Add bool uniforms

libs/gfx/include/psemek/gfx/program.hpp

@@ -34,6 +34,7 @@ namespace psemek::gfx
 
 			GLint location() const { return location_; }
 
+			void operator = (bool b);
 			void operator = (int i);
 			void operator = (unsigned int i);
 			void operator = (float f);

libs/gfx/source/program.cpp

@@ -9,6 +9,11 @@
 namespace psemek::gfx
 {
 
+	void program::uniform_proxy::operator = (bool b)
+	{
+		gl::Uniform1i(location_, b ? 1 : 0);
+	}
+
 	void program::uniform_proxy::operator = (int i)
 	{
 		gl::Uniform1i(location_, i);