105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file transparencyAttrib.h
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* @author drose
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* @date 2002-02-28
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*/
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#ifndef TRANSPARENCYATTRIB_H
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#define TRANSPARENCYATTRIB_H
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#include "pandabase.h"
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#include "renderAttrib.h"
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class FactoryParams;
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/**
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* This controls the enabling of transparency. Simply setting an alpha
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* component to non-1 does not in itself make an object transparent; you must
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* also enable transparency mode with a suitable TransparencyAttrib.
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* Similarly, it is wasteful to render an object with a TransparencyAttrib in
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* effect unless you actually want it to be at least partially transparent
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* (and it has alpha components less than 1).
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*/
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class EXPCL_PANDA_PGRAPH TransparencyAttrib : public RenderAttrib {
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PUBLISHED:
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enum Mode {
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// The first two should be specifically 0 and 1, for historical reasons
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// (NodePath::set_transparency() used to accept a boolean value, which
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// corresponded to M_none or M_alpha).
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M_none = 0, // No transparency.
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M_alpha = 1, // Normal transparency, panda will sort back-to-front.
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M_premultiplied_alpha, // Assume textures use premultiplied alpha.
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M_multisample, // Uses ms buffer, alpha values modified to 1.0.
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M_multisample_mask, // Uses ms buffer, alpha values not modified.
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M_binary, // Only writes pixels with alpha >= 0.5.
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M_dual, // opaque parts first, then sorted transparent parts.
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};
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private:
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INLINE TransparencyAttrib(Mode mode = M_none);
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PUBLISHED:
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static CPT(RenderAttrib) make(Mode mode);
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static CPT(RenderAttrib) make_default();
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INLINE Mode get_mode() const;
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MAKE_PROPERTY(mode, get_mode);
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public:
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virtual void output(std::ostream &out) const;
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protected:
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virtual int compare_to_impl(const RenderAttrib *other) const;
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virtual size_t get_hash_impl() const;
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private:
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Mode _mode;
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PUBLISHED:
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static int get_class_slot() {
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return _attrib_slot;
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}
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virtual int get_slot() const {
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return get_class_slot();
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}
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MAKE_PROPERTY(class_slot, get_class_slot);
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public:
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static void register_with_read_factory();
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virtual void write_datagram(BamWriter *manager, Datagram &dg);
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protected:
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static TypedWritable *make_from_bam(const FactoryParams ¶ms);
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void fillin(DatagramIterator &scan, BamReader *manager);
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public:
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static TypeHandle get_class_type() {
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return _type_handle;
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}
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static void init_type() {
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RenderAttrib::init_type();
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register_type(_type_handle, "TransparencyAttrib",
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RenderAttrib::get_class_type());
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_attrib_slot = register_slot(_type_handle, 100, new TransparencyAttrib);
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}
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virtual TypeHandle get_type() const {
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return get_class_type();
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}
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virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
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private:
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static TypeHandle _type_handle;
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static int _attrib_slot;
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};
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#include "transparencyAttrib.I"
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#endif
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