+void ProgramCompiler::NodeRemover::visit(Iteration &iter)
+{
+ if(to_remove.count(iter.init_statement.get()))
+ iter.init_statement = 0;
+ TraversingVisitor::visit(iter);
+}
+
+
+void ProgramCompiler::PrecisionRemover::visit(Precision &)
+{
+ remove_node = true;
+}
+
+void ProgramCompiler::PrecisionRemover::visit(VariableDeclaration &var)
+{
+ var.precision.clear();
+}
+
+
+ProgramCompiler::DefaultPrecisionGenerator::DefaultPrecisionGenerator():
+ toplevel(true)
+{ }
+
+void ProgramCompiler::DefaultPrecisionGenerator::visit(Block &block)
+{
+ if(toplevel)
+ {
+ SetForScope<bool> set(toplevel, false);
+ BlockModifier::visit(block);
+ }
+ else
+ Visitor::visit(block);
+}
+
+void ProgramCompiler::DefaultPrecisionGenerator::visit(Precision &prec)
+{
+ have_default.insert(prec.type);
+}
+
+void ProgramCompiler::DefaultPrecisionGenerator::visit(VariableDeclaration &var)
+{
+ if(var.type_declaration)
+ return;
+
+ string type = var.type;
+ if(!type.compare(0, 3, "vec") || !type.compare(0, 3, "mat"))
+ type = "float";
+ else if(!type.compare(0, 3, "ivec") || type=="uint")
+ type = "int";
+
+ if(!have_default.count(type))
+ {
+ Precision *prec = new Precision;
+ if(!type.compare(0, 7, "sampler"))
+ prec->precision = "lowp";
+ else if(stage->type==FRAGMENT)
+ prec->precision = "mediump";
+ else
+ prec->precision = "highp";
+ prec->type = type;
+ insert_nodes.push_back(prec);
+
+ have_default.insert(type);
+ }
+}
+
+
+ProgramCompiler::LegacyConverter::LegacyConverter():
+ target_api(get_gl_api()),
+ target_version(get_glsl_version()),
+ frag_out(0)
+{ }
+
+ProgramCompiler::LegacyConverter::LegacyConverter(const Version &v):
+ target_api(get_gl_api()),
+ target_version(v),
+ frag_out(0)
+{ }
+
+bool ProgramCompiler::LegacyConverter::check_version(const Version &feature_version) const
+{
+ if(target_version<feature_version)
+ return false;
+ else if(stage->required_version<feature_version)
+ stage->required_version = feature_version;
+
+ return true;
+}
+
+bool ProgramCompiler::LegacyConverter::check_extension(const Extension &extension) const
+{
+ if(!extension)
+ return false;
+
+ vector<const Extension *>::iterator i = find(stage->required_extensions, &extension);
+ if(i==stage->required_extensions.end())
+ stage->required_extensions.push_back(&extension);
+
+ return true;
+}
+
+bool ProgramCompiler::LegacyConverter::supports_unified_interface_syntax() const
+{
+ if(target_api==OPENGL_ES2)
+ return check_version(Version(3, 0));
+ else
+ return check_version(Version(1, 30));
+}
+
+void ProgramCompiler::LegacyConverter::visit(VariableReference &var)
+{
+ if(var.declaration==frag_out && !supports_unified_interface_syntax())
+ {
+ var.name = "gl_FragColor";
+ var.declaration = 0;
+ type = "vec4";
+ }
+ else if(var.declaration)
+ type = var.declaration->type;
+ else
+ type = string();
+}
+
+void ProgramCompiler::LegacyConverter::visit(Assignment &assign)
+{
+ TraversingVisitor::visit(assign);
+ if(assign.target_declaration==frag_out && !supports_unified_interface_syntax())
+ assign.target_declaration = 0;
+}
+
+bool ProgramCompiler::LegacyConverter::supports_unified_sampling_functions() const
+{
+ if(target_api==OPENGL_ES2)
+ return check_version(Version(3, 0));
+ else
+ return check_version(Version(1, 30));
+}
+
+void ProgramCompiler::LegacyConverter::visit(FunctionCall &call)
+{
+ if(call.name=="texture" && !call.declaration && !supports_unified_sampling_functions())
+ {
+ NodeArray<Expression>::iterator i = call.arguments.begin();
+ if(i!=call.arguments.end())
