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docs.GL

glBufferSubData

Name

glBufferSubData — updates a subset of a buffer object's data store

C Specification

void glBufferSubData( GLenum target,
  GLintptr offset,
  GLsizeiptr size,
  const void * data);
 

Parameters

target

Specifies the target to which the buffer object is bound for glBufferSubData, which must be one of the buffer binding targets in the following table:

Buffer Binding Target Purpose
GL_ARRAY_BUFFER Vertex attributes
GL_ATOMIC_COUNTER_BUFFER Atomic counter storage
GL_COPY_READ_BUFFER Buffer copy source
GL_COPY_WRITE_BUFFER Buffer copy destination
GL_DISPATCH_INDIRECT_BUFFER Indirect compute dispatch commands
GL_DRAW_INDIRECT_BUFFER Indirect command arguments
GL_ELEMENT_ARRAY_BUFFER Vertex array indices
GL_PIXEL_PACK_BUFFER Pixel read target
GL_PIXEL_UNPACK_BUFFER Texture data source
GL_SHADER_STORAGE_BUFFER Read-write storage for shaders
GL_TEXTURE_BUFFER Texture data buffer
GL_TRANSFORM_FEEDBACK_BUFFER Transform feedback buffer
GL_UNIFORM_BUFFER Uniform block storage
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 consistently 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.

The GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, GL_PIXEL_PACK_BUFFER,GL_PIXEL_UNPACK_READ_BUFFER, GL_TRANSFORM_FEEDBACK_BUFFER and GL_UNIFORM_BUFFER targets are available only if the GL ES version is 3.0 or greater.

The GL_ATOMIC_COUNTER_BUFFER, GL_DISPATCH_INDIRECT_BUFFER, GL_DRAW_INDIRECT_BUFFER and GL_SHADER_STORAGE_BUFFER targets are available only if the GL ES version is 3.1 or greater.

The GL_TEXTURE_BUFFER target is available only if the GL ES version is 3.2 or greater.

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.

API Version Support

OpenGL ES API Version
Function Name 2.0 3.0 3.1 3.2
glBufferSubData ✔ ✔ ✔ ✔
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