From 0f42160ee9b6fa9b0fe7fa650f34fbccc07d87ae Mon Sep 17 00:00:00 2001
From: mmcwilliams <hi@mmcwilliams.com>
Date: Mon, 1 Apr 2024 11:09:59 -0400
Subject: [PATCH] Get screen width and height after fullscreen started

---
 main.cpp | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/main.cpp b/main.cpp
index 3dac895..3d36cf2 100644
--- a/main.cpp
+++ b/main.cpp
@@ -20,9 +20,27 @@ using namespace std;
 
 Mat image;
 GLuint imageTexture;
+GLint screenWidth = 0;
+GLint screenHeight = 0;
  
 void displayMe(void)
 {
+  if (screenWidth == 0 && screenHeight == 0) {
+    GLint dims[4] = {0};
+    glGetIntegerv(GL_VIEWPORT, dims);
+    screenWidth = dims[2];
+    screenHeight = dims[3];
+    cout << screenWidth << "," << screenHeight << endl;
+  }
+
+  string image_path = samples::findFile("chart.png");
+  Mat image = imread(image_path, IMREAD_COLOR);
+  #if (CV_VERSION_MAJOR >= 4)
+    cvtColor(image, image, cv::COLOR_BGR2RGB);
+  #else
+    cvtColor(image, image, CV_BGR2RGB);
+  #endif
+  
   // Set every pixel in the frame buffer to the current clear color.
   glClear(GL_COLOR_BUFFER_BIT);
   glBegin(GL_POLYGON);
@@ -38,23 +56,15 @@ void displayMe(void)
  
 int main(int argc, char** argv)
 {
-    string image_path = samples::findFile("chart.png");
-    Mat image = imread(image_path, IMREAD_COLOR);
-
-#if (CV_VERSION_MAJOR >= 4)
-    cvtColor(image, image, cv::COLOR_BGR2RGB);
-#else
-    cvtColor(image, image, CV_BGR2RGB);
-#endif
  
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_SINGLE);
-    glutInitWindowSize(1920, 1080);
-    glutInitWindowPosition(0, 0);
     glutCreateWindow("opengl_opencv_example");
     glutFullScreen();
-
     glutDisplayFunc(displayMe);
     glutMainLoop();
+
+    
+    
     return 0;
 }
\ No newline at end of file