VkPipelineMultisampleStateCreateInfo

The VkPipelineMultisampleStateCreateInfo structure is defined as:

typedef struct VkPipelineMultisampleStateCreateInfo {
    VkStructureType sType;
    const void* pNext;
    VkPipelineMultisampleStateCreateFlags flags;
    VkSampleCountFlagBits rasterizationSamples;
    VkBool32 sampleShadingEnable;
    float minSampleShading;
    const VkSampleMask* pSampleMask;
    VkBool32 alphaToCoverageEnable;
    VkBool32 alphaToOneEnable;
} VkPipelineMultisampleStateCreateInfo;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• flags is reserved for future use.
• rasterizationSamples is a VkSampleCountFlagBits value specifying the number of samples used in rasterization. This value is ignored for the purposes of setting the number of samples used in rasterization if the pipeline is created with the VK_DYNAMIC_STATE_RASTERIZATION_SAMPLES_EXT dynamic state set, but if VK_DYNAMIC_STATE_SAMPLE_MASK_EXT dynamic state is not set, it is still used to define the size of the pSampleMask array as described below.
• sampleShadingEnable can be used to enable Sample Shading.
• minSampleShading specifies a minimum fraction of sample shading if sampleShadingEnable is VK_TRUE.
• pSampleMask is a pointer to an array of VkSampleMask values used in the sample mask test.
• alphaToCoverageEnable controls whether a temporary coverage value is generated based on the alpha component of the fragment’s first color output as specified in the Multisample Coverage section.
• alphaToOneEnable controls whether the alpha component of the fragment’s first color output is replaced with one as described in Multisample Coverage.

Each bit in the sample mask is associated with a unique sample index as defined for the coverage mask. Each bit b for mask word w in the sample mask corresponds to sample index i, where i = 32 × w + b. pSampleMask has a length equal to ⌈ rasterizationSamples / 32 ⌉ words.

If pSampleMask is NULL, it is treated as if the mask has all bits set to 1.