GLAPI/glCopyBufferSubData

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glCopyBufferSubData
Core in version 4.6
Core since version 3.1

glCopyBufferSubData: copy part of the data store of a buffer object to the data store of another buffer object

Function Definition

 void glCopyBufferSubData(GLenum readtarget​, GLenum writetarget​, GLintptr readoffset​, GLintptr writeoffset​, GLsizeiptr size​);
readtarget
Specifies the target from whose data store data should be read.
writetarget
Specifies the target to whose data store data should be written.
readoffset
Specifies the offset, in basic machine units, within the data store of readtarget​ from which data should be read.
writeoffset
Specifies the offset, in basic machine units, within the data store of writetarget​ to which data should be written.
size
Specifies the size, in basic machine units, of the data to be copied from readtarget​ to writetarget​.

Description

glCopyBufferSubData copies part of the data store attached to readtarget​ to the data store attached to writetarget​. The number of basic machine units indicated by size​ is copied from the source, at offset readoffset​ to the destination at writeoffset​, also in basic machine units.

readtarget​ and writetarget​ must be GL_ARRAY_BUFFER, GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, GL_ELEMENT_ARRAY_BUFFER, GL_PIXEL_PACK_BUFFER, GL_PIXEL_UNPACK_BUFFER, GL_TEXTURE_BUFFER, GL_TRANSFORM_FEEDBACK_BUFFER or GL_UNIFORM_BUFFER. Any of these targets may be used, although the targets GL_COPY_READ_BUFFER and GL_COPY_WRITE_BUFFER are provided specifically to allow copies between buffers without disturbing other GL state.

readoffset​, writeoffset​ and size​ must all be greater than or equal to zero. Furthermore, readoffset​ + size​ must not exceeed the size of the buffer object bound to readtarget​, and readoffset​ + size​ must not exceeed the size of the buffer bound to writetarget​. If the same buffer object is bound to both readtarget​ and writetarget​, then the ranges specified by readoffset​, writeoffset​ and size​ must not overlap.

Notes

glCopyBufferSubData is available only if the GL version is 3.1 or greater.

Errors

GL_INVALID_VALUE is generated if any of readoffset​, writeoffset​ or size​ is negative, if readoffset​ + size​ exceeds the size of the buffer object bound to readtarget​ or if writeoffset​ + size​ exceeds the size of the buffer object bound to writetarget​.

GL_INVALID_VALUE is generated if the same buffer object is bound to both readtarget​ and writetarget​ and the ranges [readoffset​, readoffset​ + size​) and [writeoffset​, writeoffset​ + size​) overlap.

GL_INVALID_OPERATION is generated if zero is bound to readtarget​ or writetarget​.

GL_INVALID_OPERATION is generated if the buffer object bound to either readtarget​ or writetarget​ is mapped.

See Also

glGenBuffers, glBindBuffer, glBufferData, glBufferSubData, glGetBufferSubData

Copyright

Copyright © 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.