From 9e92b9b89919a3b63ffed9fada922ada9058b0dd Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 14 Mar 2002 16:42:43 +0000
Subject: [PATCH] Added a TextureCallback which cycles through various filter
 modes, used in testing new glTextParamters update functionality.  I have
 commented out the call to attaching of the callback so osgtexture outwardly
 behaves as before.  The code lies dormant just incase we need to use it for
 testing in the future.

---
 src/Demos/osgtexture/osgtexture.cpp | 43 +++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/src/Demos/osgtexture/osgtexture.cpp b/src/Demos/osgtexture/osgtexture.cpp
index aaa480bb7..e10c0795d 100644
--- a/src/Demos/osgtexture/osgtexture.cpp
+++ b/src/Demos/osgtexture/osgtexture.cpp
@@ -23,6 +23,47 @@
 
 typedef std::vector< osg::ref_ptr<osg::Image> > ImageList;
 
+class TextureCallback : public osg::NodeCallback
+{
+    public:
+        TextureCallback(osg::Texture* texture):_texture(texture)
+        {
+            _filterRange.push_back(osg::Texture::LINEAR);
+            _filterRange.push_back(osg::Texture::LINEAR_MIPMAP_LINEAR);
+            _filterRange.push_back(osg::Texture::LINEAR_MIPMAP_NEAREST);
+            _filterRange.push_back(osg::Texture::NEAREST);
+            _filterRange.push_back(osg::Texture::NEAREST_MIPMAP_LINEAR);
+            _filterRange.push_back(osg::Texture::NEAREST_MIPMAP_NEAREST);
+	    _filterRange.push_back(osg::Texture::ANISOTROPIC);
+            _currPos = 0;
+            _prevTime = 0.0;
+        }
+        
+        virtual ~TextureCallback() {}
+        
+        virtual void operator()(osg::Node*, osg::NodeVisitor* nv)
+        {
+            if (nv->getFrameStamp())
+            {
+                double currTime = nv->getFrameStamp()->getReferenceTime();
+                if (currTime-_prevTime>1.0) 
+                {
+                    std::cout<<"Updating texturing filter to "<<hex<<_filterRange[_currPos]<<dec<<std::endl;
+                    _texture->setFilter(osg::Texture::MAG_FILTER,_filterRange[_currPos]);
+                    _currPos++;
+                    if (_currPos>=_filterRange.size()) _currPos=0;                    
+                    _prevTime = currTime;
+                }
+            }
+        }
+        
+        osg::ref_ptr<osg::Texture>              _texture;
+        std::vector<osg::Texture::FilterMode>   _filterRange;
+        osg::uint                               _currPos;
+        double                                  _prevTime;
+};
+
+
 /**
   * Function to read several images files (typically one) as specified 
   * on the command line, and return them in an ImageList
@@ -134,6 +175,8 @@ osg::Node* createLayer(const osg::Vec3& offset,osg::Image* image,osg::Node* geom
         top_transform->addChild(createTexturedItem(local_offset,texture,geometry));
 
         local_offset += local_delta;
+        
+        // top_transform->setAppCallback(new TextureCallback(texture));
 
     }