Allow resize of gl window?

All current cimbar configs share the same dimensions, but that might be
changing

src/lib/cimbar_js/cimbar_js.cpp

@@ -29,17 +29,17 @@ extern "C" {
 
 int initialize_GL(int width, int height)
 {
-	if (_window)
-		return 1;
-
 	// must be divisible by 4???
 	if (width % 4 != 0)
 		width += (4 - width % 4);
 	if (height % 4 != 0)
 		height += (4 - height % 4);
 	std::cerr << "initializing " << width << " by " << height << " window";
 
-	_window = std::make_shared<cimbar::window_glfw>(width, height, "Cimbar Encoder");
+	if (_window and _window->is_good())
+		_window->resize(width, height);
+	else
+		_window = std::make_shared<cimbar::window_glfw>(width, height, "Cimbar Encoder");
 	if (!_window or !_window->is_good())
 		return 0;
 

src/lib/gui/gl_2d_display.h

@@ -44,9 +44,9 @@ class gl_2d_display
 	}
 
 public:
-	gl_2d_display(unsigned width, unsigned height)
+	gl_2d_display(float dim)
 	    : _p(create())
-	    , _shakePos(computeShakePos(std::min(width, height)))
+	    , _shakePos(computeShakePos(dim))
 	    , _shake(_shakePos)
 	    , _rotation(ROTATIONS)
 	{

src/lib/gui/window_glfw.h

@@ -33,15 +33,18 @@ class window_glfw
 		glfwMakeContextCurrent(_w);
 		glfwSwapInterval(1);
 
-		_display = std::make_shared<cimbar::gl_2d_display>(width, height);
+		_display = std::make_shared<cimbar::gl_2d_display>(std::min(width, height));
 		glGenTextures(1, &_texid);
 		init_opengl(width, height);
 	}
 
 	~window_glfw()
 	{
 		if (_w)
+		{
 			glfwDestroyWindow(_w);
+			_w = nullptr;
+		}
 		if (_texid)
 			glDeleteTextures(1, &_texid);
 		glfwTerminate();
@@ -65,6 +68,12 @@ class window_glfw
 		glfwSetWindowSizeCallback(_w, fun);
 	}
 
+	void resize(unsigned width, unsigned height)
+	{
+		if (_w)
+			glfwSetWindowSize(_w, width, height);
+	}
+
 	void rotate(unsigned i=1)
 	{
 		if (_display)
@@ -133,7 +142,7 @@ class window_glfw
 	}
 
 protected:
-	GLFWwindow* _w;
+	GLFWwindow* _w = nullptr;
 	GLuint _texid;
 	std::shared_ptr<cimbar::gl_2d_display> _display;
 	unsigned _width;