VkImageCompressionControlEXT

If the pNext list of VkImageCreateInfo includes a VkImageCompressionControlEXT structure, then that structure describes compression controls for this image.

The VkImageCompressionControlEXT structure is defined as:

typedef struct VkImageCompressionControlEXT {
    VkStructureType sType;
    const void* pNext;
    VkImageCompressionFlagsEXT flags;
    uint32_t compressionControlPlaneCount;
    VkImageCompressionFixedRateFlagsEXT* pFixedRateFlags;
} VkImageCompressionControlEXT;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• flags is a bitmask of VkImageCompressionFlagBitsEXT describing compression controls for the image.
• compressionControlPlaneCount is the number of entries in the pFixedRateFlags array.
• pFixedRateFlags is NULL or a pointer to an array of VkImageCompressionFixedRateFlagsEXT bitfields describing allowed fixed-rate compression rates of each image plane. It is ignored if flags does not include VK_IMAGE_COMPRESSION_FIXED_RATE_EXPLICIT_EXT.

If enabled, fixed-rate compression is done in an implementation-defined manner and may be applied at block granularity. In that case, a write to an individual texel may modify the value of other texels in the same block.