Package org.lwjgl.opengl

Class ARBSampleShading

java.lang.Object
org.lwjgl.opengl.ARBSampleShading
public class ARBSampleShading extends Object
Native bindings to the ARB_sample_shading extension.

In standard multisample rendering, an implementation is allowed to assign the same color and texture coordinate values to each sample, which then allows the optimization where the shader is only evaluated once and then distributed to the samples that have been determined to be covered by the primitive currently being rasterized. This can cause aliasing where the input color and texture coordinates are used to generate a result that doesn't antialias itself, for example with alpha-tested transparency.

This extension adds the ability to explicitly request that an implementation use a minimum number of unique set of fragment computation inputs when multisampling a pixel. Specifying such a requirement can reduce aliasing that results from evaluating the fragment computations too few times per pixel.

This extension adds new global state that controls the minimum number of samples for which attribute data is independently interpolated. When enabled, all operations that were traditionally executed per-fragment operate independently on each sample.

This also extends the shading language to allow control over the sample being processed. This includes built-in fragment input variables identifying the sample number and position being processed when executing fragment shaders per sample.

Requires OpenGL 2.0 and GLSL 1.30. Promoted to core in OpenGL 3.0.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    GL_MIN_SAMPLE_SHADING_VALUE_ARB
    Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.
    static final int
    GL_SAMPLE_SHADING_ARB
    Accepted by the cap parameter of Enable, Disable, and IsEnabled, and by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev.

  • Method Summary

    Modifier and Type
    Method
    Description
    static void
    glMinSampleShadingARB(float value)
    Sets the minimum sample shading fraction.

    Methods inherited from class java.lang.Object

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

  • Field Details

    • GL_SAMPLE_SHADING_ARB

      public static final int GL_SAMPLE_SHADING_ARB
      Accepted by the cap parameter of Enable, Disable, and IsEnabled, and by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev.
      See Also:

    • GL_MIN_SAMPLE_SHADING_VALUE_ARB

      public static final int GL_MIN_SAMPLE_SHADING_VALUE_ARB
      Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.
      See Also:

  • Method Details

    • glMinSampleShadingARB

      public static void glMinSampleShadingARB(float value)
      Sets the minimum sample shading fraction. value is clamped to [0,1] when specified.
      Parameters:
      value - the minimum sample shading fraction