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Added State::ApplyModeProxy to help with temporarily applying a mode

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This commit is contained in:
Robert Osfield
2016-09-02 14:20:17 +01:00
parent cfadbbda2b
commit 1914eb435b
1 changed files with 32 additions and 1 deletions
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33
include/osg/State
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@@ -327,6 +327,30 @@ class OSG_EXPORT State : public Referenced
return _modeMap[mode].global_default_value;
}
inline bool getLastAppliedModeValue(StateAttribute::GLMode mode)
{
return _modeMap[mode].last_applied_value;
}
/** Proxy helper class for applyig a model in a local scope, with the preivous value being resotred automatically on leaving the scope that proxy was created.*/
struct ApplyModeProxy
{
inline ApplyModeProxy(osg::State& state, GLenum mode, bool value):_state(state), _mode(mode)
{
_previous_value = _state.getLastAppliedModeValue(mode);
_need_to_apply_value = (_previous_value!=value);
if (_need_to_apply_value) _state.applyMode(_mode, value);
}
inline ~ApplyModeProxy()
{
if (_need_to_apply_value) _state.applyMode(_mode, _previous_value);
}
osg::State& _state;
GLenum _mode;
bool _previous_value;
bool _need_to_apply_value;
};
/** Apply an OpenGL mode if required. This is a wrapper around
* \c glEnable() and \c glDisable(), that just actually calls these
@@ -366,6 +390,13 @@ class OSG_EXPORT State : public Referenced
return applyModeOnTexUnit(unit,mode,enabled,ms);
}
inline bool getLastAppliedTextureModeValue(unsigned int unit, StateAttribute::GLMode mode)
{
ModeMap& modeMap = getOrCreateTextureModeMap(unit);
ModeStack& ms = modeMap[mode];
return ms.last_applied_value;
}
inline void setGlobalDefaultAttribute(const StateAttribute* attribute)
{
AttributeStack& as = _attributeMap[attribute->getTypeMemberPair()];
@@ -470,6 +501,7 @@ class OSG_EXPORT State : public Referenced
void dirtyAllAttributes();
/** Proxy helper class for applyig a VertexArrayState in a local scope, with the preivous value being resotred automatically on leaving the scope that proxy was created.*/
struct SetCurrentVertexArrayStateProxy
{
SetCurrentVertexArrayStateProxy(osg::State& state, VertexArrayState* vas):_state(state) { _state.setCurrentVertexArrayState(vas); }
@@ -477,7 +509,6 @@ class OSG_EXPORT State : public Referenced
osg::State& _state;
};
/** Set the CurrentVetexArrayState object that take which vertex arrays are bound.*/
void setCurrentVertexArrayState(VertexArrayState* vas) { _vas = vas; }