Class NVFence

  • public class NVFence
    extends java.lang.Object
    Native bindings to the NV_fence extension.

    The goal of this extension is provide a finer granularity of synchronizing GL command completion than offered by standard OpenGL, which offers only two mechanisms for synchronization: Flush and Finish. Since Flush merely assures the user that the commands complete in a finite (though undetermined) amount of time, it is, thus, of only modest utility. Finish, on the other hand, stalls CPU execution until all pending GL commands have completed. This extension offers a middle ground - the ability to "finish" a subset of the command stream, and the ability to determine whether a given command has completed or not.

    This extension introduces the concept of a "fence" to the OpenGL command stream. Once the fence is inserted into the command stream, it can be queried for a given condition - typically, its completion. Moreover, the application may also request a partial Finish -- that is, all commands prior to the fence will be forced to complete until control is returned to the calling process. These new mechanisms allow for synchronization between the host CPU and the GPU, which may be accessing the same resources (typically memory).

    This extension is useful in conjunction with NV_vertex_array_range to determine when vertex information has been pulled from the vertex array range. Once a fence has been tested TRUE or finished, all vertex indices issued before the fence must have been pulled. This ensures that the vertex data memory corresponding to the issued vertex indices can be safely modified (assuming no other outstanding vertex indices are issued subsequent to the fence).

    • Method Detail

      • nglDeleteFencesNV

        public static void nglDeleteFencesNV​(int n,
                                             long fences)
      • glDeleteFencesNV

        public static void glDeleteFencesNV​(java.nio.IntBuffer fences)
      • glDeleteFencesNV

        public static void glDeleteFencesNV​(int fence)
      • nglGenFencesNV

        public static void nglGenFencesNV​(int n,
                                          long fences)
      • glGenFencesNV

        public static void glGenFencesNV​(java.nio.IntBuffer fences)
      • glGenFencesNV

        public static int glGenFencesNV()
      • glIsFenceNV

        public static boolean glIsFenceNV​(int fence)
      • glTestFenceNV

        public static boolean glTestFenceNV​(int fence)
      • nglGetFenceivNV

        public static void nglGetFenceivNV​(int fence,
                                           int pname,
                                           long params)
      • glGetFenceivNV

        public static void glGetFenceivNV​(int fence,
                                          int pname,
                                          java.nio.IntBuffer params)
      • glGetFenceiNV

        public static int glGetFenceiNV​(int fence,
                                        int pname)
      • glFinishFenceNV

        public static void glFinishFenceNV​(int fence)
      • glSetFenceNV

        public static void glSetFenceNV​(int fence,
                                        int condition)
      • glDeleteFencesNV

        public static void glDeleteFencesNV​(int[] fences)
        Array version of: DeleteFencesNV
      • glGenFencesNV

        public static void glGenFencesNV​(int[] fences)
        Array version of: GenFencesNV
      • glGetFenceivNV

        public static void glGetFenceivNV​(int fence,
                                          int pname,
                                          int[] params)
        Array version of: GetFenceivNV