ATTACHMENT_LOAD_OP_LOAD specifies that the previous contents of the image within the render area will be preserved as the initial values. For attachments with a depth/stencil format, this uses the access type ACCESS_DEPTH_STENCIL_ATTACHMENT_READ_BIT. For attachments with a color format, this uses the access type ACCESS_COLOR_ATTACHMENT_READ_BIT.

ATTACHMENT_LOAD_OP_CLEAR specifies that the contents within the render area will be cleared to a uniform value, which is specified when a render pass instance is begun. For attachments with a depth/stencil format, this uses the access type ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT. For attachments with a color format, this uses the access type ACCESS_COLOR_ATTACHMENT_WRITE_BIT.

ATTACHMENT_LOAD_OP_DONT_CARE specifies that the previous contents within the area need not be preserved; the contents of the attachment will be undefined inside the render area. For attachments with a depth/stencil format, this uses the access type ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT. For attachments with a color format, this uses the access type ACCESS_COLOR_ATTACHMENT_WRITE_BIT.

ATTACHMENT_LOAD_OP_NONE_EXT specifies that the previous contents of the image will be undefined inside the render pass. No access type is used as the image is not accessed.