Add Window::activateContext().

include/window/Window.hpp

@@ -71,6 +71,7 @@ struct Window {
 	void setSize(math::Vec size);
 	void run();
 	void step();
+	void activateContext();
 	/** Takes a screenshot of the screen and saves it to a PNG file. */
 	void screenshot(const std::string& screenshotPath);
 	/** Saves a PNG image of all modules to `screenshotsDir/<plugin slug>/<module slug>.png`.

src/window/Window.cpp

@@ -517,6 +517,11 @@ void Window::step() {
 }
 
 
+void Window::activateContext() {
+	glfwMakeContextCurrent(win);
+}
+
+
 static void flipBitmap(uint8_t* pixels, int width, int height, int depth) {
 	for (int y = 0; y < height / 2; y++) {
 		int flipY = height - y - 1;