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:
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 an extension-specific 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.
Copyright
Copyright (c) 2014-2019 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.