glGetBufferParameter — return parameters of a buffer object
void glGetBufferParameteriv( | GLenum target, |
| GLenum value, | |
GLint * data); |
void glGetBufferParameteri64v( | GLenum target, |
| GLenum value, | |
GLint64 * data); |
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_TRANSFORM_FEEDBACK_BUFFER, or GL_UNIFORM_BUFFER.
value Specifies the symbolic name of a buffer object parameter. Accepted values are GL_BUFFER_ACCESS_FLAGS, GL_BUFFER_MAPPED, GL_BUFFER_MAP_LENGTH, GL_BUFFER_MAP_OFFSET, GL_BUFFER_SIZE, or GL_BUFFER_USAGE.
data Returns the requested parameter.
glGetBufferParameteriv and glGetBufferParameteri64v return in data a selected parameter of the buffer object specified by target.
value names a specific buffer object parameter, as follows:
GL_BUFFER_ACCESS_FLAGS params returns the access policy set while mapping the buffer object.
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 buffer object mapping, measured in bytes. The initial value is 0.
GL_BUFFER_MAP_OFFSET params returns the offset (start) of the buffer object mapping, measured in bytes. The initial value is 0.
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.
If an error is generated, no change is made to the contents of data.
If glGetBufferParameteriv is used to query a value of GL_BUFFER_SIZE, values greater than or equal to will be clamped to .
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_ENUM is generated if glGetBufferParameteri64v is used to query a value of GL_BUFFER_ACCESS_FLAGS, GL_BUFFER_MAPPED or GL_BUFFER_USAGE.
GL_INVALID_ENUM is generated if glGetBufferParameteriv is used to query a value of GL_BUFFER_MAP_LENGTH or GL_BUFFER_MAP_OFFSET.
| OpenGL ES API Version | |||
|---|---|---|---|
| Function Name | 2.0 | 3.0 | 3.1 |
glGetBufferParameteriv | ✔ | ✔ | ✔ |
glGetBufferParameteri64v | - | ✔ | ✔ |
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