void
VirtualProgram::apply( osg::State& state ) const
{
if (_shaderMap.empty() && !_inheritSet)
{
// If there's no data in the VP, and never has been, unload any existing program.
// NOTE: OSG's State processor creates a "global default attribute" for each type.
// Sine we have no way of knowing whether the user created the VP or OSG created it
// as the default fallback, we use the "_inheritSet" flag to differeniate. This
// prevents any shader leakage from a VP-enabled node.
const unsigned int contextID = state.getContextID();
const osg::GL2Extensions* extensions = osg::GL2Extensions::Get(contextID,true);
if( ! extensions->isGlslSupported() ) return;
extensions->glUseProgram( 0 );
state.setLastAppliedProgramObject(0);
return;
}
// first, find and collect all the VirtualProgram attributes:
ShaderMap accumShaderMap;
AttribBindingList accumAttribBindings;
AttribAliasMap accumAttribAliases;
if ( _inherit )
{
const StateHack::AttributeVec* av = StateHack::GetAttributeVec( state, this );
if ( av && av->size() > 0 )
{
// find the deepest VP that doesn't inherit:
unsigned start = 0;
for( start = (int)av->size()-1; start > 0; --start )
{
const VirtualProgram* vp = dynamic_cast<const VirtualProgram*>( (*av)[start].first );
if ( vp && (vp->_mask & _mask) && vp->_inherit == false )
break;
}
// collect shaders from there to here:
for( unsigned i=start; i<av->size(); ++i )
{
const VirtualProgram* vp = dynamic_cast<const VirtualProgram*>( (*av)[i].first );
if ( vp && (vp->_mask && _mask) )
{
ShaderMap vpShaderMap;
vp->getShaderMap( vpShaderMap );
for( ShaderMap::const_iterator i = vpShaderMap.begin(); i != vpShaderMap.end(); ++i )
{
addToAccumulatedMap( accumShaderMap, i->first, i->second );
}
const AttribBindingList& abl = vp->getAttribBindingList();
accumAttribBindings.insert( abl.begin(), abl.end() );
#ifdef USE_ATTRIB_ALIASES
const AttribAliasMap& aliases = vp->getAttribAliases();
accumAttribAliases.insert( aliases.begin(), aliases.end() );
#endif
}
}
}
}
// next add the local shader components to the map, respecting the override values:
{
Threading::ScopedReadLock readonly(_dataModelMutex);
for( ShaderMap::const_iterator i = _shaderMap.begin(); i != _shaderMap.end(); ++i )
{
addToAccumulatedMap( accumShaderMap, i->first, i->second );
}
const AttribBindingList& abl = this->getAttribBindingList();
accumAttribBindings.insert( abl.begin(), abl.end() );
#ifdef USE_ATTRIB_ALIASES
const AttribAliasMap& aliases = this->getAttribAliases();
accumAttribAliases.insert( aliases.begin(), aliases.end() );
#endif
}
if ( true ) //even with nothing in the map, we still want mains! -gw //accumShaderMap.size() )
{
// next, assemble a list of the shaders in the map so we can use it as our
// program cache key.
// (Note: at present, the "cache key" does not include any information on the vertex
// attribute bindings. Technically it should, but in practice this might not be an
// issue; it is unlikely one would have two identical shader programs with different
// bindings.)
ShaderVector vec;
vec.reserve( accumShaderMap.size() );
for( ShaderMap::iterator i = accumShaderMap.begin(); i != accumShaderMap.end(); ++i )
{
ShaderEntry& entry = i->second;
vec.push_back( entry.first.get() );
}
// see if there's already a program associated with this list:
osg::ref_ptr<osg::Program> program;
// look up the program:
{
Threading::ScopedReadLock shared( _programCacheMutex );
ProgramMap::const_iterator p = _programCache.find( vec );
if ( p != _programCache.end() )
{
program = p->second.get();
}
}
// if not found, lock and build it:
if ( !program.valid() )
{
// build a new set of accumulated functions, to support the creation of main()
ShaderComp::FunctionLocationMap accumFunctions;
accumulateFunctions( state, accumFunctions );
// now double-check the program cache, and failing that, build the
// new shader Program.
