GL_APPLE_fence http://www.opengl.org/registry/specs/APPLE/fence.txt GL_APPLE_fence GL_DRAW_PIXELS_APPLE 0x8A0A GL_FENCE_APPLE 0x8A0B void glDeleteFencesAPPLE (GLsizei n, const GLuint* fences) void glFinishFenceAPPLE (GLuint fence) void glFinishObjectAPPLE (GLenum object, GLint name) void glGenFencesAPPLE (GLsizei n, GLuint* fences) GLboolean glIsFenceAPPLE (GLuint fence) void glSetFenceAPPLE (GLuint fence) GLboolean glTestFenceAPPLE (GLuint fence) GLboolean glTestObjectAPPLE (GLenum object, GLuint name)