Package org.lwjgl.vulkan

Class VkPhysicalDeviceConservativeRasterizationPropertiesEXT

  • All Implemented Interfaces:
    java.lang.AutoCloseable, org.lwjgl.system.NativeResource, org.lwjgl.system.Pointer
    public class VkPhysicalDeviceConservativeRasterizationPropertiesEXT
extends org.lwjgl.system.Struct
implements org.lwjgl.system.NativeResource
    Structure describing conservative raster properties that can be supported by an implementation.
    Description

    If the VkPhysicalDeviceConservativeRasterizationPropertiesEXT structure is included in the pNext chain of VkPhysicalDeviceProperties2, it is filled with the implementation-dependent limits and properties.

    Valid Usage (Implicit)

    Member documentation

    • sType – the type of this structure.
    • pNext – NULL or a pointer to an extension-specific structure.
    • primitiveOverestimationSize – the size in pixels the generating primitive is increased at each of its edges during conservative rasterization overestimation mode. Even with a size of 0.0, conservative rasterization overestimation rules still apply and if any part of the pixel rectangle is covered by the generating primitive, fragments are generated for the entire pixel. However implementations may make the pixel coverage area even more conservative by increasing the size of the generating primitive.
    • maxExtraPrimitiveOverestimationSize – the maximum size in pixels of extra overestimation the implementation supports in the pipeline state. A value of 0.0 means the implementation does not support any additional overestimation of the generating primitive during conservative rasterization. A value above 0.0 allows the application to further increase the size of the generating primitive during conservative rasterization overestimation.
    • extraPrimitiveOverestimationSizeGranularity – the granularity of extra overestimation that can be specified in the pipeline state between 0.0 and maxExtraPrimitiveOverestimationSize inclusive. A value of 0.0 means the implementation can use the smallest representable non-zero value in the screen space pixel fixed-point grid.
    • primitiveUnderestimation – true if the implementation supports the CONSERVATIVE_RASTERIZATION_MODE_UNDERESTIMATE_EXT conservative rasterization mode in addition to CONSERVATIVE_RASTERIZATION_MODE_OVERESTIMATE_EXT. Otherwise the implementation only supports CONSERVATIVE_RASTERIZATION_MODE_OVERESTIMATE_EXT.
    • conservativePointAndLineRasterization – true if the implementation supports conservative rasterization of point and line primitives as well as triangle primitives. Otherwise the implementation only supports triangle primitives.
    • degenerateTrianglesRasterized – false if the implementation culls primitives generated from triangles that become zero area after they are quantized to the fixed-point rasterization pixel grid. degenerateTrianglesRasterized is true if these primitives are not culled and the provoking vertex attributes and depth value are used for the fragments. The primitive area calculation is done on the primitive generated from the clipped triangle if applicable. Zero area primitives are backfacing and the application can enable backface culling if desired.
    • degenerateLinesRasterized – false if the implementation culls lines that become zero length after they are quantized to the fixed-point rasterization pixel grid. degenerateLinesRasterized is true if zero length lines are not culled and the provoking vertex attributes and depth value are used for the fragments.
    • fullyCoveredFragmentShaderInputVariable – true if the implementation supports the SPIR-V builtin fragment shader input variable FullyCoveredEXT which specifies that conservative rasterization is enabled and the fragment area is fully covered by the generating primitive.
    • conservativeRasterizationPostDepthCoverage – true if the implementation supports conservative rasterization with the PostDepthCoverage execution mode enabled. When supported the SampleMask built-in input variable will reflect the coverage after the early per-fragment depth and stencil tests are applied even when conservative rasterization is enabled. Otherwise PostDepthCoverage execution mode must not be used when conservative rasterization is enabled.

    Layout

    
 struct VkPhysicalDeviceConservativeRasterizationPropertiesEXT {
     VkStructureType sType;
     void * pNext;
     float primitiveOverestimationSize;
     float maxExtraPrimitiveOverestimationSize;
     float extraPrimitiveOverestimationSizeGranularity;
     VkBool32 primitiveUnderestimation;
     VkBool32 conservativePointAndLineRasterization;
     VkBool32 degenerateTrianglesRasterized;
     VkBool32 degenerateLinesRasterized;
     VkBool32 fullyCoveredFragmentShaderInputVariable;
     VkBool32 conservativeRasterizationPostDepthCoverage;
 }