added texture2D direct loading function

include/ACGL/OpenGL/Data/TextureLoadStore.hh

+/***********************************************************************
+ * Copyright 2011-2012 Computer Graphics Group RWTH Aachen University. *
+ * All rights reserved.                                                *
+ * Distributed under the terms of the MIT License (see LICENSE.TXT).   *
+ **********************************************************************/
+
+#pragma once
+
+/**
+ * Helper function for writing the contents of a Texture object into a file
+ * and loading them from a file.
+ */
+
+#include <ACGL/ACGL.hh>
+#include <ACGL/OpenGL/Data/TextureDataLoadStore.hh>
+#include <ACGL/OpenGL/Objects/Texture.hh>
+
+#include <string>
+
+namespace ACGL{
+namespace OpenGL{
+
+//! loads the texture and creates mip maps
+SharedTexture2D loadTexture2D( const std::string &_filename );
+
+}
+}

src/ACGL/OpenGL/Data/TextureLoadStore.cc

+/***********************************************************************
+ * Copyright 2011-2012 Computer Graphics Group RWTH Aachen University. *
+ * All rights reserved.                                                *
+ * Distributed under the terms of the MIT License (see LICENSE.TXT).   *
+ **********************************************************************/
+
+#include <ACGL/OpenGL/Data/TextureLoadStore.hh>
+
+using namespace ACGL;
+using namespace ACGL::OpenGL;
+using namespace ACGL::Utils;
+
+namespace ACGL{
+namespace OpenGL{
+
+SharedTexture2D loadTexture2D( const std::string &_filename )
+{
+    SharedTexture2D texture = SharedTexture2D( new Texture2D() );
+    SharedTextureData data  = loadTextureData( _filename );
+    if (!data) {
+        ACGL::Utils::error() << "can't create Texture from file " << _filename << " creating small empty texture instead." << std::endl;
+        texture->resize( glm::uvec2(4,4) );
+    } else {
+        texture->setImageData( loadTextureData( _filename ) );
+    }
+    texture->generateMipmaps(); // calculates all remaining mipmap levels
+
+    return texture;
+}
+
+}
+}