org.lwjgl.opengl

Class ARBSampleShading

java.lang.Object

org.lwjgl.opengl.ARBSampleShading

public class ARBSampleShading
extends java.lang.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 and Description
static int	GL_MIN_SAMPLE_SHADING_VALUE_ARB Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.
static 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 and 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 Detail

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:

Constant Field Values

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:

Constant Field Values

Method Detail

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