From 3edb8a3d186733cf3f5775c45f852b80e0e90272 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 12 Jul 2002 10:30:27 +0000
Subject: [PATCH] Added blend color to osg::TexEnv

---
 include/osg/TexEnv            | 17 ++++++++++++++---
 src/osg/TexEnv.cpp            | 15 +++++----------
 src/osgPlugins/osg/TexEnv.cpp | 26 ++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 13 deletions(-)

diff --git a/include/osg/TexEnv b/include/osg/TexEnv
index 1e91ae5ff..b98f0e5d7 100644
--- a/include/osg/TexEnv
+++ b/include/osg/TexEnv
@@ -7,6 +7,7 @@
 
 #include <osg/GL>
 #include <osg/StateAttribute>
+#include <osg/Vec4>
 
 namespace osg {
 
@@ -20,7 +21,8 @@ class SG_EXPORT TexEnv : public StateAttribute
         /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
         TexEnv(const TexEnv& texenv,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
             StateAttribute(texenv,copyop),
-            _mode(texenv._mode) {}
+            _mode(texenv._mode),
+            _color(texenv._color) {}
 
 
         META_StateAttribute(osg, TexEnv, TEXENV);
@@ -36,6 +38,7 @@ class SG_EXPORT TexEnv : public StateAttribute
 
             // compare each paramter in turn against the rhs.
             COMPARE_StateAttribute_Parameter(_mode)
+            COMPARE_StateAttribute_Parameter(_color)
 
             return 0; // passed all the above comparison macro's, must be equal.
         }
@@ -47,17 +50,25 @@ class SG_EXPORT TexEnv : public StateAttribute
             REPLACE   = GL_REPLACE
         };
 
-        void setMode( const Mode mode );
+        void setMode( const Mode mode ) { _mode = mode; }
         
         const Mode getMode() const { return _mode; }
         
+        void setColor( const Vec4& color ) { _color = color; }
+        
+        Vec4& getColor() { return _color; }
+
+        const Vec4& getColor() const { return _color; }
+
+
         virtual void apply(State& state) const;
 
     protected :
 
         virtual ~TexEnv( void );
 
-        Mode _mode;
+        Mode        _mode;
+        osg::Vec4   _color;
 };
 
 }
diff --git a/src/osg/TexEnv.cpp b/src/osg/TexEnv.cpp
index ed079552b..28a1082f4 100644
--- a/src/osg/TexEnv.cpp
+++ b/src/osg/TexEnv.cpp
@@ -5,6 +5,7 @@ using namespace osg;
 TexEnv::TexEnv()
 {
     _mode = MODULATE;
+    _color.set(0.0f,0.0f,0.0f,0.0f);
 }
 
 
@@ -12,17 +13,11 @@ TexEnv::~TexEnv()
 {
 }
 
-void TexEnv::setMode( const Mode mode )
-{
-    _mode = (mode == DECAL ||
-        mode == MODULATE ||
-        mode == BLEND ||
-        mode == REPLACE ) ?
-        mode : MODULATE;
-}
-
-
 void TexEnv::apply(State&) const
 {
     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, _mode);
+    if (_mode==TexEnv::BLEND)
+    {
+        glTexEnvfv( GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, _color.ptr());
+    }
 }
diff --git a/src/osgPlugins/osg/TexEnv.cpp b/src/osgPlugins/osg/TexEnv.cpp
index 4eaed2cfc..aa042899b 100644
--- a/src/osgPlugins/osg/TexEnv.cpp
+++ b/src/osgPlugins/osg/TexEnv.cpp
@@ -38,6 +38,20 @@ bool TexEnv_readLocalData(Object& obj, Input& fr)
         iteratorAdvanced = true;
     }
 
+    if (fr.matchSequence("color %f %f %f %f"))
+    {
+        osg::Vec4 color;
+        fr[1].getFloat(color[0]);
+        fr[2].getFloat(color[1]);
+        fr[3].getFloat(color[2]);
+        fr[4].getFloat(color[3]);
+    
+        texenv.setColor(color);
+        
+        fr+=5;
+        iteratorAdvanced = true;
+    }
+
     return iteratorAdvanced;
 }
 
@@ -46,6 +60,18 @@ bool TexEnv_writeLocalData(const Object& obj, Output& fw)
     const TexEnv& texenv = static_cast<const TexEnv&>(obj);
 
     fw.indent() << "mode " << TexEnv_getModeStr(texenv.getMode()) << std::endl;
+    
+    switch(texenv.getMode())
+    {
+        case(TexEnv::DECAL):
+        case(TexEnv::MODULATE):
+        case(TexEnv::REPLACE):
+            break;
+        case(TexEnv::BLEND):
+        default:
+            fw.indent() << "color " << texenv.getColor() << std::endl;
+            break;
+    }
 
     return true;
 }