Package org.lwjgl.opengl

Class NVConservativeRaster

java.lang.Object

org.lwjgl.opengl.NVConservativeRaster

public class NVConservativeRaster
extends Object

Native bindings to the NV_conservative_raster extension.

This extension adds a "conservative" rasterization mode where any pixel that is partially covered, even if no sample location is covered, is treated as fully covered and a corresponding fragment will be shaded.

A new control is also added to modify window coordinate snapping precision.

These controls can be used to implement "binning" to a low-resolution render target, for example to determine which tiles of a sparse texture need to be populated. An app can construct a framebuffer where there is one pixel per tile in the sparse texture, and adjust the number of subpixel bits such that snapping occurs to the same effective grid as when rendering to the sparse texture. Then triangles should cover (at least) the same pixels in the low-res framebuffer as they do tiles in the sparse texture.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	GL_CONSERVATIVE_RASTERIZATION_NV	Accepted by the cap parameter of Enable, Disable, IsEnabled.
static final int	GL_MAX_SUBPIXEL_PRECISION_BIAS_BITS_NV	Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.
static final int	GL_SUBPIXEL_PRECISION_BIAS_X_BITS_NV	Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.
static final int	GL_SUBPIXEL_PRECISION_BIAS_Y_BITS_NV	Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.

Method Summary

Modifier and Type	Method	Description
static void	glSubpixelPrecisionBiasNV(int xbits, int ybits)	Sets the SUBPIXEL_PRECISION_BIAS_X_BITS_NV and SUBPIXEL_PRECISION_BIAS_Y_BITS_NV values.

Methods inherited from class java.lang.Object

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

Field Details

GL_CONSERVATIVE_RASTERIZATION_NV

public static final int GL_CONSERVATIVE_RASTERIZATION_NV

Accepted by the cap parameter of Enable, Disable, IsEnabled.

See Also:

• Constant Field Values

GL_SUBPIXEL_PRECISION_BIAS_X_BITS_NV

public static final int GL_SUBPIXEL_PRECISION_BIAS_X_BITS_NV

Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.

See Also:

• Constant Field Values

GL_SUBPIXEL_PRECISION_BIAS_Y_BITS_NV

public static final int GL_SUBPIXEL_PRECISION_BIAS_Y_BITS_NV

Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.

See Also:

• Constant Field Values

GL_MAX_SUBPIXEL_PRECISION_BIAS_BITS_NV

public static final int GL_MAX_SUBPIXEL_PRECISION_BIAS_BITS_NV

Accepted by the pname parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv.

See Also:

• Constant Field Values

Method Details

glSubpixelPrecisionBiasNV

public static void glSubpixelPrecisionBiasNV(int xbits,
 int ybits)

Sets the SUBPIXEL_PRECISION_BIAS_X_BITS_NV and SUBPIXEL_PRECISION_BIAS_Y_BITS_NV values.

The vertex's window x and y coordinates may be optionally converted to fixed-point values with N fractional bits. If CONSERVATIVE_RASTERIZATION_NV is disabled, then N is the implementation-dependent value of SUBPIXEL_BITS. If CONSERVATIVE_RASTERIZATION_NV is enabled, N is computed as the sum of the value of SUBPIXEL_BITS and programmable values of SUBPIXEL_PRECISION_BIAS_X_BITS_NV and SUBPIXEL_PRECISION_BIAS_Y_BITS_NV.

When these values are non-zero, the invariance requirement may not apply because the subpixel precision may not be the same at all window coordinates.

Parameters:

xbits - the SUBPIXEL_PRECISION_BIAS_X_BITS_NV value. The initial value is zero.

ybits - the SUBPIXEL_PRECISION_BIAS_Y_BITS_NV value. The initial value is zero.