Added beginnings of shader composition with the shells of the ShaderComposer and ShaderAttribute classes. This aren't

functional yet, but a useful placeholders for future fucntionality.

src/osg/ShaderAttribute.cpp

@@ -0,0 +1,118 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2004 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/ShaderAttribute>
+#include <osg/Notify>
+
+using namespace osg;
+
+
+ShaderAttribute::ShaderAttribute()
+{
+}
+
+ShaderAttribute::ShaderAttribute(const ShaderAttribute& sa,const CopyOp& copyop):
+    StateAttribute(sa,copyop),
+    _type(sa._type)
+{
+}
+
+ShaderAttribute::~ShaderAttribute()
+{
+}
+
+int ShaderAttribute::compare(const StateAttribute& sa) const
+{
+    // check the types are equal and then create the rhs variable
+    // used by the COMPARE_StateAttribute_Parameter macros below.
+    COMPARE_StateAttribute_Types(ShaderAttribute,sa)
+
+    // check if types are same
+    if (_type < rhs._type) return -1;
+    if (_type > rhs._type) return 1;
+
+    // all properties are the equal so return 0.
+    return 0;
+}
+
+void ShaderAttribute::setType(Type type)
+{
+    _type = type;
+}
+
+unsigned int ShaderAttribute::addShader(Shader* shader)
+{
+    // check to see if shader already add, if so return the index of it
+    for(unsigned int i=0; i<_shaders.size(); ++i)
+    {
+        if (_shaders[i] == shader) return i;
+    }
+
+    // add shader and return it's position
+    _shaders.push_back(shader);
+    return _shaders.size()-1;
+}
+
+void ShaderAttribute::removeShader(unsigned int i)
+{
+    _shaders.erase(_shaders.begin()+i);
+}
+
+unsigned int ShaderAttribute::addUniform(Uniform* uniform)
+{
+    // check to see if uniform already add, if so return the index of it
+    for(unsigned int i=0; i<_uniforms.size(); ++i)
+    {
+        if (_uniforms[i] == uniform) return i;
+    }
+
+    // add uniform and return it's position
+    _uniforms.push_back(uniform);
+    return _uniforms.size()-1;
+}
+
+void ShaderAttribute::removeUniform(unsigned int i)
+{
+    _uniforms.erase(_uniforms.begin()+i);
+}
+
+bool ShaderAttribute::getModeUsage(StateAttribute::ModeUsage& usage) const
+{
+    OSG_NOTICE<<"ShaderAttribute::getModeUsage(..)"<<std::endl;
+    return false;
+}
+
+void ShaderAttribute::apply(State& state) const
+{
+    OSG_NOTICE<<"ShaderAttribute::apply(..)"<<std::endl;
+}
+
+void ShaderAttribute::compose(ShaderComposer& composer) const
+{
+    OSG_NOTICE<<"ShaderAttribute::compose(..)"<<std::endl;
+}
+
+void ShaderAttribute::compileGLObjects(State&) const
+{
+    OSG_NOTICE<<"ShaderAttribute::compileGLObjects(..)"<<std::endl;
+}
+
+void ShaderAttribute::resizeGLObjectBuffers(unsigned int maxSize)
+{
+    OSG_NOTICE<<"ShaderAttribute::resizeGLObjectBuffers(..)"<<std::endl;
+}
+
+void ShaderAttribute::releaseGLObjects(State* state) const
+{
+    OSG_NOTICE<<"ShaderAttribute::releaseGLObjects(..)"<<std::endl;
+}