From Brad Colbert/Robert Osfield: added s/getSourceFormat and s/getSourceType to osg::Texture

along with support for this Texture1D, 2D, 3D, TextureCubeMap and TextureRectangle.  The
new SourceFormat and SourceType parameters are only used when no osg::Image is assigned to
an osg::Texture, and main use is for render to texture effects.

Added support for --hdr option in osgprerender, which utilises the new Texture::setSourceFormat/Type() methods.

src/osg/Texture2D.cpp

@@ -222,8 +222,8 @@ void Texture2D::apply(State& state) const
         // no image present, but dimensions at set so lets create the texture
         glTexImage2D( GL_TEXTURE_2D, 0, _internalFormat,
                      _textureWidth, _textureHeight, _borderWidth,
-                     _internalFormat,
-                     GL_UNSIGNED_BYTE,
+                     _sourceFormat ? _sourceFormat : _internalFormat,
+                     _sourceType ? _sourceType : GL_UNSIGNED_BYTE,
                      0);                
                      
         if (_readPBuffer.valid())