|
glGetBufferParameteriv — return parameters of a buffer object
void glGetBufferParameteriv( | GLenum | target, |
GLenum | value, | |
GLint * | data) ; |
target
Specifies the target buffer object.
The symbolic constant must be GL_ARRAY_BUFFER
,
GL_ELEMENT_ARRAY_BUFFER
,
GL_PIXEL_PACK_BUFFER
, or
GL_PIXEL_UNPACK_BUFFER
.
value
Specifies the symbolic name of a buffer object parameter.
Accepted values are GL_BUFFER_ACCESS
, GL_BUFFER_MAPPED
,
GL_BUFFER_SIZE
, or GL_BUFFER_USAGE
.
data
Returns the requested parameter.
glGetBufferParameteriv
returns in data
a selected parameter of the buffer object
specified by target
.
value
names a specific buffer object parameter, as follows:
GL_BUFFER_ACCESS
params
returns the access policy set while mapping the buffer object.
The initial value is GL_READ_WRITE
.
GL_BUFFER_MAPPED
params
returns a flag indicating whether the buffer object is currently
mapped. The initial value is GL_FALSE
.
GL_BUFFER_SIZE
params
returns the size of the buffer object, measured in bytes.
The initial value is 0.
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
.
glGetBufferParameteriv
is available only if the GL version is 1.5 or greater.
Targets GL_PIXEL_PACK_BUFFER
and GL_PIXEL_UNPACK_BUFFER
are available
only if the GL version is 2.1 or greater.
GL_INVALID_ENUM
is generated if target
or value
is not an
accepted value.
GL_INVALID_OPERATION
is generated if the reserved buffer object name 0 is bound to target
.
GL_INVALID_OPERATION
is generated if glGetBufferParameteriv
is executed between the execution of glBegin
and the corresponding execution of glEnd.
Copyright © 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/.