GL_SGIX_async http://www.opengl.org/registry/specs/SGIX/async.txt GL_SGIX_async GL_ASYNC_MARKER_SGIX 0x8329 void glAsyncMarkerSGIX (GLuint marker) void glDeleteAsyncMarkersSGIX (GLuint marker, GLsizei range) GLint glFinishAsyncSGIX (GLuint* markerp) GLuint glGenAsyncMarkersSGIX (GLsizei range) GLboolean glIsAsyncMarkerSGIX (GLuint marker) GLint glPollAsyncSGIX (GLuint* markerp)