Improve viewer resize function.

Former-commit-id: 64370663c14bc7eb318c606983102f19730acfe2

include/igl/viewer/Viewer.cpp

@@ -154,7 +154,7 @@ static void glfw_window_size(GLFWwindow* window, int width, int height)
   int w = width*highdpi;
   int h = height*highdpi;
 
-  __viewer->resize(w, h);
+  __viewer->resize_callback(w, h);
 
   // TODO: repositioning of the nanogui
 }
@@ -841,6 +841,11 @@ namespace viewer
   }
 
   IGL_INLINE void Viewer::resize(int w,int h)
+  {
+    glfwSetWindowSize(window, w/highdpi, h/highdpi);
+  }
+
+  IGL_INLINE void Viewer::resize_callback(int w,int h)
   {
     core.viewport = Eigen::Vector4f(0,0,w,h);
   }
@@ -895,7 +900,11 @@ namespace viewer
     }
     else
     {
-      window = glfwCreateWindow(1280,800,"libigl viewer",nullptr,nullptr);
+      if (core.viewport.tail<2>().any()) {
+        window = glfwCreateWindow(core.viewport(2),core.viewport(3),"libigl viewer",nullptr,nullptr);
+      } else {
+        window = glfwCreateWindow(1280,800,"libigl viewer",nullptr,nullptr);
+      }
     }
 
     if (!window)

include/igl/viewer/Viewer.h

@@ -119,7 +119,8 @@ namespace viewer
     IGL_INLINE void draw();
 
     // OpenGL context resize
-    IGL_INLINE void resize(int w,int h);
+    IGL_INLINE void resize(int w,int h); // explicitly set window size
+    IGL_INLINE void resize_callback(int w,int h); // external resize due to user interaction
 
     // Helper functions
     IGL_INLINE void snap_to_canonical_quaternion();

python/tutorial/shared.py

@@ -1,8 +1,8 @@
 import pyigl as igl
 import sys
+import os
 
-
-TUTORIAL_SHARED_PATH = "../../tutorial/shared/"
+TUTORIAL_SHARED_PATH = os.path.join(os.path.dirname(os.path.realpath(__file__)), "../../tutorial/shared/")
 
 def check_dependencies(deps):
     available = [hasattr(igl, m) for m in deps]