Package org.lwjgl.vulkan

Class EXTConservativeRasterization

java.lang.Object

org.lwjgl.vulkan.EXTConservativeRasterization

public final class EXTConservativeRasterization
extends java.lang.Object

This extension adds a new rasterization mode called conservative rasterization. There are two modes of conservative rasterization; overestimation and underestimation.

When overestimation is enabled, if any part of the primitive, including its edges, covers any part of the rectangular pixel area, including its sides, then a fragment is generated with all coverage samples turned on. This extension allows for some variation in implementations by accounting for differences in overestimation, where the generating primitive size is increased at each of its edges by some sub-pixel amount to further increase conservative pixel coverage. Implementations can allow the application to specify an extra overestimation beyond the base overestimation the implementation already does. It also allows implementations to either cull degenerate primitives or rasterize them.

When underestimation is enabled, fragments are only generated if the rectangular pixel area is fully covered by the generating primitive. If supported by the implementation, when a pixel rectangle is fully covered the fragment shader input variable builtin called FullyCoveredEXT is set to true. The shader variable works in either overestimation or underestimation mode.

Implementations can process degenerate triangles and lines by either discarding them or generating conservative fragments for them. Degenerate triangles are those that end up with zero area after the rasterizer quantizes them to the fixed-point pixel grid. Degenerate lines are those with zero length after quantization.

Name String

VK_EXT_conservative_rasterization

Extension Type

Device extension

Registered Extension Number

102

Revision

1

Extension and Version Dependencies

• Requires Vulkan 1.0
• Requires VK_KHR_get_physical_device_properties2

Contact

• Piers Daniell pdaniell-nv

Last Modified Data

2017-08-28

Contributors

• Daniel Koch, NVIDIA
• Daniel Rakos, AMD
• Jeff Bolz, NVIDIA
• Slawomir Grajewski, Intel
• Stu Smith, Imagination Technologies

Field Summary

Fields

Modifier and Type	Field	Description
static int	VK_CONSERVATIVE_RASTERIZATION_MODE_DISABLED_EXT VK_CONSERVATIVE_RASTERIZATION_MODE_OVERESTIMATE_EXT VK_CONSERVATIVE_RASTERIZATION_MODE_UNDERESTIMATE_EXT	VkConservativeRasterizationModeEXT - Specify the conservative rasterization mode
static java.lang.String	VK_EXT_CONSERVATIVE_RASTERIZATION_EXTENSION_NAME	The extension name.
static int	VK_EXT_CONSERVATIVE_RASTERIZATION_SPEC_VERSION	The extension specification version.
static int	VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_CONSERVATIVE_RASTERIZATION_PROPERTIES_EXT VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_CONSERVATIVE_STATE_CREATE_INFO_EXT	Extends VkStructureType.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

VK_EXT_CONSERVATIVE_RASTERIZATION_SPEC_VERSION

The extension specification version.

VK_EXT_CONSERVATIVE_RASTERIZATION_EXTENSION_NAME

The extension name.

VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_CONSERVATIVE_RASTERIZATION_PROPERTIES_EXT, VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_CONSERVATIVE_STATE_CREATE_INFO_EXT

Extends VkStructureType.

Enum values:

• STRUCTURE_TYPE_PHYSICAL_DEVICE_CONSERVATIVE_RASTERIZATION_PROPERTIES_EXT
• STRUCTURE_TYPE_PIPELINE_RASTERIZATION_CONSERVATIVE_STATE_CREATE_INFO_EXT

VK_CONSERVATIVE_RASTERIZATION_MODE_DISABLED_EXT, VK_CONSERVATIVE_RASTERIZATION_MODE_OVERESTIMATE_EXT, VK_CONSERVATIVE_RASTERIZATION_MODE_UNDERESTIMATE_EXT

VkConservativeRasterizationModeEXT - Specify the conservative rasterization mode

Description

• CONSERVATIVE_RASTERIZATION_MODE_DISABLED_EXT specifies that conservative rasterization is disabled and rasterization proceeds as normal.
• CONSERVATIVE_RASTERIZATION_MODE_OVERESTIMATE_EXT specifies that conservative rasterization is enabled in overestimation mode.
• CONSERVATIVE_RASTERIZATION_MODE_UNDERESTIMATE_EXT specifies that conservative rasterization is enabled in underestimation mode.

See Also

VkPipelineRasterizationConservativeStateCreateInfoEXT