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,
VK_GEOMETRY_INSTANCE_TRIANGLE_CULL_DISABLE_BIT_NV = VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR,
VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_NV = VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHR,
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_NV = VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR,
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_KHR
disables face culling for this instance. -
VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHR
indicates 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_KHR
causes this instance to act as thoughVK_GEOMETRY_OPAQUE_BIT_KHR
were specified on all geometries referenced by this instance. This behavior can be overridden by the SPIR-VNoOpaqueKHR
ray flag. -
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHR
causes this instance to act as thoughVK_GEOMETRY_OPAQUE_BIT_KHR
were not specified on all geometries referenced by this instance. This behavior can be overridden by the SPIR-VOpaqueKHR
ray 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.