Package org.lwjgl.opengl

Class EXTPolygonOffsetClamp


  • public class EXTPolygonOffsetClamp
extends java.lang.Object
    Native bindings to the EXT_polygon_offset_clamp extension.

    This extension adds a new parameter to the polygon offset function that clamps the calculated offset to a minimum or maximum value. The clamping functionality is useful when polygons are nearly parallel to the view direction because their high slopes can result in arbitrarily large polygon offsets. In the particular case of shadow mapping, the lack of clamping can produce the appearance of unwanted holes when the shadow casting polygons are offset beyond the shadow receiving polygons, and this problem can be alleviated by enforcing a maximum offset value.

    Requires OpenGL 3.3.

    • Field Summary

      Fields 
      Modifier and Type Field and Description
      static int GL_POLYGON_OFFSET_CLAMP_EXT
      Accepted by the pname parameters of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv, and GetDoublev.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method and Description
      static void glPolygonOffsetClampEXT(float factor, float units, float clamp)
      The depth values of all fragments generated by the rasterization of a polygon may be offset by a single value that is computed for that polygon.

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • GL_POLYGON_OFFSET_CLAMP_EXT

        public static final int GL_POLYGON_OFFSET_CLAMP_EXT
        Accepted by the pname parameters of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv, and GetDoublev.
        See Also:
        Constant Field Values

    • Method Detail

      • glPolygonOffsetClampEXT

        public static void glPolygonOffsetClampEXT(float factor,
                                           float units,
                                           float clamp)
        The depth values of all fragments generated by the rasterization of a polygon may be offset by a single value that is computed for that polygon. The function that determines this value is specified with this command.

        factor scales the maximum depth slope of the polygon, and units scales an implementation-dependent constant that relates to the usable resolution of the depth buffer. The resulting values are summed to produce the polygon offset value, which may then be clamped to a minimum or maximum value specified by clamp. The values factor, units, and clamp may each be positive, negative, or zero. Calling the command PolygonOffset is equivalent to calling the command PolygonOffsetClampEXT with clamp equal to zero."

        Parameters:
        factor - scales the maximum depth slope of the polygon
        units - scales an implementation-dependent constant that relates to the usable resolution of the depth buffer
        clamp - the minimum or maximum clamp value