# DepthOffsetAttrib

from pandac.PandaModules import DepthOffsetAttrib

Class : DepthOffsetAttrib
Description : This is a special kind of attribute that instructs the graphics driver to apply an offset or bias to the generated depth values for rendered polygons, before they are written to the depth buffer.
This can be used to shift polygons forward slightly, to resolve depth conflicts. The cull traverser may optionally use this, for instance, to implement decals. However, driver support for this feature seems to be spotty, so use with caution.
The bias is always an integer number, and each integer increment represents the smallest possible increment in Z that is sufficient to completely resolve two coplanar polygons. Positive numbers are closer towards the camera.
Nested DepthOffsetAttrib values accumulate; that is, a DepthOffsetAttrib with a value of 1 beneath another DepthOffsetAttrib with a value of 2 presents a net offset of 3. (A DepthOffsetAttrib will not, however, combine with any other DepthOffsetAttribs with a lower override parameter.) The net value should probably not exceed 16 or drop below 0 for maximum portability.

## Inheritance:

DepthOffsetAttrib: RenderAttrib
RenderAttrib: TypedWritableReferenceCount
TypedWritableReferenceCount: TypedWritable ReferenceCount
TypedWritable: TypedObject
TypedObject:
ReferenceCount:

## Methods of DepthOffsetAttrib:

getClassType
getOffset
make

## Methods of RenderAttrib:

compareTo
getClassType
getNumAttribs
listAttribs
output
validateAttribs
write

## Methods of TypedWritableReferenceCount:

getClassType

## Methods of TypedWritable:

getClassType

## Methods of TypedObject:

getBestParentFromSet
getClassType
getType
getTypeIndex
isExactType
isOfType

## Methods of ReferenceCount:

getClassType
getRefCount
ref
testRefCountIntegrity
unref

## Constants in RenderAttrib:

MNone | (PandaCompareFunc)
MNever | (PandaCompareFunc)
MLess | (PandaCompareFunc)
MEqual | (PandaCompareFunc)
MLessEqual | (PandaCompareFunc)
MGreater | (PandaCompareFunc)
MNotEqual | (PandaCompareFunc)
MGreaterEqual | (PandaCompareFunc)
MAlways | (PandaCompareFunc)
MOff | (TexGenMode)
MEyeSphereMap | (TexGenMode)
MWorldCubeMap | (TexGenMode)
MEyeCubeMap | (TexGenMode)
MWorldNormal | (TexGenMode)
MEyeNormal | (TexGenMode)
MWorldPosition | (TexGenMode)
MUnused | (TexGenMode)
MEyePosition | (TexGenMode)
MPointSprite | (TexGenMode)
MLightVector | (TexGenMode)

getClassType static TypeHandle DepthOffsetAttrib::get_class_type(void); Undocumented function.

getOffset int DepthOffsetAttrib::get_offset(void) const; Description: Returns the depth offset represented by this attrib.

make static ConstPointerTo< RenderAttrib > DepthOffsetAttrib::make(int offset = (1)); Description: Constructs a new DepthOffsetAttrib object that indicates the relative amount of bias to write to the depth buffer for subsequent geometry.

compareTo int RenderAttrib::compare_to(RenderAttrib const &other) const; Description: Provides an arbitrary ordering among all unique RenderAttribs, so we can store the essentially different ones in a big set and throw away the rest. This method is not needed outside of the RenderAttrib class because all equivalent RenderAttrib objects are guaranteed to share the same pointer; thus, a pointer comparison is always sufficient.

getClassType static TypeHandle RenderAttrib::get_class_type(void); Undocumented function.

getNumAttribs static int RenderAttrib::get_num_attribs(void); Description: Returns the total number of unique RenderAttrib objects allocated in the world. This will go up and down during normal operations.

listAttribs static void RenderAttrib::list_attribs(ostream &out); Description: Lists all of the RenderAttribs in the cache to the output stream, one per line. This can be quite a lot of output if the cache is large, so be prepared.

output virtual void RenderAttrib::output(ostream &out) const; Description:

validateAttribs static bool RenderAttrib::validate_attribs(void); Description: Ensures that the cache is still stored in sorted order. Returns true if so, false if there is a problem (which implies someone has modified one of the supposedly-const RenderAttrib objects).

write virtual void RenderAttrib::write(ostream &out, int indent_level) const; Description:

getClassType static TypeHandle TypedWritableReferenceCount::get_class_type(void); Undocumented function.

getClassType static TypeHandle TypedWritable::get_class_type(void); Undocumented function.

getBestParentFromSet int TypedObject::get_best_parent_from_Set(set< int > const &) const; Description: Returns true if the current object is the indicated type exactly.

getClassType static TypeHandle TypedObject::get_class_type(void); Undocumented function.

getType virtual TypeHandle TypedObject::get_type(void) const = 0; Derived classes should override this function to return get_class_type().

getTypeIndex int TypedObject::get_type_index(void) const; Description: Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. This is equivalent to get_type().get_index().

isExactType bool TypedObject::is_exact_type(TypeHandle handle) const; Description: Returns true if the current object is the indicated type exactly.

isOfType bool TypedObject::is_of_type(TypeHandle handle) const; Description: Returns true if the current object is or derives from the indicated type.

getClassType static TypeHandle ReferenceCount::get_class_type(void); Undocumented function.

getRefCount int ReferenceCount::get_ref_count(void) const; Description: Returns the current reference count.

ref void ReferenceCount::ref(void) const; Description: Explicitly increments the reference count. User code should avoid using ref() and unref() directly, which can result in missed reference counts. Instead, let a PointerTo object manage the reference counting automatically. This function is const, even though it changes the object, because generally fiddling with an object's reference count isn't considered part of fiddling with the object. An object might be const in other ways, but we still need to accurately count the number of references to it.

testRefCountIntegrity bool ReferenceCount::test_ref_count_integrity(void) const; Description: Does some easy checks to make sure that the reference count isn't completely bogus. Returns true if ok, false otherwise.

unref bool ReferenceCount::unref(void) const; Description: Explicitly decrements the reference count. Note that the object will not be implicitly deleted by unref() simply because the reference count drops to zero. (Having a member function delete itself is problematic; plus, we don't have a virtual destructor anyway.) However, see the helper function unref_delete(). User code should avoid using ref() and unref() directly, which can result in missed reference counts. Instead, let a PointerTo object manage the reference counting automatically. This function is const, even though it changes the object, because generally fiddling with an object's reference count isn't considered part of fiddling with the object. An object might be const in other ways, but we still need to accurately count the number of references to it. The return value is true if the new reference count is nonzero, false if it is zero.