GL_NV_conditional_render
http://www.opengl.org/registry/specs/NV/conditional_render.txt
GL_NV_conditional_render
GL_QUERY_WAIT_NV 0x8E13
GL_QUERY_NO_WAIT_NV 0x8E14
GL_QUERY_BY_REGION_WAIT_NV 0x8E15
GL_QUERY_BY_REGION_NO_WAIT_NV 0x8E16
void glBeginConditionalRenderNV (GLuint id, GLenum mode)
void glEndConditionalRenderNV (void)