Add some documentation to the GLSL compiler

[libs/gl.git] / source / glsl / optimize.cpp

diff --git a/source/glsl/optimize.cpp b/source/glsl/optimize.cpp
index 4f1f8629a58f46964fc34ba7bb11e172b39f2037..2215f8335cd06a23ea71e2c381cb1776362b81cd 100644 (file)
--- a/source/glsl/optimize.cpp
+++ b/source/glsl/optimize.cpp
@@ -14,7 +14,7 @@ InlineableFunctionLocator::InlineableFunctionLocator():
 void InlineableFunctionLocator::visit(FunctionCall &call)
 {
        FunctionDeclaration *def = call.declaration;
-       if(def && def->definition!=def)
+       if(def)
                def = def->definition;
 
        if(def)
@@ -46,7 +46,7 @@ FunctionInliner::FunctionInliner():
 void FunctionInliner::apply(Stage &stage)
 {
        inlineable = InlineableFunctionLocator().apply(stage);
-       visit(stage.content);
+       stage.content.visit(*this);
 }
 
 void FunctionInliner::visit_and_inline(RefPtr<Expression> &ptr)
@@ -95,7 +95,7 @@ void FunctionInliner::visit(FunctionCall &call)
                visit_and_inline(*i);
 
        FunctionDeclaration *def = call.declaration;
-       if(def && def->definition!=def)
+       if(def)
                def = def->definition;
 
        if(def && inlineable.count(def))
@@ -129,7 +129,7 @@ ConstantConditionEliminator::ConstantConditionEliminator():
 
 void ConstantConditionEliminator::apply(Stage &stage)
 {
-       visit(stage.content);
+       stage.content.visit(*this);
        NodeRemover().apply(stage, nodes_to_remove);
 }
 
@@ -160,7 +160,13 @@ void ConstantConditionEliminator::visit(Assignment &assign)
 
 void ConstantConditionEliminator::visit(VariableDeclaration &var)
 {
-       if(var.constant || current_block->parent)
+       bool constant = var.constant;
+       if(constant && var.layout)
+       {
+               for(vector<Layout::Qualifier>::const_iterator i=var.layout->qualifiers.begin(); (constant && i!=var.layout->qualifiers.end()); ++i)
+                       constant = (i->name!="constant_id");
+       }
+       if((constant || current_block->parent) && var.init_expression)
                variable_values[&var] = var.init_expression.get();
 }
 
@@ -231,7 +237,7 @@ UnusedVariableRemover::UnusedVariableRemover():
 bool UnusedVariableRemover::apply(Stage &stage)
 {
        variables.push_back(BlockVariableMap());
-       visit(stage.content);
+       stage.content.visit(*this);
        BlockVariableMap &global_variables = variables.back();
        for(BlockVariableMap::iterator i=global_variables.begin(); i!=global_variables.end(); ++i)
        {
@@ -259,11 +265,16 @@ void UnusedVariableRemover::visit(VariableReference &var)
        if(var.declaration && !assignment_target)
        {
                VariableInfo &var_info = variables.back()[var.declaration];
-               var_info.assignments.clear();
+               clear_assignments(var_info, false);
                var_info.referenced = true;
        }
 }
 
+void UnusedVariableRemover::visit(InterfaceBlockReference &iface)
+{
+       unused_nodes.erase(iface.declaration);
+}
+
 void UnusedVariableRemover::visit(MemberAccess &memacc)
 {
        TraversingVisitor::visit(memacc);
@@ -436,7 +447,7 @@ void UnusedVariableRemover::visit(Iteration &iter)
        BlockVariableMap &block_variables = variables.back();
        for(BlockVariableMap::iterator i=block_variables.begin(); i!=block_variables.end(); ++i)
                if(!i->second.local && i->second.referenced)
-                       i->second.assignments.clear();
+                       clear_assignments(i->second, false);
 
        merge_down_variables();
 }
@@ -444,7 +455,7 @@ void UnusedVariableRemover::visit(Iteration &iter)
 
 bool UnusedFunctionRemover::apply(Stage &stage)
 {
-       visit(stage.content);
+       stage.content.visit(*this);
        NodeRemover().apply(stage, unused_nodes);
        return !unused_nodes.empty();
 }