C Specification
Possible values of flags in the instance modifying the behavior of
that instance are:
// Provided by VK_KHR_ray_tracing
typedef enum VkGeometryInstanceFlagBitsKHR {
VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR = 0x00000001,
VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHR = 0x00000002,
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR = 0x00000004,
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHR = 0x00000008,
// Provided by VK_NV_ray_tracing
VK_GEOMETRY_INSTANCE_TRIANGLE_CULL_DISABLE_BIT_NV = VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR,
// Provided by VK_NV_ray_tracing
VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_NV = VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHR,
// Provided by VK_NV_ray_tracing
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_NV = VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR,
// Provided by VK_NV_ray_tracing
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_NV = VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHR,
} VkGeometryInstanceFlagBitsKHR;
or the equivalent
// Provided by VK_NV_ray_tracing
typedef VkGeometryInstanceFlagBitsKHR VkGeometryInstanceFlagBitsNV;
Description
-
VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHRdisables face culling for this instance. -
VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHRindicates that the front face of the triangle for culling purposes is the face that is counter clockwise in object space relative to the ray origin. Because the facing is determined in object space, an instance transform matrix does not change the winding, but a geometry transform does. -
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHRcauses this instance to act as thoughVK_GEOMETRY_OPAQUE_BIT_KHRwere specified on all geometries referenced by this instance. This behavior can be overridden by the SPIR-VNoOpaqueKHRray flag. -
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHRcauses this instance to act as thoughVK_GEOMETRY_OPAQUE_BIT_KHRwere not specified on all geometries referenced by this instance. This behavior can be overridden by the SPIR-VOpaqueKHRray flag.
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHR and
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR must not be used in the
same flag.
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.