From 4adb68c802e0beaf8bed2d1c0cf00a8bebe874b7 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 18 Aug 2008 14:49:16 +0000
Subject: [PATCH] Added BlendEquation .osg support

---
 src/osgPlugins/osg/BlendEquation.cpp | 84 ++++++++++++++++++++++++++++
 src/osgPlugins/osg/CMakeLists.txt    |  1 +
 2 files changed, 85 insertions(+)
 create mode 100644 src/osgPlugins/osg/BlendEquation.cpp

diff --git a/src/osgPlugins/osg/BlendEquation.cpp b/src/osgPlugins/osg/BlendEquation.cpp
new file mode 100644
index 000000000..7cde67972
--- /dev/null
+++ b/src/osgPlugins/osg/BlendEquation.cpp
@@ -0,0 +1,84 @@
+#include "osg/BlendEquation"
+
+#include "osgDB/Registry"
+#include "osgDB/Input"
+#include "osgDB/Output"
+
+using namespace osg;
+using namespace osgDB;
+
+// forward declare functions to use later.
+bool BlendEquation_readLocalData(Object& obj, Input& fr);
+bool BlendEquation_writeLocalData(const Object& obj, Output& fw);
+
+bool BlendEquation_matchModeStr(const char* str,int& mode);
+const char* BlendEquation_getModeStr(int value);
+
+// register the read and write functions with the osgDB::Registry.
+RegisterDotOsgWrapperProxy g_BlendEquationProxy
+(
+    new osg::BlendEquation,
+    "BlendEquation",
+    "Object StateAttribute BlendEquation",
+    &BlendEquation_readLocalData,
+    &BlendEquation_writeLocalData
+);
+
+bool BlendEquation_readLocalData(Object& obj, Input& fr)
+{
+    bool iteratorAdvanced = false;
+
+    BlendEquation& transparency = static_cast<BlendEquation&>(obj);
+
+    int mode;
+    if (fr[0].matchWord("equation") && BlendEquation_matchModeStr(fr[1].getStr(),mode))
+    {
+        transparency.setEquation(osg::BlendEquation::Equation(mode));
+        fr+=2;
+        iteratorAdvanced = true;
+    }
+
+    return iteratorAdvanced;
+}
+
+bool BlendEquation_writeLocalData(const Object& obj, Output& fw)
+{
+    const BlendEquation& transparency = static_cast<const BlendEquation&>(obj);
+
+    fw.indent() << "equation " << BlendEquation_getModeStr(transparency.getEquation()) << std::endl;
+
+    return true;
+}
+
+
+
+bool BlendEquation_matchModeStr(const char* str,int& mode)
+{
+    if (strcmp(str,"RGBA_MIN")==0)                      mode = BlendEquation::RGBA_MIN;
+    else if (strcmp(str,"RGBA_MAX")==0)                 mode = BlendEquation::RGBA_MAX;
+    else if (strcmp(str,"ALPHA_MIN")==0)                mode = BlendEquation::ALPHA_MIN;
+    else if (strcmp(str,"ALPHA_MAX")==0)                mode = BlendEquation::ALPHA_MAX;
+    else if (strcmp(str,"LOGIC_OP")==0)                 mode = BlendEquation::LOGIC_OP;
+    else if (strcmp(str,"FUNC_ADD")==0)                 mode = BlendEquation::FUNC_ADD;
+    else if (strcmp(str,"FUNC_SUBTRACT")==0)            mode = BlendEquation::FUNC_SUBTRACT;
+    else if (strcmp(str,"FUNC_REVERSE_SUBTRACT")==0)    mode = BlendEquation::FUNC_REVERSE_SUBTRACT;
+    else return false;
+    return true;
+
+}
+const char* BlendEquation_getModeStr(int value)
+{
+    switch(value)
+    {
+        case(BlendEquation::RGBA_MIN) :                 return "RGBA_MIN";
+        case(BlendEquation::RGBA_MAX) :                 return "RGBA_MAX";
+        case(BlendEquation::ALPHA_MIN) :                return "ALPHA_MIN";
+        case(BlendEquation::ALPHA_MAX) :                return "ALPHA_MAX";
+        case(BlendEquation::LOGIC_OP) :                 return "LOGIC_OP";
+        case(BlendEquation::FUNC_ADD) :                 return "FUNC_ADD";
+        case(BlendEquation::FUNC_SUBTRACT) :            return "FUNC_SUBTRACT";
+        case(BlendEquation::FUNC_REVERSE_SUBTRACT) :    return "FUNC_REVERSE_SUBTRACT";
+    }
+
+    return NULL;
+}
diff --git a/src/osgPlugins/osg/CMakeLists.txt b/src/osgPlugins/osg/CMakeLists.txt
index 3428fae72..3ff51b4e6 100644
--- a/src/osgPlugins/osg/CMakeLists.txt
+++ b/src/osgPlugins/osg/CMakeLists.txt
@@ -8,6 +8,7 @@ AutoTransform.cpp
 Billboard.cpp
 BlendColor.cpp
 BlendFunc.cpp
+BlendEquation.cpp
 Camera.cpp
 CameraView.cpp
 ClearNode.cpp