Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/Viewport.h

@@ -0,0 +1,69 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2013 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_VIEWPORT_H
+#define IGL_VIEWPORT_H
+
+namespace igl
+{
+  // Simple Viewport class for an opengl context. Handles reshaping and mouse.
+  struct Viewport
+  {
+    int x,y,width,height;
+    // Constructors
+    Viewport(
+      const int x=0, 
+      const int y=0, 
+      const int width=0,
+      const int height=0):
+      x(x),
+      y(y),
+      width(width),
+      height(height)
+    {
+    };
+    virtual ~Viewport(){}
+    void reshape(
+      const int x, 
+      const int y, 
+      const int width,
+      const int height)
+    {
+      this->x = x;
+      this->y = y;
+      this->width = width;
+      this->height = height;
+    };
+    // Given mouse_x,mouse_y on the entire window return mouse_x, mouse_y in
+    // this viewport.
+    //
+    // Inputs:
+    //   my  mouse y-coordinate
+    //   wh  window height
+    // Returns y-coordinate in viewport
+    int mouse_y(const int my,const int wh)
+    {
+      return my - (wh - height - y);
+    }
+    // Inputs:
+    //   mx  mouse x-coordinate
+    // Returns x-coordinate in viewport
+    int mouse_x(const int mx)
+    {
+      return mx - x;
+    }
+    // Returns whether point (mx,my) is in extend of Viewport
+    bool inside(const int mx, const int my) const
+    {
+      return 
+        mx >= x && my >= y && 
+        mx < x+width && my < y+height;
+    }
+  };
+}
+
+#endif