided specifically for copy operations).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.readOffset, writeOffset
A GLintptr specifying the byte offset from which to start reading from or writing to the buffer.
size
A GLsizei in bytes specifying the size of the data to be copied from readTarget to writeTarget.
None (undefined).
const srcBuffer = gl.createBuffer();
const dstBuffer = gl.createBuffer();
const data = new Float32Array(vertices);
const length = vertices.length * 4;
gl.bindBuffer(gl.ARRAY_BUFFER, srcBuffer);
gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
gl.bindBuffer(gl.COPY_READ_BUFFER, srcBuffer);
gl.bindBuffer(gl.ARRAY_BUFFER, dstBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(length), gl.STATIC_DRAW);
gl.copyBufferSubData(gl.COPY_READ_BUFFER, gl.ARRAY_BUFFER, 0, 0, length);
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