The WebGL2RenderingContext.copyBufferSubData()
method of the WebGL 2 API copies part of the data of a buffer to another buffer.
The WebGL2RenderingContext.copyBufferSubData()
method of the WebGL 2 API copies part of the data of a buffer to another buffer.
js
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
).
js
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);
Specification |
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WebGL 2.0 Specification # 3.7.3 |
Desktop | Mobile | |||||||||||
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Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
copyBufferSubData |
56 | 79 | 51 | No | 43 | 15 | 58 | 58 | 51 | 43 | 15 | 7.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/copyBufferSubData