Graphics.GL.EXT.TransformFeedback
glGetEXTTransformFeedback
gl_EXT_transform_feedback
glBeginTransformFeedbackEXT
glBindBufferBaseEXT
glBindBufferOffsetEXT
glBindBufferRangeEXT
glEndTransformFeedbackEXT
glGetTransformFeedbackVaryingEXT
glTransformFeedbackVaryingsEXT