man glGetBufferParameteriv (3): return parameters of a buffer object

C SPECIFICATION

void glGetBufferParameteriv(GLenum target, GLenum value, GLint * data);

PARAMETERS

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_TEXTURE_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, GL_BUFFER_MAPPED, GL_BUFFER_SIZE, or GL_BUFFER_USAGE.

data

: Returns the requested parameter.

DESCRIPTION

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.

NOTES

If an error is generated, no change is made to the contents of data.

ERRORS

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.

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