{
Threading::ScopedWriteLock exclusive( _programCacheMutex );
// double-check: look again ito negate race conditions
ProgramMap::const_iterator p = _programCache.find( vec );
if ( p != _programCache.end() )
{
program = p->second.get();
}
else
{
ShaderVector keyVector;
//OE_NOTICE << LC << "Building new Program for VP " << getName() << std::endl;
program = buildProgram(
getName(),
state,
accumFunctions,
accumShaderMap,
accumAttribBindings,
accumAttribAliases,
_template.get(),
keyVector);
// finally, put own new program in the cache.
_programCache[ keyVector ] = program;
}
}
}
// finally, apply the program attribute.
if ( program.valid() )
{
program->apply( state );
}
}
}
void
VirtualProgram::apply( osg::State& state ) const
{
if ( _shaderMap.empty() )
{
// if there's no data in the VP, unload any existing program.
const unsigned int contextID = state.getContextID();
const osg::GL2Extensions* extensions = osg::GL2Extensions::Get(contextID,true);
if( ! extensions->isGlslSupported() ) return;
extensions->glUseProgram( 0 );
state.setLastAppliedProgramObject(0);
return;
}
// first, find and collect all the VirtualProgram attributes:
ShaderMap accumShaderMap;
AttribBindingList accumAttribBindings;
if ( _inherit )
{
const StateHack::AttributeVec* av = StateHack::GetAttributeVec( state, this );
if ( av && av->size() > 0 )
{
// find the deepest VP that doesn't inherit:
unsigned start = 0;
for( start = (int)av->size()-1; start > 0; --start )
{
const VirtualProgram* vp = dynamic_cast<const VirtualProgram*>( (*av)[start].first );
if ( vp && (vp->_mask & _mask) && vp->_inherit == false )
break;
}
// collect shaders from there to here:
for( unsigned i=start; i<av->size(); ++i )
{
const VirtualProgram* vp = dynamic_cast<const VirtualProgram*>( (*av)[i].first );
if ( vp && (vp->_mask && _mask) )
{
for( ShaderMap::const_iterator i = vp->_shaderMap.begin(); i != vp->_shaderMap.end(); ++i )
{
addToAccumulatedMap( accumShaderMap, i->first, i->second );
}
const AttribBindingList& abl = vp->getAttribBindingList();
accumAttribBindings.insert( abl.begin(), abl.end() );
}
}
}
}
// next add the local shader components to the map, respecting the override values:
for( ShaderMap::const_iterator i = _shaderMap.begin(); i != _shaderMap.end(); ++i )
{
addToAccumulatedMap( accumShaderMap, i->first, i->second );
}
const AttribBindingList& abl = this->getAttribBindingList();
accumAttribBindings.insert( abl.begin(), abl.end() );
if ( accumShaderMap.size() )
{
// next, assemble a list of the shaders in the map so we can use it as our
// program cache key.
// (Note: at present, the "cache key" does not include any information on the vertex
// attribute bindings. Technically it should, but in practice this might not be an
// issue; it is unlikely one would have two identical shader programs with different
// bindings.)
ShaderVector vec;
vec.reserve( accumShaderMap.size() );
for( ShaderMap::iterator i = accumShaderMap.begin(); i != accumShaderMap.end(); ++i )
{
ShaderEntry& entry = i->second;
vec.push_back( entry.first.get() );
}
// see if there's already a program associated with this list:
osg::Program* program = 0L;
// look up the program:
{
Threading::ScopedReadLock shared( _programCacheMutex );
ProgramMap::const_iterator p = _programCache.find( vec );
if ( p != _programCache.end() )
{
program = p->second.get();
}
}
// if not found, lock and build it:
if ( !program )
{
Threading::ScopedWriteLock exclusive( _programCacheMutex );
// look again in case of contention:
ProgramMap::const_iterator p = _programCache.find( vec );
if ( p != _programCache.end() )
{
program = p->second.get();
}
else
{
VirtualProgram* nc = const_cast<VirtualProgram*>(this);
program = nc->buildProgram( state, accumShaderMap, accumAttribBindings );
}
}
// finally, apply the program attribute.
program->apply( state );
}
}
