diff --git a/main.cpp b/main.cpp
index fbd2a20..3ee25ed 100644
--- a/main.cpp
+++ b/main.cpp
@@ -20,7 +20,6 @@ using namespace std;
 using namespace std::chrono;
 using time_stamp = time_point<system_clock, microseconds>;
 
-Mat image;
 GLuint imageTexture;
 GLint screenWidth = 0;
 GLint screenHeight = 0;
@@ -29,25 +28,27 @@ time_stamp ts;
 void loadTexture (GLuint& imageTexture1)
 {
   string image_path = samples::findFile("chart.png");
-  Mat image = imread(image_path, IMREAD_COLOR);
+  Mat loaded = imread(image_path, IMREAD_COLOR);
+  Mat image = Mat::zeros(screenWidth, screenHeight, CV_8UC3);
+  cout << "created image" << endl;
   if (image.empty()) {
       cout << "image empty" << endl;
   } else {
       cout << "loaded " << image_path << endl;
-      flip(image, image, 0);
+      cout << "   dim " << loaded.cols << "x" << loaded.rows << endl;
+      loaded.copyTo(image(Rect(0, 0, loaded.cols, loaded.rows)));
+      //flip(image, image, 0);
 #if (CV_VERSION_MAJOR >= 4)
       cvtColor(image, image, cv::COLOR_BGR2RGB);
 #else
       cvtColor(image, image, CV_BGR2RGB);
 #endif
-      //glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
       glGenTextures(1, &imageTexture1);
       glBindTexture(GL_TEXTURE_2D, imageTexture1);
 
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
-        // Set texture clamping method
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
 
@@ -60,6 +61,7 @@ void loadTexture (GLuint& imageTexture1)
                         GL_RGB,              // Input image format (i.e. GL_RGB, GL_RGBA, GL_BGR etc.)
                         GL_UNSIGNED_BYTE,    // Image data type
                         image.ptr());        // The actual image data itself
+    cout << "display()" << endl;
     }
 }
 
@@ -71,18 +73,18 @@ void getScreenDimensions ()
     screenWidth = dims[2];
     screenHeight = dims[3];
     cout << screenWidth << "," << screenHeight << endl;
-    loadTexture(imageTexture);
   }
 }
  
 void display(void)
 {
   getScreenDimensions();
+  loadTexture(imageTexture);
   ts = time_point_cast<microseconds>(system_clock::now());
   
   glClear(GL_COLOR_BUFFER_BIT);
   glEnable(GL_TEXTURE_2D);
-  //glViewport(0, 0, screenWidth, screenHeight);
+  glViewport(0, 0, screenWidth, screenHeight);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   
@@ -102,6 +104,16 @@ void display(void)
  
 int main(int argc, char** argv)
 {
+    if (argc > 1)
+    {
+        screenWidth = atoi(argv[1]);
+        cout << "Set width: " << screenWidth << endl;
+    }
+    if (argc > 2)
+    {
+        screenHeight = atoi(argv[2]);
+        cout << "Set height: " << screenHeight << endl;
+    }
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_SINGLE);
     glutCreateWindow("opengl_opencv_example");