From Marcus Hein, Added support for OpenGL SSBO and SSBB via osg::ShaderStorageBufferObject and osg::ShaderStorageBufferBinding to core OSG library, and added new osgSSBO example

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14599 16af8721-9629-0410-8352-f15c8da7e697

include/osg/BufferIndexBinding

@@ -164,6 +164,35 @@ class OSG_EXPORT AtomicCounterBufferBinding : public BufferIndexBinding
     }
 };
 
+class OSG_EXPORT ShaderStorageBufferBinding : public BufferIndexBinding
+{
+ public:
+    ShaderStorageBufferBinding(GLuint index=0);
+    /** Create a binding for a shader storage buffer index target.
+     *  @param index the index target
+     *  @param bo associated buffer object
+     *  @param offset offset into buffer object
+     *  @param size size of data in buffer object
+     */
+    ShaderStorageBufferBinding(GLuint index, BufferObject* bo, GLintptr offset, GLsizeiptr size);
+    ShaderStorageBufferBinding(const ShaderStorageBufferBinding& rhs, const CopyOp& copyop=CopyOp::SHALLOW_COPY);
+    META_StateAttribute(osg, ShaderStorageBufferBinding, SHADERSTORAGEBUFFERBINDING);
+
+    virtual int compare(const StateAttribute& bb) const
+    {
+        COMPARE_StateAttribute_Types(ShaderStorageBufferBinding, bb)
+        COMPARE_StateAttribute_Parameter(_target)
+        COMPARE_StateAttribute_Parameter(_index)
+        COMPARE_StateAttribute_Parameter(_bufferObject)
+        COMPARE_StateAttribute_Parameter(_offset)
+        COMPARE_StateAttribute_Parameter(_size)
+        return 0;
+    }
+};
+
+
+
+
 } // namespace osg
 
 #endif

include/osg/BufferObject

@@ -732,6 +732,7 @@ class OSG_EXPORT PixelDataBufferObject : public BufferObject
 
 };
 
+
 class OSG_EXPORT UniformBufferObject : public BufferObject
 {
  public:
@@ -759,6 +760,20 @@ inline void GLBufferObject::bindBuffer()
     if (_set) _set->moveToBack(this);
 }
 
+
+class OSG_EXPORT ShaderStorageBufferObject : public BufferObject
+{
+ public:
+
+    ShaderStorageBufferObject();
+    ShaderStorageBufferObject(const ShaderStorageBufferObject& ubo, const CopyOp& copyop=CopyOp::SHALLOW_COPY);
+    META_Object(osg, ShaderStorageBufferObject);
+ protected:
+    virtual ~ShaderStorageBufferObject();
+};
+
+
+
 }
 
 #endif

include/osg/StateAttribute

@@ -199,6 +199,8 @@ class OSG_EXPORT StateAttribute : public Object
 
             VERTEX_ATTRIB_DIVISOR,
 
+            SHADERSTORAGEBUFFERBINDING,
+
             CAPABILITY = 100
         };