## C Specification

Possible values of VkImageCompressionControlEXT::flags, specifying compression controls for an image, are:

// Provided by VK_EXT_image_compression_control
typedef enum VkImageCompressionFlagBitsEXT {
VK_IMAGE_COMPRESSION_DEFAULT_EXT = 0,
VK_IMAGE_COMPRESSION_FIXED_RATE_DEFAULT_EXT = 0x00000001,
VK_IMAGE_COMPRESSION_FIXED_RATE_EXPLICIT_EXT = 0x00000002,
VK_IMAGE_COMPRESSION_DISABLED_EXT = 0x00000004,
} VkImageCompressionFlagBitsEXT;

## Description

• VK_IMAGE_COMPRESSION_DEFAULT_EXT specifies that the default image compression setting is used. Implementations must not apply fixed-rate compression.

• VK_IMAGE_COMPRESSION_FIXED_RATE_DEFAULT_EXT specifies that the implementation may choose any supported fixed-rate compression setting in an implementation-defined manner based on the properties of the image.

• VK_IMAGE_COMPRESSION_FIXED_RATE_EXPLICIT_EXT specifies that fixed-rate compression may be used and that the allowed compression rates are specified by VkImageCompressionControlEXT::pFixedRateFlags.

• VK_IMAGE_COMPRESSION_DISABLED_EXT specifies that all lossless and fixed-rate compression should be disabled.

If VkImageCompressionControlEXT::flags is VK_IMAGE_COMPRESSION_FIXED_RATE_EXPLICIT_EXT, then the ith member of the pFixedRateFlags array specifies the allowed compression rates for the image’s ith plane.

 Note If VK_IMAGE_COMPRESSION_DISABLED_EXT is included in VkImageCompressionControlEXT::flags, both lossless and fixed-rate compression will be disabled. This is likely to have a negative impact on performance and is only intended to be used for debugging purposes.