C Specification
If the pipeline’s
VkPipelineMultisampleStateCreateInfo::rasterizationSamples
is
greater than the VkAttachmentDescription::samples
of the color
attachments in the subpass, then the fragment’s coverage is reduced from
rasterizationSamples
bits to a color sample mask with
VkAttachmentDescription::samples
bits.
When the VK_NV_coverage_reduction_mode
extension is enabled, the pipeline
state controlling coverage reduction is specified through the members of the
VkPipelineCoverageReductionStateCreateInfoNV
structure.
The VkPipelineCoverageReductionStateCreateInfoNV
structure is defined
as:
// Provided by VK_NV_coverage_reduction_mode
typedef struct VkPipelineCoverageReductionStateCreateInfoNV {
VkStructureType sType;
const void* pNext;
VkPipelineCoverageReductionStateCreateFlagsNV flags;
VkCoverageReductionModeNV coverageReductionMode;
} VkPipelineCoverageReductionStateCreateInfoNV;
Members
-
sType
is the type of this structure. -
pNext
isNULL
or a pointer to a structure extending this structure. -
flags
is reserved for future use. -
coverageReductionMode
is a VkCoverageReductionModeNV value controlling how the color sample mask is generated from the coverage mask.
Description
If this structure is not present, the default coverage reduction mode is inferred as follows:
-
If the
VK_NV_framebuffer_mixed_samples
extension is enabled, then it is as if thecoverageReductionMode
isVK_COVERAGE_REDUCTION_MODE_MERGE_NV
. -
If the
VK_AMD_mixed_attachment_samples
extension is enabled, then it is as if thecoverageReductionMode
isVK_COVERAGE_REDUCTION_MODE_TRUNCATE_NV
. -
If both
VK_NV_framebuffer_mixed_samples
andVK_AMD_mixed_attachment_samples
are enabled, then the default coverage reduction mode is implementation-dependent.
Document Notes
For more information, see the Vulkan Specification
This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.