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GL_EXT_vulkan_glsl_relaxed - retarget gl_VertexID to gl_VertexIndex

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instead of allowing for multiple declarations of the variable in the
resulting SPIR-V, instead use a retargeted mechanism to cause references
to gl_VertexID and gl_InstanceID to use the gl_VertexIndex and
gl_InstanceIndex symbol.
This commit is contained in:
Malcolm Bechard 2021-09-16 17:40:49 -04:00
parent 80dcc36907
commit 05794b46a7
7 changed files with 133 additions and 59 deletions
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29
glslang/MachineIndependent/SymbolTable.h
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@ -413,13 +413,20 @@ public:
TSymbolTableLevel() : defaultPrecision(0), anonId(0), thisLevel(false) { }
~TSymbolTableLevel();
bool insert(TSymbol& symbol, bool separateNameSpaces)
bool insert(const TString& name, TSymbol* symbol) {
return level.insert(tLevelPair(name, symbol)).second;
}
bool insert(TSymbol& symbol, bool separateNameSpaces, const TString& forcedKeyName = TString())
{
//
// returning true means symbol was added to the table with no semantic errors
//
const TString& name = symbol.getName();
if (name == "") {
if (forcedKeyName.length()) {
return level.insert(tLevelPair(forcedKeyName, &symbol)).second;
}
else if (name == "") {
symbol.getAsVariable()->setAnonId(anonId++);
// An empty name means an anonymous container, exposing its members to the external scope.
// Give it a name and insert its members in the symbol table, pointing to the container.
@ -471,6 +478,16 @@ public:
return true;
}
void retargetSymbol(const TString& from, const TString& to) {
tLevel::const_iterator fromIt = level.find(from);
tLevel::const_iterator toIt = level.find(to);
if (fromIt == level.end() || toIt == level.end())
return;
delete fromIt->second;
level[from] = toIt->second;
retargetedSymbols.push_back({from, to});
}
TSymbol* find(const TString& name) const
{
tLevel::const_iterator it = level.find(name);
@ -583,6 +600,8 @@ protected:
tLevel level; // named mappings
TPrecisionQualifier *defaultPrecision;
// pair<FromName, ToName>
TVector<std::pair<TString, TString>> retargetedSymbols;
int anonId;
bool thisLevel; // True if this level of the symbol table is a structure scope containing member function
// that are supposed to see anonymous access to member variables.
@ -788,6 +807,12 @@ public:
return symbol;
}
void retargetSymbol(const TString& from, const TString& to) {
int level = currentLevel();
table[level]->retargetSymbol(from, to);
}
// Find of a symbol that returns how many layers deep of nested
// structures-with-member-functions ('this' scopes) deep the symbol was
// found in.