Class NVFence

java.lang.Object
org.lwjgl.opengles.NVFence

public class NVFence extends 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).

  • Field Details

    • GL_ALL_COMPLETED_NV

      public static final int GL_ALL_COMPLETED_NV
      Accepted by the condition parameter of SetFenceNV.
      See Also:
    • GL_FENCE_STATUS_NV

      public static final int GL_FENCE_STATUS_NV
      Accepted by the pname parameter of GetFenceivNV.
      See Also:
    • GL_FENCE_CONDITION_NV

      public static final int GL_FENCE_CONDITION_NV
      Accepted by the pname parameter of GetFenceivNV.
      See Also:
  • Method Details

    • nglDeleteFencesNV

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

      public static void glDeleteFencesNV(IntBuffer fences)
    • glDeleteFencesNV

      public static void glDeleteFencesNV(int fence)
    • nglGenFencesNV

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

      public static void glGenFencesNV(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, 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