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docs.GL

glUnmapBuffer

Name

glUnmapBuffer, glUnmapNamedBuffer — release the mapping of a buffer object's data store into the client's address space

C Specification

GLboolean glUnmapBuffer( GLenum target);
GLboolean glUnmapNamedBuffer( GLuint buffer);

Parameters

target

Specifies the target to which the buffer object is bound for glUnmapBuffer, 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_QUERY_BUFFER Query result buffer
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
buffer

Specifies the name of the buffer object for glUnmapNamedBuffer.

Description

glUnmapBuffer and glUnmapNamedBuffer unmap (release) any mapping of a specified buffer object into the client's address space (see glMapBufferRange and glMapBuffer).

If a mapping is not unmapped before the corresponding buffer object's data store is used by the GL, an error will be generated by any GL command that attempts to dereference the buffer object's data store, unless the buffer was successfully mapped with GL_MAP_PERSISTENT_BIT (see glMapBufferRange). When a data store is unmapped, the mapped pointer becomes invalid.

glUnmapBuffer returns GL_TRUE unless the data store contents have become corrupt during the time the data store was mapped. This can occur for system-specific reasons that affect the availability of graphics memory, such as screen mode changes. In such situations, GL_FALSE is returned and the data store contents are undefined. An application must detect this rare condition and reinitialize the data store.

A buffer object's mapped data store is automatically unmapped when the buffer object is deleted or its data store is recreated with glBufferData).

Notes

If an error is generated, glUnmapBuffer returns GL_FALSE.

The GL_ATOMIC_COUNTER_BUFFER target is accepted only if the GL version is 4.2 or greater.

The GL_DISPATCH_INDIRECT_BUFFER and GL_SHADER_STORAGE_BUFFER targets are available only if the GL version is 4.3 or greater.

The GL_QUERY_BUFFER target is available only if the GL version is 4.4 or greater.

Errors

GL_INVALID_ENUM is generated by glUnmapBuffer if target is not one of the buffer binding targets listed above.

GL_INVALID_OPERATION is generated by glUnmapBuffer if zero is bound to target.

GL_INVALID_OPERATION is generated by glUnmapNamedBuffer if buffer is not the name of an existing buffer object.

GL_INVALID_OPERATION is generated if the buffer object is not in a mapped state.

Associated Gets

glGetBufferParameter with argument GL_BUFFER_MAPPED.

Tutorials

Version Support

OpenGL Version
Function / Feature Name 2.0 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5
glUnmapBuffer ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
glUnmapNamedBuffer - - - - - - - - - - - ✔
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