X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;ds=sidebyside;f=source%2Fglsl%2Fgenerate.cpp;h=2ac37a6ffae788a16c6cc367dbcf53b9fdb61dcb;hb=6288c42adde9ee7d39a47de51fa2856cf965dccc;hp=42226a912396171faf0287b4062cbee19fbe5a40;hpb=7f29c6d2a4eee36538d7ccf24980e749592e2444;p=libs%2Fgl.git

diff --git a/source/glsl/generate.cpp b/source/glsl/generate.cpp
index 42226a91..2ac37a6f 100644
--- a/source/glsl/generate.cpp
+++ b/source/glsl/generate.cpp
@@ -1,4 +1,6 @@
+#include <msp/core/hash.h>
 #include <msp/core/raii.h>
+#include <msp/strings/lexicalcast.h>
 #include "builtin.h"
 #include "generate.h"
 
@@ -73,6 +75,59 @@ void DeclarationCombiner::visit(VariableDeclaration &var)
 }
 
 
+ConstantSpecializer::ConstantSpecializer():
+	values(0)
+{ }
+
+void ConstantSpecializer::apply(Stage &stage, const map<string, int> *v)
+{
+	values = v;
+	stage.content.visit(*this);
+}
+
+void ConstantSpecializer::visit(VariableDeclaration &var)
+{
+	bool specializable = false;
+	if(var.layout)
+	{
+		vector<Layout::Qualifier> &qualifiers = var.layout->qualifiers;
+		for(vector<Layout::Qualifier>::iterator i=qualifiers.begin(); i!=qualifiers.end(); ++i)
+			if(i->name=="constant_id")
+			{
+				specializable = true;
+				if(values)
+					qualifiers.erase(i);
+				else if(i->value==-1)
+					i->value = hash32(var.name)&0x7FFFFFFF;
+				break;
+			}
+
+		if(qualifiers.empty())
+			var.layout = 0;
+	}
+
+	if(specializable && values)
+	{
+		map<string, int>::const_iterator i = values->find(var.name);
+		if(i!=values->end())
+		{
+			RefPtr<Literal> literal = new Literal;
+			if(var.type=="bool")
+			{
+				literal->token = (i->second ? "true" : "false");
+				literal->value = static_cast<bool>(i->second);
+			}
+			else if(var.type=="int")
+			{
+				literal->token = lexical_cast<string>(i->second);
+				literal->value = i->second;
+			}
+			var.init_expression = literal;
+		}
+	}
+}
+
+
 void BlockResolver::enter(Block &block)
 {
 	block.parent = current_block;