Update Texture.cpp

src/types/Texture.cpp

@@ -28,6 +28,22 @@ invert_y(invert_y), filtering_mode(filtering_mode), wrapping_mode(wrapping_mode)
         pixels = png(file);
     ifStream.close();
 
+
+    if (invert_y) {
+        unsigned int row_size = size.x * 4;;
+        if (format == ColorFormat::RGB)
+            row_size = size.x * 3;
+
+        std::vector<unsigned char> temp(row_size);
+        for (unsigned int y = 0; y < size.y / 2; ++y) {
+            unsigned char *topRow = &pixels[y * row_size];
+            unsigned char *bottomRow = &pixels[(size.y - y - 1) * row_size];
+            std::copy(bottomRow, bottomRow + row_size, temp.begin());
+            std::copy(topRow, topRow + row_size, bottomRow);
+            std::copy(temp.begin(), temp.end(), topRow);
+        }
+    }
+
     load(pixels.data());
 }