GL_APPLE_sync http://www.opengl.org/registry/specs/APPLE/sync.txt GL_APPLE_sync GL_TIMEOUT_IGNORED_APPLE 0xFFFFFFFFFFFFFFFFull GL_SYNC_FLUSH_COMMANDS_BIT_APPLE 0x00000001 GL_SYNC_OBJECT_APPLE 0x8A53 GL_MAX_SERVER_WAIT_TIMEOUT_APPLE 0x9111 GL_OBJECT_TYPE_APPLE 0x9112 GL_SYNC_CONDITION_APPLE 0x9113 GL_SYNC_STATUS_APPLE 0x9114 GL_SYNC_FLAGS_APPLE 0x9115 GL_SYNC_FENCE_APPLE 0x9116 GL_SYNC_GPU_COMMANDS_COMPLETE_APPLE 0x9117 GL_UNSIGNALED_APPLE 0x9118 GL_SIGNALED_APPLE 0x9119 GL_ALREADY_SIGNALED_APPLE 0x911A GL_TIMEOUT_EXPIRED_APPLE 0x911B GL_CONDITION_SATISFIED_APPLE 0x911C GL_WAIT_FAILED_APPLE 0x911D GLenum glClientWaitSyncAPPLE (GLsync GLsync, GLbitfield flags, GLuint64 timeout) void glDeleteSyncAPPLE (GLsync GLsync) GLsync glFenceSyncAPPLE (GLenum condition, GLbitfield flags) void glGetInteger64vAPPLE (GLenum pname, GLint64* params) void glGetSyncivAPPLE (GLsync GLsync, GLenum pname, GLsizei bufSize, GLsizei* length, GLint *values) GLboolean glIsSyncAPPLE (GLsync GLsync) void glWaitSyncAPPLE (GLsync GLsync, GLbitfield flags, GLuint64 timeout)