This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The WebGL2RenderingContext.copyBufferSubData()
method of the WebGL 2 API copies part of the data of a buffer to another buffer.
Syntax
void gl.copyBufferSubData(readTarget, writeTarget, readOffset, writeOffset, size);
Parameters
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 fromreadTarget
towriteTarget
.
Return value
None.
Examples
var srcBuffer = gl.createBuffer(); var dstBuffer = gl.createBuffer(); var data = new Float32Array(vertices); var 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);
Specifications
Specification | Status | Comment |
---|---|---|
WebGL 2.0 The definition of 'copyBufferSubData' in that specification. |
Editor's Draft | Initial definition for WebGL. |
OpenGL ES 3.0 The definition of 'glCopyBufferSubData' in that specification. |
Standard | Man page of the (similar) OpenGL API. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
copyBufferSubData | Chrome Full support 56 | Edge Full support 79 | Firefox Full support 51 | IE No support No | Opera Full support 43 | Safari No support No | WebView Android Full support 58 | Chrome Android Full support 58 | Firefox Android Full support 51 | Opera Android Full support 43 | Safari iOS No support No | Samsung Internet Android Full support 7.0 |
Legend
- Full support
- Full support
- No support
- No support