bool TGlslOutputTraverser::traverseLoop( bool preVisit, TIntermLoop *node, TIntermTraverser *it )
{
TGlslOutputTraverser* goit = static_cast<TGlslOutputTraverser*>(it);
GlslFunction *current = goit->current;
std::stringstream& out = current->getActiveOutput();
current->beginStatement();
if ( node->getTerminal())
{
// Process for loop, initial statement was promoted outside the loop
out << "for ( ; ";
node->getTest()->traverse(goit);
out << "; ";
node->getTerminal()->traverse(goit);
out << ") ";
current->beginBlock();
if (node->getBody())
node->getBody()->traverse(goit);
current->endBlock();
}
else
{
if ( node->testFirst())
{
// Process while loop
out << "while ( ";
node->getTest()->traverse(goit);
out << " ) ";
current->beginBlock();
if (node->getBody())
node->getBody()->traverse(goit);
current->endBlock();
}
else
{
// Process do loop
out << "do ";
current->beginBlock();
if (node->getBody())
node->getBody()->traverse(goit);
current->endBlock();
current->indent();
out << "while ( ";
node->getTest()->traverse(goit);
out << " )\n";
}
}
return false;
}
bool TGlslOutputTraverser::traverseSelection( bool preVisit, TIntermSelection *node, TIntermTraverser *it )
{
TGlslOutputTraverser* goit = static_cast<TGlslOutputTraverser*>(it);
GlslFunction *current = goit->current;
std::stringstream& out = current->getActiveOutput();
current->beginStatement();
if (node->getBasicType() == EbtVoid)
{
// if/else selection
out << "if (";
node->getCondition()->traverse(goit);
out << ')';
current->beginBlock();
node->getTrueBlock()->traverse(goit);
current->endBlock();
if (node->getFalseBlock())
{
current->indent();
out << "else";
current->beginBlock();
node->getFalseBlock()->traverse(goit);
current->endBlock();
}
}
else if (node->isVector() && node->getCondition()->getAsTyped()->isVector())
{
// ?: selection on vectors, e.g. bvec4 ? vec4 : vec4
// emulate HLSL's component-wise selection here
current->addLibFunction(EOpVecTernarySel);
out << "xll_vecTSel (";
node->getCondition()->traverse(goit);
out << ", ";
node->getTrueBlock()->traverse(goit);
out << ", ";
if (node->getFalseBlock())
{
node->getFalseBlock()->traverse(goit);
}
else
assert(0);
out << ")";
}
else
{
// simple ?: selection
out << "(( ";
node->getCondition()->traverse(goit);
out << " ) ? ( ";
node->getTrueBlock()->traverse(goit);
out << " ) : ( ";
if (node->getFalseBlock())
{
node->getFalseBlock()->traverse(goit);
}
else
assert(0);
out << " ))";
}
return false;
}