From 448efe07228fd772603771907c0f489b512122da Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 4 Jun 2007 10:47:15 +0000
Subject: [PATCH] Added osg::Hint class

---
 include/osg/Hint           | 76 ++++++++++++++++++++++++++++++++++++++
 include/osg/StateAttribute |  4 +-
 src/osg/CMakeLists.txt     |  2 +
 src/osg/Hint.cpp           | 23 ++++++++++++
 4 files changed, 104 insertions(+), 1 deletion(-)
 create mode 100644 include/osg/Hint
 create mode 100644 src/osg/Hint.cpp

diff --git a/include/osg/Hint b/include/osg/Hint
new file mode 100644
index 000000000..3c236df94
--- /dev/null
+++ b/include/osg/Hint
@@ -0,0 +1,76 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSG_HINT
+#define OSG_HINT 1
+
+#include <osg/StateAttribute>
+
+namespace osg
+{
+
+class OSG_EXPORT Hint : public StateAttribute
+{
+public:
+
+        Hint():
+            _target(GL_NONE),
+            _mode(GL_NONE) {}
+
+        Hint(GLenum target, GLenum mode):
+            _target(target),
+            _mode(mode) {}
+
+        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
+        Hint(const Hint& hint,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
+            StateAttribute(hint,copyop),
+            _target(hint._target),
+            _mode(hint._mode) {}
+
+        META_StateAttribute(osg, Hint, HINT);
+
+        virtual int compare(const StateAttribute& sa) const
+        {
+	    // check the types are equal and then create the rhs variable
+	    // used by the COMPARE_StateAttribute_Parameter macro's below.
+	    COMPARE_StateAttribute_Types(Hint,sa)
+
+            // compare each paramter in turn against the rhs.
+            COMPARE_StateAttribute_Parameter(_target)
+            COMPARE_StateAttribute_Parameter(_mode)
+            
+            return 0;
+        }
+
+        /** Return the member identifier within the attribute's class type. Used for light number/clip plane number etc.*/
+        virtual unsigned int getMember() const { return static_cast<unsigned int>(_target); }
+        
+        inline void setTarget(GLenum target) { _target = target;  }
+        inline GLenum getTarget() const { return _target;  }
+        
+        inline void setMode(GLenum mode) { _mode = mode; }
+        inline GLenum getMode() const { return _mode; }
+
+        virtual void apply(State& state) const;
+
+protected:
+
+        
+        GLenum _target;
+        GLenum _mode;
+};
+
+
+}
+
+#endif
diff --git a/include/osg/StateAttribute b/include/osg/StateAttribute
index daa9e424c..a6bd34217 100644
--- a/include/osg/StateAttribute
+++ b/include/osg/StateAttribute
@@ -159,6 +159,7 @@ class OSG_EXPORT StateAttribute : public Object
             POINTSPRITE,
             PROGRAM,
             CLAMPCOLOR,
+            HINT,
 
             /// osgFX namespace
             VALIDATOR,
@@ -179,7 +180,8 @@ class OSG_EXPORT StateAttribute : public Object
             OSGNVSLANG_PROGRAM,
 
             // osgNVParse
-            OSGNVPARSE_PROGRAM_PARSER
+            OSGNVPARSE_PROGRAM_PARSER,
+            
 
         };
         
diff --git a/src/osg/CMakeLists.txt b/src/osg/CMakeLists.txt
index 44be3c3f8..c81192aba 100644
--- a/src/osg/CMakeLists.txt
+++ b/src/osg/CMakeLists.txt
@@ -65,6 +65,7 @@ SET(LIB_PUBLIC_HEADERS
 	${HEADER_PATH}/GraphicsContext
 	${HEADER_PATH}/GraphicsThread
 	${HEADER_PATH}/Group
+	${HEADER_PATH}/Hint
 	${HEADER_PATH}/Image
 	${HEADER_PATH}/ImageStream
 	${HEADER_PATH}/LOD
@@ -215,6 +216,7 @@ ADD_LIBRARY(${LIB_NAME}
 	GraphicsContext.cpp
 	GraphicsThread.cpp
 	Group.cpp
+	Hint.cpp
 	Image.cpp
 	ImageStream.cpp
 	LOD.cpp
diff --git a/src/osg/Hint.cpp b/src/osg/Hint.cpp
new file mode 100644
index 000000000..043c8356e
--- /dev/null
+++ b/src/osg/Hint.cpp
@@ -0,0 +1,23 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osg/Hint>
+
+using namespace osg;
+
+void Hint::apply(State& state) const
+{
+    if (_target==GL_NONE || _mode==GL_NONE) return;
+    
+    glHint(_target, _mode);
+}