+ {
+ (*i)->visit(*this);
+ if(type=="sampler1D")
+ call.name = "texture1D";
+ else if(type=="sampler2D")
+ call.name = "texture2D";
+ else if(type=="sampler3D")
+ call.name = "texture3D";
+ else if(type=="samplerCube")
+ call.name = "textureCube";
+ else if(type=="sampler1DShadow")
+ call.name = "shadow1D";
+ else if(type=="sampler2DShadow")
+ call.name = "shadow2D";
+ else if(type=="sampler1DArray")
+ {
+ check_extension(EXT_texture_array);
+ call.name = "texture1DArray";
+ }
+ else if(type=="sampler2DArray")
+ {
+ check_extension(EXT_texture_array);
+ call.name = "texture2DArray";
+ }
+ else if(type=="sampler1DArrayShadow")
+ {
+ check_extension(EXT_texture_array);
+ call.name = "shadow1DArray";
+ }
+ else if(type=="sampler2DArrayShadow")
+ {
+ check_extension(EXT_texture_array);
+ call.name = "shadow2DArray";
+ }
+
+ for(; i!=call.arguments.end(); ++i)
+ (*i)->visit(*this);
+ }
+ }
+ else
+ TraversingVisitor::visit(call);
+}
+
+bool ProgramCompiler::LegacyConverter::supports_interface_layouts() const
+{
+ if(target_api==OPENGL_ES2)
+ return check_version(Version(3, 0));
+ else if(check_version(Version(3, 30)))
+ return true;
+ else
+ return check_extension(ARB_explicit_attrib_location);
+}
+
+bool ProgramCompiler::LegacyConverter::supports_centroid_sampling() const
+{
+ if(target_api==OPENGL_ES2)
+ return check_version(Version(3, 0));
+ else if(check_version(Version(1, 20)))
+ return true;
+ else
+ return check_extension(EXT_gpu_shader4);
+}
+
+bool ProgramCompiler::LegacyConverter::supports_sample_sampling() const
+{
+ if(target_api==OPENGL_ES2)
+ return check_version(Version(3, 20));
+ else if(check_version(Version(4, 0)))
+ return true;
+ else
+ return check_extension(ARB_gpu_shader5);
+}
+
+void ProgramCompiler::LegacyConverter::visit(VariableDeclaration &var)
+{
+ if(var.layout && !supports_interface_layouts())
+ {
+ vector<Layout::Qualifier>::iterator i;
+ for(i=var.layout->qualifiers.begin(); (i!=var.layout->qualifiers.end() && i->identifier!="location"); ++i) ;
+ if(i!=var.layout->qualifiers.end())
+ {
+ unsigned location = lexical_cast<unsigned>(i->value);
+ if(stage->type==VERTEX && var.interface=="in")
+ {
+ stage->locations[var.name] = location;
+ var.layout->qualifiers.erase(i);
+ }
+ else if(stage->type==FRAGMENT && var.interface=="out")
+ {
+ if(location!=0)
+ static Require _req(EXT_gpu_shader4);
+ stage->locations[var.name] = location;
+ var.layout->qualifiers.erase(i);
+ }
+
+ if(var.layout->qualifiers.empty())
+ var.layout = 0;
+ }
+ }
+
+ if(var.sampling=="centroid")
+ {
+ if(!supports_centroid_sampling())
+ var.sampling = string();
+ }
+ else if(var.sampling=="sample")
+ {
+ if(!supports_sample_sampling())
+ var.sampling = string();
+ }
+
+ if((var.interface=="in" || var.interface=="out") && !supports_unified_interface_syntax())
+ {
+ if(stage->type==FRAGMENT && var.interface=="out")
+ {
+ frag_out = &var;
+ remove_node = true;
+ }
+ }
+
+ TraversingVisitor::visit(var);
+}
+
+bool ProgramCompiler::LegacyConverter::supports_interface_blocks(const string &iface) const
+{
+ if(target_api==OPENGL_ES2)
+ {
+ if(iface=="uniform")
+ return check_version(Version(3, 0));
+ else
+ return check_version(Version(3, 20));
+ }
+ else if(check_version(Version(1, 50)))
+ return true;
+ else if(iface=="uniform")
+ return check_extension(ARB_uniform_buffer_object);
+ else
+ return false;
+}
+
+void ProgramCompiler::LegacyConverter::visit(InterfaceBlock &iface)
+{
+ if(!supports_interface_blocks(iface.interface))
+ flatten_block(iface.members);
+}
+