[Fix] add libomp documentation for OSX, fix missing namespaces, fix s…

…creen flicker

README.md

@@ -151,7 +151,7 @@ sudo apt-get install build-essential cmake libglew-dev libglfw3-dev libglm-dev
 On macOS install [Homebrew](http://brew.sh) package manager and install the dependencies using the following commands in terminal. Note that the installation of Homebrew expects __XCode__ to be installed, this can be simply downloaded from the app store.
 
 ```bash
-brew install cmake glm glfw glew
+brew install cmake glm glfw glew libomp
 ```
 
 You can also install CMake and use it to generate project files for your IDE of choice.

src/gl1_gradient/gl1_gradient.cpp

@@ -90,7 +90,7 @@ class GradientWindow : public ppgso::Window {
   /*!
    * Window refresh implementation that will be called automatically from pollEvents when needed
    */
-  void onRefresh() override {
+  void onIdle() override {
     // Set gray background
     glClearColor(.5, .5, .5, 0);
 

src/gl2_texture/gl2_texture.cpp

@@ -31,7 +31,7 @@ class TextureWindow : public ppgso::Window {
    * @param width Width of the image to load
    * @param height Height of the image to load
    */
-  void loadImage(const string &image_file, int width, int height) {
+  void loadImage(const std::string &image_file, int width, int height) {
     // Create new OpenGL texture object identifier
     glGenTextures(1, &texture_id);
     glBindTexture(GL_TEXTURE_2D, texture_id);
@@ -44,7 +44,7 @@ class TextureWindow : public ppgso::Window {
     std::ifstream image_stream(image_file, std::ios::binary);
 
     // Setup buffer for pixels (r,g,b bytes), since we will not manipulate the image just keep it as char
-    vector<char> buffer(static_cast<std::size_t>(width * height * 3));
+    std::vector<char> buffer(static_cast<std::size_t>(width * height * 3));
     image_stream.read(buffer.data(), static_cast<std::streamsize>(buffer.size()));
     image_stream.close();
 
@@ -88,7 +88,7 @@ class TextureWindow : public ppgso::Window {
   /*!
    * Window refresh implementation that will be called automatically from pollEvents when needed
    */
-  void onRefresh() override {
+  void onIdle() override {
     // Set gray background
     glClearColor(.5f, .5f, .5f, 0);