Panda3D
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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. More...
#include <pandadoc.hpp>
Public Member Functions | |
float | getMaxValue () |
Returns the value for the maximum (farthest) depth value to be stored in the buffer, in the range 0 . More... | |
float | getMinValue () |
Returns the value for the minimum (closest) depth value to be stored in the buffer, in the range 0 . More... | |
int | getOffset () |
Returns the depth offset represented by this attrib. More... | |
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int | compareTo (const RenderAttrib other) |
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. More... | |
const RenderAttrib | compose (const RenderAttrib other) |
Returns a new RenderAttrib object that represents the composition of this attrib with the other attrib. More... | |
int | getHash () |
Returns a suitable hash value for phash_map. More... | |
int | getSlot () |
const RenderAttrib | getUnique () |
Returns the pointer to the unique RenderAttrib in the cache that is equivalent to this one. More... | |
const RenderAttrib | invertCompose (const RenderAttrib other) |
Returns a new RenderAttrib object that represents the composition of the inverse of this attrib with the other attrib. More... | |
bool | lowerAttribCanOverride () |
Intended to be overridden by derived RenderAttrib types to specify how two consecutive RenderAttrib objects of the same type interact. More... | |
output (Ostream out) | |
write (Ostream out, int indent_level) | |
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object | __reduce__ () |
object | __reduce_persist__ (object pickler) |
VectorUchar | encodeToBamStream () |
Converts the TypedWritable object into a single stream of data using a BamWriter, and returns that data as a bytes object. More... | |
bool | encodeToBamStream (VectorUchar data, BamWriter writer) |
Converts the TypedWritable object into a single stream of data using a BamWriter, and stores that data in the indicated string. More... | |
fillin (DatagramIterator scan, BamReader manager) | |
This internal function is intended to be called by each class's make_from_bam() method to read in all of the relevant data from the BamFile for the new object. More... | |
UpdateSeq | getBamModified () |
Returns the current bam_modified counter. More... | |
markBamModified () | |
Increments the bam_modified counter, so that this object will be invalidated and retransmitted on any open bam streams. More... | |
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TypeHandle | getType () |
int | getTypeIndex () |
Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. More... | |
bool | isExactType (TypeHandle handle) |
Returns true if the current object is the indicated type exactly. More... | |
bool | isOfType (TypeHandle handle) |
Returns true if the current object is or derives from the indicated type. More... | |
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int | getRefCount () |
Returns the current reference count. More... | |
ref () | |
Explicitly increments the reference count. More... | |
bool | testRefCountIntegrity () |
Does some easy checks to make sure that the reference count isn't completely bogus. More... | |
bool | testRefCountNonzero () |
Does some easy checks to make sure that the reference count isn't zero, or completely bogus. More... | |
bool | unref () |
Explicitly decrements the reference count. More... | |
Static Public Member Functions | |
static int | getClassSlot () |
static TypeHandle | getClassType () |
static const RenderAttrib | make (int offset) |
Constructs a new DepthOffsetAttrib object that indicates the relative amount of bias to write to the depth buffer for subsequent geometry. More... | |
static const RenderAttrib | make (int offset, float min_value, float max_value) |
Constructs a new DepthOffsetAttrib object that indicates the bias, and also specifies a minimum and maximum (or, more precisely, nearest and farthest) values to write to the depth buffer, in the range 0 . More... | |
static const RenderAttrib | makeDefault () |
Returns a RenderAttrib that corresponds to whatever the standard default properties for render attributes of this type ought to be. More... | |
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static int | garbageCollect () |
Performs a garbage-collection cycle. More... | |
static TypeHandle | getClassType () |
static int | getNumAttribs () |
Returns the total number of unique RenderAttrib objects allocated in the world. More... | |
static | listAttribs (Ostream out) |
Lists all of the RenderAttribs in the cache to the output stream, one per line. More... | |
static bool | validateAttribs () |
Ensures that the cache is still stored in sorted order. More... | |
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static TypedWritableReferenceCount | decodeFromBamStream (VectorUchar data, BamReader reader) |
Reads the bytes created by a previous call to encode_to_bam_stream(), and extracts and returns the single object on those bytes. More... | |
static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
Public Attributes | |
int | class_slot |
float | max_value |
Returns the value for the maximum (farthest) depth value to be stored in the buffer, in the range 0 . More... | |
float | min_value |
Returns the value for the minimum (closest) depth value to be stored in the buffer, in the range 0 . More... | |
int | offset |
Returns the depth offset represented by this attrib. More... | |
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int | slot |
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TypeHandle | type |
Returns the TypeHandle representing this object's type. More... | |
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int | ref_count |
The current reference count. More... | |
Additional Inherited Members | |
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enum | PandaCompareFunc { M_none = 0 , M_never = 1 , M_less = 2 , M_equal = 3 , M_less_equal = 4 , M_greater = 5 , M_not_equal = 6 , M_greater_equal = 7 , M_always = 8 } |
enum | TexGenMode { M_off = 0 , M_eye_sphere_map = 1 , M_world_cube_map = 2 , M_eye_cube_map = 3 , M_world_normal = 4 , M_eye_normal = 5 , M_world_position = 6 , M_unused = 7 , M_eye_position = 8 , M_point_sprite = 9 , M_unused2 = 10 , M_constant = 11 } |
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.
Also, and only tangentially related, the DepthOffsetAttrib can be used to constrain the Z output value to a subset of the usual [0, 1] range (or reversing its direction) by specifying a new min_value and max_value.
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float getMaxValue | ( | ) |
Returns the value for the maximum (farthest) depth value to be stored in the buffer, in the range 0 .
. 1.
float getMinValue | ( | ) |
Returns the value for the minimum (closest) depth value to be stored in the buffer, in the range 0 .
. 1.
int getOffset | ( | ) |
Returns the depth offset represented by this attrib.
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static |
Constructs a new DepthOffsetAttrib object that indicates the relative amount of bias to write to the depth buffer for subsequent geometry.
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static |
Constructs a new DepthOffsetAttrib object that indicates the bias, and also specifies a minimum and maximum (or, more precisely, nearest and farthest) values to write to the depth buffer, in the range 0 .
. 1. This range is 0, 1 by default; setting it to some other range can be used to create additional depth buffer effects.
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static |
Returns a RenderAttrib that corresponds to whatever the standard default properties for render attributes of this type ought to be.
int class_slot |
float max_value |
Returns the value for the maximum (farthest) depth value to be stored in the buffer, in the range 0 .
. 1.
float min_value |
Returns the value for the minimum (closest) depth value to be stored in the buffer, in the range 0 .
. 1.
int offset |
Returns the depth offset represented by this attrib.