glGetBufferParameter — return parameters of a buffer object
void glGetBufferParameteriv( | GLenum target, |
| GLenum value, | |
GLint * data); |
void glGetBufferParameteri64v( | GLenum target, |
| GLenum value, | |
GLint64 * data); |
void glGetNamedBufferParameteriv( | GLuint buffer, |
| GLenum pname, | |
GLint *params); |
void glGetNamedBufferParameteri64v( | GLuint buffer, |
| GLenum pname, | |
GLint64 *params); |
target Specifies the target to which the buffer object is bound for glGetBufferParameteriv and glGetBufferParameteri64v. 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 glGetNamedBufferParameteriv and glGetNamedBufferParameteri64v.
value Specifies the name of the buffer object parameter to query.
data Returns the requested parameter.
These functions return in data a selected parameter of the specified buffer object.
pname names a specific buffer object parameter, as follows:
GL_BUFFER_ACCESS params returns the access policy set while mapping the buffer object (the value of the access parameter enum passed to glMapBuffer). If the buffer was mapped with glMapBufferRange, the access policy is determined by translating the bits in that access parameter to one of the supported enums for glMapBuffer as described in the OpenGL Specification.
GL_BUFFER_ACCESS_FLAGS params returns the access policy set while mapping the buffer object (the value of the access parameter bitfield passed to glMapBufferRange). If the buffer was mapped with glMapBuffer, the access policy is determined by translating the enums in that access parameter to the corresponding bits for glMapBufferRange as described in the OpenGL Specification. The initial value is zero.
GL_BUFFER_IMMUTABLE_STORAGE params returns a boolean flag indicating whether the buffer object is immutable. The initial value is GL_FALSE.
GL_BUFFER_MAPPED params returns a flag indicating whether the buffer object is currently mapped. The initial value is GL_FALSE.
GL_BUFFER_MAP_LENGTH params returns the length of the mapping into the buffer object established with glMapBuffer*. The i64v versions of these queries should be used for this parameter. The initial value is zero.
GL_BUFFER_MAP_OFFSET params returns the offset of the mapping into the buffer object established with glMapBuffer*. The i64v versions of these queries should be used for this parameter. The initial value is zero.
GL_BUFFER_SIZE params returns the size of the buffer object, measured in bytes. The initial value is 0.
GL_BUFFER_STORAGE_FLAGS params returns a bitfield indicating the storage flags for the buffer object. If the buffer object is immutable, the value returned will be that specified when the data store was established with glBufferStorage. If the data store was established with glBufferData, the value will be GL_MAP_READ_BIT | GL_MAP_WRITE_BIT | GL_DYNAMIC_STORAGE_BIT | GL_MAP_WRITE_BIT. The initial value is zero.
GL_BUFFER_USAGE params returns the buffer object's usage pattern. The initial value is GL_STATIC_DRAW.
If an error is generated, no change is made to the contents of data.
The GL_ATOMIC_COUNTER_BUFFER target is available 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.
GL_INVALID_ENUM is generated by glGetBufferParameter* if target is not one of the accepted buffer targets.
GL_INVALID_OPERATION is generated by glGetBufferParameter* if zero is bound to target.
GL_INVALID_OPERATION is generated by glGetNamedBufferParameter* if buffer is not the name of an existing buffer object.
GL_INVALID_ENUM is generated if pname is not one of the buffer object parameter names described above.
| 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 |
glGetBufferParameteri64v | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
glGetBufferParameteriv | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
glGetNamedBufferParameteri64v | - | - | - | - | - | - | - | - | - | - | - | ✔ |
glGetNamedBufferParameteriv | - | - | - | - | - | - | - | - | - | - | - | ✔ |
glBindBuffer, glBufferData, glGetBufferPointerv, glMapBuffer, glUnmapBuffer
Copyright © 2005 Addison-Wesley. Copyright © 2010-2014 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. https://opencontent.org/openpub/.