add video rendering in Screen

Shooter.cpp

@@ -156,6 +156,13 @@ void Shooter::update() {
         setDebugInfo(!showDebugInfo());
     }
 
+    if (keyboard->isKeyTapped(sf::Keyboard::P)) {
+        screen->startRender();
+    }
+    if (keyboard->isKeyTapped(sf::Keyboard::L)) {
+        screen->stopRender();
+    }
+
     if (inGame) {
         screen->setTitle(ShooterConsts::PROJECT_NAME);
         playerController->update();

Source.cpp

@@ -10,8 +10,8 @@ using namespace std;
 int main() {
     Shooter game;
 
-    game.create(1280, 720, ShooterConsts::PROJECT_NAME, true);
+    //game.create(1280, 720, ShooterConsts::PROJECT_NAME, true);
-    //game.create(1920, 1080, ShooterConsts::PROJECT_NAME, true, Consts::BACKGROUND_COLOR, sf::Style::Fullscreen);
+    game.create(1920, 1080, ShooterConsts::PROJECT_NAME, true, Consts::BACKGROUND_COLOR, sf::Style::None);
 
     //game.create(2048, 1152, ShooterConsts::PROJECT_NAME, false);
     //game.create(3072, 1920, ShooterConsts::PROJECT_NAME, true, Consts::BACKGROUND_COLOR, sf::Style::Fullscreen);

engine/Screen.cpp

@@ -36,9 +36,40 @@ void Screen::display() {
     std::string title = _title + " (" + std::to_string(Time::fps()) + " fps)";
     _window->setTitle(title);
 
+    if(_renderVideo) {
+        sf::Texture copyTexture;
+        copyTexture.create(_window->getSize().x, _window->getSize().y);
+        copyTexture.update(*_window);
+        // most of the time of video rendering is wasting on .png sequence saving
+        // that's why we will save all images in the end
+        // TODO: sometimes we have a huge time delay here for no obvious reason
+        _renderSequence.push_back(copyTexture);
+    }
+
     _window->display();
 }
 
+void Screen::startRender() {
+    stopRender();
+    _renderVideo = true;
+}
+
+void Screen::stopRender() {
+    if(_renderVideo) {
+
+        int i = 0;
+        for(; i < _renderSequence.size(); i++) {
+            _renderSequence[i].copyToImage().saveToFile("film/png/" + std::to_string(i) + ".png");
+        }
+        _renderSequence.clear();
+
+        std::string c = "ffmpeg -stats -r 60 -i film/png/%d.png -vcodec libx264 -crf 1 -pix_fmt yuv420p -frames " + std::to_string(i) + " film/mp4/" + std::to_string(_scene) + "_" + _title + ".mp4";
+        popen(c.c_str(), "w");
+        _scene++;
+        _renderVideo = false;
+    }
+}
+
 void Screen::clear() {
     // Clear the depth buffer
     glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);

engine/Screen.h

@@ -19,6 +19,10 @@
 
 class Screen final {
 private:
+    int _scene = 0;
+    bool _renderVideo = false;
+    std::vector<sf::Texture> _renderSequence;
+
     std::string _title;
 
     sf::Color _background;
@@ -68,6 +72,9 @@ public:
 
     void pushGLStates() { _window->pushGLStates(); };
     void popGLStates() { _window->popGLStates(); };
+
+    void startRender();
+    void stopRender();
 };