Implement an import system

[libs/gl.git] / source / programcompiler.cpp

diff --git a/source/programcompiler.cpp b/source/programcompiler.cpp
index 63939409fc4c7d28c6f38cc031925cacb919257f..82a324dec52d8e7c9e92b8d8c56cb15264e423f3 100644 (file)
--- a/source/programcompiler.cpp
+++ b/source/programcompiler.cpp
@@ -4,6 +4,7 @@
 #include "error.h"
 #include "program.h"
 #include "programcompiler.h"
+#include "resources.h"
 #include "shader.h"
 
 using namespace std;
@@ -34,17 +35,20 @@ namespace GL {
 using namespace ProgramSyntax;
 
 ProgramCompiler::ProgramCompiler():
+       resources(0),
        module(0)
 { }
 
 void ProgramCompiler::compile(const string &source)
 {
+       resources = 0;
        module = &parser.parse(source);
        process();
 }
 
-void ProgramCompiler::compile(IO::Base &io)
+void ProgramCompiler::compile(IO::Base &io, Resources *res)
 {
+       resources = res;
        module = &parser.parse(io);
        process();
 }
@@ -102,6 +106,11 @@ Stage *ProgramCompiler::get_builtins(StageType type)
 
 void ProgramCompiler::process()
 {
+       list<Import *> imports = apply<NodeGatherer<Import> >(module->shared);
+       for(list<Import *>::iterator i=imports.end(); i!=imports.begin(); )
+               import((*--i)->module);
+       apply<NodeRemover>(module->shared, set<Node *>(imports.begin(), imports.end()));
+
        for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
                generate(*i);
        for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); )
@@ -113,6 +122,39 @@ void ProgramCompiler::process()
        }
 }
 
+void ProgramCompiler::import(const string &name)
+{
+       if(!resources)
+               throw runtime_error("no resources");
+       RefPtr<IO::Seekable> io = resources->open_raw(name+".glsl");
+       if(!io)
+               throw runtime_error(format("module %s not found", name));
+       ProgramParser import_parser;
+       Module &imported_module = import_parser.parse(*io);
+
+       inject_block(module->shared.content, imported_module.shared.content);
+       apply<DeclarationCombiner>(module->shared);
+       for(list<Stage>::iterator i=imported_module.stages.begin(); i!=imported_module.stages.end(); ++i)
+       {
+               list<Stage>::iterator j;
+               for(j=module->stages.begin(); (j!=module->stages.end() && j->type<i->type); ++j) ;
+               if(j==module->stages.end() || j->type>i->type)
+               {
+                       j = module->stages.insert(j, *i);
+                       list<Stage>::iterator k = j;
+                       if(++k!=module->stages.end())
+                               k->previous = &*j;
+                       if(j!=module->stages.begin())
+                               j->previous = &*--(k=j);
+               }
+               else
+               {
+                       inject_block(j->content, i->content);
+                       apply<DeclarationCombiner>(*j);
+               }
+       }
+}
+
 void ProgramCompiler::generate(Stage &stage)
 {
        inject_block(stage.content, module->shared.content);
@@ -262,6 +304,11 @@ void ProgramCompiler::Formatter::visit(Block &block)
                formatted += format("\n%s}", string(brace_indent*2, ' '));
 }
 
+void ProgramCompiler::Formatter::visit(Import &import)
+{
+       formatted += format("import %s;", import.module);
+}
+
 void ProgramCompiler::Formatter::visit(Layout &layout)
 {
        formatted += "layout(";
@@ -327,7 +374,7 @@ void ProgramCompiler::Formatter::visit(FunctionDeclaration &func)
                (*i)->visit(*this);
        }
        formatted += ')';
-       if(func.definition)
+       if(func.definition==&func)
        {
                formatted += '\n';
                func.body.visit(*this);
@@ -376,6 +423,56 @@ void ProgramCompiler::Formatter::visit(Return &ret)
 }
 
 
+ProgramCompiler::DeclarationCombiner::DeclarationCombiner():
+       toplevel(true),
+       remove_node(false)
+{ }
+
+void ProgramCompiler::DeclarationCombiner::visit(Block &block)
+{
+       if(!toplevel)
+               return;
+
+       SetForScope<bool> set(toplevel, false);
+       for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
+       {
+               remove_node = false;
+               (*i)->visit(*this);
+               if(remove_node)
+                       block.body.erase(i++);
+               else
+                       ++i;
+       }
+}
+
+void ProgramCompiler::DeclarationCombiner::visit(FunctionDeclaration &func)
+{
+       vector<FunctionDeclaration *> &decls = functions[func.name];
+       if(func.definition)
+       {
+               for(vector<FunctionDeclaration *>::iterator i=decls.begin(); i!=decls.end(); ++i)
+               {
+                       (*i)->definition = func.definition;
+                       (*i)->body.body.clear();
+               }
+       }
+       decls.push_back(&func);
+}
+
+void ProgramCompiler::DeclarationCombiner::visit(VariableDeclaration &var)
+{
+       VariableDeclaration *&ptr = variables[var.name];
+       if(ptr)
+       {
+               if(var.init_expression)
+                       ptr->init_expression = var.init_expression;
+               remove_node = true;
+       }
+       else
+               ptr = &var;
+}
+
+
 ProgramCompiler::VariableResolver::VariableResolver():
        anonymous(false),
        record_target(false),