Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/png/texture_from_png.h

@@ -0,0 +1,54 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+//
+// Copyright (C) 2014 Alec Jacobson <alecjacobson@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can
+// obtain one at http://mozilla.org/MPL/2.0/.
+#ifndef IGL_PNG_TEXTURE_FROM_PNG_H
+#define IGL_PNG_TEXTURE_FROM_PNG_H
+#include "../igl_inline.h"
+#include <Eigen/Core>
+#include <string>
+
+#include "../opengl/gl.h"
+
+namespace igl
+{
+  namespace png
+  {
+    // Read an image from a .png file and use it as a texture
+    //
+    // Input:
+    //  png_file  path to .png file
+    //  flip  whether to flip the image vertically (A --> ∀)
+    // Output:
+    //  id  of generated openGL texture
+    // Returns true on success, false on failure
+    IGL_INLINE bool texture_from_png(const std::string png_file, const bool flip, GLuint & id);
+    IGL_INLINE bool texture_from_png(const std::string png_file, GLuint & id);
+
+    // Read an image from a .png file and use it as a texture
+    //
+    // Input:
+    //  png_file  path to .png file
+    // Output:
+    //  R,G,B,A texture channels
+    // Returns true on success, false on failure
+    //
+    // Todo: this is an inappropriate function name. This is really just
+    // reading a png.... Not necessarily as a texture.
+    IGL_INLINE bool texture_from_png(const std::string png_file,
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& R,
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& G,
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& B,
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& A
+    );
+  }
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "texture_from_png.cpp"
+#endif
+
+#endif