glgetbuffersubdata(3g) [debian man page]
GLGETBUFFERSUBDATA(3G) [FIXME: manual] GLGETBUFFERSUBDATA(3G) NAME
glGetBufferSubData - returns a subset of a buffer object's data store C SPECIFICATION
void glGetBufferSubData(GLenum target, GLintptr offset, GLsizeiptr size, GLvoid * data); PARAMETERS
target Specifies the target buffer object. The symbolic constant 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. offset Specifies the offset into the buffer object's data store from which data will be returned, measured in bytes. size Specifies the size in bytes of the data store region being returned. data Specifies a pointer to the location where buffer object data is returned. DESCRIPTION
glGetBufferSubData returns some or all of the data from the buffer object currently bound to target. Data starting at byte offset offset and extending for size bytes is copied from the data store to the memory pointed to by data. An error is thrown if the buffer object is currently mapped, or if offset and size together define a range beyond the bounds of the buffer object's data store. NOTES
If an error is generated, no change is made to the contents of data. ERRORS
GL_INVALID_ENUM is generated if target is not GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER, GL_PIXEL_PACK_BUFFER, or GL_PIXEL_UNPACK_BUFFER. GL_INVALID_VALUE is generated if offset or size is negative, or if together they define a region of memory that extends beyond the buffer object's allocated data store. GL_INVALID_OPERATION is generated if the reserved buffer object name 0 is bound to target. GL_INVALID_OPERATION is generated if the buffer object being queried is mapped. SEE ALSO
glBindBuffer(), glBufferData(), glBufferSubData(), glMapBuffer(), glUnmapBuffer() COPYRIGHT
Copyright (C) 2005 Addison-Wesley. 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/. [FIXME: source] 05/30/2012 GLGETBUFFERSUBDATA(3G)
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GLBUFFERSUBDATA(3G) OpenGL 3.3 GLBUFFERSUBDATA(3G) NAME
glBufferSubData - updates a subset of a buffer object's data store C SPECIFICATION
void glBufferSubData(GLenum target, GLintptr offset, GLsizeiptr size, const GLvoid * data); PARAMETERS
target Specifies the target buffer object. The symbolic constant 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. offset Specifies the offset into the buffer object's data store where data replacement will begin, measured in bytes. size Specifies the size in bytes of the data store region being replaced. data Specifies a pointer to the new data that will be copied into the data store. DESCRIPTION
glBufferSubData redefines some or all of the data store for the buffer object currently bound to target. Data starting at byte offset offset and extending for size bytes is copied to the data store from the memory pointed to by data. An error is thrown if offset and size together define a range beyond the bounds of the buffer object's data store. NOTES
When replacing the entire data store, consider using glBufferSubData rather than completely recreating the data store with glBufferData. This avoids the cost of reallocating the data store. Consider using multiple buffer objects to avoid stalling the rendering pipeline during data store updates. If any rendering in the pipeline makes reference to data in the buffer object being updated by glBufferSubData, especially from the specific region being updated, that rendering must drain from the pipeline before the data store can be updated. Clients must align data elements consistent with the requirements of the client platform, with an additional base-level requirement that an offset within a buffer to a datum comprising N bytes be a multiple of N. ERRORS
GL_INVALID_ENUM is generated if target is not one of the accepted buffer targets. GL_INVALID_VALUE is generated if offset or size is negative, or if together they define a region of memory that extends beyond the buffer object's allocated data store. GL_INVALID_OPERATION is generated if the reserved buffer object name 0 is bound to target. GL_INVALID_OPERATION is generated if the buffer object being updated is mapped. ASSOCIATED GETS
glGetBufferSubData() SEE ALSO
glBindBuffer(), glBufferData(), glMapBuffer(), glUnmapBuffer() COPYRIGHT
Copyright (C) 2005 Addison-Wesley. 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/. OpenGL 3.3 03/08/2011 GLBUFFERSUBDATA(3G)